mcs/mcs/decl.cs

   1 //
   2 // decl.cs: Declaration base class for structs, classes, enums and interfaces.
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // 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.Collections;
  17 using System.Globalization;
  18 using System.Reflection.Emit;
  19 using System.Reflection;
  20
  21 #if BOOTSTRAP_WITH_OLDLIB
  22 using XmlElement = System.Object;
  23 #else
  24 using System.Xml;
  25 #endif
  26
  27 namespace Mono.CSharp {
  28
  29         public class MemberName {
  30                 public readonly string Name;
  31                 public readonly MemberName Left;
  32
  33                 public static readonly MemberName Null = new MemberName ("");
  34
  35                 public MemberName (string name)
  36                 {
  37                         this.Name = name;
  38                 }
  39
  40                 public MemberName (MemberName left, string name)
  41                         : this (name)
  42                 {
  43                         this.Left = left;
  44                 }
  45
  46                 public MemberName (MemberName left, MemberName right)
  47                 {
  48                         Name = right.Name;
  49                         Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  50                 }
  51
  52                 static readonly char [] dot_array = { '.' };
  53
  54                 public static MemberName FromDotted (string name)
  55                 {
  56                         string [] elements = name.Split (dot_array);
  57                         int count = elements.Length;
  58                         int i = 0;
  59                         MemberName n = new MemberName (elements [i++]);
  60                         while (i < count)
  61                                 n = new MemberName (n, elements [i++]);
  62                         return n;
  63                 }
  64
  65                 public string GetName ()
  66                 {
  67                         return GetName (false);
  68                 }
  69
  70                 public string GetName (bool is_generic)
  71                 {
  72                         string name = is_generic ? Basename : Name;
  73                         if (Left != null)
  74                                 return Left.GetName (is_generic) + "." + name;
  75                         else
  76                                 return name;
  77                 }
  78
  79                 ///
  80                 /// This returns exclusively the name as seen on the source code
  81                 /// it is not the fully qualifed type after resolution
  82                 ///
  83                 public string GetPartialName ()
  84                 {
  85                         if (Left != null)
  86                                 return Left.GetPartialName () + "." + Name;
  87                         else
  88                                 return Name;
  89                 }
  90
  91                 public string GetTypeName ()
  92                 {
  93                         if (Left != null)
  94                                 return Left.GetTypeName () + "." + Name;
  95                         else
  96                                 return Name;
  97                 }
  98
  99                 public Expression GetTypeExpression (Location loc)
 100                 {
 101                         if (Left != null) {
 102                                 Expression lexpr = Left.GetTypeExpression (loc);
 103
 104                                 return new MemberAccess (lexpr, Name, loc);
 105                         } else {
 106                                 return new SimpleName (Name, loc);
 107                         }
 108                 }
 109
 110                 public MemberName Clone ()
 111                 {
 112                         if (Left != null)
 113                                 return new MemberName (Left.Clone (), Name);
 114                         else
 115                                 return new MemberName (Name);
 116                 }
 117
 118                 public string Basename {
 119                         get {
 120                                 return Name;
 121                         }
 122                 }
 123
 124                 public override string ToString ()
 125                 {
 126                         if (Left != null)
 127                                 return Left + "." + Name;
 128                         else
 129                                 return Name;
 130                 }
 131
 132                 public override bool Equals (object other)
 133                 {
 134                         return Equals (other as MemberName);
 135                 }
 136
 137                 public bool Equals (MemberName other)
 138                 {
 139                         if (this == other)
 140                                 return true;
 141                         if (other == null || Name != other.Name)
 142                                 return false;
 143 #if NET_2_0
 144                         if (TypeArguments == null)
 145                                 return other.TypeArguments == null;
 146
 147                         if (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count)
 148                                 return false;
 149 #endif
 150                         if (Left == null)
 151                                 return other.Left == null;
 152
 153                         return Left.Equals (other.Left);
 154                 }
 155
 156                 public override int GetHashCode ()
 157                 {
 158                         int hash = Name.GetHashCode ();
 159                         for (MemberName n = Left; n != null; n = n.Left)
 160                                 hash ^= n.Name.GetHashCode ();
 161
 162 #if NET_2_0
 163                         if (TypeArguments != null)
 164                                 hash ^= TypeArguments.Count << 5;
 165 #endif
 166
 167                         return hash & 0x7FFFFFFF;
 168                 }
 169         }
 170
 171         /// <summary>
 172         ///   Base representation for members.  This is used to keep track
 173         ///   of Name, Location and Modifier flags, and handling Attributes.
 174         /// </summary>
 175         public abstract class MemberCore : Attributable {
 176                 /// <summary>
 177                 ///   Public name
 178                 /// </summary>
 179
 180                 protected string cached_name;
 181                 public string Name {
 182                         get {
 183                                 if (cached_name == null)
 184                                         cached_name = MemberName.GetName (false);
 185                                 return cached_name;
 186                         }
 187                 }
 188
 189                 // Is not readonly because of IndexerName attribute
 190                 private MemberName member_name;
 191                 public MemberName MemberName {
 192                         get { return member_name; }
 193                 }
 194
 195                 /// <summary>
 196                 ///   Modifier flags that the user specified in the source code
 197                 /// </summary>
 198                 public int ModFlags;
 199
 200                 public /*readonly*/ TypeContainer Parent;
 201
 202                 /// <summary>
 203                 ///   Location where this declaration happens
 204                 /// </summary>
 205                 public readonly Location Location;
 206
 207                 /// <summary>
 208                 ///   XML documentation comment
 209                 /// </summary>
 210                 public string DocComment;
 211
 212                 /// <summary>
 213                 ///   Represents header string for documentation comment
 214                 ///   for each member types.
 215                 /// </summary>
 216                 public abstract string DocCommentHeader { get; }
 217
 218                 [Flags]
 219                 public enum Flags {
 220                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 221                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 222                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 223                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 224                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 225                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 226                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 227                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 228                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 229                         Excluded = 1 << 9,                                      // Method is conditional
 230                         TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
 231                         IsUsed = 1 << 11,
 232                         IsAssigned = 1 << 12                            // Field is assigned
 233                 }
 234
 235                 /// <summary>
 236                 ///   MemberCore flags at first detected then cached
 237                 /// </summary>
 238                 internal Flags caching_flags;
 239
 240                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs,
 241                                    Location loc)
 242                         : base (attrs)
 243                 {
 244                         if (parent is PartialContainer && !(this is PartialContainer))
 245                                 throw new InternalErrorException ("A PartialContainer cannot be the direct parent of a member");
 246
 247                         Parent = parent;
 248                         member_name = name;
 249                         Location = loc;
 250                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 251                 }
 252
 253                 protected virtual void SetMemberName (MemberName new_name)
 254                 {
 255                         member_name = new_name;
 256                         cached_name = null;
 257                 }
 258
 259                 /// <summary>
 260                 /// Tests presence of ObsoleteAttribute and report proper error
 261                 /// </summary>
 262                 protected void CheckUsageOfObsoleteAttribute (Type type)
 263                 {
 264                         if (type == null)
 265                                 return;
 266
 267                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
 268                         if (obsolete_attr == null)
 269                                 return;
 270
 271                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
 272                 }
 273
 274                 public abstract bool Define ();
 275
 276                 //
 277                 // Returns full member name for error message
 278                 //
 279                 public virtual string GetSignatureForError ()
 280                 {
 281                         if (Parent == null || Parent.Parent == null)
 282                                 return Name;
 283
 284                         return String.Concat (Parent.GetSignatureForError (), '.', Name);
 285                 }
 286
 287                 /// <summary>
 288                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 289                 /// </summary>
 290                 public virtual void Emit ()
 291                 {
 292                         // Hack with Parent == null is for EnumMember
 293                         if (Parent == null || (GetObsoleteAttribute (Parent) == null && Parent.GetObsoleteAttribute (Parent) == null))
 294                                 VerifyObsoleteAttribute ();
 295
 296                         if (!RootContext.VerifyClsCompliance)
 297                                 return;
 298
 299                         VerifyClsCompliance (Parent);
 300                 }
 301
 302                 public bool InUnsafe {
 303                         get {
 304                                 return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
 305                         }
 306                 }
 307
 308                 public virtual bool IsUsed {
 309                         get {
 310                                 return (caching_flags & Flags.IsUsed) != 0;
 311                         }
 312                 }
 313
 314                 public void SetMemberIsUsed ()
 315                 {
 316                         caching_flags |= Flags.IsUsed;
 317                 }
 318
 319                 //
 320                 // Whehter is it ok to use an unsafe pointer in this type container
 321                 //
 322                 public bool UnsafeOK (DeclSpace parent)
 323                 {
 324                         //
 325                         // First check if this MemberCore modifier flags has unsafe set
 326                         //
 327                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 328                                 return true;
 329
 330                         if (parent.UnsafeContext)
 331                                 return true;
 332
 333                         Expression.UnsafeError (Location);
 334                         return false;
 335                 }
 336
 337                 /// <summary>
 338                 /// Returns instance of ObsoleteAttribute for this MemberCore
 339                 /// </summary>
 340                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 341                 {
 342                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 343                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 344                                 return null;
 345                         }
 346
 347                         caching_flags &= ~Flags.Obsolete_Undetected;
 348
 349                         if (OptAttributes == null)
 350                                 return null;
 351
 352                         Attribute obsolete_attr = OptAttributes.Search (
 353                                 TypeManager.obsolete_attribute_type, ds.EmitContext);
 354                         if (obsolete_attr == null)
 355                                 return null;
 356
 357                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds.EmitContext);
 358                         if (obsolete == null)
 359                                 return null;
 360
 361                         caching_flags |= Flags.Obsolete;
 362                         return obsolete;
 363                 }
 364
 365                 /// <summary>
 366                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 367                 /// </summary>
 368                 public override bool IsClsCompliaceRequired (DeclSpace container)
 369                 {
 370                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 371                                 return (caching_flags & Flags.ClsCompliant) != 0;
 372
 373                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 374                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 375                                 caching_flags |= Flags.ClsCompliant;
 376                                 return true;
 377                         }
 378
 379                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 380                         return false;
 381                 }
 382
 383                 /// <summary>
 384                 /// Returns true when MemberCore is exposed from assembly.
 385                 /// </summary>
 386                 public bool IsExposedFromAssembly (DeclSpace ds)
 387                 {
 388                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 389                                 return false;
 390
 391                         DeclSpace parentContainer = ds;
 392                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 393                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 394                                         return false;
 395                                 parentContainer = parentContainer.Parent;
 396                         }
 397                         return true;
 398                 }
 399
 400                 /// <summary>
 401                 /// Resolve CLSCompliantAttribute value or gets cached value.
 402                 /// </summary>
 403                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 404                 {
 405                         if (OptAttributes != null) {
 406                                 Attribute cls_attribute = OptAttributes.Search (
 407                                         TypeManager.cls_compliant_attribute_type, ds.EmitContext);
 408                                 if (cls_attribute != null) {
 409                                         caching_flags |= Flags.HasClsCompliantAttribute;
 410                                         return cls_attribute.GetClsCompliantAttributeValue (ds.EmitContext);
 411                                 }
 412                         }
 413                         return ds.GetClsCompliantAttributeValue ();
 414                 }
 415
 416                 /// <summary>
 417                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 418                 /// </summary>
 419                 protected bool HasClsCompliantAttribute {
 420                         get {
 421                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 422                         }
 423                 }
 424
 425                 /// <summary>
 426                 /// It helps to handle error 102 & 111 detection
 427                 /// </summary>
 428                 public virtual bool MarkForDuplicationCheck ()
 429                 {
 430                         return false;
 431                 }
 432
 433                 /// <summary>
 434                 /// The main virtual method for CLS-Compliant verifications.
 435                 /// The method returns true if member is CLS-Compliant and false if member is not
 436                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 437                 /// and add their extra verifications.
 438                 /// </summary>
 439                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 440                 {
 441                         if (!IsClsCompliaceRequired (ds)) {
 442                                 if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
 443                                         if (!IsExposedFromAssembly (ds))
 444                                                 Report.Warning (3019, Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
 445                                         if (!CodeGen.Assembly.IsClsCompliant)
 446                                                 Report.Warning (3021, Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
 447                                 }
 448                                 return false;
 449                         }
 450
 451                         if (!CodeGen.Assembly.IsClsCompliant) {
 452                                 if (HasClsCompliantAttribute) {
 453                                         Report.Error (3014, Location,
 454                                                 "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 455                                                 GetSignatureForError ());
 456                                 }
 457                                 return false;
 458                         }
 459
 460                         if (member_name.Name [0] == '_') {
 461                                 Report.Error (3008, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 462                         }
 463                         return true;
 464                 }
 465
 466                 protected abstract void VerifyObsoleteAttribute ();
 467
 468                 //
 469                 // Raised (and passed an XmlElement that contains the comment)
 470                 // when GenerateDocComment is writing documentation expectedly.
 471                 //
 472                 internal virtual void OnGenerateDocComment (DeclSpace ds, XmlElement intermediateNode)
 473                 {
 474                 }
 475
 476                 //
 477                 // Returns a string that represents the signature for this
 478                 // member which should be used in XML documentation.
 479                 //
 480                 public virtual string GetDocCommentName (DeclSpace ds)
 481                 {
 482                         if (ds == null || this is DeclSpace)
 483                                 return DocCommentHeader + Name;
 484                         else
 485                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 486                 }
 487
 488                 //
 489                 // Generates xml doc comments (if any), and if required,
 490                 // handle warning report.
 491                 //
 492                 internal virtual void GenerateDocComment (DeclSpace ds)
 493                 {
 494                         DocUtil.GenerateDocComment (this, ds);
 495                 }
 496         }
 497
 498         /// <summary>
 499         ///   Base class for structs, classes, enumerations and interfaces.
 500         /// </summary>
 501         /// <remarks>
 502         ///   They all create new declaration spaces.  This
 503         ///   provides the common foundation for managing those name
 504         ///   spaces.
 505         /// </remarks>
 506         public abstract class DeclSpace : MemberCore {
 507                 /// <summary>
 508                 ///   This points to the actual definition that is being
 509                 ///   created with System.Reflection.Emit
 510                 /// </summary>
 511                 public TypeBuilder TypeBuilder;
 512
 513                 //
 514                 // This is the namespace in which this typecontainer
 515                 // was declared.  We use this to resolve names.
 516                 //
 517                 public NamespaceEntry NamespaceEntry;
 518
 519                 private Hashtable Cache = new Hashtable ();
 520
 521                 public string Basename;
 522
 523                 protected Hashtable defined_names;
 524
 525                 // The emit context for toplevel objects.
 526                 protected EmitContext ec;
 527
 528                 public EmitContext EmitContext {
 529                         get { return ec; }
 530                 }
 531
 532                 static string[] attribute_targets = new string [] { "type" };
 533
 534                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 535                                   Attributes attrs, Location l)
 536                         : base (parent, name, attrs, l)
 537                 {
 538                         NamespaceEntry = ns;
 539                         Basename = name.Name;
 540                         defined_names = new Hashtable ();
 541                 }
 542
 543                 /// <summary>
 544                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 545                 /// </summary>
 546                 protected bool AddToContainer (MemberCore symbol, string name)
 547                 {
 548                         if (name == Basename && !(this is Interface) && !(this is Enum)) {
 549                                 Report.SymbolRelatedToPreviousError (this);
 550                                 Report.Error (542,  symbol.Location, "`{0}': member names cannot be the same as their enclosing type", symbol.GetSignatureForError ());
 551                                 return false;
 552                         }
 553
 554                         MemberCore mc = (MemberCore) defined_names [name];
 555
 556                         if (mc == null) {
 557                                 defined_names.Add (name, symbol);
 558                                 return true;
 559                         }
 560
 561                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 562                                 return true;
 563
 564                         Report.SymbolRelatedToPreviousError (mc);
 565                         if (symbol is PartialContainer || mc is PartialContainer) {
 566                                 Report.Error (260, symbol.Location,
 567                                         "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
 568                                         name);
 569                                 return false;
 570                         }
 571
 572                         if (this is RootTypes) {
 573                                 Report.Error (101, symbol.Location,
 574                                         "The namespace `{0}' already contains a definition for `{1}'",
 575                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
 576                         } else {
 577                                 Report.Error (102, symbol.Location, "The type `{0}' already contains a definition for `{1}'",
 578                                         GetSignatureForError (), symbol.MemberName.Name);
 579                         }
 580                         return false;
 581                 }
 582
 583                 /// <summary>
 584                 ///   Returns the MemberCore associated with a given name in the declaration
 585                 ///   space. It doesn't return method based symbols !!
 586                 /// </summary>
 587                 ///
 588                 public MemberCore GetDefinition (string name)
 589                 {
 590                         return (MemberCore)defined_names [name];
 591                 }
 592
 593                 //
 594                 // root_types contains all the types.  All TopLevel types
 595                 // hence have a parent that points to `root_types', that is
 596                 // why there is a non-obvious test down here.
 597                 //
 598                 public bool IsTopLevel {
 599                         get { return (Parent != null && Parent.Parent == null); }
 600                 }
 601
 602                 public virtual void CloseType ()
 603                 {
 604                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 605                                 try {
 606                                         TypeBuilder.CreateType ();
 607                                 } catch {
 608                                         //
 609                                         // The try/catch is needed because
 610                                         // nested enumerations fail to load when they
 611                                         // are defined.
 612                                         //
 613                                         // Even if this is the right order (enumerations
 614                                         // declared after types).
 615                                         //
 616                                         // Note that this still creates the type and
 617                                         // it is possible to save it
 618                                 }
 619                                 caching_flags |= Flags.CloseTypeCreated;
 620                         }
 621                 }
 622
 623                 protected virtual TypeAttributes TypeAttr {
 624                         get { return CodeGen.Module.DefaultCharSetType; }
 625                 }
 626
 627                 /// <remarks>
 628                 ///  Should be overriten by the appropriate declaration space
 629                 /// </remarks>
 630                 public abstract TypeBuilder DefineType ();
 631
 632                 /// <summary>
 633                 ///   Define all members, but don't apply any attributes or do anything which may
 634                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 635                 /// </summary>
 636                 public virtual bool DefineMembers (TypeContainer parent)
 637                 {
 638                         if (((ModFlags & Modifiers.NEW) != 0) && IsTopLevel) {
 639                                 Report.Error (1530, Location, "Keyword `new' is not allowed on namespace elements");
 640                                 return false;
 641                         }
 642                         return true;
 643                 }
 644
 645                 public override string GetSignatureForError ()
 646                 {
 647                         // Parent.GetSignatureForError
 648                         return Name;
 649                 }
 650
 651                 //
 652                 // Whether this is an `unsafe context'
 653                 //
 654                 public bool UnsafeContext {
 655                         get {
 656                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 657                                         return true;
 658                                 if (Parent != null)
 659                                         return Parent.UnsafeContext;
 660                                 return false;
 661                         }
 662                 }
 663
 664                 EmitContext type_resolve_ec;
 665                 protected EmitContext TypeResolveEmitContext {
 666                         get {
 667                                 if (type_resolve_ec == null) {
 668                                         // FIXME: I think this should really be one of:
 669                                         //
 670                                         // a. type_resolve_ec = Parent.EmitContext;
 671                                         // b. type_resolve_ec = new EmitContext (Parent, Parent, loc, null, null, ModFlags, false);
 672                                         //
 673                                         // However, if Parent == RootContext.Tree.Types, its NamespaceEntry will be null.
 674                                         //
 675                                         type_resolve_ec = new EmitContext (Parent, this, Location.Null, null, null, ModFlags, false);
 676                                 }
 677                                 return type_resolve_ec;
 678                         }
 679                 }
 680
 681                 // <summary>
 682                 //    Resolves the expression `e' for a type, and will recursively define
 683                 //    types.  This should only be used for resolving base types.
 684                 // </summary>
 685                 public TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
 686                 {
 687                         TypeResolveEmitContext.loc = loc;
 688                         TypeResolveEmitContext.ContainerType = TypeBuilder;
 689
 690                         return e.ResolveAsTypeTerminal (TypeResolveEmitContext, silent);
 691                 }
 692
 693                 public bool CheckAccessLevel (Type check_type)
 694                 {
 695                         if (check_type == TypeBuilder)
 696                                 return true;
 697
 698                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 699
 700                         //
 701                         // Broken Microsoft runtime, return public for arrays, no matter what
 702                         // the accessibility is for their underlying class, and they return
 703                         // NonPublic visibility for pointers
 704                         //
 705                         if (check_type.IsArray || check_type.IsPointer)
 706                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 707
 708                         if (TypeBuilder == null)
 709                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 710                                 //        However, this is invoked again later -- so safe to return true.
 711                                 //        May also be null when resolving top-level attributes.
 712                                 return true;
 713
 714                         switch (check_attr){
 715                         case TypeAttributes.Public:
 716                                 return true;
 717
 718                         case TypeAttributes.NotPublic:
 719                                 //
 720                                 // This test should probably use the declaringtype.
 721                                 //
 722                                 return check_type.Assembly == TypeBuilder.Assembly;
 723
 724                         case TypeAttributes.NestedPublic:
 725                                 return true;
 726
 727                         case TypeAttributes.NestedPrivate:
 728                                 return NestedAccessible (check_type);
 729
 730                         case TypeAttributes.NestedFamily:
 731                                 return FamilyAccessible (check_type);
 732
 733                         case TypeAttributes.NestedFamANDAssem:
 734                                 return (check_type.Assembly == TypeBuilder.Assembly) &&
 735                                         FamilyAccessible (check_type);
 736
 737                         case TypeAttributes.NestedFamORAssem:
 738                                 return (check_type.Assembly == TypeBuilder.Assembly) ||
 739                                         FamilyAccessible (check_type);
 740
 741                         case TypeAttributes.NestedAssembly:
 742                                 return check_type.Assembly == TypeBuilder.Assembly;
 743                         }
 744
 745                         Console.WriteLine ("HERE: " + check_attr);
 746                         return false;
 747
 748                 }
 749
 750                 protected bool NestedAccessible (Type check_type)
 751                 {
 752                         Type declaring = check_type.DeclaringType;
 753                         return TypeBuilder == declaring ||
 754                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 755                 }
 756
 757                 protected bool FamilyAccessible (Type check_type)
 758                 {
 759                         Type declaring = check_type.DeclaringType;
 760                         return TypeManager.IsNestedFamilyAccessible (TypeBuilder, declaring);
 761                 }
 762
 763                 // Access level of a type.
 764                 const int X = 1;
 765                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 766                                             // Public    Assembly   Protected
 767                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 768                         Public              = (X << 0) | (X << 1) | (X << 2),
 769                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 770                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 771                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 772                 }
 773
 774                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 775                 {
 776                         if ((flags & Modifiers.INTERNAL) != 0) {
 777
 778                                 if ((flags & Modifiers.PROTECTED) != 0)
 779                                         return AccessLevel.ProtectedOrInternal;
 780                                 else
 781                                         return AccessLevel.Internal;
 782
 783                         } else if ((flags & Modifiers.PROTECTED) != 0)
 784                                 return AccessLevel.Protected;
 785
 786                         else if ((flags & Modifiers.PRIVATE) != 0)
 787                                 return AccessLevel.Private;
 788
 789                         else
 790                                 return AccessLevel.Public;
 791                 }
 792
 793                 // What is the effective access level of this?
 794                 // TODO: Cache this?
 795                 AccessLevel EffectiveAccessLevel {
 796                         get {
 797                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 798                                 if (!IsTopLevel && (Parent != null))
 799                                         return myAccess & Parent.EffectiveAccessLevel;
 800                                 else
 801                                         return myAccess;
 802                         }
 803                 }
 804
 805                 // Return the access level for type `t'
 806                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 807                 {
 808                         if (t.IsPublic)
 809                                 return AccessLevel.Public;
 810                         if (t.IsNestedPrivate)
 811                                 return AccessLevel.Private;
 812                         if (t.IsNotPublic)
 813                                 return AccessLevel.Internal;
 814
 815                         // By now, it must be nested
 816                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
 817
 818                         if (t.IsNestedPublic)
 819                                 return parentLevel;
 820                         if (t.IsNestedAssembly)
 821                                 return parentLevel & AccessLevel.Internal;
 822                         if (t.IsNestedFamily)
 823                                 return parentLevel & AccessLevel.Protected;
 824                         if (t.IsNestedFamORAssem)
 825                                 return parentLevel & AccessLevel.ProtectedOrInternal;
 826                         if (t.IsNestedFamANDAssem)
 827                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 828
 829                         // nested private is taken care of
 830
 831                         throw new Exception ("I give up, what are you?");
 832                 }
 833
 834                 //
 835                 // This answers `is the type P, as accessible as a member M which has the
 836                 // accessability @flags which is declared as a nested member of the type T, this declspace'
 837                 //
 838                 public bool AsAccessible (Type p, int flags)
 839                 {
 840                         //
 841                         // 1) if M is private, its accessability is the same as this declspace.
 842                         // we already know that P is accessible to T before this method, so we
 843                         // may return true.
 844                         //
 845
 846                         if ((flags & Modifiers.PRIVATE) != 0)
 847                                 return true;
 848
 849                         while (p.IsArray || p.IsPointer || p.IsByRef)
 850                                 p = TypeManager.GetElementType (p);
 851
 852                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
 853                         AccessLevel mAccess = this.EffectiveAccessLevel &
 854                                 GetAccessLevelFromModifiers (flags);
 855
 856                         // for every place from which we can access M, we must
 857                         // be able to access P as well. So, we want
 858                         // For every bit in M and P, M_i -> P_1 == true
 859                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
 860
 861                         return ~ (~ mAccess | pAccess) == 0;
 862                 }
 863
 864                 //
 865                 // Return the nested type with name @name.  Ensures that the nested type
 866                 // is defined if necessary.  Do _not_ use this when you have a MemberCache handy.
 867                 //
 868                 public virtual Type FindNestedType (string name)
 869                 {
 870                         return null;
 871                 }
 872
 873                 private Type LookupNestedTypeInHierarchy (string name)
 874                 {
 875                         // if the member cache has been created, lets use it.
 876                         // the member cache is MUCH faster.
 877                         if (MemberCache != null)
 878                                 return MemberCache.FindNestedType (name);
 879
 880                         // no member cache. Do it the hard way -- reflection
 881                         Type t = null;
 882                         for (Type current_type = TypeBuilder;
 883                              current_type != null && current_type != TypeManager.object_type;
 884                              current_type = current_type.BaseType) {
 885                                 if (current_type is TypeBuilder) {
 886                                         DeclSpace decl = this;
 887                                         if (current_type != TypeBuilder)
 888                                                 decl = TypeManager.LookupDeclSpace (current_type);
 889                                         t = decl.FindNestedType (name);
 890                                 } else {
 891                                         t = TypeManager.GetNestedType (current_type, name);
 892                                 }
 893
 894                                 if (t != null && CheckAccessLevel (t))
 895                                         return t;
 896                         }
 897
 898                         return null;
 899                 }
 900
 901                 //
 902                 // Public function used to locate types.
 903                 //
 904                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
 905                 //
 906                 // Returns: Type or null if they type can not be found.
 907                 //
 908                 public FullNamedExpression LookupType (string name, Location loc, bool ignore_cs0104)
 909                 {
 910                         if (this is PartialContainer)
 911                                 throw new InternalErrorException ("Should not get here");
 912
 913                         if (Cache.Contains (name))
 914                                 return (FullNamedExpression) Cache [name];
 915
 916                         FullNamedExpression e;
 917                         Type t = LookupNestedTypeInHierarchy (name);
 918                         if (t != null)
 919                                 e = new TypeExpression (t, Location.Null);
 920                         else if (Parent != null && Parent != RootContext.Tree.Types)
 921                                 e = Parent.LookupType (name, loc, ignore_cs0104);
 922                         else
 923                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
 924
 925                         Cache [name] = e;
 926                         return e;
 927                 }
 928
 929                 /// <remarks>
 930                 ///   This function is broken and not what you're looking for.  It should only
 931                 ///   be used while the type is still being created since it doesn't use the cache
 932                 ///   and relies on the filter doing the member name check.
 933                 /// </remarks>
 934                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
 935                                                         MemberFilter filter, object criteria);
 936
 937                 /// <remarks>
 938                 ///   If we have a MemberCache, return it.  This property may return null if the
 939                 ///   class doesn't have a member cache or while it's still being created.
 940                 /// </remarks>
 941                 public abstract MemberCache MemberCache {
 942                         get;
 943                 }
 944
 945                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
 946                 {
 947                         if (a.Type == TypeManager.required_attr_type) {
 948                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
 949                                 return;
 950                         }
 951                         TypeBuilder.SetCustomAttribute (cb);
 952                 }
 953
 954                 /// <summary>
 955                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
 956                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
 957                 /// </summary>
 958                 public bool GetClsCompliantAttributeValue ()
 959                 {
 960                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
 961                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
 962
 963                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
 964
 965                         if (OptAttributes != null) {
 966                                 Attribute cls_attribute = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, ec);
 967                                 if (cls_attribute != null) {
 968                                         caching_flags |= Flags.HasClsCompliantAttribute;
 969                                         if (cls_attribute.GetClsCompliantAttributeValue (ec)) {
 970                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 971                                                 return true;
 972                                         }
 973                                         return false;
 974                                 }
 975                         }
 976
 977                         if (Parent == null) {
 978                                 if (CodeGen.Assembly.IsClsCompliant) {
 979                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
 980                                         return true;
 981                                 }
 982                                 return false;
 983                         }
 984
 985                         if (Parent.GetClsCompliantAttributeValue ()) {
 986                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 987                                 return true;
 988                         }
 989                         return false;
 990                 }
 991
 992                 public override string[] ValidAttributeTargets {
 993                         get { return attribute_targets; }
 994                 }
 995
 996                 protected override bool VerifyClsCompliance (DeclSpace ds)
 997                 {
 998                         if (!base.VerifyClsCompliance (ds)) {
 999                                 return false;
1000                         }
1001
1002                         IDictionary cache = TypeManager.AllClsTopLevelTypes;
1003                         string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1004                         if (!cache.Contains (lcase)) {
1005                                 cache.Add (lcase, this);
1006                                 return true;
1007                         }
1008
1009                         object val = cache [lcase];
1010                         if (val == null) {
1011                                 Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
1012                                 if (t == null)
1013                                         return true;
1014                                 Report.SymbolRelatedToPreviousError (t);
1015                         }
1016                         else {
1017                                 Report.SymbolRelatedToPreviousError ((DeclSpace)val);
1018                         }
1019                         Report.Error (3005, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1020                         return true;
1021                 }
1022         }
1023
1024         /// <summary>
1025         ///   This is a readonly list of MemberInfo's.
1026         /// </summary>
1027         public class MemberList : IList {
1028                 public readonly IList List;
1029                 int count;
1030
1031                 /// <summary>
1032                 ///   Create a new MemberList from the given IList.
1033                 /// </summary>
1034                 public MemberList (IList list)
1035                 {
1036                         if (list != null)
1037                                 this.List = list;
1038                         else
1039                                 this.List = new ArrayList ();
1040                         count = List.Count;
1041                 }
1042
1043                 /// <summary>
1044                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1045                 /// </summary>
1046                 public MemberList (IList first, IList second)
1047                 {
1048                         ArrayList list = new ArrayList ();
1049                         list.AddRange (first);
1050                         list.AddRange (second);
1051                         count = list.Count;
1052                         List = list;
1053                 }
1054
1055                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1056
1057                 /// <summary>
1058                 ///   Cast the MemberList into a MemberInfo[] array.
1059                 /// </summary>
1060                 /// <remarks>
1061                 ///   This is an expensive operation, only use it if it's really necessary.
1062                 /// </remarks>
1063                 public static explicit operator MemberInfo [] (MemberList list)
1064                 {
1065                         Timer.StartTimer (TimerType.MiscTimer);
1066                         MemberInfo [] result = new MemberInfo [list.Count];
1067                         list.CopyTo (result, 0);
1068                         Timer.StopTimer (TimerType.MiscTimer);
1069                         return result;
1070                 }
1071
1072                 // ICollection
1073
1074                 public int Count {
1075                         get {
1076                                 return count;
1077                         }
1078                 }
1079
1080                 public bool IsSynchronized {
1081                         get {
1082                                 return List.IsSynchronized;
1083                         }
1084                 }
1085
1086                 public object SyncRoot {
1087                         get {
1088                                 return List.SyncRoot;
1089                         }
1090                 }
1091
1092                 public void CopyTo (Array array, int index)
1093                 {
1094                         List.CopyTo (array, index);
1095                 }
1096
1097                 // IEnumerable
1098
1099                 public IEnumerator GetEnumerator ()
1100                 {
1101                         return List.GetEnumerator ();
1102                 }
1103
1104                 // IList
1105
1106                 public bool IsFixedSize {
1107                         get {
1108                                 return true;
1109                         }
1110                 }
1111
1112                 public bool IsReadOnly {
1113                         get {
1114                                 return true;
1115                         }
1116                 }
1117
1118                 object IList.this [int index] {
1119                         get {
1120                                 return List [index];
1121                         }
1122
1123                         set {
1124                                 throw new NotSupportedException ();
1125                         }
1126                 }
1127
1128                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1129                 public MemberInfo this [int index] {
1130                         get {
1131                                 return (MemberInfo) List [index];
1132                         }
1133                 }
1134
1135                 public int Add (object value)
1136                 {
1137                         throw new NotSupportedException ();
1138                 }
1139
1140                 public void Clear ()
1141                 {
1142                         throw new NotSupportedException ();
1143                 }
1144
1145                 public bool Contains (object value)
1146                 {
1147                         return List.Contains (value);
1148                 }
1149
1150                 public int IndexOf (object value)
1151                 {
1152                         return List.IndexOf (value);
1153                 }
1154
1155                 public void Insert (int index, object value)
1156                 {
1157                         throw new NotSupportedException ();
1158                 }
1159
1160                 public void Remove (object value)
1161                 {
1162                         throw new NotSupportedException ();
1163                 }
1164
1165                 public void RemoveAt (int index)
1166                 {
1167                         throw new NotSupportedException ();
1168                 }
1169         }
1170
1171         /// <summary>
1172         ///   This interface is used to get all members of a class when creating the
1173         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1174         ///   want to support the member cache and by TypeHandle to get caching of
1175         ///   non-dynamic types.
1176         /// </summary>
1177         public interface IMemberContainer {
1178                 /// <summary>
1179                 ///   The name of the IMemberContainer.  This is only used for
1180                 ///   debugging purposes.
1181                 /// </summary>
1182                 string Name {
1183                         get;
1184                 }
1185
1186                 /// <summary>
1187                 ///   The type of this IMemberContainer.
1188                 /// </summary>
1189                 Type Type {
1190                         get;
1191                 }
1192
1193                 /// <summary>
1194                 ///   Returns the IMemberContainer of the base class or null if this
1195                 ///   is an interface or TypeManger.object_type.
1196                 ///   This is used when creating the member cache for a class to get all
1197                 ///   members from the base class.
1198                 /// </summary>
1199                 MemberCache BaseCache {
1200                         get;
1201                 }
1202
1203                 /// <summary>
1204                 ///   Whether this is an interface.
1205                 /// </summary>
1206                 bool IsInterface {
1207                         get;
1208                 }
1209
1210                 /// <summary>
1211                 ///   Returns all members of this class with the corresponding MemberTypes
1212                 ///   and BindingFlags.
1213                 /// </summary>
1214                 /// <remarks>
1215                 ///   When implementing this method, make sure not to return any inherited
1216                 ///   members and check the MemberTypes and BindingFlags properly.
1217                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1218                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1219                 ///   MemberInfo class, but the cache needs this information.  That's why
1220                 ///   this method is called multiple times with different BindingFlags.
1221                 /// </remarks>
1222                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1223
1224                 /// <summary>
1225                 ///   Return the container's member cache.
1226                 /// </summary>
1227                 MemberCache MemberCache {
1228                         get;
1229                 }
1230         }
1231
1232         /// <summary>
1233         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1234         ///   member lookups.  It has a member name based hash table; it maps each member
1235         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1236         ///   and the BindingFlags that were initially used to get it.  The cache contains
1237         ///   all members of the current class and all inherited members.  If this cache is
1238         ///   for an interface types, it also contains all inherited members.
1239         ///
1240         ///   There are two ways to get a MemberCache:
1241         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1242         ///     use the DeclSpace.MemberCache property.
1243         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1244         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1245         /// </summary>
1246         public class MemberCache {
1247                 public readonly IMemberContainer Container;
1248                 protected Hashtable member_hash;
1249                 protected Hashtable method_hash;
1250
1251                 /// <summary>
1252                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1253                 /// </summary>
1254                 public MemberCache (IMemberContainer container)
1255                 {
1256                         this.Container = container;
1257
1258                         Timer.IncrementCounter (CounterType.MemberCache);
1259                         Timer.StartTimer (TimerType.CacheInit);
1260
1261                         // If we have a base class (we have a base class unless we're
1262                         // TypeManager.object_type), we deep-copy its MemberCache here.
1263                         if (Container.BaseCache != null)
1264                                 member_hash = SetupCache (Container.BaseCache);
1265                         else
1266                                 member_hash = new Hashtable ();
1267
1268                         // If this is neither a dynamic type nor an interface, create a special
1269                         // method cache with all declared and inherited methods.
1270                         Type type = container.Type;
1271                         if (!(type is TypeBuilder) && !type.IsInterface &&
1272                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1273                                 method_hash = new Hashtable ();
1274                                 AddMethods (type);
1275                         }
1276
1277                         // Add all members from the current class.
1278                         AddMembers (Container);
1279
1280                         Timer.StopTimer (TimerType.CacheInit);
1281                 }
1282
1283                 public MemberCache (Type[] ifaces)
1284                 {
1285                         //
1286                         // The members of this cache all belong to other caches.
1287                         // So, 'Container' will not be used.
1288                         //
1289                         this.Container = null;
1290
1291                         member_hash = new Hashtable ();
1292                         if (ifaces == null)
1293                                 return;
1294
1295                         foreach (Type itype in ifaces)
1296                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1297                 }
1298
1299                 /// <summary>
1300                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1301                 /// </summary>
1302                 Hashtable SetupCache (MemberCache base_class)
1303                 {
1304                         Hashtable hash = new Hashtable ();
1305
1306                         if (base_class == null)
1307                                 return hash;
1308
1309                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1310                         while (it.MoveNext ()) {
1311                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1312                          }
1313
1314                         return hash;
1315                 }
1316
1317                 /// <summary>
1318                 ///   Add the contents of `cache' to the member_hash.
1319                 /// </summary>
1320                 void AddCacheContents (MemberCache cache)
1321                 {
1322                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1323                         while (it.MoveNext ()) {
1324                                 ArrayList list = (ArrayList) member_hash [it.Key];
1325                                 if (list == null)
1326                                         member_hash [it.Key] = list = new ArrayList ();
1327
1328                                 ArrayList entries = (ArrayList) it.Value;
1329                                 for (int i = entries.Count-1; i >= 0; i--) {
1330                                         CacheEntry entry = (CacheEntry) entries [i];
1331
1332                                         if (entry.Container != cache.Container)
1333                                                 break;
1334                                         list.Add (entry);
1335                                 }
1336                         }
1337                 }
1338
1339                 /// <summary>
1340                 ///   Add all members from class `container' to the cache.
1341                 /// </summary>
1342                 void AddMembers (IMemberContainer container)
1343                 {
1344                         // We need to call AddMembers() with a single member type at a time
1345                         // to get the member type part of CacheEntry.EntryType right.
1346                         if (!container.IsInterface) {
1347                                 AddMembers (MemberTypes.Constructor, container);
1348                                 AddMembers (MemberTypes.Field, container);
1349                         }
1350                         AddMembers (MemberTypes.Method, container);
1351                         AddMembers (MemberTypes.Property, container);
1352                         AddMembers (MemberTypes.Event, container);
1353                         // Nested types are returned by both Static and Instance searches.
1354                         AddMembers (MemberTypes.NestedType,
1355                                     BindingFlags.Static | BindingFlags.Public, container);
1356                         AddMembers (MemberTypes.NestedType,
1357                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1358                 }
1359
1360                 void AddMembers (MemberTypes mt, IMemberContainer container)
1361                 {
1362                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1363                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1364                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1365                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1366                 }
1367
1368                 /// <summary>
1369                 ///   Add all members from class `container' with the requested MemberTypes and
1370                 ///   BindingFlags to the cache.  This method is called multiple times with different
1371                 ///   MemberTypes and BindingFlags.
1372                 /// </summary>
1373                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1374                 {
1375                         MemberList members = container.GetMembers (mt, bf);
1376
1377                         foreach (MemberInfo member in members) {
1378                                 string name = member.Name;
1379
1380                                 // We use a name-based hash table of ArrayList's.
1381                                 ArrayList list = (ArrayList) member_hash [name];
1382                                 if (list == null) {
1383                                         list = new ArrayList ();
1384                                         member_hash.Add (name, list);
1385                                 }
1386
1387                                 // When this method is called for the current class, the list will
1388                                 // already contain all inherited members from our base classes.
1389                                 // We cannot add new members in front of the list since this'd be an
1390                                 // expensive operation, that's why the list is sorted in reverse order
1391                                 // (ie. members from the current class are coming last).
1392                                 list.Add (new CacheEntry (container, member, mt, bf));
1393                         }
1394                 }
1395
1396                 /// <summary>
1397                 ///   Add all declared and inherited methods from class `type' to the method cache.
1398                 /// </summary>
1399                 void AddMethods (Type type)
1400                 {
1401                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1402                                     BindingFlags.FlattenHierarchy, type);
1403                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1404                                     BindingFlags.FlattenHierarchy, type);
1405                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1406                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1407                 }
1408
1409                 static ArrayList overrides = new ArrayList ();
1410
1411                 void AddMethods (BindingFlags bf, Type type)
1412                 {
1413                         MethodBase [] members = type.GetMethods (bf);
1414
1415                         Array.Reverse (members);
1416
1417                         foreach (MethodBase member in members) {
1418                                 string name = member.Name;
1419
1420                                 // We use a name-based hash table of ArrayList's.
1421                                 ArrayList list = (ArrayList) method_hash [name];
1422                                 if (list == null) {
1423                                         list = new ArrayList ();
1424                                         method_hash.Add (name, list);
1425                                 }
1426
1427                                 MethodInfo curr = (MethodInfo) member;
1428                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1429                                         MethodInfo base_method = curr.GetBaseDefinition ();
1430
1431                                         if (base_method == curr)
1432                                                 // Not every virtual function needs to have a NewSlot flag.
1433                                                 break;
1434
1435                                         overrides.Add (curr);
1436                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1437                                         curr = base_method;
1438                                 }
1439
1440                                 if (overrides.Count > 0) {
1441                                         for (int i = 0; i < overrides.Count; ++i)
1442                                                 TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
1443                                         overrides.Clear ();
1444                                 }
1445
1446                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1447                                 // sorted so we need to do this check for every member.
1448                                 BindingFlags new_bf = bf;
1449                                 if (member.DeclaringType == type)
1450                                         new_bf |= BindingFlags.DeclaredOnly;
1451
1452                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1453                         }
1454                 }
1455
1456                 /// <summary>
1457                 ///   Compute and return a appropriate `EntryType' magic number for the given
1458                 ///   MemberTypes and BindingFlags.
1459                 /// </summary>
1460                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1461                 {
1462                         EntryType type = EntryType.None;
1463
1464                         if ((mt & MemberTypes.Constructor) != 0)
1465                                 type |= EntryType.Constructor;
1466                         if ((mt & MemberTypes.Event) != 0)
1467                                 type |= EntryType.Event;
1468                         if ((mt & MemberTypes.Field) != 0)
1469                                 type |= EntryType.Field;
1470                         if ((mt & MemberTypes.Method) != 0)
1471                                 type |= EntryType.Method;
1472                         if ((mt & MemberTypes.Property) != 0)
1473                                 type |= EntryType.Property;
1474                         // Nested types are returned by static and instance searches.
1475                         if ((mt & MemberTypes.NestedType) != 0)
1476                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1477
1478                         if ((bf & BindingFlags.Instance) != 0)
1479                                 type |= EntryType.Instance;
1480                         if ((bf & BindingFlags.Static) != 0)
1481                                 type |= EntryType.Static;
1482                         if ((bf & BindingFlags.Public) != 0)
1483                                 type |= EntryType.Public;
1484                         if ((bf & BindingFlags.NonPublic) != 0)
1485                                 type |= EntryType.NonPublic;
1486                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1487                                 type |= EntryType.Declared;
1488
1489                         return type;
1490                 }
1491
1492                 /// <summary>
1493                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1494                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1495                 ///   single member types.
1496                 /// </summary>
1497                 public static bool IsSingleMemberType (MemberTypes mt)
1498                 {
1499                         switch (mt) {
1500                         case MemberTypes.Constructor:
1501                         case MemberTypes.Event:
1502                         case MemberTypes.Field:
1503                         case MemberTypes.Method:
1504                         case MemberTypes.Property:
1505                         case MemberTypes.NestedType:
1506                                 return true;
1507
1508                         default:
1509                                 return false;
1510                         }
1511                 }
1512
1513                 /// <summary>
1514                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1515                 ///   number to speed up the searching process.
1516                 /// </summary>
1517                 [Flags]
1518                 protected enum EntryType {
1519                         None            = 0x000,
1520
1521                         Instance        = 0x001,
1522                         Static          = 0x002,
1523                         MaskStatic      = Instance|Static,
1524
1525                         Public          = 0x004,
1526                         NonPublic       = 0x008,
1527                         MaskProtection  = Public|NonPublic,
1528
1529                         Declared        = 0x010,
1530
1531                         Constructor     = 0x020,
1532                         Event           = 0x040,
1533                         Field           = 0x080,
1534                         Method          = 0x100,
1535                         Property        = 0x200,
1536                         NestedType      = 0x400,
1537
1538                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1539                 }
1540
1541                 protected class CacheEntry {
1542                         public readonly IMemberContainer Container;
1543                         public readonly EntryType EntryType;
1544                         public readonly MemberInfo Member;
1545
1546                         public CacheEntry (IMemberContainer container, MemberInfo member,
1547                                            MemberTypes mt, BindingFlags bf)
1548                         {
1549                                 this.Container = container;
1550                                 this.Member = member;
1551                                 this.EntryType = GetEntryType (mt, bf);
1552                         }
1553
1554                         public override string ToString ()
1555                         {
1556                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1557                                                       EntryType, Member);
1558                         }
1559                 }
1560
1561                 /// <summary>
1562                 ///   This is called each time we're walking up one level in the class hierarchy
1563                 ///   and checks whether we can abort the search since we've already found what
1564                 ///   we were looking for.
1565                 /// </summary>
1566                 protected bool DoneSearching (ArrayList list)
1567                 {
1568                         //
1569                         // We've found exactly one member in the current class and it's not
1570                         // a method or constructor.
1571                         //
1572                         if (list.Count == 1 && !(list [0] is MethodBase))
1573                                 return true;
1574
1575                         //
1576                         // Multiple properties: we query those just to find out the indexer
1577                         // name
1578                         //
1579                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1580                                 return true;
1581
1582                         return false;
1583                 }
1584
1585                 /// <summary>
1586                 ///   Looks up members with name `name'.  If you provide an optional
1587                 ///   filter function, it'll only be called with members matching the
1588                 ///   requested member name.
1589                 ///
1590                 ///   This method will try to use the cache to do the lookup if possible.
1591                 ///
1592                 ///   Unlike other FindMembers implementations, this method will always
1593                 ///   check all inherited members - even when called on an interface type.
1594                 ///
1595                 ///   If you know that you're only looking for methods, you should use
1596                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1597                 ///   When doing a method-only search, it'll try to use a special method
1598                 ///   cache (unless it's a dynamic type or an interface) and the returned
1599                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1600                 ///   The lookup process will automatically restart itself in method-only
1601                 ///   search mode if it discovers that it's about to return methods.
1602                 /// </summary>
1603                 ArrayList global = new ArrayList ();
1604                 bool using_global = false;
1605
1606                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1607
1608                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1609                                                   MemberFilter filter, object criteria)
1610                 {
1611                         if (using_global)
1612                                 throw new Exception ();
1613
1614                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1615                         bool method_search = mt == MemberTypes.Method;
1616                         // If we have a method cache and we aren't already doing a method-only search,
1617                         // then we restart a method search if the first match is a method.
1618                         bool do_method_search = !method_search && (method_hash != null);
1619
1620                         ArrayList applicable;
1621
1622                         // If this is a method-only search, we try to use the method cache if
1623                         // possible; a lookup in the method cache will return a MemberInfo with
1624                         // the correct ReflectedType for inherited methods.
1625
1626                         if (method_search && (method_hash != null))
1627                                 applicable = (ArrayList) method_hash [name];
1628                         else
1629                                 applicable = (ArrayList) member_hash [name];
1630
1631                         if (applicable == null)
1632                                 return emptyMemberInfo;
1633
1634                         //
1635                         // 32  slots gives 53 rss/54 size
1636                         // 2/4 slots gives 55 rss
1637                         //
1638                         // Strange: from 25,000 calls, only 1,800
1639                         // are above 2.  Why does this impact it?
1640                         //
1641                         global.Clear ();
1642                         using_global = true;
1643
1644                         Timer.StartTimer (TimerType.CachedLookup);
1645
1646                         EntryType type = GetEntryType (mt, bf);
1647
1648                         IMemberContainer current = Container;
1649
1650
1651                         // `applicable' is a list of all members with the given member name `name'
1652                         // in the current class and all its base classes.  The list is sorted in
1653                         // reverse order due to the way how the cache is initialy created (to speed
1654                         // things up, we're doing a deep-copy of our base).
1655
1656                         for (int i = applicable.Count-1; i >= 0; i--) {
1657                                 CacheEntry entry = (CacheEntry) applicable [i];
1658
1659                                 // This happens each time we're walking one level up in the class
1660                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
1661                                 // the first time this happens (this may already happen in the first
1662                                 // iteration of this loop if there are no members with the name we're
1663                                 // looking for in the current class).
1664                                 if (entry.Container != current) {
1665                                         if (declared_only || DoneSearching (global))
1666                                                 break;
1667
1668                                         current = entry.Container;
1669                                 }
1670
1671                                 // Is the member of the correct type ?
1672                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
1673                                         continue;
1674
1675                                 // Is the member static/non-static ?
1676                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
1677                                         continue;
1678
1679                                 // Apply the filter to it.
1680                                 if (filter (entry.Member, criteria)) {
1681                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
1682                                                 do_method_search = false;
1683                                         global.Add (entry.Member);
1684                                 }
1685                         }
1686
1687                         Timer.StopTimer (TimerType.CachedLookup);
1688
1689                         // If we have a method cache and we aren't already doing a method-only
1690                         // search, we restart in method-only search mode if the first match is
1691                         // a method.  This ensures that we return a MemberInfo with the correct
1692                         // ReflectedType for inherited methods.
1693                         if (do_method_search && (global.Count > 0)){
1694                                 using_global = false;
1695
1696                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
1697                         }
1698
1699                         using_global = false;
1700                         MemberInfo [] copy = new MemberInfo [global.Count];
1701                         global.CopyTo (copy);
1702                         return copy;
1703                 }
1704
1705                 // find the nested type @name in @this.
1706                 public Type FindNestedType (string name)
1707                 {
1708                         ArrayList applicable = (ArrayList) member_hash [name];
1709                         if (applicable == null)
1710                                 return null;
1711
1712                         for (int i = applicable.Count-1; i >= 0; i--) {
1713                                 CacheEntry entry = (CacheEntry) applicable [i];
1714                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
1715                                         return (Type) entry.Member;
1716                         }
1717
1718                         return null;
1719                 }
1720
1721                 //
1722                 // This finds the method or property for us to override. invocationType is the type where
1723                 // the override is going to be declared, name is the name of the method/property, and
1724                 // paramTypes is the parameters, if any to the method or property
1725                 //
1726                 // Because the MemberCache holds members from this class and all the base classes,
1727                 // we can avoid tons of reflection stuff.
1728                 //
1729                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
1730                 {
1731                         ArrayList applicable;
1732                         if (method_hash != null && !is_property)
1733                                 applicable = (ArrayList) method_hash [name];
1734                         else
1735                                 applicable = (ArrayList) member_hash [name];
1736
1737                         if (applicable == null)
1738                                 return null;
1739                         //
1740                         // Walk the chain of methods, starting from the top.
1741                         //
1742                         for (int i = applicable.Count - 1; i >= 0; i--) {
1743                                 CacheEntry entry = (CacheEntry) applicable [i];
1744
1745                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
1746                                         continue;
1747
1748                                 PropertyInfo pi = null;
1749                                 MethodInfo mi = null;
1750                                 FieldInfo fi = null;
1751                                 Type [] cmpAttrs = null;
1752
1753                                 if (is_property) {
1754                                         if ((entry.EntryType & EntryType.Field) != 0) {
1755                                                 fi = (FieldInfo)entry.Member;
1756
1757                                                 // TODO: For this case we ignore member type
1758                                                 //fb = TypeManager.GetField (fi);
1759                                                 //cmpAttrs = new Type[] { fb.MemberType };
1760                                         } else {
1761                                                 pi = (PropertyInfo) entry.Member;
1762                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
1763                                         }
1764                                 } else {
1765                                         mi = (MethodInfo) entry.Member;
1766                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
1767                                 }
1768
1769                                 if (fi != null) {
1770                                         // TODO: Almost duplicate !
1771                                         // Check visibility
1772                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
1773                                                 case FieldAttributes.Private:
1774                                                         //
1775                                                         // A private method is Ok if we are a nested subtype.
1776                                                         // The spec actually is not very clear about this, see bug 52458.
1777                                                         //
1778                                                         if (invocationType != entry.Container.Type &
1779                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1780                                                                 continue;
1781
1782                                                         break;
1783                                                 case FieldAttributes.FamANDAssem:
1784                                                 case FieldAttributes.Assembly:
1785                                                         //
1786                                                         // Check for assembly methods
1787                                                         //
1788                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
1789                                                                 continue;
1790                                                         break;
1791                                         }
1792                                         return entry.Member;
1793                                 }
1794
1795                                 //
1796                                 // Check the arguments
1797                                 //
1798                                 if (cmpAttrs.Length != paramTypes.Length)
1799                                         continue;
1800
1801                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --)
1802                                         if (paramTypes [j] != cmpAttrs [j])
1803                                                 goto next;
1804
1805                                 //
1806                                 // get one of the methods because this has the visibility info.
1807                                 //
1808                                 if (is_property) {
1809                                         mi = pi.GetGetMethod (true);
1810                                         if (mi == null)
1811                                                 mi = pi.GetSetMethod (true);
1812                                 }
1813
1814                                 //
1815                                 // Check visibility
1816                                 //
1817                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
1818                                 case MethodAttributes.Private:
1819                                         //
1820                                         // A private method is Ok if we are a nested subtype.
1821                                         // The spec actually is not very clear about this, see bug 52458.
1822                                         //
1823                                         if (invocationType == entry.Container.Type ||
1824                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1825                                                 return entry.Member;
1826
1827                                         break;
1828                                 case MethodAttributes.FamANDAssem:
1829                                 case MethodAttributes.Assembly:
1830                                         //
1831                                         // Check for assembly methods
1832                                         //
1833                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
1834                                                 return entry.Member;
1835
1836                                         break;
1837                                 default:
1838                                         //
1839                                         // A protected method is ok, because we are overriding.
1840                                         // public is always ok.
1841                                         //
1842                                         return entry.Member;
1843                                 }
1844                         next:
1845                                 ;
1846                         }
1847
1848                         return null;
1849                 }
1850
1851                 /// <summary>
1852                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
1853                 /// We handle two cases. The first is for types without parameters (events, field, properties).
1854                 /// The second are methods, indexers and this is why ignore_complex_types is here.
1855                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
1856                 /// </summary>
1857                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
1858                 {
1859                         ArrayList applicable = null;
1860
1861                         if (method_hash != null)
1862                                 applicable = (ArrayList) method_hash [name];
1863
1864                         if (applicable != null) {
1865                                 for (int i = applicable.Count - 1; i >= 0; i--) {
1866                                         CacheEntry entry = (CacheEntry) applicable [i];
1867                                         if ((entry.EntryType & EntryType.Public) != 0)
1868                                                 return entry.Member;
1869                                 }
1870                         }
1871
1872                         if (member_hash == null)
1873                                 return null;
1874                         applicable = (ArrayList) member_hash [name];
1875
1876                         if (applicable != null) {
1877                                 for (int i = applicable.Count - 1; i >= 0; i--) {
1878                                         CacheEntry entry = (CacheEntry) applicable [i];
1879                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
1880                                                 if (ignore_complex_types) {
1881                                                         if ((entry.EntryType & EntryType.Method) != 0)
1882                                                                 continue;
1883
1884                                                         // Does exist easier way how to detect indexer ?
1885                                                         if ((entry.EntryType & EntryType.Property) != 0) {
1886                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
1887                                                                 if (arg_types.Length > 0)
1888                                                                         continue;
1889                                                         }
1890                                                 }
1891                                                 return entry.Member;
1892                                         }
1893                                 }
1894                         }
1895                         return null;
1896                 }
1897
1898                 Hashtable locase_table;
1899
1900                 /// <summary>
1901                 /// Builds low-case table for CLS Compliance test
1902                 /// </summary>
1903                 public Hashtable GetPublicMembers ()
1904                 {
1905                         if (locase_table != null)
1906                                 return locase_table;
1907
1908                         locase_table = new Hashtable ();
1909                         foreach (DictionaryEntry entry in member_hash) {
1910                                 ArrayList members = (ArrayList)entry.Value;
1911                                 for (int ii = 0; ii < members.Count; ++ii) {
1912                                         CacheEntry member_entry = (CacheEntry) members [ii];
1913
1914                                         if ((member_entry.EntryType & EntryType.Public) == 0)
1915                                                 continue;
1916
1917                                         // TODO: Does anyone know easier way how to detect that member is internal ?
1918                                         switch (member_entry.EntryType & EntryType.MaskType) {
1919                                                 case EntryType.Constructor:
1920                                                         continue;
1921
1922                                                 case EntryType.Field:
1923                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
1924                                                                 continue;
1925                                                         break;
1926
1927                                                 case EntryType.Method:
1928                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
1929                                                                 continue;
1930                                                         break;
1931
1932                                                 case EntryType.Property:
1933                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
1934                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
1935                                                                 continue;
1936                                                         break;
1937
1938                                                 case EntryType.Event:
1939                                                         EventInfo ei = (EventInfo)member_entry.Member;
1940                                                         MethodInfo mi = ei.GetAddMethod ();
1941                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
1942                                                                 continue;
1943                                                         break;
1944                                         }
1945                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
1946                                         locase_table [lcase] = member_entry.Member;
1947                                         break;
1948                                 }
1949                         }
1950                         return locase_table;
1951                 }
1952
1953                 public Hashtable Members {
1954                         get {
1955                                 return member_hash;
1956                         }
1957                 }
1958
1959                 /// <summary>
1960                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
1961                 /// </summary>
1962                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
1963                 {
1964                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
1965
1966                         for (int i = 0; i < al.Count; ++i) {
1967                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
1968
1969                                 // skip itself
1970                                 if (entry.Member == this_builder)
1971                                         continue;
1972
1973                                 if ((entry.EntryType & tested_type) != tested_type)
1974                                         continue;
1975
1976                                 MethodBase method_to_compare = (MethodBase)entry.Member;
1977                                 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
1978                                         method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare));
1979
1980                                 if (result == AttributeTester.Result.Ok)
1981                                         continue;
1982
1983                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
1984
1985                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
1986                                 // However it is exactly what csc does.
1987                                 if (md != null && !md.IsClsCompliaceRequired (method.Parent))
1988                                         continue;
1989
1990                                 Report.SymbolRelatedToPreviousError (entry.Member);
1991                                 switch (result) {
1992                                         case AttributeTester.Result.RefOutArrayError:
1993                                                 Report.Error (3006, method.Location, "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
1994                                                 continue;
1995                                         case AttributeTester.Result.ArrayArrayError:
1996                                                 Report.Error (3007, method.Location, "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant", method.GetSignatureForError ());
1997                                                 continue;
1998                                 }
1999
2000                                 throw new NotImplementedException (result.ToString ());
2001                         }
2002                 }
2003         }
2004 }