mcs/mcs/decl.cs

   1 //
   2 // decl.cs: Declaration base class for structs, classes, enums and interfaces.
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10 // (C) 2004 Novell, Inc
  11 //
  12 // TODO: Move the method verification stuff from the class.cs and interface.cs here
  13 //
  14
  15 using System;
  16 using System.Collections;
  17 using System.Globalization;
  18 using System.Reflection.Emit;
  19 using System.Reflection;
  20
  21 #if BOOTSTRAP_WITH_OLDLIB
  22 using XmlElement = System.Object;
  23 #else
  24 using System.Xml;
  25 #endif
  26
  27 namespace Mono.CSharp {
  28
  29         public class MemberName {
  30                 public readonly string Name;
  31                 public readonly MemberName Left;
  32
  33                 public static readonly MemberName Null = new MemberName ("");
  34
  35                 public MemberName (string name)
  36                 {
  37                         this.Name = name;
  38                 }
  39
  40                 public MemberName (MemberName left, string name)
  41                         : this (name)
  42                 {
  43                         this.Left = left;
  44                 }
  45
  46                 public MemberName (MemberName left, MemberName right)
  47                 {
  48                         Name = right.Name;
  49                         Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  50                 }
  51
  52                 static readonly char [] dot_array = { '.' };
  53
  54                 public static MemberName FromDotted (string name)
  55                 {
  56                         string [] elements = name.Split (dot_array);
  57                         int count = elements.Length;
  58                         int i = 0;
  59                         MemberName n = new MemberName (elements [i++]);
  60                         while (i < count)
  61                                 n = new MemberName (n, elements [i++]);
  62                         return n;
  63                 }
  64
  65                 public string GetName ()
  66                 {
  67                         return GetName (false);
  68                 }
  69
  70                 public string GetName (bool is_generic)
  71                 {
  72                         string name = is_generic ? Basename : Name;
  73                         if (Left != null)
  74                                 return Left.GetName (is_generic) + "." + name;
  75                         else
  76                                 return name;
  77                 }
  78
  79                 ///
  80                 /// This returns exclusively the name as seen on the source code
  81                 /// it is not the fully qualifed type after resolution
  82                 ///
  83                 public string GetPartialName ()
  84                 {
  85                         if (Left != null)
  86                                 return Left.GetPartialName () + "." + Name;
  87                         else
  88                                 return Name;
  89                 }
  90
  91                 public string GetTypeName ()
  92                 {
  93                         if (Left != null)
  94                                 return Left.GetTypeName () + "." + Name;
  95                         else
  96                                 return Name;
  97                 }
  98
  99                 public Expression GetTypeExpression (Location loc)
 100                 {
 101                         if (Left != null) {
 102                                 Expression lexpr = Left.GetTypeExpression (loc);
 103
 104                                 return new MemberAccess (lexpr, Name, loc);
 105                         } else {
 106                                 return new SimpleName (Name, loc);
 107                         }
 108                 }
 109
 110                 public MemberName Clone ()
 111                 {
 112                         if (Left != null)
 113                                 return new MemberName (Left.Clone (), Name);
 114                         else
 115                                 return new MemberName (Name);
 116                 }
 117
 118                 public string Basename {
 119                         get {
 120                                 return Name;
 121                         }
 122                 }
 123
 124                 public override string ToString ()
 125                 {
 126                         if (Left != null)
 127                                 return Left + "." + Name;
 128                         else
 129                                 return Name;
 130                 }
 131
 132                 public override bool Equals (object other)
 133                 {
 134                         return Equals (other as MemberName);
 135                 }
 136
 137                 public bool Equals (MemberName other)
 138                 {
 139                         if (this == other)
 140                                 return true;
 141                         if (other == null || Name != other.Name)
 142                                 return false;
 143 #if NET_2_0
 144                         if (TypeArguments == null)
 145                                 return other.TypeArguments == null;
 146
 147                         if (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count)
 148                                 return false;
 149 #endif
 150                         if (Left == null)
 151                                 return other.Left == null;
 152
 153                         return Left.Equals (other.Left);
 154                 }
 155
 156                 public override int GetHashCode ()
 157                 {
 158                         int hash = Name.GetHashCode ();
 159                         for (MemberName n = Left; n != null; n = n.Left)
 160                                 hash ^= n.Name.GetHashCode ();
 161
 162 #if NET_2_0
 163                         if (TypeArguments != null)
 164                                 hash ^= TypeArguments.Count << 5;
 165 #endif
 166
 167                         return hash & 0x7FFFFFFF;
 168                 }
 169         }
 170
 171         /// <summary>
 172         ///   Base representation for members.  This is used to keep track
 173         ///   of Name, Location and Modifier flags, and handling Attributes.
 174         /// </summary>
 175         public abstract class MemberCore : Attributable {
 176                 /// <summary>
 177                 ///   Public name
 178                 /// </summary>
 179
 180                 protected string cached_name;
 181                 public string Name {
 182                         get {
 183                                 if (cached_name == null)
 184                                         cached_name = MemberName.GetName (false);
 185                                 return cached_name;
 186                         }
 187                 }
 188
 189                 // Is not readonly because of IndexerName attribute
 190                 private MemberName member_name;
 191                 public MemberName MemberName {
 192                         get { return member_name; }
 193                 }
 194
 195                 /// <summary>
 196                 ///   Modifier flags that the user specified in the source code
 197                 /// </summary>
 198                 public int ModFlags;
 199
 200                 public /*readonly*/ TypeContainer Parent;
 201
 202                 /// <summary>
 203                 ///   Location where this declaration happens
 204                 /// </summary>
 205                 public readonly Location Location;
 206
 207                 /// <summary>
 208                 ///   XML documentation comment
 209                 /// </summary>
 210                 public string DocComment;
 211
 212                 /// <summary>
 213                 ///   Represents header string for documentation comment
 214                 ///   for each member types.
 215                 /// </summary>
 216                 public abstract string DocCommentHeader { get; }
 217
 218                 [Flags]
 219                 public enum Flags {
 220                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 221                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 222                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 223                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 224                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 225                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 226                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 227                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 228                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 229                         Excluded = 1 << 9,                                      // Method is conditional
 230                         TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
 231                         IsUsed = 1 << 11
 232                 }
 233
 234                 /// <summary>
 235                 ///   MemberCore flags at first detected then cached
 236                 /// </summary>
 237                 internal Flags caching_flags;
 238
 239                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs,
 240                                    Location loc)
 241                         : base (attrs)
 242                 {
 243                         if (parent is PartialContainer && !(this is PartialContainer))
 244                                 throw new InternalErrorException ("A PartialContainer cannot be the direct parent of a member");
 245
 246                         Parent = parent;
 247                         member_name = name;
 248                         Location = loc;
 249                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 250                 }
 251
 252                 protected virtual void SetMemberName (MemberName new_name)
 253                 {
 254                         member_name = new_name;
 255                         cached_name = null;
 256                 }
 257
 258                 /// <summary>
 259                 /// Tests presence of ObsoleteAttribute and report proper error
 260                 /// </summary>
 261                 protected void CheckUsageOfObsoleteAttribute (Type type)
 262                 {
 263                         if (type == null)
 264                                 return;
 265
 266                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
 267                         if (obsolete_attr == null)
 268                                 return;
 269
 270                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
 271                 }
 272
 273                 public abstract bool Define ();
 274
 275                 //
 276                 // Returns full member name for error message
 277                 //
 278                 public virtual string GetSignatureForError ()
 279                 {
 280                         return Name;
 281                 }
 282
 283                 /// <summary>
 284                 /// Use this method when MethodBuilder is null
 285                 /// </summary>
 286                 public virtual string GetSignatureForError (TypeContainer tc)
 287                 {
 288                         return Name;
 289                 }
 290
 291                 /// <summary>
 292                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 293                 /// </summary>
 294                 public virtual void Emit ()
 295                 {
 296                         // Hack with Parent == null is for EnumMember
 297                         if (Parent == null || (GetObsoleteAttribute (Parent) == null && Parent.GetObsoleteAttribute (Parent) == null))
 298                                 VerifyObsoleteAttribute ();
 299
 300                         if (!RootContext.VerifyClsCompliance)
 301                                 return;
 302
 303                         VerifyClsCompliance (Parent);
 304                 }
 305
 306                 public bool InUnsafe {
 307                         get {
 308                                 return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
 309                         }
 310                 }
 311
 312                 public virtual bool IsUsed {
 313                         get {
 314                                 return (caching_flags & Flags.IsUsed) != 0;
 315                         }
 316                 }
 317
 318                 public void SetMemberIsUsed ()
 319                 {
 320                         caching_flags |= Flags.IsUsed;
 321                 }
 322
 323                 //
 324                 // Whehter is it ok to use an unsafe pointer in this type container
 325                 //
 326                 public bool UnsafeOK (DeclSpace parent)
 327                 {
 328                         //
 329                         // First check if this MemberCore modifier flags has unsafe set
 330                         //
 331                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 332                                 return true;
 333
 334                         if (parent.UnsafeContext)
 335                                 return true;
 336
 337                         Expression.UnsafeError (Location);
 338                         return false;
 339                 }
 340
 341                 /// <summary>
 342                 /// Returns instance of ObsoleteAttribute for this MemberCore
 343                 /// </summary>
 344                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 345                 {
 346                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 347                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 348                                 return null;
 349                         }
 350
 351                         caching_flags &= ~Flags.Obsolete_Undetected;
 352
 353                         if (OptAttributes == null)
 354                                 return null;
 355
 356                         Attribute obsolete_attr = OptAttributes.Search (
 357                                 TypeManager.obsolete_attribute_type, ds.EmitContext);
 358                         if (obsolete_attr == null)
 359                                 return null;
 360
 361                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds.EmitContext);
 362                         if (obsolete == null)
 363                                 return null;
 364
 365                         caching_flags |= Flags.Obsolete;
 366                         return obsolete;
 367                 }
 368
 369                 /// <summary>
 370                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 371                 /// </summary>
 372                 public override bool IsClsCompliaceRequired (DeclSpace container)
 373                 {
 374                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 375                                 return (caching_flags & Flags.ClsCompliant) != 0;
 376
 377                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 378                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 379                                 caching_flags |= Flags.ClsCompliant;
 380                                 return true;
 381                         }
 382
 383                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 384                         return false;
 385                 }
 386
 387                 /// <summary>
 388                 /// Returns true when MemberCore is exposed from assembly.
 389                 /// </summary>
 390                 public bool IsExposedFromAssembly (DeclSpace ds)
 391                 {
 392                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 393                                 return false;
 394
 395                         DeclSpace parentContainer = ds;
 396                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 397                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 398                                         return false;
 399                                 parentContainer = parentContainer.Parent;
 400                         }
 401                         return true;
 402                 }
 403
 404                 /// <summary>
 405                 /// Resolve CLSCompliantAttribute value or gets cached value.
 406                 /// </summary>
 407                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 408                 {
 409                         if (OptAttributes != null) {
 410                                 Attribute cls_attribute = OptAttributes.Search (
 411                                         TypeManager.cls_compliant_attribute_type, ds.EmitContext);
 412                                 if (cls_attribute != null) {
 413                                         caching_flags |= Flags.HasClsCompliantAttribute;
 414                                         return cls_attribute.GetClsCompliantAttributeValue (ds.EmitContext);
 415                                 }
 416                         }
 417                         return ds.GetClsCompliantAttributeValue ();
 418                 }
 419
 420                 /// <summary>
 421                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 422                 /// </summary>
 423                 protected bool HasClsCompliantAttribute {
 424                         get {
 425                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 426                         }
 427                 }
 428
 429                 /// <summary>
 430                 /// It helps to handle error 102 & 111 detection
 431                 /// </summary>
 432                 public virtual bool MarkForDuplicationCheck ()
 433                 {
 434                         return false;
 435                 }
 436
 437                 /// <summary>
 438                 /// The main virtual method for CLS-Compliant verifications.
 439                 /// The method returns true if member is CLS-Compliant and false if member is not
 440                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 441                 /// and add their extra verifications.
 442                 /// </summary>
 443                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 444                 {
 445                         if (!IsClsCompliaceRequired (ds)) {
 446                                 if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
 447                                         if (!IsExposedFromAssembly (ds))
 448                                                 Report.Warning (3019, Location, "CLS compliance checking will not be performed on '{0}' because it is private or internal", GetSignatureForError ());
 449                                         if (!CodeGen.Assembly.IsClsCompliant)
 450                                                 Report.Warning (3021, Location, "'{0}' does not need a CLSCompliant attribute because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 451                                 }
 452                                 return false;
 453                         }
 454
 455                         if (!CodeGen.Assembly.IsClsCompliant) {
 456                                 if (HasClsCompliantAttribute) {
 457                                         Report.Error (3014, Location, "'{0}' cannot be marked as CLS-compliant because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 458                                 }
 459                                 return false;
 460                         }
 461
 462                         int index = Name.LastIndexOf ('.');
 463                         if (Name [index > 0 ? index + 1 : 0] == '_') {
 464                                 Report.Error (3008, Location, "Identifier '{0}' is not CLS-compliant", GetSignatureForError () );
 465                         }
 466                         return true;
 467                 }
 468
 469                 protected abstract void VerifyObsoleteAttribute ();
 470
 471                 //
 472                 // Raised (and passed an XmlElement that contains the comment)
 473                 // when GenerateDocComment is writing documentation expectedly.
 474                 //
 475                 internal virtual void OnGenerateDocComment (DeclSpace ds, XmlElement intermediateNode)
 476                 {
 477                 }
 478
 479                 //
 480                 // Returns a string that represents the signature for this
 481                 // member which should be used in XML documentation.
 482                 //
 483                 public virtual string GetDocCommentName (DeclSpace ds)
 484                 {
 485                         if (ds == null || this is DeclSpace)
 486                                 return DocCommentHeader + Name;
 487                         else
 488                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 489                 }
 490
 491                 //
 492                 // Generates xml doc comments (if any), and if required,
 493                 // handle warning report.
 494                 //
 495                 internal virtual void GenerateDocComment (DeclSpace ds)
 496                 {
 497                         DocUtil.GenerateDocComment (this, ds);
 498                 }
 499         }
 500
 501         /// <summary>
 502         ///   Base class for structs, classes, enumerations and interfaces.
 503         /// </summary>
 504         /// <remarks>
 505         ///   They all create new declaration spaces.  This
 506         ///   provides the common foundation for managing those name
 507         ///   spaces.
 508         /// </remarks>
 509         public abstract class DeclSpace : MemberCore, IAlias {
 510                 /// <summary>
 511                 ///   This points to the actual definition that is being
 512                 ///   created with System.Reflection.Emit
 513                 /// </summary>
 514                 public TypeBuilder TypeBuilder;
 515
 516                 //
 517                 // This is the namespace in which this typecontainer
 518                 // was declared.  We use this to resolve names.
 519                 //
 520                 public NamespaceEntry NamespaceEntry;
 521
 522                 private Hashtable Cache = new Hashtable ();
 523
 524                 public string Basename;
 525
 526                 protected Hashtable defined_names;
 527
 528                 // The emit context for toplevel objects.
 529                 protected EmitContext ec;
 530
 531                 public EmitContext EmitContext {
 532                         get { return ec; }
 533                 }
 534
 535                 static string[] attribute_targets = new string [] { "type" };
 536
 537                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 538                                   Attributes attrs, Location l)
 539                         : base (parent, name, attrs, l)
 540                 {
 541                         NamespaceEntry = ns;
 542                         Basename = name.Name;
 543                         defined_names = new Hashtable ();
 544                 }
 545
 546                 /// <summary>
 547                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 548                 /// </summary>
 549                 protected bool AddToContainer (MemberCore symbol, string name)
 550                 {
 551                         if (name == Basename && !(this is Interface) && !(this is Enum)) {
 552                                 Report.SymbolRelatedToPreviousError (this);
 553                                 Report.Error (542,  symbol.Location, "'{0}': member names cannot be the same as their enclosing type", symbol.GetSignatureForError ());
 554                                 return false;
 555                         }
 556
 557                         MemberCore mc = (MemberCore) defined_names [name];
 558
 559                         if (mc == null) {
 560                                 defined_names.Add (name, symbol);
 561                                 return true;
 562                         }
 563
 564                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 565                                 return true;
 566
 567                         Report.SymbolRelatedToPreviousError (mc);
 568                         Report.Error (102, symbol.Location, "The type '{0}' already contains a definition for '{1}'", GetSignatureForError (), name);
 569                         return false;
 570                 }
 571
 572                 public void RecordDecl ()
 573                 {
 574                         if ((NamespaceEntry != null) && (Parent == RootContext.Tree.Types))
 575                                 NamespaceEntry.DefineName (MemberName.Basename, this);
 576                 }
 577
 578                 /// <summary>
 579                 ///   Returns the MemberCore associated with a given name in the declaration
 580                 ///   space. It doesn't return method based symbols !!
 581                 /// </summary>
 582                 ///
 583                 public MemberCore GetDefinition (string name)
 584                 {
 585                         return (MemberCore)defined_names [name];
 586                 }
 587
 588                 bool in_transit = false;
 589
 590                 /// <summary>
 591                 ///   This function is used to catch recursive definitions
 592                 ///   in declarations.
 593                 /// </summary>
 594                 public bool InTransit {
 595                         get {
 596                                 return in_transit;
 597                         }
 598
 599                         set {
 600                                 in_transit = value;
 601                         }
 602                 }
 603
 604                 //
 605                 // root_types contains all the types.  All TopLevel types
 606                 // hence have a parent that points to `root_types', that is
 607                 // why there is a non-obvious test down here.
 608                 //
 609                 public bool IsTopLevel {
 610                         get {
 611                                 if (Parent != null){
 612                                         if (Parent.Parent == null)
 613                                                 return true;
 614                                 }
 615                                 return false;
 616                         }
 617                 }
 618
 619                 public virtual void CloseType ()
 620                 {
 621                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 622                                 try {
 623                                         TypeBuilder.CreateType ();
 624                                 } catch {
 625                                         //
 626                                         // The try/catch is needed because
 627                                         // nested enumerations fail to load when they
 628                                         // are defined.
 629                                         //
 630                                         // Even if this is the right order (enumerations
 631                                         // declared after types).
 632                                         //
 633                                         // Note that this still creates the type and
 634                                         // it is possible to save it
 635                                 }
 636                                 caching_flags |= Flags.CloseTypeCreated;
 637                         }
 638                 }
 639
 640                 /// <remarks>
 641                 ///  Should be overriten by the appropriate declaration space
 642                 /// </remarks>
 643                 public abstract TypeBuilder DefineType ();
 644
 645                 /// <summary>
 646                 ///   Define all members, but don't apply any attributes or do anything which may
 647                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 648                 /// </summary>
 649                 public abstract bool DefineMembers (TypeContainer parent);
 650
 651                 //
 652                 // Whether this is an `unsafe context'
 653                 //
 654                 public bool UnsafeContext {
 655                         get {
 656                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 657                                         return true;
 658                                 if (Parent != null)
 659                                         return Parent.UnsafeContext;
 660                                 return false;
 661                         }
 662                 }
 663
 664                 EmitContext type_resolve_ec;
 665                 protected EmitContext TypeResolveEmitContext {
 666                         get {
 667                                 if (type_resolve_ec == null) {
 668                                         // FIXME: I think this should really be one of:
 669                                         //
 670                                         // a. type_resolve_ec = Parent.EmitContext;
 671                                         // b. type_resolve_ec = new EmitContext (Parent, Parent, loc, null, null, ModFlags, false);
 672                                         //
 673                                         // However, if Parent == RootContext.Tree.Types, its NamespaceEntry will be null.
 674                                         //
 675                                         type_resolve_ec = new EmitContext (Parent, this, Location.Null, null, null, ModFlags, false);
 676                                 }
 677                                 return type_resolve_ec;
 678                         }
 679                 }
 680
 681                 // <summary>
 682                 //    Resolves the expression `e' for a type, and will recursively define
 683                 //    types.  This should only be used for resolving base types.
 684                 // </summary>
 685                 public TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
 686                 {
 687                         TypeResolveEmitContext.loc = loc;
 688                         TypeResolveEmitContext.ContainerType = TypeBuilder;
 689
 690                         return e.ResolveAsTypeTerminal (TypeResolveEmitContext, silent);
 691                 }
 692
 693                 public bool CheckAccessLevel (Type check_type)
 694                 {
 695                         if (check_type == TypeBuilder)
 696                                 return true;
 697
 698                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 699
 700                         //
 701                         // Broken Microsoft runtime, return public for arrays, no matter what
 702                         // the accessibility is for their underlying class, and they return
 703                         // NonPublic visibility for pointers
 704                         //
 705                         if (check_type.IsArray || check_type.IsPointer)
 706                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 707
 708                         if (TypeBuilder == null)
 709                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 710                                 //        However, this is invoked again later -- so safe to return true.
 711                                 //        May also be null when resolving top-level attributes.
 712                                 return true;
 713
 714                         switch (check_attr){
 715                         case TypeAttributes.Public:
 716                                 return true;
 717
 718                         case TypeAttributes.NotPublic:
 719                                 //
 720                                 // This test should probably use the declaringtype.
 721                                 //
 722                                 return check_type.Assembly == TypeBuilder.Assembly;
 723
 724                         case TypeAttributes.NestedPublic:
 725                                 return true;
 726
 727                         case TypeAttributes.NestedPrivate:
 728                                 return NestedAccessible (check_type);
 729
 730                         case TypeAttributes.NestedFamily:
 731                                 return FamilyAccessible (check_type);
 732
 733                         case TypeAttributes.NestedFamANDAssem:
 734                                 return (check_type.Assembly == TypeBuilder.Assembly) &&
 735                                         FamilyAccessible (check_type);
 736
 737                         case TypeAttributes.NestedFamORAssem:
 738                                 return (check_type.Assembly == TypeBuilder.Assembly) ||
 739                                         FamilyAccessible (check_type);
 740
 741                         case TypeAttributes.NestedAssembly:
 742                                 return check_type.Assembly == TypeBuilder.Assembly;
 743                         }
 744
 745                         Console.WriteLine ("HERE: " + check_attr);
 746                         return false;
 747
 748                 }
 749
 750                 protected bool NestedAccessible (Type check_type)
 751                 {
 752                         Type declaring = check_type.DeclaringType;
 753                         return TypeBuilder == declaring ||
 754                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 755                 }
 756
 757                 protected bool FamilyAccessible (Type check_type)
 758                 {
 759                         Type declaring = check_type.DeclaringType;
 760                         if (TypeBuilder == declaring ||
 761                             TypeBuilder.IsSubclassOf (declaring))
 762                                 return true;
 763
 764                         return NestedAccessible (check_type);
 765                 }
 766
 767                 // Access level of a type.
 768                 const int X = 1;
 769                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 770                                             // Public    Assembly   Protected
 771                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 772                         Public              = (X << 0) | (X << 1) | (X << 2),
 773                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 774                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 775                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 776                 }
 777
 778                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 779                 {
 780                         if ((flags & Modifiers.INTERNAL) != 0) {
 781
 782                                 if ((flags & Modifiers.PROTECTED) != 0)
 783                                         return AccessLevel.ProtectedOrInternal;
 784                                 else
 785                                         return AccessLevel.Internal;
 786
 787                         } else if ((flags & Modifiers.PROTECTED) != 0)
 788                                 return AccessLevel.Protected;
 789
 790                         else if ((flags & Modifiers.PRIVATE) != 0)
 791                                 return AccessLevel.Private;
 792
 793                         else
 794                                 return AccessLevel.Public;
 795                 }
 796
 797                 // What is the effective access level of this?
 798                 // TODO: Cache this?
 799                 AccessLevel EffectiveAccessLevel {
 800                         get {
 801                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 802                                 if (!IsTopLevel && (Parent != null))
 803                                         return myAccess & Parent.EffectiveAccessLevel;
 804                                 else
 805                                         return myAccess;
 806                         }
 807                 }
 808
 809                 // Return the access level for type `t'
 810                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 811                 {
 812                         if (t.IsPublic)
 813                                 return AccessLevel.Public;
 814                         if (t.IsNestedPrivate)
 815                                 return AccessLevel.Private;
 816                         if (t.IsNotPublic)
 817                                 return AccessLevel.Internal;
 818
 819                         // By now, it must be nested
 820                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
 821
 822                         if (t.IsNestedPublic)
 823                                 return parentLevel;
 824                         if (t.IsNestedAssembly)
 825                                 return parentLevel & AccessLevel.Internal;
 826                         if (t.IsNestedFamily)
 827                                 return parentLevel & AccessLevel.Protected;
 828                         if (t.IsNestedFamORAssem)
 829                                 return parentLevel & AccessLevel.ProtectedOrInternal;
 830                         if (t.IsNestedFamANDAssem)
 831                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 832
 833                         // nested private is taken care of
 834
 835                         throw new Exception ("I give up, what are you?");
 836                 }
 837
 838                 //
 839                 // This answers `is the type P, as accessible as a member M which has the
 840                 // accessability @flags which is declared as a nested member of the type T, this declspace'
 841                 //
 842                 public bool AsAccessible (Type p, int flags)
 843                 {
 844                         //
 845                         // 1) if M is private, its accessability is the same as this declspace.
 846                         // we already know that P is accessible to T before this method, so we
 847                         // may return true.
 848                         //
 849
 850                         if ((flags & Modifiers.PRIVATE) != 0)
 851                                 return true;
 852
 853                         while (p.IsArray || p.IsPointer || p.IsByRef)
 854                                 p = TypeManager.GetElementType (p);
 855
 856                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
 857                         AccessLevel mAccess = this.EffectiveAccessLevel &
 858                                 GetAccessLevelFromModifiers (flags);
 859
 860                         // for every place from which we can access M, we must
 861                         // be able to access P as well. So, we want
 862                         // For every bit in M and P, M_i -> P_1 == true
 863                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
 864
 865                         return ~ (~ mAccess | pAccess) == 0;
 866                 }
 867
 868                 public static void Error_AmbiguousTypeReference (Location loc, string name, string t1, string t2)
 869                 {
 870                         Report.Error (104, loc,
 871                                       "`{0}' is an ambiguous reference ({1} or {2})",
 872                                       name, t1, t2);
 873                 }
 874
 875                 //
 876                 // Return the nested type with name @name.  Ensures that the nested type
 877                 // is defined if necessary.  Do _not_ use this when you have a MemberCache handy.
 878                 //
 879                 public virtual Type FindNestedType (string name)
 880                 {
 881                         return null;
 882                 }
 883
 884                 private Type LookupNestedTypeInHierarchy (string name)
 885                 {
 886                         // if the member cache has been created, lets use it.
 887                         // the member cache is MUCH faster.
 888                         if (MemberCache != null)
 889                                 return MemberCache.FindNestedType (name);
 890
 891                         // no member cache. Do it the hard way -- reflection
 892                         Type t = null;
 893                         for (Type current_type = TypeBuilder;
 894                              current_type != null && current_type != TypeManager.object_type;
 895                              current_type = current_type.BaseType) {
 896                                 if (current_type is TypeBuilder) {
 897                                         DeclSpace decl = this;
 898                                         if (current_type != TypeBuilder)
 899                                                 decl = TypeManager.LookupDeclSpace (current_type);
 900                                         t = decl.FindNestedType (name);
 901                                 } else {
 902                                         t = TypeManager.GetNestedType (current_type, name);
 903                                 }
 904
 905                                 if (t != null && CheckAccessLevel (t))
 906                                         return t;
 907                         }
 908
 909                         return null;
 910                 }
 911
 912                 //
 913                 // Public function used to locate types, this can only
 914                 // be used after the ResolveTree function has been invoked.
 915                 //
 916                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
 917                 //
 918                 // Returns: Type or null if they type can not be found.
 919                 //
 920                 public FullNamedExpression LookupType (string name, Location loc, bool ignore_cs0104)
 921                 {
 922                         if (this is PartialContainer)
 923                                 throw new InternalErrorException ("Should not get here");
 924
 925                         if (Cache.Contains (name))
 926                                 return (FullNamedExpression) Cache [name];
 927
 928                         FullNamedExpression e;
 929                         Type t = LookupNestedTypeInHierarchy (name);
 930                         if (t != null)
 931                                 e = new TypeExpression (t, Location.Null);
 932                         else if (Parent != null && Parent != RootContext.Tree.Types)
 933                                 e = Parent.LookupType (name, loc, ignore_cs0104);
 934                         else
 935                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
 936
 937                         Cache [name] = e;
 938                         return e;
 939                 }
 940
 941                 /// <remarks>
 942                 ///   This function is broken and not what you're looking for.  It should only
 943                 ///   be used while the type is still being created since it doesn't use the cache
 944                 ///   and relies on the filter doing the member name check.
 945                 /// </remarks>
 946                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
 947                                                         MemberFilter filter, object criteria);
 948
 949                 /// <remarks>
 950                 ///   If we have a MemberCache, return it.  This property may return null if the
 951                 ///   class doesn't have a member cache or while it's still being created.
 952                 /// </remarks>
 953                 public abstract MemberCache MemberCache {
 954                         get;
 955                 }
 956
 957                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
 958                 {
 959                         if (a.Type == TypeManager.required_attr_type) {
 960                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
 961                                 return;
 962                         }
 963                         TypeBuilder.SetCustomAttribute (cb);
 964                 }
 965
 966                 /// <summary>
 967                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
 968                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
 969                 /// </summary>
 970                 public bool GetClsCompliantAttributeValue ()
 971                 {
 972                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
 973                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
 974
 975                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
 976
 977                         if (OptAttributes != null) {
 978                                 Attribute cls_attribute = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, ec);
 979                                 if (cls_attribute != null) {
 980                                         caching_flags |= Flags.HasClsCompliantAttribute;
 981                                         if (cls_attribute.GetClsCompliantAttributeValue (ec)) {
 982                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 983                                                 return true;
 984                                         }
 985                                         return false;
 986                                 }
 987                         }
 988
 989                         if (Parent == null) {
 990                                 if (CodeGen.Assembly.IsClsCompliant) {
 991                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
 992                                         return true;
 993                                 }
 994                                 return false;
 995                         }
 996
 997                         if (Parent.GetClsCompliantAttributeValue ()) {
 998                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 999                                 return true;
1000                         }
1001                         return false;
1002                 }
1003
1004                 public override string[] ValidAttributeTargets {
1005                         get {
1006                                 return attribute_targets;
1007                         }
1008                 }
1009
1010                 bool IAlias.IsType {
1011                         get { return true; }
1012                 }
1013
1014                 string IAlias.Name {
1015                         get { return Name; }
1016                 }
1017
1018                 TypeExpr IAlias.ResolveAsType (EmitContext ec)
1019                 {
1020                         if (TypeBuilder == null)
1021                                 throw new InvalidOperationException ();
1022
1023                         return new TypeExpression (TypeBuilder, Location);
1024                 }
1025         }
1026
1027         /// <summary>
1028         ///   This is a readonly list of MemberInfo's.
1029         /// </summary>
1030         public class MemberList : IList {
1031                 public readonly IList List;
1032                 int count;
1033
1034                 /// <summary>
1035                 ///   Create a new MemberList from the given IList.
1036                 /// </summary>
1037                 public MemberList (IList list)
1038                 {
1039                         if (list != null)
1040                                 this.List = list;
1041                         else
1042                                 this.List = new ArrayList ();
1043                         count = List.Count;
1044                 }
1045
1046                 /// <summary>
1047                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1048                 /// </summary>
1049                 public MemberList (IList first, IList second)
1050                 {
1051                         ArrayList list = new ArrayList ();
1052                         list.AddRange (first);
1053                         list.AddRange (second);
1054                         count = list.Count;
1055                         List = list;
1056                 }
1057
1058                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1059
1060                 /// <summary>
1061                 ///   Cast the MemberList into a MemberInfo[] array.
1062                 /// </summary>
1063                 /// <remarks>
1064                 ///   This is an expensive operation, only use it if it's really necessary.
1065                 /// </remarks>
1066                 public static explicit operator MemberInfo [] (MemberList list)
1067                 {
1068                         Timer.StartTimer (TimerType.MiscTimer);
1069                         MemberInfo [] result = new MemberInfo [list.Count];
1070                         list.CopyTo (result, 0);
1071                         Timer.StopTimer (TimerType.MiscTimer);
1072                         return result;
1073                 }
1074
1075                 // ICollection
1076
1077                 public int Count {
1078                         get {
1079                                 return count;
1080                         }
1081                 }
1082
1083                 public bool IsSynchronized {
1084                         get {
1085                                 return List.IsSynchronized;
1086                         }
1087                 }
1088
1089                 public object SyncRoot {
1090                         get {
1091                                 return List.SyncRoot;
1092                         }
1093                 }
1094
1095                 public void CopyTo (Array array, int index)
1096                 {
1097                         List.CopyTo (array, index);
1098                 }
1099
1100                 // IEnumerable
1101
1102                 public IEnumerator GetEnumerator ()
1103                 {
1104                         return List.GetEnumerator ();
1105                 }
1106
1107                 // IList
1108
1109                 public bool IsFixedSize {
1110                         get {
1111                                 return true;
1112                         }
1113                 }
1114
1115                 public bool IsReadOnly {
1116                         get {
1117                                 return true;
1118                         }
1119                 }
1120
1121                 object IList.this [int index] {
1122                         get {
1123                                 return List [index];
1124                         }
1125
1126                         set {
1127                                 throw new NotSupportedException ();
1128                         }
1129                 }
1130
1131                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1132                 public MemberInfo this [int index] {
1133                         get {
1134                                 return (MemberInfo) List [index];
1135                         }
1136                 }
1137
1138                 public int Add (object value)
1139                 {
1140                         throw new NotSupportedException ();
1141                 }
1142
1143                 public void Clear ()
1144                 {
1145                         throw new NotSupportedException ();
1146                 }
1147
1148                 public bool Contains (object value)
1149                 {
1150                         return List.Contains (value);
1151                 }
1152
1153                 public int IndexOf (object value)
1154                 {
1155                         return List.IndexOf (value);
1156                 }
1157
1158                 public void Insert (int index, object value)
1159                 {
1160                         throw new NotSupportedException ();
1161                 }
1162
1163                 public void Remove (object value)
1164                 {
1165                         throw new NotSupportedException ();
1166                 }
1167
1168                 public void RemoveAt (int index)
1169                 {
1170                         throw new NotSupportedException ();
1171                 }
1172         }
1173
1174         /// <summary>
1175         ///   This interface is used to get all members of a class when creating the
1176         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1177         ///   want to support the member cache and by TypeHandle to get caching of
1178         ///   non-dynamic types.
1179         /// </summary>
1180         public interface IMemberContainer {
1181                 /// <summary>
1182                 ///   The name of the IMemberContainer.  This is only used for
1183                 ///   debugging purposes.
1184                 /// </summary>
1185                 string Name {
1186                         get;
1187                 }
1188
1189                 /// <summary>
1190                 ///   The type of this IMemberContainer.
1191                 /// </summary>
1192                 Type Type {
1193                         get;
1194                 }
1195
1196                 /// <summary>
1197                 ///   Returns the IMemberContainer of the base class or null if this
1198                 ///   is an interface or TypeManger.object_type.
1199                 ///   This is used when creating the member cache for a class to get all
1200                 ///   members from the base class.
1201                 /// </summary>
1202                 MemberCache BaseCache {
1203                         get;
1204                 }
1205
1206                 /// <summary>
1207                 ///   Whether this is an interface.
1208                 /// </summary>
1209                 bool IsInterface {
1210                         get;
1211                 }
1212
1213                 /// <summary>
1214                 ///   Returns all members of this class with the corresponding MemberTypes
1215                 ///   and BindingFlags.
1216                 /// </summary>
1217                 /// <remarks>
1218                 ///   When implementing this method, make sure not to return any inherited
1219                 ///   members and check the MemberTypes and BindingFlags properly.
1220                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1221                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1222                 ///   MemberInfo class, but the cache needs this information.  That's why
1223                 ///   this method is called multiple times with different BindingFlags.
1224                 /// </remarks>
1225                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1226
1227                 /// <summary>
1228                 ///   Return the container's member cache.
1229                 /// </summary>
1230                 MemberCache MemberCache {
1231                         get;
1232                 }
1233         }
1234
1235         /// <summary>
1236         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1237         ///   member lookups.  It has a member name based hash table; it maps each member
1238         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1239         ///   and the BindingFlags that were initially used to get it.  The cache contains
1240         ///   all members of the current class and all inherited members.  If this cache is
1241         ///   for an interface types, it also contains all inherited members.
1242         ///
1243         ///   There are two ways to get a MemberCache:
1244         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1245         ///     use the DeclSpace.MemberCache property.
1246         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1247         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1248         /// </summary>
1249         public class MemberCache {
1250                 public readonly IMemberContainer Container;
1251                 protected Hashtable member_hash;
1252                 protected Hashtable method_hash;
1253
1254                 /// <summary>
1255                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1256                 /// </summary>
1257                 public MemberCache (IMemberContainer container)
1258                 {
1259                         this.Container = container;
1260
1261                         Timer.IncrementCounter (CounterType.MemberCache);
1262                         Timer.StartTimer (TimerType.CacheInit);
1263
1264                         // If we have a base class (we have a base class unless we're
1265                         // TypeManager.object_type), we deep-copy its MemberCache here.
1266                         if (Container.BaseCache != null)
1267                                 member_hash = SetupCache (Container.BaseCache);
1268                         else
1269                                 member_hash = new Hashtable ();
1270
1271                         // If this is neither a dynamic type nor an interface, create a special
1272                         // method cache with all declared and inherited methods.
1273                         Type type = container.Type;
1274                         if (!(type is TypeBuilder) && !type.IsInterface &&
1275                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1276                                 method_hash = new Hashtable ();
1277                                 AddMethods (type);
1278                         }
1279
1280                         // Add all members from the current class.
1281                         AddMembers (Container);
1282
1283                         Timer.StopTimer (TimerType.CacheInit);
1284                 }
1285
1286                 public MemberCache (Type[] ifaces)
1287                 {
1288                         //
1289                         // The members of this cache all belong to other caches.
1290                         // So, 'Container' will not be used.
1291                         //
1292                         this.Container = null;
1293
1294                         member_hash = new Hashtable ();
1295                         if (ifaces == null)
1296                                 return;
1297
1298                         foreach (Type itype in ifaces)
1299                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1300                 }
1301
1302                 /// <summary>
1303                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1304                 /// </summary>
1305                 Hashtable SetupCache (MemberCache base_class)
1306                 {
1307                         Hashtable hash = new Hashtable ();
1308
1309                         if (base_class == null)
1310                                 return hash;
1311
1312                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1313                         while (it.MoveNext ()) {
1314                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1315                          }
1316
1317                         return hash;
1318                 }
1319
1320                 /// <summary>
1321                 ///   Add the contents of `cache' to the member_hash.
1322                 /// </summary>
1323                 void AddCacheContents (MemberCache cache)
1324                 {
1325                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1326                         while (it.MoveNext ()) {
1327                                 ArrayList list = (ArrayList) member_hash [it.Key];
1328                                 if (list == null)
1329                                         member_hash [it.Key] = list = new ArrayList ();
1330
1331                                 ArrayList entries = (ArrayList) it.Value;
1332                                 for (int i = entries.Count-1; i >= 0; i--) {
1333                                         CacheEntry entry = (CacheEntry) entries [i];
1334
1335                                         if (entry.Container != cache.Container)
1336                                                 break;
1337                                         list.Add (entry);
1338                                 }
1339                         }
1340                 }
1341
1342                 /// <summary>
1343                 ///   Add all members from class `container' to the cache.
1344                 /// </summary>
1345                 void AddMembers (IMemberContainer container)
1346                 {
1347                         // We need to call AddMembers() with a single member type at a time
1348                         // to get the member type part of CacheEntry.EntryType right.
1349                         if (!container.IsInterface) {
1350                                 AddMembers (MemberTypes.Constructor, container);
1351                                 AddMembers (MemberTypes.Field, container);
1352                         }
1353                         AddMembers (MemberTypes.Method, container);
1354                         AddMembers (MemberTypes.Property, container);
1355                         AddMembers (MemberTypes.Event, container);
1356                         // Nested types are returned by both Static and Instance searches.
1357                         AddMembers (MemberTypes.NestedType,
1358                                     BindingFlags.Static | BindingFlags.Public, container);
1359                         AddMembers (MemberTypes.NestedType,
1360                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1361                 }
1362
1363                 void AddMembers (MemberTypes mt, IMemberContainer container)
1364                 {
1365                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1366                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1367                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1368                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1369                 }
1370
1371                 /// <summary>
1372                 ///   Add all members from class `container' with the requested MemberTypes and
1373                 ///   BindingFlags to the cache.  This method is called multiple times with different
1374                 ///   MemberTypes and BindingFlags.
1375                 /// </summary>
1376                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1377                 {
1378                         MemberList members = container.GetMembers (mt, bf);
1379
1380                         foreach (MemberInfo member in members) {
1381                                 string name = member.Name;
1382
1383                                 // We use a name-based hash table of ArrayList's.
1384                                 ArrayList list = (ArrayList) member_hash [name];
1385                                 if (list == null) {
1386                                         list = new ArrayList ();
1387                                         member_hash.Add (name, list);
1388                                 }
1389
1390                                 // When this method is called for the current class, the list will
1391                                 // already contain all inherited members from our base classes.
1392                                 // We cannot add new members in front of the list since this'd be an
1393                                 // expensive operation, that's why the list is sorted in reverse order
1394                                 // (ie. members from the current class are coming last).
1395                                 list.Add (new CacheEntry (container, member, mt, bf));
1396                         }
1397                 }
1398
1399                 /// <summary>
1400                 ///   Add all declared and inherited methods from class `type' to the method cache.
1401                 /// </summary>
1402                 void AddMethods (Type type)
1403                 {
1404                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1405                                     BindingFlags.FlattenHierarchy, type);
1406                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1407                                     BindingFlags.FlattenHierarchy, type);
1408                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1409                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1410                 }
1411
1412                 void AddMethods (BindingFlags bf, Type type)
1413                 {
1414                         //
1415                         // Consider the case:
1416                         //
1417                         //   class X { public virtual int f() {} }
1418                         //   class Y : X {}
1419                         //
1420                         // When processing 'Y', the method_cache will already have a copy of 'f',
1421                         // with ReflectedType == X.  However, we want to ensure that its ReflectedType == Y
1422                         //
1423                         MethodBase [] members = type.GetMethods (bf);
1424
1425                         Array.Reverse (members);
1426
1427                         foreach (MethodBase member in members) {
1428                                 string name = member.Name;
1429
1430                                 // We use a name-based hash table of ArrayList's.
1431                                 ArrayList list = (ArrayList) method_hash [name];
1432                                 if (list == null) {
1433                                         list = new ArrayList ();
1434                                         method_hash.Add (name, list);
1435                                 }
1436
1437                                 if (member.IsVirtual &&
1438                                     (member.Attributes & MethodAttributes.NewSlot) == 0) {
1439                                         MethodInfo base_method = ((MethodInfo) member).GetBaseDefinition ();
1440
1441                                         if (base_method == member) {
1442                                                 //
1443                                                 // Both mcs and CSC 1.1 seem to emit a somewhat broken
1444                                                 // ...Invoke () function for delegates: it's missing a 'newslot'.
1445                                                 // CSC 2.0 emits a 'newslot' for a delegate's Invoke.
1446                                                 //
1447                                                 if (member.Name != "Invoke" ||
1448                                                     !type.IsSubclassOf (TypeManager.multicast_delegate_type)) {
1449                                                         Report.SymbolRelatedToPreviousError (base_method);
1450                                                         Report.Warning (-28,
1451                                                                 "The method '{0}' is marked 'override'," +
1452                                                                 " but doesn't appear to override any virtual or abstract method:" +
1453                                                                 " it may be ignored during overload resolution",
1454                                                                 TypeManager.CSharpSignature (base_method));
1455                                                 }
1456                                                 goto skip;
1457                                         }
1458
1459                                         for (;;) {
1460                                                 list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1461                                                 if ((base_method.Attributes & MethodAttributes.NewSlot) != 0)
1462                                                         break;
1463
1464                                                 //
1465                                                 // Shouldn't get here.  Mono appears to be buggy.
1466                                                 //
1467                                                 MethodInfo new_base_method = base_method.GetBaseDefinition ();
1468                                                 if (new_base_method == base_method) {
1469                                                         Report.SymbolRelatedToPreviousError (base_method);
1470                                                         Report.Warning (-28,
1471                                                                 "The method '{0}' is marked 'override'," +
1472                                                                 " but doesn't appear to overrided any virtual or abstract method:" +
1473                                                                 " it may be ignored during overload resolution",
1474                                                                 TypeManager.CSharpSignature (base_method));
1475                                                         break;
1476                                                 }
1477                                                 base_method = new_base_method;
1478                                         }
1479
1480
1481                                 }
1482                         skip:
1483
1484                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1485                                 // sorted so we need to do this check for every member.
1486                                 BindingFlags new_bf = bf;
1487                                 if (member.DeclaringType == type)
1488                                         new_bf |= BindingFlags.DeclaredOnly;
1489
1490                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1491                         }
1492                 }
1493
1494                 /// <summary>
1495                 ///   Compute and return a appropriate `EntryType' magic number for the given
1496                 ///   MemberTypes and BindingFlags.
1497                 /// </summary>
1498                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1499                 {
1500                         EntryType type = EntryType.None;
1501
1502                         if ((mt & MemberTypes.Constructor) != 0)
1503                                 type |= EntryType.Constructor;
1504                         if ((mt & MemberTypes.Event) != 0)
1505                                 type |= EntryType.Event;
1506                         if ((mt & MemberTypes.Field) != 0)
1507                                 type |= EntryType.Field;
1508                         if ((mt & MemberTypes.Method) != 0)
1509                                 type |= EntryType.Method;
1510                         if ((mt & MemberTypes.Property) != 0)
1511                                 type |= EntryType.Property;
1512                         // Nested types are returned by static and instance searches.
1513                         if ((mt & MemberTypes.NestedType) != 0)
1514                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1515
1516                         if ((bf & BindingFlags.Instance) != 0)
1517                                 type |= EntryType.Instance;
1518                         if ((bf & BindingFlags.Static) != 0)
1519                                 type |= EntryType.Static;
1520                         if ((bf & BindingFlags.Public) != 0)
1521                                 type |= EntryType.Public;
1522                         if ((bf & BindingFlags.NonPublic) != 0)
1523                                 type |= EntryType.NonPublic;
1524                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1525                                 type |= EntryType.Declared;
1526
1527                         return type;
1528                 }
1529
1530                 /// <summary>
1531                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1532                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1533                 ///   single member types.
1534                 /// </summary>
1535                 public static bool IsSingleMemberType (MemberTypes mt)
1536                 {
1537                         switch (mt) {
1538                         case MemberTypes.Constructor:
1539                         case MemberTypes.Event:
1540                         case MemberTypes.Field:
1541                         case MemberTypes.Method:
1542                         case MemberTypes.Property:
1543                         case MemberTypes.NestedType:
1544                                 return true;
1545
1546                         default:
1547                                 return false;
1548                         }
1549                 }
1550
1551                 /// <summary>
1552                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1553                 ///   number to speed up the searching process.
1554                 /// </summary>
1555                 [Flags]
1556                 protected enum EntryType {
1557                         None            = 0x000,
1558
1559                         Instance        = 0x001,
1560                         Static          = 0x002,
1561                         MaskStatic      = Instance|Static,
1562
1563                         Public          = 0x004,
1564                         NonPublic       = 0x008,
1565                         MaskProtection  = Public|NonPublic,
1566
1567                         Declared        = 0x010,
1568
1569                         Constructor     = 0x020,
1570                         Event           = 0x040,
1571                         Field           = 0x080,
1572                         Method          = 0x100,
1573                         Property        = 0x200,
1574                         NestedType      = 0x400,
1575
1576                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1577                 }
1578
1579                 protected class CacheEntry {
1580                         public readonly IMemberContainer Container;
1581                         public readonly EntryType EntryType;
1582                         public readonly MemberInfo Member;
1583
1584                         public CacheEntry (IMemberContainer container, MemberInfo member,
1585                                            MemberTypes mt, BindingFlags bf)
1586                         {
1587                                 this.Container = container;
1588                                 this.Member = member;
1589                                 this.EntryType = GetEntryType (mt, bf);
1590                         }
1591
1592                         public override string ToString ()
1593                         {
1594                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1595                                                       EntryType, Member);
1596                         }
1597                 }
1598
1599                 /// <summary>
1600                 ///   This is called each time we're walking up one level in the class hierarchy
1601                 ///   and checks whether we can abort the search since we've already found what
1602                 ///   we were looking for.
1603                 /// </summary>
1604                 protected bool DoneSearching (ArrayList list)
1605                 {
1606                         //
1607                         // We've found exactly one member in the current class and it's not
1608                         // a method or constructor.
1609                         //
1610                         if (list.Count == 1 && !(list [0] is MethodBase))
1611                                 return true;
1612
1613                         //
1614                         // Multiple properties: we query those just to find out the indexer
1615                         // name
1616                         //
1617                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1618                                 return true;
1619
1620                         return false;
1621                 }
1622
1623                 /// <summary>
1624                 ///   Looks up members with name `name'.  If you provide an optional
1625                 ///   filter function, it'll only be called with members matching the
1626                 ///   requested member name.
1627                 ///
1628                 ///   This method will try to use the cache to do the lookup if possible.
1629                 ///
1630                 ///   Unlike other FindMembers implementations, this method will always
1631                 ///   check all inherited members - even when called on an interface type.
1632                 ///
1633                 ///   If you know that you're only looking for methods, you should use
1634                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1635                 ///   When doing a method-only search, it'll try to use a special method
1636                 ///   cache (unless it's a dynamic type or an interface) and the returned
1637                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1638                 ///   The lookup process will automatically restart itself in method-only
1639                 ///   search mode if it discovers that it's about to return methods.
1640                 /// </summary>
1641                 ArrayList global = new ArrayList ();
1642                 bool using_global = false;
1643
1644                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1645
1646                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1647                                                   MemberFilter filter, object criteria)
1648                 {
1649                         if (using_global)
1650                                 throw new Exception ();
1651
1652                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1653                         bool method_search = mt == MemberTypes.Method;
1654                         // If we have a method cache and we aren't already doing a method-only search,
1655                         // then we restart a method search if the first match is a method.
1656                         bool do_method_search = !method_search && (method_hash != null);
1657
1658                         ArrayList applicable;
1659
1660                         // If this is a method-only search, we try to use the method cache if
1661                         // possible; a lookup in the method cache will return a MemberInfo with
1662                         // the correct ReflectedType for inherited methods.
1663
1664                         if (method_search && (method_hash != null))
1665                                 applicable = (ArrayList) method_hash [name];
1666                         else
1667                                 applicable = (ArrayList) member_hash [name];
1668
1669                         if (applicable == null)
1670                                 return emptyMemberInfo;
1671
1672                         //
1673                         // 32  slots gives 53 rss/54 size
1674                         // 2/4 slots gives 55 rss
1675                         //
1676                         // Strange: from 25,000 calls, only 1,800
1677                         // are above 2.  Why does this impact it?
1678                         //
1679                         global.Clear ();
1680                         using_global = true;
1681
1682                         Timer.StartTimer (TimerType.CachedLookup);
1683
1684                         EntryType type = GetEntryType (mt, bf);
1685
1686                         IMemberContainer current = Container;
1687
1688
1689                         // `applicable' is a list of all members with the given member name `name'
1690                         // in the current class and all its base classes.  The list is sorted in
1691                         // reverse order due to the way how the cache is initialy created (to speed
1692                         // things up, we're doing a deep-copy of our base).
1693
1694                         for (int i = applicable.Count-1; i >= 0; i--) {
1695                                 CacheEntry entry = (CacheEntry) applicable [i];
1696
1697                                 // This happens each time we're walking one level up in the class
1698                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
1699                                 // the first time this happens (this may already happen in the first
1700                                 // iteration of this loop if there are no members with the name we're
1701                                 // looking for in the current class).
1702                                 if (entry.Container != current) {
1703                                         if (declared_only || DoneSearching (global))
1704                                                 break;
1705
1706                                         current = entry.Container;
1707                                 }
1708
1709                                 // Is the member of the correct type ?
1710                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
1711                                         continue;
1712
1713                                 // Is the member static/non-static ?
1714                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
1715                                         continue;
1716
1717                                 // Apply the filter to it.
1718                                 if (filter (entry.Member, criteria)) {
1719                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
1720                                                 do_method_search = false;
1721                                         global.Add (entry.Member);
1722                                 }
1723                         }
1724
1725                         Timer.StopTimer (TimerType.CachedLookup);
1726
1727                         // If we have a method cache and we aren't already doing a method-only
1728                         // search, we restart in method-only search mode if the first match is
1729                         // a method.  This ensures that we return a MemberInfo with the correct
1730                         // ReflectedType for inherited methods.
1731                         if (do_method_search && (global.Count > 0)){
1732                                 using_global = false;
1733
1734                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
1735                         }
1736
1737                         using_global = false;
1738                         MemberInfo [] copy = new MemberInfo [global.Count];
1739                         global.CopyTo (copy);
1740                         return copy;
1741                 }
1742
1743                 // find the nested type @name in @this.
1744                 public Type FindNestedType (string name)
1745                 {
1746                         ArrayList applicable = (ArrayList) member_hash [name];
1747                         if (applicable == null)
1748                                 return null;
1749
1750                         for (int i = applicable.Count-1; i >= 0; i--) {
1751                                 CacheEntry entry = (CacheEntry) applicable [i];
1752                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
1753                                         return (Type) entry.Member;
1754                         }
1755
1756                         return null;
1757                 }
1758
1759                 //
1760                 // This finds the method or property for us to override. invocationType is the type where
1761                 // the override is going to be declared, name is the name of the method/property, and
1762                 // paramTypes is the parameters, if any to the method or property
1763                 //
1764                 // Because the MemberCache holds members from this class and all the base classes,
1765                 // we can avoid tons of reflection stuff.
1766                 //
1767                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
1768                 {
1769                         ArrayList applicable;
1770                         if (method_hash != null && !is_property)
1771                                 applicable = (ArrayList) method_hash [name];
1772                         else
1773                                 applicable = (ArrayList) member_hash [name];
1774
1775                         if (applicable == null)
1776                                 return null;
1777                         //
1778                         // Walk the chain of methods, starting from the top.
1779                         //
1780                         for (int i = applicable.Count - 1; i >= 0; i--) {
1781                                 CacheEntry entry = (CacheEntry) applicable [i];
1782
1783                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
1784                                         continue;
1785
1786                                 PropertyInfo pi = null;
1787                                 MethodInfo mi = null;
1788                                 FieldInfo fi = null;
1789                                 Type [] cmpAttrs = null;
1790
1791                                 if (is_property) {
1792                                         if ((entry.EntryType & EntryType.Field) != 0) {
1793                                                 fi = (FieldInfo)entry.Member;
1794
1795                                                 // TODO: For this case we ignore member type
1796                                                 //fb = TypeManager.GetField (fi);
1797                                                 //cmpAttrs = new Type[] { fb.MemberType };
1798                                         } else {
1799                                                 pi = (PropertyInfo) entry.Member;
1800                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
1801                                         }
1802                                 } else {
1803                                         mi = (MethodInfo) entry.Member;
1804                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
1805                                 }
1806
1807                                 if (fi != null) {
1808                                         // TODO: Almost duplicate !
1809                                         // Check visibility
1810                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
1811                                                 case FieldAttributes.Private:
1812                                                         //
1813                                                         // A private method is Ok if we are a nested subtype.
1814                                                         // The spec actually is not very clear about this, see bug 52458.
1815                                                         //
1816                                                         if (invocationType != entry.Container.Type &
1817                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1818                                                                 continue;
1819
1820                                                         break;
1821                                                 case FieldAttributes.FamANDAssem:
1822                                                 case FieldAttributes.Assembly:
1823                                                         //
1824                                                         // Check for assembly methods
1825                                                         //
1826                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
1827                                                                 continue;
1828                                                         break;
1829                                         }
1830                                         return entry.Member;
1831                                 }
1832
1833                                 //
1834                                 // Check the arguments
1835                                 //
1836                                 if (cmpAttrs.Length != paramTypes.Length)
1837                                         continue;
1838
1839                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --)
1840                                         if (paramTypes [j] != cmpAttrs [j])
1841                                                 goto next;
1842
1843                                 //
1844                                 // get one of the methods because this has the visibility info.
1845                                 //
1846                                 if (is_property) {
1847                                         mi = pi.GetGetMethod (true);
1848                                         if (mi == null)
1849                                                 mi = pi.GetSetMethod (true);
1850                                 }
1851
1852                                 //
1853                                 // Check visibility
1854                                 //
1855                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
1856                                 case MethodAttributes.Private:
1857                                         //
1858                                         // A private method is Ok if we are a nested subtype.
1859                                         // The spec actually is not very clear about this, see bug 52458.
1860                                         //
1861                                         if (invocationType == entry.Container.Type ||
1862                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1863                                                 return entry.Member;
1864
1865                                         break;
1866                                 case MethodAttributes.FamANDAssem:
1867                                 case MethodAttributes.Assembly:
1868                                         //
1869                                         // Check for assembly methods
1870                                         //
1871                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
1872                                                 return entry.Member;
1873
1874                                         break;
1875                                 default:
1876                                         //
1877                                         // A protected method is ok, because we are overriding.
1878                                         // public is always ok.
1879                                         //
1880                                         return entry.Member;
1881                                 }
1882                         next:
1883                                 ;
1884                         }
1885
1886                         return null;
1887                 }
1888
1889                 /// <summary>
1890                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
1891                 /// We handle two cases. The first is for types without parameters (events, field, properties).
1892                 /// The second are methods, indexers and this is why ignore_complex_types is here.
1893                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
1894                 /// </summary>
1895                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
1896                 {
1897                         ArrayList applicable = null;
1898
1899                         if (method_hash != null)
1900                                 applicable = (ArrayList) method_hash [name];
1901
1902                         if (applicable != null) {
1903                                 for (int i = applicable.Count - 1; i >= 0; i--) {
1904                                         CacheEntry entry = (CacheEntry) applicable [i];
1905                                         if ((entry.EntryType & EntryType.Public) != 0)
1906                                                 return entry.Member;
1907                                 }
1908                         }
1909
1910                         if (member_hash == null)
1911                                 return null;
1912                         applicable = (ArrayList) member_hash [name];
1913
1914                         if (applicable != null) {
1915                                 for (int i = applicable.Count - 1; i >= 0; i--) {
1916                                         CacheEntry entry = (CacheEntry) applicable [i];
1917                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
1918                                                 if (ignore_complex_types) {
1919                                                         if ((entry.EntryType & EntryType.Method) != 0)
1920                                                                 continue;
1921
1922                                                         // Does exist easier way how to detect indexer ?
1923                                                         if ((entry.EntryType & EntryType.Property) != 0) {
1924                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
1925                                                                 if (arg_types.Length > 0)
1926                                                                         continue;
1927                                                         }
1928                                                 }
1929                                                 return entry.Member;
1930                                         }
1931                                 }
1932                         }
1933                         return null;
1934                 }
1935
1936                 Hashtable locase_table;
1937
1938                 /// <summary>
1939                 /// Builds low-case table for CLS Compliance test
1940                 /// </summary>
1941                 public Hashtable GetPublicMembers ()
1942                 {
1943                         if (locase_table != null)
1944                                 return locase_table;
1945
1946                         locase_table = new Hashtable ();
1947                         foreach (DictionaryEntry entry in member_hash) {
1948                                 ArrayList members = (ArrayList)entry.Value;
1949                                 for (int ii = 0; ii < members.Count; ++ii) {
1950                                         CacheEntry member_entry = (CacheEntry) members [ii];
1951
1952                                         if ((member_entry.EntryType & EntryType.Public) == 0)
1953                                                 continue;
1954
1955                                         // TODO: Does anyone know easier way how to detect that member is internal ?
1956                                         switch (member_entry.EntryType & EntryType.MaskType) {
1957                                                 case EntryType.Constructor:
1958                                                         continue;
1959
1960                                                 case EntryType.Field:
1961                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
1962                                                                 continue;
1963                                                         break;
1964
1965                                                 case EntryType.Method:
1966                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
1967                                                                 continue;
1968                                                         break;
1969
1970                                                 case EntryType.Property:
1971                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
1972                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
1973                                                                 continue;
1974                                                         break;
1975
1976                                                 case EntryType.Event:
1977                                                         EventInfo ei = (EventInfo)member_entry.Member;
1978                                                         MethodInfo mi = ei.GetAddMethod ();
1979                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
1980                                                                 continue;
1981                                                         break;
1982                                         }
1983                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
1984                                         locase_table [lcase] = member_entry.Member;
1985                                         break;
1986                                 }
1987                         }
1988                         return locase_table;
1989                 }
1990
1991                 public Hashtable Members {
1992                         get {
1993                                 return member_hash;
1994                         }
1995                 }
1996
1997                 /// <summary>
1998                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
1999                 /// </summary>
2000                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2001                 {
2002                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2003
2004                         for (int i = 0; i < al.Count; ++i) {
2005                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2006
2007                                 // skip itself
2008                                 if (entry.Member == this_builder)
2009                                         continue;
2010
2011                                 if ((entry.EntryType & tested_type) != tested_type)
2012                                         continue;
2013
2014                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2015                                 if (AttributeTester.AreOverloadedMethodParamsClsCompliant (method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare)))
2016                                         continue;
2017
2018                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2019
2020                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2021                                 // However it is exactly what csc does.
2022                                 if (md != null && !md.IsClsCompliaceRequired (method.Parent))
2023                                         continue;
2024
2025                                 Report.SymbolRelatedToPreviousError (entry.Member);
2026                                 Report.Error (3006, method.Location, "Overloaded method '{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2027                         }
2028                 }
2029         }
2030 }