mcs/gmcs/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 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10 // (C) 2004 Novell, Inc
  11 //
  12 // TODO: Move the method verification stuff from the class.cs and interface.cs here
  13 //
  14
  15 using System;
  16 using System.Text;
  17 using System.Collections;
  18 using System.Globalization;
  19 using System.Reflection.Emit;
  20 using System.Reflection;
  21 using System.Xml;
  22
  23 namespace Mono.CSharp {
  24
  25         public class MemberName {
  26                 public readonly string Name;
  27                 public readonly TypeArguments TypeArguments;
  28
  29                 public readonly MemberName Left;
  30
  31                 public static readonly MemberName Null = new MemberName ("");
  32
  33                 public MemberName (string name)
  34                 {
  35                         this.Name = name;
  36                 }
  37
  38                 public MemberName (string name, TypeArguments args)
  39                         : this (name)
  40                 {
  41                         this.TypeArguments = args;
  42                 }
  43
  44                 public MemberName (MemberName left, string name)
  45                         : this (left, name, null)
  46                 {
  47                 }
  48
  49                 public MemberName (MemberName left, string name, TypeArguments args)
  50                         : this (name, args)
  51                 {
  52                         this.Left = left;
  53                 }
  54
  55                 public MemberName (MemberName left, MemberName right)
  56                         : this (left, right.Name, right.TypeArguments)
  57                 {
  58                         Name = right.Name;
  59                         Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  60                         TypeArguments = right.TypeArguments;
  61                 }
  62
  63                 static readonly char [] dot_array = { '.' };
  64
  65                 public static MemberName FromDotted (string name)
  66                 {
  67                         string [] elements = name.Split (dot_array);
  68                         int count = elements.Length;
  69                         int i = 0;
  70                         MemberName n = new MemberName (elements [i++]);
  71                         while (i < count)
  72                                 n = new MemberName (n, elements [i++]);
  73                         return n;
  74                 }
  75
  76                 public string GetName ()
  77                 {
  78                         if (Left != null)
  79                                 return Left.GetName () + "." + Name;
  80                         else
  81                                 return Name;
  82                 }
  83
  84                 public bool IsGeneric {
  85                         get {
  86                                 if (TypeArguments != null)
  87                                         return true;
  88                                 else if (Left != null)
  89                                         return Left.IsGeneric;
  90                                 else
  91                                         return false;
  92                         }
  93                 }
  94
  95                 public string GetName (bool is_generic)
  96                 {
  97                         string name = is_generic ? Basename : Name;
  98                         if (Left != null)
  99                                 return Left.GetName (is_generic) + "." + name;
 100                         else
 101                                 return name;
 102                 }
 103
 104                 public int CountTypeArguments {
 105                         get {
 106                                 if (TypeArguments == null)
 107                                         return 0;
 108                                 else
 109                                         return TypeArguments.Count;
 110                         }
 111                 }
 112
 113                 public string MethodName {
 114                         get {
 115                                 if (Left != null)
 116                                         return Left.FullName + "." + Name;
 117                                 else
 118                                         return Name;
 119                         }
 120                 }
 121
 122                 public static string MakeName (string name, TypeArguments args)
 123                 {
 124                         if (args == null)
 125                                 return name;
 126                         else
 127                                 return name + "`" + args.Count;
 128                 }
 129
 130                 public static string MakeName (string name, int count)
 131                 {
 132                         return name + "`" + count;
 133                 }
 134
 135                 public string GetTypeName ()
 136                 {
 137                         if (Left != null)
 138                                 return Left.GetTypeName () + "." +
 139                                         MakeName (Name, TypeArguments);
 140                         else
 141                                 return MakeName (Name, TypeArguments);
 142                 }
 143
 144                 protected bool IsUnbound {
 145                         get {
 146                                 if ((Left != null) && Left.IsUnbound)
 147                                         return true;
 148                                 else if (TypeArguments == null)
 149                                         return false;
 150                                 else
 151                                         return TypeArguments.IsUnbound;
 152                         }
 153                 }
 154
 155                 protected bool CheckUnbound (Location loc)
 156                 {
 157                         if ((Left != null) && !Left.CheckUnbound (loc))
 158                                 return false;
 159                         if ((TypeArguments != null) && !TypeArguments.IsUnbound) {
 160                                 Report.Error (1031, loc, "Type expected");
 161                                 return false;
 162                         }
 163
 164                         return true;
 165                 }
 166
 167                 public Expression GetTypeExpression (Location loc)
 168                 {
 169                         if (IsUnbound) {
 170                                 if (!CheckUnbound (loc))
 171                                         return null;
 172
 173                                 return new UnboundTypeExpression (GetTypeName ());
 174                         }
 175
 176                         if (Left != null) {
 177                                 Expression lexpr = Left.GetTypeExpression (loc);
 178
 179                                 return new MemberAccess (lexpr, Name, TypeArguments, loc);
 180                         } else {
 181                                 if (TypeArguments != null)
 182                                         return new SimpleName (Basename, TypeArguments, loc);
 183                                 else
 184                                         return new SimpleName (Name, loc);
 185                         }
 186                 }
 187
 188                 public MemberName Clone ()
 189                 {
 190                         if (Left != null)
 191                                 return new MemberName (Left.Clone (), Name, TypeArguments);
 192                         else
 193                                 return new MemberName (Name, TypeArguments);
 194                 }
 195
 196                 public string Basename {
 197                         get {
 198                                 if (TypeArguments != null)
 199                                         return MakeName (Name, TypeArguments);
 200                                 else
 201                                         return Name;
 202                         }
 203                 }
 204
 205                 public string FullName {
 206                         get {
 207                                 if (TypeArguments != null)
 208                                         return Name + "<" + TypeArguments + ">";
 209                                 else
 210                                         return Name;
 211                         }
 212                 }
 213
 214                 public override string ToString ()
 215                 {
 216                         if (Left != null)
 217                                 return Left.FullName + "." + FullName;
 218                         else
 219                                 return FullName;
 220                 }
 221
 222                 public override bool Equals (object other)
 223                 {
 224                         return Equals (other as MemberName);
 225                 }
 226
 227                 public bool Equals (MemberName other)
 228                 {
 229                         if (this == other)
 230                                 return true;
 231                         if (other == null || Name != other.Name)
 232                                 return false;
 233
 234                         if ((TypeArguments != null) &&
 235                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 236                                 return false;
 237
 238                         if ((TypeArguments == null) && (other.TypeArguments != null))
 239                                 return false;
 240
 241                         if (Left == null)
 242                                 return other.Left == null;
 243
 244                         return Left.Equals (other.Left);
 245                 }
 246
 247                 public override int GetHashCode ()
 248                 {
 249                         int hash = Name.GetHashCode ();
 250                         for (MemberName n = Left; n != null; n = n.Left)
 251                                 hash ^= n.Name.GetHashCode ();
 252
 253                         if (TypeArguments != null)
 254                                 hash ^= TypeArguments.Count << 5;
 255
 256                         return hash & 0x7FFFFFFF;
 257                 }
 258         }
 259
 260         /// <summary>
 261         ///   Base representation for members.  This is used to keep track
 262         ///   of Name, Location and Modifier flags, and handling Attributes.
 263         /// </summary>
 264         public abstract class MemberCore : Attributable {
 265                 /// <summary>
 266                 ///   Public name
 267                 /// </summary>
 268
 269                 protected string cached_name;
 270                 public string Name {
 271                         get {
 272                                 if (cached_name == null)
 273                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 274                                 return cached_name;
 275                         }
 276                 }
 277
 278                 // Is not readonly because of IndexerName attribute
 279                 private MemberName member_name;
 280                 public MemberName MemberName {
 281                         get { return member_name; }
 282                 }
 283
 284                 /// <summary>
 285                 ///   Modifier flags that the user specified in the source code
 286                 /// </summary>
 287                 public int ModFlags;
 288
 289                 public /*readonly*/ TypeContainer Parent;
 290
 291                 /// <summary>
 292                 ///   Location where this declaration happens
 293                 /// </summary>
 294                 public readonly Location Location;
 295
 296                 /// <summary>
 297                 ///   XML documentation comment
 298                 /// </summary>
 299                 public string DocComment;
 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                         TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
 320                         IsUsed = 1 << 11
 321                 }
 322
 323                 /// <summary>
 324                 ///   MemberCore flags at first detected then cached
 325                 /// </summary>
 326                 internal Flags caching_flags;
 327
 328                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs,
 329                                    Location loc)
 330                         : base (attrs)
 331                 {
 332                         if (parent is PartialContainer && !(this is PartialContainer))
 333                                 throw new InternalErrorException ("A PartialContainer cannot be the direct parent of a member");
 334
 335                         Parent = parent;
 336                         member_name = name;
 337                         Location = loc;
 338                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 339                 }
 340
 341                 protected virtual void SetMemberName (MemberName new_name)
 342                 {
 343                         member_name = new_name;
 344                         cached_name = null;
 345                 }
 346
 347                 /// <summary>
 348                 /// Tests presence of ObsoleteAttribute and report proper error
 349                 /// </summary>
 350                 protected void CheckUsageOfObsoleteAttribute (Type type)
 351                 {
 352                         if (type == null)
 353                                 return;
 354
 355                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
 356                         if (obsolete_attr == null)
 357                                 return;
 358
 359                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
 360                 }
 361
 362                 public abstract bool Define ();
 363
 364                 //
 365                 // Returns full member name for error message
 366                 //
 367                 public virtual string GetSignatureForError ()
 368                 {
 369                         return Name;
 370                 }
 371
 372                 /// <summary>
 373                 /// Use this method when MethodBuilder is null
 374                 /// </summary>
 375                 public virtual string GetSignatureForError (TypeContainer tc)
 376                 {
 377                         return Name;
 378                 }
 379
 380                 /// <summary>
 381                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 382                 /// </summary>
 383                 public virtual void Emit ()
 384                 {
 385                         // Hack with Parent == null is for EnumMember
 386                         if (Parent == null || (GetObsoleteAttribute (Parent) == null && Parent.GetObsoleteAttribute (Parent) == null))
 387                                 VerifyObsoleteAttribute ();
 388
 389                         if (!RootContext.VerifyClsCompliance)
 390                                 return;
 391
 392                         VerifyClsCompliance (Parent);
 393                 }
 394
 395                 public bool InUnsafe {
 396                         get {
 397                                 return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
 398                         }
 399                 }
 400
 401                 public virtual bool IsUsed {
 402                         get {
 403                                 return (caching_flags & Flags.IsUsed) != 0;
 404                         }
 405                 }
 406
 407                 public void SetMemberIsUsed ()
 408                 {
 409                         caching_flags |= Flags.IsUsed;
 410                 }
 411
 412                 //
 413                 // Whehter is it ok to use an unsafe pointer in this type container
 414                 //
 415                 public bool UnsafeOK (DeclSpace parent)
 416                 {
 417                         //
 418                         // First check if this MemberCore modifier flags has unsafe set
 419                         //
 420                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 421                                 return true;
 422
 423                         if (parent.UnsafeContext)
 424                                 return true;
 425
 426                         Expression.UnsafeError (Location);
 427                         return false;
 428                 }
 429
 430                 /// <summary>
 431                 /// Returns instance of ObsoleteAttribute for this MemberCore
 432                 /// </summary>
 433                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 434                 {
 435                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 436                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 437                                 return null;
 438                         }
 439
 440                         caching_flags &= ~Flags.Obsolete_Undetected;
 441
 442                         if (OptAttributes == null)
 443                                 return null;
 444
 445                         Attribute obsolete_attr = OptAttributes.Search (
 446                                 TypeManager.obsolete_attribute_type, ds.EmitContext);
 447                         if (obsolete_attr == null)
 448                                 return null;
 449
 450                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds.EmitContext);
 451                         if (obsolete == null)
 452                                 return null;
 453
 454                         caching_flags |= Flags.Obsolete;
 455                         return obsolete;
 456                 }
 457
 458                 /// <summary>
 459                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 460                 /// </summary>
 461                 public override bool IsClsComplianceRequired (DeclSpace container)
 462                 {
 463                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 464                                 return (caching_flags & Flags.ClsCompliant) != 0;
 465
 466                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 467                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 468                                 caching_flags |= Flags.ClsCompliant;
 469                                 return true;
 470                         }
 471
 472                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 473                         return false;
 474                 }
 475
 476                 /// <summary>
 477                 /// Returns true when MemberCore is exposed from assembly.
 478                 /// </summary>
 479                 public bool IsExposedFromAssembly (DeclSpace ds)
 480                 {
 481                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 482                                 return false;
 483
 484                         DeclSpace parentContainer = ds;
 485                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 486                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 487                                         return false;
 488                                 parentContainer = parentContainer.Parent;
 489                         }
 490                         return true;
 491                 }
 492
 493                 /// <summary>
 494                 /// Resolve CLSCompliantAttribute value or gets cached value.
 495                 /// </summary>
 496                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 497                 {
 498                         if (OptAttributes != null) {
 499                                 Attribute cls_attribute = OptAttributes.Search (
 500                                         TypeManager.cls_compliant_attribute_type, ds.EmitContext);
 501                                 if (cls_attribute != null) {
 502                                         caching_flags |= Flags.HasClsCompliantAttribute;
 503                                         return cls_attribute.GetClsCompliantAttributeValue (ds.EmitContext);
 504                                 }
 505                         }
 506                         return ds.GetClsCompliantAttributeValue ();
 507                 }
 508
 509                 /// <summary>
 510                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 511                 /// </summary>
 512                 protected bool HasClsCompliantAttribute {
 513                         get {
 514                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 515                         }
 516                 }
 517
 518                 /// <summary>
 519                 /// It helps to handle error 102 & 111 detection
 520                 /// </summary>
 521                 public virtual bool MarkForDuplicationCheck ()
 522                 {
 523                         return false;
 524                 }
 525
 526                 /// <summary>
 527                 /// The main virtual method for CLS-Compliant verifications.
 528                 /// The method returns true if member is CLS-Compliant and false if member is not
 529                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 530                 /// and add their extra verifications.
 531                 /// </summary>
 532                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 533                 {
 534                         if (!IsClsComplianceRequired (ds)) {
 535                                 if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
 536                                         if (!IsExposedFromAssembly (ds))
 537                                                 Report.Warning (3019, Location, "CLS compliance checking will not be performed on '{0}' because it is private or internal", GetSignatureForError ());
 538                                         if (!CodeGen.Assembly.IsClsCompliant)
 539                                                 Report.Warning (3021, Location, "'{0}' does not need a CLSCompliant attribute because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 540                                 }
 541                                 return false;
 542                         }
 543
 544                         if (!CodeGen.Assembly.IsClsCompliant) {
 545                                 if (HasClsCompliantAttribute) {
 546                                         Report.Error (3014, Location, "'{0}' cannot be marked as CLS-compliant because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 547                                 }
 548                                 return false;
 549                         }
 550
 551                         int index = Name.LastIndexOf ('.');
 552                         if (Name [index > 0 ? index + 1 : 0] == '_') {
 553                                 Report.Error (3008, Location, "Identifier '{0}' is not CLS-compliant", GetSignatureForError () );
 554                         }
 555                         return true;
 556                 }
 557
 558                 protected abstract void VerifyObsoleteAttribute ();
 559
 560                 //
 561                 // Raised (and passed an XmlElement that contains the comment)
 562                 // when GenerateDocComment is writing documentation expectedly.
 563                 //
 564                 internal virtual void OnGenerateDocComment (DeclSpace ds, XmlElement intermediateNode)
 565                 {
 566                 }
 567
 568                 //
 569                 // Returns a string that represents the signature for this
 570                 // member which should be used in XML documentation.
 571                 //
 572                 public virtual string GetDocCommentName (DeclSpace ds)
 573                 {
 574                         if (ds == null || this is DeclSpace)
 575                                 return DocCommentHeader + Name;
 576                         else
 577                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 578                 }
 579
 580                 //
 581                 // Generates xml doc comments (if any), and if required,
 582                 // handle warning report.
 583                 //
 584                 internal virtual void GenerateDocComment (DeclSpace ds)
 585                 {
 586                         DocUtil.GenerateDocComment (this, ds);
 587                 }
 588         }
 589
 590         /// <summary>
 591         ///   Base class for structs, classes, enumerations and interfaces.
 592         /// </summary>
 593         /// <remarks>
 594         ///   They all create new declaration spaces.  This
 595         ///   provides the common foundation for managing those name
 596         ///   spaces.
 597         /// </remarks>
 598         public abstract class DeclSpace : MemberCore, IAlias {
 599                 /// <summary>
 600                 ///   This points to the actual definition that is being
 601                 ///   created with System.Reflection.Emit
 602                 /// </summary>
 603                 public TypeBuilder TypeBuilder;
 604
 605                 /// <summary>
 606                 ///   If we are a generic type, this is the type we are
 607                 ///   currently defining.  We need to lookup members on this
 608                 ///   instead of the TypeBuilder.
 609                 /// </summary>
 610                 public Type CurrentType;
 611
 612                 //
 613                 // This is the namespace in which this typecontainer
 614                 // was declared.  We use this to resolve names.
 615                 //
 616                 public NamespaceEntry NamespaceEntry;
 617
 618                 private Hashtable Cache = new Hashtable ();
 619
 620                 public readonly string Basename;
 621
 622                 protected Hashtable defined_names;
 623
 624                 readonly bool is_generic;
 625                 readonly int count_type_params;
 626                 readonly int count_current_type_params;
 627
 628                 // The emit context for toplevel objects.
 629                 protected EmitContext ec;
 630
 631                 public EmitContext EmitContext {
 632                         get { return ec; }
 633                 }
 634
 635                 //
 636                 // Whether we are Generic
 637                 //
 638                 public bool IsGeneric {
 639                         get {
 640                                 if (is_generic)
 641                                         return true;
 642                                 else if (Parent != null)
 643                                         return Parent.IsGeneric;
 644                                 else
 645                                         return false;
 646                         }
 647                 }
 648
 649                 static string[] attribute_targets = new string [] { "type" };
 650
 651                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 652                                   Attributes attrs, Location l)
 653                         : base (parent, name, attrs, l)
 654                 {
 655                         NamespaceEntry = ns;
 656                         Basename = name.Basename;
 657                         defined_names = new Hashtable ();
 658                         if (name.TypeArguments != null) {
 659                                 is_generic = true;
 660                                 count_type_params = count_current_type_params = name.TypeArguments.Count;
 661                         }
 662                         if (parent != null)
 663                                 count_type_params += parent.count_type_params;
 664                 }
 665
 666                 /// <summary>
 667                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 668                 /// </summary>
 669                 protected bool AddToContainer (MemberCore symbol, string name)
 670                 {
 671                         if (name == Basename && !(this is Interface) && !(this is Enum)) {
 672                                 if (symbol is TypeParameter)
 673                                         Report.Error (694, "Type parameter `{0}' has same name as " +
 674                                                       "containing type or method", name);
 675                                 else {
 676                                         Report.SymbolRelatedToPreviousError (this);
 677                                         Report.Error (542, "'{0}': member names cannot be the same as their " +
 678                                                       "enclosing type", symbol.Location, symbol.GetSignatureForError ());
 679                                 }
 680                                 return false;
 681                         }
 682
 683                         MemberCore mc = (MemberCore) defined_names [name];
 684
 685                         if (mc == null) {
 686                                 defined_names.Add (name, symbol);
 687                                 return true;
 688                         }
 689
 690                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 691                                 return true;
 692
 693                         if (symbol is TypeParameter)
 694                                 Report.Error (692, symbol.Location, "Duplicate type parameter `{0}'", name);
 695                         else {
 696                                 Report.SymbolRelatedToPreviousError (mc);
 697                                 Report.Error (102, symbol.Location,
 698                                               "The type '{0}' already contains a definition for '{1}'",
 699                                               GetSignatureForError (), name);
 700                         }
 701                         return false;
 702                 }
 703
 704                 public void RecordDecl ()
 705                 {
 706                         if ((NamespaceEntry != null) && (Parent == RootContext.Tree.Types))
 707                                 NamespaceEntry.DefineName (MemberName.Basename, this);
 708                 }
 709
 710                 /// <summary>
 711                 ///   Returns the MemberCore associated with a given name in the declaration
 712                 ///   space. It doesn't return method based symbols !!
 713                 /// </summary>
 714                 ///
 715                 public MemberCore GetDefinition (string name)
 716                 {
 717                         return (MemberCore)defined_names [name];
 718                 }
 719
 720                 //
 721                 // root_types contains all the types.  All TopLevel types
 722                 // hence have a parent that points to `root_types', that is
 723                 // why there is a non-obvious test down here.
 724                 //
 725                 public bool IsTopLevel {
 726                         get {
 727                                 if (Parent != null){
 728                                         if (Parent.Parent == null)
 729                                                 return true;
 730                                 }
 731                                 return false;
 732                         }
 733                 }
 734
 735                 public virtual void CloseType ()
 736                 {
 737                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 738                                 try {
 739                                         TypeBuilder.CreateType ();
 740                                 } catch {
 741                                         //
 742                                         // The try/catch is needed because
 743                                         // nested enumerations fail to load when they
 744                                         // are defined.
 745                                         //
 746                                         // Even if this is the right order (enumerations
 747                                         // declared after types).
 748                                         //
 749                                         // Note that this still creates the type and
 750                                         // it is possible to save it
 751                                 }
 752                                 caching_flags |= Flags.CloseTypeCreated;
 753                         }
 754                 }
 755
 756                 protected virtual TypeAttributes TypeAttr {
 757                         get {
 758                                 return CodeGen.Module.DefaultCharSetType;
 759                         }
 760                 }
 761
 762                 /// <remarks>
 763                 ///  Should be overriten by the appropriate declaration space
 764                 /// </remarks>
 765                 public abstract TypeBuilder DefineType ();
 766
 767                 /// <summary>
 768                 ///   Define all members, but don't apply any attributes or do anything which may
 769                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 770                 /// </summary>
 771                 public abstract bool DefineMembers (TypeContainer parent);
 772
 773                 //
 774                 // Whether this is an `unsafe context'
 775                 //
 776                 public bool UnsafeContext {
 777                         get {
 778                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 779                                         return true;
 780                                 if (Parent != null)
 781                                         return Parent.UnsafeContext;
 782                                 return false;
 783                         }
 784                 }
 785
 786                 EmitContext type_resolve_ec;
 787                 protected EmitContext TypeResolveEmitContext {
 788                         get {
 789                                 if (type_resolve_ec == null) {
 790                                         // FIXME: I think this should really be one of:
 791                                         //
 792                                         // a. type_resolve_ec = Parent.EmitContext;
 793                                         // b. type_resolve_ec = new EmitContext (Parent, Parent, loc, null, null, ModFlags, false);
 794                                         //
 795                                         // However, if Parent == RootContext.Tree.Types, its NamespaceEntry will be null.
 796                                         //
 797                                         type_resolve_ec = new EmitContext (Parent, this, Location.Null, null, null, ModFlags, false);
 798                                 }
 799                                 return type_resolve_ec;
 800                         }
 801                 }
 802
 803                 // <summary>
 804                 //    Resolves the expression `e' for a type, and will recursively define
 805                 //    types.  This should only be used for resolving base types.
 806                 // </summary>
 807                 public TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
 808                 {
 809                         TypeResolveEmitContext.loc = loc;
 810                         TypeResolveEmitContext.ContainerType = TypeBuilder;
 811                         if (this is GenericMethod)
 812                                 TypeResolveEmitContext.ContainerType = Parent.TypeBuilder;
 813                         else
 814                                 TypeResolveEmitContext.ContainerType = TypeBuilder;
 815
 816                         return e.ResolveAsTypeTerminal (TypeResolveEmitContext);
 817                 }
 818
 819                 public bool CheckAccessLevel (Type check_type)
 820                 {
 821                         TypeBuilder tb;
 822                         if ((this is GenericMethod) || (this is Iterator))
 823                                 tb = Parent.TypeBuilder;
 824                         else
 825                                 tb = TypeBuilder;
 826
 827                         if (check_type.IsGenericInstance)
 828                                 check_type = check_type.GetGenericTypeDefinition ();
 829
 830                         if (check_type == tb)
 831                                 return true;
 832
 833                         if (TypeBuilder == null)
 834                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 835                                 //        However, this is invoked again later -- so safe to return true.
 836                                 //        May also be null when resolving top-level attributes.
 837                                 return true;
 838
 839                         if (check_type.IsGenericParameter)
 840                                 return true; // FIXME
 841
 842                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 843
 844                         //
 845                         // Broken Microsoft runtime, return public for arrays, no matter what
 846                         // the accessibility is for their underlying class, and they return
 847                         // NonPublic visibility for pointers
 848                         //
 849                         if (check_type.IsArray || check_type.IsPointer)
 850                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 851
 852                         switch (check_attr){
 853                         case TypeAttributes.Public:
 854                                 return true;
 855
 856                         case TypeAttributes.NotPublic:
 857
 858                                 if (TypeBuilder == null)
 859                                         // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 860                                         //        However, this is invoked again later -- so safe to return true.
 861                                         //        May also be null when resolving top-level attributes.
 862                                         return true;
 863                                 //
 864                                 // This test should probably use the declaringtype.
 865                                 //
 866                                 return check_type.Assembly == TypeBuilder.Assembly;
 867
 868                         case TypeAttributes.NestedPublic:
 869                                 return true;
 870
 871                         case TypeAttributes.NestedPrivate:
 872                                 return NestedAccessible (tb, check_type);
 873
 874                         case TypeAttributes.NestedFamily:
 875                                 //
 876                                 // Only accessible to methods in current type or any subtypes
 877                                 //
 878                                 return FamilyAccessible (tb, check_type);
 879
 880                         case TypeAttributes.NestedFamANDAssem:
 881                                 return (check_type.Assembly == tb.Assembly) &&
 882                                         FamilyAccessible (tb, check_type);
 883
 884                         case TypeAttributes.NestedFamORAssem:
 885                                 return (check_type.Assembly == tb.Assembly) ||
 886                                         FamilyAccessible (tb, check_type);
 887
 888                         case TypeAttributes.NestedAssembly:
 889                                 return check_type.Assembly == tb.Assembly;
 890                         }
 891
 892                         Console.WriteLine ("HERE: " + check_attr);
 893                         return false;
 894
 895                 }
 896
 897                 protected bool NestedAccessible (Type tb, Type check_type)
 898                 {
 899                         Type declaring = check_type.DeclaringType;
 900                         return TypeBuilder == declaring ||
 901                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 902                 }
 903
 904                 protected bool FamilyAccessible (Type tb, Type check_type)
 905                 {
 906                         Type declaring = check_type.DeclaringType;
 907                         if (tb == declaring || TypeManager.IsFamilyAccessible (tb, declaring))
 908                                 return true;
 909
 910                         return NestedAccessible (tb, check_type);
 911                 }
 912
 913                 // Access level of a type.
 914                 const int X = 1;
 915                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 916                         // Public    Assembly   Protected
 917                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 918                         Public              = (X << 0) | (X << 1) | (X << 2),
 919                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 920                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 921                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 922                 }
 923
 924                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 925                 {
 926                         if ((flags & Modifiers.INTERNAL) != 0) {
 927
 928                                 if ((flags & Modifiers.PROTECTED) != 0)
 929                                         return AccessLevel.ProtectedOrInternal;
 930                                 else
 931                                         return AccessLevel.Internal;
 932
 933                         } else if ((flags & Modifiers.PROTECTED) != 0)
 934                                 return AccessLevel.Protected;
 935                         else if ((flags & Modifiers.PRIVATE) != 0)
 936                                 return AccessLevel.Private;
 937                         else
 938                                 return AccessLevel.Public;
 939                 }
 940
 941                 // What is the effective access level of this?
 942                 // TODO: Cache this?
 943                 AccessLevel EffectiveAccessLevel {
 944                         get {
 945                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 946                                 if (!IsTopLevel && (Parent != null))
 947                                         return myAccess & Parent.EffectiveAccessLevel;
 948                                 return myAccess;
 949                         }
 950                 }
 951
 952                 // Return the access level for type `t'
 953                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 954                 {
 955                         if (t.IsPublic)
 956                                 return AccessLevel.Public;
 957                         if (t.IsNestedPrivate)
 958                                 return AccessLevel.Private;
 959                         if (t.IsNotPublic)
 960                                 return AccessLevel.Internal;
 961
 962                         // By now, it must be nested
 963                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
 964
 965                         if (t.IsNestedPublic)
 966                                 return parentLevel;
 967                         if (t.IsNestedAssembly)
 968                                 return parentLevel & AccessLevel.Internal;
 969                         if (t.IsNestedFamily)
 970                                 return parentLevel & AccessLevel.Protected;
 971                         if (t.IsNestedFamORAssem)
 972                                 return parentLevel & AccessLevel.ProtectedOrInternal;
 973                         if (t.IsNestedFamANDAssem)
 974                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 975
 976                         // nested private is taken care of
 977
 978                         throw new Exception ("I give up, what are you?");
 979                 }
 980
 981                 //
 982                 // This answers `is the type P, as accessible as a member M which has the
 983                 // accessability @flags which is declared as a nested member of the type T, this declspace'
 984                 //
 985                 public bool AsAccessible (Type p, int flags)
 986                 {
 987                         if (p.IsGenericParameter)
 988                                 return true; // FIXME
 989
 990                         //
 991                         // 1) if M is private, its accessability is the same as this declspace.
 992                         // we already know that P is accessible to T before this method, so we
 993                         // may return true.
 994                         //
 995
 996                         if ((flags & Modifiers.PRIVATE) != 0)
 997                                 return true;
 998
 999                         while (p.IsArray || p.IsPointer || p.IsByRef)
1000                                 p = TypeManager.GetElementType (p);
1001
1002                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
1003                         AccessLevel mAccess = this.EffectiveAccessLevel &
1004                                 GetAccessLevelFromModifiers (flags);
1005
1006                         // for every place from which we can access M, we must
1007                         // be able to access P as well. So, we want
1008                         // For every bit in M and P, M_i -> P_1 == true
1009                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
1010
1011                         return ~ (~ mAccess | pAccess) == 0;
1012                 }
1013
1014                 public static void Error_AmbiguousTypeReference (Location loc, string name, string t1, string t2)
1015                 {
1016                         Report.Error (104, loc,
1017                                       "`{0}' is an ambiguous reference ({1} or {2})",
1018                                       name, t1, t2);
1019                 }
1020
1021                 //
1022                 // Return the nested type with name @name.  Ensures that the nested type
1023                 // is defined if necessary.  Do _not_ use this when you have a MemberCache handy.
1024                 //
1025                 public virtual Type FindNestedType (string name)
1026                 {
1027                         return null;
1028                 }
1029
1030                 private Type LookupNestedTypeInHierarchy (string name)
1031                 {
1032                         // if the member cache has been created, lets use it.
1033                         // the member cache is MUCH faster.
1034                         if (MemberCache != null)
1035                                 return MemberCache.FindNestedType (name);
1036
1037                         // no member cache. Do it the hard way -- reflection
1038                         Type t = null;
1039                         for (Type current_type = TypeBuilder;
1040                              current_type != null && current_type != TypeManager.object_type;
1041                              current_type = current_type.BaseType) {
1042                                 if (current_type is TypeBuilder) {
1043                                         DeclSpace decl = this;
1044                                         if (current_type != TypeBuilder)
1045                                                 decl = TypeManager.LookupDeclSpace (current_type);
1046                                         t = decl.FindNestedType (name);
1047                                 } else {
1048                                         t = TypeManager.GetNestedType (current_type, name);
1049                                 }
1050
1051                                 if (t != null && CheckAccessLevel (t))
1052                                         return t;
1053                         }
1054
1055                         return null;
1056                 }
1057
1058                 //
1059                 // Public function used to locate types, this can only
1060                 // be used after the ResolveTree function has been invoked.
1061                 //
1062                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1063                 //
1064                 // Returns: Type or null if they type can not be found.
1065                 //
1066                 public FullNamedExpression LookupType (string name, Location loc, bool ignore_cs0104)
1067                 {
1068                         if (this is PartialContainer)
1069                                 throw new InternalErrorException ("Should not get here");
1070
1071                         if (Cache.Contains (name))
1072                                 return (FullNamedExpression) Cache [name];
1073
1074                         FullNamedExpression e;
1075                         Type t = LookupNestedTypeInHierarchy (name);
1076                         if (t != null)
1077                                 e = new TypeExpression (t, Location.Null);
1078                         else if (Parent != null && Parent != RootContext.Tree.Types)
1079                                 e = Parent.LookupType (name, loc, ignore_cs0104);
1080                         else
1081                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
1082
1083                         Cache [name] = e;
1084                         return e;
1085                 }
1086
1087                 /// <remarks>
1088                 ///   This function is broken and not what you're looking for.  It should only
1089                 ///   be used while the type is still being created since it doesn't use the cache
1090                 ///   and relies on the filter doing the member name check.
1091                 /// </remarks>
1092                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1093                                                         MemberFilter filter, object criteria);
1094
1095                 /// <remarks>
1096                 ///   If we have a MemberCache, return it.  This property may return null if the
1097                 ///   class doesn't have a member cache or while it's still being created.
1098                 /// </remarks>
1099                 public abstract MemberCache MemberCache {
1100                         get;
1101                 }
1102
1103                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1104                 {
1105                         if (a.Type == TypeManager.required_attr_type) {
1106                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1107                                 return;
1108                         }
1109                         TypeBuilder.SetCustomAttribute (cb);
1110                 }
1111
1112                 /// <summary>
1113                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
1114                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
1115                 /// </summary>
1116                 public bool GetClsCompliantAttributeValue ()
1117                 {
1118                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
1119                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
1120
1121                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
1122
1123                         if (OptAttributes != null) {
1124                                 Attribute cls_attribute = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, ec);
1125                                 if (cls_attribute != null) {
1126                                         caching_flags |= Flags.HasClsCompliantAttribute;
1127                                         if (cls_attribute.GetClsCompliantAttributeValue (ec)) {
1128                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1129                                                 return true;
1130                                         }
1131                                         return false;
1132                                 }
1133                         }
1134
1135                         if (Parent == null) {
1136                                 if (CodeGen.Assembly.IsClsCompliant) {
1137                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
1138                                         return true;
1139                                 }
1140                                 return false;
1141                         }
1142
1143                         if (Parent.GetClsCompliantAttributeValue ()) {
1144                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1145                                 return true;
1146                         }
1147                         return false;
1148                 }
1149
1150                 //
1151                 // Extensions for generics
1152                 //
1153                 TypeParameter[] type_params;
1154                 TypeParameter[] type_param_list;
1155
1156                 protected string GetInstantiationName ()
1157                 {
1158                         StringBuilder sb = new StringBuilder (Name);
1159                         sb.Append ("<");
1160                         for (int i = 0; i < type_param_list.Length; i++) {
1161                                 if (i > 0)
1162                                         sb.Append (",");
1163                                 sb.Append (type_param_list [i].Name);
1164                         }
1165                         sb.Append (">");
1166                         return sb.ToString ();
1167                 }
1168
1169                 bool check_type_parameter (ArrayList list, int start, string name)
1170                 {
1171                         for (int i = 0; i < start; i++) {
1172                                 TypeParameter param = (TypeParameter) list [i];
1173
1174                                 if (param.Name != name)
1175                                         continue;
1176
1177                                 if (RootContext.WarningLevel >= 3)
1178                                         Report.Warning (
1179                                                 693, Location,
1180                                                 "Type parameter `{0}' has same name " +
1181                                                 "as type parameter from outer type `{1}'",
1182                                                 name, Parent.GetInstantiationName ());
1183
1184                                 return false;
1185                         }
1186
1187                         return true;
1188                 }
1189
1190                 TypeParameter[] initialize_type_params ()
1191                 {
1192                         if (type_param_list != null)
1193                                 return type_param_list;
1194
1195                         DeclSpace the_parent = Parent;
1196                         if (this is GenericMethod)
1197                                 the_parent = null;
1198
1199                         int start = 0;
1200                         TypeParameter[] parent_params = null;
1201                         if ((the_parent != null) && the_parent.IsGeneric) {
1202                                 parent_params = the_parent.initialize_type_params ();
1203                                 start = parent_params != null ? parent_params.Length : 0;
1204                         }
1205
1206                         ArrayList list = new ArrayList ();
1207                         if (parent_params != null)
1208                                 list.AddRange (parent_params);
1209
1210                         int count = type_params != null ? type_params.Length : 0;
1211                         for (int i = 0; i < count; i++) {
1212                                 TypeParameter param = type_params [i];
1213                                 check_type_parameter (list, start, param.Name);
1214                                 list.Add (param);
1215                         }
1216
1217                         type_param_list = new TypeParameter [list.Count];
1218                         list.CopyTo (type_param_list, 0);
1219                         return type_param_list;
1220                 }
1221
1222                 public virtual void SetParameterInfo (ArrayList constraints_list)
1223                 {
1224                         if (!is_generic) {
1225                                 if (constraints_list != null) {
1226                                         Report.Error (
1227                                                 80, Location, "Contraints are not allowed " +
1228                                                 "on non-generic declarations");
1229                                 }
1230
1231                                 return;
1232                         }
1233
1234                         string[] names = MemberName.TypeArguments.GetDeclarations ();
1235                         type_params = new TypeParameter [names.Length];
1236
1237                         //
1238                         // Register all the names
1239                         //
1240                         for (int i = 0; i < type_params.Length; i++) {
1241                                 string name = names [i];
1242
1243                                 Constraints constraints = null;
1244                                 if (constraints_list != null) {
1245                                         foreach (Constraints constraint in constraints_list) {
1246                                                 if (constraint.TypeParameter == name) {
1247                                                         constraints = constraint;
1248                                                         break;
1249                                                 }
1250                                         }
1251                                 }
1252
1253                                 type_params [i] = new TypeParameter (Parent, name, constraints, Location);
1254
1255                                 AddToContainer (type_params [i], name);
1256                         }
1257                 }
1258
1259                 public TypeParameter[] TypeParameters {
1260                         get {
1261                                 if (!IsGeneric)
1262                                         throw new InvalidOperationException ();
1263                                 if (type_param_list == null)
1264                                         initialize_type_params ();
1265
1266                                 return type_param_list;
1267                         }
1268                 }
1269
1270                 protected TypeParameter[] CurrentTypeParameters {
1271                         get {
1272                                 if (!IsGeneric)
1273                                         throw new InvalidOperationException ();
1274                                 if (type_params != null)
1275                                         return type_params;
1276                                 else
1277                                         return new TypeParameter [0];
1278                         }
1279                 }
1280
1281                 public int CountTypeParameters {
1282                         get {
1283                                 return count_type_params;
1284                         }
1285                 }
1286
1287                 public int CountCurrentTypeParameters {
1288                         get {
1289                                 return count_current_type_params;
1290                         }
1291                 }
1292
1293                 public TypeParameterExpr LookupGeneric (string name, Location loc)
1294                 {
1295                         if (!IsGeneric)
1296                                 return null;
1297
1298                         foreach (TypeParameter type_param in CurrentTypeParameters) {
1299                                 if (type_param.Name != name)
1300                                         continue;
1301
1302                                 return new TypeParameterExpr (type_param, loc);
1303                         }
1304
1305                         if (Parent != null)
1306                                 return Parent.LookupGeneric (name, loc);
1307
1308                         return null;
1309                 }
1310
1311                 bool IAlias.IsType {
1312                         get { return true; }
1313                 }
1314
1315                 string IAlias.Name {
1316                         get { return Name; }
1317                 }
1318
1319                 TypeExpr IAlias.ResolveAsType (EmitContext ec)
1320                 {
1321                         if (TypeBuilder == null)
1322                                 throw new InvalidOperationException ();
1323
1324                         if (CurrentType != null)
1325                                 return new TypeExpression (CurrentType, Location);
1326                         else
1327                                 return new TypeExpression (TypeBuilder, Location);
1328                 }
1329
1330                 public override string[] ValidAttributeTargets {
1331                         get {
1332                                 return attribute_targets;
1333                         }
1334                 }
1335         }
1336
1337         /// <summary>
1338         ///   This is a readonly list of MemberInfo's.
1339         /// </summary>
1340         public class MemberList : IList {
1341                 public readonly IList List;
1342                 int count;
1343
1344                 /// <summary>
1345                 ///   Create a new MemberList from the given IList.
1346                 /// </summary>
1347                 public MemberList (IList list)
1348                 {
1349                         if (list != null)
1350                                 this.List = list;
1351                         else
1352                                 this.List = new ArrayList ();
1353                         count = List.Count;
1354                 }
1355
1356                 /// <summary>
1357                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1358                 /// </summary>
1359                 public MemberList (IList first, IList second)
1360                 {
1361                         ArrayList list = new ArrayList ();
1362                         list.AddRange (first);
1363                         list.AddRange (second);
1364                         count = list.Count;
1365                         List = list;
1366                 }
1367
1368                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1369
1370                 /// <summary>
1371                 ///   Cast the MemberList into a MemberInfo[] array.
1372                 /// </summary>
1373                 /// <remarks>
1374                 ///   This is an expensive operation, only use it if it's really necessary.
1375                 /// </remarks>
1376                 public static explicit operator MemberInfo [] (MemberList list)
1377                 {
1378                         Timer.StartTimer (TimerType.MiscTimer);
1379                         MemberInfo [] result = new MemberInfo [list.Count];
1380                         list.CopyTo (result, 0);
1381                         Timer.StopTimer (TimerType.MiscTimer);
1382                         return result;
1383                 }
1384
1385                 // ICollection
1386
1387                 public int Count {
1388                         get {
1389                                 return count;
1390                         }
1391                 }
1392
1393                 public bool IsSynchronized {
1394                         get {
1395                                 return List.IsSynchronized;
1396                         }
1397                 }
1398
1399                 public object SyncRoot {
1400                         get {
1401                                 return List.SyncRoot;
1402                         }
1403                 }
1404
1405                 public void CopyTo (Array array, int index)
1406                 {
1407                         List.CopyTo (array, index);
1408                 }
1409
1410                 // IEnumerable
1411
1412                 public IEnumerator GetEnumerator ()
1413                 {
1414                         return List.GetEnumerator ();
1415                 }
1416
1417                 // IList
1418
1419                 public bool IsFixedSize {
1420                         get {
1421                                 return true;
1422                         }
1423                 }
1424
1425                 public bool IsReadOnly {
1426                         get {
1427                                 return true;
1428                         }
1429                 }
1430
1431                 object IList.this [int index] {
1432                         get {
1433                                 return List [index];
1434                         }
1435
1436                         set {
1437                                 throw new NotSupportedException ();
1438                         }
1439                 }
1440
1441                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1442                 public MemberInfo this [int index] {
1443                         get {
1444                                 return (MemberInfo) List [index];
1445                         }
1446                 }
1447
1448                 public int Add (object value)
1449                 {
1450                         throw new NotSupportedException ();
1451                 }
1452
1453                 public void Clear ()
1454                 {
1455                         throw new NotSupportedException ();
1456                 }
1457
1458                 public bool Contains (object value)
1459                 {
1460                         return List.Contains (value);
1461                 }
1462
1463                 public int IndexOf (object value)
1464                 {
1465                         return List.IndexOf (value);
1466                 }
1467
1468                 public void Insert (int index, object value)
1469                 {
1470                         throw new NotSupportedException ();
1471                 }
1472
1473                 public void Remove (object value)
1474                 {
1475                         throw new NotSupportedException ();
1476                 }
1477
1478                 public void RemoveAt (int index)
1479                 {
1480                         throw new NotSupportedException ();
1481                 }
1482         }
1483
1484         /// <summary>
1485         ///   This interface is used to get all members of a class when creating the
1486         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1487         ///   want to support the member cache and by TypeHandle to get caching of
1488         ///   non-dynamic types.
1489         /// </summary>
1490         public interface IMemberContainer {
1491                 /// <summary>
1492                 ///   The name of the IMemberContainer.  This is only used for
1493                 ///   debugging purposes.
1494                 /// </summary>
1495                 string Name {
1496                         get;
1497                 }
1498
1499                 /// <summary>
1500                 ///   The type of this IMemberContainer.
1501                 /// </summary>
1502                 Type Type {
1503                         get;
1504                 }
1505
1506                 /// <summary>
1507                 ///   Returns the IMemberContainer of the base class or null if this
1508                 ///   is an interface or TypeManger.object_type.
1509                 ///   This is used when creating the member cache for a class to get all
1510                 ///   members from the base class.
1511                 /// </summary>
1512                 MemberCache BaseCache {
1513                         get;
1514                 }
1515
1516                 /// <summary>
1517                 ///   Whether this is an interface.
1518                 /// </summary>
1519                 bool IsInterface {
1520                         get;
1521                 }
1522
1523                 /// <summary>
1524                 ///   Returns all members of this class with the corresponding MemberTypes
1525                 ///   and BindingFlags.
1526                 /// </summary>
1527                 /// <remarks>
1528                 ///   When implementing this method, make sure not to return any inherited
1529                 ///   members and check the MemberTypes and BindingFlags properly.
1530                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1531                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1532                 ///   MemberInfo class, but the cache needs this information.  That's why
1533                 ///   this method is called multiple times with different BindingFlags.
1534                 /// </remarks>
1535                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1536
1537                 /// <summary>
1538                 ///   Return the container's member cache.
1539                 /// </summary>
1540                 MemberCache MemberCache {
1541                         get;
1542                 }
1543         }
1544
1545         /// <summary>
1546         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1547         ///   member lookups.  It has a member name based hash table; it maps each member
1548         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1549         ///   and the BindingFlags that were initially used to get it.  The cache contains
1550         ///   all members of the current class and all inherited members.  If this cache is
1551         ///   for an interface types, it also contains all inherited members.
1552         ///
1553         ///   There are two ways to get a MemberCache:
1554         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1555         ///     use the DeclSpace.MemberCache property.
1556         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1557         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1558         /// </summary>
1559         public class MemberCache {
1560                 public readonly IMemberContainer Container;
1561                 protected Hashtable member_hash;
1562                 protected Hashtable method_hash;
1563
1564                 /// <summary>
1565                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1566                 /// </summary>
1567                 public MemberCache (IMemberContainer container)
1568                 {
1569                         this.Container = container;
1570
1571                         Timer.IncrementCounter (CounterType.MemberCache);
1572                         Timer.StartTimer (TimerType.CacheInit);
1573
1574                         // If we have a base class (we have a base class unless we're
1575                         // TypeManager.object_type), we deep-copy its MemberCache here.
1576                         if (Container.BaseCache != null)
1577                                 member_hash = SetupCache (Container.BaseCache);
1578                         else
1579                                 member_hash = new Hashtable ();
1580
1581                         // If this is neither a dynamic type nor an interface, create a special
1582                         // method cache with all declared and inherited methods.
1583                         Type type = container.Type;
1584                         if (!(type is TypeBuilder) && !type.IsInterface &&
1585                             // !(type.IsGenericInstance && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
1586                             !type.IsGenericInstance &&
1587                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1588                                 method_hash = new Hashtable ();
1589                                 AddMethods (type);
1590                         }
1591
1592                         // Add all members from the current class.
1593                         AddMembers (Container);
1594
1595                         Timer.StopTimer (TimerType.CacheInit);
1596                 }
1597
1598                 public MemberCache (Type[] ifaces)
1599                 {
1600                         //
1601                         // The members of this cache all belong to other caches.
1602                         // So, 'Container' will not be used.
1603                         //
1604                         this.Container = null;
1605
1606                         member_hash = new Hashtable ();
1607                         if (ifaces == null)
1608                                 return;
1609
1610                         foreach (Type itype in ifaces)
1611                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1612                 }
1613
1614                 /// <summary>
1615                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1616                 /// </summary>
1617                 Hashtable SetupCache (MemberCache base_class)
1618                 {
1619                         Hashtable hash = new Hashtable ();
1620
1621                         if (base_class == null)
1622                                 return hash;
1623
1624                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1625                         while (it.MoveNext ()) {
1626                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1627                          }
1628
1629                         return hash;
1630                 }
1631
1632                 /// <summary>
1633                 ///   Add the contents of `cache' to the member_hash.
1634                 /// </summary>
1635                 void AddCacheContents (MemberCache cache)
1636                 {
1637                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1638                         while (it.MoveNext ()) {
1639                                 ArrayList list = (ArrayList) member_hash [it.Key];
1640                                 if (list == null)
1641                                         member_hash [it.Key] = list = new ArrayList ();
1642
1643                                 ArrayList entries = (ArrayList) it.Value;
1644                                 for (int i = entries.Count-1; i >= 0; i--) {
1645                                         CacheEntry entry = (CacheEntry) entries [i];
1646
1647                                         if (entry.Container != cache.Container)
1648                                                 break;
1649                                         list.Add (entry);
1650                                 }
1651                         }
1652                 }
1653
1654                 /// <summary>
1655                 ///   Add all members from class `container' to the cache.
1656                 /// </summary>
1657                 void AddMembers (IMemberContainer container)
1658                 {
1659                         // We need to call AddMembers() with a single member type at a time
1660                         // to get the member type part of CacheEntry.EntryType right.
1661                         if (!container.IsInterface) {
1662                         AddMembers (MemberTypes.Constructor, container);
1663                         AddMembers (MemberTypes.Field, container);
1664                         }
1665                         AddMembers (MemberTypes.Method, container);
1666                         AddMembers (MemberTypes.Property, container);
1667                         AddMembers (MemberTypes.Event, container);
1668                         // Nested types are returned by both Static and Instance searches.
1669                         AddMembers (MemberTypes.NestedType,
1670                                     BindingFlags.Static | BindingFlags.Public, container);
1671                         AddMembers (MemberTypes.NestedType,
1672                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1673                 }
1674
1675                 void AddMembers (MemberTypes mt, IMemberContainer container)
1676                 {
1677                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1678                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1679                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1680                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1681                 }
1682
1683                 /// <summary>
1684                 ///   Add all members from class `container' with the requested MemberTypes and
1685                 ///   BindingFlags to the cache.  This method is called multiple times with different
1686                 ///   MemberTypes and BindingFlags.
1687                 /// </summary>
1688                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1689                 {
1690                         MemberList members = container.GetMembers (mt, bf);
1691
1692                         foreach (MemberInfo member in members) {
1693                                 string name = member.Name;
1694
1695                                 int pos = name.IndexOf ('<');
1696                                 if (pos > 0)
1697                                         name = name.Substring (0, pos);
1698
1699                                 // We use a name-based hash table of ArrayList's.
1700                                 ArrayList list = (ArrayList) member_hash [name];
1701                                 if (list == null) {
1702                                         list = new ArrayList ();
1703                                         member_hash.Add (name, list);
1704                                 }
1705
1706                                 // When this method is called for the current class, the list will
1707                                 // already contain all inherited members from our base classes.
1708                                 // We cannot add new members in front of the list since this'd be an
1709                                 // expensive operation, that's why the list is sorted in reverse order
1710                                 // (ie. members from the current class are coming last).
1711                                 list.Add (new CacheEntry (container, member, mt, bf));
1712                         }
1713                 }
1714
1715                 /// <summary>
1716                 ///   Add all declared and inherited methods from class `type' to the method cache.
1717                 /// </summary>
1718                 void AddMethods (Type type)
1719                 {
1720                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1721                                     BindingFlags.FlattenHierarchy, type);
1722                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1723                                     BindingFlags.FlattenHierarchy, type);
1724                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1725                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1726                 }
1727
1728                 void AddMethods (BindingFlags bf, Type type)
1729                 {
1730                         //
1731                         // Consider the case:
1732                         //
1733                         //   class X { public virtual int f() {} }
1734                         //   class Y : X {}
1735                         //
1736                         // When processing 'Y', the method_cache will already have a copy of 'f',
1737                         // with ReflectedType == X.  However, we want to ensure that its ReflectedType == Y
1738                         //
1739                         MethodBase [] members = type.GetMethods (bf);
1740
1741                         Array.Reverse (members);
1742
1743                         foreach (MethodBase member in members) {
1744                                 string name = member.Name;
1745
1746                                 // We use a name-based hash table of ArrayList's.
1747                                 ArrayList list = (ArrayList) method_hash [name];
1748                                 if (list == null) {
1749                                         list = new ArrayList ();
1750                                         method_hash.Add (name, list);
1751                                 }
1752
1753                                 MethodInfo curr = (MethodInfo) member;
1754                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1755                                         MethodInfo base_method = curr.GetBaseDefinition ();
1756
1757                                         if (base_method == curr) {
1758                                                 //
1759                                                 // Both mcs and CSC 1.1 seem to emit a somewhat broken
1760                                                 // ...Invoke () function for delegates: it's missing a 'newslot'.
1761                                                 // CSC 2.0 emits a 'newslot' for a delegate's Invoke.
1762                                                 //
1763                                                 // Also, CSC 1.1 appears to emit 'Finalize' without a newslot.
1764                                                 //
1765                                                 if ((curr.Name == "Invoke" && TypeManager.IsDelegateType (curr.DeclaringType)) ||
1766                                                     (curr.Name == "Finalize" && curr.GetParameters().Length == 0 && curr.DeclaringType == TypeManager.object_type))
1767                                                         break;
1768
1769                                                 Report.SymbolRelatedToPreviousError (base_method);
1770                                                 Report.Warning (-28,
1771                                                                 "The method '{0}' is marked 'override'," +
1772                                                                 " but doesn't appear to override any virtual or abstract method:" +
1773                                                                 " it may be ignored during overload resolution",
1774                                                                 TypeManager.CSharpSignature (base_method));
1775                                                 break;
1776                                         }
1777
1778                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1779                                         curr = base_method;
1780                                 }
1781
1782                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1783                                 // sorted so we need to do this check for every member.
1784                                 BindingFlags new_bf = bf;
1785                                 if (member.DeclaringType == type)
1786                                         new_bf |= BindingFlags.DeclaredOnly;
1787
1788                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1789                         }
1790                 }
1791
1792                 /// <summary>
1793                 ///   Compute and return a appropriate `EntryType' magic number for the given
1794                 ///   MemberTypes and BindingFlags.
1795                 /// </summary>
1796                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1797                 {
1798                         EntryType type = EntryType.None;
1799
1800                         if ((mt & MemberTypes.Constructor) != 0)
1801                                 type |= EntryType.Constructor;
1802                         if ((mt & MemberTypes.Event) != 0)
1803                                 type |= EntryType.Event;
1804                         if ((mt & MemberTypes.Field) != 0)
1805                                 type |= EntryType.Field;
1806                         if ((mt & MemberTypes.Method) != 0)
1807                                 type |= EntryType.Method;
1808                         if ((mt & MemberTypes.Property) != 0)
1809                                 type |= EntryType.Property;
1810                         // Nested types are returned by static and instance searches.
1811                         if ((mt & MemberTypes.NestedType) != 0)
1812                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1813
1814                         if ((bf & BindingFlags.Instance) != 0)
1815                                 type |= EntryType.Instance;
1816                         if ((bf & BindingFlags.Static) != 0)
1817                                 type |= EntryType.Static;
1818                         if ((bf & BindingFlags.Public) != 0)
1819                                 type |= EntryType.Public;
1820                         if ((bf & BindingFlags.NonPublic) != 0)
1821                                 type |= EntryType.NonPublic;
1822                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1823                                 type |= EntryType.Declared;
1824
1825                         return type;
1826                 }
1827
1828                 /// <summary>
1829                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1830                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1831                 ///   single member types.
1832                 /// </summary>
1833                 public static bool IsSingleMemberType (MemberTypes mt)
1834                 {
1835                         switch (mt) {
1836                         case MemberTypes.Constructor:
1837                         case MemberTypes.Event:
1838                         case MemberTypes.Field:
1839                         case MemberTypes.Method:
1840                         case MemberTypes.Property:
1841                         case MemberTypes.NestedType:
1842                                 return true;
1843
1844                         default:
1845                                 return false;
1846                         }
1847                 }
1848
1849                 /// <summary>
1850                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1851                 ///   number to speed up the searching process.
1852                 /// </summary>
1853                 [Flags]
1854                 protected enum EntryType {
1855                         None            = 0x000,
1856
1857                         Instance        = 0x001,
1858                         Static          = 0x002,
1859                         MaskStatic      = Instance|Static,
1860
1861                         Public          = 0x004,
1862                         NonPublic       = 0x008,
1863                         MaskProtection  = Public|NonPublic,
1864
1865                         Declared        = 0x010,
1866
1867                         Constructor     = 0x020,
1868                         Event           = 0x040,
1869                         Field           = 0x080,
1870                         Method          = 0x100,
1871                         Property        = 0x200,
1872                         NestedType      = 0x400,
1873
1874                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1875                 }
1876
1877                 protected class CacheEntry {
1878                         public readonly IMemberContainer Container;
1879                         public EntryType EntryType;
1880                         public MemberInfo Member;
1881
1882                         public CacheEntry (IMemberContainer container, MemberInfo member,
1883                                            MemberTypes mt, BindingFlags bf)
1884                         {
1885                                 this.Container = container;
1886                                 this.Member = member;
1887                                 this.EntryType = GetEntryType (mt, bf);
1888                         }
1889
1890                         public override string ToString ()
1891                         {
1892                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1893                                                       EntryType, Member);
1894                         }
1895                 }
1896
1897                 /// <summary>
1898                 ///   This is called each time we're walking up one level in the class hierarchy
1899                 ///   and checks whether we can abort the search since we've already found what
1900                 ///   we were looking for.
1901                 /// </summary>
1902                 protected bool DoneSearching (ArrayList list)
1903                 {
1904                         //
1905                         // We've found exactly one member in the current class and it's not
1906                         // a method or constructor.
1907                         //
1908                         if (list.Count == 1 && !(list [0] is MethodBase))
1909                                 return true;
1910
1911                         //
1912                         // Multiple properties: we query those just to find out the indexer
1913                         // name
1914                         //
1915                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1916                                 return true;
1917
1918                         return false;
1919                 }
1920
1921                 /// <summary>
1922                 ///   Looks up members with name `name'.  If you provide an optional
1923                 ///   filter function, it'll only be called with members matching the
1924                 ///   requested member name.
1925                 ///
1926                 ///   This method will try to use the cache to do the lookup if possible.
1927                 ///
1928                 ///   Unlike other FindMembers implementations, this method will always
1929                 ///   check all inherited members - even when called on an interface type.
1930                 ///
1931                 ///   If you know that you're only looking for methods, you should use
1932                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1933                 ///   When doing a method-only search, it'll try to use a special method
1934                 ///   cache (unless it's a dynamic type or an interface) and the returned
1935                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1936                 ///   The lookup process will automatically restart itself in method-only
1937                 ///   search mode if it discovers that it's about to return methods.
1938                 /// </summary>
1939                 ArrayList global = new ArrayList ();
1940                 bool using_global = false;
1941
1942                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1943
1944                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1945                                                MemberFilter filter, object criteria)
1946                 {
1947                         if (using_global)
1948                                 throw new Exception ();
1949
1950                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1951                         bool method_search = mt == MemberTypes.Method;
1952                         // If we have a method cache and we aren't already doing a method-only search,
1953                         // then we restart a method search if the first match is a method.
1954                         bool do_method_search = !method_search && (method_hash != null);
1955
1956                         ArrayList applicable;
1957
1958                         // If this is a method-only search, we try to use the method cache if
1959                         // possible; a lookup in the method cache will return a MemberInfo with
1960                         // the correct ReflectedType for inherited methods.
1961
1962                         if (method_search && (method_hash != null))
1963                                 applicable = (ArrayList) method_hash [name];
1964                         else
1965                                 applicable = (ArrayList) member_hash [name];
1966
1967                         if (applicable == null)
1968                                 return emptyMemberInfo;
1969
1970                         //
1971                         // 32  slots gives 53 rss/54 size
1972                         // 2/4 slots gives 55 rss
1973                         //
1974                         // Strange: from 25,000 calls, only 1,800
1975                         // are above 2.  Why does this impact it?
1976                         //
1977                         global.Clear ();
1978                         using_global = true;
1979
1980                         Timer.StartTimer (TimerType.CachedLookup);
1981
1982                         EntryType type = GetEntryType (mt, bf);
1983
1984                         IMemberContainer current = Container;
1985
1986
1987                         // `applicable' is a list of all members with the given member name `name'
1988                         // in the current class and all its base classes.  The list is sorted in
1989                         // reverse order due to the way how the cache is initialy created (to speed
1990                         // things up, we're doing a deep-copy of our base).
1991
1992                         for (int i = applicable.Count-1; i >= 0; i--) {
1993                                 CacheEntry entry = (CacheEntry) applicable [i];
1994
1995                                 // This happens each time we're walking one level up in the class
1996                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
1997                                 // the first time this happens (this may already happen in the first
1998                                 // iteration of this loop if there are no members with the name we're
1999                                 // looking for in the current class).
2000                                 if (entry.Container != current) {
2001                                         if (declared_only || DoneSearching (global))
2002                                                 break;
2003
2004                                         current = entry.Container;
2005                                 }
2006
2007                                 // Is the member of the correct type ?
2008                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2009                                         continue;
2010
2011                                 // Is the member static/non-static ?
2012                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2013                                         continue;
2014
2015                                 // Apply the filter to it.
2016                                 if (filter (entry.Member, criteria)) {
2017                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
2018                                                 do_method_search = false;
2019                                         global.Add (entry.Member);
2020                                 }
2021                         }
2022
2023                         Timer.StopTimer (TimerType.CachedLookup);
2024
2025                         // If we have a method cache and we aren't already doing a method-only
2026                         // search, we restart in method-only search mode if the first match is
2027                         // a method.  This ensures that we return a MemberInfo with the correct
2028                         // ReflectedType for inherited methods.
2029                         if (do_method_search && (global.Count > 0)){
2030                                 using_global = false;
2031
2032                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2033                         }
2034
2035                         using_global = false;
2036                         MemberInfo [] copy = new MemberInfo [global.Count];
2037                         global.CopyTo (copy);
2038                         return copy;
2039                 }
2040
2041                 // find the nested type @name in @this.
2042                 public Type FindNestedType (string name)
2043                 {
2044                         ArrayList applicable = (ArrayList) member_hash [name];
2045                         if (applicable == null)
2046                                 return null;
2047
2048                         for (int i = applicable.Count-1; i >= 0; i--) {
2049                                 CacheEntry entry = (CacheEntry) applicable [i];
2050                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
2051                                         return (Type) entry.Member;
2052                         }
2053
2054                         return null;
2055                 }
2056
2057                 //
2058                 // This finds the method or property for us to override. invocationType is the type where
2059                 // the override is going to be declared, name is the name of the method/property, and
2060                 // paramTypes is the parameters, if any to the method or property
2061                 //
2062                 // Because the MemberCache holds members from this class and all the base classes,
2063                 // we can avoid tons of reflection stuff.
2064                 //
2065                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
2066                 {
2067                         ArrayList applicable;
2068                         if (method_hash != null && !is_property)
2069                                 applicable = (ArrayList) method_hash [name];
2070                         else
2071                                 applicable = (ArrayList) member_hash [name];
2072
2073                         if (applicable == null)
2074                                 return null;
2075                         //
2076                         // Walk the chain of methods, starting from the top.
2077                         //
2078                         for (int i = applicable.Count - 1; i >= 0; i--) {
2079                                 CacheEntry entry = (CacheEntry) applicable [i];
2080
2081                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2082                                         continue;
2083
2084                                 PropertyInfo pi = null;
2085                                 MethodInfo mi = null;
2086                                 FieldInfo fi = null;
2087                                 Type [] cmpAttrs = null;
2088
2089                                 if (is_property) {
2090                                         if ((entry.EntryType & EntryType.Field) != 0) {
2091                                                 fi = (FieldInfo)entry.Member;
2092
2093                                                 // TODO: For this case we ignore member type
2094                                                 //fb = TypeManager.GetField (fi);
2095                                                 //cmpAttrs = new Type[] { fb.MemberType };
2096                                         } else {
2097                                                 pi = (PropertyInfo) entry.Member;
2098                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
2099                                         }
2100                                 } else {
2101                                         mi = (MethodInfo) entry.Member;
2102                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
2103                                 }
2104
2105                                 if (fi != null) {
2106                                         // TODO: Almost duplicate !
2107                                         // Check visibility
2108                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2109                                                 case FieldAttributes.Private:
2110                                                         //
2111                                                         // A private method is Ok if we are a nested subtype.
2112                                                         // The spec actually is not very clear about this, see bug 52458.
2113                                                         //
2114                                                         if (invocationType != entry.Container.Type &
2115                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2116                                                                 continue;
2117
2118                                                         break;
2119                                                 case FieldAttributes.FamANDAssem:
2120                                                 case FieldAttributes.Assembly:
2121                                                         //
2122                                                         // Check for assembly methods
2123                                                         //
2124                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2125                                                                 continue;
2126                                                         break;
2127                                         }
2128                                         return entry.Member;
2129                                 }
2130
2131                                 //
2132                                 // Check the arguments
2133                                 //
2134                                 if (cmpAttrs.Length != paramTypes.Length)
2135                                         continue;
2136
2137                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --) {
2138                                         if (!TypeManager.IsEqual (paramTypes [j], cmpAttrs [j]))
2139                                                 goto next;
2140                                 }
2141
2142                                 //
2143                                 // get one of the methods because this has the visibility info.
2144                                 //
2145                                 if (is_property) {
2146                                         mi = pi.GetGetMethod (true);
2147                                         if (mi == null)
2148                                                 mi = pi.GetSetMethod (true);
2149                                 }
2150
2151                                 //
2152                                 // Check visibility
2153                                 //
2154                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2155                                 case MethodAttributes.Private:
2156                                         //
2157                                         // A private method is Ok if we are a nested subtype.
2158                                         // The spec actually is not very clear about this, see bug 52458.
2159                                         //
2160                                         if (invocationType.Equals (entry.Container.Type) ||
2161                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2162                                                 return entry.Member;
2163
2164                                         break;
2165                                 case MethodAttributes.FamANDAssem:
2166                                 case MethodAttributes.Assembly:
2167                                         //
2168                                         // Check for assembly methods
2169                                         //
2170                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
2171                                                 return entry.Member;
2172
2173                                         break;
2174                                 default:
2175                                         //
2176                                         // A protected method is ok, because we are overriding.
2177                                         // public is always ok.
2178                                         //
2179                                         return entry.Member;
2180                                 }
2181                         next:
2182                                 ;
2183                         }
2184
2185                         return null;
2186                 }
2187
2188                 /// <summary>
2189                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2190                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2191                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2192                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2193                 /// </summary>
2194                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2195                 {
2196                         ArrayList applicable = null;
2197
2198                         if (method_hash != null)
2199                                 applicable = (ArrayList) method_hash [name];
2200
2201                         if (applicable != null) {
2202                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2203                                         CacheEntry entry = (CacheEntry) applicable [i];
2204                                         if ((entry.EntryType & EntryType.Public) != 0)
2205                                                 return entry.Member;
2206                                 }
2207                         }
2208
2209                         if (member_hash == null)
2210                                 return null;
2211                         applicable = (ArrayList) member_hash [name];
2212
2213                         if (applicable != null) {
2214                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2215                                         CacheEntry entry = (CacheEntry) applicable [i];
2216                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2217                                                 if (ignore_complex_types) {
2218                                                         if ((entry.EntryType & EntryType.Method) != 0)
2219                                                                 continue;
2220
2221                                                         // Does exist easier way how to detect indexer ?
2222                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2223                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
2224                                                                 if (arg_types.Length > 0)
2225                                                                         continue;
2226                                                         }
2227                                                 }
2228                                                 return entry.Member;
2229                                         }
2230                                 }
2231                         }
2232                         return null;
2233                 }
2234
2235                 Hashtable locase_table;
2236
2237                 /// <summary>
2238                 /// Builds low-case table for CLS Compliance test
2239                 /// </summary>
2240                 public Hashtable GetPublicMembers ()
2241                 {
2242                         if (locase_table != null)
2243                                 return locase_table;
2244
2245                         locase_table = new Hashtable ();
2246                         foreach (DictionaryEntry entry in member_hash) {
2247                                 ArrayList members = (ArrayList)entry.Value;
2248                                 for (int ii = 0; ii < members.Count; ++ii) {
2249                                         CacheEntry member_entry = (CacheEntry) members [ii];
2250
2251                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2252                                                 continue;
2253
2254                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2255                                         switch (member_entry.EntryType & EntryType.MaskType) {
2256                                                 case EntryType.Constructor:
2257                                                         continue;
2258
2259                                                 case EntryType.Field:
2260                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2261                                                                 continue;
2262                                                         break;
2263
2264                                                 case EntryType.Method:
2265                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2266                                                                 continue;
2267                                                         break;
2268
2269                                                 case EntryType.Property:
2270                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
2271                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2272                                                                 continue;
2273                                                         break;
2274
2275                                                 case EntryType.Event:
2276                                                         EventInfo ei = (EventInfo)member_entry.Member;
2277                                                         MethodInfo mi = ei.GetAddMethod ();
2278                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2279                                                                 continue;
2280                                                         break;
2281                                         }
2282                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2283                                         locase_table [lcase] = member_entry.Member;
2284                                         break;
2285                                 }
2286                         }
2287                         return locase_table;
2288                 }
2289
2290                 public Hashtable Members {
2291                         get {
2292                                 return member_hash;
2293                         }
2294                 }
2295
2296                 /// <summary>
2297                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2298                 /// </summary>
2299                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2300                 {
2301                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2302
2303                         for (int i = 0; i < al.Count; ++i) {
2304                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2305
2306                                 // skip itself
2307                                 if (entry.Member == this_builder)
2308                                         continue;
2309
2310                                 if ((entry.EntryType & tested_type) != tested_type)
2311                                         continue;
2312
2313                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2314                                 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
2315                                         method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare));
2316
2317                                 if (result == AttributeTester.Result.Ok)
2318                                         continue;
2319
2320                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2321
2322                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2323                                 // However it is exactly what csc does.
2324                                 if (md != null && !md.IsClsComplianceRequired (method.Parent))
2325                                         continue;
2326
2327                                 Report.SymbolRelatedToPreviousError (entry.Member);
2328                                 switch (result) {
2329                                         case AttributeTester.Result.RefOutArrayError:
2330                                                 Report.Error (3006, method.Location, "Overloaded method '{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2331                                                 continue;
2332                                         case AttributeTester.Result.ArrayArrayError:
2333                                                 Report.Error (3007, method.Location, "Overloaded method '{0}' differing only by unnamed array types is not CLS-compliant", method.GetSignatureForError ());
2334                                                 continue;
2335                                 }
2336
2337                                 throw new NotImplementedException (result.ToString ());
2338                         }
2339                 }
2340         }
2341 }