mcs/gmcs/decl.cs

   1 //
   2 // decl.cs: Declaration base class for structs, classes, enums and interfaces.
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10 // (C) 2004 Novell, Inc
  11 //
  12 // TODO: Move the method verification stuff from the class.cs and interface.cs here
  13 //
  14
  15 using System;
  16 using System.Text;
  17 using System.Collections;
  18 using System.Globalization;
  19 using System.Reflection.Emit;
  20 using System.Reflection;
  21 using System.Xml;
  22
  23 namespace Mono.CSharp {
  24
  25         public class MemberName {
  26                 public readonly string Name;
  27                 public readonly TypeArguments TypeArguments;
  28
  29                 public readonly MemberName Left;
  30
  31                 public static readonly MemberName Null = new MemberName ("");
  32
  33                 public MemberName (string name)
  34                 {
  35                         this.Name = name;
  36                 }
  37
  38                 public MemberName (string name, TypeArguments args)
  39                         : this (name)
  40                 {
  41                         this.TypeArguments = args;
  42                 }
  43
  44                 public MemberName (MemberName left, string name)
  45                         : this (left, name, null)
  46                 {
  47                 }
  48
  49                 public MemberName (MemberName left, string name, TypeArguments args)
  50                         : this (name, args)
  51                 {
  52                         this.Left = left;
  53                 }
  54
  55                 public MemberName (MemberName left, MemberName right)
  56                         : this (left, right.Name, right.TypeArguments)
  57                 {
  58                         Name = right.Name;
  59                         Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  60                         TypeArguments = right.TypeArguments;
  61                 }
  62
  63                 static readonly char [] dot_array = { '.' };
  64
  65                 public static MemberName FromDotted (string name)
  66                 {
  67                         string [] elements = name.Split (dot_array);
  68                         int count = elements.Length;
  69                         int i = 0;
  70                         MemberName n = new MemberName (elements [i++]);
  71                         while (i < count)
  72                                 n = new MemberName (n, elements [i++]);
  73                         return n;
  74                 }
  75
  76                 public string GetName ()
  77                 {
  78                         if (Left != null)
  79                                 return Left.GetName () + "." + Name;
  80                         else
  81                                 return Name;
  82                 }
  83
  84                 public bool IsGeneric {
  85                         get {
  86                                 if (TypeArguments != null)
  87                                         return true;
  88                                 else if (Left != null)
  89                                         return Left.IsGeneric;
  90                                 else
  91                                         return false;
  92                         }
  93                 }
  94
  95                 public string GetName (bool is_generic)
  96                 {
  97                         string name = is_generic ? Basename : Name;
  98                         if (Left != null)
  99                                 return Left.GetName (is_generic) + "." + name;
 100                         else
 101                                 return name;
 102                 }
 103
 104                 public int CountTypeArguments {
 105                         get {
 106                                 if (TypeArguments == null)
 107                                         return 0;
 108                                 else
 109                                         return TypeArguments.Count;
 110                         }
 111                 }
 112
 113                 public string GetMethodName ()
 114                 {
 115                         if (Left != null)
 116                                 return Left.GetTypeName () + "." + Name;
 117                         else
 118                                 return Name;
 119                 }
 120
 121                 public static string MakeName (string name, TypeArguments args)
 122                 {
 123                         if (args == null)
 124                                 return name;
 125                         else
 126                                 return name + "`" + args.Count;
 127                 }
 128
 129                 public static string MakeName (string name, int count)
 130                 {
 131                         return name + "`" + count;
 132                 }
 133
 134                 public string GetTypeName ()
 135                 {
 136                         if (Left != null)
 137                                 return Left.GetTypeName () + "." +
 138                                         MakeName (Name, TypeArguments);
 139                         else
 140                                 return MakeName (Name, TypeArguments);
 141                 }
 142
 143                 protected bool IsUnbound {
 144                         get {
 145                                 if ((Left != null) && Left.IsUnbound)
 146                                         return true;
 147                                 else if (TypeArguments == null)
 148                                         return false;
 149                                 else
 150                                         return TypeArguments.IsUnbound;
 151                         }
 152                 }
 153
 154                 protected bool CheckUnbound (Location loc)
 155                 {
 156                         if ((Left != null) && !Left.CheckUnbound (loc))
 157                                 return false;
 158                         if ((TypeArguments != null) && !TypeArguments.IsUnbound) {
 159                                 Report.Error (1031, loc, "Type expected");
 160                                 return false;
 161                         }
 162
 163                         return true;
 164                 }
 165
 166                 public Expression GetTypeExpression (Location loc)
 167                 {
 168                         if (IsUnbound) {
 169                                 if (!CheckUnbound (loc))
 170                                         return null;
 171
 172                                 return new UnboundTypeExpression (GetTypeName ());
 173                         }
 174
 175                         if (Left != null) {
 176                                 Expression lexpr = Left.GetTypeExpression (loc);
 177
 178                                 return new MemberAccess (lexpr, Name, TypeArguments, loc);
 179                         } else {
 180                                 if (TypeArguments != null)
 181                                         return new SimpleName (Basename, TypeArguments, loc);
 182                                 else
 183                                         return new SimpleName (Name, loc);
 184                         }
 185                 }
 186
 187                 public MemberName Clone ()
 188                 {
 189                         if (Left != null)
 190                                 return new MemberName (Left.Clone (), Name, TypeArguments);
 191                         else
 192                                 return new MemberName (Name, TypeArguments);
 193                 }
 194
 195                 public string Basename {
 196                         get {
 197                                 if (TypeArguments != null)
 198                                         return MakeName (Name, TypeArguments);
 199                                 else
 200                                         return Name;
 201                         }
 202                 }
 203
 204                 public override string ToString ()
 205                 {
 206                         string full_name;
 207                         if (TypeArguments != null)
 208                                 full_name = Name + "<" + TypeArguments + ">";
 209                         else
 210                                 full_name = Name;
 211
 212                         if (Left != null)
 213                                 return Left + "." + full_name;
 214                         else
 215                                 return full_name;
 216                 }
 217
 218                 public override bool Equals (object other)
 219                 {
 220                         return Equals (other as MemberName);
 221                 }
 222
 223                 public bool Equals (MemberName other)
 224                 {
 225                         if (this == other)
 226                                 return true;
 227                         if (other == null || Name != other.Name)
 228                                 return false;
 229
 230                         if ((TypeArguments != null) &&
 231                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 232                                 return false;
 233
 234                         if ((TypeArguments == null) && (other.TypeArguments != null))
 235                                 return false;
 236
 237                         if (Left == null)
 238                                 return other.Left == null;
 239
 240                         return Left.Equals (other.Left);
 241                 }
 242
 243                 public override int GetHashCode ()
 244                 {
 245                         int hash = Name.GetHashCode ();
 246                         for (MemberName n = Left; n != null; n = n.Left)
 247                                 hash ^= n.Name.GetHashCode ();
 248
 249                         if (TypeArguments != null)
 250                                 hash ^= TypeArguments.Count << 5;
 251
 252                         return hash & 0x7FFFFFFF;
 253                 }
 254         }
 255
 256         /// <summary>
 257         ///   Base representation for members.  This is used to keep track
 258         ///   of Name, Location and Modifier flags, and handling Attributes.
 259         /// </summary>
 260         public abstract class MemberCore : Attributable {
 261                 /// <summary>
 262                 ///   Public name
 263                 /// </summary>
 264
 265                 protected string cached_name;
 266                 public string Name {
 267                         get {
 268                                 if (cached_name == null)
 269                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 270                                 return cached_name;
 271                         }
 272                 }
 273
 274                 // Is not readonly because of IndexerName attribute
 275                 private MemberName member_name;
 276                 public MemberName MemberName {
 277                         get { return member_name; }
 278                 }
 279
 280                 /// <summary>
 281                 ///   Modifier flags that the user specified in the source code
 282                 /// </summary>
 283                 public int ModFlags;
 284
 285                 public /*readonly*/ TypeContainer Parent;
 286
 287                 /// <summary>
 288                 ///   Location where this declaration happens
 289                 /// </summary>
 290                 public readonly Location Location;
 291
 292                 /// <summary>
 293                 ///   XML documentation comment
 294                 /// </summary>
 295                 public string DocComment;
 296
 297                 /// <summary>
 298                 ///   Represents header string for documentation comment
 299                 ///   for each member types.
 300                 /// </summary>
 301                 public abstract string DocCommentHeader { get; }
 302
 303                 [Flags]
 304                 public enum Flags {
 305                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 306                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 307                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 308                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 309                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 310                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 311                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 312                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 313                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 314                         Excluded = 1 << 9,                                      // Method is conditional
 315                         TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
 316                         IsUsed = 1 << 11
 317                 }
 318
 319                 /// <summary>
 320                 ///   MemberCore flags at first detected then cached
 321                 /// </summary>
 322                 internal Flags caching_flags;
 323
 324                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs,
 325                                    Location loc)
 326                         : base (attrs)
 327                 {
 328                         if (parent is PartialContainer && !(this is PartialContainer))
 329                                 throw new InternalErrorException ("A PartialContainer cannot be the direct parent of a member");
 330
 331                         Parent = parent;
 332                         member_name = name;
 333                         Location = loc;
 334                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 335                 }
 336
 337                 protected virtual void SetMemberName (MemberName new_name)
 338                 {
 339                         member_name = new_name;
 340                         cached_name = null;
 341                 }
 342
 343                 /// <summary>
 344                 /// Tests presence of ObsoleteAttribute and report proper error
 345                 /// </summary>
 346                 protected void CheckUsageOfObsoleteAttribute (Type type)
 347                 {
 348                         if (type == null)
 349                                 return;
 350
 351                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
 352                         if (obsolete_attr == null)
 353                                 return;
 354
 355                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
 356                 }
 357
 358                 public abstract bool Define ();
 359
 360                 //
 361                 // Returns full member name for error message
 362                 //
 363                 public virtual string GetSignatureForError ()
 364                 {
 365                         return Name;
 366                 }
 367
 368                 /// <summary>
 369                 /// Use this method when MethodBuilder is null
 370                 /// </summary>
 371                 public virtual string GetSignatureForError (TypeContainer tc)
 372                 {
 373                         return Name;
 374                 }
 375
 376                 /// <summary>
 377                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 378                 /// </summary>
 379                 public virtual void Emit ()
 380                 {
 381                         // Hack with Parent == null is for EnumMember
 382                         if (Parent == null || (GetObsoleteAttribute (Parent) == null && Parent.GetObsoleteAttribute (Parent) == null))
 383                                 VerifyObsoleteAttribute ();
 384
 385                         if (!RootContext.VerifyClsCompliance)
 386                                 return;
 387
 388                         VerifyClsCompliance (Parent);
 389                 }
 390
 391                 public bool InUnsafe {
 392                         get {
 393                                 return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
 394                         }
 395                 }
 396
 397                 public virtual bool IsUsed {
 398                         get {
 399                                 return (caching_flags & Flags.IsUsed) != 0;
 400                         }
 401                 }
 402
 403                 public void SetMemberIsUsed ()
 404                 {
 405                         caching_flags |= Flags.IsUsed;
 406                 }
 407
 408                 //
 409                 // Whehter is it ok to use an unsafe pointer in this type container
 410                 //
 411                 public bool UnsafeOK (DeclSpace parent)
 412                 {
 413                         //
 414                         // First check if this MemberCore modifier flags has unsafe set
 415                         //
 416                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 417                                 return true;
 418
 419                         if (parent.UnsafeContext)
 420                                 return true;
 421
 422                         Expression.UnsafeError (Location);
 423                         return false;
 424                 }
 425
 426                 /// <summary>
 427                 /// Returns instance of ObsoleteAttribute for this MemberCore
 428                 /// </summary>
 429                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 430                 {
 431                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 432                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 433                                 return null;
 434                         }
 435
 436                         caching_flags &= ~Flags.Obsolete_Undetected;
 437
 438                         if (OptAttributes == null)
 439                                 return null;
 440
 441                         Attribute obsolete_attr = OptAttributes.Search (
 442                                 TypeManager.obsolete_attribute_type, ds.EmitContext);
 443                         if (obsolete_attr == null)
 444                                 return null;
 445
 446                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds.EmitContext);
 447                         if (obsolete == null)
 448                                 return null;
 449
 450                         caching_flags |= Flags.Obsolete;
 451                         return obsolete;
 452                 }
 453
 454                 /// <summary>
 455                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 456                 /// </summary>
 457                 public override bool IsClsCompliaceRequired (DeclSpace container)
 458                 {
 459                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 460                                 return (caching_flags & Flags.ClsCompliant) != 0;
 461
 462                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 463                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 464                                 caching_flags |= Flags.ClsCompliant;
 465                                 return true;
 466                         }
 467
 468                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 469                         return false;
 470                 }
 471
 472                 /// <summary>
 473                 /// Returns true when MemberCore is exposed from assembly.
 474                 /// </summary>
 475                 public bool IsExposedFromAssembly (DeclSpace ds)
 476                 {
 477                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 478                                 return false;
 479
 480                         DeclSpace parentContainer = ds;
 481                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 482                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 483                                         return false;
 484                                 parentContainer = parentContainer.Parent;
 485                         }
 486                         return true;
 487                 }
 488
 489                 /// <summary>
 490                 /// Resolve CLSCompliantAttribute value or gets cached value.
 491                 /// </summary>
 492                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 493                 {
 494                         if (OptAttributes != null) {
 495                                 Attribute cls_attribute = OptAttributes.Search (
 496                                         TypeManager.cls_compliant_attribute_type, ds.EmitContext);
 497                                 if (cls_attribute != null) {
 498                                         caching_flags |= Flags.HasClsCompliantAttribute;
 499                                         return cls_attribute.GetClsCompliantAttributeValue (ds.EmitContext);
 500                                 }
 501                         }
 502                         return ds.GetClsCompliantAttributeValue ();
 503                 }
 504
 505                 /// <summary>
 506                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 507                 /// </summary>
 508                 protected bool HasClsCompliantAttribute {
 509                         get {
 510                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 511                         }
 512                 }
 513
 514                 /// <summary>
 515                 /// It helps to handle error 102 & 111 detection
 516                 /// </summary>
 517                 public virtual bool MarkForDuplicationCheck ()
 518                 {
 519                         return false;
 520                 }
 521
 522                 /// <summary>
 523                 /// The main virtual method for CLS-Compliant verifications.
 524                 /// The method returns true if member is CLS-Compliant and false if member is not
 525                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 526                 /// and add their extra verifications.
 527                 /// </summary>
 528                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 529                 {
 530                         if (!IsClsCompliaceRequired (ds)) {
 531                                 if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
 532                                         if (!IsExposedFromAssembly (ds))
 533                                                 Report.Warning (3019, Location, "CLS compliance checking will not be performed on '{0}' because it is private or internal", GetSignatureForError ());
 534                                         if (!CodeGen.Assembly.IsClsCompliant)
 535                                                 Report.Warning (3021, Location, "'{0}' does not need a CLSCompliant attribute because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 536                                 }
 537                                 return false;
 538                         }
 539
 540                         if (!CodeGen.Assembly.IsClsCompliant) {
 541                                 if (HasClsCompliantAttribute) {
 542                                         Report.Error (3014, Location, "'{0}' cannot be marked as CLS-compliant because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 543                                 }
 544                                 return false;
 545                         }
 546
 547                         int index = Name.LastIndexOf ('.');
 548                         if (Name [index > 0 ? index + 1 : 0] == '_') {
 549                                 Report.Error (3008, Location, "Identifier '{0}' is not CLS-compliant", GetSignatureForError () );
 550                         }
 551                         return true;
 552                 }
 553
 554                 protected abstract void VerifyObsoleteAttribute ();
 555
 556                 //
 557                 // Raised (and passed an XmlElement that contains the comment)
 558                 // when GenerateDocComment is writing documentation expectedly.
 559                 //
 560                 internal virtual void OnGenerateDocComment (DeclSpace ds, XmlElement intermediateNode)
 561                 {
 562                 }
 563
 564                 //
 565                 // Returns a string that represents the signature for this
 566                 // member which should be used in XML documentation.
 567                 //
 568                 public virtual string GetDocCommentName (DeclSpace ds)
 569                 {
 570                         if (ds == null || this is DeclSpace)
 571                                 return DocCommentHeader + Name;
 572                         else
 573                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 574                 }
 575
 576                 //
 577                 // Generates xml doc comments (if any), and if required,
 578                 // handle warning report.
 579                 //
 580                 internal virtual void GenerateDocComment (DeclSpace ds)
 581                 {
 582                         DocUtil.GenerateDocComment (this, ds);
 583                 }
 584         }
 585
 586         /// <summary>
 587         ///   Base class for structs, classes, enumerations and interfaces.
 588         /// </summary>
 589         /// <remarks>
 590         ///   They all create new declaration spaces.  This
 591         ///   provides the common foundation for managing those name
 592         ///   spaces.
 593         /// </remarks>
 594         public abstract class DeclSpace : MemberCore, IAlias {
 595                 /// <summary>
 596                 ///   This points to the actual definition that is being
 597                 ///   created with System.Reflection.Emit
 598                 /// </summary>
 599                 public TypeBuilder TypeBuilder;
 600
 601                 /// <summary>
 602                 ///   If we are a generic type, this is the type we are
 603                 ///   currently defining.  We need to lookup members on this
 604                 ///   instead of the TypeBuilder.
 605                 /// </summary>
 606                 public Type CurrentType;
 607
 608                 //
 609                 // This is the namespace in which this typecontainer
 610                 // was declared.  We use this to resolve names.
 611                 //
 612                 public NamespaceEntry NamespaceEntry;
 613
 614                 private Hashtable Cache = new Hashtable ();
 615
 616                 public readonly string Basename;
 617
 618                 protected Hashtable defined_names;
 619
 620                 readonly bool is_generic;
 621                 readonly int count_type_params;
 622                 readonly int count_current_type_params;
 623
 624                 // The emit context for toplevel objects.
 625                 protected EmitContext ec;
 626
 627                 public EmitContext EmitContext {
 628                         get { return ec; }
 629                 }
 630
 631                 //
 632                 // Whether we are Generic
 633                 //
 634                 public bool IsGeneric {
 635                         get {
 636                                 if (is_generic)
 637                                         return true;
 638                                 else if (Parent != null)
 639                                         return Parent.IsGeneric;
 640                                 else
 641                                         return false;
 642                         }
 643                 }
 644
 645                 static string[] attribute_targets = new string [] { "type" };
 646
 647                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 648                                   Attributes attrs, Location l)
 649                         : base (parent, name, attrs, l)
 650                 {
 651                         NamespaceEntry = ns;
 652                         Basename = name.Basename;
 653                         defined_names = new Hashtable ();
 654                         if (name.TypeArguments != null) {
 655                                 is_generic = true;
 656                                 count_type_params = count_current_type_params = name.TypeArguments.Count;
 657                         }
 658                         if (parent != null)
 659                                 count_type_params += parent.count_type_params;
 660                 }
 661
 662                 /// <summary>
 663                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 664                 /// </summary>
 665                 protected bool AddToContainer (MemberCore symbol, string name)
 666                 {
 667                         if (name == Basename && !(this is Interface) && !(this is Enum)) {
 668                                 if (symbol is TypeParameter)
 669                                         Report.Error (694, "Type parameter `{0}' has same name as " +
 670                                                       "containing type or method", name);
 671                                 else {
 672                                         Report.SymbolRelatedToPreviousError (this);
 673                                         Report.Error (542, "'{0}': member names cannot be the same as their " +
 674                                                       "enclosing type", symbol.Location, symbol.GetSignatureForError ());
 675                                 }
 676                                 return false;
 677                         }
 678
 679                         MemberCore mc = (MemberCore) defined_names [name];
 680
 681                         if (mc == null) {
 682                                 defined_names.Add (name, symbol);
 683                                 return true;
 684                         }
 685
 686                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 687                                 return true;
 688
 689                         if (symbol is TypeParameter)
 690                                 Report.Error (692, symbol.Location, "Duplicate type parameter `{0}'", name);
 691                         else {
 692                                 Report.SymbolRelatedToPreviousError (mc);
 693                                 Report.Error (102, symbol.Location,
 694                                               "The type '{0}' already contains a definition for '{1}'",
 695                                               GetSignatureForError (), name);
 696                         }
 697                         return false;
 698                 }
 699
 700                 public void RecordDecl ()
 701                 {
 702                         if ((NamespaceEntry != null) && (Parent == RootContext.Tree.Types))
 703                                 NamespaceEntry.DefineName (MemberName.Basename, this);
 704                 }
 705
 706                 /// <summary>
 707                 ///   Returns the MemberCore associated with a given name in the declaration
 708                 ///   space. It doesn't return method based symbols !!
 709                 /// </summary>
 710                 ///
 711                 public MemberCore GetDefinition (string name)
 712                 {
 713                         return (MemberCore)defined_names [name];
 714                 }
 715
 716                 //
 717                 // root_types contains all the types.  All TopLevel types
 718                 // hence have a parent that points to `root_types', that is
 719                 // why there is a non-obvious test down here.
 720                 //
 721                 public bool IsTopLevel {
 722                         get {
 723                                 if (Parent != null){
 724                                         if (Parent.Parent == null)
 725                                                 return true;
 726                                 }
 727                                 return false;
 728                         }
 729                 }
 730
 731                 public virtual void CloseType ()
 732                 {
 733                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 734                                 try {
 735                                         TypeBuilder.CreateType ();
 736                                 } catch {
 737                                         //
 738                                         // The try/catch is needed because
 739                                         // nested enumerations fail to load when they
 740                                         // are defined.
 741                                         //
 742                                         // Even if this is the right order (enumerations
 743                                         // declared after types).
 744                                         //
 745                                         // Note that this still creates the type and
 746                                         // it is possible to save it
 747                                 }
 748                                 caching_flags |= Flags.CloseTypeCreated;
 749                         }
 750                 }
 751
 752                 protected virtual TypeAttributes TypeAttr {
 753                         get {
 754                                 return CodeGen.Module.DefaultCharSetType;
 755                         }
 756                 }
 757
 758                 /// <remarks>
 759                 ///  Should be overriten by the appropriate declaration space
 760                 /// </remarks>
 761                 public abstract TypeBuilder DefineType ();
 762
 763                 /// <summary>
 764                 ///   Define all members, but don't apply any attributes or do anything which may
 765                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 766                 /// </summary>
 767                 public abstract bool DefineMembers (TypeContainer parent);
 768
 769                 //
 770                 // Whether this is an `unsafe context'
 771                 //
 772                 public bool UnsafeContext {
 773                         get {
 774                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 775                                         return true;
 776                                 if (Parent != null)
 777                                         return Parent.UnsafeContext;
 778                                 return false;
 779                         }
 780                 }
 781
 782                 EmitContext type_resolve_ec;
 783                 protected EmitContext TypeResolveEmitContext {
 784                         get {
 785                                 if (type_resolve_ec == null) {
 786                                         // FIXME: I think this should really be one of:
 787                                         //
 788                                         // a. type_resolve_ec = Parent.EmitContext;
 789                                         // b. type_resolve_ec = new EmitContext (Parent, Parent, loc, null, null, ModFlags, false);
 790                                         //
 791                                         // However, if Parent == RootContext.Tree.Types, its NamespaceEntry will be null.
 792                                         //
 793                                         type_resolve_ec = new EmitContext (Parent, this, Location.Null, null, null, ModFlags, false);
 794                                 }
 795                                 return type_resolve_ec;
 796                         }
 797                 }
 798
 799                 // <summary>
 800                 //    Resolves the expression `e' for a type, and will recursively define
 801                 //    types.  This should only be used for resolving base types.
 802                 // </summary>
 803                 public TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
 804                 {
 805                         TypeResolveEmitContext.loc = loc;
 806                         TypeResolveEmitContext.ContainerType = TypeBuilder;
 807                         if (this is GenericMethod)
 808                                 TypeResolveEmitContext.ContainerType = Parent.TypeBuilder;
 809                         else
 810                                 TypeResolveEmitContext.ContainerType = TypeBuilder;
 811
 812                         return e.ResolveAsTypeTerminal (TypeResolveEmitContext);
 813                 }
 814
 815                 public bool CheckAccessLevel (Type check_type)
 816                 {
 817                         TypeBuilder tb;
 818                         if ((this is GenericMethod) || (this is Iterator))
 819                                 tb = Parent.TypeBuilder;
 820                         else
 821                                 tb = TypeBuilder;
 822
 823                         if (check_type.IsGenericInstance)
 824                                 check_type = check_type.GetGenericTypeDefinition ();
 825
 826                         if (check_type == tb)
 827                                 return true;
 828
 829                         if (TypeBuilder == null)
 830                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 831                                 //        However, this is invoked again later -- so safe to return true.
 832                                 //        May also be null when resolving top-level attributes.
 833                                 return true;
 834
 835                         if (check_type.IsGenericParameter)
 836                                 return true; // FIXME
 837
 838                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 839
 840                         //
 841                         // Broken Microsoft runtime, return public for arrays, no matter what
 842                         // the accessibility is for their underlying class, and they return
 843                         // NonPublic visibility for pointers
 844                         //
 845                         if (check_type.IsArray || check_type.IsPointer)
 846                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 847
 848                         switch (check_attr){
 849                         case TypeAttributes.Public:
 850                                 return true;
 851
 852                         case TypeAttributes.NotPublic:
 853
 854                                 if (TypeBuilder == null)
 855                                         // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 856                                         //        However, this is invoked again later -- so safe to return true.
 857                                         //        May also be null when resolving top-level attributes.
 858                                         return true;
 859                                 //
 860                                 // This test should probably use the declaringtype.
 861                                 //
 862                                 return check_type.Assembly == TypeBuilder.Assembly;
 863
 864                         case TypeAttributes.NestedPublic:
 865                                 return true;
 866
 867                         case TypeAttributes.NestedPrivate:
 868                                 return NestedAccessible (tb, check_type);
 869
 870                         case TypeAttributes.NestedFamily:
 871                                 //
 872                                 // Only accessible to methods in current type or any subtypes
 873                                 //
 874                                 return FamilyAccessible (tb, check_type);
 875
 876                         case TypeAttributes.NestedFamANDAssem:
 877                                 return (check_type.Assembly == tb.Assembly) &&
 878                                         FamilyAccessible (tb, check_type);
 879
 880                         case TypeAttributes.NestedFamORAssem:
 881                                 return (check_type.Assembly == tb.Assembly) ||
 882                                         FamilyAccessible (tb, check_type);
 883
 884                         case TypeAttributes.NestedAssembly:
 885                                 return check_type.Assembly == tb.Assembly;
 886                         }
 887
 888                         Console.WriteLine ("HERE: " + check_attr);
 889                         return false;
 890
 891                 }
 892
 893                 protected bool NestedAccessible (Type tb, Type check_type)
 894                 {
 895                         Type declaring = check_type.DeclaringType;
 896                         return TypeBuilder == declaring ||
 897                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 898                 }
 899
 900                 protected bool FamilyAccessible (Type tb, Type check_type)
 901                 {
 902                         Type declaring = check_type.DeclaringType;
 903                         if (tb == declaring || TypeManager.IsFamilyAccessible (tb, declaring))
 904                                 return true;
 905
 906                         return NestedAccessible (tb, check_type);
 907                 }
 908
 909                 // Access level of a type.
 910                 const int X = 1;
 911                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 912                         // Public    Assembly   Protected
 913                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 914                         Public              = (X << 0) | (X << 1) | (X << 2),
 915                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 916                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 917                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 918                 }
 919
 920                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 921                 {
 922                         if ((flags & Modifiers.INTERNAL) != 0) {
 923
 924                                 if ((flags & Modifiers.PROTECTED) != 0)
 925                                         return AccessLevel.ProtectedOrInternal;
 926                                 else
 927                                         return AccessLevel.Internal;
 928
 929                         } else if ((flags & Modifiers.PROTECTED) != 0)
 930                                 return AccessLevel.Protected;
 931                         else if ((flags & Modifiers.PRIVATE) != 0)
 932                                 return AccessLevel.Private;
 933                         else
 934                                 return AccessLevel.Public;
 935                 }
 936
 937                 // What is the effective access level of this?
 938                 // TODO: Cache this?
 939                 AccessLevel EffectiveAccessLevel {
 940                         get {
 941                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 942                                 if (!IsTopLevel && (Parent != null))
 943                                         return myAccess & Parent.EffectiveAccessLevel;
 944                                 return myAccess;
 945                         }
 946                 }
 947
 948                 // Return the access level for type `t'
 949                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 950                 {
 951                         if (t.IsPublic)
 952                                 return AccessLevel.Public;
 953                         if (t.IsNestedPrivate)
 954                                 return AccessLevel.Private;
 955                         if (t.IsNotPublic)
 956                                 return AccessLevel.Internal;
 957
 958                         // By now, it must be nested
 959                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
 960
 961                         if (t.IsNestedPublic)
 962                                 return parentLevel;
 963                         if (t.IsNestedAssembly)
 964                                 return parentLevel & AccessLevel.Internal;
 965                         if (t.IsNestedFamily)
 966                                 return parentLevel & AccessLevel.Protected;
 967                         if (t.IsNestedFamORAssem)
 968                                 return parentLevel & AccessLevel.ProtectedOrInternal;
 969                         if (t.IsNestedFamANDAssem)
 970                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 971
 972                         // nested private is taken care of
 973
 974                         throw new Exception ("I give up, what are you?");
 975                 }
 976
 977                 //
 978                 // This answers `is the type P, as accessible as a member M which has the
 979                 // accessability @flags which is declared as a nested member of the type T, this declspace'
 980                 //
 981                 public bool AsAccessible (Type p, int flags)
 982                 {
 983                         if (p.IsGenericParameter)
 984                                 return true; // FIXME
 985
 986                         //
 987                         // 1) if M is private, its accessability is the same as this declspace.
 988                         // we already know that P is accessible to T before this method, so we
 989                         // may return true.
 990                         //
 991
 992                         if ((flags & Modifiers.PRIVATE) != 0)
 993                                 return true;
 994
 995                         while (p.IsArray || p.IsPointer || p.IsByRef)
 996                                 p = TypeManager.GetElementType (p);
 997
 998                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
 999                         AccessLevel mAccess = this.EffectiveAccessLevel &
1000                                 GetAccessLevelFromModifiers (flags);
1001
1002                         // for every place from which we can access M, we must
1003                         // be able to access P as well. So, we want
1004                         // For every bit in M and P, M_i -> P_1 == true
1005                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
1006
1007                         return ~ (~ mAccess | pAccess) == 0;
1008                 }
1009
1010                 public static void Error_AmbiguousTypeReference (Location loc, string name, string t1, string t2)
1011                 {
1012                         Report.Error (104, loc,
1013                                       "`{0}' is an ambiguous reference ({1} or {2})",
1014                                       name, t1, t2);
1015                 }
1016
1017                 //
1018                 // Return the nested type with name @name.  Ensures that the nested type
1019                 // is defined if necessary.  Do _not_ use this when you have a MemberCache handy.
1020                 //
1021                 public virtual Type FindNestedType (string name)
1022                 {
1023                         return null;
1024                 }
1025
1026                 private Type LookupNestedTypeInHierarchy (string name)
1027                 {
1028                         // if the member cache has been created, lets use it.
1029                         // the member cache is MUCH faster.
1030                         if (MemberCache != null)
1031                                 return MemberCache.FindNestedType (name);
1032
1033                         // no member cache. Do it the hard way -- reflection
1034                         Type t = null;
1035                         for (Type current_type = TypeBuilder;
1036                              current_type != null && current_type != TypeManager.object_type;
1037                              current_type = current_type.BaseType) {
1038                                 if (current_type is TypeBuilder) {
1039                                         DeclSpace decl = this;
1040                                         if (current_type != TypeBuilder)
1041                                                 decl = TypeManager.LookupDeclSpace (current_type);
1042                                         t = decl.FindNestedType (name);
1043                                 } else {
1044                                         t = TypeManager.GetNestedType (current_type, name);
1045                                 }
1046
1047                                 if (t != null && CheckAccessLevel (t))
1048                                         return t;
1049                         }
1050
1051                         return null;
1052                 }
1053
1054                 //
1055                 // Public function used to locate types, this can only
1056                 // be used after the ResolveTree function has been invoked.
1057                 //
1058                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1059                 //
1060                 // Returns: Type or null if they type can not be found.
1061                 //
1062                 public FullNamedExpression LookupType (string name, Location loc, bool ignore_cs0104)
1063                 {
1064                         if (this is PartialContainer)
1065                                 throw new InternalErrorException ("Should not get here");
1066
1067                         if (Cache.Contains (name))
1068                                 return (FullNamedExpression) Cache [name];
1069
1070                         FullNamedExpression e;
1071                         Type t = LookupNestedTypeInHierarchy (name);
1072                         if (t != null)
1073                                 e = new TypeExpression (t, Location.Null);
1074                         else if (Parent != null && Parent != RootContext.Tree.Types)
1075                                 e = Parent.LookupType (name, loc, ignore_cs0104);
1076                         else
1077                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
1078
1079                         Cache [name] = e;
1080                         return e;
1081                 }
1082
1083                 /// <remarks>
1084                 ///   This function is broken and not what you're looking for.  It should only
1085                 ///   be used while the type is still being created since it doesn't use the cache
1086                 ///   and relies on the filter doing the member name check.
1087                 /// </remarks>
1088                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1089                                                         MemberFilter filter, object criteria);
1090
1091                 /// <remarks>
1092                 ///   If we have a MemberCache, return it.  This property may return null if the
1093                 ///   class doesn't have a member cache or while it's still being created.
1094                 /// </remarks>
1095                 public abstract MemberCache MemberCache {
1096                         get;
1097                 }
1098
1099                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1100                 {
1101                         if (a.Type == TypeManager.required_attr_type) {
1102                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1103                                 return;
1104                         }
1105                         TypeBuilder.SetCustomAttribute (cb);
1106                 }
1107
1108                 /// <summary>
1109                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
1110                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
1111                 /// </summary>
1112                 public bool GetClsCompliantAttributeValue ()
1113                 {
1114                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
1115                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
1116
1117                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
1118
1119                         if (OptAttributes != null) {
1120                                 Attribute cls_attribute = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, ec);
1121                                 if (cls_attribute != null) {
1122                                         caching_flags |= Flags.HasClsCompliantAttribute;
1123                                         if (cls_attribute.GetClsCompliantAttributeValue (ec)) {
1124                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1125                                                 return true;
1126                                         }
1127                                         return false;
1128                                 }
1129                         }
1130
1131                         if (Parent == null) {
1132                                 if (CodeGen.Assembly.IsClsCompliant) {
1133                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
1134                                         return true;
1135                                 }
1136                                 return false;
1137                         }
1138
1139                         if (Parent.GetClsCompliantAttributeValue ()) {
1140                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1141                                 return true;
1142                         }
1143                         return false;
1144                 }
1145
1146                 //
1147                 // Extensions for generics
1148                 //
1149                 TypeParameter[] type_params;
1150                 TypeParameter[] type_param_list;
1151
1152                 protected string GetInstantiationName ()
1153                 {
1154                         StringBuilder sb = new StringBuilder (Name);
1155                         sb.Append ("<");
1156                         for (int i = 0; i < type_param_list.Length; i++) {
1157                                 if (i > 0)
1158                                         sb.Append (",");
1159                                 sb.Append (type_param_list [i].Name);
1160                         }
1161                         sb.Append (">");
1162                         return sb.ToString ();
1163                 }
1164
1165                 bool check_type_parameter (ArrayList list, int start, string name)
1166                 {
1167                         for (int i = 0; i < start; i++) {
1168                                 TypeParameter param = (TypeParameter) list [i];
1169
1170                                 if (param.Name != name)
1171                                         continue;
1172
1173                                 if (RootContext.WarningLevel >= 3)
1174                                         Report.Warning (
1175                                                 693, Location,
1176                                                 "Type parameter `{0}' has same name " +
1177                                                 "as type parameter from outer type `{1}'",
1178                                                 name, Parent.GetInstantiationName ());
1179
1180                                 return false;
1181                         }
1182
1183                         return true;
1184                 }
1185
1186                 TypeParameter[] initialize_type_params ()
1187                 {
1188                         if (type_param_list != null)
1189                                 return type_param_list;
1190
1191                         DeclSpace the_parent = Parent;
1192                         if (this is GenericMethod)
1193                                 the_parent = null;
1194
1195                         int start = 0;
1196                         TypeParameter[] parent_params = null;
1197                         if ((the_parent != null) && the_parent.IsGeneric) {
1198                                 parent_params = the_parent.initialize_type_params ();
1199                                 start = parent_params != null ? parent_params.Length : 0;
1200                         }
1201
1202                         ArrayList list = new ArrayList ();
1203                         if (parent_params != null)
1204                                 list.AddRange (parent_params);
1205
1206                         int count = type_params != null ? type_params.Length : 0;
1207                         for (int i = 0; i < count; i++) {
1208                                 TypeParameter param = type_params [i];
1209                                 check_type_parameter (list, start, param.Name);
1210                                 list.Add (param);
1211                         }
1212
1213                         type_param_list = new TypeParameter [list.Count];
1214                         list.CopyTo (type_param_list, 0);
1215                         return type_param_list;
1216                 }
1217
1218                 public virtual void SetParameterInfo (ArrayList constraints_list)
1219                 {
1220                         if (!is_generic) {
1221                                 if (constraints_list != null) {
1222                                         Report.Error (
1223                                                 80, Location, "Contraints are not allowed " +
1224                                                 "on non-generic declarations");
1225                                 }
1226
1227                                 return;
1228                         }
1229
1230                         string[] names = MemberName.TypeArguments.GetDeclarations ();
1231                         type_params = new TypeParameter [names.Length];
1232
1233                         //
1234                         // Register all the names
1235                         //
1236                         for (int i = 0; i < type_params.Length; i++) {
1237                                 string name = names [i];
1238
1239                                 Constraints constraints = null;
1240                                 if (constraints_list != null) {
1241                                         foreach (Constraints constraint in constraints_list) {
1242                                                 if (constraint.TypeParameter == name) {
1243                                                         constraints = constraint;
1244                                                         break;
1245                                                 }
1246                                         }
1247                                 }
1248
1249                                 type_params [i] = new TypeParameter (Parent, name, constraints, Location);
1250
1251                                 AddToContainer (type_params [i], name);
1252                         }
1253                 }
1254
1255                 public TypeParameter[] TypeParameters {
1256                         get {
1257                                 if (!IsGeneric)
1258                                         throw new InvalidOperationException ();
1259                                 if (type_param_list == null)
1260                                         initialize_type_params ();
1261
1262                                 return type_param_list;
1263                         }
1264                 }
1265
1266                 protected TypeParameter[] CurrentTypeParameters {
1267                         get {
1268                                 if (!IsGeneric)
1269                                         throw new InvalidOperationException ();
1270                                 if (type_params != null)
1271                                         return type_params;
1272                                 else
1273                                         return new TypeParameter [0];
1274                         }
1275                 }
1276
1277                 public int CountTypeParameters {
1278                         get {
1279                                 return count_type_params;
1280                         }
1281                 }
1282
1283                 public int CountCurrentTypeParameters {
1284                         get {
1285                                 return count_current_type_params;
1286                         }
1287                 }
1288
1289                 public TypeParameterExpr LookupGeneric (string name, Location loc)
1290                 {
1291                         if (!IsGeneric)
1292                                 return null;
1293
1294                         foreach (TypeParameter type_param in CurrentTypeParameters) {
1295                                 if (type_param.Name != name)
1296                                         continue;
1297
1298                                 return new TypeParameterExpr (type_param, loc);
1299                         }
1300
1301                         if (Parent != null)
1302                                 return Parent.LookupGeneric (name, loc);
1303
1304                         return null;
1305                 }
1306
1307                 bool IAlias.IsType {
1308                         get { return true; }
1309                 }
1310
1311                 string IAlias.Name {
1312                         get { return Name; }
1313                 }
1314
1315                 TypeExpr IAlias.ResolveAsType (EmitContext ec)
1316                 {
1317                         if (TypeBuilder == null)
1318                                 throw new InvalidOperationException ();
1319
1320                         if (CurrentType != null)
1321                                 return new TypeExpression (CurrentType, Location);
1322                         else
1323                                 return new TypeExpression (TypeBuilder, Location);
1324                 }
1325
1326                 public override string[] ValidAttributeTargets {
1327                         get {
1328                                 return attribute_targets;
1329                         }
1330                 }
1331         }
1332
1333         /// <summary>
1334         ///   This is a readonly list of MemberInfo's.
1335         /// </summary>
1336         public class MemberList : IList {
1337                 public readonly IList List;
1338                 int count;
1339
1340                 /// <summary>
1341                 ///   Create a new MemberList from the given IList.
1342                 /// </summary>
1343                 public MemberList (IList list)
1344                 {
1345                         if (list != null)
1346                                 this.List = list;
1347                         else
1348                                 this.List = new ArrayList ();
1349                         count = List.Count;
1350                 }
1351
1352                 /// <summary>
1353                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1354                 /// </summary>
1355                 public MemberList (IList first, IList second)
1356                 {
1357                         ArrayList list = new ArrayList ();
1358                         list.AddRange (first);
1359                         list.AddRange (second);
1360                         count = list.Count;
1361                         List = list;
1362                 }
1363
1364                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1365
1366                 /// <summary>
1367                 ///   Cast the MemberList into a MemberInfo[] array.
1368                 /// </summary>
1369                 /// <remarks>
1370                 ///   This is an expensive operation, only use it if it's really necessary.
1371                 /// </remarks>
1372                 public static explicit operator MemberInfo [] (MemberList list)
1373                 {
1374                         Timer.StartTimer (TimerType.MiscTimer);
1375                         MemberInfo [] result = new MemberInfo [list.Count];
1376                         list.CopyTo (result, 0);
1377                         Timer.StopTimer (TimerType.MiscTimer);
1378                         return result;
1379                 }
1380
1381                 // ICollection
1382
1383                 public int Count {
1384                         get {
1385                                 return count;
1386                         }
1387                 }
1388
1389                 public bool IsSynchronized {
1390                         get {
1391                                 return List.IsSynchronized;
1392                         }
1393                 }
1394
1395                 public object SyncRoot {
1396                         get {
1397                                 return List.SyncRoot;
1398                         }
1399                 }
1400
1401                 public void CopyTo (Array array, int index)
1402                 {
1403                         List.CopyTo (array, index);
1404                 }
1405
1406                 // IEnumerable
1407
1408                 public IEnumerator GetEnumerator ()
1409                 {
1410                         return List.GetEnumerator ();
1411                 }
1412
1413                 // IList
1414
1415                 public bool IsFixedSize {
1416                         get {
1417                                 return true;
1418                         }
1419                 }
1420
1421                 public bool IsReadOnly {
1422                         get {
1423                                 return true;
1424                         }
1425                 }
1426
1427                 object IList.this [int index] {
1428                         get {
1429                                 return List [index];
1430                         }
1431
1432                         set {
1433                                 throw new NotSupportedException ();
1434                         }
1435                 }
1436
1437                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1438                 public MemberInfo this [int index] {
1439                         get {
1440                                 return (MemberInfo) List [index];
1441                         }
1442                 }
1443
1444                 public int Add (object value)
1445                 {
1446                         throw new NotSupportedException ();
1447                 }
1448
1449                 public void Clear ()
1450                 {
1451                         throw new NotSupportedException ();
1452                 }
1453
1454                 public bool Contains (object value)
1455                 {
1456                         return List.Contains (value);
1457                 }
1458
1459                 public int IndexOf (object value)
1460                 {
1461                         return List.IndexOf (value);
1462                 }
1463
1464                 public void Insert (int index, object value)
1465                 {
1466                         throw new NotSupportedException ();
1467                 }
1468
1469                 public void Remove (object value)
1470                 {
1471                         throw new NotSupportedException ();
1472                 }
1473
1474                 public void RemoveAt (int index)
1475                 {
1476                         throw new NotSupportedException ();
1477                 }
1478         }
1479
1480         /// <summary>
1481         ///   This interface is used to get all members of a class when creating the
1482         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1483         ///   want to support the member cache and by TypeHandle to get caching of
1484         ///   non-dynamic types.
1485         /// </summary>
1486         public interface IMemberContainer {
1487                 /// <summary>
1488                 ///   The name of the IMemberContainer.  This is only used for
1489                 ///   debugging purposes.
1490                 /// </summary>
1491                 string Name {
1492                         get;
1493                 }
1494
1495                 /// <summary>
1496                 ///   The type of this IMemberContainer.
1497                 /// </summary>
1498                 Type Type {
1499                         get;
1500                 }
1501
1502                 /// <summary>
1503                 ///   Returns the IMemberContainer of the base class or null if this
1504                 ///   is an interface or TypeManger.object_type.
1505                 ///   This is used when creating the member cache for a class to get all
1506                 ///   members from the base class.
1507                 /// </summary>
1508                 MemberCache BaseCache {
1509                         get;
1510                 }
1511
1512                 /// <summary>
1513                 ///   Whether this is an interface.
1514                 /// </summary>
1515                 bool IsInterface {
1516                         get;
1517                 }
1518
1519                 /// <summary>
1520                 ///   Returns all members of this class with the corresponding MemberTypes
1521                 ///   and BindingFlags.
1522                 /// </summary>
1523                 /// <remarks>
1524                 ///   When implementing this method, make sure not to return any inherited
1525                 ///   members and check the MemberTypes and BindingFlags properly.
1526                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1527                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1528                 ///   MemberInfo class, but the cache needs this information.  That's why
1529                 ///   this method is called multiple times with different BindingFlags.
1530                 /// </remarks>
1531                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1532
1533                 /// <summary>
1534                 ///   Return the container's member cache.
1535                 /// </summary>
1536                 MemberCache MemberCache {
1537                         get;
1538                 }
1539         }
1540
1541         /// <summary>
1542         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1543         ///   member lookups.  It has a member name based hash table; it maps each member
1544         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1545         ///   and the BindingFlags that were initially used to get it.  The cache contains
1546         ///   all members of the current class and all inherited members.  If this cache is
1547         ///   for an interface types, it also contains all inherited members.
1548         ///
1549         ///   There are two ways to get a MemberCache:
1550         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1551         ///     use the DeclSpace.MemberCache property.
1552         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1553         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1554         /// </summary>
1555         public class MemberCache {
1556                 public readonly IMemberContainer Container;
1557                 protected Hashtable member_hash;
1558                 protected Hashtable method_hash;
1559
1560                 /// <summary>
1561                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1562                 /// </summary>
1563                 public MemberCache (IMemberContainer container)
1564                 {
1565                         this.Container = container;
1566
1567                         Timer.IncrementCounter (CounterType.MemberCache);
1568                         Timer.StartTimer (TimerType.CacheInit);
1569
1570                         // If we have a base class (we have a base class unless we're
1571                         // TypeManager.object_type), we deep-copy its MemberCache here.
1572                         if (Container.BaseCache != null)
1573                                 member_hash = SetupCache (Container.BaseCache);
1574                         else
1575                                 member_hash = new Hashtable ();
1576
1577                         // If this is neither a dynamic type nor an interface, create a special
1578                         // method cache with all declared and inherited methods.
1579                         Type type = container.Type;
1580                         if (!(type is TypeBuilder) && !type.IsInterface &&
1581                             // !(type.IsGenericInstance && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
1582                             !type.IsGenericInstance &&
1583                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1584                                 method_hash = new Hashtable ();
1585                                 AddMethods (type);
1586                         }
1587
1588                         // Add all members from the current class.
1589                         AddMembers (Container);
1590
1591                         Timer.StopTimer (TimerType.CacheInit);
1592                 }
1593
1594                 public MemberCache (Type[] ifaces)
1595                 {
1596                         //
1597                         // The members of this cache all belong to other caches.
1598                         // So, 'Container' will not be used.
1599                         //
1600                         this.Container = null;
1601
1602                         member_hash = new Hashtable ();
1603                         if (ifaces == null)
1604                                 return;
1605
1606                         foreach (Type itype in ifaces)
1607                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1608                 }
1609
1610                 /// <summary>
1611                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1612                 /// </summary>
1613                 Hashtable SetupCache (MemberCache base_class)
1614                 {
1615                         Hashtable hash = new Hashtable ();
1616
1617                         if (base_class == null)
1618                                 return hash;
1619
1620                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1621                         while (it.MoveNext ()) {
1622                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1623                          }
1624
1625                         return hash;
1626                 }
1627
1628                 void ClearDeclaredOnly (Hashtable hash)
1629                 {
1630                         IDictionaryEnumerator it = hash.GetEnumerator ();
1631                         while (it.MoveNext ()) {
1632                                 foreach (CacheEntry ce in (ArrayList) it.Value)
1633                                         ce.EntryType &= ~EntryType.Declared;
1634                         }
1635                 }
1636
1637                 /// <summary>
1638                 ///   Add the contents of `cache' to the member_hash.
1639                 /// </summary>
1640                 void AddCacheContents (MemberCache cache)
1641                 {
1642                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1643                         while (it.MoveNext ()) {
1644                                 ArrayList list = (ArrayList) member_hash [it.Key];
1645                                 if (list == null)
1646                                         member_hash [it.Key] = list = new ArrayList ();
1647
1648                                 ArrayList entries = (ArrayList) it.Value;
1649                                 for (int i = entries.Count-1; i >= 0; i--) {
1650                                         CacheEntry entry = (CacheEntry) entries [i];
1651
1652                                         if (entry.Container != cache.Container)
1653                                                 break;
1654                                         list.Add (entry);
1655                                 }
1656                         }
1657                 }
1658
1659                 /// <summary>
1660                 ///   Add all members from class `container' to the cache.
1661                 /// </summary>
1662                 void AddMembers (IMemberContainer container)
1663                 {
1664                         // We need to call AddMembers() with a single member type at a time
1665                         // to get the member type part of CacheEntry.EntryType right.
1666                         if (!container.IsInterface) {
1667                         AddMembers (MemberTypes.Constructor, container);
1668                         AddMembers (MemberTypes.Field, container);
1669                         }
1670                         AddMembers (MemberTypes.Method, container);
1671                         AddMembers (MemberTypes.Property, container);
1672                         AddMembers (MemberTypes.Event, container);
1673                         // Nested types are returned by both Static and Instance searches.
1674                         AddMembers (MemberTypes.NestedType,
1675                                     BindingFlags.Static | BindingFlags.Public, container);
1676                         AddMembers (MemberTypes.NestedType,
1677                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1678                 }
1679
1680                 void AddMembers (MemberTypes mt, IMemberContainer container)
1681                 {
1682                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1683                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1684                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1685                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1686                 }
1687
1688                 /// <summary>
1689                 ///   Add all members from class `container' with the requested MemberTypes and
1690                 ///   BindingFlags to the cache.  This method is called multiple times with different
1691                 ///   MemberTypes and BindingFlags.
1692                 /// </summary>
1693                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1694                 {
1695                         MemberList members = container.GetMembers (mt, bf);
1696
1697                         foreach (MemberInfo member in members) {
1698                                 string name = member.Name;
1699
1700                                 int pos = name.IndexOf ('<');
1701                                 if (pos > 0)
1702                                         name = name.Substring (0, pos);
1703
1704                                 // We use a name-based hash table of ArrayList's.
1705                                 ArrayList list = (ArrayList) member_hash [name];
1706                                 if (list == null) {
1707                                         list = new ArrayList ();
1708                                         member_hash.Add (name, list);
1709                                 }
1710
1711                                 // When this method is called for the current class, the list will
1712                                 // already contain all inherited members from our base classes.
1713                                 // We cannot add new members in front of the list since this'd be an
1714                                 // expensive operation, that's why the list is sorted in reverse order
1715                                 // (ie. members from the current class are coming last).
1716                                 list.Add (new CacheEntry (container, member, mt, bf));
1717                         }
1718                 }
1719
1720                 /// <summary>
1721                 ///   Add all declared and inherited methods from class `type' to the method cache.
1722                 /// </summary>
1723                 void AddMethods (Type type)
1724                 {
1725                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1726                                     BindingFlags.FlattenHierarchy, type);
1727                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1728                                     BindingFlags.FlattenHierarchy, type);
1729                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1730                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1731                 }
1732
1733                 void AddMethods (BindingFlags bf, Type type)
1734                 {
1735                         //
1736                         // Consider the case:
1737                         //
1738                         //   class X { public virtual int f() {} }
1739                         //   class Y : X {}
1740                         //
1741                         // When processing 'Y', the method_cache will already have a copy of 'f',
1742                         // with ReflectedType == X.  However, we want to ensure that its ReflectedType == Y
1743                         //
1744                         MethodBase [] members = type.GetMethods (bf);
1745
1746                         Array.Reverse (members);
1747
1748                         foreach (MethodBase member in members) {
1749                                 string name = member.Name;
1750
1751                                 // We use a name-based hash table of ArrayList's.
1752                                 ArrayList list = (ArrayList) method_hash [name];
1753                                 if (list == null) {
1754                                         list = new ArrayList ();
1755                                         method_hash.Add (name, list);
1756                                 }
1757
1758                                 MethodInfo curr = (MethodInfo) member;
1759                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1760                                         MethodInfo base_method = curr.GetBaseDefinition ();
1761
1762                                         if (base_method == curr) {
1763                                                 //
1764                                                 // Both mcs and CSC 1.1 seem to emit a somewhat broken
1765                                                 // ...Invoke () function for delegates: it's missing a 'newslot'.
1766                                                 // CSC 2.0 emits a 'newslot' for a delegate's Invoke.
1767                                                 //
1768                                                 // Also, CSC 1.1 appears to emit 'Finalize' without a newslot.
1769                                                 //
1770                                                 if ((member.Name == "Invoke" && TypeManager.IsDelegateType (type)) ||
1771                                                     (member.Name == "Finalize" && member.GetParameters().Length == 0))
1772                                                         break;
1773
1774                                                 Report.SymbolRelatedToPreviousError (base_method);
1775                                                 Report.Warning (-28,
1776                                                                 "The method '{0}' is marked 'override'," +
1777                                                                 " but doesn't appear to override any virtual or abstract method:" +
1778                                                                 " it may be ignored during overload resolution",
1779                                                                 TypeManager.CSharpSignature (base_method));
1780                                                 break;
1781                                         }
1782
1783                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1784                                         curr = base_method;
1785                                 }
1786
1787                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1788                                 // sorted so we need to do this check for every member.
1789                                 BindingFlags new_bf = bf;
1790                                 if (member.DeclaringType == type)
1791                                         new_bf |= BindingFlags.DeclaredOnly;
1792
1793                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1794                         }
1795                 }
1796
1797                 /// <summary>
1798                 ///   Compute and return a appropriate `EntryType' magic number for the given
1799                 ///   MemberTypes and BindingFlags.
1800                 /// </summary>
1801                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1802                 {
1803                         EntryType type = EntryType.None;
1804
1805                         if ((mt & MemberTypes.Constructor) != 0)
1806                                 type |= EntryType.Constructor;
1807                         if ((mt & MemberTypes.Event) != 0)
1808                                 type |= EntryType.Event;
1809                         if ((mt & MemberTypes.Field) != 0)
1810                                 type |= EntryType.Field;
1811                         if ((mt & MemberTypes.Method) != 0)
1812                                 type |= EntryType.Method;
1813                         if ((mt & MemberTypes.Property) != 0)
1814                                 type |= EntryType.Property;
1815                         // Nested types are returned by static and instance searches.
1816                         if ((mt & MemberTypes.NestedType) != 0)
1817                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1818
1819                         if ((bf & BindingFlags.Instance) != 0)
1820                                 type |= EntryType.Instance;
1821                         if ((bf & BindingFlags.Static) != 0)
1822                                 type |= EntryType.Static;
1823                         if ((bf & BindingFlags.Public) != 0)
1824                                 type |= EntryType.Public;
1825                         if ((bf & BindingFlags.NonPublic) != 0)
1826                                 type |= EntryType.NonPublic;
1827                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1828                                 type |= EntryType.Declared;
1829
1830                         return type;
1831                 }
1832
1833                 /// <summary>
1834                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1835                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1836                 ///   single member types.
1837                 /// </summary>
1838                 public static bool IsSingleMemberType (MemberTypes mt)
1839                 {
1840                         switch (mt) {
1841                         case MemberTypes.Constructor:
1842                         case MemberTypes.Event:
1843                         case MemberTypes.Field:
1844                         case MemberTypes.Method:
1845                         case MemberTypes.Property:
1846                         case MemberTypes.NestedType:
1847                                 return true;
1848
1849                         default:
1850                                 return false;
1851                         }
1852                 }
1853
1854                 /// <summary>
1855                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1856                 ///   number to speed up the searching process.
1857                 /// </summary>
1858                 [Flags]
1859                 protected enum EntryType {
1860                         None            = 0x000,
1861
1862                         Instance        = 0x001,
1863                         Static          = 0x002,
1864                         MaskStatic      = Instance|Static,
1865
1866                         Public          = 0x004,
1867                         NonPublic       = 0x008,
1868                         MaskProtection  = Public|NonPublic,
1869
1870                         Declared        = 0x010,
1871
1872                         Constructor     = 0x020,
1873                         Event           = 0x040,
1874                         Field           = 0x080,
1875                         Method          = 0x100,
1876                         Property        = 0x200,
1877                         NestedType      = 0x400,
1878
1879                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1880                 }
1881
1882                 protected class CacheEntry {
1883                         public readonly IMemberContainer Container;
1884                         public EntryType EntryType;
1885                         public MemberInfo Member;
1886
1887                         public CacheEntry (IMemberContainer container, MemberInfo member,
1888                                            MemberTypes mt, BindingFlags bf)
1889                         {
1890                                 this.Container = container;
1891                                 this.Member = member;
1892                                 this.EntryType = GetEntryType (mt, bf);
1893                         }
1894
1895                         public override string ToString ()
1896                         {
1897                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1898                                                       EntryType, Member);
1899                         }
1900                 }
1901
1902                 /// <summary>
1903                 ///   This is called each time we're walking up one level in the class hierarchy
1904                 ///   and checks whether we can abort the search since we've already found what
1905                 ///   we were looking for.
1906                 /// </summary>
1907                 protected bool DoneSearching (ArrayList list)
1908                 {
1909                         //
1910                         // We've found exactly one member in the current class and it's not
1911                         // a method or constructor.
1912                         //
1913                         if (list.Count == 1 && !(list [0] is MethodBase))
1914                                 return true;
1915
1916                         //
1917                         // Multiple properties: we query those just to find out the indexer
1918                         // name
1919                         //
1920                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1921                                 return true;
1922
1923                         return false;
1924                 }
1925
1926                 /// <summary>
1927                 ///   Looks up members with name `name'.  If you provide an optional
1928                 ///   filter function, it'll only be called with members matching the
1929                 ///   requested member name.
1930                 ///
1931                 ///   This method will try to use the cache to do the lookup if possible.
1932                 ///
1933                 ///   Unlike other FindMembers implementations, this method will always
1934                 ///   check all inherited members - even when called on an interface type.
1935                 ///
1936                 ///   If you know that you're only looking for methods, you should use
1937                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1938                 ///   When doing a method-only search, it'll try to use a special method
1939                 ///   cache (unless it's a dynamic type or an interface) and the returned
1940                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1941                 ///   The lookup process will automatically restart itself in method-only
1942                 ///   search mode if it discovers that it's about to return methods.
1943                 /// </summary>
1944                 ArrayList global = new ArrayList ();
1945                 bool using_global = false;
1946
1947                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1948
1949                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1950                                                MemberFilter filter, object criteria)
1951                 {
1952                         if (using_global)
1953                                 throw new Exception ();
1954
1955                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1956                         bool method_search = mt == MemberTypes.Method;
1957                         // If we have a method cache and we aren't already doing a method-only search,
1958                         // then we restart a method search if the first match is a method.
1959                         bool do_method_search = !method_search && (method_hash != null);
1960
1961                         ArrayList applicable;
1962
1963                         // If this is a method-only search, we try to use the method cache if
1964                         // possible; a lookup in the method cache will return a MemberInfo with
1965                         // the correct ReflectedType for inherited methods.
1966
1967                         if (method_search && (method_hash != null))
1968                                 applicable = (ArrayList) method_hash [name];
1969                         else
1970                                 applicable = (ArrayList) member_hash [name];
1971
1972                         if (applicable == null)
1973                                 return emptyMemberInfo;
1974
1975                         //
1976                         // 32  slots gives 53 rss/54 size
1977                         // 2/4 slots gives 55 rss
1978                         //
1979                         // Strange: from 25,000 calls, only 1,800
1980                         // are above 2.  Why does this impact it?
1981                         //
1982                         global.Clear ();
1983                         using_global = true;
1984
1985                         Timer.StartTimer (TimerType.CachedLookup);
1986
1987                         EntryType type = GetEntryType (mt, bf);
1988
1989                         IMemberContainer current = Container;
1990
1991
1992                         // `applicable' is a list of all members with the given member name `name'
1993                         // in the current class and all its base classes.  The list is sorted in
1994                         // reverse order due to the way how the cache is initialy created (to speed
1995                         // things up, we're doing a deep-copy of our base).
1996
1997                         for (int i = applicable.Count-1; i >= 0; i--) {
1998                                 CacheEntry entry = (CacheEntry) applicable [i];
1999
2000                                 // This happens each time we're walking one level up in the class
2001                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
2002                                 // the first time this happens (this may already happen in the first
2003                                 // iteration of this loop if there are no members with the name we're
2004                                 // looking for in the current class).
2005                                 if (entry.Container != current) {
2006                                         if (declared_only || DoneSearching (global))
2007                                                 break;
2008
2009                                         current = entry.Container;
2010                                 }
2011
2012                                 // Is the member of the correct type ?
2013                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2014                                         continue;
2015
2016                                 // Is the member static/non-static ?
2017                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2018                                         continue;
2019
2020                                 // Apply the filter to it.
2021                                 if (filter (entry.Member, criteria)) {
2022                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
2023                                                 do_method_search = false;
2024                                         global.Add (entry.Member);
2025                                 }
2026                         }
2027
2028                         Timer.StopTimer (TimerType.CachedLookup);
2029
2030                         // If we have a method cache and we aren't already doing a method-only
2031                         // search, we restart in method-only search mode if the first match is
2032                         // a method.  This ensures that we return a MemberInfo with the correct
2033                         // ReflectedType for inherited methods.
2034                         if (do_method_search && (global.Count > 0)){
2035                                 using_global = false;
2036
2037                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2038                         }
2039
2040                         using_global = false;
2041                         MemberInfo [] copy = new MemberInfo [global.Count];
2042                         global.CopyTo (copy);
2043                         return copy;
2044                 }
2045
2046                 // find the nested type @name in @this.
2047                 public Type FindNestedType (string name)
2048                 {
2049                         ArrayList applicable = (ArrayList) member_hash [name];
2050                         if (applicable == null)
2051                                 return null;
2052
2053                         for (int i = applicable.Count-1; i >= 0; i--) {
2054                                 CacheEntry entry = (CacheEntry) applicable [i];
2055                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
2056                                         return (Type) entry.Member;
2057                         }
2058
2059                         return null;
2060                 }
2061
2062                 //
2063                 // This finds the method or property for us to override. invocationType is the type where
2064                 // the override is going to be declared, name is the name of the method/property, and
2065                 // paramTypes is the parameters, if any to the method or property
2066                 //
2067                 // Because the MemberCache holds members from this class and all the base classes,
2068                 // we can avoid tons of reflection stuff.
2069                 //
2070                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
2071                 {
2072                         ArrayList applicable;
2073                         if (method_hash != null && !is_property)
2074                                 applicable = (ArrayList) method_hash [name];
2075                         else
2076                                 applicable = (ArrayList) member_hash [name];
2077
2078                         if (applicable == null)
2079                                 return null;
2080                         //
2081                         // Walk the chain of methods, starting from the top.
2082                         //
2083                         for (int i = applicable.Count - 1; i >= 0; i--) {
2084                                 CacheEntry entry = (CacheEntry) applicable [i];
2085
2086                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2087                                         continue;
2088
2089                                 PropertyInfo pi = null;
2090                                 MethodInfo mi = null;
2091                                 FieldInfo fi = null;
2092                                 Type [] cmpAttrs = null;
2093
2094                                 if (is_property) {
2095                                         if ((entry.EntryType & EntryType.Field) != 0) {
2096                                                 fi = (FieldInfo)entry.Member;
2097
2098                                                 // TODO: For this case we ignore member type
2099                                                 //fb = TypeManager.GetField (fi);
2100                                                 //cmpAttrs = new Type[] { fb.MemberType };
2101                                         } else {
2102                                                 pi = (PropertyInfo) entry.Member;
2103                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
2104                                         }
2105                                 } else {
2106                                         mi = (MethodInfo) entry.Member;
2107                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
2108                                 }
2109
2110                                 if (fi != null) {
2111                                         // TODO: Almost duplicate !
2112                                         // Check visibility
2113                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2114                                                 case FieldAttributes.Private:
2115                                                         //
2116                                                         // A private method is Ok if we are a nested subtype.
2117                                                         // The spec actually is not very clear about this, see bug 52458.
2118                                                         //
2119                                                         if (invocationType != entry.Container.Type &
2120                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2121                                                                 continue;
2122
2123                                                         break;
2124                                                 case FieldAttributes.FamANDAssem:
2125                                                 case FieldAttributes.Assembly:
2126                                                         //
2127                                                         // Check for assembly methods
2128                                                         //
2129                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2130                                                                 continue;
2131                                                         break;
2132                                         }
2133                                         return entry.Member;
2134                                 }
2135
2136                                 //
2137                                 // Check the arguments
2138                                 //
2139                                 if (cmpAttrs.Length != paramTypes.Length)
2140                                         continue;
2141
2142                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --) {
2143                                         if (!TypeManager.IsEqual (paramTypes [j], cmpAttrs [j]))
2144                                                 goto next;
2145                                 }
2146
2147                                 //
2148                                 // get one of the methods because this has the visibility info.
2149                                 //
2150                                 if (is_property) {
2151                                         mi = pi.GetGetMethod (true);
2152                                         if (mi == null)
2153                                                 mi = pi.GetSetMethod (true);
2154                                 }
2155
2156                                 //
2157                                 // Check visibility
2158                                 //
2159                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2160                                 case MethodAttributes.Private:
2161                                         //
2162                                         // A private method is Ok if we are a nested subtype.
2163                                         // The spec actually is not very clear about this, see bug 52458.
2164                                         //
2165                                         if (invocationType.Equals (entry.Container.Type) ||
2166                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2167                                                 return entry.Member;
2168
2169                                         break;
2170                                 case MethodAttributes.FamANDAssem:
2171                                 case MethodAttributes.Assembly:
2172                                         //
2173                                         // Check for assembly methods
2174                                         //
2175                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
2176                                                 return entry.Member;
2177
2178                                         break;
2179                                 default:
2180                                         //
2181                                         // A protected method is ok, because we are overriding.
2182                                         // public is always ok.
2183                                         //
2184                                         return entry.Member;
2185                                 }
2186                         next:
2187                                 ;
2188                         }
2189
2190                         return null;
2191                 }
2192
2193                 /// <summary>
2194                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2195                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2196                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2197                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2198                 /// </summary>
2199                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2200                 {
2201                         ArrayList applicable = null;
2202
2203                         if (method_hash != null)
2204                                 applicable = (ArrayList) method_hash [name];
2205
2206                         if (applicable != null) {
2207                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2208                                         CacheEntry entry = (CacheEntry) applicable [i];
2209                                         if ((entry.EntryType & EntryType.Public) != 0)
2210                                                 return entry.Member;
2211                                 }
2212                         }
2213
2214                         if (member_hash == null)
2215                                 return null;
2216                         applicable = (ArrayList) member_hash [name];
2217
2218                         if (applicable != null) {
2219                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2220                                         CacheEntry entry = (CacheEntry) applicable [i];
2221                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2222                                                 if (ignore_complex_types) {
2223                                                         if ((entry.EntryType & EntryType.Method) != 0)
2224                                                                 continue;
2225
2226                                                         // Does exist easier way how to detect indexer ?
2227                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2228                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
2229                                                                 if (arg_types.Length > 0)
2230                                                                         continue;
2231                                                         }
2232                                                 }
2233                                                 return entry.Member;
2234                                         }
2235                                 }
2236                         }
2237                         return null;
2238                 }
2239
2240                 Hashtable locase_table;
2241
2242                 /// <summary>
2243                 /// Builds low-case table for CLS Compliance test
2244                 /// </summary>
2245                 public Hashtable GetPublicMembers ()
2246                 {
2247                         if (locase_table != null)
2248                                 return locase_table;
2249
2250                         locase_table = new Hashtable ();
2251                         foreach (DictionaryEntry entry in member_hash) {
2252                                 ArrayList members = (ArrayList)entry.Value;
2253                                 for (int ii = 0; ii < members.Count; ++ii) {
2254                                         CacheEntry member_entry = (CacheEntry) members [ii];
2255
2256                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2257                                                 continue;
2258
2259                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2260                                         switch (member_entry.EntryType & EntryType.MaskType) {
2261                                                 case EntryType.Constructor:
2262                                                         continue;
2263
2264                                                 case EntryType.Field:
2265                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2266                                                                 continue;
2267                                                         break;
2268
2269                                                 case EntryType.Method:
2270                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2271                                                                 continue;
2272                                                         break;
2273
2274                                                 case EntryType.Property:
2275                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
2276                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2277                                                                 continue;
2278                                                         break;
2279
2280                                                 case EntryType.Event:
2281                                                         EventInfo ei = (EventInfo)member_entry.Member;
2282                                                         MethodInfo mi = ei.GetAddMethod ();
2283                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2284                                                                 continue;
2285                                                         break;
2286                                         }
2287                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2288                                         locase_table [lcase] = member_entry.Member;
2289                                         break;
2290                                 }
2291                         }
2292                         return locase_table;
2293                 }
2294
2295                 public Hashtable Members {
2296                         get {
2297                                 return member_hash;
2298                         }
2299                 }
2300
2301                 /// <summary>
2302                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2303                 /// </summary>
2304                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2305                 {
2306                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2307
2308                         for (int i = 0; i < al.Count; ++i) {
2309                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2310
2311                                 // skip itself
2312                                 if (entry.Member == this_builder)
2313                                         continue;
2314
2315                                 if ((entry.EntryType & tested_type) != tested_type)
2316                                         continue;
2317
2318                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2319                                 if (AttributeTester.AreOverloadedMethodParamsClsCompliant (method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare)))
2320                                         continue;
2321
2322                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2323
2324                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2325                                 // However it is exactly what csc does.
2326                                 if (md != null && !md.IsClsCompliaceRequired (method.Parent))
2327                                         continue;
2328
2329                                 Report.SymbolRelatedToPreviousError (entry.Member);
2330                                 Report.Error (3006, method.Location, "Overloaded method '{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2331                         }
2332                 }
2333         }
2334 }