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 GetMethodName ()
 114                 {
 115                         if (Left != null)
 116                                 return Left.GetTypeName () + "." + Name;
 117                         else
 118                                 return Name;
 119                 }
 120
 121                 public static string MakeName (string name, TypeArguments args)
 122                 {
 123                         if (args == null)
 124                                 return name;
 125                         else
 126                                 return name + "`" + args.Count;
 127                 }
 128
 129                 public static string MakeName (string name, int count)
 130                 {
 131                         return name + "`" + count;
 132                 }
 133
 134                 public string GetTypeName ()
 135                 {
 136                         if (Left != null)
 137                                 return Left.GetTypeName () + "." +
 138                                         MakeName (Name, TypeArguments);
 139                         else
 140                                 return MakeName (Name, TypeArguments);
 141                 }
 142
 143                 protected bool IsUnbound {
 144                         get {
 145                                 if ((Left != null) && Left.IsUnbound)
 146                                         return true;
 147                                 else if (TypeArguments == null)
 148                                         return false;
 149                                 else
 150                                         return TypeArguments.IsUnbound;
 151                         }
 152                 }
 153
 154                 protected bool CheckUnbound (Location loc)
 155                 {
 156                         if ((Left != null) && !Left.CheckUnbound (loc))
 157                                 return false;
 158                         if ((TypeArguments != null) && !TypeArguments.IsUnbound) {
 159                                 Report.Error (1031, loc, "Type expected");
 160                                 return false;
 161                         }
 162
 163                         return true;
 164                 }
 165
 166                 public Expression GetTypeExpression (Location loc)
 167                 {
 168                         if (IsUnbound) {
 169                                 if (!CheckUnbound (loc))
 170                                         return null;
 171
 172                                 return new UnboundTypeExpression (GetTypeName ());
 173                         }
 174
 175                         if (Left != null) {
 176                                 Expression lexpr = Left.GetTypeExpression (loc);
 177
 178                                 return new MemberAccess (lexpr, Name, TypeArguments, loc);
 179                         } else {
 180                                 if (TypeArguments != null)
 181                                         return new SimpleName (Basename, TypeArguments, loc);
 182                                 else
 183                                         return new SimpleName (Name, loc);
 184                         }
 185                 }
 186
 187                 public MemberName Clone ()
 188                 {
 189                         if (Left != null)
 190                                 return new MemberName (Left.Clone (), Name, TypeArguments);
 191                         else
 192                                 return new MemberName (Name, TypeArguments);
 193                 }
 194
 195                 public string Basename {
 196                         get {
 197                                 if (TypeArguments != null)
 198                                         return MakeName (Name, TypeArguments);
 199                                 else
 200                                         return Name;
 201                         }
 202                 }
 203
 204                 public override string ToString ()
 205                 {
 206                         string full_name;
 207                         if (TypeArguments != null)
 208                                 full_name = Name + "<" + TypeArguments + ">";
 209                         else
 210                                 full_name = Name;
 211
 212                         if (Left != null)
 213                                 return Left + "." + full_name;
 214                         else
 215                                 return full_name;
 216                 }
 217
 218                 public override bool Equals (object other)
 219                 {
 220                         return Equals (other as MemberName);
 221                 }
 222
 223                 public bool Equals (MemberName other)
 224                 {
 225                         if (this == other)
 226                                 return true;
 227                         if (other == null || Name != other.Name)
 228                                 return false;
 229
 230                         if ((TypeArguments != null) &&
 231                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 232                                 return false;
 233
 234                         if ((TypeArguments == null) && (other.TypeArguments != null))
 235                                 return false;
 236
 237                         if (Left == null)
 238                                 return other.Left == null;
 239
 240                         return Left.Equals (other.Left);
 241                 }
 242
 243                 public override int GetHashCode ()
 244                 {
 245                         int hash = Name.GetHashCode ();
 246                         for (MemberName n = Left; n != null; n = n.Left)
 247                                 hash ^= n.Name.GetHashCode ();
 248
 249                         if (TypeArguments != null)
 250                                 hash ^= TypeArguments.Count << 5;
 251
 252                         return hash & 0x7FFFFFFF;
 253                 }
 254         }
 255
 256         /// <summary>
 257         ///   Base representation for members.  This is used to keep track
 258         ///   of Name, Location and Modifier flags, and handling Attributes.
 259         /// </summary>
 260         public abstract class MemberCore : Attributable {
 261                 /// <summary>
 262                 ///   Public name
 263                 /// </summary>
 264
 265                 protected string cached_name;
 266                 public string Name {
 267                         get {
 268                                 if (cached_name == null)
 269                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 270                                 return cached_name;
 271                         }
 272                 }
 273
 274                 // Is not readonly because of IndexerName attribute
 275                 private MemberName member_name;
 276                 public MemberName MemberName {
 277                         get { return member_name; }
 278                 }
 279
 280                 /// <summary>
 281                 ///   Modifier flags that the user specified in the source code
 282                 /// </summary>
 283                 public int ModFlags;
 284
 285                 public /*readonly*/ TypeContainer Parent;
 286
 287                 /// <summary>
 288                 ///   Location where this declaration happens
 289                 /// </summary>
 290                 public readonly Location Location;
 291
 292                 /// <summary>
 293                 ///   XML documentation comment
 294                 /// </summary>
 295                 public string DocComment;
 296
 297                 /// <summary>
 298                 ///   Represents header string for documentation comment
 299                 ///   for each member types.
 300                 /// </summary>
 301                 public abstract string DocCommentHeader { get; }
 302
 303                 [Flags]
 304                 public enum Flags {
 305                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 306                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 307                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 308                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 309                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 310                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 311                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 312                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 313                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 314                         Excluded = 1 << 9,                                      // Method is conditional
 315                         TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
 316                         IsUsed = 1 << 11
 317                 }
 318
 319                 /// <summary>
 320                 ///   MemberCore flags at first detected then cached
 321                 /// </summary>
 322                 internal Flags caching_flags;
 323
 324                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs,
 325                                    Location loc)
 326                         : base (attrs)
 327                 {
 328                         if (parent is PartialContainer && !(this is PartialContainer))
 329                                 throw new InternalErrorException ("A PartialContainer cannot be the direct parent of a member");
 330
 331                         Parent = parent;
 332                         member_name = name;
 333                         Location = loc;
 334                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 335                 }
 336
 337                 protected virtual void SetMemberName (MemberName new_name)
 338                 {
 339                         member_name = new_name;
 340                         cached_name = null;
 341                 }
 342
 343                 /// <summary>
 344                 /// Tests presence of ObsoleteAttribute and report proper error
 345                 /// </summary>
 346                 protected void CheckUsageOfObsoleteAttribute (Type type)
 347                 {
 348                         if (type == null)
 349                                 return;
 350
 351                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
 352                         if (obsolete_attr == null)
 353                                 return;
 354
 355                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
 356                 }
 357
 358                 public abstract bool Define ();
 359
 360                 //
 361                 // Returns full member name for error message
 362                 //
 363                 public virtual string GetSignatureForError ()
 364                 {
 365                         return Name;
 366                 }
 367
 368                 /// <summary>
 369                 /// Use this method when MethodBuilder is null
 370                 /// </summary>
 371                 public virtual string GetSignatureForError (TypeContainer tc)
 372                 {
 373                         return Name;
 374                 }
 375
 376                 /// <summary>
 377                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 378                 /// </summary>
 379                 public virtual void Emit ()
 380                 {
 381                         // Hack with Parent == null is for EnumMember
 382                         if (Parent == null || (GetObsoleteAttribute (Parent) == null && Parent.GetObsoleteAttribute (Parent) == null))
 383                                 VerifyObsoleteAttribute ();
 384
 385                         if (!RootContext.VerifyClsCompliance)
 386                                 return;
 387
 388                         VerifyClsCompliance (Parent);
 389                 }
 390
 391                 public bool InUnsafe {
 392                         get {
 393                                 return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
 394                         }
 395                 }
 396
 397                 public virtual bool IsUsed {
 398                         get {
 399                                 return (caching_flags & Flags.IsUsed) != 0;
 400                         }
 401                 }
 402
 403                 public void SetMemberIsUsed ()
 404                 {
 405                         caching_flags |= Flags.IsUsed;
 406                 }
 407
 408                 //
 409                 // Whehter is it ok to use an unsafe pointer in this type container
 410                 //
 411                 public bool UnsafeOK (DeclSpace parent)
 412                 {
 413                         //
 414                         // First check if this MemberCore modifier flags has unsafe set
 415                         //
 416                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 417                                 return true;
 418
 419                         if (parent.UnsafeContext)
 420                                 return true;
 421
 422                         Expression.UnsafeError (Location);
 423                         return false;
 424                 }
 425
 426                 /// <summary>
 427                 /// Returns instance of ObsoleteAttribute for this MemberCore
 428                 /// </summary>
 429                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 430                 {
 431                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 432                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 433                                 return null;
 434                         }
 435
 436                         caching_flags &= ~Flags.Obsolete_Undetected;
 437
 438                         if (OptAttributes == null)
 439                                 return null;
 440
 441                         Attribute obsolete_attr = OptAttributes.Search (
 442                                 TypeManager.obsolete_attribute_type, ds.EmitContext);
 443                         if (obsolete_attr == null)
 444                                 return null;
 445
 446                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds.EmitContext);
 447                         if (obsolete == null)
 448                                 return null;
 449
 450                         caching_flags |= Flags.Obsolete;
 451                         return obsolete;
 452                 }
 453
 454                 /// <summary>
 455                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 456                 /// </summary>
 457                 public override bool IsClsCompliaceRequired (DeclSpace container)
 458                 {
 459                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 460                                 return (caching_flags & Flags.ClsCompliant) != 0;
 461
 462                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 463                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 464                                 caching_flags |= Flags.ClsCompliant;
 465                                 return true;
 466                         }
 467
 468                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 469                         return false;
 470                 }
 471
 472                 /// <summary>
 473                 /// Returns true when MemberCore is exposed from assembly.
 474                 /// </summary>
 475                 public bool IsExposedFromAssembly (DeclSpace ds)
 476                 {
 477                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 478                                 return false;
 479
 480                         DeclSpace parentContainer = ds;
 481                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 482                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 483                                         return false;
 484                                 parentContainer = parentContainer.Parent;
 485                         }
 486                         return true;
 487                 }
 488
 489                 /// <summary>
 490                 /// Resolve CLSCompliantAttribute value or gets cached value.
 491                 /// </summary>
 492                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 493                 {
 494                         if (OptAttributes != null) {
 495                                 Attribute cls_attribute = OptAttributes.Search (
 496                                         TypeManager.cls_compliant_attribute_type, ds.EmitContext);
 497                                 if (cls_attribute != null) {
 498                                         caching_flags |= Flags.HasClsCompliantAttribute;
 499                                         return cls_attribute.GetClsCompliantAttributeValue (ds.EmitContext);
 500                                 }
 501                         }
 502                         return ds.GetClsCompliantAttributeValue ();
 503                 }
 504
 505                 /// <summary>
 506                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 507                 /// </summary>
 508                 protected bool HasClsCompliantAttribute {
 509                         get {
 510                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 511                         }
 512                 }
 513
 514                 /// <summary>
 515                 /// It helps to handle error 102 & 111 detection
 516                 /// </summary>
 517                 public virtual bool MarkForDuplicationCheck ()
 518                 {
 519                         return false;
 520                 }
 521
 522                 /// <summary>
 523                 /// The main virtual method for CLS-Compliant verifications.
 524                 /// The method returns true if member is CLS-Compliant and false if member is not
 525                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 526                 /// and add their extra verifications.
 527                 /// </summary>
 528                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 529                 {
 530                         if (!IsClsCompliaceRequired (ds)) {
 531                                 if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
 532                                         if (!IsExposedFromAssembly (ds))
 533                                                 Report.Warning (3019, Location, "CLS compliance checking will not be performed on '{0}' because it is private or internal", GetSignatureForError ());
 534                                         if (!CodeGen.Assembly.IsClsCompliant)
 535                                                 Report.Warning (3021, Location, "'{0}' does not need a CLSCompliant attribute because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 536                                 }
 537                                 return false;
 538                         }
 539
 540                         if (!CodeGen.Assembly.IsClsCompliant) {
 541                                 if (HasClsCompliantAttribute) {
 542                                         Report.Error (3014, Location, "'{0}' cannot be marked as CLS-compliant because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 543                                 }
 544                                 return false;
 545                         }
 546
 547                         int index = Name.LastIndexOf ('.');
 548                         if (Name [index > 0 ? index + 1 : 0] == '_') {
 549                                 Report.Error (3008, Location, "Identifier '{0}' is not CLS-compliant", GetSignatureForError () );
 550                         }
 551                         return true;
 552                 }
 553
 554                 protected abstract void VerifyObsoleteAttribute ();
 555
 556                 //
 557                 // Raised (and passed an XmlElement that contains the comment)
 558                 // when GenerateDocComment is writing documentation expectedly.
 559                 //
 560                 internal virtual void OnGenerateDocComment (DeclSpace ds, XmlElement intermediateNode)
 561                 {
 562                 }
 563
 564                 //
 565                 // Returns a string that represents the signature for this
 566                 // member which should be used in XML documentation.
 567                 //
 568                 public virtual string GetDocCommentName (DeclSpace ds)
 569                 {
 570                         if (ds == null || this is DeclSpace)
 571                                 return DocCommentHeader + Name;
 572                         else
 573                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 574                 }
 575
 576                 //
 577                 // Generates xml doc comments (if any), and if required,
 578                 // handle warning report.
 579                 //
 580                 internal virtual void GenerateDocComment (DeclSpace ds)
 581                 {
 582                         DocUtil.GenerateDocComment (this, ds);
 583                 }
 584         }
 585
 586         /// <summary>
 587         ///   Base class for structs, classes, enumerations and interfaces.
 588         /// </summary>
 589         /// <remarks>
 590         ///   They all create new declaration spaces.  This
 591         ///   provides the common foundation for managing those name
 592         ///   spaces.
 593         /// </remarks>
 594         public abstract class DeclSpace : MemberCore, IAlias {
 595                 /// <summary>
 596                 ///   This points to the actual definition that is being
 597                 ///   created with System.Reflection.Emit
 598                 /// </summary>
 599                 public TypeBuilder TypeBuilder;
 600
 601                 /// <summary>
 602                 ///   If we are a generic type, this is the type we are
 603                 ///   currently defining.  We need to lookup members on this
 604                 ///   instead of the TypeBuilder.
 605                 /// </summary>
 606                 public Type CurrentType;
 607
 608                 //
 609                 // This is the namespace in which this typecontainer
 610                 // was declared.  We use this to resolve names.
 611                 //
 612                 public NamespaceEntry NamespaceEntry;
 613
 614                 private Hashtable Cache = new Hashtable ();
 615
 616                 public readonly string Basename;
 617
 618                 protected Hashtable defined_names;
 619
 620                 readonly bool is_generic;
 621                 readonly int count_type_params;
 622                 readonly int count_current_type_params;
 623
 624                 // The emit context for toplevel objects.
 625                 protected EmitContext ec;
 626
 627                 public EmitContext EmitContext {
 628                         get { return ec; }
 629                 }
 630
 631                 //
 632                 // Whether we are Generic
 633                 //
 634                 public bool IsGeneric {
 635                         get {
 636                                 if (is_generic)
 637                                         return true;
 638                                 else if (Parent != null)
 639                                         return Parent.IsGeneric;
 640                                 else
 641                                         return false;
 642                         }
 643                 }
 644
 645                 static string[] attribute_targets = new string [] { "type" };
 646
 647                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 648                                   Attributes attrs, Location l)
 649                         : base (parent, name, attrs, l)
 650                 {
 651                         NamespaceEntry = ns;
 652                         Basename = name.Basename;
 653                         defined_names = new Hashtable ();
 654                         if (name.TypeArguments != null) {
 655                                 is_generic = true;
 656                                 count_type_params = count_current_type_params = name.TypeArguments.Count;
 657                         }
 658                         if (parent != null)
 659                                 count_type_params += parent.count_type_params;
 660                 }
 661
 662                 /// <summary>
 663                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 664                 /// </summary>
 665                 protected bool AddToContainer (MemberCore symbol, string name)
 666                 {
 667                         if (name == Basename && !(this is Interface) && !(this is Enum)) {
 668                                 if (symbol is TypeParameter)
 669                                         Report.Error (694, "Type parameter `{0}' has same name as " +
 670                                                       "containing type or method", name);
 671                                 else {
 672                                         Report.SymbolRelatedToPreviousError (this);
 673                                         Report.Error (542, "'{0}': member names cannot be the same as their " +
 674                                                       "enclosing type", symbol.Location, symbol.GetSignatureForError ());
 675                                 }
 676                                 return false;
 677                         }
 678
 679                         MemberCore mc = (MemberCore) defined_names [name];
 680
 681                         if (mc == null) {
 682                                 defined_names.Add (name, symbol);
 683                                 return true;
 684                         }
 685
 686                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 687                                 return true;
 688
 689                         if (symbol is TypeParameter)
 690                                 Report.Error (692, symbol.Location, "Duplicate type parameter `{0}'", name);
 691                         else {
 692                                 Report.SymbolRelatedToPreviousError (mc);
 693                                 Report.Error (102, symbol.Location,
 694                                               "The type '{0}' already contains a definition for '{1}'",
 695                                               GetSignatureForError (), name);
 696                         }
 697                         return false;
 698                 }
 699
 700                 public void RecordDecl ()
 701                 {
 702                         if ((NamespaceEntry != null) && (Parent == RootContext.Tree.Types))
 703                                 NamespaceEntry.DefineName (MemberName.Basename, this);
 704                 }
 705
 706                 /// <summary>
 707                 ///   Returns the MemberCore associated with a given name in the declaration
 708                 ///   space. It doesn't return method based symbols !!
 709                 /// </summary>
 710                 ///
 711                 public MemberCore GetDefinition (string name)
 712                 {
 713                         return (MemberCore)defined_names [name];
 714                 }
 715
 716                 bool in_transit = false;
 717
 718                 /// <summary>
 719                 ///   This function is used to catch recursive definitions
 720                 ///   in declarations.
 721                 /// </summary>
 722                 public bool InTransit {
 723                         get {
 724                                 return in_transit;
 725                         }
 726
 727                         set {
 728                                 in_transit = value;
 729                         }
 730                 }
 731
 732                 //
 733                 // root_types contains all the types.  All TopLevel types
 734                 // hence have a parent that points to `root_types', that is
 735                 // why there is a non-obvious test down here.
 736                 //
 737                 public bool IsTopLevel {
 738                         get {
 739                                 if (Parent != null){
 740                                         if (Parent.Parent == null)
 741                                                 return true;
 742                                 }
 743                                 return false;
 744                         }
 745                 }
 746
 747                 public virtual void CloseType ()
 748                 {
 749                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 750                                 try {
 751                                         TypeBuilder.CreateType ();
 752                                 } catch {
 753                                         //
 754                                         // The try/catch is needed because
 755                                         // nested enumerations fail to load when they
 756                                         // are defined.
 757                                         //
 758                                         // Even if this is the right order (enumerations
 759                                         // declared after types).
 760                                         //
 761                                         // Note that this still creates the type and
 762                                         // it is possible to save it
 763                                 }
 764                                 caching_flags |= Flags.CloseTypeCreated;
 765                         }
 766                 }
 767
 768                 protected virtual TypeAttributes TypeAttr {
 769                         get {
 770                                 return CodeGen.Module.DefaultCharSetType;
 771                         }
 772                 }
 773
 774                 /// <remarks>
 775                 ///  Should be overriten by the appropriate declaration space
 776                 /// </remarks>
 777                 public abstract TypeBuilder DefineType ();
 778
 779                 /// <summary>
 780                 ///   Define all members, but don't apply any attributes or do anything which may
 781                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 782                 /// </summary>
 783                 public abstract bool DefineMembers (TypeContainer parent);
 784
 785                 //
 786                 // Whether this is an `unsafe context'
 787                 //
 788                 public bool UnsafeContext {
 789                         get {
 790                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 791                                         return true;
 792                                 if (Parent != null)
 793                                         return Parent.UnsafeContext;
 794                                 return false;
 795                         }
 796                 }
 797
 798                 EmitContext type_resolve_ec;
 799                 protected EmitContext TypeResolveEmitContext {
 800                         get {
 801                                 if (type_resolve_ec == null) {
 802                                         // FIXME: I think this should really be one of:
 803                                         //
 804                                         // a. type_resolve_ec = Parent.EmitContext;
 805                                         // b. type_resolve_ec = new EmitContext (Parent, Parent, loc, null, null, ModFlags, false);
 806                                         //
 807                                         // However, if Parent == RootContext.Tree.Types, its NamespaceEntry will be null.
 808                                         //
 809                                         type_resolve_ec = new EmitContext (Parent, this, Location.Null, null, null, ModFlags, false);
 810                                 }
 811                                 return type_resolve_ec;
 812                         }
 813                 }
 814
 815                 // <summary>
 816                 //    Resolves the expression `e' for a type, and will recursively define
 817                 //    types.  This should only be used for resolving base types.
 818                 // </summary>
 819                 public TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
 820                 {
 821                         TypeResolveEmitContext.loc = loc;
 822                         TypeResolveEmitContext.ContainerType = TypeBuilder;
 823                         if (this is GenericMethod)
 824                                 TypeResolveEmitContext.ContainerType = Parent.TypeBuilder;
 825                         else
 826                                 TypeResolveEmitContext.ContainerType = TypeBuilder;
 827
 828                         return e.ResolveAsTypeTerminal (TypeResolveEmitContext);
 829                 }
 830
 831                 public bool CheckAccessLevel (Type check_type)
 832                 {
 833                         TypeBuilder tb;
 834                         if ((this is GenericMethod) || (this is Iterator))
 835                                 tb = Parent.TypeBuilder;
 836                         else
 837                                 tb = TypeBuilder;
 838
 839                         if (check_type.IsGenericInstance)
 840                                 check_type = check_type.GetGenericTypeDefinition ();
 841
 842                         if (check_type == tb)
 843                                 return true;
 844
 845                         if (TypeBuilder == null)
 846                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 847                                 //        However, this is invoked again later -- so safe to return true.
 848                                 //        May also be null when resolving top-level attributes.
 849                                 return true;
 850
 851                         if (check_type.IsGenericParameter)
 852                                 return true; // FIXME
 853
 854                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 855
 856                         //
 857                         // Broken Microsoft runtime, return public for arrays, no matter what
 858                         // the accessibility is for their underlying class, and they return
 859                         // NonPublic visibility for pointers
 860                         //
 861                         if (check_type.IsArray || check_type.IsPointer)
 862                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 863
 864                         switch (check_attr){
 865                         case TypeAttributes.Public:
 866                                 return true;
 867
 868                         case TypeAttributes.NotPublic:
 869
 870                                 if (TypeBuilder == null)
 871                                         // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 872                                         //        However, this is invoked again later -- so safe to return true.
 873                                         //        May also be null when resolving top-level attributes.
 874                                         return true;
 875                                 //
 876                                 // This test should probably use the declaringtype.
 877                                 //
 878                                 return check_type.Assembly == TypeBuilder.Assembly;
 879
 880                         case TypeAttributes.NestedPublic:
 881                                 return true;
 882
 883                         case TypeAttributes.NestedPrivate:
 884                                 return NestedAccessible (tb, check_type);
 885
 886                         case TypeAttributes.NestedFamily:
 887                                 //
 888                                 // Only accessible to methods in current type or any subtypes
 889                                 //
 890                                 return FamilyAccessible (tb, check_type);
 891
 892                         case TypeAttributes.NestedFamANDAssem:
 893                                 return (check_type.Assembly == tb.Assembly) &&
 894                                         FamilyAccessible (tb, check_type);
 895
 896                         case TypeAttributes.NestedFamORAssem:
 897                                 return (check_type.Assembly == tb.Assembly) ||
 898                                         FamilyAccessible (tb, check_type);
 899
 900                         case TypeAttributes.NestedAssembly:
 901                                 return check_type.Assembly == tb.Assembly;
 902                         }
 903
 904                         Console.WriteLine ("HERE: " + check_attr);
 905                         return false;
 906
 907                 }
 908
 909                 protected bool NestedAccessible (Type tb, Type check_type)
 910                 {
 911                         Type declaring = check_type.DeclaringType;
 912                         return TypeBuilder == declaring ||
 913                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 914                 }
 915
 916                 protected bool FamilyAccessible (Type tb, Type check_type)
 917                 {
 918                         Type declaring = check_type.DeclaringType;
 919                         if (tb == declaring || TypeManager.IsFamilyAccessible (tb, declaring))
 920                                 return true;
 921
 922                         return NestedAccessible (tb, check_type);
 923                 }
 924
 925                 // Access level of a type.
 926                 const int X = 1;
 927                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 928                         // Public    Assembly   Protected
 929                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 930                         Public              = (X << 0) | (X << 1) | (X << 2),
 931                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 932                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 933                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 934                 }
 935
 936                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 937                 {
 938                         if ((flags & Modifiers.INTERNAL) != 0) {
 939
 940                                 if ((flags & Modifiers.PROTECTED) != 0)
 941                                         return AccessLevel.ProtectedOrInternal;
 942                                 else
 943                                         return AccessLevel.Internal;
 944
 945                         } else if ((flags & Modifiers.PROTECTED) != 0)
 946                                 return AccessLevel.Protected;
 947                         else if ((flags & Modifiers.PRIVATE) != 0)
 948                                 return AccessLevel.Private;
 949                         else
 950                                 return AccessLevel.Public;
 951                 }
 952
 953                 // What is the effective access level of this?
 954                 // TODO: Cache this?
 955                 AccessLevel EffectiveAccessLevel {
 956                         get {
 957                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 958                                 if (!IsTopLevel && (Parent != null))
 959                                         return myAccess & Parent.EffectiveAccessLevel;
 960                                 return myAccess;
 961                         }
 962                 }
 963
 964                 // Return the access level for type `t'
 965                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 966                 {
 967                         if (t.IsPublic)
 968                                 return AccessLevel.Public;
 969                         if (t.IsNestedPrivate)
 970                                 return AccessLevel.Private;
 971                         if (t.IsNotPublic)
 972                                 return AccessLevel.Internal;
 973
 974                         // By now, it must be nested
 975                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
 976
 977                         if (t.IsNestedPublic)
 978                                 return parentLevel;
 979                         if (t.IsNestedAssembly)
 980                                 return parentLevel & AccessLevel.Internal;
 981                         if (t.IsNestedFamily)
 982                                 return parentLevel & AccessLevel.Protected;
 983                         if (t.IsNestedFamORAssem)
 984                                 return parentLevel & AccessLevel.ProtectedOrInternal;
 985                         if (t.IsNestedFamANDAssem)
 986                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 987
 988                         // nested private is taken care of
 989
 990                         throw new Exception ("I give up, what are you?");
 991                 }
 992
 993                 //
 994                 // This answers `is the type P, as accessible as a member M which has the
 995                 // accessability @flags which is declared as a nested member of the type T, this declspace'
 996                 //
 997                 public bool AsAccessible (Type p, int flags)
 998                 {
 999                         if (p.IsGenericParameter)
1000                                 return true; // FIXME
1001
1002                         //
1003                         // 1) if M is private, its accessability is the same as this declspace.
1004                         // we already know that P is accessible to T before this method, so we
1005                         // may return true.
1006                         //
1007
1008                         if ((flags & Modifiers.PRIVATE) != 0)
1009                                 return true;
1010
1011                         while (p.IsArray || p.IsPointer || p.IsByRef)
1012                                 p = TypeManager.GetElementType (p);
1013
1014                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
1015                         AccessLevel mAccess = this.EffectiveAccessLevel &
1016                                 GetAccessLevelFromModifiers (flags);
1017
1018                         // for every place from which we can access M, we must
1019                         // be able to access P as well. So, we want
1020                         // For every bit in M and P, M_i -> P_1 == true
1021                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
1022
1023                         return ~ (~ mAccess | pAccess) == 0;
1024                 }
1025
1026                 public static void Error_AmbiguousTypeReference (Location loc, string name, string t1, string t2)
1027                 {
1028                         Report.Error (104, loc,
1029                                       "`{0}' is an ambiguous reference ({1} or {2})",
1030                                       name, t1, t2);
1031                 }
1032
1033                 //
1034                 // Return the nested type with name @name.  Ensures that the nested type
1035                 // is defined if necessary.  Do _not_ use this when you have a MemberCache handy.
1036                 //
1037                 public virtual Type FindNestedType (string name)
1038                 {
1039                         return null;
1040                 }
1041
1042                 private Type LookupNestedTypeInHierarchy (string name)
1043                 {
1044                         // if the member cache has been created, lets use it.
1045                         // the member cache is MUCH faster.
1046                         if (MemberCache != null)
1047                                 return MemberCache.FindNestedType (name);
1048
1049                         // no member cache. Do it the hard way -- reflection
1050                         Type t = null;
1051                         for (Type current_type = TypeBuilder;
1052                              current_type != null && current_type != TypeManager.object_type;
1053                              current_type = current_type.BaseType) {
1054                                 if (current_type is TypeBuilder) {
1055                                         DeclSpace decl = this;
1056                                         if (current_type != TypeBuilder)
1057                                                 decl = TypeManager.LookupDeclSpace (current_type);
1058                                         t = decl.FindNestedType (name);
1059                                 } else {
1060                                         t = TypeManager.GetNestedType (current_type, name);
1061                                 }
1062
1063                                 if (t != null && CheckAccessLevel (t))
1064                                         return t;
1065                         }
1066
1067                         return null;
1068                 }
1069
1070                 //
1071                 // Public function used to locate types, this can only
1072                 // be used after the ResolveTree function has been invoked.
1073                 //
1074                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1075                 //
1076                 // Returns: Type or null if they type can not be found.
1077                 //
1078                 public FullNamedExpression LookupType (string name, Location loc, bool ignore_cs0104)
1079                 {
1080                         if (this is PartialContainer)
1081                                 throw new InternalErrorException ("Should not get here");
1082
1083                         if (Cache.Contains (name))
1084                                 return (FullNamedExpression) Cache [name];
1085
1086                         FullNamedExpression e;
1087                         Type t = LookupNestedTypeInHierarchy (name);
1088                         if (t != null)
1089                                 e = new TypeExpression (t, Location.Null);
1090                         else if (Parent != null && Parent != RootContext.Tree.Types)
1091                                 e = Parent.LookupType (name, loc, ignore_cs0104);
1092                         else
1093                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
1094
1095                         Cache [name] = e;
1096                         return e;
1097                 }
1098
1099                 /// <remarks>
1100                 ///   This function is broken and not what you're looking for.  It should only
1101                 ///   be used while the type is still being created since it doesn't use the cache
1102                 ///   and relies on the filter doing the member name check.
1103                 /// </remarks>
1104                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1105                                                         MemberFilter filter, object criteria);
1106
1107                 /// <remarks>
1108                 ///   If we have a MemberCache, return it.  This property may return null if the
1109                 ///   class doesn't have a member cache or while it's still being created.
1110                 /// </remarks>
1111                 public abstract MemberCache MemberCache {
1112                         get;
1113                 }
1114
1115                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1116                 {
1117                         if (a.Type == TypeManager.required_attr_type) {
1118                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1119                                 return;
1120                         }
1121                         TypeBuilder.SetCustomAttribute (cb);
1122                 }
1123
1124                 /// <summary>
1125                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
1126                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
1127                 /// </summary>
1128                 public bool GetClsCompliantAttributeValue ()
1129                 {
1130                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
1131                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
1132
1133                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
1134
1135                         if (OptAttributes != null) {
1136                                 Attribute cls_attribute = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, ec);
1137                                 if (cls_attribute != null) {
1138                                         caching_flags |= Flags.HasClsCompliantAttribute;
1139                                         if (cls_attribute.GetClsCompliantAttributeValue (ec)) {
1140                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1141                                                 return true;
1142                                         }
1143                                         return false;
1144                                 }
1145                         }
1146
1147                         if (Parent == null) {
1148                                 if (CodeGen.Assembly.IsClsCompliant) {
1149                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
1150                                         return true;
1151                                 }
1152                                 return false;
1153                         }
1154
1155                         if (Parent.GetClsCompliantAttributeValue ()) {
1156                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1157                                 return true;
1158                         }
1159                         return false;
1160                 }
1161
1162                 //
1163                 // Extensions for generics
1164                 //
1165                 TypeParameter[] type_params;
1166                 TypeParameter[] type_param_list;
1167
1168                 protected string GetInstantiationName ()
1169                 {
1170                         StringBuilder sb = new StringBuilder (Name);
1171                         sb.Append ("<");
1172                         for (int i = 0; i < type_param_list.Length; i++) {
1173                                 if (i > 0)
1174                                         sb.Append (",");
1175                                 sb.Append (type_param_list [i].Name);
1176                         }
1177                         sb.Append (">");
1178                         return sb.ToString ();
1179                 }
1180
1181                 bool check_type_parameter (ArrayList list, int start, string name)
1182                 {
1183                         for (int i = 0; i < start; i++) {
1184                                 TypeParameter param = (TypeParameter) list [i];
1185
1186                                 if (param.Name != name)
1187                                         continue;
1188
1189                                 if (RootContext.WarningLevel >= 3)
1190                                         Report.Warning (
1191                                                 693, Location,
1192                                                 "Type parameter `{0}' has same name " +
1193                                                 "as type parameter from outer type `{1}'",
1194                                                 name, Parent.GetInstantiationName ());
1195
1196                                 return false;
1197                         }
1198
1199                         return true;
1200                 }
1201
1202                 TypeParameter[] initialize_type_params ()
1203                 {
1204                         if (type_param_list != null)
1205                                 return type_param_list;
1206
1207                         DeclSpace the_parent = Parent;
1208                         if (this is GenericMethod)
1209                                 the_parent = null;
1210
1211                         int start = 0;
1212                         TypeParameter[] parent_params = null;
1213                         if ((the_parent != null) && the_parent.IsGeneric) {
1214                                 parent_params = the_parent.initialize_type_params ();
1215                                 start = parent_params != null ? parent_params.Length : 0;
1216                         }
1217
1218                         ArrayList list = new ArrayList ();
1219                         if (parent_params != null)
1220                                 list.AddRange (parent_params);
1221
1222                         int count = type_params != null ? type_params.Length : 0;
1223                         for (int i = 0; i < count; i++) {
1224                                 TypeParameter param = type_params [i];
1225                                 check_type_parameter (list, start, param.Name);
1226                                 list.Add (param);
1227                         }
1228
1229                         type_param_list = new TypeParameter [list.Count];
1230                         list.CopyTo (type_param_list, 0);
1231                         return type_param_list;
1232                 }
1233
1234                 public virtual void SetParameterInfo (ArrayList constraints_list)
1235                 {
1236                         if (!is_generic) {
1237                                 if (constraints_list != null) {
1238                                         Report.Error (
1239                                                 80, Location, "Contraints are not allowed " +
1240                                                 "on non-generic declarations");
1241                                 }
1242
1243                                 return;
1244                         }
1245
1246                         string[] names = MemberName.TypeArguments.GetDeclarations ();
1247                         type_params = new TypeParameter [names.Length];
1248
1249                         //
1250                         // Register all the names
1251                         //
1252                         for (int i = 0; i < type_params.Length; i++) {
1253                                 string name = names [i];
1254
1255                                 Constraints constraints = null;
1256                                 if (constraints_list != null) {
1257                                         foreach (Constraints constraint in constraints_list) {
1258                                                 if (constraint.TypeParameter == name) {
1259                                                         constraints = constraint;
1260                                                         break;
1261                                                 }
1262                                         }
1263                                 }
1264
1265                                 type_params [i] = new TypeParameter (Parent, name, constraints, Location);
1266
1267                                 AddToContainer (type_params [i], name);
1268                         }
1269                 }
1270
1271                 public TypeParameter[] TypeParameters {
1272                         get {
1273                                 if (!IsGeneric)
1274                                         throw new InvalidOperationException ();
1275                                 if (type_param_list == null)
1276                                         initialize_type_params ();
1277
1278                                 return type_param_list;
1279                         }
1280                 }
1281
1282                 protected TypeParameter[] CurrentTypeParameters {
1283                         get {
1284                                 if (!IsGeneric)
1285                                         throw new InvalidOperationException ();
1286                                 if (type_params != null)
1287                                         return type_params;
1288                                 else
1289                                         return new TypeParameter [0];
1290                         }
1291                 }
1292
1293                 public int CountTypeParameters {
1294                         get {
1295                                 return count_type_params;
1296                         }
1297                 }
1298
1299                 public int CountCurrentTypeParameters {
1300                         get {
1301                                 return count_current_type_params;
1302                         }
1303                 }
1304
1305                 public TypeParameterExpr LookupGeneric (string name, Location loc)
1306                 {
1307                         if (!IsGeneric)
1308                                 return null;
1309
1310                         foreach (TypeParameter type_param in CurrentTypeParameters) {
1311                                 if (type_param.Name != name)
1312                                         continue;
1313
1314                                 return new TypeParameterExpr (type_param, loc);
1315                         }
1316
1317                         if (Parent != null)
1318                                 return Parent.LookupGeneric (name, loc);
1319
1320                         return null;
1321                 }
1322
1323                 bool IAlias.IsType {
1324                         get { return true; }
1325                 }
1326
1327                 string IAlias.Name {
1328                         get { return Name; }
1329                 }
1330
1331                 TypeExpr IAlias.ResolveAsType (EmitContext ec)
1332                 {
1333                         if (TypeBuilder == null)
1334                                 throw new InvalidOperationException ();
1335
1336                         if (CurrentType != null)
1337                                 return new TypeExpression (CurrentType, Location);
1338                         else
1339                                 return new TypeExpression (TypeBuilder, Location);
1340                 }
1341
1342                 public override string[] ValidAttributeTargets {
1343                         get {
1344                                 return attribute_targets;
1345                         }
1346                 }
1347         }
1348
1349         /// <summary>
1350         ///   This is a readonly list of MemberInfo's.
1351         /// </summary>
1352         public class MemberList : IList {
1353                 public readonly IList List;
1354                 int count;
1355
1356                 /// <summary>
1357                 ///   Create a new MemberList from the given IList.
1358                 /// </summary>
1359                 public MemberList (IList list)
1360                 {
1361                         if (list != null)
1362                                 this.List = list;
1363                         else
1364                                 this.List = new ArrayList ();
1365                         count = List.Count;
1366                 }
1367
1368                 /// <summary>
1369                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1370                 /// </summary>
1371                 public MemberList (IList first, IList second)
1372                 {
1373                         ArrayList list = new ArrayList ();
1374                         list.AddRange (first);
1375                         list.AddRange (second);
1376                         count = list.Count;
1377                         List = list;
1378                 }
1379
1380                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1381
1382                 /// <summary>
1383                 ///   Cast the MemberList into a MemberInfo[] array.
1384                 /// </summary>
1385                 /// <remarks>
1386                 ///   This is an expensive operation, only use it if it's really necessary.
1387                 /// </remarks>
1388                 public static explicit operator MemberInfo [] (MemberList list)
1389                 {
1390                         Timer.StartTimer (TimerType.MiscTimer);
1391                         MemberInfo [] result = new MemberInfo [list.Count];
1392                         list.CopyTo (result, 0);
1393                         Timer.StopTimer (TimerType.MiscTimer);
1394                         return result;
1395                 }
1396
1397                 // ICollection
1398
1399                 public int Count {
1400                         get {
1401                                 return count;
1402                         }
1403                 }
1404
1405                 public bool IsSynchronized {
1406                         get {
1407                                 return List.IsSynchronized;
1408                         }
1409                 }
1410
1411                 public object SyncRoot {
1412                         get {
1413                                 return List.SyncRoot;
1414                         }
1415                 }
1416
1417                 public void CopyTo (Array array, int index)
1418                 {
1419                         List.CopyTo (array, index);
1420                 }
1421
1422                 // IEnumerable
1423
1424                 public IEnumerator GetEnumerator ()
1425                 {
1426                         return List.GetEnumerator ();
1427                 }
1428
1429                 // IList
1430
1431                 public bool IsFixedSize {
1432                         get {
1433                                 return true;
1434                         }
1435                 }
1436
1437                 public bool IsReadOnly {
1438                         get {
1439                                 return true;
1440                         }
1441                 }
1442
1443                 object IList.this [int index] {
1444                         get {
1445                                 return List [index];
1446                         }
1447
1448                         set {
1449                                 throw new NotSupportedException ();
1450                         }
1451                 }
1452
1453                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1454                 public MemberInfo this [int index] {
1455                         get {
1456                                 return (MemberInfo) List [index];
1457                         }
1458                 }
1459
1460                 public int Add (object value)
1461                 {
1462                         throw new NotSupportedException ();
1463                 }
1464
1465                 public void Clear ()
1466                 {
1467                         throw new NotSupportedException ();
1468                 }
1469
1470                 public bool Contains (object value)
1471                 {
1472                         return List.Contains (value);
1473                 }
1474
1475                 public int IndexOf (object value)
1476                 {
1477                         return List.IndexOf (value);
1478                 }
1479
1480                 public void Insert (int index, object value)
1481                 {
1482                         throw new NotSupportedException ();
1483                 }
1484
1485                 public void Remove (object value)
1486                 {
1487                         throw new NotSupportedException ();
1488                 }
1489
1490                 public void RemoveAt (int index)
1491                 {
1492                         throw new NotSupportedException ();
1493                 }
1494         }
1495
1496         /// <summary>
1497         ///   This interface is used to get all members of a class when creating the
1498         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1499         ///   want to support the member cache and by TypeHandle to get caching of
1500         ///   non-dynamic types.
1501         /// </summary>
1502         public interface IMemberContainer {
1503                 /// <summary>
1504                 ///   The name of the IMemberContainer.  This is only used for
1505                 ///   debugging purposes.
1506                 /// </summary>
1507                 string Name {
1508                         get;
1509                 }
1510
1511                 /// <summary>
1512                 ///   The type of this IMemberContainer.
1513                 /// </summary>
1514                 Type Type {
1515                         get;
1516                 }
1517
1518                 /// <summary>
1519                 ///   Returns the IMemberContainer of the base class or null if this
1520                 ///   is an interface or TypeManger.object_type.
1521                 ///   This is used when creating the member cache for a class to get all
1522                 ///   members from the base class.
1523                 /// </summary>
1524                 MemberCache BaseCache {
1525                         get;
1526                 }
1527
1528                 /// <summary>
1529                 ///   Whether this is an interface.
1530                 /// </summary>
1531                 bool IsInterface {
1532                         get;
1533                 }
1534
1535                 /// <summary>
1536                 ///   Returns all members of this class with the corresponding MemberTypes
1537                 ///   and BindingFlags.
1538                 /// </summary>
1539                 /// <remarks>
1540                 ///   When implementing this method, make sure not to return any inherited
1541                 ///   members and check the MemberTypes and BindingFlags properly.
1542                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1543                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1544                 ///   MemberInfo class, but the cache needs this information.  That's why
1545                 ///   this method is called multiple times with different BindingFlags.
1546                 /// </remarks>
1547                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1548
1549                 /// <summary>
1550                 ///   Return the container's member cache.
1551                 /// </summary>
1552                 MemberCache MemberCache {
1553                         get;
1554                 }
1555         }
1556
1557         /// <summary>
1558         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1559         ///   member lookups.  It has a member name based hash table; it maps each member
1560         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1561         ///   and the BindingFlags that were initially used to get it.  The cache contains
1562         ///   all members of the current class and all inherited members.  If this cache is
1563         ///   for an interface types, it also contains all inherited members.
1564         ///
1565         ///   There are two ways to get a MemberCache:
1566         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1567         ///     use the DeclSpace.MemberCache property.
1568         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1569         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1570         /// </summary>
1571         public class MemberCache {
1572                 public readonly IMemberContainer Container;
1573                 protected Hashtable member_hash;
1574                 protected Hashtable method_hash;
1575
1576                 /// <summary>
1577                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1578                 /// </summary>
1579                 public MemberCache (IMemberContainer container)
1580                 {
1581                         this.Container = container;
1582
1583                         Timer.IncrementCounter (CounterType.MemberCache);
1584                         Timer.StartTimer (TimerType.CacheInit);
1585
1586                         // If we have a base class (we have a base class unless we're
1587                         // TypeManager.object_type), we deep-copy its MemberCache here.
1588                         if (Container.BaseCache != null)
1589                                 member_hash = SetupCache (Container.BaseCache);
1590                         else
1591                                 member_hash = new Hashtable ();
1592
1593                         // If this is neither a dynamic type nor an interface, create a special
1594                         // method cache with all declared and inherited methods.
1595                         Type type = container.Type;
1596                         if (!(type is TypeBuilder) && !type.IsInterface &&
1597                             // !(type.IsGenericInstance && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
1598                             !type.IsGenericInstance &&
1599                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1600                                 method_hash = new Hashtable ();
1601                                 AddMethods (type);
1602                         }
1603
1604                         // Add all members from the current class.
1605                         AddMembers (Container);
1606
1607                         Timer.StopTimer (TimerType.CacheInit);
1608                 }
1609
1610                 public MemberCache (Type[] ifaces)
1611                 {
1612                         //
1613                         // The members of this cache all belong to other caches.
1614                         // So, 'Container' will not be used.
1615                         //
1616                         this.Container = null;
1617
1618                         member_hash = new Hashtable ();
1619                         if (ifaces == null)
1620                                 return;
1621
1622                         foreach (Type itype in ifaces)
1623                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1624                 }
1625
1626                 /// <summary>
1627                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1628                 /// </summary>
1629                 Hashtable SetupCache (MemberCache base_class)
1630                 {
1631                         Hashtable hash = new Hashtable ();
1632
1633                         if (base_class == null)
1634                                 return hash;
1635
1636                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1637                         while (it.MoveNext ()) {
1638                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1639                          }
1640
1641                         return hash;
1642                 }
1643
1644                 void ClearDeclaredOnly (Hashtable hash)
1645                 {
1646                         IDictionaryEnumerator it = hash.GetEnumerator ();
1647                         while (it.MoveNext ()) {
1648                                 foreach (CacheEntry ce in (ArrayList) it.Value)
1649                                         ce.EntryType &= ~EntryType.Declared;
1650                         }
1651                 }
1652
1653                 /// <summary>
1654                 ///   Add the contents of `cache' to the member_hash.
1655                 /// </summary>
1656                 void AddCacheContents (MemberCache cache)
1657                 {
1658                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1659                         while (it.MoveNext ()) {
1660                                 ArrayList list = (ArrayList) member_hash [it.Key];
1661                                 if (list == null)
1662                                         member_hash [it.Key] = list = new ArrayList ();
1663
1664                                 ArrayList entries = (ArrayList) it.Value;
1665                                 for (int i = entries.Count-1; i >= 0; i--) {
1666                                         CacheEntry entry = (CacheEntry) entries [i];
1667
1668                                         if (entry.Container != cache.Container)
1669                                                 break;
1670                                         list.Add (entry);
1671                                 }
1672                         }
1673                 }
1674
1675                 /// <summary>
1676                 ///   Add all members from class `container' to the cache.
1677                 /// </summary>
1678                 void AddMembers (IMemberContainer container)
1679                 {
1680                         // We need to call AddMembers() with a single member type at a time
1681                         // to get the member type part of CacheEntry.EntryType right.
1682                         if (!container.IsInterface) {
1683                         AddMembers (MemberTypes.Constructor, container);
1684                         AddMembers (MemberTypes.Field, container);
1685                         }
1686                         AddMembers (MemberTypes.Method, container);
1687                         AddMembers (MemberTypes.Property, container);
1688                         AddMembers (MemberTypes.Event, container);
1689                         // Nested types are returned by both Static and Instance searches.
1690                         AddMembers (MemberTypes.NestedType,
1691                                     BindingFlags.Static | BindingFlags.Public, container);
1692                         AddMembers (MemberTypes.NestedType,
1693                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1694                 }
1695
1696                 void AddMembers (MemberTypes mt, IMemberContainer container)
1697                 {
1698                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1699                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1700                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1701                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1702                 }
1703
1704                 /// <summary>
1705                 ///   Add all members from class `container' with the requested MemberTypes and
1706                 ///   BindingFlags to the cache.  This method is called multiple times with different
1707                 ///   MemberTypes and BindingFlags.
1708                 /// </summary>
1709                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1710                 {
1711                         MemberList members = container.GetMembers (mt, bf);
1712
1713                         foreach (MemberInfo member in members) {
1714                                 string name = member.Name;
1715
1716                                 int pos = name.IndexOf ('<');
1717                                 if (pos > 0)
1718                                         name = name.Substring (0, pos);
1719
1720                                 // We use a name-based hash table of ArrayList's.
1721                                 ArrayList list = (ArrayList) member_hash [name];
1722                                 if (list == null) {
1723                                         list = new ArrayList ();
1724                                         member_hash.Add (name, list);
1725                                 }
1726
1727                                 // When this method is called for the current class, the list will
1728                                 // already contain all inherited members from our base classes.
1729                                 // We cannot add new members in front of the list since this'd be an
1730                                 // expensive operation, that's why the list is sorted in reverse order
1731                                 // (ie. members from the current class are coming last).
1732                                 list.Add (new CacheEntry (container, member, mt, bf));
1733                         }
1734                 }
1735
1736                 /// <summary>
1737                 ///   Add all declared and inherited methods from class `type' to the method cache.
1738                 /// </summary>
1739                 void AddMethods (Type type)
1740                 {
1741                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1742                                     BindingFlags.FlattenHierarchy, type);
1743                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1744                                     BindingFlags.FlattenHierarchy, type);
1745                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1746                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1747                 }
1748
1749                 void AddMethods (BindingFlags bf, Type type)
1750                 {
1751                         //
1752                         // Consider the case:
1753                         //
1754                         //   class X { public virtual int f() {} }
1755                         //   class Y : X {}
1756                         //
1757                         // When processing 'Y', the method_cache will already have a copy of 'f',
1758                         // with ReflectedType == X.  However, we want to ensure that its ReflectedType == Y
1759                         //
1760                         MethodBase [] members = type.GetMethods (bf);
1761
1762                         Array.Reverse (members);
1763
1764                         foreach (MethodBase member in members) {
1765                                 string name = member.Name;
1766
1767                                 // We use a name-based hash table of ArrayList's.
1768                                 ArrayList list = (ArrayList) method_hash [name];
1769                                 if (list == null) {
1770                                         list = new ArrayList ();
1771                                         method_hash.Add (name, list);
1772                                 }
1773
1774                                 MethodInfo curr = (MethodInfo) member;
1775                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1776                                         MethodInfo base_method = curr.GetBaseDefinition ();
1777
1778                                         if (base_method == curr) {
1779                                                 //
1780                                                 // Both mcs and CSC 1.1 seem to emit a somewhat broken
1781                                                 // ...Invoke () function for delegates: it's missing a 'newslot'.
1782                                                 // CSC 2.0 emits a 'newslot' for a delegate's Invoke.
1783                                                 //
1784                                                 // Also, CSC 1.1 appears to emit 'Finalize' without a newslot.
1785                                                 //
1786                                                 if ((member.Name != "Invoke" ||
1787                                                      !TypeManager.IsDelegateType (type)) &&
1788                                                     (member.Name != "Finalize" ||
1789                                                      type != TypeManager.object_type)) {
1790                                                         Report.SymbolRelatedToPreviousError (base_method);
1791                                                         Report.Warning (-28,
1792                                                                 "The method '{0}' is marked 'override'," +
1793                                                                 " but doesn't appear to override any virtual or abstract method:" +
1794                                                                 " it may be ignored during overload resolution",
1795                                                                 TypeManager.CSharpSignature (base_method));
1796                                                 }
1797
1798                                                 break;
1799                                         }
1800
1801                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1802                                         curr = base_method;
1803                                 }
1804
1805                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1806                                 // sorted so we need to do this check for every member.
1807                                 BindingFlags new_bf = bf;
1808                                 if (member.DeclaringType == type)
1809                                         new_bf |= BindingFlags.DeclaredOnly;
1810
1811                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1812                         }
1813                 }
1814
1815                 /// <summary>
1816                 ///   Compute and return a appropriate `EntryType' magic number for the given
1817                 ///   MemberTypes and BindingFlags.
1818                 /// </summary>
1819                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1820                 {
1821                         EntryType type = EntryType.None;
1822
1823                         if ((mt & MemberTypes.Constructor) != 0)
1824                                 type |= EntryType.Constructor;
1825                         if ((mt & MemberTypes.Event) != 0)
1826                                 type |= EntryType.Event;
1827                         if ((mt & MemberTypes.Field) != 0)
1828                                 type |= EntryType.Field;
1829                         if ((mt & MemberTypes.Method) != 0)
1830                                 type |= EntryType.Method;
1831                         if ((mt & MemberTypes.Property) != 0)
1832                                 type |= EntryType.Property;
1833                         // Nested types are returned by static and instance searches.
1834                         if ((mt & MemberTypes.NestedType) != 0)
1835                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1836
1837                         if ((bf & BindingFlags.Instance) != 0)
1838                                 type |= EntryType.Instance;
1839                         if ((bf & BindingFlags.Static) != 0)
1840                                 type |= EntryType.Static;
1841                         if ((bf & BindingFlags.Public) != 0)
1842                                 type |= EntryType.Public;
1843                         if ((bf & BindingFlags.NonPublic) != 0)
1844                                 type |= EntryType.NonPublic;
1845                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1846                                 type |= EntryType.Declared;
1847
1848                         return type;
1849                 }
1850
1851                 /// <summary>
1852                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1853                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1854                 ///   single member types.
1855                 /// </summary>
1856                 public static bool IsSingleMemberType (MemberTypes mt)
1857                 {
1858                         switch (mt) {
1859                         case MemberTypes.Constructor:
1860                         case MemberTypes.Event:
1861                         case MemberTypes.Field:
1862                         case MemberTypes.Method:
1863                         case MemberTypes.Property:
1864                         case MemberTypes.NestedType:
1865                                 return true;
1866
1867                         default:
1868                                 return false;
1869                         }
1870                 }
1871
1872                 /// <summary>
1873                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1874                 ///   number to speed up the searching process.
1875                 /// </summary>
1876                 [Flags]
1877                 protected enum EntryType {
1878                         None            = 0x000,
1879
1880                         Instance        = 0x001,
1881                         Static          = 0x002,
1882                         MaskStatic      = Instance|Static,
1883
1884                         Public          = 0x004,
1885                         NonPublic       = 0x008,
1886                         MaskProtection  = Public|NonPublic,
1887
1888                         Declared        = 0x010,
1889
1890                         Constructor     = 0x020,
1891                         Event           = 0x040,
1892                         Field           = 0x080,
1893                         Method          = 0x100,
1894                         Property        = 0x200,
1895                         NestedType      = 0x400,
1896
1897                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1898                 }
1899
1900                 protected class CacheEntry {
1901                         public readonly IMemberContainer Container;
1902                         public EntryType EntryType;
1903                         public MemberInfo Member;
1904
1905                         public CacheEntry (IMemberContainer container, MemberInfo member,
1906                                            MemberTypes mt, BindingFlags bf)
1907                         {
1908                                 this.Container = container;
1909                                 this.Member = member;
1910                                 this.EntryType = GetEntryType (mt, bf);
1911                         }
1912
1913                         public override string ToString ()
1914                         {
1915                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1916                                                       EntryType, Member);
1917                         }
1918                 }
1919
1920                 /// <summary>
1921                 ///   This is called each time we're walking up one level in the class hierarchy
1922                 ///   and checks whether we can abort the search since we've already found what
1923                 ///   we were looking for.
1924                 /// </summary>
1925                 protected bool DoneSearching (ArrayList list)
1926                 {
1927                         //
1928                         // We've found exactly one member in the current class and it's not
1929                         // a method or constructor.
1930                         //
1931                         if (list.Count == 1 && !(list [0] is MethodBase))
1932                                 return true;
1933
1934                         //
1935                         // Multiple properties: we query those just to find out the indexer
1936                         // name
1937                         //
1938                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1939                                 return true;
1940
1941                         return false;
1942                 }
1943
1944                 /// <summary>
1945                 ///   Looks up members with name `name'.  If you provide an optional
1946                 ///   filter function, it'll only be called with members matching the
1947                 ///   requested member name.
1948                 ///
1949                 ///   This method will try to use the cache to do the lookup if possible.
1950                 ///
1951                 ///   Unlike other FindMembers implementations, this method will always
1952                 ///   check all inherited members - even when called on an interface type.
1953                 ///
1954                 ///   If you know that you're only looking for methods, you should use
1955                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1956                 ///   When doing a method-only search, it'll try to use a special method
1957                 ///   cache (unless it's a dynamic type or an interface) and the returned
1958                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1959                 ///   The lookup process will automatically restart itself in method-only
1960                 ///   search mode if it discovers that it's about to return methods.
1961                 /// </summary>
1962                 ArrayList global = new ArrayList ();
1963                 bool using_global = false;
1964
1965                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1966
1967                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1968                                                MemberFilter filter, object criteria)
1969                 {
1970                         if (using_global)
1971                                 throw new Exception ();
1972
1973                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1974                         bool method_search = mt == MemberTypes.Method;
1975                         // If we have a method cache and we aren't already doing a method-only search,
1976                         // then we restart a method search if the first match is a method.
1977                         bool do_method_search = !method_search && (method_hash != null);
1978
1979                         ArrayList applicable;
1980
1981                         // If this is a method-only search, we try to use the method cache if
1982                         // possible; a lookup in the method cache will return a MemberInfo with
1983                         // the correct ReflectedType for inherited methods.
1984
1985                         if (method_search && (method_hash != null))
1986                                 applicable = (ArrayList) method_hash [name];
1987                         else
1988                                 applicable = (ArrayList) member_hash [name];
1989
1990                         if (applicable == null)
1991                                 return emptyMemberInfo;
1992
1993                         //
1994                         // 32  slots gives 53 rss/54 size
1995                         // 2/4 slots gives 55 rss
1996                         //
1997                         // Strange: from 25,000 calls, only 1,800
1998                         // are above 2.  Why does this impact it?
1999                         //
2000                         global.Clear ();
2001                         using_global = true;
2002
2003                         Timer.StartTimer (TimerType.CachedLookup);
2004
2005                         EntryType type = GetEntryType (mt, bf);
2006
2007                         IMemberContainer current = Container;
2008
2009
2010                         // `applicable' is a list of all members with the given member name `name'
2011                         // in the current class and all its base classes.  The list is sorted in
2012                         // reverse order due to the way how the cache is initialy created (to speed
2013                         // things up, we're doing a deep-copy of our base).
2014
2015                         for (int i = applicable.Count-1; i >= 0; i--) {
2016                                 CacheEntry entry = (CacheEntry) applicable [i];
2017
2018                                 // This happens each time we're walking one level up in the class
2019                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
2020                                 // the first time this happens (this may already happen in the first
2021                                 // iteration of this loop if there are no members with the name we're
2022                                 // looking for in the current class).
2023                                 if (entry.Container != current) {
2024                                         if (declared_only || DoneSearching (global))
2025                                                 break;
2026
2027                                         current = entry.Container;
2028                                 }
2029
2030                                 // Is the member of the correct type ?
2031                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2032                                         continue;
2033
2034                                 // Is the member static/non-static ?
2035                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2036                                         continue;
2037
2038                                 // Apply the filter to it.
2039                                 if (filter (entry.Member, criteria)) {
2040                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
2041                                                 do_method_search = false;
2042                                         global.Add (entry.Member);
2043                                 }
2044                         }
2045
2046                         Timer.StopTimer (TimerType.CachedLookup);
2047
2048                         // If we have a method cache and we aren't already doing a method-only
2049                         // search, we restart in method-only search mode if the first match is
2050                         // a method.  This ensures that we return a MemberInfo with the correct
2051                         // ReflectedType for inherited methods.
2052                         if (do_method_search && (global.Count > 0)){
2053                                 using_global = false;
2054
2055                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2056                         }
2057
2058                         using_global = false;
2059                         MemberInfo [] copy = new MemberInfo [global.Count];
2060                         global.CopyTo (copy);
2061                         return copy;
2062                 }
2063
2064                 // find the nested type @name in @this.
2065                 public Type FindNestedType (string name)
2066                 {
2067                         ArrayList applicable = (ArrayList) member_hash [name];
2068                         if (applicable == null)
2069                                 return null;
2070
2071                         for (int i = applicable.Count-1; i >= 0; i--) {
2072                                 CacheEntry entry = (CacheEntry) applicable [i];
2073                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
2074                                         return (Type) entry.Member;
2075                         }
2076
2077                         return null;
2078                 }
2079
2080                 //
2081                 // This finds the method or property for us to override. invocationType is the type where
2082                 // the override is going to be declared, name is the name of the method/property, and
2083                 // paramTypes is the parameters, if any to the method or property
2084                 //
2085                 // Because the MemberCache holds members from this class and all the base classes,
2086                 // we can avoid tons of reflection stuff.
2087                 //
2088                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
2089                 {
2090                         ArrayList applicable;
2091                         if (method_hash != null && !is_property)
2092                                 applicable = (ArrayList) method_hash [name];
2093                         else
2094                                 applicable = (ArrayList) member_hash [name];
2095
2096                         if (applicable == null)
2097                                 return null;
2098                         //
2099                         // Walk the chain of methods, starting from the top.
2100                         //
2101                         for (int i = applicable.Count - 1; i >= 0; i--) {
2102                                 CacheEntry entry = (CacheEntry) applicable [i];
2103
2104                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2105                                         continue;
2106
2107                                 PropertyInfo pi = null;
2108                                 MethodInfo mi = null;
2109                                 FieldInfo fi = null;
2110                                 Type [] cmpAttrs = null;
2111
2112                                 if (is_property) {
2113                                         if ((entry.EntryType & EntryType.Field) != 0) {
2114                                                 fi = (FieldInfo)entry.Member;
2115
2116                                                 // TODO: For this case we ignore member type
2117                                                 //fb = TypeManager.GetField (fi);
2118                                                 //cmpAttrs = new Type[] { fb.MemberType };
2119                                         } else {
2120                                                 pi = (PropertyInfo) entry.Member;
2121                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
2122                                         }
2123                                 } else {
2124                                         mi = (MethodInfo) entry.Member;
2125                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
2126                                 }
2127
2128                                 if (fi != null) {
2129                                         // TODO: Almost duplicate !
2130                                         // Check visibility
2131                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2132                                                 case FieldAttributes.Private:
2133                                                         //
2134                                                         // A private method is Ok if we are a nested subtype.
2135                                                         // The spec actually is not very clear about this, see bug 52458.
2136                                                         //
2137                                                         if (invocationType != entry.Container.Type &
2138                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2139                                                                 continue;
2140
2141                                                         break;
2142                                                 case FieldAttributes.FamANDAssem:
2143                                                 case FieldAttributes.Assembly:
2144                                                         //
2145                                                         // Check for assembly methods
2146                                                         //
2147                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2148                                                                 continue;
2149                                                         break;
2150                                         }
2151                                         return entry.Member;
2152                                 }
2153
2154                                 //
2155                                 // Check the arguments
2156                                 //
2157                                 if (cmpAttrs.Length != paramTypes.Length)
2158                                         continue;
2159
2160                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --) {
2161                                         if (!TypeManager.IsEqual (paramTypes [j], cmpAttrs [j]))
2162                                                 goto next;
2163                                 }
2164
2165                                 //
2166                                 // get one of the methods because this has the visibility info.
2167                                 //
2168                                 if (is_property) {
2169                                         mi = pi.GetGetMethod (true);
2170                                         if (mi == null)
2171                                                 mi = pi.GetSetMethod (true);
2172                                 }
2173
2174                                 //
2175                                 // Check visibility
2176                                 //
2177                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2178                                 case MethodAttributes.Private:
2179                                         //
2180                                         // A private method is Ok if we are a nested subtype.
2181                                         // The spec actually is not very clear about this, see bug 52458.
2182                                         //
2183                                         if (invocationType.Equals (entry.Container.Type) ||
2184                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2185                                                 return entry.Member;
2186
2187                                         break;
2188                                 case MethodAttributes.FamANDAssem:
2189                                 case MethodAttributes.Assembly:
2190                                         //
2191                                         // Check for assembly methods
2192                                         //
2193                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
2194                                                 return entry.Member;
2195
2196                                         break;
2197                                 default:
2198                                         //
2199                                         // A protected method is ok, because we are overriding.
2200                                         // public is always ok.
2201                                         //
2202                                         return entry.Member;
2203                                 }
2204                         next:
2205                                 ;
2206                         }
2207
2208                         return null;
2209                 }
2210
2211                 /// <summary>
2212                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2213                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2214                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2215                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2216                 /// </summary>
2217                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2218                 {
2219                         ArrayList applicable = null;
2220
2221                         if (method_hash != null)
2222                                 applicable = (ArrayList) method_hash [name];
2223
2224                         if (applicable != null) {
2225                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2226                                         CacheEntry entry = (CacheEntry) applicable [i];
2227                                         if ((entry.EntryType & EntryType.Public) != 0)
2228                                                 return entry.Member;
2229                                 }
2230                         }
2231
2232                         if (member_hash == null)
2233                                 return null;
2234                         applicable = (ArrayList) member_hash [name];
2235
2236                         if (applicable != null) {
2237                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2238                                         CacheEntry entry = (CacheEntry) applicable [i];
2239                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2240                                                 if (ignore_complex_types) {
2241                                                         if ((entry.EntryType & EntryType.Method) != 0)
2242                                                                 continue;
2243
2244                                                         // Does exist easier way how to detect indexer ?
2245                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2246                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
2247                                                                 if (arg_types.Length > 0)
2248                                                                         continue;
2249                                                         }
2250                                                 }
2251                                                 return entry.Member;
2252                                         }
2253                                 }
2254                         }
2255                         return null;
2256                 }
2257
2258                 Hashtable locase_table;
2259
2260                 /// <summary>
2261                 /// Builds low-case table for CLS Compliance test
2262                 /// </summary>
2263                 public Hashtable GetPublicMembers ()
2264                 {
2265                         if (locase_table != null)
2266                                 return locase_table;
2267
2268                         locase_table = new Hashtable ();
2269                         foreach (DictionaryEntry entry in member_hash) {
2270                                 ArrayList members = (ArrayList)entry.Value;
2271                                 for (int ii = 0; ii < members.Count; ++ii) {
2272                                         CacheEntry member_entry = (CacheEntry) members [ii];
2273
2274                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2275                                                 continue;
2276
2277                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2278                                         switch (member_entry.EntryType & EntryType.MaskType) {
2279                                                 case EntryType.Constructor:
2280                                                         continue;
2281
2282                                                 case EntryType.Field:
2283                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2284                                                                 continue;
2285                                                         break;
2286
2287                                                 case EntryType.Method:
2288                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2289                                                                 continue;
2290                                                         break;
2291
2292                                                 case EntryType.Property:
2293                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
2294                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2295                                                                 continue;
2296                                                         break;
2297
2298                                                 case EntryType.Event:
2299                                                         EventInfo ei = (EventInfo)member_entry.Member;
2300                                                         MethodInfo mi = ei.GetAddMethod ();
2301                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2302                                                                 continue;
2303                                                         break;
2304                                         }
2305                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2306                                         locase_table [lcase] = member_entry.Member;
2307                                         break;
2308                                 }
2309                         }
2310                         return locase_table;
2311                 }
2312
2313                 public Hashtable Members {
2314                         get {
2315                                 return member_hash;
2316                         }
2317                 }
2318
2319                 /// <summary>
2320                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2321                 /// </summary>
2322                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2323                 {
2324                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2325
2326                         for (int i = 0; i < al.Count; ++i) {
2327                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2328
2329                                 // skip itself
2330                                 if (entry.Member == this_builder)
2331                                         continue;
2332
2333                                 if ((entry.EntryType & tested_type) != tested_type)
2334                                         continue;
2335
2336                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2337                                 if (AttributeTester.AreOverloadedMethodParamsClsCompliant (method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare)))
2338                                         continue;
2339
2340                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2341
2342                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2343                                 // However it is exactly what csc does.
2344                                 if (md != null && !md.IsClsCompliaceRequired (method.Parent))
2345                                         continue;
2346
2347                                 Report.SymbolRelatedToPreviousError (entry.Member);
2348                                 Report.Error (3006, method.Location, "Overloaded method '{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2349                         }
2350                 }
2351         }
2352 }