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                 public readonly Location Location;
  33
  34                 bool is_double_colon;
  35
  36                 public static readonly MemberName Null = new MemberName ("");
  37
  38                 private MemberName (MemberName left, string name, bool is_double_colon, Location loc)
  39                 {
  40                         this.Name = name;
  41                         this.Location = loc;
  42                         this.is_double_colon = is_double_colon;
  43                         this.Left = left;
  44                 }
  45
  46                 public MemberName (string name)
  47                         : this (null, name, false, Location.Null)
  48                 {
  49                 }
  50
  51                 public MemberName (MemberName left, string name)
  52                         : this (left, name, false, left != null ? left.Location : Location.Null)
  53                 {
  54                 }
  55
  56                 public MemberName (string name, Location loc)
  57                         : this (null, name, false, loc)
  58                 {
  59                 }
  60
  61                 public MemberName (MemberName left, string name, Location loc)
  62                         : this (left, name, false, loc)
  63                 {
  64                 }
  65
  66                 public MemberName (string alias, string name, Location loc)
  67                         : this (new MemberName (alias), name, true, loc)
  68                 {
  69                 }
  70
  71                 public MemberName (MemberName left, MemberName right)
  72                         : this (left, right, right.Location)
  73                 {
  74                 }
  75
  76                 public MemberName (MemberName left, MemberName right, Location loc)
  77                         : this (null, right.Name, false, loc)
  78                 {
  79                         if (right.is_double_colon)
  80                                 throw new InternalErrorException ("Cannot append double_colon member name");
  81                         this.Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  82                 }
  83
  84                 static readonly char [] dot_array = { '.' };
  85
  86                 public static MemberName FromDotted (string name)
  87                 {
  88                         string [] elements = name.Split (dot_array);
  89                         int count = elements.Length;
  90                         int i = 0;
  91                         MemberName n = new MemberName (elements [i++]);
  92                         while (i < count)
  93                                 n = new MemberName (n, elements [i++]);
  94                         return n;
  95                 }
  96
  97                 public string GetName ()
  98                 {
  99                         return GetName (false);
 100                 }
 101
 102                 public string GetName (bool is_generic)
 103                 {
 104                         string name = is_generic ? Basename : Name;
 105                         string connect = is_double_colon ? "::" : ".";
 106                         if (Left != null)
 107                                 return Left.GetName (is_generic) + connect + name;
 108                         else
 109                                 return name;
 110                 }
 111
 112                 ///
 113                 /// This returns exclusively the name as seen on the source code
 114                 /// it is not the fully qualifed type after resolution
 115                 ///
 116                 public string GetPartialName ()
 117                 {
 118                         string connect = is_double_colon ? "::" : ".";
 119                         if (Left != null)
 120                                 return Left.GetPartialName () + connect + Name;
 121                         else
 122                                 return Name;
 123                 }
 124
 125                 public string GetTypeName ()
 126                 {
 127                         string connect = is_double_colon ? "::" : ".";
 128                         if (Left != null)
 129                                 return Left.GetTypeName () + connect + Name;
 130                         else
 131                                 return Name;
 132                 }
 133
 134                 public Expression GetTypeExpression ()
 135                 {
 136                         if (Left == null)
 137                                 return new SimpleName (Name, Location);
 138                         if (is_double_colon) {
 139                                 if (Left.Left != null)
 140                                         throw new InternalErrorException ("The left side of a :: should be an identifier");
 141                                 return new QualifiedAliasMember (Left.Name, Name, Location);
 142                         }
 143
 144                         Expression lexpr = Left.GetTypeExpression ();
 145                         return new MemberAccess (lexpr, Name, Location);
 146                 }
 147
 148                 public MemberName Clone ()
 149                 {
 150                         MemberName left_clone = Left == null ? null : Left.Clone ();
 151                         return new MemberName (left_clone, Name, is_double_colon, Location);
 152                 }
 153
 154                 public string Basename {
 155                         get { return Name; }
 156                 }
 157
 158                 public override string ToString ()
 159                 {
 160                         string connect = is_double_colon ? "::" : ".";
 161                         if (Left != null)
 162                                 return Left + connect + Name;
 163                         else
 164                                 return Name;
 165                 }
 166
 167                 public override bool Equals (object other)
 168                 {
 169                         return Equals (other as MemberName);
 170                 }
 171
 172                 public bool Equals (MemberName other)
 173                 {
 174                         if (this == other)
 175                                 return true;
 176                         if (other == null || Name != other.Name)
 177                                 return false;
 178                         if (is_double_colon != other.is_double_colon)
 179                                 return false;
 180 #if NET_2_0
 181                         if (TypeArguments == null)
 182                                 return other.TypeArguments == null;
 183
 184                         if (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count)
 185                                 return false;
 186 #endif
 187                         if (Left == null)
 188                                 return other.Left == null;
 189
 190                         return Left.Equals (other.Left);
 191                 }
 192
 193                 public override int GetHashCode ()
 194                 {
 195                         int hash = Name.GetHashCode ();
 196                         for (MemberName n = Left; n != null; n = n.Left)
 197                                 hash ^= n.Name.GetHashCode ();
 198                         if (is_double_colon)
 199                                 hash ^= 0xbadc01d;
 200 #if NET_2_0
 201                         if (TypeArguments != null)
 202                                 hash ^= TypeArguments.Count << 5;
 203 #endif
 204
 205                         return hash & 0x7FFFFFFF;
 206                 }
 207         }
 208
 209         /// <summary>
 210         ///   Base representation for members.  This is used to keep track
 211         ///   of Name, Location and Modifier flags, and handling Attributes.
 212         /// </summary>
 213         public abstract class MemberCore : Attributable {
 214                 /// <summary>
 215                 ///   Public name
 216                 /// </summary>
 217
 218                 protected string cached_name;
 219                 public string Name {
 220                         get {
 221                                 if (cached_name == null)
 222                                         cached_name = MemberName.GetName (false);
 223                                 return cached_name;
 224                         }
 225                 }
 226
 227                 // Is not readonly because of IndexerName attribute
 228                 private MemberName member_name;
 229                 public MemberName MemberName {
 230                         get { return member_name; }
 231                 }
 232
 233                 /// <summary>
 234                 ///   Modifier flags that the user specified in the source code
 235                 /// </summary>
 236                 public int ModFlags;
 237
 238                 public /*readonly*/ TypeContainer Parent;
 239
 240                 /// <summary>
 241                 ///   Location where this declaration happens
 242                 /// </summary>
 243                 public Location Location {
 244                         get { return member_name.Location; }
 245                 }
 246
 247                 /// <summary>
 248                 ///   XML documentation comment
 249                 /// </summary>
 250                 public string DocComment;
 251
 252                 /// <summary>
 253                 ///   Represents header string for documentation comment
 254                 ///   for each member types.
 255                 /// </summary>
 256                 public abstract string DocCommentHeader { get; }
 257
 258                 [Flags]
 259                 public enum Flags {
 260                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 261                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 262                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 263                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 264                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 265                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 266                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 267                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 268                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 269                         Excluded = 1 << 9,                                      // Method is conditional
 270                         TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
 271                         IsUsed = 1 << 11,
 272                         IsAssigned = 1 << 12                            // Field is assigned
 273                 }
 274
 275                 /// <summary>
 276                 ///   MemberCore flags at first detected then cached
 277                 /// </summary>
 278                 internal Flags caching_flags;
 279
 280                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs)
 281                         : base (attrs)
 282                 {
 283                         if (parent is PartialContainer && !(this is PartialContainer))
 284                                 throw new InternalErrorException ("A PartialContainer cannot be the direct parent of a member");
 285
 286                         Parent = parent;
 287                         member_name = name;
 288                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 289                 }
 290
 291                 protected virtual void SetMemberName (MemberName new_name)
 292                 {
 293                         member_name = new_name;
 294                         cached_name = null;
 295                 }
 296
 297                 /// <summary>
 298                 /// Tests presence of ObsoleteAttribute and report proper error
 299                 /// </summary>
 300                 protected void CheckUsageOfObsoleteAttribute (Type type)
 301                 {
 302                         if (type == null)
 303                                 return;
 304
 305                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
 306                         if (obsolete_attr == null)
 307                                 return;
 308
 309                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
 310                 }
 311
 312                 public abstract bool Define ();
 313
 314                 //
 315                 // Returns full member name for error message
 316                 //
 317                 public virtual string GetSignatureForError ()
 318                 {
 319                         if (Parent == null || Parent.Parent == null)
 320                                 return Name;
 321
 322                         return String.Concat (Parent.GetSignatureForError (), '.', Name);
 323                 }
 324
 325                 /// <summary>
 326                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 327                 /// </summary>
 328                 public virtual void Emit ()
 329                 {
 330                         // Hack with Parent == null is for EnumMember
 331                         if (Parent == null || (GetObsoleteAttribute (Parent) == null && Parent.GetObsoleteAttribute (Parent) == null))
 332                                 VerifyObsoleteAttribute ();
 333
 334                         if (!RootContext.VerifyClsCompliance)
 335                                 return;
 336
 337                         VerifyClsCompliance (Parent);
 338                 }
 339
 340                 public bool InUnsafe {
 341                         get {
 342                                 return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
 343                         }
 344                 }
 345
 346                 public virtual bool IsUsed {
 347                         get {
 348                                 return (caching_flags & Flags.IsUsed) != 0;
 349                         }
 350                 }
 351
 352                 public void SetMemberIsUsed ()
 353                 {
 354                         caching_flags |= Flags.IsUsed;
 355                 }
 356
 357                 //
 358                 // Whehter is it ok to use an unsafe pointer in this type container
 359                 //
 360                 public bool UnsafeOK (DeclSpace parent)
 361                 {
 362                         //
 363                         // First check if this MemberCore modifier flags has unsafe set
 364                         //
 365                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 366                                 return true;
 367
 368                         if (parent.UnsafeContext)
 369                                 return true;
 370
 371                         Expression.UnsafeError (Location);
 372                         return false;
 373                 }
 374
 375                 /// <summary>
 376                 /// Returns instance of ObsoleteAttribute for this MemberCore
 377                 /// </summary>
 378                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 379                 {
 380                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 381                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 382                                 return null;
 383                         }
 384
 385                         caching_flags &= ~Flags.Obsolete_Undetected;
 386
 387                         if (OptAttributes == null)
 388                                 return null;
 389
 390                         Attribute obsolete_attr = OptAttributes.Search (
 391                                 TypeManager.obsolete_attribute_type, ds.EmitContext);
 392                         if (obsolete_attr == null)
 393                                 return null;
 394
 395                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds.EmitContext);
 396                         if (obsolete == null)
 397                                 return null;
 398
 399                         caching_flags |= Flags.Obsolete;
 400                         return obsolete;
 401                 }
 402
 403                 /// <summary>
 404                 /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
 405                 /// </summary>
 406                 public void CheckObsoleteness (Location loc)
 407                 {
 408                         ObsoleteAttribute oa = GetObsoleteAttribute (Parent);
 409                         if (oa == null) {
 410                                 return;
 411                         }
 412
 413                         AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc);
 414                 }
 415
 416                 /// <summary>
 417                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 418                 /// </summary>
 419                 public override bool IsClsCompliaceRequired (DeclSpace container)
 420                 {
 421                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 422                                 return (caching_flags & Flags.ClsCompliant) != 0;
 423
 424                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 425                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 426                                 caching_flags |= Flags.ClsCompliant;
 427                                 return true;
 428                         }
 429
 430                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 431                         return false;
 432                 }
 433
 434                 /// <summary>
 435                 /// Returns true when MemberCore is exposed from assembly.
 436                 /// </summary>
 437                 public bool IsExposedFromAssembly (DeclSpace ds)
 438                 {
 439                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 440                                 return false;
 441
 442                         DeclSpace parentContainer = ds;
 443                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 444                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 445                                         return false;
 446                                 parentContainer = parentContainer.Parent;
 447                         }
 448                         return true;
 449                 }
 450
 451                 /// <summary>
 452                 /// Resolve CLSCompliantAttribute value or gets cached value.
 453                 /// </summary>
 454                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 455                 {
 456                         if (OptAttributes != null) {
 457                                 Attribute cls_attribute = OptAttributes.Search (
 458                                         TypeManager.cls_compliant_attribute_type, ds.EmitContext);
 459                                 if (cls_attribute != null) {
 460                                         caching_flags |= Flags.HasClsCompliantAttribute;
 461                                         return cls_attribute.GetClsCompliantAttributeValue (ds.EmitContext);
 462                                 }
 463                         }
 464                         return ds.GetClsCompliantAttributeValue ();
 465                 }
 466
 467                 /// <summary>
 468                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 469                 /// </summary>
 470                 protected bool HasClsCompliantAttribute {
 471                         get {
 472                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 473                         }
 474                 }
 475
 476                 /// <summary>
 477                 /// It helps to handle error 102 & 111 detection
 478                 /// </summary>
 479                 public virtual bool MarkForDuplicationCheck ()
 480                 {
 481                         return false;
 482                 }
 483
 484                 /// <summary>
 485                 /// The main virtual method for CLS-Compliant verifications.
 486                 /// The method returns true if member is CLS-Compliant and false if member is not
 487                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 488                 /// and add their extra verifications.
 489                 /// </summary>
 490                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 491                 {
 492                         if (!IsClsCompliaceRequired (ds)) {
 493                                 if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
 494                                         if (!IsExposedFromAssembly (ds))
 495                                                 Report.Warning (3019, Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
 496                                         if (!CodeGen.Assembly.IsClsCompliant)
 497                                                 Report.Warning (3021, Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
 498                                 }
 499                                 return false;
 500                         }
 501
 502                         if (!CodeGen.Assembly.IsClsCompliant) {
 503                                 if (HasClsCompliantAttribute) {
 504                                         Report.Error (3014, Location,
 505                                                 "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 506                                                 GetSignatureForError ());
 507                                 }
 508                                 return false;
 509                         }
 510
 511                         if (member_name.Name [0] == '_') {
 512                                 Report.Error (3008, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 513                         }
 514                         return true;
 515                 }
 516
 517                 protected abstract void VerifyObsoleteAttribute ();
 518
 519                 //
 520                 // Raised (and passed an XmlElement that contains the comment)
 521                 // when GenerateDocComment is writing documentation expectedly.
 522                 //
 523                 internal virtual void OnGenerateDocComment (DeclSpace ds, XmlElement intermediateNode)
 524                 {
 525                 }
 526
 527                 //
 528                 // Returns a string that represents the signature for this
 529                 // member which should be used in XML documentation.
 530                 //
 531                 public virtual string GetDocCommentName (DeclSpace ds)
 532                 {
 533                         if (ds == null || this is DeclSpace)
 534                                 return DocCommentHeader + Name;
 535                         else
 536                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 537                 }
 538
 539                 //
 540                 // Generates xml doc comments (if any), and if required,
 541                 // handle warning report.
 542                 //
 543                 internal virtual void GenerateDocComment (DeclSpace ds)
 544                 {
 545                         DocUtil.GenerateDocComment (this, ds);
 546                 }
 547         }
 548
 549         /// <summary>
 550         ///   Base class for structs, classes, enumerations and interfaces.
 551         /// </summary>
 552         /// <remarks>
 553         ///   They all create new declaration spaces.  This
 554         ///   provides the common foundation for managing those name
 555         ///   spaces.
 556         /// </remarks>
 557         public abstract class DeclSpace : MemberCore {
 558                 /// <summary>
 559                 ///   This points to the actual definition that is being
 560                 ///   created with System.Reflection.Emit
 561                 /// </summary>
 562                 public TypeBuilder TypeBuilder;
 563
 564                 //
 565                 // This is the namespace in which this typecontainer
 566                 // was declared.  We use this to resolve names.
 567                 //
 568                 public NamespaceEntry NamespaceEntry;
 569
 570                 private Hashtable Cache = new Hashtable ();
 571
 572                 public string Basename;
 573
 574                 protected Hashtable defined_names;
 575
 576                 // The emit context for toplevel objects.
 577                 protected EmitContext ec;
 578
 579                 public EmitContext EmitContext {
 580                         get { return ec; }
 581                 }
 582
 583                 static string[] attribute_targets = new string [] { "type" };
 584
 585                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 586                                   Attributes attrs)
 587                         : base (parent, name, attrs)
 588                 {
 589                         NamespaceEntry = ns;
 590                         Basename = name.Name;
 591                         defined_names = new Hashtable ();
 592                 }
 593
 594                 /// <summary>
 595                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 596                 /// </summary>
 597                 protected bool AddToContainer (MemberCore symbol, string name)
 598                 {
 599                         if (name == Basename && !(this is Interface) && !(this is Enum)) {
 600                                 Report.SymbolRelatedToPreviousError (this);
 601                                 Report.Error (542,  symbol.Location, "`{0}': member names cannot be the same as their enclosing type", symbol.GetSignatureForError ());
 602                                 return false;
 603                         }
 604
 605                         MemberCore mc = (MemberCore) defined_names [name];
 606
 607                         if (mc == null) {
 608                                 defined_names.Add (name, symbol);
 609                                 return true;
 610                         }
 611
 612                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 613                                 return true;
 614
 615                         Report.SymbolRelatedToPreviousError (mc);
 616                         if (symbol is PartialContainer || mc is PartialContainer) {
 617                                 Report.Error (260, symbol.Location,
 618                                         "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
 619                                         name);
 620                                 return false;
 621                         }
 622
 623                         if (this is RootTypes) {
 624                                 Report.Error (101, symbol.Location,
 625                                         "The namespace `{0}' already contains a definition for `{1}'",
 626                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
 627                         } else {
 628                                 Report.Error (102, symbol.Location, "The type `{0}' already contains a definition for `{1}'",
 629                                         GetSignatureForError (), symbol.MemberName.Name);
 630                         }
 631                         return false;
 632                 }
 633
 634                 /// <summary>
 635                 ///   Returns the MemberCore associated with a given name in the declaration
 636                 ///   space. It doesn't return method based symbols !!
 637                 /// </summary>
 638                 ///
 639                 public MemberCore GetDefinition (string name)
 640                 {
 641                         return (MemberCore)defined_names [name];
 642                 }
 643
 644                 //
 645                 // root_types contains all the types.  All TopLevel types
 646                 // hence have a parent that points to `root_types', that is
 647                 // why there is a non-obvious test down here.
 648                 //
 649                 public bool IsTopLevel {
 650                         get { return (Parent != null && Parent.Parent == null); }
 651                 }
 652
 653                 public virtual void CloseType ()
 654                 {
 655                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 656                                 try {
 657                                         TypeBuilder.CreateType ();
 658                                 } catch {
 659                                         //
 660                                         // The try/catch is needed because
 661                                         // nested enumerations fail to load when they
 662                                         // are defined.
 663                                         //
 664                                         // Even if this is the right order (enumerations
 665                                         // declared after types).
 666                                         //
 667                                         // Note that this still creates the type and
 668                                         // it is possible to save it
 669                                 }
 670                                 caching_flags |= Flags.CloseTypeCreated;
 671                         }
 672                 }
 673
 674                 protected virtual TypeAttributes TypeAttr {
 675                         get { return CodeGen.Module.DefaultCharSetType; }
 676                 }
 677
 678                 /// <remarks>
 679                 ///  Should be overriten by the appropriate declaration space
 680                 /// </remarks>
 681                 public abstract TypeBuilder DefineType ();
 682
 683                 /// <summary>
 684                 ///   Define all members, but don't apply any attributes or do anything which may
 685                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 686                 /// </summary>
 687                 public virtual bool DefineMembers (TypeContainer parent)
 688                 {
 689                         if (((ModFlags & Modifiers.NEW) != 0) && IsTopLevel) {
 690                                 Report.Error (1530, Location, "Keyword `new' is not allowed on namespace elements");
 691                                 return false;
 692                         }
 693                         return true;
 694                 }
 695
 696                 public override string GetSignatureForError ()
 697                 {
 698                         // Parent.GetSignatureForError
 699                         return Name;
 700                 }
 701
 702                 //
 703                 // Whether this is an `unsafe context'
 704                 //
 705                 public bool UnsafeContext {
 706                         get {
 707                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 708                                         return true;
 709                                 if (Parent != null)
 710                                         return Parent.UnsafeContext;
 711                                 return false;
 712                         }
 713                 }
 714
 715                 EmitContext type_resolve_ec;
 716                 protected EmitContext TypeResolveEmitContext {
 717                         get {
 718                                 if (type_resolve_ec == null) {
 719                                         // FIXME: I think this should really be one of:
 720                                         //
 721                                         // a. type_resolve_ec = Parent.EmitContext;
 722                                         // b. type_resolve_ec = new EmitContext (Parent, Parent, loc, null, null, ModFlags, false);
 723                                         //
 724                                         // However, if Parent == RootContext.Tree.Types, its NamespaceEntry will be null.
 725                                         //
 726                                         type_resolve_ec = new EmitContext (Parent, this, Location.Null, null, null, ModFlags, false);
 727                                 }
 728                                 return type_resolve_ec;
 729                         }
 730                 }
 731
 732                 // <summary>
 733                 //    Resolves the expression `e' for a type, and will recursively define
 734                 //    types.  This should only be used for resolving base types.
 735                 // </summary>
 736                 public TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
 737                 {
 738                         TypeResolveEmitContext.loc = loc;
 739                         TypeResolveEmitContext.ContainerType = TypeBuilder;
 740
 741                         return e.ResolveAsTypeTerminal (TypeResolveEmitContext, silent);
 742                 }
 743
 744                 public bool CheckAccessLevel (Type check_type)
 745                 {
 746                         if (check_type == TypeBuilder)
 747                                 return true;
 748
 749                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 750
 751                         //
 752                         // Broken Microsoft runtime, return public for arrays, no matter what
 753                         // the accessibility is for their underlying class, and they return
 754                         // NonPublic visibility for pointers
 755                         //
 756                         if (check_type.IsArray || check_type.IsPointer)
 757                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 758
 759                         if (TypeBuilder == null)
 760                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 761                                 //        However, this is invoked again later -- so safe to return true.
 762                                 //        May also be null when resolving top-level attributes.
 763                                 return true;
 764
 765                         switch (check_attr){
 766                         case TypeAttributes.Public:
 767                                 return true;
 768
 769                         case TypeAttributes.NotPublic:
 770                                 //
 771                                 // This test should probably use the declaringtype.
 772                                 //
 773                                 return check_type.Assembly == TypeBuilder.Assembly;
 774
 775                         case TypeAttributes.NestedPublic:
 776                                 return true;
 777
 778                         case TypeAttributes.NestedPrivate:
 779                                 return NestedAccessible (check_type);
 780
 781                         case TypeAttributes.NestedFamily:
 782                                 return FamilyAccessible (check_type);
 783
 784                         case TypeAttributes.NestedFamANDAssem:
 785                                 return (check_type.Assembly == TypeBuilder.Assembly) &&
 786                                         FamilyAccessible (check_type);
 787
 788                         case TypeAttributes.NestedFamORAssem:
 789                                 return (check_type.Assembly == TypeBuilder.Assembly) ||
 790                                         FamilyAccessible (check_type);
 791
 792                         case TypeAttributes.NestedAssembly:
 793                                 return check_type.Assembly == TypeBuilder.Assembly;
 794                         }
 795
 796                         Console.WriteLine ("HERE: " + check_attr);
 797                         return false;
 798
 799                 }
 800
 801                 protected bool NestedAccessible (Type check_type)
 802                 {
 803                         Type declaring = check_type.DeclaringType;
 804                         return TypeBuilder == declaring ||
 805                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 806                 }
 807
 808                 protected bool FamilyAccessible (Type check_type)
 809                 {
 810                         Type declaring = check_type.DeclaringType;
 811                         return TypeManager.IsNestedFamilyAccessible (TypeBuilder, declaring);
 812                 }
 813
 814                 // Access level of a type.
 815                 const int X = 1;
 816                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 817                                             // Public    Assembly   Protected
 818                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 819                         Public              = (X << 0) | (X << 1) | (X << 2),
 820                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 821                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 822                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 823                 }
 824
 825                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 826                 {
 827                         if ((flags & Modifiers.INTERNAL) != 0) {
 828
 829                                 if ((flags & Modifiers.PROTECTED) != 0)
 830                                         return AccessLevel.ProtectedOrInternal;
 831                                 else
 832                                         return AccessLevel.Internal;
 833
 834                         } else if ((flags & Modifiers.PROTECTED) != 0)
 835                                 return AccessLevel.Protected;
 836
 837                         else if ((flags & Modifiers.PRIVATE) != 0)
 838                                 return AccessLevel.Private;
 839
 840                         else
 841                                 return AccessLevel.Public;
 842                 }
 843
 844                 // What is the effective access level of this?
 845                 // TODO: Cache this?
 846                 AccessLevel EffectiveAccessLevel {
 847                         get {
 848                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 849                                 if (!IsTopLevel && (Parent != null))
 850                                         return myAccess & Parent.EffectiveAccessLevel;
 851                                 else
 852                                         return myAccess;
 853                         }
 854                 }
 855
 856                 // Return the access level for type `t'
 857                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 858                 {
 859                         if (t.IsPublic)
 860                                 return AccessLevel.Public;
 861                         if (t.IsNestedPrivate)
 862                                 return AccessLevel.Private;
 863                         if (t.IsNotPublic)
 864                                 return AccessLevel.Internal;
 865
 866                         // By now, it must be nested
 867                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
 868
 869                         if (t.IsNestedPublic)
 870                                 return parentLevel;
 871                         if (t.IsNestedAssembly)
 872                                 return parentLevel & AccessLevel.Internal;
 873                         if (t.IsNestedFamily)
 874                                 return parentLevel & AccessLevel.Protected;
 875                         if (t.IsNestedFamORAssem)
 876                                 return parentLevel & AccessLevel.ProtectedOrInternal;
 877                         if (t.IsNestedFamANDAssem)
 878                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 879
 880                         // nested private is taken care of
 881
 882                         throw new Exception ("I give up, what are you?");
 883                 }
 884
 885                 //
 886                 // This answers `is the type P, as accessible as a member M which has the
 887                 // accessability @flags which is declared as a nested member of the type T, this declspace'
 888                 //
 889                 public bool AsAccessible (Type p, int flags)
 890                 {
 891                         //
 892                         // 1) if M is private, its accessability is the same as this declspace.
 893                         // we already know that P is accessible to T before this method, so we
 894                         // may return true.
 895                         //
 896
 897                         if ((flags & Modifiers.PRIVATE) != 0)
 898                                 return true;
 899
 900                         while (p.IsArray || p.IsPointer || p.IsByRef)
 901                                 p = TypeManager.GetElementType (p);
 902
 903                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
 904                         AccessLevel mAccess = this.EffectiveAccessLevel &
 905                                 GetAccessLevelFromModifiers (flags);
 906
 907                         // for every place from which we can access M, we must
 908                         // be able to access P as well. So, we want
 909                         // For every bit in M and P, M_i -> P_1 == true
 910                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
 911
 912                         return ~ (~ mAccess | pAccess) == 0;
 913                 }
 914
 915                 //
 916                 // Return the nested type with name @name.  Ensures that the nested type
 917                 // is defined if necessary.  Do _not_ use this when you have a MemberCache handy.
 918                 //
 919                 public virtual Type FindNestedType (string name)
 920                 {
 921                         return null;
 922                 }
 923
 924                 private Type LookupNestedTypeInHierarchy (string name)
 925                 {
 926                         // if the member cache has been created, lets use it.
 927                         // the member cache is MUCH faster.
 928                         if (MemberCache != null)
 929                                 return MemberCache.FindNestedType (name);
 930
 931                         // no member cache. Do it the hard way -- reflection
 932                         Type t = null;
 933                         for (Type current_type = TypeBuilder;
 934                              current_type != null && current_type != TypeManager.object_type;
 935                              current_type = current_type.BaseType) {
 936                                 if (current_type is TypeBuilder) {
 937                                         DeclSpace decl = this;
 938                                         if (current_type != TypeBuilder)
 939                                                 decl = TypeManager.LookupDeclSpace (current_type);
 940                                         t = decl.FindNestedType (name);
 941                                 } else {
 942                                         t = TypeManager.GetNestedType (current_type, name);
 943                                 }
 944
 945                                 if (t != null && CheckAccessLevel (t))
 946                                         return t;
 947                         }
 948
 949                         return null;
 950                 }
 951
 952                 //
 953                 // Public function used to locate types.
 954                 //
 955                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
 956                 //
 957                 // Returns: Type or null if they type can not be found.
 958                 //
 959                 public FullNamedExpression LookupType (string name, Location loc, bool ignore_cs0104)
 960                 {
 961                         if (this is PartialContainer)
 962                                 throw new InternalErrorException ("Should not get here");
 963
 964                         if (Cache.Contains (name))
 965                                 return (FullNamedExpression) Cache [name];
 966
 967                         FullNamedExpression e;
 968                         Type t = LookupNestedTypeInHierarchy (name);
 969                         if (t != null)
 970                                 e = new TypeExpression (t, Location.Null);
 971                         else if (Parent != null && Parent != RootContext.Tree.Types)
 972                                 e = Parent.LookupType (name, loc, ignore_cs0104);
 973                         else
 974                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
 975
 976                         Cache [name] = e;
 977                         return e;
 978                 }
 979
 980                 /// <remarks>
 981                 ///   This function is broken and not what you're looking for.  It should only
 982                 ///   be used while the type is still being created since it doesn't use the cache
 983                 ///   and relies on the filter doing the member name check.
 984                 /// </remarks>
 985                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
 986                                                         MemberFilter filter, object criteria);
 987
 988                 /// <remarks>
 989                 ///   If we have a MemberCache, return it.  This property may return null if the
 990                 ///   class doesn't have a member cache or while it's still being created.
 991                 /// </remarks>
 992                 public abstract MemberCache MemberCache {
 993                         get;
 994                 }
 995
 996                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
 997                 {
 998                         if (a.Type == TypeManager.required_attr_type) {
 999                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1000                                 return;
1001                         }
1002                         TypeBuilder.SetCustomAttribute (cb);
1003                 }
1004
1005                 /// <summary>
1006                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
1007                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
1008                 /// </summary>
1009                 public bool GetClsCompliantAttributeValue ()
1010                 {
1011                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
1012                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
1013
1014                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
1015
1016                         if (OptAttributes != null) {
1017                                 Attribute cls_attribute = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, ec);
1018                                 if (cls_attribute != null) {
1019                                         caching_flags |= Flags.HasClsCompliantAttribute;
1020                                         if (cls_attribute.GetClsCompliantAttributeValue (ec)) {
1021                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1022                                                 return true;
1023                                         }
1024                                         return false;
1025                                 }
1026                         }
1027
1028                         if (Parent == null) {
1029                                 if (CodeGen.Assembly.IsClsCompliant) {
1030                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
1031                                         return true;
1032                                 }
1033                                 return false;
1034                         }
1035
1036                         if (Parent.GetClsCompliantAttributeValue ()) {
1037                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1038                                 return true;
1039                         }
1040                         return false;
1041                 }
1042
1043                 public override string[] ValidAttributeTargets {
1044                         get { return attribute_targets; }
1045                 }
1046
1047                 protected override bool VerifyClsCompliance (DeclSpace ds)
1048                 {
1049                         if (!base.VerifyClsCompliance (ds)) {
1050                                 return false;
1051                         }
1052
1053                         IDictionary cache = TypeManager.AllClsTopLevelTypes;
1054                         string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1055                         if (!cache.Contains (lcase)) {
1056                                 cache.Add (lcase, this);
1057                                 return true;
1058                         }
1059
1060                         object val = cache [lcase];
1061                         if (val == null) {
1062                                 Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
1063                                 if (t == null)
1064                                         return true;
1065                                 Report.SymbolRelatedToPreviousError (t);
1066                         }
1067                         else {
1068                                 if (val is PartialContainer)
1069                                         return true;
1070
1071                                 Report.SymbolRelatedToPreviousError ((DeclSpace)val);
1072                         }
1073                         Report.Error (3005, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1074                         return true;
1075                 }
1076         }
1077
1078         /// <summary>
1079         ///   This is a readonly list of MemberInfo's.
1080         /// </summary>
1081         public class MemberList : IList {
1082                 public readonly IList List;
1083                 int count;
1084
1085                 /// <summary>
1086                 ///   Create a new MemberList from the given IList.
1087                 /// </summary>
1088                 public MemberList (IList list)
1089                 {
1090                         if (list != null)
1091                                 this.List = list;
1092                         else
1093                                 this.List = new ArrayList ();
1094                         count = List.Count;
1095                 }
1096
1097                 /// <summary>
1098                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1099                 /// </summary>
1100                 public MemberList (IList first, IList second)
1101                 {
1102                         ArrayList list = new ArrayList ();
1103                         list.AddRange (first);
1104                         list.AddRange (second);
1105                         count = list.Count;
1106                         List = list;
1107                 }
1108
1109                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1110
1111                 /// <summary>
1112                 ///   Cast the MemberList into a MemberInfo[] array.
1113                 /// </summary>
1114                 /// <remarks>
1115                 ///   This is an expensive operation, only use it if it's really necessary.
1116                 /// </remarks>
1117                 public static explicit operator MemberInfo [] (MemberList list)
1118                 {
1119                         Timer.StartTimer (TimerType.MiscTimer);
1120                         MemberInfo [] result = new MemberInfo [list.Count];
1121                         list.CopyTo (result, 0);
1122                         Timer.StopTimer (TimerType.MiscTimer);
1123                         return result;
1124                 }
1125
1126                 // ICollection
1127
1128                 public int Count {
1129                         get {
1130                                 return count;
1131                         }
1132                 }
1133
1134                 public bool IsSynchronized {
1135                         get {
1136                                 return List.IsSynchronized;
1137                         }
1138                 }
1139
1140                 public object SyncRoot {
1141                         get {
1142                                 return List.SyncRoot;
1143                         }
1144                 }
1145
1146                 public void CopyTo (Array array, int index)
1147                 {
1148                         List.CopyTo (array, index);
1149                 }
1150
1151                 // IEnumerable
1152
1153                 public IEnumerator GetEnumerator ()
1154                 {
1155                         return List.GetEnumerator ();
1156                 }
1157
1158                 // IList
1159
1160                 public bool IsFixedSize {
1161                         get {
1162                                 return true;
1163                         }
1164                 }
1165
1166                 public bool IsReadOnly {
1167                         get {
1168                                 return true;
1169                         }
1170                 }
1171
1172                 object IList.this [int index] {
1173                         get {
1174                                 return List [index];
1175                         }
1176
1177                         set {
1178                                 throw new NotSupportedException ();
1179                         }
1180                 }
1181
1182                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1183                 public MemberInfo this [int index] {
1184                         get {
1185                                 return (MemberInfo) List [index];
1186                         }
1187                 }
1188
1189                 public int Add (object value)
1190                 {
1191                         throw new NotSupportedException ();
1192                 }
1193
1194                 public void Clear ()
1195                 {
1196                         throw new NotSupportedException ();
1197                 }
1198
1199                 public bool Contains (object value)
1200                 {
1201                         return List.Contains (value);
1202                 }
1203
1204                 public int IndexOf (object value)
1205                 {
1206                         return List.IndexOf (value);
1207                 }
1208
1209                 public void Insert (int index, object value)
1210                 {
1211                         throw new NotSupportedException ();
1212                 }
1213
1214                 public void Remove (object value)
1215                 {
1216                         throw new NotSupportedException ();
1217                 }
1218
1219                 public void RemoveAt (int index)
1220                 {
1221                         throw new NotSupportedException ();
1222                 }
1223         }
1224
1225         /// <summary>
1226         ///   This interface is used to get all members of a class when creating the
1227         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1228         ///   want to support the member cache and by TypeHandle to get caching of
1229         ///   non-dynamic types.
1230         /// </summary>
1231         public interface IMemberContainer {
1232                 /// <summary>
1233                 ///   The name of the IMemberContainer.  This is only used for
1234                 ///   debugging purposes.
1235                 /// </summary>
1236                 string Name {
1237                         get;
1238                 }
1239
1240                 /// <summary>
1241                 ///   The type of this IMemberContainer.
1242                 /// </summary>
1243                 Type Type {
1244                         get;
1245                 }
1246
1247                 /// <summary>
1248                 ///   Returns the IMemberContainer of the base class or null if this
1249                 ///   is an interface or TypeManger.object_type.
1250                 ///   This is used when creating the member cache for a class to get all
1251                 ///   members from the base class.
1252                 /// </summary>
1253                 MemberCache BaseCache {
1254                         get;
1255                 }
1256
1257                 /// <summary>
1258                 ///   Whether this is an interface.
1259                 /// </summary>
1260                 bool IsInterface {
1261                         get;
1262                 }
1263
1264                 /// <summary>
1265                 ///   Returns all members of this class with the corresponding MemberTypes
1266                 ///   and BindingFlags.
1267                 /// </summary>
1268                 /// <remarks>
1269                 ///   When implementing this method, make sure not to return any inherited
1270                 ///   members and check the MemberTypes and BindingFlags properly.
1271                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1272                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1273                 ///   MemberInfo class, but the cache needs this information.  That's why
1274                 ///   this method is called multiple times with different BindingFlags.
1275                 /// </remarks>
1276                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1277
1278                 /// <summary>
1279                 ///   Return the container's member cache.
1280                 /// </summary>
1281                 MemberCache MemberCache {
1282                         get;
1283                 }
1284         }
1285
1286         /// <summary>
1287         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1288         ///   member lookups.  It has a member name based hash table; it maps each member
1289         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1290         ///   and the BindingFlags that were initially used to get it.  The cache contains
1291         ///   all members of the current class and all inherited members.  If this cache is
1292         ///   for an interface types, it also contains all inherited members.
1293         ///
1294         ///   There are two ways to get a MemberCache:
1295         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1296         ///     use the DeclSpace.MemberCache property.
1297         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1298         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1299         /// </summary>
1300         public class MemberCache {
1301                 public readonly IMemberContainer Container;
1302                 protected Hashtable member_hash;
1303                 protected Hashtable method_hash;
1304
1305                 /// <summary>
1306                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1307                 /// </summary>
1308                 public MemberCache (IMemberContainer container)
1309                 {
1310                         this.Container = container;
1311
1312                         Timer.IncrementCounter (CounterType.MemberCache);
1313                         Timer.StartTimer (TimerType.CacheInit);
1314
1315                         // If we have a base class (we have a base class unless we're
1316                         // TypeManager.object_type), we deep-copy its MemberCache here.
1317                         if (Container.BaseCache != null)
1318                                 member_hash = SetupCache (Container.BaseCache);
1319                         else
1320                                 member_hash = new Hashtable ();
1321
1322                         // If this is neither a dynamic type nor an interface, create a special
1323                         // method cache with all declared and inherited methods.
1324                         Type type = container.Type;
1325                         if (!(type is TypeBuilder) && !type.IsInterface &&
1326                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1327                                 method_hash = new Hashtable ();
1328                                 AddMethods (type);
1329                         }
1330
1331                         // Add all members from the current class.
1332                         AddMembers (Container);
1333
1334                         Timer.StopTimer (TimerType.CacheInit);
1335                 }
1336
1337                 public MemberCache (Type[] ifaces)
1338                 {
1339                         //
1340                         // The members of this cache all belong to other caches.
1341                         // So, 'Container' will not be used.
1342                         //
1343                         this.Container = null;
1344
1345                         member_hash = new Hashtable ();
1346                         if (ifaces == null)
1347                                 return;
1348
1349                         foreach (Type itype in ifaces)
1350                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1351                 }
1352
1353                 /// <summary>
1354                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1355                 /// </summary>
1356                 Hashtable SetupCache (MemberCache base_class)
1357                 {
1358                         Hashtable hash = new Hashtable ();
1359
1360                         if (base_class == null)
1361                                 return hash;
1362
1363                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1364                         while (it.MoveNext ()) {
1365                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1366                          }
1367
1368                         return hash;
1369                 }
1370
1371                 /// <summary>
1372                 ///   Add the contents of `cache' to the member_hash.
1373                 /// </summary>
1374                 void AddCacheContents (MemberCache cache)
1375                 {
1376                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1377                         while (it.MoveNext ()) {
1378                                 ArrayList list = (ArrayList) member_hash [it.Key];
1379                                 if (list == null)
1380                                         member_hash [it.Key] = list = new ArrayList ();
1381
1382                                 ArrayList entries = (ArrayList) it.Value;
1383                                 for (int i = entries.Count-1; i >= 0; i--) {
1384                                         CacheEntry entry = (CacheEntry) entries [i];
1385
1386                                         if (entry.Container != cache.Container)
1387                                                 break;
1388                                         list.Add (entry);
1389                                 }
1390                         }
1391                 }
1392
1393                 /// <summary>
1394                 ///   Add all members from class `container' to the cache.
1395                 /// </summary>
1396                 void AddMembers (IMemberContainer container)
1397                 {
1398                         // We need to call AddMembers() with a single member type at a time
1399                         // to get the member type part of CacheEntry.EntryType right.
1400                         if (!container.IsInterface) {
1401                                 AddMembers (MemberTypes.Constructor, container);
1402                                 AddMembers (MemberTypes.Field, container);
1403                         }
1404                         AddMembers (MemberTypes.Method, container);
1405                         AddMembers (MemberTypes.Property, container);
1406                         AddMembers (MemberTypes.Event, container);
1407                         // Nested types are returned by both Static and Instance searches.
1408                         AddMembers (MemberTypes.NestedType,
1409                                     BindingFlags.Static | BindingFlags.Public, container);
1410                         AddMembers (MemberTypes.NestedType,
1411                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1412                 }
1413
1414                 void AddMembers (MemberTypes mt, IMemberContainer container)
1415                 {
1416                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1417                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1418                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1419                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1420                 }
1421
1422                 /// <summary>
1423                 ///   Add all members from class `container' with the requested MemberTypes and
1424                 ///   BindingFlags to the cache.  This method is called multiple times with different
1425                 ///   MemberTypes and BindingFlags.
1426                 /// </summary>
1427                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1428                 {
1429                         MemberList members = container.GetMembers (mt, bf);
1430
1431                         foreach (MemberInfo member in members) {
1432                                 string name = member.Name;
1433
1434                                 // We use a name-based hash table of ArrayList's.
1435                                 ArrayList list = (ArrayList) member_hash [name];
1436                                 if (list == null) {
1437                                         list = new ArrayList ();
1438                                         member_hash.Add (name, list);
1439                                 }
1440
1441                                 // When this method is called for the current class, the list will
1442                                 // already contain all inherited members from our base classes.
1443                                 // We cannot add new members in front of the list since this'd be an
1444                                 // expensive operation, that's why the list is sorted in reverse order
1445                                 // (ie. members from the current class are coming last).
1446                                 list.Add (new CacheEntry (container, member, mt, bf));
1447                         }
1448                 }
1449
1450                 /// <summary>
1451                 ///   Add all declared and inherited methods from class `type' to the method cache.
1452                 /// </summary>
1453                 void AddMethods (Type type)
1454                 {
1455                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1456                                     BindingFlags.FlattenHierarchy, type);
1457                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1458                                     BindingFlags.FlattenHierarchy, type);
1459                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1460                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1461                 }
1462
1463                 static ArrayList overrides = new ArrayList ();
1464
1465                 void AddMethods (BindingFlags bf, Type type)
1466                 {
1467                         MethodBase [] members = type.GetMethods (bf);
1468
1469                         Array.Reverse (members);
1470
1471                         foreach (MethodBase member in members) {
1472                                 string name = member.Name;
1473
1474                                 // We use a name-based hash table of ArrayList's.
1475                                 ArrayList list = (ArrayList) method_hash [name];
1476                                 if (list == null) {
1477                                         list = new ArrayList ();
1478                                         method_hash.Add (name, list);
1479                                 }
1480
1481                                 MethodInfo curr = (MethodInfo) member;
1482                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1483                                         MethodInfo base_method = curr.GetBaseDefinition ();
1484
1485                                         if (base_method == curr)
1486                                                 // Not every virtual function needs to have a NewSlot flag.
1487                                                 break;
1488
1489                                         overrides.Add (curr);
1490                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1491                                         curr = base_method;
1492                                 }
1493
1494                                 if (overrides.Count > 0) {
1495                                         for (int i = 0; i < overrides.Count; ++i)
1496                                                 TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
1497                                         overrides.Clear ();
1498                                 }
1499
1500                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1501                                 // sorted so we need to do this check for every member.
1502                                 BindingFlags new_bf = bf;
1503                                 if (member.DeclaringType == type)
1504                                         new_bf |= BindingFlags.DeclaredOnly;
1505
1506                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1507                         }
1508                 }
1509
1510                 /// <summary>
1511                 ///   Compute and return a appropriate `EntryType' magic number for the given
1512                 ///   MemberTypes and BindingFlags.
1513                 /// </summary>
1514                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1515                 {
1516                         EntryType type = EntryType.None;
1517
1518                         if ((mt & MemberTypes.Constructor) != 0)
1519                                 type |= EntryType.Constructor;
1520                         if ((mt & MemberTypes.Event) != 0)
1521                                 type |= EntryType.Event;
1522                         if ((mt & MemberTypes.Field) != 0)
1523                                 type |= EntryType.Field;
1524                         if ((mt & MemberTypes.Method) != 0)
1525                                 type |= EntryType.Method;
1526                         if ((mt & MemberTypes.Property) != 0)
1527                                 type |= EntryType.Property;
1528                         // Nested types are returned by static and instance searches.
1529                         if ((mt & MemberTypes.NestedType) != 0)
1530                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1531
1532                         if ((bf & BindingFlags.Instance) != 0)
1533                                 type |= EntryType.Instance;
1534                         if ((bf & BindingFlags.Static) != 0)
1535                                 type |= EntryType.Static;
1536                         if ((bf & BindingFlags.Public) != 0)
1537                                 type |= EntryType.Public;
1538                         if ((bf & BindingFlags.NonPublic) != 0)
1539                                 type |= EntryType.NonPublic;
1540                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1541                                 type |= EntryType.Declared;
1542
1543                         return type;
1544                 }
1545
1546                 /// <summary>
1547                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1548                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1549                 ///   single member types.
1550                 /// </summary>
1551                 public static bool IsSingleMemberType (MemberTypes mt)
1552                 {
1553                         switch (mt) {
1554                         case MemberTypes.Constructor:
1555                         case MemberTypes.Event:
1556                         case MemberTypes.Field:
1557                         case MemberTypes.Method:
1558                         case MemberTypes.Property:
1559                         case MemberTypes.NestedType:
1560                                 return true;
1561
1562                         default:
1563                                 return false;
1564                         }
1565                 }
1566
1567                 /// <summary>
1568                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1569                 ///   number to speed up the searching process.
1570                 /// </summary>
1571                 [Flags]
1572                 protected enum EntryType {
1573                         None            = 0x000,
1574
1575                         Instance        = 0x001,
1576                         Static          = 0x002,
1577                         MaskStatic      = Instance|Static,
1578
1579                         Public          = 0x004,
1580                         NonPublic       = 0x008,
1581                         MaskProtection  = Public|NonPublic,
1582
1583                         Declared        = 0x010,
1584
1585                         Constructor     = 0x020,
1586                         Event           = 0x040,
1587                         Field           = 0x080,
1588                         Method          = 0x100,
1589                         Property        = 0x200,
1590                         NestedType      = 0x400,
1591
1592                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1593                 }
1594
1595                 protected class CacheEntry {
1596                         public readonly IMemberContainer Container;
1597                         public readonly EntryType EntryType;
1598                         public readonly MemberInfo Member;
1599
1600                         public CacheEntry (IMemberContainer container, MemberInfo member,
1601                                            MemberTypes mt, BindingFlags bf)
1602                         {
1603                                 this.Container = container;
1604                                 this.Member = member;
1605                                 this.EntryType = GetEntryType (mt, bf);
1606                         }
1607
1608                         public override string ToString ()
1609                         {
1610                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1611                                                       EntryType, Member);
1612                         }
1613                 }
1614
1615                 /// <summary>
1616                 ///   This is called each time we're walking up one level in the class hierarchy
1617                 ///   and checks whether we can abort the search since we've already found what
1618                 ///   we were looking for.
1619                 /// </summary>
1620                 protected bool DoneSearching (ArrayList list)
1621                 {
1622                         //
1623                         // We've found exactly one member in the current class and it's not
1624                         // a method or constructor.
1625                         //
1626                         if (list.Count == 1 && !(list [0] is MethodBase))
1627                                 return true;
1628
1629                         //
1630                         // Multiple properties: we query those just to find out the indexer
1631                         // name
1632                         //
1633                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1634                                 return true;
1635
1636                         return false;
1637                 }
1638
1639                 /// <summary>
1640                 ///   Looks up members with name `name'.  If you provide an optional
1641                 ///   filter function, it'll only be called with members matching the
1642                 ///   requested member name.
1643                 ///
1644                 ///   This method will try to use the cache to do the lookup if possible.
1645                 ///
1646                 ///   Unlike other FindMembers implementations, this method will always
1647                 ///   check all inherited members - even when called on an interface type.
1648                 ///
1649                 ///   If you know that you're only looking for methods, you should use
1650                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1651                 ///   When doing a method-only search, it'll try to use a special method
1652                 ///   cache (unless it's a dynamic type or an interface) and the returned
1653                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1654                 ///   The lookup process will automatically restart itself in method-only
1655                 ///   search mode if it discovers that it's about to return methods.
1656                 /// </summary>
1657                 ArrayList global = new ArrayList ();
1658                 bool using_global = false;
1659
1660                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1661
1662                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1663                                                   MemberFilter filter, object criteria)
1664                 {
1665                         if (using_global)
1666                                 throw new Exception ();
1667
1668                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1669                         bool method_search = mt == MemberTypes.Method;
1670                         // If we have a method cache and we aren't already doing a method-only search,
1671                         // then we restart a method search if the first match is a method.
1672                         bool do_method_search = !method_search && (method_hash != null);
1673
1674                         ArrayList applicable;
1675
1676                         // If this is a method-only search, we try to use the method cache if
1677                         // possible; a lookup in the method cache will return a MemberInfo with
1678                         // the correct ReflectedType for inherited methods.
1679
1680                         if (method_search && (method_hash != null))
1681                                 applicable = (ArrayList) method_hash [name];
1682                         else
1683                                 applicable = (ArrayList) member_hash [name];
1684
1685                         if (applicable == null)
1686                                 return emptyMemberInfo;
1687
1688                         //
1689                         // 32  slots gives 53 rss/54 size
1690                         // 2/4 slots gives 55 rss
1691                         //
1692                         // Strange: from 25,000 calls, only 1,800
1693                         // are above 2.  Why does this impact it?
1694                         //
1695                         global.Clear ();
1696                         using_global = true;
1697
1698                         Timer.StartTimer (TimerType.CachedLookup);
1699
1700                         EntryType type = GetEntryType (mt, bf);
1701
1702                         IMemberContainer current = Container;
1703
1704
1705                         // `applicable' is a list of all members with the given member name `name'
1706                         // in the current class and all its base classes.  The list is sorted in
1707                         // reverse order due to the way how the cache is initialy created (to speed
1708                         // things up, we're doing a deep-copy of our base).
1709
1710                         for (int i = applicable.Count-1; i >= 0; i--) {
1711                                 CacheEntry entry = (CacheEntry) applicable [i];
1712
1713                                 // This happens each time we're walking one level up in the class
1714                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
1715                                 // the first time this happens (this may already happen in the first
1716                                 // iteration of this loop if there are no members with the name we're
1717                                 // looking for in the current class).
1718                                 if (entry.Container != current) {
1719                                         if (declared_only || DoneSearching (global))
1720                                                 break;
1721
1722                                         current = entry.Container;
1723                                 }
1724
1725                                 // Is the member of the correct type ?
1726                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
1727                                         continue;
1728
1729                                 // Is the member static/non-static ?
1730                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
1731                                         continue;
1732
1733                                 // Apply the filter to it.
1734                                 if (filter (entry.Member, criteria)) {
1735                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
1736                                                 do_method_search = false;
1737                                         global.Add (entry.Member);
1738                                 }
1739                         }
1740
1741                         Timer.StopTimer (TimerType.CachedLookup);
1742
1743                         // If we have a method cache and we aren't already doing a method-only
1744                         // search, we restart in method-only search mode if the first match is
1745                         // a method.  This ensures that we return a MemberInfo with the correct
1746                         // ReflectedType for inherited methods.
1747                         if (do_method_search && (global.Count > 0)){
1748                                 using_global = false;
1749
1750                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
1751                         }
1752
1753                         using_global = false;
1754                         MemberInfo [] copy = new MemberInfo [global.Count];
1755                         global.CopyTo (copy);
1756                         return copy;
1757                 }
1758
1759                 // find the nested type @name in @this.
1760                 public Type FindNestedType (string name)
1761                 {
1762                         ArrayList applicable = (ArrayList) member_hash [name];
1763                         if (applicable == null)
1764                                 return null;
1765
1766                         for (int i = applicable.Count-1; i >= 0; i--) {
1767                                 CacheEntry entry = (CacheEntry) applicable [i];
1768                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
1769                                         return (Type) entry.Member;
1770                         }
1771
1772                         return null;
1773                 }
1774
1775                 //
1776                 // This finds the method or property for us to override. invocationType is the type where
1777                 // the override is going to be declared, name is the name of the method/property, and
1778                 // paramTypes is the parameters, if any to the method or property
1779                 //
1780                 // Because the MemberCache holds members from this class and all the base classes,
1781                 // we can avoid tons of reflection stuff.
1782                 //
1783                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
1784                 {
1785                         ArrayList applicable;
1786                         if (method_hash != null && !is_property)
1787                                 applicable = (ArrayList) method_hash [name];
1788                         else
1789                                 applicable = (ArrayList) member_hash [name];
1790
1791                         if (applicable == null)
1792                                 return null;
1793                         //
1794                         // Walk the chain of methods, starting from the top.
1795                         //
1796                         for (int i = applicable.Count - 1; i >= 0; i--) {
1797                                 CacheEntry entry = (CacheEntry) applicable [i];
1798
1799                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
1800                                         continue;
1801
1802                                 PropertyInfo pi = null;
1803                                 MethodInfo mi = null;
1804                                 FieldInfo fi = null;
1805                                 Type [] cmpAttrs = null;
1806
1807                                 if (is_property) {
1808                                         if ((entry.EntryType & EntryType.Field) != 0) {
1809                                                 fi = (FieldInfo)entry.Member;
1810
1811                                                 // TODO: For this case we ignore member type
1812                                                 //fb = TypeManager.GetField (fi);
1813                                                 //cmpAttrs = new Type[] { fb.MemberType };
1814                                         } else {
1815                                                 pi = (PropertyInfo) entry.Member;
1816                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
1817                                         }
1818                                 } else {
1819                                         mi = (MethodInfo) entry.Member;
1820                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
1821                                 }
1822
1823                                 if (fi != null) {
1824                                         // TODO: Almost duplicate !
1825                                         // Check visibility
1826                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
1827                                                 case FieldAttributes.Private:
1828                                                         //
1829                                                         // A private method is Ok if we are a nested subtype.
1830                                                         // The spec actually is not very clear about this, see bug 52458.
1831                                                         //
1832                                                         if (invocationType != entry.Container.Type &
1833                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1834                                                                 continue;
1835
1836                                                         break;
1837                                                 case FieldAttributes.FamANDAssem:
1838                                                 case FieldAttributes.Assembly:
1839                                                         //
1840                                                         // Check for assembly methods
1841                                                         //
1842                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
1843                                                                 continue;
1844                                                         break;
1845                                         }
1846                                         return entry.Member;
1847                                 }
1848
1849                                 //
1850                                 // Check the arguments
1851                                 //
1852                                 if (cmpAttrs.Length != paramTypes.Length)
1853                                         continue;
1854
1855                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --)
1856                                         if (paramTypes [j] != cmpAttrs [j])
1857                                                 goto next;
1858
1859                                 //
1860                                 // get one of the methods because this has the visibility info.
1861                                 //
1862                                 if (is_property) {
1863                                         mi = pi.GetGetMethod (true);
1864                                         if (mi == null)
1865                                                 mi = pi.GetSetMethod (true);
1866                                 }
1867
1868                                 //
1869                                 // Check visibility
1870                                 //
1871                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
1872                                 case MethodAttributes.Private:
1873                                         //
1874                                         // A private method is Ok if we are a nested subtype.
1875                                         // The spec actually is not very clear about this, see bug 52458.
1876                                         //
1877                                         if (invocationType == entry.Container.Type ||
1878                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1879                                                 return entry.Member;
1880
1881                                         break;
1882                                 case MethodAttributes.FamANDAssem:
1883                                 case MethodAttributes.Assembly:
1884                                         //
1885                                         // Check for assembly methods
1886                                         //
1887                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
1888                                                 return entry.Member;
1889
1890                                         break;
1891                                 default:
1892                                         //
1893                                         // A protected method is ok, because we are overriding.
1894                                         // public is always ok.
1895                                         //
1896                                         return entry.Member;
1897                                 }
1898                         next:
1899                                 ;
1900                         }
1901
1902                         return null;
1903                 }
1904
1905                 /// <summary>
1906                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
1907                 /// We handle two cases. The first is for types without parameters (events, field, properties).
1908                 /// The second are methods, indexers and this is why ignore_complex_types is here.
1909                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
1910                 /// </summary>
1911                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
1912                 {
1913                         ArrayList applicable = null;
1914
1915                         if (method_hash != null)
1916                                 applicable = (ArrayList) method_hash [name];
1917
1918                         if (applicable != null) {
1919                                 for (int i = applicable.Count - 1; i >= 0; i--) {
1920                                         CacheEntry entry = (CacheEntry) applicable [i];
1921                                         if ((entry.EntryType & EntryType.Public) != 0)
1922                                                 return entry.Member;
1923                                 }
1924                         }
1925
1926                         if (member_hash == null)
1927                                 return null;
1928                         applicable = (ArrayList) member_hash [name];
1929
1930                         if (applicable != null) {
1931                                 for (int i = applicable.Count - 1; i >= 0; i--) {
1932                                         CacheEntry entry = (CacheEntry) applicable [i];
1933                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
1934                                                 if (ignore_complex_types) {
1935                                                         if ((entry.EntryType & EntryType.Method) != 0)
1936                                                                 continue;
1937
1938                                                         // Does exist easier way how to detect indexer ?
1939                                                         if ((entry.EntryType & EntryType.Property) != 0) {
1940                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
1941                                                                 if (arg_types.Length > 0)
1942                                                                         continue;
1943                                                         }
1944                                                 }
1945                                                 return entry.Member;
1946                                         }
1947                                 }
1948                         }
1949                         return null;
1950                 }
1951
1952                 Hashtable locase_table;
1953
1954                 /// <summary>
1955                 /// Builds low-case table for CLS Compliance test
1956                 /// </summary>
1957                 public Hashtable GetPublicMembers ()
1958                 {
1959                         if (locase_table != null)
1960                                 return locase_table;
1961
1962                         locase_table = new Hashtable ();
1963                         foreach (DictionaryEntry entry in member_hash) {
1964                                 ArrayList members = (ArrayList)entry.Value;
1965                                 for (int ii = 0; ii < members.Count; ++ii) {
1966                                         CacheEntry member_entry = (CacheEntry) members [ii];
1967
1968                                         if ((member_entry.EntryType & EntryType.Public) == 0)
1969                                                 continue;
1970
1971                                         // TODO: Does anyone know easier way how to detect that member is internal ?
1972                                         switch (member_entry.EntryType & EntryType.MaskType) {
1973                                                 case EntryType.Constructor:
1974                                                         continue;
1975
1976                                                 case EntryType.Field:
1977                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
1978                                                                 continue;
1979                                                         break;
1980
1981                                                 case EntryType.Method:
1982                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
1983                                                                 continue;
1984                                                         break;
1985
1986                                                 case EntryType.Property:
1987                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
1988                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
1989                                                                 continue;
1990                                                         break;
1991
1992                                                 case EntryType.Event:
1993                                                         EventInfo ei = (EventInfo)member_entry.Member;
1994                                                         MethodInfo mi = ei.GetAddMethod ();
1995                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
1996                                                                 continue;
1997                                                         break;
1998                                         }
1999                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2000                                         locase_table [lcase] = member_entry.Member;
2001                                         break;
2002                                 }
2003                         }
2004                         return locase_table;
2005                 }
2006
2007                 public Hashtable Members {
2008                         get {
2009                                 return member_hash;
2010                         }
2011                 }
2012
2013                 /// <summary>
2014                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2015                 /// </summary>
2016                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2017                 {
2018                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2019
2020                         for (int i = 0; i < al.Count; ++i) {
2021                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2022
2023                                 // skip itself
2024                                 if (entry.Member == this_builder)
2025                                         continue;
2026
2027                                 if ((entry.EntryType & tested_type) != tested_type)
2028                                         continue;
2029
2030                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2031                                 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
2032                                         method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare));
2033
2034                                 if (result == AttributeTester.Result.Ok)
2035                                         continue;
2036
2037                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2038
2039                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2040                                 // However it is exactly what csc does.
2041                                 if (md != null && !md.IsClsCompliaceRequired (method.Parent))
2042                                         continue;
2043
2044                                 Report.SymbolRelatedToPreviousError (entry.Member);
2045                                 switch (result) {
2046                                         case AttributeTester.Result.RefOutArrayError:
2047                                                 Report.Error (3006, method.Location, "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2048                                                 continue;
2049                                         case AttributeTester.Result.ArrayArrayError:
2050                                                 Report.Error (3007, method.Location, "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant", method.GetSignatureForError ());
2051                                                 continue;
2052                                 }
2053
2054                                 throw new NotImplementedException (result.ToString ());
2055                         }
2056                 }
2057         }
2058 }