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 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                         : this (left, right.Name)
  48                 {
  49                 }
  50
  51                 public string GetName ()
  52                 {
  53                         return GetName (false);
  54                 }
  55
  56                 public string GetName (bool is_generic)
  57                 {
  58                         string name = is_generic ? Basename : Name;
  59                         if (Left != null)
  60                                 return Left.GetName (is_generic) + "." + name;
  61                         else
  62                                 return name;
  63                 }
  64
  65                 ///
  66                 /// This returns exclusively the name as seen on the source code
  67                 /// it is not the fully qualifed type after resolution
  68                 ///
  69                 public string GetPartialName ()
  70                 {
  71                         if (Left != null)
  72                                 return Left.GetPartialName () + "." + Name;
  73                         else
  74                                 return Name;
  75                 }
  76
  77                 public string GetTypeName ()
  78                 {
  79                         if (Left != null)
  80                                 return Left.GetTypeName () + "." + Name;
  81                         else
  82                                 return Name;
  83                 }
  84
  85                 public Expression GetTypeExpression (Location loc)
  86                 {
  87                         if (Left != null) {
  88                                 Expression lexpr = Left.GetTypeExpression (loc);
  89
  90                                 return new MemberAccess (lexpr, Name, loc);
  91                         } else {
  92                                 return new SimpleName (Name, loc);
  93                         }
  94                 }
  95
  96                 public MemberName Clone ()
  97                 {
  98                         if (Left != null)
  99                                 return new MemberName (Left.Clone (), Name);
 100                         else
 101                                 return new MemberName (Name);
 102                 }
 103
 104                 public string Basename {
 105                         get {
 106                                 return Name;
 107                         }
 108                 }
 109
 110                 public override string ToString ()
 111                 {
 112                         if (Left != null)
 113                                 return Left + "." + Name;
 114                         else
 115                                 return Name;
 116                 }
 117         }
 118
 119         /// <summary>
 120         ///   Base representation for members.  This is used to keep track
 121         ///   of Name, Location and Modifier flags, and handling Attributes.
 122         /// </summary>
 123         public abstract class MemberCore : Attributable {
 124                 /// <summary>
 125                 ///   Public name
 126                 /// </summary>
 127                 public string Name {
 128                         get {
 129                                 // !(this is GenericMethod) && !(this is Method)
 130                                 return MemberName.GetName (false);
 131                         }
 132                 }
 133
 134                 // Is not readonly because of IndexerName attribute
 135                 public MemberName MemberName;
 136
 137                 /// <summary>
 138                 ///   Modifier flags that the user specified in the source code
 139                 /// </summary>
 140                 public int ModFlags;
 141
 142                 public /*readonly*/ TypeContainer Parent;
 143
 144                 /// <summary>
 145                 ///   Location where this declaration happens
 146                 /// </summary>
 147                 public readonly Location Location;
 148
 149                 /// <summary>
 150                 ///   XML documentation comment
 151                 /// </summary>
 152                 public string DocComment;
 153
 154                 /// <summary>
 155                 ///   Represents header string for documentation comment
 156                 ///   for each member types.
 157                 /// </summary>
 158                 public abstract string DocCommentHeader { get; }
 159
 160                 [Flags]
 161                 public enum Flags {
 162                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 163                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 164                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 165                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 166                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 167                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 168                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 169                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 170                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 171                         Excluded = 1 << 9,                                      // Method is conditional
 172                         TestMethodDuplication = 1 << 10         // Test for duplication must be performed
 173                 }
 174
 175                 /// <summary>
 176                 ///   MemberCore flags at first detected then cached
 177                 /// </summary>
 178                 internal Flags caching_flags;
 179
 180                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs,
 181                                    Location loc)
 182                         : base (attrs)
 183                 {
 184                         Parent = parent;
 185                         MemberName = name;
 186                         Location = loc;
 187                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 188                 }
 189
 190                 /// <summary>
 191                 /// Tests presence of ObsoleteAttribute and report proper error
 192                 /// </summary>
 193                 protected void CheckUsageOfObsoleteAttribute (Type type)
 194                 {
 195                         if (type == null)
 196                                 return;
 197
 198                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
 199                         if (obsolete_attr == null)
 200                                 return;
 201
 202                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
 203                 }
 204
 205                 public abstract bool Define ();
 206
 207                 //
 208                 // Returns full member name for error message
 209                 //
 210                 public virtual string GetSignatureForError ()
 211                 {
 212                         return Name;
 213                 }
 214
 215                 /// <summary>
 216                 /// Use this method when MethodBuilder is null
 217                 /// </summary>
 218                 public virtual string GetSignatureForError (TypeContainer tc)
 219                 {
 220                         return Name;
 221                 }
 222
 223                 /// <summary>
 224                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 225                 /// </summary>
 226                 public virtual void Emit ()
 227                 {
 228                         // Hack with Parent == null is for EnumMember
 229                         if (Parent == null || (GetObsoleteAttribute (Parent) == null && Parent.GetObsoleteAttribute (Parent) == null))
 230                                 VerifyObsoleteAttribute ();
 231
 232                         if (!RootContext.VerifyClsCompliance)
 233                                 return;
 234
 235                         VerifyClsCompliance (Parent);
 236                 }
 237
 238                 public bool InUnsafe {
 239                         get {
 240                                 return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
 241                         }
 242                 }
 243
 244                 //
 245                 // Whehter is it ok to use an unsafe pointer in this type container
 246                 //
 247                 public bool UnsafeOK (DeclSpace parent)
 248                 {
 249                         //
 250                         // First check if this MemberCore modifier flags has unsafe set
 251                         //
 252                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 253                                 return true;
 254
 255                         if (parent.UnsafeContext)
 256                                 return true;
 257
 258                         Expression.UnsafeError (Location);
 259                         return false;
 260                 }
 261
 262                 /// <summary>
 263                 /// Returns instance of ObsoleteAttribute for this MemberCore
 264                 /// </summary>
 265                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 266                 {
 267                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 268                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 269                                 return null;
 270                         }
 271
 272                         caching_flags &= ~Flags.Obsolete_Undetected;
 273
 274                         if (OptAttributes == null)
 275                                 return null;
 276
 277                         Attribute obsolete_attr = OptAttributes.Search (
 278                                 TypeManager.obsolete_attribute_type, ds.EmitContext);
 279                         if (obsolete_attr == null)
 280                                 return null;
 281
 282                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds.EmitContext);
 283                         if (obsolete == null)
 284                                 return null;
 285
 286                         caching_flags |= Flags.Obsolete;
 287                         return obsolete;
 288                 }
 289
 290                 /// <summary>
 291                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 292                 /// </summary>
 293                 public override bool IsClsCompliaceRequired (DeclSpace container)
 294                 {
 295                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 296                                 return (caching_flags & Flags.ClsCompliant) != 0;
 297
 298                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 299                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 300                                 caching_flags |= Flags.ClsCompliant;
 301                                 return true;
 302                         }
 303
 304                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 305                         return false;
 306                 }
 307
 308                 /// <summary>
 309                 /// Returns true when MemberCore is exposed from assembly.
 310                 /// </summary>
 311                 public bool IsExposedFromAssembly (DeclSpace ds)
 312                 {
 313                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 314                                 return false;
 315
 316                         DeclSpace parentContainer = ds;
 317                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 318                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 319                                         return false;
 320                                 parentContainer = parentContainer.Parent;
 321                         }
 322                         return true;
 323                 }
 324
 325                 /// <summary>
 326                 /// Resolve CLSCompliantAttribute value or gets cached value.
 327                 /// </summary>
 328                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 329                 {
 330                         if (OptAttributes != null) {
 331                                 Attribute cls_attribute = OptAttributes.Search (
 332                                         TypeManager.cls_compliant_attribute_type, ds.EmitContext);
 333                                 if (cls_attribute != null) {
 334                                         caching_flags |= Flags.HasClsCompliantAttribute;
 335                                         return cls_attribute.GetClsCompliantAttributeValue (ds.EmitContext);
 336                                 }
 337                         }
 338                         return ds.GetClsCompliantAttributeValue ();
 339                 }
 340
 341                 /// <summary>
 342                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 343                 /// </summary>
 344                 protected bool HasClsCompliantAttribute {
 345                         get {
 346                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 347                         }
 348                 }
 349
 350                 /// <summary>
 351                 /// It helps to handle error 102 & 111 detection
 352                 /// </summary>
 353                 public virtual bool MarkForDuplicationCheck ()
 354                 {
 355                         return false;
 356                 }
 357
 358                 /// <summary>
 359                 /// The main virtual method for CLS-Compliant verifications.
 360                 /// The method returns true if member is CLS-Compliant and false if member is not
 361                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 362                 /// and add their extra verifications.
 363                 /// </summary>
 364                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 365                 {
 366                         if (!IsClsCompliaceRequired (ds)) {
 367                                 if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
 368                                         if (!IsExposedFromAssembly (ds))
 369                                                 Report.Warning (3019, Location, "CLS compliance checking will not be performed on '{0}' because it is private or internal", GetSignatureForError ());
 370                                         if (!CodeGen.Assembly.IsClsCompliant)
 371                                                 Report.Warning (3021, Location, "'{0}' does not need a CLSCompliant attribute because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 372                                 }
 373                                 return false;
 374                         }
 375
 376                         if (!CodeGen.Assembly.IsClsCompliant) {
 377                                 if (HasClsCompliantAttribute) {
 378                                         Report.Error (3014, Location, "'{0}' cannot be marked as CLS-compliant because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 379                                 }
 380                                 return false;
 381                         }
 382
 383                         int index = Name.LastIndexOf ('.');
 384                         if (Name [index > 0 ? index + 1 : 0] == '_') {
 385                                 Report.Error (3008, Location, "Identifier '{0}' is not CLS-compliant", GetSignatureForError () );
 386                         }
 387                         return true;
 388                 }
 389
 390                 protected abstract void VerifyObsoleteAttribute ();
 391
 392                 //
 393                 // Raised (and passed an XmlElement that contains the comment)
 394                 // when GenerateDocComment is writing documentation expectedly.
 395                 //
 396                 internal virtual void OnGenerateDocComment (DeclSpace ds, XmlElement intermediateNode)
 397                 {
 398                 }
 399
 400                 //
 401                 // Returns a string that represents the signature for this
 402                 // member which should be used in XML documentation.
 403                 //
 404                 public virtual string GetDocCommentName (DeclSpace ds)
 405                 {
 406                         if (ds == null || this is DeclSpace)
 407                                 return DocCommentHeader + Name;
 408                         else
 409                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 410                 }
 411
 412                 //
 413                 // Generates xml doc comments (if any), and if required,
 414                 // handle warning report.
 415                 //
 416                 internal virtual void GenerateDocComment (DeclSpace ds)
 417                 {
 418                         DocUtil.GenerateDocComment (this, ds);
 419                 }
 420         }
 421
 422         /// <summary>
 423         ///   Base class for structs, classes, enumerations and interfaces.
 424         /// </summary>
 425         /// <remarks>
 426         ///   They all create new declaration spaces.  This
 427         ///   provides the common foundation for managing those name
 428         ///   spaces.
 429         /// </remarks>
 430         public abstract class DeclSpace : MemberCore, IAlias {
 431                 /// <summary>
 432                 ///   This points to the actual definition that is being
 433                 ///   created with System.Reflection.Emit
 434                 /// </summary>
 435                 public TypeBuilder TypeBuilder;
 436
 437                 //
 438                 // This is the namespace in which this typecontainer
 439                 // was declared.  We use this to resolve names.
 440                 //
 441                 public NamespaceEntry NamespaceEntry;
 442
 443                 private Hashtable Cache = new Hashtable ();
 444
 445                 public string Basename;
 446
 447                 protected Hashtable defined_names;
 448
 449                 // The emit context for toplevel objects.
 450                 protected EmitContext ec;
 451
 452                 public EmitContext EmitContext {
 453                         get { return ec; }
 454                 }
 455
 456                 static string[] attribute_targets = new string [] { "type" };
 457
 458                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 459                                   Attributes attrs, Location l)
 460                         : base (parent, name, attrs, l)
 461                 {
 462                         NamespaceEntry = ns;
 463                         Basename = name.Name;
 464                         defined_names = new Hashtable ();
 465                 }
 466
 467                 /// <summary>
 468                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 469                 /// </summary>
 470                 protected bool AddToContainer (MemberCore symbol, string fullname, string basename)
 471                 {
 472                         if (basename == Basename && !(this is Interface)) {
 473                                 Report.SymbolRelatedToPreviousError (this);
 474                                 Report.Error (542,  symbol.Location, "'{0}': member names cannot be the same as their enclosing type", symbol.GetSignatureForError ());
 475                                 return false;
 476                         }
 477
 478                         MemberCore mc = (MemberCore)defined_names [fullname];
 479
 480                         if (mc == null) {
 481                                 defined_names.Add (fullname, symbol);
 482                                 return true;
 483                         }
 484
 485                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 486                                 return true;
 487
 488                         Report.SymbolRelatedToPreviousError (mc);
 489                         Report.Error (102, symbol.Location, "The type '{0}' already contains a definition for '{1}'", GetSignatureForError (), basename);
 490                         return false;
 491                 }
 492
 493                 public void RecordDecl ()
 494                 {
 495                         if ((NamespaceEntry != null) && (Parent == RootContext.Tree.Types))
 496                                 NamespaceEntry.DefineName (MemberName.Basename, this);
 497                 }
 498
 499                 /// <summary>
 500                 ///   Returns the MemberCore associated with a given name in the declaration
 501                 ///   space. It doesn't return method based symbols !!
 502                 /// </summary>
 503                 ///
 504                 public MemberCore GetDefinition (string name)
 505                 {
 506                         return (MemberCore)defined_names [name];
 507                 }
 508
 509                 bool in_transit = false;
 510
 511                 /// <summary>
 512                 ///   This function is used to catch recursive definitions
 513                 ///   in declarations.
 514                 /// </summary>
 515                 public bool InTransit {
 516                         get {
 517                                 return in_transit;
 518                         }
 519
 520                         set {
 521                                 in_transit = value;
 522                         }
 523                 }
 524
 525                 //
 526                 // root_types contains all the types.  All TopLevel types
 527                 // hence have a parent that points to `root_types', that is
 528                 // why there is a non-obvious test down here.
 529                 //
 530                 public bool IsTopLevel {
 531                         get {
 532                                 if (Parent != null){
 533                                         if (Parent.Parent == null)
 534                                                 return true;
 535                                 }
 536                                 return false;
 537                         }
 538                 }
 539
 540                 public virtual void CloseType ()
 541                 {
 542                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 543                                 try {
 544                                         TypeBuilder.CreateType ();
 545                                 } catch {
 546                                         //
 547                                         // The try/catch is needed because
 548                                         // nested enumerations fail to load when they
 549                                         // are defined.
 550                                         //
 551                                         // Even if this is the right order (enumerations
 552                                         // declared after types).
 553                                         //
 554                                         // Note that this still creates the type and
 555                                         // it is possible to save it
 556                                 }
 557                                 caching_flags |= Flags.CloseTypeCreated;
 558                         }
 559                 }
 560
 561                 /// <remarks>
 562                 ///  Should be overriten by the appropriate declaration space
 563                 /// </remarks>
 564                 public abstract TypeBuilder DefineType ();
 565
 566                 /// <summary>
 567                 ///   Define all members, but don't apply any attributes or do anything which may
 568                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 569                 /// </summary>
 570                 public abstract bool DefineMembers (TypeContainer parent);
 571
 572                 //
 573                 // Whether this is an `unsafe context'
 574                 //
 575                 public bool UnsafeContext {
 576                         get {
 577                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 578                                         return true;
 579                                 if (Parent != null)
 580                                         return Parent.UnsafeContext;
 581                                 return false;
 582                         }
 583                 }
 584
 585                 public static string MakeFQN (string nsn, string name)
 586                 {
 587                         if (nsn == "")
 588                                 return name;
 589                         return String.Concat (nsn, ".", name);
 590                 }
 591
 592                 EmitContext type_resolve_ec;
 593
 594                 // <summary>
 595                 //    Resolves the expression `e' for a type, and will recursively define
 596                 //    types.  This should only be used for resolving base types.
 597                 // </summary>
 598                 public TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
 599                 {
 600                         if (type_resolve_ec == null) {
 601                                 // FIXME: I think this should really be one of:
 602                                 //
 603                                 // a. type_resolve_ec = Parent.EmitContext;
 604                                 // b. type_resolve_ec = new EmitContext (Parent, Parent, loc, null, null, ModFlags, false);
 605                                 //
 606                                 // However, if Parent == RootContext.Tree.Types, its NamespaceEntry will be null.
 607                                 //
 608                                 type_resolve_ec = new EmitContext (Parent, this, loc, null, null, ModFlags, false);
 609                                 type_resolve_ec.ResolvingTypeTree = true;
 610                         }
 611                         type_resolve_ec.loc = loc;
 612                         type_resolve_ec.ContainerType = TypeBuilder;
 613
 614                         return e.ResolveAsTypeTerminal (type_resolve_ec, silent);
 615                 }
 616
 617                 public bool CheckAccessLevel (Type check_type)
 618                 {
 619                         if (check_type == TypeBuilder)
 620                                 return true;
 621
 622                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 623
 624                         //
 625                         // Broken Microsoft runtime, return public for arrays, no matter what
 626                         // the accessibility is for their underlying class, and they return
 627                         // NonPublic visibility for pointers
 628                         //
 629                         if (check_type.IsArray || check_type.IsPointer)
 630                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 631
 632                         if (TypeBuilder == null)
 633                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 634                                 //        However, this is invoked again later -- so safe to return true.
 635                                 //        May also be null when resolving top-level attributes.
 636                                 return true;
 637
 638                         switch (check_attr){
 639                         case TypeAttributes.Public:
 640                                 return true;
 641
 642                         case TypeAttributes.NotPublic:
 643                                 //
 644                                 // This test should probably use the declaringtype.
 645                                 //
 646                                 return check_type.Assembly == TypeBuilder.Assembly;
 647
 648                         case TypeAttributes.NestedPublic:
 649                                 return true;
 650
 651                         case TypeAttributes.NestedPrivate:
 652                                 return NestedAccessible (check_type);
 653
 654                         case TypeAttributes.NestedFamily:
 655                                 return FamilyAccessible (check_type);
 656
 657                         case TypeAttributes.NestedFamANDAssem:
 658                                 return (check_type.Assembly == TypeBuilder.Assembly) &&
 659                                         FamilyAccessible (check_type);
 660
 661                         case TypeAttributes.NestedFamORAssem:
 662                                 return (check_type.Assembly == TypeBuilder.Assembly) ||
 663                                         FamilyAccessible (check_type);
 664
 665                         case TypeAttributes.NestedAssembly:
 666                                 return check_type.Assembly == TypeBuilder.Assembly;
 667                         }
 668
 669                         Console.WriteLine ("HERE: " + check_attr);
 670                         return false;
 671
 672                 }
 673
 674                 protected bool NestedAccessible (Type check_type)
 675                 {
 676                         string check_type_name = check_type.FullName;
 677
 678                         // At this point, we already know check_type is a nested class.
 679                         int cio = check_type_name.LastIndexOf ('+');
 680
 681                         // Ensure that the string 'container' has a '+' in it to avoid false matches
 682                         string container = check_type_name.Substring (0, cio + 1);
 683
 684                         // Ensure that type_name ends with a '+' so that it can match 'container', if necessary
 685                         string type_name = TypeBuilder.FullName + "+";
 686
 687                         // If the current class is nested inside the container of check_type,
 688                         // we can access check_type even if it is private or protected.
 689                         return type_name.StartsWith (container);
 690                 }
 691
 692                 protected bool FamilyAccessible (Type check_type)
 693                 {
 694                         Type declaring = check_type.DeclaringType;
 695                         if (TypeBuilder == declaring ||
 696                             TypeBuilder.IsSubclassOf (declaring))
 697                                 return true;
 698
 699                         return NestedAccessible (check_type);
 700                 }
 701
 702                 // Access level of a type.
 703                 const int X = 1;
 704                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 705                                             // Public    Assembly   Protected
 706                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 707                         Public              = (X << 0) | (X << 1) | (X << 2),
 708                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 709                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 710                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 711                 }
 712
 713                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 714                 {
 715                         if ((flags & Modifiers.INTERNAL) != 0) {
 716
 717                                 if ((flags & Modifiers.PROTECTED) != 0)
 718                                         return AccessLevel.ProtectedOrInternal;
 719                                 else
 720                                         return AccessLevel.Internal;
 721
 722                         } else if ((flags & Modifiers.PROTECTED) != 0)
 723                                 return AccessLevel.Protected;
 724
 725                         else if ((flags & Modifiers.PRIVATE) != 0)
 726                                 return AccessLevel.Private;
 727
 728                         else
 729                                 return AccessLevel.Public;
 730                 }
 731
 732                 // What is the effective access level of this?
 733                 // TODO: Cache this?
 734                 AccessLevel EffectiveAccessLevel {
 735                         get {
 736                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 737                                 if (!IsTopLevel && (Parent != null))
 738                                         return myAccess & Parent.EffectiveAccessLevel;
 739                                 else
 740                                         return myAccess;
 741                         }
 742                 }
 743
 744                 // Return the access level for type `t'
 745                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 746                 {
 747                         if (t.IsPublic)
 748                                 return AccessLevel.Public;
 749                         if (t.IsNestedPrivate)
 750                                 return AccessLevel.Private;
 751                         if (t.IsNotPublic)
 752                                 return AccessLevel.Internal;
 753
 754                         // By now, it must be nested
 755                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
 756
 757                         if (t.IsNestedPublic)
 758                                 return parentLevel;
 759                         if (t.IsNestedAssembly)
 760                                 return parentLevel & AccessLevel.Internal;
 761                         if (t.IsNestedFamily)
 762                                 return parentLevel & AccessLevel.Protected;
 763                         if (t.IsNestedFamORAssem)
 764                                 return parentLevel & AccessLevel.ProtectedOrInternal;
 765                         if (t.IsNestedFamANDAssem)
 766                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 767
 768                         // nested private is taken care of
 769
 770                         throw new Exception ("I give up, what are you?");
 771                 }
 772
 773                 //
 774                 // This answers `is the type P, as accessible as a member M which has the
 775                 // accessability @flags which is declared as a nested member of the type T, this declspace'
 776                 //
 777                 public bool AsAccessible (Type p, int flags)
 778                 {
 779                         //
 780                         // 1) if M is private, its accessability is the same as this declspace.
 781                         // we already know that P is accessible to T before this method, so we
 782                         // may return true.
 783                         //
 784
 785                         if ((flags & Modifiers.PRIVATE) != 0)
 786                                 return true;
 787
 788                         while (p.IsArray || p.IsPointer || p.IsByRef)
 789                                 p = TypeManager.GetElementType (p);
 790
 791                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
 792                         AccessLevel mAccess = this.EffectiveAccessLevel &
 793                                 GetAccessLevelFromModifiers (flags);
 794
 795                         // for every place from which we can access M, we must
 796                         // be able to access P as well. So, we want
 797                         // For every bit in M and P, M_i -> P_1 == true
 798                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
 799
 800                         return ~ (~ mAccess | pAccess) == 0;
 801                 }
 802
 803                 static DoubleHash dh = new DoubleHash (1000);
 804
 805                 Type DefineTypeAndParents (DeclSpace tc)
 806                 {
 807                         DeclSpace container = tc.Parent;
 808
 809                         if (container.TypeBuilder == null && container.Name != "")
 810                                 DefineTypeAndParents (container);
 811
 812                         return tc.DefineType ();
 813                 }
 814
 815                 FullNamedExpression LookupInterfaceOrClass (string ns, string name, out bool error)
 816                 {
 817                         DeclSpace parent;
 818                         FullNamedExpression result;
 819                         Type t;
 820                         object r;
 821
 822                         error = false;
 823                         int p = name.LastIndexOf ('.');
 824
 825                         if (dh.Lookup (ns, name, out r))
 826                                 return (FullNamedExpression) r;
 827                         else {
 828                                 //
 829                                 // If the type is not a nested type, we do not need `LookupType's processing.
 830                                 // If the @name does not have a `.' in it, this cant be a nested type.
 831                                 //
 832                                 if (ns != ""){
 833                                         if (Namespace.IsNamespace (ns)) {
 834                                                 if (p != -1)
 835                                                         t = TypeManager.LookupType (ns + "." + name);
 836                                                 else
 837                                                         t = TypeManager.LookupTypeDirect (ns + "." + name);
 838                                         } else
 839                                                 t = null;
 840                                 } else if (p != -1)
 841                                         t = TypeManager.LookupType (name);
 842                                 else
 843                                         t = TypeManager.LookupTypeDirect (name);
 844                         }
 845
 846                         if (t != null) {
 847                                 result = new TypeExpression (t, Location.Null);
 848                                 dh.Insert (ns, name, result);
 849                                 return result;
 850                         }
 851
 852                         if (ns != "" && Namespace.IsNamespace (ns)) {
 853                                 result = Namespace.LookupNamespace (ns, false).Lookup (this, name, Location.Null);
 854                                 if (result != null) {
 855                                         dh.Insert (ns, name, result);
 856                                         return result;
 857                                 }
 858                         }
 859
 860                         if (ns == "" && Namespace.IsNamespace (name)) {
 861                                 result = Namespace.LookupNamespace (name, false);
 862                                 dh.Insert (ns, name, result);
 863                                 return result;
 864                         }
 865
 866                         //
 867                         // In case we are fed a composite name, normalize it.
 868                         //
 869
 870                         if (p != -1){
 871                                 ns = MakeFQN (ns, name.Substring (0, p));
 872                                 name = name.Substring (p+1);
 873                         }
 874
 875                         if (ns.IndexOf ('+') != -1)
 876                                 ns = ns.Replace ('+', '.');
 877
 878                         parent = RootContext.Tree.LookupByNamespace (ns, name);
 879                         if (parent == null) {
 880                                 dh.Insert (ns, name, null);
 881                                 return null;
 882                         }
 883
 884                         t = DefineTypeAndParents (parent);
 885                         if (t == null){
 886                                 error = true;
 887                                 return null;
 888                         }
 889
 890                         result = new TypeExpression (t, Location.Null);
 891                         dh.Insert (ns, name, result);
 892                         return result;
 893                 }
 894
 895                 public static void Error_AmbiguousTypeReference (Location loc, string name, string t1, string t2)
 896                 {
 897                         Report.Error (104, loc,
 898                                       "`{0}' is an ambiguous reference ({1} or {2})",
 899                                       name, t1, t2);
 900                 }
 901
 902                 /// <summary>
 903                 ///   GetType is used to resolve type names at the DeclSpace level.
 904                 ///   Use this to lookup class/struct bases, interface bases or
 905                 ///   delegate type references
 906                 /// </summary>
 907                 ///
 908                 /// <remarks>
 909                 ///   Contrast this to LookupType which is used inside method bodies to
 910                 ///   lookup types that have already been defined.  GetType is used
 911                 ///   during the tree resolution process and potentially define
 912                 ///   recursively the type
 913                 /// </remarks>
 914                 public FullNamedExpression FindType (Location loc, string name)
 915                 {
 916                         FullNamedExpression t;
 917                         bool error;
 918
 919                         //
 920                         // For the case the type we are looking for is nested within this one
 921                         // or is in any base class
 922                         //
 923
 924                         DeclSpace containing_ds = this;
 925
 926                         while (containing_ds != null){
 927                                 Type container_type = containing_ds.TypeBuilder;
 928                                 Type current_type = container_type;
 929
 930                                 while (current_type != null && current_type != TypeManager.object_type) {
 931                                         string pre = current_type.FullName;
 932
 933                                         t = LookupInterfaceOrClass (pre, name, out error);
 934                                         if (error)
 935                                                 return null;
 936
 937                                         if ((t != null) && containing_ds.CheckAccessLevel (t.Type))
 938                                                 return t;
 939
 940                                         current_type = current_type.BaseType;
 941                                 }
 942                                 containing_ds = containing_ds.Parent;
 943                         }
 944
 945                         //
 946                         // Attempt to lookup the class on our namespace and all it's implicit parents
 947                         //
 948                         for (NamespaceEntry ns = NamespaceEntry; ns != null; ns = ns.ImplicitParent) {
 949                                 t = LookupInterfaceOrClass (ns.FullName, name, out error);
 950                                 if (error)
 951                                         return null;
 952
 953                                 if (t != null)
 954                                         return t;
 955                         }
 956
 957                         //
 958                         // Attempt to do a direct unqualified lookup
 959                         //
 960                         t = LookupInterfaceOrClass ("", name, out error);
 961                         if (error)
 962                                 return null;
 963
 964                         if (t != null)
 965                                 return t;
 966
 967                         //
 968                         // Attempt to lookup the class on any of the `using'
 969                         // namespaces
 970                         //
 971
 972                         for (NamespaceEntry ns = NamespaceEntry; ns != null; ns = ns.Parent){
 973
 974                                 t = LookupInterfaceOrClass (ns.FullName, name, out error);
 975                                 if (error)
 976                                         return null;
 977
 978                                 if (t != null)
 979                                         return t;
 980
 981                                 if (name.IndexOf ('.') > 0)
 982                                         continue;
 983
 984                                 t = ns.LookupAlias (name);
 985                                 if (t != null)
 986                                         return t;
 987
 988                                 //
 989                                 // Now check the using clause list
 990                                 //
 991                                 FullNamedExpression match = null;
 992                                 foreach (Namespace using_ns in ns.GetUsingTable ()) {
 993                                         match = LookupInterfaceOrClass (using_ns.Name, name, out error);
 994                                         if (error)
 995                                                 return null;
 996
 997                                         if ((match != null) && (match is TypeExpr)) {
 998                                                 Type matched = ((TypeExpr) match).Type;
 999                                                 if (!CheckAccessLevel (matched))
1000                                                         continue;
1001                                                 if (t != null){
1002                                                         Error_AmbiguousTypeReference (loc, name, t.FullName, match.FullName);
1003                                                         return null;
1004                                                 }
1005                                                 t = match;
1006                                         }
1007                                 }
1008                                 if (t != null)
1009                                         return t;
1010                         }
1011
1012                         //Report.Error (246, Location, "Can not find type `"+name+"'");
1013                         return null;
1014                 }
1015
1016                 //
1017                 // Public function used to locate types, this can only
1018                 // be used after the ResolveTree function has been invoked.
1019                 //
1020                 // Returns: Type or null if they type can not be found.
1021                 //
1022                 // Come to think of it, this should be a DeclSpace
1023                 //
1024                 public FullNamedExpression LookupType (string name, bool silent, Location loc)
1025                 {
1026                         FullNamedExpression e;
1027
1028                         if (Cache.Contains (name)) {
1029                                 e = (FullNamedExpression) Cache [name];
1030                         } else {
1031                                 //
1032                                 // For the case the type we are looking for is nested within this one
1033                                 // or is in any base class
1034                                 //
1035                                 DeclSpace containing_ds = this;
1036                                 while (containing_ds != null){
1037
1038                                         // if the member cache has been created, lets use it.
1039                                         // the member cache is MUCH faster.
1040                                         if (containing_ds.MemberCache != null) {
1041                                                 Type t = containing_ds.MemberCache.FindNestedType (name);
1042                                                 if (t == null) {
1043                                                         containing_ds = containing_ds.Parent;
1044                                                         continue;
1045                                                 }
1046
1047                                                 e = new TypeExpression (t, Location.Null);
1048                                                 Cache [name] = e;
1049                                                 return e;
1050                                         }
1051
1052                                         // no member cache. Do it the hard way -- reflection
1053                                         Type current_type = containing_ds.TypeBuilder;
1054
1055                                         while (current_type != null &&
1056                                                current_type != TypeManager.object_type) {
1057                                                 //
1058                                                 // nested class
1059                                                 //
1060                                                 Type t = TypeManager.LookupType (current_type.FullName + "." + name);
1061                                                 if (t != null){
1062                                                         e = new TypeExpression (t, Location.Null);
1063                                                         Cache [name] = e;
1064                                                         return e;
1065                                                 }
1066
1067                                                 current_type = current_type.BaseType;
1068                                         }
1069
1070                                         containing_ds = containing_ds.Parent;
1071                                 }
1072
1073                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc);
1074                                 if (!silent || e != null)
1075                                         Cache [name] = e;
1076                         }
1077
1078                         if (e == null && !silent)
1079                                 Report.Error (246, loc, "Cannot find type `"+name+"'");
1080
1081                         return e;
1082                 }
1083
1084                 /// <remarks>
1085                 ///   This function is broken and not what you're looking for.  It should only
1086                 ///   be used while the type is still being created since it doesn't use the cache
1087                 ///   and relies on the filter doing the member name check.
1088                 /// </remarks>
1089                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1090                                                         MemberFilter filter, object criteria);
1091
1092                 /// <remarks>
1093                 ///   If we have a MemberCache, return it.  This property may return null if the
1094                 ///   class doesn't have a member cache or while it's still being created.
1095                 /// </remarks>
1096                 public abstract MemberCache MemberCache {
1097                         get;
1098                 }
1099
1100                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1101                 {
1102                         try {
1103                                 TypeBuilder.SetCustomAttribute (cb);
1104                         } catch (System.ArgumentException e) {
1105                                 Report.Warning (-21, a.Location,
1106                                                 "The CharSet named property on StructLayout\n"+
1107                                                 "\tdoes not work correctly on Microsoft.NET\n"+
1108                                                 "\tYou might want to remove the CharSet declaration\n"+
1109                                                 "\tor compile using the Mono runtime instead of the\n"+
1110                                                 "\tMicrosoft .NET runtime\n"+
1111                                                 "\tThe runtime gave the error: " + e);
1112                         }
1113                 }
1114
1115                 /// <summary>
1116                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
1117                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
1118                 /// </summary>
1119                 public bool GetClsCompliantAttributeValue ()
1120                 {
1121                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
1122                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
1123
1124                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
1125
1126                         if (OptAttributes != null) {
1127                                 Attribute cls_attribute = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, ec);
1128                                 if (cls_attribute != null) {
1129                                         caching_flags |= Flags.HasClsCompliantAttribute;
1130                                         if (cls_attribute.GetClsCompliantAttributeValue (ec)) {
1131                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1132                                                 return true;
1133                                         }
1134                                         return false;
1135                                 }
1136                         }
1137
1138                         if (Parent == null) {
1139                                 if (CodeGen.Assembly.IsClsCompliant) {
1140                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
1141                                         return true;
1142                                 }
1143                                 return false;
1144                         }
1145
1146                         if (Parent.GetClsCompliantAttributeValue ()) {
1147                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1148                                 return true;
1149                         }
1150                         return false;
1151                 }
1152
1153                 public override string[] ValidAttributeTargets {
1154                         get {
1155                                 return attribute_targets;
1156                         }
1157                 }
1158
1159                 bool IAlias.IsType {
1160                         get { return true; }
1161                 }
1162
1163                 string IAlias.Name {
1164                         get { return Name; }
1165                 }
1166
1167                 TypeExpr IAlias.ResolveAsType (EmitContext ec)
1168                 {
1169                         if (TypeBuilder == null)
1170                                 throw new InvalidOperationException ();
1171
1172                         return new TypeExpression (TypeBuilder, Location);
1173                 }
1174         }
1175
1176         /// <summary>
1177         ///   This is a readonly list of MemberInfo's.
1178         /// </summary>
1179         public class MemberList : IList {
1180                 public readonly IList List;
1181                 int count;
1182
1183                 /// <summary>
1184                 ///   Create a new MemberList from the given IList.
1185                 /// </summary>
1186                 public MemberList (IList list)
1187                 {
1188                         if (list != null)
1189                                 this.List = list;
1190                         else
1191                                 this.List = new ArrayList ();
1192                         count = List.Count;
1193                 }
1194
1195                 /// <summary>
1196                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1197                 /// </summary>
1198                 public MemberList (IList first, IList second)
1199                 {
1200                         ArrayList list = new ArrayList ();
1201                         list.AddRange (first);
1202                         list.AddRange (second);
1203                         count = list.Count;
1204                         List = list;
1205                 }
1206
1207                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1208
1209                 /// <summary>
1210                 ///   Cast the MemberList into a MemberInfo[] array.
1211                 /// </summary>
1212                 /// <remarks>
1213                 ///   This is an expensive operation, only use it if it's really necessary.
1214                 /// </remarks>
1215                 public static explicit operator MemberInfo [] (MemberList list)
1216                 {
1217                         Timer.StartTimer (TimerType.MiscTimer);
1218                         MemberInfo [] result = new MemberInfo [list.Count];
1219                         list.CopyTo (result, 0);
1220                         Timer.StopTimer (TimerType.MiscTimer);
1221                         return result;
1222                 }
1223
1224                 // ICollection
1225
1226                 public int Count {
1227                         get {
1228                                 return count;
1229                         }
1230                 }
1231
1232                 public bool IsSynchronized {
1233                         get {
1234                                 return List.IsSynchronized;
1235                         }
1236                 }
1237
1238                 public object SyncRoot {
1239                         get {
1240                                 return List.SyncRoot;
1241                         }
1242                 }
1243
1244                 public void CopyTo (Array array, int index)
1245                 {
1246                         List.CopyTo (array, index);
1247                 }
1248
1249                 // IEnumerable
1250
1251                 public IEnumerator GetEnumerator ()
1252                 {
1253                         return List.GetEnumerator ();
1254                 }
1255
1256                 // IList
1257
1258                 public bool IsFixedSize {
1259                         get {
1260                                 return true;
1261                         }
1262                 }
1263
1264                 public bool IsReadOnly {
1265                         get {
1266                                 return true;
1267                         }
1268                 }
1269
1270                 object IList.this [int index] {
1271                         get {
1272                                 return List [index];
1273                         }
1274
1275                         set {
1276                                 throw new NotSupportedException ();
1277                         }
1278                 }
1279
1280                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1281                 public MemberInfo this [int index] {
1282                         get {
1283                                 return (MemberInfo) List [index];
1284                         }
1285                 }
1286
1287                 public int Add (object value)
1288                 {
1289                         throw new NotSupportedException ();
1290                 }
1291
1292                 public void Clear ()
1293                 {
1294                         throw new NotSupportedException ();
1295                 }
1296
1297                 public bool Contains (object value)
1298                 {
1299                         return List.Contains (value);
1300                 }
1301
1302                 public int IndexOf (object value)
1303                 {
1304                         return List.IndexOf (value);
1305                 }
1306
1307                 public void Insert (int index, object value)
1308                 {
1309                         throw new NotSupportedException ();
1310                 }
1311
1312                 public void Remove (object value)
1313                 {
1314                         throw new NotSupportedException ();
1315                 }
1316
1317                 public void RemoveAt (int index)
1318                 {
1319                         throw new NotSupportedException ();
1320                 }
1321         }
1322
1323         /// <summary>
1324         ///   This interface is used to get all members of a class when creating the
1325         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1326         ///   want to support the member cache and by TypeHandle to get caching of
1327         ///   non-dynamic types.
1328         /// </summary>
1329         public interface IMemberContainer {
1330                 /// <summary>
1331                 ///   The name of the IMemberContainer.  This is only used for
1332                 ///   debugging purposes.
1333                 /// </summary>
1334                 string Name {
1335                         get;
1336                 }
1337
1338                 /// <summary>
1339                 ///   The type of this IMemberContainer.
1340                 /// </summary>
1341                 Type Type {
1342                         get;
1343                 }
1344
1345                 /// <summary>
1346                 ///   Returns the IMemberContainer of the base class or null if this
1347                 ///   is an interface or TypeManger.object_type.
1348                 ///   This is used when creating the member cache for a class to get all
1349                 ///   members from the base class.
1350                 /// </summary>
1351                 MemberCache BaseCache {
1352                         get;
1353                 }
1354
1355                 /// <summary>
1356                 ///   Whether this is an interface.
1357                 /// </summary>
1358                 bool IsInterface {
1359                         get;
1360                 }
1361
1362                 /// <summary>
1363                 ///   Returns all members of this class with the corresponding MemberTypes
1364                 ///   and BindingFlags.
1365                 /// </summary>
1366                 /// <remarks>
1367                 ///   When implementing this method, make sure not to return any inherited
1368                 ///   members and check the MemberTypes and BindingFlags properly.
1369                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1370                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1371                 ///   MemberInfo class, but the cache needs this information.  That's why
1372                 ///   this method is called multiple times with different BindingFlags.
1373                 /// </remarks>
1374                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1375
1376                 /// <summary>
1377                 ///   Return the container's member cache.
1378                 /// </summary>
1379                 MemberCache MemberCache {
1380                         get;
1381                 }
1382         }
1383
1384         /// <summary>
1385         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1386         ///   member lookups.  It has a member name based hash table; it maps each member
1387         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1388         ///   and the BindingFlags that were initially used to get it.  The cache contains
1389         ///   all members of the current class and all inherited members.  If this cache is
1390         ///   for an interface types, it also contains all inherited members.
1391         ///
1392         ///   There are two ways to get a MemberCache:
1393         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1394         ///     use the DeclSpace.MemberCache property.
1395         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1396         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1397         /// </summary>
1398         public class MemberCache {
1399                 public readonly IMemberContainer Container;
1400                 protected Hashtable member_hash;
1401                 protected Hashtable method_hash;
1402
1403                 /// <summary>
1404                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1405                 /// </summary>
1406                 public MemberCache (IMemberContainer container)
1407                 {
1408                         this.Container = container;
1409
1410                         Timer.IncrementCounter (CounterType.MemberCache);
1411                         Timer.StartTimer (TimerType.CacheInit);
1412
1413                         // If we have a base class (we have a base class unless we're
1414                         // TypeManager.object_type), we deep-copy its MemberCache here.
1415                         if (Container.BaseCache != null)
1416                                 member_hash = DeepCopy (Container.BaseCache.member_hash);
1417                         else
1418                                 member_hash = new Hashtable ();
1419
1420                         // If this is neither a dynamic type nor an interface, create a special
1421                         // method cache with all declared and inherited methods.
1422                         Type type = container.Type;
1423                         if (!(type is TypeBuilder) && !type.IsInterface) {
1424                                 if (Container.BaseCache != null) {
1425                                         method_hash = DeepCopy (Container.BaseCache.method_hash);
1426                                         ClearDeclaredOnly (method_hash);
1427                                 }
1428                                 else
1429                                         method_hash = new Hashtable ();
1430                                 AddMethods (type);
1431                         }
1432
1433                         // Add all members from the current class.
1434                         AddMembers (Container);
1435
1436                         Timer.StopTimer (TimerType.CacheInit);
1437                 }
1438
1439                 public MemberCache (Type[] ifaces)
1440                 {
1441                         //
1442                         // The members of this cache all belong to other caches.
1443                         // So, 'Container' will not be used.
1444                         //
1445                         this.Container = null;
1446
1447                         member_hash = new Hashtable ();
1448                         if (ifaces == null)
1449                                 return;
1450
1451                         foreach (Type itype in ifaces)
1452                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1453                 }
1454
1455                 /// <summary>
1456                 ///   Return a a deep-copy of the hashtable @other.
1457                 /// </summary>
1458                 Hashtable DeepCopy (Hashtable other)
1459                 {
1460                         Hashtable hash = new Hashtable ();
1461
1462                         if (other == null)
1463                                 return hash;
1464
1465                         IDictionaryEnumerator it = other.GetEnumerator ();
1466                         while (it.MoveNext ()) {
1467                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1468                          }
1469
1470                         return hash;
1471                 }
1472
1473                 void ClearDeclaredOnly (Hashtable hash)
1474                 {
1475                         IDictionaryEnumerator it = hash.GetEnumerator ();
1476                         while (it.MoveNext ()) {
1477                                 foreach (CacheEntry ce in (ArrayList) it.Value)
1478                                         ce.EntryType &= ~EntryType.Declared;
1479                         }
1480                 }
1481
1482                 /// <summary>
1483                 ///   Add the contents of `cache' to the member_hash.
1484                 /// </summary>
1485                 void AddCacheContents (MemberCache cache)
1486                 {
1487                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1488                         while (it.MoveNext ()) {
1489                                 ArrayList list = (ArrayList) member_hash [it.Key];
1490                                 if (list == null)
1491                                         member_hash [it.Key] = list = new ArrayList ();
1492
1493                                 ArrayList entries = (ArrayList) it.Value;
1494                                 for (int i = entries.Count-1; i >= 0; i--) {
1495                                         CacheEntry entry = (CacheEntry) entries [i];
1496
1497                                         if (entry.Container != cache.Container)
1498                                                 break;
1499                                         list.Add (entry);
1500                                 }
1501                         }
1502                 }
1503
1504                 /// <summary>
1505                 ///   Add all members from class `container' to the cache.
1506                 /// </summary>
1507                 void AddMembers (IMemberContainer container)
1508                 {
1509                         // We need to call AddMembers() with a single member type at a time
1510                         // to get the member type part of CacheEntry.EntryType right.
1511                         if (!container.IsInterface) {
1512                                 AddMembers (MemberTypes.Constructor, container);
1513                                 AddMembers (MemberTypes.Field, container);
1514                         }
1515                         AddMembers (MemberTypes.Method, container);
1516                         AddMembers (MemberTypes.Property, container);
1517                         AddMembers (MemberTypes.Event, container);
1518                         // Nested types are returned by both Static and Instance searches.
1519                         AddMembers (MemberTypes.NestedType,
1520                                     BindingFlags.Static | BindingFlags.Public, container);
1521                         AddMembers (MemberTypes.NestedType,
1522                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1523                 }
1524
1525                 void AddMembers (MemberTypes mt, IMemberContainer container)
1526                 {
1527                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1528                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1529                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1530                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1531                 }
1532
1533                 /// <summary>
1534                 ///   Add all members from class `container' with the requested MemberTypes and
1535                 ///   BindingFlags to the cache.  This method is called multiple times with different
1536                 ///   MemberTypes and BindingFlags.
1537                 /// </summary>
1538                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1539                 {
1540                         MemberList members = container.GetMembers (mt, bf);
1541
1542                         foreach (MemberInfo member in members) {
1543                                 string name = member.Name;
1544
1545                                 // We use a name-based hash table of ArrayList's.
1546                                 ArrayList list = (ArrayList) member_hash [name];
1547                                 if (list == null) {
1548                                         list = new ArrayList ();
1549                                         member_hash.Add (name, list);
1550                                 }
1551
1552                                 // When this method is called for the current class, the list will
1553                                 // already contain all inherited members from our base classes.
1554                                 // We cannot add new members in front of the list since this'd be an
1555                                 // expensive operation, that's why the list is sorted in reverse order
1556                                 // (ie. members from the current class are coming last).
1557                                 list.Add (new CacheEntry (container, member, mt, bf));
1558                         }
1559                 }
1560
1561                 /// <summary>
1562                 ///   Add all declared and inherited methods from class `type' to the method cache.
1563                 /// </summary>
1564                 void AddMethods (Type type)
1565                 {
1566                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1567                                     BindingFlags.FlattenHierarchy, type);
1568                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1569                                     BindingFlags.FlattenHierarchy, type);
1570                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1571                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1572                 }
1573
1574                 void AddMethods (BindingFlags bf, Type type)
1575                 {
1576                         //
1577                         // Consider the case:
1578                         //
1579                         //   class X { public virtual int f() {} }
1580                         //   class Y : X {}
1581                         //
1582                         // When processing 'Y', the method_cache will already have a copy of 'f',
1583                         // with ReflectedType == X.  However, we want to ensure that its ReflectedType == Y
1584                         //
1585                         MethodBase [] members = type.GetMethods (bf);
1586
1587                         Array.Reverse (members);
1588
1589                         foreach (MethodBase member in members) {
1590                                 string name = member.Name;
1591
1592                                 // We use a name-based hash table of ArrayList's.
1593                                 ArrayList list = (ArrayList) method_hash [name];
1594                                 if (list == null) {
1595                                         list = new ArrayList ();
1596                                         method_hash.Add (name, list);
1597                                 }
1598
1599                                 Type declaring_type = member.DeclaringType;
1600                                 if (declaring_type == type) {
1601                                         list.Add (new CacheEntry (Container, member, MemberTypes.Method, bf | BindingFlags.DeclaredOnly));
1602                                         continue;
1603                                 }
1604
1605                                 int n = list.Count;
1606                                 while (n-- > 0) {
1607                                         CacheEntry entry = (CacheEntry) list [n];
1608                                         MethodBase old = entry.Member as MethodBase;
1609
1610                                         if (member.MethodHandle.Value == old.MethodHandle.Value &&
1611                                             declaring_type == old.DeclaringType) {
1612                                                 entry.Member = member;
1613                                                 break;
1614                                         }
1615                                 }
1616
1617                                 if (n < 0)
1618                                         throw new InternalErrorException ("cannot find inherited member " + member + " in base classes of " + type);
1619                         }
1620                 }
1621
1622                 /// <summary>
1623                 ///   Compute and return a appropriate `EntryType' magic number for the given
1624                 ///   MemberTypes and BindingFlags.
1625                 /// </summary>
1626                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1627                 {
1628                         EntryType type = EntryType.None;
1629
1630                         if ((mt & MemberTypes.Constructor) != 0)
1631                                 type |= EntryType.Constructor;
1632                         if ((mt & MemberTypes.Event) != 0)
1633                                 type |= EntryType.Event;
1634                         if ((mt & MemberTypes.Field) != 0)
1635                                 type |= EntryType.Field;
1636                         if ((mt & MemberTypes.Method) != 0)
1637                                 type |= EntryType.Method;
1638                         if ((mt & MemberTypes.Property) != 0)
1639                                 type |= EntryType.Property;
1640                         // Nested types are returned by static and instance searches.
1641                         if ((mt & MemberTypes.NestedType) != 0)
1642                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1643
1644                         if ((bf & BindingFlags.Instance) != 0)
1645                                 type |= EntryType.Instance;
1646                         if ((bf & BindingFlags.Static) != 0)
1647                                 type |= EntryType.Static;
1648                         if ((bf & BindingFlags.Public) != 0)
1649                                 type |= EntryType.Public;
1650                         if ((bf & BindingFlags.NonPublic) != 0)
1651                                 type |= EntryType.NonPublic;
1652                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1653                                 type |= EntryType.Declared;
1654
1655                         return type;
1656                 }
1657
1658                 /// <summary>
1659                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1660                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1661                 ///   single member types.
1662                 /// </summary>
1663                 public static bool IsSingleMemberType (MemberTypes mt)
1664                 {
1665                         switch (mt) {
1666                         case MemberTypes.Constructor:
1667                         case MemberTypes.Event:
1668                         case MemberTypes.Field:
1669                         case MemberTypes.Method:
1670                         case MemberTypes.Property:
1671                         case MemberTypes.NestedType:
1672                                 return true;
1673
1674                         default:
1675                                 return false;
1676                         }
1677                 }
1678
1679                 /// <summary>
1680                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1681                 ///   number to speed up the searching process.
1682                 /// </summary>
1683                 [Flags]
1684                 protected enum EntryType {
1685                         None            = 0x000,
1686
1687                         Instance        = 0x001,
1688                         Static          = 0x002,
1689                         MaskStatic      = Instance|Static,
1690
1691                         Public          = 0x004,
1692                         NonPublic       = 0x008,
1693                         MaskProtection  = Public|NonPublic,
1694
1695                         Declared        = 0x010,
1696
1697                         Constructor     = 0x020,
1698                         Event           = 0x040,
1699                         Field           = 0x080,
1700                         Method          = 0x100,
1701                         Property        = 0x200,
1702                         NestedType      = 0x400,
1703
1704                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1705                 }
1706
1707                 protected class CacheEntry {
1708                         public readonly IMemberContainer Container;
1709                         public EntryType EntryType;
1710                         public MemberInfo Member;
1711
1712                         public CacheEntry (IMemberContainer container, MemberInfo member,
1713                                            MemberTypes mt, BindingFlags bf)
1714                         {
1715                                 this.Container = container;
1716                                 this.Member = member;
1717                                 this.EntryType = GetEntryType (mt, bf);
1718                         }
1719
1720                         public override string ToString ()
1721                         {
1722                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1723                                                       EntryType, Member);
1724                         }
1725                 }
1726
1727                 /// <summary>
1728                 ///   This is called each time we're walking up one level in the class hierarchy
1729                 ///   and checks whether we can abort the search since we've already found what
1730                 ///   we were looking for.
1731                 /// </summary>
1732                 protected bool DoneSearching (ArrayList list)
1733                 {
1734                         //
1735                         // We've found exactly one member in the current class and it's not
1736                         // a method or constructor.
1737                         //
1738                         if (list.Count == 1 && !(list [0] is MethodBase))
1739                                 return true;
1740
1741                         //
1742                         // Multiple properties: we query those just to find out the indexer
1743                         // name
1744                         //
1745                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1746                                 return true;
1747
1748                         return false;
1749                 }
1750
1751                 /// <summary>
1752                 ///   Looks up members with name `name'.  If you provide an optional
1753                 ///   filter function, it'll only be called with members matching the
1754                 ///   requested member name.
1755                 ///
1756                 ///   This method will try to use the cache to do the lookup if possible.
1757                 ///
1758                 ///   Unlike other FindMembers implementations, this method will always
1759                 ///   check all inherited members - even when called on an interface type.
1760                 ///
1761                 ///   If you know that you're only looking for methods, you should use
1762                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1763                 ///   When doing a method-only search, it'll try to use a special method
1764                 ///   cache (unless it's a dynamic type or an interface) and the returned
1765                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1766                 ///   The lookup process will automatically restart itself in method-only
1767                 ///   search mode if it discovers that it's about to return methods.
1768                 /// </summary>
1769                 ArrayList global = new ArrayList ();
1770                 bool using_global = false;
1771
1772                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1773
1774                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1775                                                   MemberFilter filter, object criteria)
1776                 {
1777                         if (using_global)
1778                                 throw new Exception ();
1779
1780                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1781                         bool method_search = mt == MemberTypes.Method;
1782                         // If we have a method cache and we aren't already doing a method-only search,
1783                         // then we restart a method search if the first match is a method.
1784                         bool do_method_search = !method_search && (method_hash != null);
1785
1786                         ArrayList applicable;
1787
1788                         // If this is a method-only search, we try to use the method cache if
1789                         // possible; a lookup in the method cache will return a MemberInfo with
1790                         // the correct ReflectedType for inherited methods.
1791
1792                         if (method_search && (method_hash != null))
1793                                 applicable = (ArrayList) method_hash [name];
1794                         else
1795                                 applicable = (ArrayList) member_hash [name];
1796
1797                         if (applicable == null)
1798                                 return emptyMemberInfo;
1799
1800                         //
1801                         // 32  slots gives 53 rss/54 size
1802                         // 2/4 slots gives 55 rss
1803                         //
1804                         // Strange: from 25,000 calls, only 1,800
1805                         // are above 2.  Why does this impact it?
1806                         //
1807                         global.Clear ();
1808                         using_global = true;
1809
1810                         Timer.StartTimer (TimerType.CachedLookup);
1811
1812                         EntryType type = GetEntryType (mt, bf);
1813
1814                         IMemberContainer current = Container;
1815
1816
1817                         // `applicable' is a list of all members with the given member name `name'
1818                         // in the current class and all its base classes.  The list is sorted in
1819                         // reverse order due to the way how the cache is initialy created (to speed
1820                         // things up, we're doing a deep-copy of our base).
1821
1822                         for (int i = applicable.Count-1; i >= 0; i--) {
1823                                 CacheEntry entry = (CacheEntry) applicable [i];
1824
1825                                 // This happens each time we're walking one level up in the class
1826                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
1827                                 // the first time this happens (this may already happen in the first
1828                                 // iteration of this loop if there are no members with the name we're
1829                                 // looking for in the current class).
1830                                 if (entry.Container != current) {
1831                                         if (declared_only || DoneSearching (global))
1832                                                 break;
1833
1834                                         current = entry.Container;
1835                                 }
1836
1837                                 // Is the member of the correct type ?
1838                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
1839                                         continue;
1840
1841                                 // Is the member static/non-static ?
1842                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
1843                                         continue;
1844
1845                                 // Apply the filter to it.
1846                                 if (filter (entry.Member, criteria)) {
1847                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
1848                                                 do_method_search = false;
1849                                         global.Add (entry.Member);
1850                                 }
1851                         }
1852
1853                         Timer.StopTimer (TimerType.CachedLookup);
1854
1855                         // If we have a method cache and we aren't already doing a method-only
1856                         // search, we restart in method-only search mode if the first match is
1857                         // a method.  This ensures that we return a MemberInfo with the correct
1858                         // ReflectedType for inherited methods.
1859                         if (do_method_search && (global.Count > 0)){
1860                                 using_global = false;
1861
1862                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
1863                         }
1864
1865                         using_global = false;
1866                         MemberInfo [] copy = new MemberInfo [global.Count];
1867                         global.CopyTo (copy);
1868                         return copy;
1869                 }
1870
1871                 // find the nested type @name in @this.
1872                 public Type FindNestedType (string name)
1873                 {
1874                         ArrayList applicable = (ArrayList) member_hash [name];
1875                         if (applicable == null)
1876                                 return null;
1877
1878                         for (int i = applicable.Count-1; i >= 0; i--) {
1879                                 CacheEntry entry = (CacheEntry) applicable [i];
1880                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
1881                                         return (Type) entry.Member;
1882                         }
1883
1884                         return null;
1885                 }
1886
1887                 //
1888                 // This finds the method or property for us to override. invocationType is the type where
1889                 // the override is going to be declared, name is the name of the method/property, and
1890                 // paramTypes is the parameters, if any to the method or property
1891                 //
1892                 // Because the MemberCache holds members from this class and all the base classes,
1893                 // we can avoid tons of reflection stuff.
1894                 //
1895                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
1896                 {
1897                         ArrayList applicable;
1898                         if (method_hash != null && !is_property)
1899                                 applicable = (ArrayList) method_hash [name];
1900                         else
1901                                 applicable = (ArrayList) member_hash [name];
1902
1903                         if (applicable == null)
1904                                 return null;
1905                         //
1906                         // Walk the chain of methods, starting from the top.
1907                         //
1908                         for (int i = applicable.Count - 1; i >= 0; i--) {
1909                                 CacheEntry entry = (CacheEntry) applicable [i];
1910
1911                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
1912                                         continue;
1913
1914                                 PropertyInfo pi = null;
1915                                 MethodInfo mi = null;
1916                                 FieldInfo fi = null;
1917                                 Type [] cmpAttrs = null;
1918
1919                                 if (is_property) {
1920                                         if ((entry.EntryType & EntryType.Field) != 0) {
1921                                                 fi = (FieldInfo)entry.Member;
1922
1923                                                 // TODO: For this case we ignore member type
1924                                                 //fb = TypeManager.GetField (fi);
1925                                                 //cmpAttrs = new Type[] { fb.MemberType };
1926                                         } else {
1927                                                 pi = (PropertyInfo) entry.Member;
1928                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
1929                                         }
1930                                 } else {
1931                                         mi = (MethodInfo) entry.Member;
1932                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
1933                                 }
1934
1935                                 if (fi != null) {
1936                                         // TODO: Almost duplicate !
1937                                         // Check visibility
1938                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
1939                                                 case FieldAttributes.Private:
1940                                                         //
1941                                                         // A private method is Ok if we are a nested subtype.
1942                                                         // The spec actually is not very clear about this, see bug 52458.
1943                                                         //
1944                                                         if (invocationType != entry.Container.Type &
1945                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1946                                                                 continue;
1947
1948                                                         break;
1949                                                 case FieldAttributes.FamANDAssem:
1950                                                 case FieldAttributes.Assembly:
1951                                                         //
1952                                                         // Check for assembly methods
1953                                                         //
1954                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
1955                                                                 continue;
1956                                                         break;
1957                                         }
1958                                         return entry.Member;
1959                                 }
1960
1961                                 //
1962                                 // Check the arguments
1963                                 //
1964                                 if (cmpAttrs.Length != paramTypes.Length)
1965                                         continue;
1966
1967                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --)
1968                                         if (paramTypes [j] != cmpAttrs [j])
1969                                                 goto next;
1970
1971                                 //
1972                                 // get one of the methods because this has the visibility info.
1973                                 //
1974                                 if (is_property) {
1975                                         mi = pi.GetGetMethod (true);
1976                                         if (mi == null)
1977                                                 mi = pi.GetSetMethod (true);
1978                                 }
1979
1980                                 //
1981                                 // Check visibility
1982                                 //
1983                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
1984                                 case MethodAttributes.Private:
1985                                         //
1986                                         // A private method is Ok if we are a nested subtype.
1987                                         // The spec actually is not very clear about this, see bug 52458.
1988                                         //
1989                                         if (invocationType == entry.Container.Type ||
1990                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1991                                                 return entry.Member;
1992
1993                                         break;
1994                                 case MethodAttributes.FamANDAssem:
1995                                 case MethodAttributes.Assembly:
1996                                         //
1997                                         // Check for assembly methods
1998                                         //
1999                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
2000                                                 return entry.Member;
2001
2002                                         break;
2003                                 default:
2004                                         //
2005                                         // A protected method is ok, because we are overriding.
2006                                         // public is always ok.
2007                                         //
2008                                         return entry.Member;
2009                                 }
2010                         next:
2011                                 ;
2012                         }
2013
2014                         return null;
2015                 }
2016
2017                 /// <summary>
2018                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2019                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2020                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2021                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2022                 /// </summary>
2023                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2024                 {
2025                         ArrayList applicable = null;
2026
2027                         if (method_hash != null)
2028                                 applicable = (ArrayList) method_hash [name];
2029
2030                         if (applicable != null) {
2031                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2032                                         CacheEntry entry = (CacheEntry) applicable [i];
2033                                         if ((entry.EntryType & EntryType.Public) != 0)
2034                                                 return entry.Member;
2035                                 }
2036                         }
2037
2038                         if (member_hash == null)
2039                                 return null;
2040                         applicable = (ArrayList) member_hash [name];
2041
2042                         if (applicable != null) {
2043                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2044                                         CacheEntry entry = (CacheEntry) applicable [i];
2045                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2046                                                 if (ignore_complex_types) {
2047                                                         if ((entry.EntryType & EntryType.Method) != 0)
2048                                                                 continue;
2049
2050                                                         // Does exist easier way how to detect indexer ?
2051                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2052                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
2053                                                                 if (arg_types.Length > 0)
2054                                                                         continue;
2055                                                         }
2056                                                 }
2057                                                 return entry.Member;
2058                                         }
2059                                 }
2060                         }
2061                         return null;
2062                 }
2063
2064                 Hashtable locase_table;
2065
2066                 /// <summary>
2067                 /// Builds low-case table for CLS Compliance test
2068                 /// </summary>
2069                 public Hashtable GetPublicMembers ()
2070                 {
2071                         if (locase_table != null)
2072                                 return locase_table;
2073
2074                         locase_table = new Hashtable ();
2075                         foreach (DictionaryEntry entry in member_hash) {
2076                                 ArrayList members = (ArrayList)entry.Value;
2077                                 for (int ii = 0; ii < members.Count; ++ii) {
2078                                         CacheEntry member_entry = (CacheEntry) members [ii];
2079
2080                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2081                                                 continue;
2082
2083                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2084                                         switch (member_entry.EntryType & EntryType.MaskType) {
2085                                                 case EntryType.Constructor:
2086                                                         continue;
2087
2088                                                 case EntryType.Field:
2089                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2090                                                                 continue;
2091                                                         break;
2092
2093                                                 case EntryType.Method:
2094                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2095                                                                 continue;
2096                                                         break;
2097
2098                                                 case EntryType.Property:
2099                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
2100                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2101                                                                 continue;
2102                                                         break;
2103
2104                                                 case EntryType.Event:
2105                                                         EventInfo ei = (EventInfo)member_entry.Member;
2106                                                         MethodInfo mi = ei.GetAddMethod ();
2107                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2108                                                                 continue;
2109                                                         break;
2110                                         }
2111                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2112                                         locase_table [lcase] = member_entry.Member;
2113                                         break;
2114                                 }
2115                         }
2116                         return locase_table;
2117                 }
2118
2119                 public Hashtable Members {
2120                         get {
2121                                 return member_hash;
2122                         }
2123                 }
2124
2125                 /// <summary>
2126                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2127                 /// </summary>
2128                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2129                 {
2130                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2131
2132                         for (int i = 0; i < al.Count; ++i) {
2133                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2134
2135                                 // skip itself
2136                                 if (entry.Member == this_builder)
2137                                         continue;
2138
2139                                 if ((entry.EntryType & tested_type) != tested_type)
2140                                         continue;
2141
2142                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2143                                 if (AttributeTester.AreOverloadedMethodParamsClsCompliant (method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare)))
2144                                         continue;
2145
2146                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2147
2148                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2149                                 // However it is exactly what csc does.
2150                                 if (md != null && !md.IsClsCompliaceRequired (method.Parent))
2151                                         continue;
2152
2153                                 Report.SymbolRelatedToPreviousError (entry.Member);
2154                                 Report.Error (3006, method.Location, "Overloaded method '{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2155                         }
2156                 }
2157         }
2158 }