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                 public readonly Location Location;
  31
  32                 public static readonly MemberName Null = new MemberName ("", Location.Null);
  33
  34                 bool is_double_colon;
  35
  36                 private MemberName (MemberName left, string name, bool is_double_colon,
  37                                     TypeArguments args, Location loc)
  38                 {
  39                         this.Name = name;
  40                         this.Location = loc;
  41                         this.is_double_colon = is_double_colon;
  42                         this.TypeArguments = args;
  43                         this.Left = left;
  44                 }
  45
  46                 public MemberName (string name, TypeArguments args, Location loc)
  47                         : this (name, loc)
  48                 {
  49                         this.TypeArguments = args;
  50                 }
  51
  52                 public MemberName (string name, Location loc)
  53                 {
  54                         this.Name = name;
  55                         this.Location = loc;
  56                 }
  57
  58                 public MemberName (MemberName left, string name, Location loc)
  59                         : this (name, loc)
  60                 {
  61                         this.Left = left;
  62                 }
  63
  64                 public MemberName (MemberName left, string name, TypeArguments args, Location loc)
  65                         : this (name, args, loc)
  66                 {
  67                         this.Left = left;
  68                 }
  69
  70                 public MemberName (string alias, string name, Location loc)
  71                         : this (new MemberName (alias, loc), name, true, null, loc)
  72                 {
  73                 }
  74
  75                 public MemberName (MemberName left, MemberName right)
  76                         : this (left, right, left != null ? left.Location : right != null ? right.Location : Location.Null)
  77                 {
  78                 }
  79
  80                 public MemberName (MemberName left, MemberName right, Location loc)
  81                         : this (null, right.Name, false, right.TypeArguments, loc)
  82                 {
  83                         if (right.is_double_colon)
  84                                 throw new InternalErrorException ("Cannot append double_colon member name");
  85                         this.Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  86                 }
  87
  88                 static readonly char [] dot_array = { '.' };
  89
  90                 public static MemberName FromDotted (string name, Location loc)
  91                 {
  92                         string [] elements = name.Split (dot_array);
  93                         int count = elements.Length;
  94                         int i = 0;
  95                         MemberName n = new MemberName (elements [i++], loc);
  96                         while (i < count)
  97                                 n = new MemberName (n, elements [i++], loc);
  98                         return n;
  99                 }
 100
 101                 public string GetName ()
 102                 {
 103                         string connect = is_double_colon ? "::" : ".";
 104                         if (Left != null)
 105                                 return Left.GetName () + connect + Name;
 106                         else
 107                                 return Name;
 108                 }
 109
 110                 public bool IsGeneric {
 111                         get {
 112                                 if (TypeArguments != null)
 113                                         return true;
 114                                 else if (Left != null)
 115                                         return Left.IsGeneric;
 116                                 else
 117                                         return false;
 118                         }
 119                 }
 120
 121                 public string GetName (bool is_generic)
 122                 {
 123                         string name = is_generic ? Basename : Name;
 124                         string connect = is_double_colon ? "::" : ".";
 125                         if (Left != null)
 126                                 return Left.GetName (is_generic) + connect + name;
 127                         else
 128                                 return name;
 129                 }
 130
 131                 public int CountTypeArguments {
 132                         get {
 133                                 if (TypeArguments == null)
 134                                         return 0;
 135                                 else
 136                                         return TypeArguments.Count;
 137                         }
 138                 }
 139
 140                 public string MethodName {
 141                         get {
 142                                 string connect = is_double_colon ? "::" : ".";
 143                                 if (Left != null)
 144                                         return Left.FullName + connect + Name;
 145                                 else
 146                                         return Name;
 147                         }
 148                 }
 149
 150                 public static string MakeName (string name, TypeArguments args)
 151                 {
 152                         if (args == null)
 153                                 return name;
 154                         else
 155                                 return name + "`" + args.Count;
 156                 }
 157
 158                 public static string MakeName (string name, int count)
 159                 {
 160                         return name + "`" + count;
 161                 }
 162
 163                 public string GetTypeName ()
 164                 {
 165                         string connect = is_double_colon ? "::" : ".";
 166                         if (Left != null)
 167                                 return Left.GetTypeName () + connect +
 168                                         MakeName (Name, TypeArguments);
 169                         else
 170                                 return MakeName (Name, TypeArguments);
 171                 }
 172
 173                 protected bool IsUnbound {
 174                         get {
 175                                 if ((Left != null) && Left.IsUnbound)
 176                                         return true;
 177                                 else if (TypeArguments == null)
 178                                         return false;
 179                                 else
 180                                         return TypeArguments.IsUnbound;
 181                         }
 182                 }
 183
 184                 protected bool CheckUnbound (Location loc)
 185                 {
 186                         if ((Left != null) && !Left.CheckUnbound (loc))
 187                                 return false;
 188                         if ((TypeArguments != null) && !TypeArguments.IsUnbound) {
 189                                 Report.Error (1031, loc, "Type expected");
 190                                 return false;
 191                         }
 192
 193                         return true;
 194                 }
 195
 196                 public Expression GetTypeExpression ()
 197                 {
 198                         if (IsUnbound) {
 199                                 if (!CheckUnbound (Location))
 200                                         return null;
 201
 202                                 return new UnboundTypeExpression (this, Location);
 203                         }
 204
 205                         if (Left == null) {
 206                                 if (TypeArguments != null)
 207                                         return new SimpleName (Basename, TypeArguments, Location);
 208                                 else
 209                                         return new SimpleName (Name, Location);
 210                         }
 211
 212                         if (is_double_colon) {
 213                                 if (Left.Left != null)
 214                                         throw new InternalErrorException ("The left side of a :: should be an identifier");
 215                                 return new QualifiedAliasMember (Left.Name, Name, Location);
 216                         }
 217
 218                         Expression lexpr = Left.GetTypeExpression ();
 219                         return new MemberAccess (lexpr, Name, TypeArguments, Location);
 220                 }
 221
 222                 public MemberName Clone ()
 223                 {
 224                         MemberName left_clone = Left == null ? null : Left.Clone ();
 225                         return new MemberName (left_clone, Name, is_double_colon, TypeArguments, Location);
 226                 }
 227
 228                 public string Basename {
 229                         get {
 230                                 if (TypeArguments != null)
 231                                         return MakeName (Name, TypeArguments);
 232                                 else
 233                                         return Name;
 234                         }
 235                 }
 236
 237                 public string FullName {
 238                         get {
 239                                 if (TypeArguments != null)
 240                                         return Name + "<" + TypeArguments + ">";
 241                                 else
 242                                         return Name;
 243                         }
 244                 }
 245
 246                 public override string ToString ()
 247                 {
 248                         string connect = is_double_colon ? "::" : ".";
 249                         if (Left != null)
 250                                 return Left.FullName + connect + FullName;
 251                         else
 252                                 return FullName;
 253                 }
 254
 255                 public override bool Equals (object other)
 256                 {
 257                         return Equals (other as MemberName);
 258                 }
 259
 260                 public bool Equals (MemberName other)
 261                 {
 262                         if (this == other)
 263                                 return true;
 264                         if (other == null || Name != other.Name)
 265                                 return false;
 266                         if (is_double_colon != other.is_double_colon)
 267                                 return false;
 268
 269                         if ((TypeArguments != null) &&
 270                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 271                                 return false;
 272
 273                         if ((TypeArguments == null) && (other.TypeArguments != null))
 274                                 return false;
 275
 276                         if (Left == null)
 277                                 return other.Left == null;
 278
 279                         return Left.Equals (other.Left);
 280                 }
 281
 282                 public override int GetHashCode ()
 283                 {
 284                         int hash = Name.GetHashCode ();
 285                         for (MemberName n = Left; n != null; n = n.Left)
 286                                 hash ^= n.Name.GetHashCode ();
 287                         if (is_double_colon)
 288                                 hash ^= 0xbadc01d;
 289
 290                         if (TypeArguments != null)
 291                                 hash ^= TypeArguments.Count << 5;
 292
 293                         return hash & 0x7FFFFFFF;
 294                 }
 295         }
 296
 297         /// <summary>
 298         ///   Base representation for members.  This is used to keep track
 299         ///   of Name, Location and Modifier flags, and handling Attributes.
 300         /// </summary>
 301         public abstract class MemberCore : Attributable {
 302                 /// <summary>
 303                 ///   Public name
 304                 /// </summary>
 305
 306                 protected string cached_name;
 307                 public string Name {
 308                         get {
 309                                 if (cached_name == null)
 310                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 311                                 return cached_name;
 312                         }
 313                 }
 314
 315                 // Is not readonly because of IndexerName attribute
 316                 private MemberName member_name;
 317                 public MemberName MemberName {
 318                         get { return member_name; }
 319                 }
 320
 321                 /// <summary>
 322                 ///   Modifier flags that the user specified in the source code
 323                 /// </summary>
 324                 public int ModFlags;
 325
 326                 public /*readonly*/ TypeContainer Parent;
 327
 328                 /// <summary>
 329                 ///   Location where this declaration happens
 330                 /// </summary>
 331                 public Location Location {
 332                         get { return member_name.Location; }
 333                 }
 334
 335                 /// <summary>
 336                 ///   XML documentation comment
 337                 /// </summary>
 338                 public string DocComment;
 339
 340                 /// <summary>
 341                 ///   Represents header string for documentation comment
 342                 ///   for each member types.
 343                 /// </summary>
 344                 public abstract string DocCommentHeader { get; }
 345
 346                 [Flags]
 347                 public enum Flags {
 348                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 349                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 350                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 351                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 352                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 353                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 354                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 355                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 356                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 357                         Excluded = 1 << 9,                                      // Method is conditional
 358                         TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
 359                         IsUsed = 1 << 11,
 360                         IsAssigned = 1 << 12                            // Field is assigned
 361                 }
 362
 363                 /// <summary>
 364                 ///   MemberCore flags at first detected then cached
 365                 /// </summary>
 366                 internal Flags caching_flags;
 367
 368                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs)
 369                         : base (attrs)
 370                 {
 371                         if (parent is PartialContainer && !(this is PartialContainer))
 372                                 throw new InternalErrorException ("A PartialContainer cannot be the direct parent of a member");
 373
 374                         Parent = parent;
 375                         member_name = name;
 376                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 377                 }
 378
 379                 protected virtual void SetMemberName (MemberName new_name)
 380                 {
 381                         member_name = new_name;
 382                         cached_name = null;
 383                 }
 384
 385                 public abstract bool Define ();
 386
 387                 //
 388                 // Returns full member name for error message
 389                 //
 390                 public virtual string GetSignatureForError ()
 391                 {
 392                         if (Parent == null || Parent.Parent == null)
 393                                 return Name;
 394
 395                         return String.Concat (Parent.GetSignatureForError (), '.', Name);
 396                 }
 397
 398                 /// <summary>
 399                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 400                 /// </summary>
 401                 public virtual void Emit ()
 402                 {
 403                         if (!RootContext.VerifyClsCompliance)
 404                                 return;
 405
 406                         VerifyClsCompliance (Parent);
 407                 }
 408
 409                 public virtual EmitContext EmitContext
 410                 {
 411                         get {
 412                                 return Parent.EmitContext;
 413                         }
 414                 }
 415
 416                 public bool InUnsafe {
 417                         get {
 418                                 return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
 419                         }
 420                 }
 421
 422                 public virtual bool IsUsed {
 423                         get {
 424                                 return (caching_flags & Flags.IsUsed) != 0;
 425                         }
 426                 }
 427
 428                 public void SetMemberIsUsed ()
 429                 {
 430                         caching_flags |= Flags.IsUsed;
 431                 }
 432
 433                 //
 434                 // Whehter is it ok to use an unsafe pointer in this type container
 435                 //
 436                 public bool UnsafeOK (DeclSpace parent)
 437                 {
 438                         //
 439                         // First check if this MemberCore modifier flags has unsafe set
 440                         //
 441                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 442                                 return true;
 443
 444                         if (parent.UnsafeContext)
 445                                 return true;
 446
 447                         Expression.UnsafeError (Location);
 448                         return false;
 449                 }
 450
 451                 /// <summary>
 452                 /// Returns instance of ObsoleteAttribute for this MemberCore
 453                 /// </summary>
 454                 public virtual ObsoleteAttribute GetObsoleteAttribute ()
 455                 {
 456                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 457                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 458                                 return null;
 459                         }
 460
 461                         caching_flags &= ~Flags.Obsolete_Undetected;
 462
 463                         if (OptAttributes == null)
 464                                 return null;
 465
 466                         Attribute obsolete_attr = OptAttributes.Search (
 467                                 TypeManager.obsolete_attribute_type, EmitContext);
 468                         if (obsolete_attr == null)
 469                                 return null;
 470
 471                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (EmitContext);
 472                         if (obsolete == null)
 473                                 return null;
 474
 475                         caching_flags |= Flags.Obsolete;
 476                         return obsolete;
 477                 }
 478
 479                 /// <summary>
 480                 /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
 481                 /// </summary>
 482                 public virtual void CheckObsoleteness (Location loc)
 483                 {
 484                         if (Parent != null)
 485                                 Parent.CheckObsoleteness (loc);
 486
 487                         ObsoleteAttribute oa = GetObsoleteAttribute ();
 488                         if (oa == null) {
 489                                 return;
 490                         }
 491
 492                         AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc);
 493                 }
 494
 495                 protected void CheckObsoleteType (Expression type)
 496                 {
 497                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type.Type);
 498                         if (obsolete_attr == null)
 499                                 return;
 500
 501                         if (GetObsoleteAttribute () != null || Parent.GetObsoleteAttribute () != null)
 502                                 return;
 503
 504                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, TypeManager.CSharpName (type.Type), type.Location);
 505                 }
 506
 507                 /// <summary>
 508                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 509                 /// </summary>
 510                 public override bool IsClsComplianceRequired (DeclSpace container)
 511                 {
 512                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 513                                 return (caching_flags & Flags.ClsCompliant) != 0;
 514
 515                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 516                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 517                                 caching_flags |= Flags.ClsCompliant;
 518                                 return true;
 519                         }
 520
 521                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 522                         return false;
 523                 }
 524
 525                 /// <summary>
 526                 /// Returns true when MemberCore is exposed from assembly.
 527                 /// </summary>
 528                 public bool IsExposedFromAssembly (DeclSpace ds)
 529                 {
 530                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 531                                 return false;
 532
 533                         DeclSpace parentContainer = ds;
 534                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 535                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 536                                         return false;
 537                                 parentContainer = parentContainer.Parent;
 538                         }
 539                         return true;
 540                 }
 541
 542                 /// <summary>
 543                 /// Resolve CLSCompliantAttribute value or gets cached value.
 544                 /// </summary>
 545                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 546                 {
 547                         if (OptAttributes != null) {
 548                                 Attribute cls_attribute = OptAttributes.Search (
 549                                         TypeManager.cls_compliant_attribute_type, ds.EmitContext);
 550                                 if (cls_attribute != null) {
 551                                         caching_flags |= Flags.HasClsCompliantAttribute;
 552                                         return cls_attribute.GetClsCompliantAttributeValue (ds.EmitContext);
 553                                 }
 554                         }
 555                         return ds.GetClsCompliantAttributeValue ();
 556                 }
 557
 558                 /// <summary>
 559                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 560                 /// </summary>
 561                 protected bool HasClsCompliantAttribute {
 562                         get {
 563                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 564                         }
 565                 }
 566
 567                 /// <summary>
 568                 /// It helps to handle error 102 & 111 detection
 569                 /// </summary>
 570                 public virtual bool MarkForDuplicationCheck ()
 571                 {
 572                         return false;
 573                 }
 574
 575                 /// <summary>
 576                 /// The main virtual method for CLS-Compliant verifications.
 577                 /// The method returns true if member is CLS-Compliant and false if member is not
 578                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 579                 /// and add their extra verifications.
 580                 /// </summary>
 581                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 582                 {
 583                         if (!IsClsComplianceRequired (ds)) {
 584                                 if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
 585                                         if (!IsExposedFromAssembly (ds))
 586                                                 Report.Warning (3019, Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
 587                                         if (!CodeGen.Assembly.IsClsCompliant)
 588                                                 Report.Warning (3021, Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
 589                                 }
 590                                 return false;
 591                         }
 592
 593                         if (!CodeGen.Assembly.IsClsCompliant) {
 594                                 if (HasClsCompliantAttribute) {
 595                                         Report.Error (3014, Location,
 596                                                 "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 597                                                 GetSignatureForError ());
 598                                 }
 599                                 return false;
 600                         }
 601
 602                         if (member_name.Name [0] == '_') {
 603                                 Report.Error (3008, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 604                         }
 605                         return true;
 606                 }
 607
 608                 //
 609                 // Raised (and passed an XmlElement that contains the comment)
 610                 // when GenerateDocComment is writing documentation expectedly.
 611                 //
 612                 internal virtual void OnGenerateDocComment (DeclSpace ds, XmlElement intermediateNode)
 613                 {
 614                 }
 615
 616                 //
 617                 // Returns a string that represents the signature for this
 618                 // member which should be used in XML documentation.
 619                 //
 620                 public virtual string GetDocCommentName (DeclSpace ds)
 621                 {
 622                         if (ds == null || this is DeclSpace)
 623                                 return DocCommentHeader + Name;
 624                         else
 625                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 626                 }
 627
 628                 //
 629                 // Generates xml doc comments (if any), and if required,
 630                 // handle warning report.
 631                 //
 632                 internal virtual void GenerateDocComment (DeclSpace ds)
 633                 {
 634                         DocUtil.GenerateDocComment (this, ds);
 635                 }
 636         }
 637
 638         /// <summary>
 639         ///   Base class for structs, classes, enumerations and interfaces.
 640         /// </summary>
 641         /// <remarks>
 642         ///   They all create new declaration spaces.  This
 643         ///   provides the common foundation for managing those name
 644         ///   spaces.
 645         /// </remarks>
 646         public abstract class DeclSpace : MemberCore {
 647                 /// <summary>
 648                 ///   This points to the actual definition that is being
 649                 ///   created with System.Reflection.Emit
 650                 /// </summary>
 651                 public TypeBuilder TypeBuilder;
 652
 653                 /// <summary>
 654                 ///   If we are a generic type, this is the type we are
 655                 ///   currently defining.  We need to lookup members on this
 656                 ///   instead of the TypeBuilder.
 657                 /// </summary>
 658                 public Type CurrentType;
 659
 660                 //
 661                 // This is the namespace in which this typecontainer
 662                 // was declared.  We use this to resolve names.
 663                 //
 664                 public NamespaceEntry NamespaceEntry;
 665
 666                 private Hashtable Cache = new Hashtable ();
 667
 668                 public readonly string Basename;
 669
 670                 protected Hashtable defined_names;
 671
 672                 readonly bool is_generic;
 673                 readonly int count_type_params;
 674                 readonly int count_current_type_params;
 675
 676                 // The emit context for toplevel objects.
 677                 protected EmitContext ec;
 678
 679                 public override EmitContext EmitContext {
 680                         get {
 681                                 return ec;
 682                         }
 683                 }
 684
 685                 //
 686                 // Whether we are Generic
 687                 //
 688                 public bool IsGeneric {
 689                         get {
 690                                 if (is_generic)
 691                                         return true;
 692                                 else if (Parent != null)
 693                                         return Parent.IsGeneric;
 694                                 else
 695                                         return false;
 696                         }
 697                 }
 698
 699                 static string[] attribute_targets = new string [] { "type" };
 700
 701                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 702                                   Attributes attrs)
 703                         : base (parent, name, attrs)
 704                 {
 705                         NamespaceEntry = ns;
 706                         Basename = name.Basename;
 707                         defined_names = new Hashtable ();
 708                         if (name.TypeArguments != null) {
 709                                 is_generic = true;
 710                                 count_type_params = count_current_type_params = name.TypeArguments.Count;
 711                         }
 712                         if (parent != null)
 713                                 count_type_params += parent.count_type_params;
 714                 }
 715
 716                 /// <summary>
 717                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 718                 /// </summary>
 719                 protected bool AddToContainer (MemberCore symbol, string name)
 720                 {
 721                         if (name == MemberName.Name && !(this is Interface) && !(this is Enum)) {
 722                                 if (symbol is TypeParameter)
 723                                         Report.Error (694, symbol.Location,
 724                                                       "Type parameter `{0}' has same name as " +
 725                                                       "containing type or method", name);
 726                                 else {
 727                                         Report.SymbolRelatedToPreviousError (this);
 728                                         Report.Error (542,  symbol.Location,
 729                                                       "`{0}': member names cannot be the same " +
 730                                                       "as their enclosing type",
 731                                                       symbol.GetSignatureForError ());
 732                                         return false;
 733                                 }
 734                         }
 735
 736                         MemberCore mc = (MemberCore) defined_names [name];
 737
 738                         if (mc == null) {
 739                                 defined_names.Add (name, symbol);
 740                                 return true;
 741                         }
 742
 743                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 744                                 return true;
 745
 746                         Report.SymbolRelatedToPreviousError (mc);
 747                         if (symbol is PartialContainer || mc is PartialContainer) {
 748                                 Report.Error (260, symbol.Location,
 749                                         "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
 750                                         name);
 751                                 return false;
 752                         }
 753
 754                         if (this is RootTypes) {
 755                                 Report.Error (101, symbol.Location,
 756                                         "The namespace `{0}' already contains a definition for `{1}'",
 757                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
 758                         } else if (symbol is TypeParameter) {
 759                                 Report.Error (692, symbol.Location,
 760                                               "Duplicate type parameter `{0}'", name);
 761                         } else {
 762                                 Report.Error (102, symbol.Location,
 763                                               "The type `{0}' already contains a definition for `{1}'",
 764                                               GetSignatureForError (), symbol.MemberName.Name);
 765                         }
 766
 767                         return false;
 768                 }
 769
 770                 /// <summary>
 771                 ///   Returns the MemberCore associated with a given name in the declaration
 772                 ///   space. It doesn't return method based symbols !!
 773                 /// </summary>
 774                 ///
 775                 public MemberCore GetDefinition (string name)
 776                 {
 777                         return (MemberCore)defined_names [name];
 778                 }
 779
 780                 //
 781                 // root_types contains all the types.  All TopLevel types
 782                 // hence have a parent that points to `root_types', that is
 783                 // why there is a non-obvious test down here.
 784                 //
 785                 public bool IsTopLevel {
 786                         get { return (Parent != null && Parent.Parent == null); }
 787                 }
 788
 789                 public virtual void CloseType ()
 790                 {
 791                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 792                                 try {
 793                                         TypeBuilder.CreateType ();
 794                                 } catch {
 795                                         //
 796                                         // The try/catch is needed because
 797                                         // nested enumerations fail to load when they
 798                                         // are defined.
 799                                         //
 800                                         // Even if this is the right order (enumerations
 801                                         // declared after types).
 802                                         //
 803                                         // Note that this still creates the type and
 804                                         // it is possible to save it
 805                                 }
 806                                 caching_flags |= Flags.CloseTypeCreated;
 807                         }
 808                 }
 809
 810                 protected virtual TypeAttributes TypeAttr {
 811                         get { return CodeGen.Module.DefaultCharSetType; }
 812                 }
 813
 814                 /// <remarks>
 815                 ///  Should be overriten by the appropriate declaration space
 816                 /// </remarks>
 817                 public abstract TypeBuilder DefineType ();
 818
 819                 /// <summary>
 820                 ///   Define all members, but don't apply any attributes or do anything which may
 821                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 822                 /// </summary>
 823                 public virtual bool DefineMembers (TypeContainer parent)
 824                 {
 825                         if (((ModFlags & Modifiers.NEW) != 0) && IsTopLevel) {
 826                                 Report.Error (1530, Location, "Keyword `new' is not allowed on namespace elements");
 827                                 return false;
 828                         }
 829                         return true;
 830                 }
 831
 832                 public override string GetSignatureForError ()
 833                 {
 834                         // Parent.GetSignatureForError
 835                         return Name;
 836                 }
 837
 838                 //
 839                 // Whether this is an `unsafe context'
 840                 //
 841                 public bool UnsafeContext {
 842                         get {
 843                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 844                                         return true;
 845                                 if (Parent != null)
 846                                         return Parent.UnsafeContext;
 847                                 return false;
 848                         }
 849                 }
 850
 851                 EmitContext type_resolve_ec;
 852                 protected EmitContext TypeResolveEmitContext {
 853                         get {
 854                                 if (type_resolve_ec == null) {
 855                                         // FIXME: I think this should really be one of:
 856                                         //
 857                                         // a. type_resolve_ec = Parent.EmitContext;
 858                                         // b. type_resolve_ec = new EmitContext (Parent, Parent, loc, null, null, ModFlags, false);
 859                                         //
 860                                         // However, if Parent == RootContext.Tree.Types, its NamespaceEntry will be null.
 861                                         //
 862                                         type_resolve_ec = new EmitContext (Parent, this, Location.Null, null, null, ModFlags, false);
 863                                 }
 864                                 return type_resolve_ec;
 865                         }
 866                 }
 867
 868                 // <summary>
 869                 //    Resolves the expression `e' for a type, and will recursively define
 870                 //    types.  This should only be used for resolving base types.
 871                 // </summary>
 872                 protected TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
 873                 {
 874                         TypeResolveEmitContext.loc = loc;
 875                         TypeResolveEmitContext.ContainerType = TypeBuilder;
 876                         TypeResolveEmitContext.ResolvingTypeTree = true;
 877                         if (this is GenericMethod)
 878                                 TypeResolveEmitContext.ContainerType = Parent.TypeBuilder;
 879                         else
 880                                 TypeResolveEmitContext.ContainerType = TypeBuilder;
 881
 882                         return e.ResolveAsTypeTerminal (TypeResolveEmitContext);
 883                 }
 884
 885                 public bool CheckAccessLevel (Type check_type)
 886                 {
 887                         TypeBuilder tb;
 888                         if ((this is GenericMethod) || (this is Iterator))
 889                                 tb = Parent.TypeBuilder;
 890                         else
 891                                 tb = TypeBuilder;
 892
 893                         if (check_type.IsGenericInstance)
 894                                 check_type = check_type.GetGenericTypeDefinition ();
 895
 896                         if (check_type == tb)
 897                                 return true;
 898
 899                         if (TypeBuilder == null)
 900                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 901                                 //        However, this is invoked again later -- so safe to return true.
 902                                 //        May also be null when resolving top-level attributes.
 903                                 return true;
 904
 905                         if (check_type.IsGenericParameter)
 906                                 return true; // FIXME
 907
 908                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 909
 910                         //
 911                         // Broken Microsoft runtime, return public for arrays, no matter what
 912                         // the accessibility is for their underlying class, and they return
 913                         // NonPublic visibility for pointers
 914                         //
 915                         if (check_type.IsArray || check_type.IsPointer)
 916                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 917
 918                         switch (check_attr){
 919                         case TypeAttributes.Public:
 920                                 return true;
 921
 922                         case TypeAttributes.NotPublic:
 923
 924                                 if (TypeBuilder == null)
 925                                         // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 926                                         //        However, this is invoked again later -- so safe to return true.
 927                                         //        May also be null when resolving top-level attributes.
 928                                         return true;
 929                                 //
 930                                 // This test should probably use the declaringtype.
 931                                 //
 932                                 return check_type.Assembly == TypeBuilder.Assembly;
 933
 934                         case TypeAttributes.NestedPublic:
 935                                 return true;
 936
 937                         case TypeAttributes.NestedPrivate:
 938                                 return NestedAccessible (tb, check_type);
 939
 940                         case TypeAttributes.NestedFamily:
 941                                 //
 942                                 // Only accessible to methods in current type or any subtypes
 943                                 //
 944                                 return FamilyAccessible (tb, check_type);
 945
 946                         case TypeAttributes.NestedFamANDAssem:
 947                                 return (check_type.Assembly == tb.Assembly) &&
 948                                         FamilyAccessible (tb, check_type);
 949
 950                         case TypeAttributes.NestedFamORAssem:
 951                                 return (check_type.Assembly == tb.Assembly) ||
 952                                         FamilyAccessible (tb, check_type);
 953
 954                         case TypeAttributes.NestedAssembly:
 955                                 return check_type.Assembly == tb.Assembly;
 956                         }
 957
 958                         Console.WriteLine ("HERE: " + check_attr);
 959                         return false;
 960
 961                 }
 962
 963                 protected bool NestedAccessible (Type tb, Type check_type)
 964                 {
 965                         Type declaring = check_type.DeclaringType;
 966                         return TypeBuilder == declaring ||
 967                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 968                 }
 969
 970                 protected bool FamilyAccessible (Type tb, Type check_type)
 971                 {
 972                         Type declaring = check_type.DeclaringType;
 973                         return TypeManager.IsNestedFamilyAccessible (TypeBuilder, declaring);
 974                 }
 975
 976                 // Access level of a type.
 977                 const int X = 1;
 978                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 979                         // Public    Assembly   Protected
 980                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 981                         Public              = (X << 0) | (X << 1) | (X << 2),
 982                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 983                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 984                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 985                 }
 986
 987                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 988                 {
 989                         if ((flags & Modifiers.INTERNAL) != 0) {
 990
 991                                 if ((flags & Modifiers.PROTECTED) != 0)
 992                                         return AccessLevel.ProtectedOrInternal;
 993                                 else
 994                                         return AccessLevel.Internal;
 995
 996                         } else if ((flags & Modifiers.PROTECTED) != 0)
 997                                 return AccessLevel.Protected;
 998                         else if ((flags & Modifiers.PRIVATE) != 0)
 999                                 return AccessLevel.Private;
1000                         else
1001                                 return AccessLevel.Public;
1002                 }
1003
1004                 // What is the effective access level of this?
1005                 // TODO: Cache this?
1006                 AccessLevel EffectiveAccessLevel {
1007                         get {
1008                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
1009                                 if (!IsTopLevel && (Parent != null))
1010                                         return myAccess & Parent.EffectiveAccessLevel;
1011                                 return myAccess;
1012                         }
1013                 }
1014
1015                 // Return the access level for type `t'
1016                 static AccessLevel TypeEffectiveAccessLevel (Type t)
1017                 {
1018                         if (t.IsPublic)
1019                                 return AccessLevel.Public;
1020                         if (t.IsNestedPrivate)
1021                                 return AccessLevel.Private;
1022                         if (t.IsNotPublic)
1023                                 return AccessLevel.Internal;
1024
1025                         // By now, it must be nested
1026                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
1027
1028                         if (t.IsNestedPublic)
1029                                 return parentLevel;
1030                         if (t.IsNestedAssembly)
1031                                 return parentLevel & AccessLevel.Internal;
1032                         if (t.IsNestedFamily)
1033                                 return parentLevel & AccessLevel.Protected;
1034                         if (t.IsNestedFamORAssem)
1035                                 return parentLevel & AccessLevel.ProtectedOrInternal;
1036                         if (t.IsNestedFamANDAssem)
1037                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
1038
1039                         // nested private is taken care of
1040
1041                         throw new Exception ("I give up, what are you?");
1042                 }
1043
1044                 //
1045                 // This answers `is the type P, as accessible as a member M which has the
1046                 // accessability @flags which is declared as a nested member of the type T, this declspace'
1047                 //
1048                 public bool AsAccessible (Type p, int flags)
1049                 {
1050                         if (p.IsGenericParameter)
1051                                 return true; // FIXME
1052
1053                         //
1054                         // 1) if M is private, its accessability is the same as this declspace.
1055                         // we already know that P is accessible to T before this method, so we
1056                         // may return true.
1057                         //
1058
1059                         if ((flags & Modifiers.PRIVATE) != 0)
1060                                 return true;
1061
1062                         while (p.IsArray || p.IsPointer || p.IsByRef)
1063                                 p = TypeManager.GetElementType (p);
1064
1065                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
1066                         AccessLevel mAccess = this.EffectiveAccessLevel &
1067                                 GetAccessLevelFromModifiers (flags);
1068
1069                         // for every place from which we can access M, we must
1070                         // be able to access P as well. So, we want
1071                         // For every bit in M and P, M_i -> P_1 == true
1072                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
1073
1074                         return ~ (~ mAccess | pAccess) == 0;
1075                 }
1076
1077                 //
1078                 // Return the nested type with name @name.  Ensures that the nested type
1079                 // is defined if necessary.  Do _not_ use this when you have a MemberCache handy.
1080                 //
1081                 public virtual Type FindNestedType (string name)
1082                 {
1083                         return null;
1084                 }
1085
1086                 private Type LookupNestedTypeInHierarchy (string name)
1087                 {
1088                         // if the member cache has been created, lets use it.
1089                         // the member cache is MUCH faster.
1090                         if (MemberCache != null)
1091                                 return MemberCache.FindNestedType (name);
1092
1093                         // no member cache. Do it the hard way -- reflection
1094                         Type t = null;
1095                         for (Type current_type = TypeBuilder;
1096                              current_type != null && current_type != TypeManager.object_type;
1097                              current_type = current_type.BaseType) {
1098                                 if (current_type.IsGenericInstance)
1099                                         current_type = current_type.GetGenericTypeDefinition ();
1100                                 if (current_type is TypeBuilder) {
1101                                         DeclSpace decl = this;
1102                                         if (current_type != TypeBuilder)
1103                                                 decl = TypeManager.LookupDeclSpace (current_type);
1104                                         t = decl.FindNestedType (name);
1105                                 } else {
1106                                         t = TypeManager.GetNestedType (current_type, name);
1107                                 }
1108
1109                                 if (t != null && CheckAccessLevel (t))
1110                                         return t;
1111                         }
1112
1113                         return null;
1114                 }
1115
1116                 //
1117                 // Public function used to locate types.
1118                 //
1119                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1120                 //
1121                 // Returns: Type or null if they type can not be found.
1122                 //
1123                 public FullNamedExpression LookupType (string name, Location loc, bool ignore_cs0104)
1124                 {
1125                         if (this is PartialContainer)
1126                                 throw new InternalErrorException ("Should not get here");
1127
1128                         if (Cache.Contains (name))
1129                                 return (FullNamedExpression) Cache [name];
1130
1131                         FullNamedExpression e;
1132                         Type t = LookupNestedTypeInHierarchy (name);
1133                         if (t != null)
1134                                 e = new TypeExpression (t, Location.Null);
1135                         else if (Parent != null && Parent != RootContext.Tree.Types)
1136                                 e = Parent.LookupType (name, loc, ignore_cs0104);
1137                         else
1138                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
1139
1140                         Cache [name] = e;
1141                         return e;
1142                 }
1143
1144                 /// <remarks>
1145                 ///   This function is broken and not what you're looking for.  It should only
1146                 ///   be used while the type is still being created since it doesn't use the cache
1147                 ///   and relies on the filter doing the member name check.
1148                 /// </remarks>
1149                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1150                                                         MemberFilter filter, object criteria);
1151
1152                 /// <remarks>
1153                 ///   If we have a MemberCache, return it.  This property may return null if the
1154                 ///   class doesn't have a member cache or while it's still being created.
1155                 /// </remarks>
1156                 public abstract MemberCache MemberCache {
1157                         get;
1158                 }
1159
1160                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1161                 {
1162                         if (a.Type == TypeManager.required_attr_type) {
1163                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1164                                 return;
1165                         }
1166                         TypeBuilder.SetCustomAttribute (cb);
1167                 }
1168
1169                 /// <summary>
1170                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
1171                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
1172                 /// </summary>
1173                 public bool GetClsCompliantAttributeValue ()
1174                 {
1175                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
1176                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
1177
1178                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
1179
1180                         if (OptAttributes != null) {
1181                                 Attribute cls_attribute = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, ec);
1182                                 if (cls_attribute != null) {
1183                                         caching_flags |= Flags.HasClsCompliantAttribute;
1184                                         if (cls_attribute.GetClsCompliantAttributeValue (ec)) {
1185                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1186                                                 return true;
1187                                         }
1188                                         return false;
1189                                 }
1190                         }
1191
1192                         if (Parent == null) {
1193                                 if (CodeGen.Assembly.IsClsCompliant) {
1194                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
1195                                         return true;
1196                                 }
1197                                 return false;
1198                         }
1199
1200                         if (Parent.GetClsCompliantAttributeValue ()) {
1201                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1202                                 return true;
1203                         }
1204                         return false;
1205                 }
1206
1207                 //
1208                 // Extensions for generics
1209                 //
1210                 TypeParameter[] type_params;
1211                 TypeParameter[] type_param_list;
1212
1213                 protected string GetInstantiationName ()
1214                 {
1215                         StringBuilder sb = new StringBuilder (Name);
1216                         sb.Append ("<");
1217                         for (int i = 0; i < type_param_list.Length; i++) {
1218                                 if (i > 0)
1219                                         sb.Append (",");
1220                                 sb.Append (type_param_list [i].Name);
1221                         }
1222                         sb.Append (">");
1223                         return sb.ToString ();
1224                 }
1225
1226                 bool check_type_parameter (ArrayList list, int start, string name)
1227                 {
1228                         for (int i = 0; i < start; i++) {
1229                                 TypeParameter param = (TypeParameter) list [i];
1230
1231                                 if (param.Name != name)
1232                                         continue;
1233
1234                                 if (RootContext.WarningLevel >= 3)
1235                                         Report.Warning (
1236                                                 693, Location,
1237                                                 "Type parameter `{0}' has same name " +
1238                                                 "as type parameter from outer type `{1}'",
1239                                                 name, Parent.GetInstantiationName ());
1240
1241                                 return false;
1242                         }
1243
1244                         return true;
1245                 }
1246
1247                 TypeParameter[] initialize_type_params ()
1248                 {
1249                         if (type_param_list != null)
1250                                 return type_param_list;
1251
1252                         DeclSpace the_parent = Parent;
1253                         if (this is GenericMethod)
1254                                 the_parent = null;
1255
1256                         int start = 0;
1257                         TypeParameter[] parent_params = null;
1258                         if ((the_parent != null) && the_parent.IsGeneric) {
1259                                 parent_params = the_parent.initialize_type_params ();
1260                                 start = parent_params != null ? parent_params.Length : 0;
1261                         }
1262
1263                         ArrayList list = new ArrayList ();
1264                         if (parent_params != null)
1265                                 list.AddRange (parent_params);
1266
1267                         int count = type_params != null ? type_params.Length : 0;
1268                         for (int i = 0; i < count; i++) {
1269                                 TypeParameter param = type_params [i];
1270                                 check_type_parameter (list, start, param.Name);
1271                                 list.Add (param);
1272                         }
1273
1274                         type_param_list = new TypeParameter [list.Count];
1275                         list.CopyTo (type_param_list, 0);
1276                         return type_param_list;
1277                 }
1278
1279                 public virtual void SetParameterInfo (ArrayList constraints_list)
1280                 {
1281                         if (!is_generic) {
1282                                 if (constraints_list != null) {
1283                                         Report.Error (
1284                                                 80, Location, "Contraints are not allowed " +
1285                                                 "on non-generic declarations");
1286                                 }
1287
1288                                 return;
1289                         }
1290
1291                         string[] names = MemberName.TypeArguments.GetDeclarations ();
1292                         type_params = new TypeParameter [names.Length];
1293
1294                         //
1295                         // Register all the names
1296                         //
1297                         for (int i = 0; i < type_params.Length; i++) {
1298                                 string name = names [i];
1299
1300                                 Constraints constraints = null;
1301                                 if (constraints_list != null) {
1302                                         foreach (Constraints constraint in constraints_list) {
1303                                                 if (constraint == null)
1304                                                         continue;
1305                                                 if (constraint.TypeParameter == name) {
1306                                                         constraints = constraint;
1307                                                         break;
1308                                                 }
1309                                         }
1310                                 }
1311
1312                                 type_params [i] = new TypeParameter (Parent, name, constraints, Location);
1313
1314                                 AddToContainer (type_params [i], name);
1315                         }
1316                 }
1317
1318                 public TypeParameter[] TypeParameters {
1319                         get {
1320                                 if (!IsGeneric)
1321                                         throw new InvalidOperationException ();
1322                                 if (type_param_list == null)
1323                                         initialize_type_params ();
1324
1325                                 return type_param_list;
1326                         }
1327                 }
1328
1329                 protected TypeParameter[] CurrentTypeParameters {
1330                         get {
1331                                 if (!IsGeneric)
1332                                         throw new InvalidOperationException ();
1333                                 if (type_params != null)
1334                                         return type_params;
1335                                 else
1336                                         return new TypeParameter [0];
1337                         }
1338                 }
1339
1340                 public int CountTypeParameters {
1341                         get {
1342                                 return count_type_params;
1343                         }
1344                 }
1345
1346                 public int CountCurrentTypeParameters {
1347                         get {
1348                                 return count_current_type_params;
1349                         }
1350                 }
1351
1352                 public TypeParameterExpr LookupGeneric (string name, Location loc)
1353                 {
1354                         if (!IsGeneric)
1355                                 return null;
1356
1357                         foreach (TypeParameter type_param in CurrentTypeParameters) {
1358                                 if (type_param.Name != name)
1359                                         continue;
1360
1361                                 return new TypeParameterExpr (type_param, loc);
1362                         }
1363
1364                         if (Parent != null)
1365                                 return Parent.LookupGeneric (name, loc);
1366
1367                         return null;
1368                 }
1369
1370                 public override string[] ValidAttributeTargets {
1371                         get { return attribute_targets; }
1372                 }
1373
1374                 protected override bool VerifyClsCompliance (DeclSpace ds)
1375                 {
1376                         if (!base.VerifyClsCompliance (ds)) {
1377                                 return false;
1378                         }
1379
1380                         IDictionary cache = TypeManager.AllClsTopLevelTypes;
1381                         string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1382                         if (!cache.Contains (lcase)) {
1383                                 cache.Add (lcase, this);
1384                                 return true;
1385                         }
1386
1387                         object val = cache [lcase];
1388                         if (val == null) {
1389                                 Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
1390                                 if (t == null)
1391                                         return true;
1392                                 Report.SymbolRelatedToPreviousError (t);
1393                         }
1394                         else {
1395                                 if (val is PartialContainer)
1396                                         return true;
1397
1398                                 Report.SymbolRelatedToPreviousError ((DeclSpace)val);
1399                         }
1400                         Report.Warning (3005, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1401                         return true;
1402                 }
1403         }
1404
1405         /// <summary>
1406         ///   This is a readonly list of MemberInfo's.
1407         /// </summary>
1408         public class MemberList : IList {
1409                 public readonly IList List;
1410                 int count;
1411
1412                 /// <summary>
1413                 ///   Create a new MemberList from the given IList.
1414                 /// </summary>
1415                 public MemberList (IList list)
1416                 {
1417                         if (list != null)
1418                                 this.List = list;
1419                         else
1420                                 this.List = new ArrayList ();
1421                         count = List.Count;
1422                 }
1423
1424                 /// <summary>
1425                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1426                 /// </summary>
1427                 public MemberList (IList first, IList second)
1428                 {
1429                         ArrayList list = new ArrayList ();
1430                         list.AddRange (first);
1431                         list.AddRange (second);
1432                         count = list.Count;
1433                         List = list;
1434                 }
1435
1436                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1437
1438                 /// <summary>
1439                 ///   Cast the MemberList into a MemberInfo[] array.
1440                 /// </summary>
1441                 /// <remarks>
1442                 ///   This is an expensive operation, only use it if it's really necessary.
1443                 /// </remarks>
1444                 public static explicit operator MemberInfo [] (MemberList list)
1445                 {
1446                         Timer.StartTimer (TimerType.MiscTimer);
1447                         MemberInfo [] result = new MemberInfo [list.Count];
1448                         list.CopyTo (result, 0);
1449                         Timer.StopTimer (TimerType.MiscTimer);
1450                         return result;
1451                 }
1452
1453                 // ICollection
1454
1455                 public int Count {
1456                         get {
1457                                 return count;
1458                         }
1459                 }
1460
1461                 public bool IsSynchronized {
1462                         get {
1463                                 return List.IsSynchronized;
1464                         }
1465                 }
1466
1467                 public object SyncRoot {
1468                         get {
1469                                 return List.SyncRoot;
1470                         }
1471                 }
1472
1473                 public void CopyTo (Array array, int index)
1474                 {
1475                         List.CopyTo (array, index);
1476                 }
1477
1478                 // IEnumerable
1479
1480                 public IEnumerator GetEnumerator ()
1481                 {
1482                         return List.GetEnumerator ();
1483                 }
1484
1485                 // IList
1486
1487                 public bool IsFixedSize {
1488                         get {
1489                                 return true;
1490                         }
1491                 }
1492
1493                 public bool IsReadOnly {
1494                         get {
1495                                 return true;
1496                         }
1497                 }
1498
1499                 object IList.this [int index] {
1500                         get {
1501                                 return List [index];
1502                         }
1503
1504                         set {
1505                                 throw new NotSupportedException ();
1506                         }
1507                 }
1508
1509                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1510                 public MemberInfo this [int index] {
1511                         get {
1512                                 return (MemberInfo) List [index];
1513                         }
1514                 }
1515
1516                 public int Add (object value)
1517                 {
1518                         throw new NotSupportedException ();
1519                 }
1520
1521                 public void Clear ()
1522                 {
1523                         throw new NotSupportedException ();
1524                 }
1525
1526                 public bool Contains (object value)
1527                 {
1528                         return List.Contains (value);
1529                 }
1530
1531                 public int IndexOf (object value)
1532                 {
1533                         return List.IndexOf (value);
1534                 }
1535
1536                 public void Insert (int index, object value)
1537                 {
1538                         throw new NotSupportedException ();
1539                 }
1540
1541                 public void Remove (object value)
1542                 {
1543                         throw new NotSupportedException ();
1544                 }
1545
1546                 public void RemoveAt (int index)
1547                 {
1548                         throw new NotSupportedException ();
1549                 }
1550         }
1551
1552         /// <summary>
1553         ///   This interface is used to get all members of a class when creating the
1554         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1555         ///   want to support the member cache and by TypeHandle to get caching of
1556         ///   non-dynamic types.
1557         /// </summary>
1558         public interface IMemberContainer {
1559                 /// <summary>
1560                 ///   The name of the IMemberContainer.  This is only used for
1561                 ///   debugging purposes.
1562                 /// </summary>
1563                 string Name {
1564                         get;
1565                 }
1566
1567                 /// <summary>
1568                 ///   The type of this IMemberContainer.
1569                 /// </summary>
1570                 Type Type {
1571                         get;
1572                 }
1573
1574                 /// <summary>
1575                 ///   Returns the IMemberContainer of the base class or null if this
1576                 ///   is an interface or TypeManger.object_type.
1577                 ///   This is used when creating the member cache for a class to get all
1578                 ///   members from the base class.
1579                 /// </summary>
1580                 MemberCache BaseCache {
1581                         get;
1582                 }
1583
1584                 /// <summary>
1585                 ///   Whether this is an interface.
1586                 /// </summary>
1587                 bool IsInterface {
1588                         get;
1589                 }
1590
1591                 /// <summary>
1592                 ///   Returns all members of this class with the corresponding MemberTypes
1593                 ///   and BindingFlags.
1594                 /// </summary>
1595                 /// <remarks>
1596                 ///   When implementing this method, make sure not to return any inherited
1597                 ///   members and check the MemberTypes and BindingFlags properly.
1598                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1599                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1600                 ///   MemberInfo class, but the cache needs this information.  That's why
1601                 ///   this method is called multiple times with different BindingFlags.
1602                 /// </remarks>
1603                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1604
1605                 /// <summary>
1606                 ///   Return the container's member cache.
1607                 /// </summary>
1608                 MemberCache MemberCache {
1609                         get;
1610                 }
1611         }
1612
1613         /// <summary>
1614         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1615         ///   member lookups.  It has a member name based hash table; it maps each member
1616         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1617         ///   and the BindingFlags that were initially used to get it.  The cache contains
1618         ///   all members of the current class and all inherited members.  If this cache is
1619         ///   for an interface types, it also contains all inherited members.
1620         ///
1621         ///   There are two ways to get a MemberCache:
1622         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1623         ///     use the DeclSpace.MemberCache property.
1624         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1625         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1626         /// </summary>
1627         public class MemberCache {
1628                 public readonly IMemberContainer Container;
1629                 protected Hashtable member_hash;
1630                 protected Hashtable method_hash;
1631
1632                 /// <summary>
1633                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1634                 /// </summary>
1635                 public MemberCache (IMemberContainer container)
1636                 {
1637                         this.Container = container;
1638
1639                         Timer.IncrementCounter (CounterType.MemberCache);
1640                         Timer.StartTimer (TimerType.CacheInit);
1641
1642                         // If we have a base class (we have a base class unless we're
1643                         // TypeManager.object_type), we deep-copy its MemberCache here.
1644                         if (Container.BaseCache != null)
1645                                 member_hash = SetupCache (Container.BaseCache);
1646                         else
1647                                 member_hash = new Hashtable ();
1648
1649                         // If this is neither a dynamic type nor an interface, create a special
1650                         // method cache with all declared and inherited methods.
1651                         Type type = container.Type;
1652                         if (!(type is TypeBuilder) && !type.IsInterface &&
1653                             // !(type.IsGenericInstance && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
1654                             !type.IsGenericInstance &&
1655                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1656                                 method_hash = new Hashtable ();
1657                                 AddMethods (type);
1658                         }
1659
1660                         // Add all members from the current class.
1661                         AddMembers (Container);
1662
1663                         Timer.StopTimer (TimerType.CacheInit);
1664                 }
1665
1666                 public MemberCache (Type[] ifaces)
1667                 {
1668                         //
1669                         // The members of this cache all belong to other caches.
1670                         // So, 'Container' will not be used.
1671                         //
1672                         this.Container = null;
1673
1674                         member_hash = new Hashtable ();
1675                         if (ifaces == null)
1676                                 return;
1677
1678                         foreach (Type itype in ifaces)
1679                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1680                 }
1681
1682                 /// <summary>
1683                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1684                 /// </summary>
1685                 Hashtable SetupCache (MemberCache base_class)
1686                 {
1687                         Hashtable hash = new Hashtable ();
1688
1689                         if (base_class == null)
1690                                 return hash;
1691
1692                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1693                         while (it.MoveNext ()) {
1694                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1695                          }
1696
1697                         return hash;
1698                 }
1699
1700                 /// <summary>
1701                 ///   Add the contents of `cache' to the member_hash.
1702                 /// </summary>
1703                 void AddCacheContents (MemberCache cache)
1704                 {
1705                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1706                         while (it.MoveNext ()) {
1707                                 ArrayList list = (ArrayList) member_hash [it.Key];
1708                                 if (list == null)
1709                                         member_hash [it.Key] = list = new ArrayList ();
1710
1711                                 ArrayList entries = (ArrayList) it.Value;
1712                                 for (int i = entries.Count-1; i >= 0; i--) {
1713                                         CacheEntry entry = (CacheEntry) entries [i];
1714
1715                                         if (entry.Container != cache.Container)
1716                                                 break;
1717                                         list.Add (entry);
1718                                 }
1719                         }
1720                 }
1721
1722                 /// <summary>
1723                 ///   Add all members from class `container' to the cache.
1724                 /// </summary>
1725                 void AddMembers (IMemberContainer container)
1726                 {
1727                         // We need to call AddMembers() with a single member type at a time
1728                         // to get the member type part of CacheEntry.EntryType right.
1729                         if (!container.IsInterface) {
1730                         AddMembers (MemberTypes.Constructor, container);
1731                         AddMembers (MemberTypes.Field, container);
1732                         }
1733                         AddMembers (MemberTypes.Method, container);
1734                         AddMembers (MemberTypes.Property, container);
1735                         AddMembers (MemberTypes.Event, container);
1736                         // Nested types are returned by both Static and Instance searches.
1737                         AddMembers (MemberTypes.NestedType,
1738                                     BindingFlags.Static | BindingFlags.Public, container);
1739                         AddMembers (MemberTypes.NestedType,
1740                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1741                 }
1742
1743                 void AddMembers (MemberTypes mt, IMemberContainer container)
1744                 {
1745                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1746                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1747                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1748                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1749                 }
1750
1751                 /// <summary>
1752                 ///   Add all members from class `container' with the requested MemberTypes and
1753                 ///   BindingFlags to the cache.  This method is called multiple times with different
1754                 ///   MemberTypes and BindingFlags.
1755                 /// </summary>
1756                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1757                 {
1758                         MemberList members = container.GetMembers (mt, bf);
1759
1760                         foreach (MemberInfo member in members) {
1761                                 string name = member.Name;
1762
1763                                 int pos = name.IndexOf ('<');
1764                                 if (pos > 0)
1765                                         name = name.Substring (0, pos);
1766
1767                                 // We use a name-based hash table of ArrayList's.
1768                                 ArrayList list = (ArrayList) member_hash [name];
1769                                 if (list == null) {
1770                                         list = new ArrayList ();
1771                                         member_hash.Add (name, list);
1772                                 }
1773
1774                                 // When this method is called for the current class, the list will
1775                                 // already contain all inherited members from our base classes.
1776                                 // We cannot add new members in front of the list since this'd be an
1777                                 // expensive operation, that's why the list is sorted in reverse order
1778                                 // (ie. members from the current class are coming last).
1779                                 list.Add (new CacheEntry (container, member, mt, bf));
1780                         }
1781                 }
1782
1783                 /// <summary>
1784                 ///   Add all declared and inherited methods from class `type' to the method cache.
1785                 /// </summary>
1786                 void AddMethods (Type type)
1787                 {
1788                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1789                                     BindingFlags.FlattenHierarchy, type);
1790                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1791                                     BindingFlags.FlattenHierarchy, type);
1792                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1793                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1794                 }
1795
1796                 static ArrayList overrides = new ArrayList ();
1797
1798                 void AddMethods (BindingFlags bf, Type type)
1799                 {
1800                         MethodBase [] members = type.GetMethods (bf);
1801
1802                         Array.Reverse (members);
1803
1804                         foreach (MethodBase member in members) {
1805                                 string name = member.Name;
1806
1807                                 // We use a name-based hash table of ArrayList's.
1808                                 ArrayList list = (ArrayList) method_hash [name];
1809                                 if (list == null) {
1810                                         list = new ArrayList ();
1811                                         method_hash.Add (name, list);
1812                                 }
1813
1814                                 MethodInfo curr = (MethodInfo) member;
1815                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1816                                         MethodInfo base_method = curr.GetBaseDefinition ();
1817
1818                                         if (base_method == curr)
1819                                                 // Not every virtual function needs to have a NewSlot flag.
1820                                                 break;
1821
1822                                         overrides.Add (curr);
1823                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1824                                         curr = base_method;
1825                                 }
1826
1827                                 if (overrides.Count > 0) {
1828                                         for (int i = 0; i < overrides.Count; ++i)
1829                                                 TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
1830                                         overrides.Clear ();
1831                                 }
1832
1833                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1834                                 // sorted so we need to do this check for every member.
1835                                 BindingFlags new_bf = bf;
1836                                 if (member.DeclaringType == type)
1837                                         new_bf |= BindingFlags.DeclaredOnly;
1838
1839                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1840                         }
1841                 }
1842
1843                 /// <summary>
1844                 ///   Compute and return a appropriate `EntryType' magic number for the given
1845                 ///   MemberTypes and BindingFlags.
1846                 /// </summary>
1847                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1848                 {
1849                         EntryType type = EntryType.None;
1850
1851                         if ((mt & MemberTypes.Constructor) != 0)
1852                                 type |= EntryType.Constructor;
1853                         if ((mt & MemberTypes.Event) != 0)
1854                                 type |= EntryType.Event;
1855                         if ((mt & MemberTypes.Field) != 0)
1856                                 type |= EntryType.Field;
1857                         if ((mt & MemberTypes.Method) != 0)
1858                                 type |= EntryType.Method;
1859                         if ((mt & MemberTypes.Property) != 0)
1860                                 type |= EntryType.Property;
1861                         // Nested types are returned by static and instance searches.
1862                         if ((mt & MemberTypes.NestedType) != 0)
1863                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1864
1865                         if ((bf & BindingFlags.Instance) != 0)
1866                                 type |= EntryType.Instance;
1867                         if ((bf & BindingFlags.Static) != 0)
1868                                 type |= EntryType.Static;
1869                         if ((bf & BindingFlags.Public) != 0)
1870                                 type |= EntryType.Public;
1871                         if ((bf & BindingFlags.NonPublic) != 0)
1872                                 type |= EntryType.NonPublic;
1873                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1874                                 type |= EntryType.Declared;
1875
1876                         return type;
1877                 }
1878
1879                 /// <summary>
1880                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1881                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1882                 ///   single member types.
1883                 /// </summary>
1884                 public static bool IsSingleMemberType (MemberTypes mt)
1885                 {
1886                         switch (mt) {
1887                         case MemberTypes.Constructor:
1888                         case MemberTypes.Event:
1889                         case MemberTypes.Field:
1890                         case MemberTypes.Method:
1891                         case MemberTypes.Property:
1892                         case MemberTypes.NestedType:
1893                                 return true;
1894
1895                         default:
1896                                 return false;
1897                         }
1898                 }
1899
1900                 /// <summary>
1901                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1902                 ///   number to speed up the searching process.
1903                 /// </summary>
1904                 [Flags]
1905                 protected enum EntryType {
1906                         None            = 0x000,
1907
1908                         Instance        = 0x001,
1909                         Static          = 0x002,
1910                         MaskStatic      = Instance|Static,
1911
1912                         Public          = 0x004,
1913                         NonPublic       = 0x008,
1914                         MaskProtection  = Public|NonPublic,
1915
1916                         Declared        = 0x010,
1917
1918                         Constructor     = 0x020,
1919                         Event           = 0x040,
1920                         Field           = 0x080,
1921                         Method          = 0x100,
1922                         Property        = 0x200,
1923                         NestedType      = 0x400,
1924
1925                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1926                 }
1927
1928                 protected class CacheEntry {
1929                         public readonly IMemberContainer Container;
1930                         public EntryType EntryType;
1931                         public MemberInfo Member;
1932
1933                         public CacheEntry (IMemberContainer container, MemberInfo member,
1934                                            MemberTypes mt, BindingFlags bf)
1935                         {
1936                                 this.Container = container;
1937                                 this.Member = member;
1938                                 this.EntryType = GetEntryType (mt, bf);
1939                         }
1940
1941                         public override string ToString ()
1942                         {
1943                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1944                                                       EntryType, Member);
1945                         }
1946                 }
1947
1948                 /// <summary>
1949                 ///   This is called each time we're walking up one level in the class hierarchy
1950                 ///   and checks whether we can abort the search since we've already found what
1951                 ///   we were looking for.
1952                 /// </summary>
1953                 protected bool DoneSearching (ArrayList list)
1954                 {
1955                         //
1956                         // We've found exactly one member in the current class and it's not
1957                         // a method or constructor.
1958                         //
1959                         if (list.Count == 1 && !(list [0] is MethodBase))
1960                                 return true;
1961
1962                         //
1963                         // Multiple properties: we query those just to find out the indexer
1964                         // name
1965                         //
1966                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1967                                 return true;
1968
1969                         return false;
1970                 }
1971
1972                 /// <summary>
1973                 ///   Looks up members with name `name'.  If you provide an optional
1974                 ///   filter function, it'll only be called with members matching the
1975                 ///   requested member name.
1976                 ///
1977                 ///   This method will try to use the cache to do the lookup if possible.
1978                 ///
1979                 ///   Unlike other FindMembers implementations, this method will always
1980                 ///   check all inherited members - even when called on an interface type.
1981                 ///
1982                 ///   If you know that you're only looking for methods, you should use
1983                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1984                 ///   When doing a method-only search, it'll try to use a special method
1985                 ///   cache (unless it's a dynamic type or an interface) and the returned
1986                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1987                 ///   The lookup process will automatically restart itself in method-only
1988                 ///   search mode if it discovers that it's about to return methods.
1989                 /// </summary>
1990                 ArrayList global = new ArrayList ();
1991                 bool using_global = false;
1992
1993                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1994
1995                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1996                                                MemberFilter filter, object criteria)
1997                 {
1998                         if (using_global)
1999                                 throw new Exception ();
2000
2001                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
2002                         bool method_search = mt == MemberTypes.Method;
2003                         // If we have a method cache and we aren't already doing a method-only search,
2004                         // then we restart a method search if the first match is a method.
2005                         bool do_method_search = !method_search && (method_hash != null);
2006
2007                         ArrayList applicable;
2008
2009                         // If this is a method-only search, we try to use the method cache if
2010                         // possible; a lookup in the method cache will return a MemberInfo with
2011                         // the correct ReflectedType for inherited methods.
2012
2013                         if (method_search && (method_hash != null))
2014                                 applicable = (ArrayList) method_hash [name];
2015                         else
2016                                 applicable = (ArrayList) member_hash [name];
2017
2018                         if (applicable == null)
2019                                 return emptyMemberInfo;
2020
2021                         //
2022                         // 32  slots gives 53 rss/54 size
2023                         // 2/4 slots gives 55 rss
2024                         //
2025                         // Strange: from 25,000 calls, only 1,800
2026                         // are above 2.  Why does this impact it?
2027                         //
2028                         global.Clear ();
2029                         using_global = true;
2030
2031                         Timer.StartTimer (TimerType.CachedLookup);
2032
2033                         EntryType type = GetEntryType (mt, bf);
2034
2035                         IMemberContainer current = Container;
2036
2037
2038                         // `applicable' is a list of all members with the given member name `name'
2039                         // in the current class and all its base classes.  The list is sorted in
2040                         // reverse order due to the way how the cache is initialy created (to speed
2041                         // things up, we're doing a deep-copy of our base).
2042
2043                         for (int i = applicable.Count-1; i >= 0; i--) {
2044                                 CacheEntry entry = (CacheEntry) applicable [i];
2045
2046                                 // This happens each time we're walking one level up in the class
2047                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
2048                                 // the first time this happens (this may already happen in the first
2049                                 // iteration of this loop if there are no members with the name we're
2050                                 // looking for in the current class).
2051                                 if (entry.Container != current) {
2052                                         if (declared_only || DoneSearching (global))
2053                                                 break;
2054
2055                                         current = entry.Container;
2056                                 }
2057
2058                                 // Is the member of the correct type ?
2059                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2060                                         continue;
2061
2062                                 // Is the member static/non-static ?
2063                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2064                                         continue;
2065
2066                                 // Apply the filter to it.
2067                                 if (filter (entry.Member, criteria)) {
2068                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
2069                                                 do_method_search = false;
2070                                         global.Add (entry.Member);
2071                                 }
2072                         }
2073
2074                         Timer.StopTimer (TimerType.CachedLookup);
2075
2076                         // If we have a method cache and we aren't already doing a method-only
2077                         // search, we restart in method-only search mode if the first match is
2078                         // a method.  This ensures that we return a MemberInfo with the correct
2079                         // ReflectedType for inherited methods.
2080                         if (do_method_search && (global.Count > 0)){
2081                                 using_global = false;
2082
2083                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2084                         }
2085
2086                         using_global = false;
2087                         MemberInfo [] copy = new MemberInfo [global.Count];
2088                         global.CopyTo (copy);
2089                         return copy;
2090                 }
2091
2092                 // find the nested type @name in @this.
2093                 public Type FindNestedType (string name)
2094                 {
2095                         ArrayList applicable = (ArrayList) member_hash [name];
2096                         if (applicable == null)
2097                                 return null;
2098
2099                         for (int i = applicable.Count-1; i >= 0; i--) {
2100                                 CacheEntry entry = (CacheEntry) applicable [i];
2101                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
2102                                         return (Type) entry.Member;
2103                         }
2104
2105                         return null;
2106                 }
2107
2108                 //
2109                 // This finds the method or property for us to override. invocationType is the type where
2110                 // the override is going to be declared, name is the name of the method/property, and
2111                 // paramTypes is the parameters, if any to the method or property
2112                 //
2113                 // Because the MemberCache holds members from this class and all the base classes,
2114                 // we can avoid tons of reflection stuff.
2115                 //
2116                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
2117                 {
2118                         ArrayList applicable;
2119                         if (method_hash != null && !is_property)
2120                                 applicable = (ArrayList) method_hash [name];
2121                         else
2122                                 applicable = (ArrayList) member_hash [name];
2123
2124                         if (applicable == null)
2125                                 return null;
2126                         //
2127                         // Walk the chain of methods, starting from the top.
2128                         //
2129                         for (int i = applicable.Count - 1; i >= 0; i--) {
2130                                 CacheEntry entry = (CacheEntry) applicable [i];
2131
2132                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2133                                         continue;
2134
2135                                 PropertyInfo pi = null;
2136                                 MethodInfo mi = null;
2137                                 FieldInfo fi = null;
2138                                 Type [] cmpAttrs = null;
2139
2140                                 if (is_property) {
2141                                         if ((entry.EntryType & EntryType.Field) != 0) {
2142                                                 fi = (FieldInfo)entry.Member;
2143
2144                                                 // TODO: For this case we ignore member type
2145                                                 //fb = TypeManager.GetField (fi);
2146                                                 //cmpAttrs = new Type[] { fb.MemberType };
2147                                         } else {
2148                                                 pi = (PropertyInfo) entry.Member;
2149                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
2150                                         }
2151                                 } else {
2152                                         mi = (MethodInfo) entry.Member;
2153                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
2154                                 }
2155
2156                                 if (fi != null) {
2157                                         // TODO: Almost duplicate !
2158                                         // Check visibility
2159                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2160                                                 case FieldAttributes.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 != entry.Container.Type &
2166                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2167                                                                 continue;
2168
2169                                                         break;
2170                                                 case FieldAttributes.FamANDAssem:
2171                                                 case FieldAttributes.Assembly:
2172                                                         //
2173                                                         // Check for assembly methods
2174                                                         //
2175                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2176                                                                 continue;
2177                                                         break;
2178                                         }
2179                                         return entry.Member;
2180                                 }
2181
2182                                 //
2183                                 // Check the arguments
2184                                 //
2185                                 if (cmpAttrs.Length != paramTypes.Length)
2186                                         continue;
2187
2188                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --) {
2189                                         if (!TypeManager.IsEqual (paramTypes [j], cmpAttrs [j]))
2190                                                 goto next;
2191                                 }
2192
2193                                 //
2194                                 // get one of the methods because this has the visibility info.
2195                                 //
2196                                 if (is_property) {
2197                                         mi = pi.GetGetMethod (true);
2198                                         if (mi == null)
2199                                                 mi = pi.GetSetMethod (true);
2200                                 }
2201
2202                                 //
2203                                 // Check visibility
2204                                 //
2205                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2206                                 case MethodAttributes.Private:
2207                                         //
2208                                         // A private method is Ok if we are a nested subtype.
2209                                         // The spec actually is not very clear about this, see bug 52458.
2210                                         //
2211                                         if (invocationType.Equals (entry.Container.Type) ||
2212                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2213                                                 return entry.Member;
2214
2215                                         break;
2216                                 case MethodAttributes.FamANDAssem:
2217                                 case MethodAttributes.Assembly:
2218                                         //
2219                                         // Check for assembly methods
2220                                         //
2221                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
2222                                                 return entry.Member;
2223
2224                                         break;
2225                                 default:
2226                                         //
2227                                         // A protected method is ok, because we are overriding.
2228                                         // public is always ok.
2229                                         //
2230                                         return entry.Member;
2231                                 }
2232                         next:
2233                                 ;
2234                         }
2235
2236                         return null;
2237                 }
2238
2239                 /// <summary>
2240                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2241                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2242                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2243                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2244                 /// </summary>
2245                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2246                 {
2247                         ArrayList applicable = null;
2248
2249                         if (method_hash != null)
2250                                 applicable = (ArrayList) method_hash [name];
2251
2252                         if (applicable != null) {
2253                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2254                                         CacheEntry entry = (CacheEntry) applicable [i];
2255                                         if ((entry.EntryType & EntryType.Public) != 0)
2256                                                 return entry.Member;
2257                                 }
2258                         }
2259
2260                         if (member_hash == null)
2261                                 return null;
2262                         applicable = (ArrayList) member_hash [name];
2263
2264                         if (applicable != null) {
2265                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2266                                         CacheEntry entry = (CacheEntry) applicable [i];
2267                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2268                                                 if (ignore_complex_types) {
2269                                                         if ((entry.EntryType & EntryType.Method) != 0)
2270                                                                 continue;
2271
2272                                                         // Does exist easier way how to detect indexer ?
2273                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2274                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
2275                                                                 if (arg_types.Length > 0)
2276                                                                         continue;
2277                                                         }
2278                                                 }
2279                                                 return entry.Member;
2280                                         }
2281                                 }
2282                         }
2283                         return null;
2284                 }
2285
2286                 Hashtable locase_table;
2287
2288                 /// <summary>
2289                 /// Builds low-case table for CLS Compliance test
2290                 /// </summary>
2291                 public Hashtable GetPublicMembers ()
2292                 {
2293                         if (locase_table != null)
2294                                 return locase_table;
2295
2296                         locase_table = new Hashtable ();
2297                         foreach (DictionaryEntry entry in member_hash) {
2298                                 ArrayList members = (ArrayList)entry.Value;
2299                                 for (int ii = 0; ii < members.Count; ++ii) {
2300                                         CacheEntry member_entry = (CacheEntry) members [ii];
2301
2302                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2303                                                 continue;
2304
2305                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2306                                         switch (member_entry.EntryType & EntryType.MaskType) {
2307                                                 case EntryType.Constructor:
2308                                                         continue;
2309
2310                                                 case EntryType.Field:
2311                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2312                                                                 continue;
2313                                                         break;
2314
2315                                                 case EntryType.Method:
2316                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2317                                                                 continue;
2318                                                         break;
2319
2320                                                 case EntryType.Property:
2321                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
2322                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2323                                                                 continue;
2324                                                         break;
2325
2326                                                 case EntryType.Event:
2327                                                         EventInfo ei = (EventInfo)member_entry.Member;
2328                                                         MethodInfo mi = ei.GetAddMethod ();
2329                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2330                                                                 continue;
2331                                                         break;
2332                                         }
2333                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2334                                         locase_table [lcase] = member_entry.Member;
2335                                         break;
2336                                 }
2337                         }
2338                         return locase_table;
2339                 }
2340
2341                 public Hashtable Members {
2342                         get {
2343                                 return member_hash;
2344                         }
2345                 }
2346
2347                 /// <summary>
2348                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2349                 /// </summary>
2350                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2351                 {
2352                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2353
2354                         for (int i = 0; i < al.Count; ++i) {
2355                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2356
2357                                 // skip itself
2358                                 if (entry.Member == this_builder)
2359                                         continue;
2360
2361                                 if ((entry.EntryType & tested_type) != tested_type)
2362                                         continue;
2363
2364                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2365                                 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
2366                                         method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare));
2367
2368                                 if (result == AttributeTester.Result.Ok)
2369                                         continue;
2370
2371                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2372
2373                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2374                                 // However it is exactly what csc does.
2375                                 if (md != null && !md.IsClsComplianceRequired (method.Parent))
2376                                         continue;
2377
2378                                 Report.SymbolRelatedToPreviousError (entry.Member);
2379                                 switch (result) {
2380                                         case AttributeTester.Result.RefOutArrayError:
2381                                                 Report.Error (3006, method.Location, "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2382                                                 continue;
2383                                         case AttributeTester.Result.ArrayArrayError:
2384                                                 Report.Error (3007, method.Location, "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant", method.GetSignatureForError ());
2385                                                 continue;
2386                                 }
2387
2388                                 throw new NotImplementedException (result.ToString ());
2389                         }
2390                 }
2391         }
2392 }