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, right.Location)
  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*/ DeclSpace 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 (DeclSpace 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                         get { return Parent.EmitContext; }
 411                 }
 412
 413                 public bool InUnsafe {
 414                         get { return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext; }
 415                 }
 416
 417                 public virtual bool IsUsed {
 418                         get { return (caching_flags & Flags.IsUsed) != 0; }
 419                 }
 420
 421                 public void SetMemberIsUsed ()
 422                 {
 423                         caching_flags |= Flags.IsUsed;
 424                 }
 425
 426                 //
 427                 // Whehter is it ok to use an unsafe pointer in this type container
 428                 //
 429                 public bool UnsafeOK (DeclSpace parent)
 430                 {
 431                         //
 432                         // First check if this MemberCore modifier flags has unsafe set
 433                         //
 434                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 435                                 return true;
 436
 437                         if (parent.UnsafeContext)
 438                                 return true;
 439
 440                         Expression.UnsafeError (Location);
 441                         return false;
 442                 }
 443
 444                 /// <summary>
 445                 /// Returns instance of ObsoleteAttribute for this MemberCore
 446                 /// </summary>
 447                 public virtual ObsoleteAttribute GetObsoleteAttribute ()
 448                 {
 449                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 450                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 451                                 return null;
 452                         }
 453
 454                         caching_flags &= ~Flags.Obsolete_Undetected;
 455
 456                         if (OptAttributes == null)
 457                                 return null;
 458
 459                         Attribute obsolete_attr = OptAttributes.Search (
 460                                 TypeManager.obsolete_attribute_type, EmitContext);
 461                         if (obsolete_attr == null)
 462                                 return null;
 463
 464                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (EmitContext);
 465                         if (obsolete == null)
 466                                 return null;
 467
 468                         caching_flags |= Flags.Obsolete;
 469                         return obsolete;
 470                 }
 471
 472                 /// <summary>
 473                 /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
 474                 /// </summary>
 475                 public virtual void CheckObsoleteness (Location loc)
 476                 {
 477                         if (Parent != null)
 478                                 Parent.CheckObsoleteness (loc);
 479
 480                         ObsoleteAttribute oa = GetObsoleteAttribute ();
 481                         if (oa == null) {
 482                                 return;
 483                         }
 484
 485                         AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc);
 486                 }
 487
 488                 protected void CheckObsoleteType (Expression type)
 489                 {
 490                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type.Type);
 491                         if (obsolete_attr == null)
 492                                 return;
 493
 494                         if (GetObsoleteAttribute () != null || Parent.GetObsoleteAttribute () != null)
 495                                 return;
 496
 497                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, TypeManager.CSharpName (type.Type), type.Location);
 498                 }
 499
 500                 /// <summary>
 501                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 502                 /// </summary>
 503                 public override bool IsClsComplianceRequired (DeclSpace container)
 504                 {
 505                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 506                                 return (caching_flags & Flags.ClsCompliant) != 0;
 507
 508                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 509                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 510                                 caching_flags |= Flags.ClsCompliant;
 511                                 return true;
 512                         }
 513
 514                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 515                         return false;
 516                 }
 517
 518                 /// <summary>
 519                 /// Returns true when MemberCore is exposed from assembly.
 520                 /// </summary>
 521                 public bool IsExposedFromAssembly (DeclSpace ds)
 522                 {
 523                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 524                                 return false;
 525
 526                         DeclSpace parentContainer = ds;
 527                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 528                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 529                                         return false;
 530                                 parentContainer = parentContainer.Parent;
 531                         }
 532                         return true;
 533                 }
 534
 535                 /// <summary>
 536                 /// Resolve CLSCompliantAttribute value or gets cached value.
 537                 /// </summary>
 538                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 539                 {
 540                         if (OptAttributes != null) {
 541                                 Attribute cls_attribute = OptAttributes.Search (
 542                                         TypeManager.cls_compliant_attribute_type, ds.EmitContext);
 543                                 if (cls_attribute != null) {
 544                                         caching_flags |= Flags.HasClsCompliantAttribute;
 545                                         return cls_attribute.GetClsCompliantAttributeValue (ds.EmitContext);
 546                                 }
 547                         }
 548                         return ds.GetClsCompliantAttributeValue ();
 549                 }
 550
 551                 /// <summary>
 552                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 553                 /// </summary>
 554                 protected bool HasClsCompliantAttribute {
 555                         get {
 556                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 557                         }
 558                 }
 559
 560                 /// <summary>
 561                 /// It helps to handle error 102 & 111 detection
 562                 /// </summary>
 563                 public virtual bool MarkForDuplicationCheck ()
 564                 {
 565                         return false;
 566                 }
 567
 568                 /// <summary>
 569                 /// The main virtual method for CLS-Compliant verifications.
 570                 /// The method returns true if member is CLS-Compliant and false if member is not
 571                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 572                 /// and add their extra verifications.
 573                 /// </summary>
 574                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 575                 {
 576                         if (!IsClsComplianceRequired (ds)) {
 577                                 if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
 578                                         if (!IsExposedFromAssembly (ds))
 579                                                 Report.Warning (3019, 2, Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
 580                                         if (!CodeGen.Assembly.IsClsCompliant)
 581                                                 Report.Warning (3021, 2, Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
 582                                 }
 583                                 return false;
 584                         }
 585
 586                         if (!CodeGen.Assembly.IsClsCompliant) {
 587                                 if (HasClsCompliantAttribute) {
 588                                         Report.Error (3014, Location,
 589                                                 "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 590                                                 GetSignatureForError ());
 591                                 }
 592                                 return false;
 593                         }
 594
 595                         if (member_name.Name [0] == '_') {
 596                                 Report.Error (3008, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 597                         }
 598                         return true;
 599                 }
 600
 601                 //
 602                 // Raised (and passed an XmlElement that contains the comment)
 603                 // when GenerateDocComment is writing documentation expectedly.
 604                 //
 605                 internal virtual void OnGenerateDocComment (DeclSpace ds, XmlElement intermediateNode)
 606                 {
 607                 }
 608
 609                 //
 610                 // Returns a string that represents the signature for this
 611                 // member which should be used in XML documentation.
 612                 //
 613                 public virtual string GetDocCommentName (DeclSpace ds)
 614                 {
 615                         if (ds == null || this is DeclSpace)
 616                                 return DocCommentHeader + Name;
 617                         else
 618                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 619                 }
 620
 621                 //
 622                 // Generates xml doc comments (if any), and if required,
 623                 // handle warning report.
 624                 //
 625                 internal virtual void GenerateDocComment (DeclSpace ds)
 626                 {
 627                         DocUtil.GenerateDocComment (this, ds);
 628                 }
 629         }
 630
 631         /// <summary>
 632         ///   Base class for structs, classes, enumerations and interfaces.
 633         /// </summary>
 634         /// <remarks>
 635         ///   They all create new declaration spaces.  This
 636         ///   provides the common foundation for managing those name
 637         ///   spaces.
 638         /// </remarks>
 639         public abstract class DeclSpace : MemberCore {
 640                 /// <summary>
 641                 ///   This points to the actual definition that is being
 642                 ///   created with System.Reflection.Emit
 643                 /// </summary>
 644                 public TypeBuilder TypeBuilder;
 645
 646                 /// <summary>
 647                 ///   If we are a generic type, this is the type we are
 648                 ///   currently defining.  We need to lookup members on this
 649                 ///   instead of the TypeBuilder.
 650                 /// </summary>
 651                 public Type CurrentType;
 652
 653                 //
 654                 // This is the namespace in which this typecontainer
 655                 // was declared.  We use this to resolve names.
 656                 //
 657                 public NamespaceEntry NamespaceEntry;
 658
 659                 private Hashtable Cache = new Hashtable ();
 660
 661                 public readonly string Basename;
 662
 663                 protected Hashtable defined_names;
 664
 665                 readonly bool is_generic;
 666                 readonly int count_type_params;
 667                 readonly int count_current_type_params;
 668
 669                 // The emit context for toplevel objects.
 670                 protected EmitContext ec;
 671
 672                 public override EmitContext EmitContext {
 673                         get { return ec; }
 674                 }
 675
 676                 //
 677                 // Whether we are Generic
 678                 //
 679                 public bool IsGeneric {
 680                         get {
 681                                 if (is_generic)
 682                                         return true;
 683                                 else if (Parent != null)
 684                                         return Parent.IsGeneric;
 685                                 else
 686                                         return false;
 687                         }
 688                 }
 689
 690                 static string[] attribute_targets = new string [] { "type" };
 691
 692                 public DeclSpace (NamespaceEntry ns, DeclSpace parent, MemberName name,
 693                                   Attributes attrs)
 694                         : base (parent, name, attrs)
 695                 {
 696                         NamespaceEntry = ns;
 697                         Basename = name.Basename;
 698                         defined_names = new Hashtable ();
 699                         if (name.TypeArguments != null) {
 700                                 is_generic = true;
 701                                 count_type_params = count_current_type_params = name.TypeArguments.Count;
 702                         }
 703                         if (parent != null)
 704                                 count_type_params += parent.count_type_params;
 705                 }
 706
 707                 /// <summary>
 708                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 709                 /// </summary>
 710                 protected bool AddToContainer (MemberCore symbol, string name)
 711                 {
 712                         if (name == MemberName.Name && !(this is Interface) && !(this is Enum)) {
 713                                 if (symbol is TypeParameter)
 714                                         Report.Error (694, symbol.Location,
 715                                                       "Type parameter `{0}' has same name as " +
 716                                                       "containing type, or method", name);
 717                                 else {
 718                                         Report.SymbolRelatedToPreviousError (this);
 719                                         Report.Error (542,  symbol.Location,
 720                                                       "`{0}': member names cannot be the same " +
 721                                                       "as their enclosing type",
 722                                                       symbol.GetSignatureForError ());
 723                                         return false;
 724                                 }
 725                         }
 726
 727                         MemberCore mc = (MemberCore) defined_names [name];
 728
 729                         if (mc == null) {
 730                                 defined_names.Add (name, symbol);
 731                                 return true;
 732                         }
 733
 734                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 735                                 return true;
 736
 737                         Report.SymbolRelatedToPreviousError (mc);
 738                         if (symbol is PartialContainer || mc is PartialContainer) {
 739                                 Report.Error (260, symbol.Location,
 740                                         "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
 741                                         name);
 742                                 return false;
 743                         }
 744
 745                         if (this is RootTypes) {
 746                                 Report.Error (101, symbol.Location,
 747                                         "The namespace `{0}' already contains a definition for `{1}'",
 748                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
 749                         } else if (symbol is TypeParameter) {
 750                                 Report.Error (692, symbol.Location,
 751                                               "Duplicate type parameter `{0}'", name);
 752                         } else {
 753                                 Report.Error (102, symbol.Location,
 754                                               "The type `{0}' already contains a definition for `{1}'",
 755                                               GetSignatureForError (), symbol.MemberName.Name);
 756                         }
 757
 758                         return false;
 759                 }
 760
 761                 /// <summary>
 762                 ///   Returns the MemberCore associated with a given name in the declaration
 763                 ///   space. It doesn't return method based symbols !!
 764                 /// </summary>
 765                 ///
 766                 public MemberCore GetDefinition (string name)
 767                 {
 768                         return (MemberCore)defined_names [name];
 769                 }
 770
 771                 //
 772                 // root_types contains all the types.  All TopLevel types
 773                 // hence have a parent that points to `root_types', that is
 774                 // why there is a non-obvious test down here.
 775                 //
 776                 public bool IsTopLevel {
 777                         get { return (Parent != null && Parent.Parent == null); }
 778                 }
 779
 780                 public virtual void CloseType ()
 781                 {
 782                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 783                                 try {
 784                                         TypeBuilder.CreateType ();
 785                                 } catch {
 786                                         //
 787                                         // The try/catch is needed because
 788                                         // nested enumerations fail to load when they
 789                                         // are defined.
 790                                         //
 791                                         // Even if this is the right order (enumerations
 792                                         // declared after types).
 793                                         //
 794                                         // Note that this still creates the type and
 795                                         // it is possible to save it
 796                                 }
 797                                 caching_flags |= Flags.CloseTypeCreated;
 798                         }
 799                 }
 800
 801                 protected virtual TypeAttributes TypeAttr {
 802                         get { return CodeGen.Module.DefaultCharSetType; }
 803                 }
 804
 805                 /// <remarks>
 806                 ///  Should be overriten by the appropriate declaration space
 807                 /// </remarks>
 808                 public abstract TypeBuilder DefineType ();
 809
 810                 /// <summary>
 811                 ///   Define all members, but don't apply any attributes or do anything which may
 812                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 813                 /// </summary>
 814                 public virtual bool DefineMembers ()
 815                 {
 816                         if (((ModFlags & Modifiers.NEW) != 0) && IsTopLevel) {
 817                                 Report.Error (1530, Location, "Keyword `new' is not allowed on namespace elements");
 818                                 return false;
 819                         }
 820                         return true;
 821                 }
 822
 823                 public override string GetSignatureForError ()
 824                 {
 825                         if (IsGeneric) {
 826                                 return SimpleName.RemoveGenericArity (Name) + TypeParameter.GetSignatureForError (CurrentTypeParameters);
 827                         }
 828                         // Parent.GetSignatureForError
 829                         return Name;
 830                 }
 831
 832                 //
 833                 // Whether this is an `unsafe context'
 834                 //
 835                 public bool UnsafeContext {
 836                         get {
 837                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 838                                         return true;
 839                                 if (Parent != null)
 840                                         return Parent.UnsafeContext;
 841                                 return false;
 842                         }
 843                 }
 844
 845                 EmitContext type_resolve_ec;
 846                 protected EmitContext TypeResolveEmitContext {
 847                         get {
 848                                 if (type_resolve_ec == null) {
 849                                         // FIXME: I think this should really be one of:
 850                                         //
 851                                         // a. type_resolve_ec = Parent.EmitContext;
 852                                         // b. type_resolve_ec = new EmitContext (Parent, Parent, loc, null, null, ModFlags, false);
 853                                         //
 854                                         // However, if Parent == RootContext.Tree.Types, its NamespaceEntry will be null.
 855                                         //
 856                                         type_resolve_ec = new EmitContext (Parent, this, Location.Null, null, null, ModFlags, false);
 857                                 }
 858                                 return type_resolve_ec;
 859                         }
 860                 }
 861
 862                 // <summary>
 863                 //    Resolves the expression `e' for a type, and will recursively define
 864                 //    types.  This should only be used for resolving base types.
 865                 // </summary>
 866                 protected TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
 867                 {
 868                         TypeResolveEmitContext.loc = loc;
 869                         TypeResolveEmitContext.ResolvingTypeTree = true;
 870                         if (this is GenericMethod)
 871                                 TypeResolveEmitContext.ContainerType = Parent.TypeBuilder;
 872                         return e.ResolveAsTypeTerminal (TypeResolveEmitContext);
 873                 }
 874
 875                 public bool CheckAccessLevel (Type check_type)
 876                 {
 877                         TypeBuilder tb;
 878                         if ((this is GenericMethod) || (this is Iterator))
 879                                 tb = Parent.TypeBuilder;
 880                         else
 881                                 tb = TypeBuilder;
 882
 883                         check_type = TypeManager.DropGenericTypeArguments (check_type);
 884                         if (check_type == tb)
 885                                 return true;
 886
 887                         if (TypeBuilder == null)
 888                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 889                                 //        However, this is invoked again later -- so safe to return true.
 890                                 //        May also be null when resolving top-level attributes.
 891                                 return true;
 892
 893                         if (check_type.IsGenericParameter)
 894                                 return true; // FIXME
 895
 896                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 897
 898                         //
 899                         // Broken Microsoft runtime, return public for arrays, no matter what
 900                         // the accessibility is for their underlying class, and they return
 901                         // NonPublic visibility for pointers
 902                         //
 903                         if (check_type.IsArray || check_type.IsPointer)
 904                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 905
 906                         switch (check_attr){
 907                         case TypeAttributes.Public:
 908                                 return true;
 909
 910                         case TypeAttributes.NotPublic:
 911
 912                                 if (TypeBuilder == null)
 913                                         // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 914                                         //        However, this is invoked again later -- so safe to return true.
 915                                         //        May also be null when resolving top-level attributes.
 916                                         return true;
 917                                 //
 918                                 // This test should probably use the declaringtype.
 919                                 //
 920                                 return check_type.Assembly == TypeBuilder.Assembly ||
 921                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 922
 923                         case TypeAttributes.NestedPublic:
 924                                 return true;
 925
 926                         case TypeAttributes.NestedPrivate:
 927                                 return NestedAccessible (tb, check_type);
 928
 929                         case TypeAttributes.NestedFamily:
 930                                 //
 931                                 // Only accessible to methods in current type or any subtypes
 932                                 //
 933                                 return FamilyAccessible (tb, check_type);
 934
 935                         case TypeAttributes.NestedFamANDAssem:
 936                                 return ((check_type.Assembly == tb.Assembly) ||
 937                                                 TypeManager.IsFriendAssembly (check_type.Assembly)) &&
 938                                         FamilyAccessible (tb, check_type);
 939
 940                         case TypeAttributes.NestedFamORAssem:
 941                                 return (check_type.Assembly == tb.Assembly) ||
 942                                         FamilyAccessible (tb, check_type) ||
 943                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 944
 945                         case TypeAttributes.NestedAssembly:
 946                                 return check_type.Assembly == tb.Assembly ||
 947                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 948                         }
 949
 950                         Console.WriteLine ("HERE: " + check_attr);
 951                         return false;
 952
 953                 }
 954
 955                 protected bool NestedAccessible (Type tb, Type check_type)
 956                 {
 957                         Type declaring = check_type.DeclaringType;
 958                         return TypeBuilder == declaring ||
 959                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 960                 }
 961
 962                 protected bool FamilyAccessible (Type tb, Type check_type)
 963                 {
 964                         Type declaring = check_type.DeclaringType;
 965                         return TypeManager.IsNestedFamilyAccessible (TypeBuilder, declaring);
 966                 }
 967
 968                 // Access level of a type.
 969                 const int X = 1;
 970                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 971                         // Public    Assembly   Protected
 972                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 973                         Public              = (X << 0) | (X << 1) | (X << 2),
 974                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 975                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 976                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 977                 }
 978
 979                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 980                 {
 981                         if ((flags & Modifiers.INTERNAL) != 0) {
 982
 983                                 if ((flags & Modifiers.PROTECTED) != 0)
 984                                         return AccessLevel.ProtectedOrInternal;
 985                                 else
 986                                         return AccessLevel.Internal;
 987
 988                         } else if ((flags & Modifiers.PROTECTED) != 0)
 989                                 return AccessLevel.Protected;
 990                         else if ((flags & Modifiers.PRIVATE) != 0)
 991                                 return AccessLevel.Private;
 992                         else
 993                                 return AccessLevel.Public;
 994                 }
 995
 996                 // What is the effective access level of this?
 997                 // TODO: Cache this?
 998                 AccessLevel EffectiveAccessLevel {
 999                         get {
1000                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
1001                                 if (!IsTopLevel && (Parent != null))
1002                                         return myAccess & Parent.EffectiveAccessLevel;
1003                                 return myAccess;
1004                         }
1005                 }
1006
1007                 // Return the access level for type `t'
1008                 static AccessLevel TypeEffectiveAccessLevel (Type t)
1009                 {
1010                         if (t.IsPublic)
1011                                 return AccessLevel.Public;
1012                         if (t.IsNestedPrivate)
1013                                 return AccessLevel.Private;
1014                         if (t.IsNotPublic)
1015                                 return AccessLevel.Internal;
1016
1017                         // By now, it must be nested
1018                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
1019
1020                         if (t.IsNestedPublic)
1021                                 return parentLevel;
1022                         if (t.IsNestedAssembly)
1023                                 return parentLevel & AccessLevel.Internal;
1024                         if (t.IsNestedFamily)
1025                                 return parentLevel & AccessLevel.Protected;
1026                         if (t.IsNestedFamORAssem)
1027                                 return parentLevel & AccessLevel.ProtectedOrInternal;
1028                         if (t.IsNestedFamANDAssem)
1029                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
1030
1031                         // nested private is taken care of
1032
1033                         throw new Exception ("I give up, what are you?");
1034                 }
1035
1036                 //
1037                 // This answers `is the type P, as accessible as a member M which has the
1038                 // accessability @flags which is declared as a nested member of the type T, this declspace'
1039                 //
1040                 public bool AsAccessible (Type p, int flags)
1041                 {
1042                         if (p.IsGenericParameter)
1043                                 return true; // FIXME
1044
1045                         //
1046                         // 1) if M is private, its accessability is the same as this declspace.
1047                         // we already know that P is accessible to T before this method, so we
1048                         // may return true.
1049                         //
1050
1051                         if ((flags & Modifiers.PRIVATE) != 0)
1052                                 return true;
1053
1054                         while (p.IsArray || p.IsPointer || p.IsByRef)
1055                                 p = TypeManager.GetElementType (p);
1056
1057                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
1058                         AccessLevel mAccess = this.EffectiveAccessLevel &
1059                                 GetAccessLevelFromModifiers (flags);
1060
1061                         // for every place from which we can access M, we must
1062                         // be able to access P as well. So, we want
1063                         // For every bit in M and P, M_i -> P_1 == true
1064                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
1065
1066                         return ~ (~ mAccess | pAccess) == 0;
1067                 }
1068
1069                 //
1070                 // Return the nested type with name @name.  Ensures that the nested type
1071                 // is defined if necessary.  Do _not_ use this when you have a MemberCache handy.
1072                 //
1073                 public virtual Type FindNestedType (string name)
1074                 {
1075                         return null;
1076                 }
1077
1078                 private Type LookupNestedTypeInHierarchy (string name)
1079                 {
1080                         // if the member cache has been created, lets use it.
1081                         // the member cache is MUCH faster.
1082                         if (MemberCache != null)
1083                                 return MemberCache.FindNestedType (name);
1084
1085                         // no member cache. Do it the hard way -- reflection
1086                         Type t = null;
1087                         for (Type current_type = TypeBuilder;
1088                              current_type != null && current_type != TypeManager.object_type;
1089                              current_type = current_type.BaseType) {
1090                                 current_type = TypeManager.DropGenericTypeArguments (current_type);
1091                                 if (current_type is TypeBuilder) {
1092                                         DeclSpace decl = this;
1093                                         if (current_type != TypeBuilder)
1094                                                 decl = TypeManager.LookupDeclSpace (current_type);
1095                                         t = decl.FindNestedType (name);
1096                                 } else {
1097                                         t = TypeManager.GetNestedType (current_type, name);
1098                                 }
1099
1100                                 if (t != null && CheckAccessLevel (t))
1101                                         return t;
1102                         }
1103
1104                         return null;
1105                 }
1106
1107                 //
1108                 // Public function used to locate types.
1109                 //
1110                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1111                 //
1112                 // Returns: Type or null if they type can not be found.
1113                 //
1114                 public FullNamedExpression LookupType (string name, Location loc, bool ignore_cs0104)
1115                 {
1116                         if (this is PartialContainer)
1117                                 throw new InternalErrorException ("Should not get here");
1118
1119                         if (Cache.Contains (name))
1120                                 return (FullNamedExpression) Cache [name];
1121
1122                         FullNamedExpression e;
1123                         Type t = LookupNestedTypeInHierarchy (name);
1124                         if (t != null)
1125                                 e = new TypeExpression (t, Location.Null);
1126                         else if (Parent != null && Parent != RootContext.Tree.Types)
1127                                 e = Parent.LookupType (name, loc, ignore_cs0104);
1128                         else
1129                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
1130
1131                         Cache [name] = e;
1132                         return e;
1133                 }
1134
1135                 /// <remarks>
1136                 ///   This function is broken and not what you're looking for.  It should only
1137                 ///   be used while the type is still being created since it doesn't use the cache
1138                 ///   and relies on the filter doing the member name check.
1139                 /// </remarks>
1140                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1141                                                         MemberFilter filter, object criteria);
1142
1143                 /// <remarks>
1144                 ///   If we have a MemberCache, return it.  This property may return null if the
1145                 ///   class doesn't have a member cache or while it's still being created.
1146                 /// </remarks>
1147                 public abstract MemberCache MemberCache {
1148                         get;
1149                 }
1150
1151                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1152                 {
1153                         if (a.Type == TypeManager.required_attr_type) {
1154                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1155                                 return;
1156                         }
1157                         TypeBuilder.SetCustomAttribute (cb);
1158                 }
1159
1160                 /// <summary>
1161                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
1162                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
1163                 /// </summary>
1164                 public bool GetClsCompliantAttributeValue ()
1165                 {
1166                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
1167                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
1168
1169                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
1170
1171                         if (OptAttributes != null) {
1172                                 Attribute cls_attribute = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, ec);
1173                                 if (cls_attribute != null) {
1174                                         caching_flags |= Flags.HasClsCompliantAttribute;
1175                                         if (cls_attribute.GetClsCompliantAttributeValue (ec)) {
1176                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1177                                                 return true;
1178                                         }
1179                                         return false;
1180                                 }
1181                         }
1182
1183                         if (Parent == null) {
1184                                 if (CodeGen.Assembly.IsClsCompliant) {
1185                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
1186                                         return true;
1187                                 }
1188                                 return false;
1189                         }
1190
1191                         if (Parent.GetClsCompliantAttributeValue ()) {
1192                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1193                                 return true;
1194                         }
1195                         return false;
1196                 }
1197
1198                 //
1199                 // Extensions for generics
1200                 //
1201                 TypeParameter[] type_params;
1202                 TypeParameter[] type_param_list;
1203
1204                 protected string GetInstantiationName ()
1205                 {
1206                         StringBuilder sb = new StringBuilder (Name);
1207                         sb.Append ("<");
1208                         for (int i = 0; i < type_param_list.Length; i++) {
1209                                 if (i > 0)
1210                                         sb.Append (",");
1211                                 sb.Append (type_param_list [i].Name);
1212                         }
1213                         sb.Append (">");
1214                         return sb.ToString ();
1215                 }
1216
1217                 bool check_type_parameter (ArrayList list, int start, string name)
1218                 {
1219                         for (int i = 0; i < start; i++) {
1220                                 TypeParameter param = (TypeParameter) list [i];
1221
1222                                 if (param.Name != name)
1223                                         continue;
1224
1225                                 Report.Warning (693, 3, Location,
1226                                         "Type parameter `{0}' has same name as type parameter from outer type `{1}'",
1227                                         name, Parent.GetInstantiationName ());
1228
1229                                 return false;
1230                         }
1231
1232                         return true;
1233                 }
1234
1235                 TypeParameter[] initialize_type_params ()
1236                 {
1237                         if (type_param_list != null)
1238                                 return type_param_list;
1239
1240                         DeclSpace the_parent = Parent;
1241                         if (this is GenericMethod)
1242                                 the_parent = null;
1243
1244                         int start = 0;
1245                         TypeParameter[] parent_params = null;
1246                         if ((the_parent != null) && the_parent.IsGeneric) {
1247                                 parent_params = the_parent.initialize_type_params ();
1248                                 start = parent_params != null ? parent_params.Length : 0;
1249                         }
1250
1251                         ArrayList list = new ArrayList ();
1252                         if (parent_params != null)
1253                                 list.AddRange (parent_params);
1254
1255                         int count = type_params != null ? type_params.Length : 0;
1256                         for (int i = 0; i < count; i++) {
1257                                 TypeParameter param = type_params [i];
1258                                 check_type_parameter (list, start, param.Name);
1259                                 list.Add (param);
1260                         }
1261
1262                         type_param_list = new TypeParameter [list.Count];
1263                         list.CopyTo (type_param_list, 0);
1264                         return type_param_list;
1265                 }
1266
1267                 public virtual void SetParameterInfo (ArrayList constraints_list)
1268                 {
1269                         if (!is_generic) {
1270                                 if (constraints_list != null) {
1271                                         Report.Error (
1272                                                 80, Location, "Constraints are not allowed " +
1273                                                 "on non-generic declarations");
1274                                 }
1275
1276                                 return;
1277                         }
1278
1279                         TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1280                         type_params = new TypeParameter [names.Length];
1281
1282                         //
1283                         // Register all the names
1284                         //
1285                         for (int i = 0; i < type_params.Length; i++) {
1286                                 TypeParameterName name = names [i];
1287
1288                                 Constraints constraints = null;
1289                                 if (constraints_list != null) {
1290                                         foreach (Constraints constraint in constraints_list) {
1291                                                 if (constraint == null)
1292                                                         continue;
1293                                                 if (constraint.TypeParameter == name.Name) {
1294                                                         constraints = constraint;
1295                                                         break;
1296                                                 }
1297                                         }
1298                                 }
1299
1300                                 type_params [i] = new TypeParameter (
1301                                         Parent, this, name.Name, constraints, name.OptAttributes,
1302                                         Location);
1303
1304                                 AddToContainer (type_params [i], name.Name);
1305                         }
1306                 }
1307
1308                 public TypeParameter[] TypeParameters {
1309                         get {
1310                                 if (!IsGeneric)
1311                                         throw new InvalidOperationException ();
1312                                 if (type_param_list == null)
1313                                         initialize_type_params ();
1314
1315                                 return type_param_list;
1316                         }
1317                 }
1318
1319                 public TypeParameter[] CurrentTypeParameters {
1320                         get {
1321                                 if (!IsGeneric)
1322                                         throw new InvalidOperationException ();
1323                                 if (type_params != null)
1324                                         return type_params;
1325                                 else
1326                                         return new TypeParameter [0];
1327                         }
1328                 }
1329
1330                 public int CountTypeParameters {
1331                         get {
1332                                 return count_type_params;
1333                         }
1334                 }
1335
1336                 public int CountCurrentTypeParameters {
1337                         get {
1338                                 return count_current_type_params;
1339                         }
1340                 }
1341
1342                 public TypeParameterExpr LookupGeneric (string name, Location loc)
1343                 {
1344                         if (!IsGeneric)
1345                                 return null;
1346
1347                         foreach (TypeParameter type_param in CurrentTypeParameters) {
1348                                 if (type_param.Name != name)
1349                                         continue;
1350
1351                                 return new TypeParameterExpr (type_param, loc);
1352                         }
1353
1354                         if (Parent != null)
1355                                 return Parent.LookupGeneric (name, loc);
1356
1357                         return null;
1358                 }
1359
1360                 public override string[] ValidAttributeTargets {
1361                         get { return attribute_targets; }
1362                 }
1363
1364                 protected override bool VerifyClsCompliance (DeclSpace ds)
1365                 {
1366                         if (!base.VerifyClsCompliance (ds)) {
1367                                 return false;
1368                         }
1369
1370                         IDictionary cache = TypeManager.AllClsTopLevelTypes;
1371                         string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1372                         if (!cache.Contains (lcase)) {
1373                                 cache.Add (lcase, this);
1374                                 return true;
1375                         }
1376
1377                         object val = cache [lcase];
1378                         if (val == null) {
1379                                 Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
1380                                 if (t == null)
1381                                         return true;
1382                                 Report.SymbolRelatedToPreviousError (t);
1383                         }
1384                         else {
1385                                 if (val is PartialContainer)
1386                                         return true;
1387
1388                                 Report.SymbolRelatedToPreviousError ((DeclSpace)val);
1389                         }
1390                         Report.Warning (3005, 1, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1391                         return true;
1392                 }
1393         }
1394
1395         /// <summary>
1396         ///   This is a readonly list of MemberInfo's.
1397         /// </summary>
1398         public class MemberList : IList {
1399                 public readonly IList List;
1400                 int count;
1401
1402                 /// <summary>
1403                 ///   Create a new MemberList from the given IList.
1404                 /// </summary>
1405                 public MemberList (IList list)
1406                 {
1407                         if (list != null)
1408                                 this.List = list;
1409                         else
1410                                 this.List = new ArrayList ();
1411                         count = List.Count;
1412                 }
1413
1414                 /// <summary>
1415                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1416                 /// </summary>
1417                 public MemberList (IList first, IList second)
1418                 {
1419                         ArrayList list = new ArrayList ();
1420                         list.AddRange (first);
1421                         list.AddRange (second);
1422                         count = list.Count;
1423                         List = list;
1424                 }
1425
1426                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1427
1428                 /// <summary>
1429                 ///   Cast the MemberList into a MemberInfo[] array.
1430                 /// </summary>
1431                 /// <remarks>
1432                 ///   This is an expensive operation, only use it if it's really necessary.
1433                 /// </remarks>
1434                 public static explicit operator MemberInfo [] (MemberList list)
1435                 {
1436                         Timer.StartTimer (TimerType.MiscTimer);
1437                         MemberInfo [] result = new MemberInfo [list.Count];
1438                         list.CopyTo (result, 0);
1439                         Timer.StopTimer (TimerType.MiscTimer);
1440                         return result;
1441                 }
1442
1443                 // ICollection
1444
1445                 public int Count {
1446                         get {
1447                                 return count;
1448                         }
1449                 }
1450
1451                 public bool IsSynchronized {
1452                         get {
1453                                 return List.IsSynchronized;
1454                         }
1455                 }
1456
1457                 public object SyncRoot {
1458                         get {
1459                                 return List.SyncRoot;
1460                         }
1461                 }
1462
1463                 public void CopyTo (Array array, int index)
1464                 {
1465                         List.CopyTo (array, index);
1466                 }
1467
1468                 // IEnumerable
1469
1470                 public IEnumerator GetEnumerator ()
1471                 {
1472                         return List.GetEnumerator ();
1473                 }
1474
1475                 // IList
1476
1477                 public bool IsFixedSize {
1478                         get {
1479                                 return true;
1480                         }
1481                 }
1482
1483                 public bool IsReadOnly {
1484                         get {
1485                                 return true;
1486                         }
1487                 }
1488
1489                 object IList.this [int index] {
1490                         get {
1491                                 return List [index];
1492                         }
1493
1494                         set {
1495                                 throw new NotSupportedException ();
1496                         }
1497                 }
1498
1499                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1500                 public MemberInfo this [int index] {
1501                         get {
1502                                 return (MemberInfo) List [index];
1503                         }
1504                 }
1505
1506                 public int Add (object value)
1507                 {
1508                         throw new NotSupportedException ();
1509                 }
1510
1511                 public void Clear ()
1512                 {
1513                         throw new NotSupportedException ();
1514                 }
1515
1516                 public bool Contains (object value)
1517                 {
1518                         return List.Contains (value);
1519                 }
1520
1521                 public int IndexOf (object value)
1522                 {
1523                         return List.IndexOf (value);
1524                 }
1525
1526                 public void Insert (int index, object value)
1527                 {
1528                         throw new NotSupportedException ();
1529                 }
1530
1531                 public void Remove (object value)
1532                 {
1533                         throw new NotSupportedException ();
1534                 }
1535
1536                 public void RemoveAt (int index)
1537                 {
1538                         throw new NotSupportedException ();
1539                 }
1540         }
1541
1542         /// <summary>
1543         ///   This interface is used to get all members of a class when creating the
1544         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1545         ///   want to support the member cache and by TypeHandle to get caching of
1546         ///   non-dynamic types.
1547         /// </summary>
1548         public interface IMemberContainer {
1549                 /// <summary>
1550                 ///   The name of the IMemberContainer.  This is only used for
1551                 ///   debugging purposes.
1552                 /// </summary>
1553                 string Name {
1554                         get;
1555                 }
1556
1557                 /// <summary>
1558                 ///   The type of this IMemberContainer.
1559                 /// </summary>
1560                 Type Type {
1561                         get;
1562                 }
1563
1564                 /// <summary>
1565                 ///   Returns the IMemberContainer of the base class or null if this
1566                 ///   is an interface or TypeManger.object_type.
1567                 ///   This is used when creating the member cache for a class to get all
1568                 ///   members from the base class.
1569                 /// </summary>
1570                 MemberCache BaseCache {
1571                         get;
1572                 }
1573
1574                 /// <summary>
1575                 ///   Whether this is an interface.
1576                 /// </summary>
1577                 bool IsInterface {
1578                         get;
1579                 }
1580
1581                 /// <summary>
1582                 ///   Returns all members of this class with the corresponding MemberTypes
1583                 ///   and BindingFlags.
1584                 /// </summary>
1585                 /// <remarks>
1586                 ///   When implementing this method, make sure not to return any inherited
1587                 ///   members and check the MemberTypes and BindingFlags properly.
1588                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1589                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1590                 ///   MemberInfo class, but the cache needs this information.  That's why
1591                 ///   this method is called multiple times with different BindingFlags.
1592                 /// </remarks>
1593                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1594
1595                 /// <summary>
1596                 ///   Return the container's member cache.
1597                 /// </summary>
1598                 MemberCache MemberCache {
1599                         get;
1600                 }
1601         }
1602
1603         /// <summary>
1604         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1605         ///   member lookups.  It has a member name based hash table; it maps each member
1606         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1607         ///   and the BindingFlags that were initially used to get it.  The cache contains
1608         ///   all members of the current class and all inherited members.  If this cache is
1609         ///   for an interface types, it also contains all inherited members.
1610         ///
1611         ///   There are two ways to get a MemberCache:
1612         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1613         ///     use the DeclSpace.MemberCache property.
1614         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1615         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1616         /// </summary>
1617         public class MemberCache {
1618                 public readonly IMemberContainer Container;
1619                 protected Hashtable member_hash;
1620                 protected Hashtable method_hash;
1621
1622                 /// <summary>
1623                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1624                 /// </summary>
1625                 public MemberCache (IMemberContainer container)
1626                 {
1627                         this.Container = container;
1628
1629                         Timer.IncrementCounter (CounterType.MemberCache);
1630                         Timer.StartTimer (TimerType.CacheInit);
1631
1632                         // If we have a base class (we have a base class unless we're
1633                         // TypeManager.object_type), we deep-copy its MemberCache here.
1634                         if (Container.BaseCache != null)
1635                                 member_hash = SetupCache (Container.BaseCache);
1636                         else
1637                                 member_hash = new Hashtable ();
1638
1639                         // If this is neither a dynamic type nor an interface, create a special
1640                         // method cache with all declared and inherited methods.
1641                         Type type = container.Type;
1642                         if (!(type is TypeBuilder) && !type.IsInterface &&
1643                             // !(type.IsGenericType && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
1644                             !type.IsGenericType &&
1645                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1646                                 method_hash = new Hashtable ();
1647                                 AddMethods (type);
1648                         }
1649
1650                         // Add all members from the current class.
1651                         AddMembers (Container);
1652
1653                         Timer.StopTimer (TimerType.CacheInit);
1654                 }
1655
1656                 public MemberCache (Type[] ifaces)
1657                 {
1658                         //
1659                         // The members of this cache all belong to other caches.
1660                         // So, 'Container' will not be used.
1661                         //
1662                         this.Container = null;
1663
1664                         member_hash = new Hashtable ();
1665                         if (ifaces == null)
1666                                 return;
1667
1668                         foreach (Type itype in ifaces)
1669                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1670                 }
1671
1672                 /// <summary>
1673                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1674                 /// </summary>
1675                 Hashtable SetupCache (MemberCache base_class)
1676                 {
1677                         Hashtable hash = new Hashtable ();
1678
1679                         if (base_class == null)
1680                                 return hash;
1681
1682                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1683                         while (it.MoveNext ()) {
1684                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1685                          }
1686
1687                         return hash;
1688                 }
1689
1690                 /// <summary>
1691                 ///   Add the contents of `cache' to the member_hash.
1692                 /// </summary>
1693                 void AddCacheContents (MemberCache cache)
1694                 {
1695                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1696                         while (it.MoveNext ()) {
1697                                 ArrayList list = (ArrayList) member_hash [it.Key];
1698                                 if (list == null)
1699                                         member_hash [it.Key] = list = new ArrayList ();
1700
1701                                 ArrayList entries = (ArrayList) it.Value;
1702                                 for (int i = entries.Count-1; i >= 0; i--) {
1703                                         CacheEntry entry = (CacheEntry) entries [i];
1704
1705                                         if (entry.Container != cache.Container)
1706                                                 break;
1707                                         list.Add (entry);
1708                                 }
1709                         }
1710                 }
1711
1712                 /// <summary>
1713                 ///   Add all members from class `container' to the cache.
1714                 /// </summary>
1715                 void AddMembers (IMemberContainer container)
1716                 {
1717                         // We need to call AddMembers() with a single member type at a time
1718                         // to get the member type part of CacheEntry.EntryType right.
1719                         if (!container.IsInterface) {
1720                         AddMembers (MemberTypes.Constructor, container);
1721                         AddMembers (MemberTypes.Field, container);
1722                         }
1723                         AddMembers (MemberTypes.Method, container);
1724                         AddMembers (MemberTypes.Property, container);
1725                         AddMembers (MemberTypes.Event, container);
1726                         // Nested types are returned by both Static and Instance searches.
1727                         AddMembers (MemberTypes.NestedType,
1728                                     BindingFlags.Static | BindingFlags.Public, container);
1729                         AddMembers (MemberTypes.NestedType,
1730                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1731                 }
1732
1733                 void AddMembers (MemberTypes mt, IMemberContainer container)
1734                 {
1735                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1736                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1737                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1738                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1739                 }
1740
1741                 /// <summary>
1742                 ///   Add all members from class `container' with the requested MemberTypes and
1743                 ///   BindingFlags to the cache.  This method is called multiple times with different
1744                 ///   MemberTypes and BindingFlags.
1745                 /// </summary>
1746                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1747                 {
1748                         MemberList members = container.GetMembers (mt, bf);
1749
1750                         foreach (MemberInfo member in members) {
1751                                 string name = member.Name;
1752
1753                                 int pos = name.IndexOf ('<');
1754                                 if (pos > 0)
1755                                         name = name.Substring (0, pos);
1756
1757                                 // We use a name-based hash table of ArrayList's.
1758                                 ArrayList list = (ArrayList) member_hash [name];
1759                                 if (list == null) {
1760                                         list = new ArrayList ();
1761                                         member_hash.Add (name, list);
1762                                 }
1763
1764                                 // When this method is called for the current class, the list will
1765                                 // already contain all inherited members from our base classes.
1766                                 // We cannot add new members in front of the list since this'd be an
1767                                 // expensive operation, that's why the list is sorted in reverse order
1768                                 // (ie. members from the current class are coming last).
1769                                 list.Add (new CacheEntry (container, member, mt, bf));
1770                         }
1771                 }
1772
1773                 /// <summary>
1774                 ///   Add all declared and inherited methods from class `type' to the method cache.
1775                 /// </summary>
1776                 void AddMethods (Type type)
1777                 {
1778                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1779                                     BindingFlags.FlattenHierarchy, type);
1780                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1781                                     BindingFlags.FlattenHierarchy, type);
1782                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1783                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1784                 }
1785
1786                 static ArrayList overrides = new ArrayList ();
1787
1788                 void AddMethods (BindingFlags bf, Type type)
1789                 {
1790                         MethodBase [] members = type.GetMethods (bf);
1791
1792                         Array.Reverse (members);
1793
1794                         foreach (MethodBase member in members) {
1795                                 string name = member.Name;
1796
1797                                 // We use a name-based hash table of ArrayList's.
1798                                 ArrayList list = (ArrayList) method_hash [name];
1799                                 if (list == null) {
1800                                         list = new ArrayList ();
1801                                         method_hash.Add (name, list);
1802                                 }
1803
1804                                 MethodInfo curr = (MethodInfo) member;
1805                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1806                                         MethodInfo base_method = curr.GetBaseDefinition ();
1807
1808                                         if (base_method == curr)
1809                                                 // Not every virtual function needs to have a NewSlot flag.
1810                                                 break;
1811
1812                                         overrides.Add (curr);
1813                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1814                                         curr = base_method;
1815                                 }
1816
1817                                 if (overrides.Count > 0) {
1818                                         for (int i = 0; i < overrides.Count; ++i)
1819                                                 TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
1820                                         overrides.Clear ();
1821                                 }
1822
1823                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1824                                 // sorted so we need to do this check for every member.
1825                                 BindingFlags new_bf = bf;
1826                                 if (member.DeclaringType == type)
1827                                         new_bf |= BindingFlags.DeclaredOnly;
1828
1829                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1830                         }
1831                 }
1832
1833                 /// <summary>
1834                 ///   Compute and return a appropriate `EntryType' magic number for the given
1835                 ///   MemberTypes and BindingFlags.
1836                 /// </summary>
1837                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1838                 {
1839                         EntryType type = EntryType.None;
1840
1841                         if ((mt & MemberTypes.Constructor) != 0)
1842                                 type |= EntryType.Constructor;
1843                         if ((mt & MemberTypes.Event) != 0)
1844                                 type |= EntryType.Event;
1845                         if ((mt & MemberTypes.Field) != 0)
1846                                 type |= EntryType.Field;
1847                         if ((mt & MemberTypes.Method) != 0)
1848                                 type |= EntryType.Method;
1849                         if ((mt & MemberTypes.Property) != 0)
1850                                 type |= EntryType.Property;
1851                         // Nested types are returned by static and instance searches.
1852                         if ((mt & MemberTypes.NestedType) != 0)
1853                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1854
1855                         if ((bf & BindingFlags.Instance) != 0)
1856                                 type |= EntryType.Instance;
1857                         if ((bf & BindingFlags.Static) != 0)
1858                                 type |= EntryType.Static;
1859                         if ((bf & BindingFlags.Public) != 0)
1860                                 type |= EntryType.Public;
1861                         if ((bf & BindingFlags.NonPublic) != 0)
1862                                 type |= EntryType.NonPublic;
1863                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1864                                 type |= EntryType.Declared;
1865
1866                         return type;
1867                 }
1868
1869                 /// <summary>
1870                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1871                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1872                 ///   single member types.
1873                 /// </summary>
1874                 public static bool IsSingleMemberType (MemberTypes mt)
1875                 {
1876                         switch (mt) {
1877                         case MemberTypes.Constructor:
1878                         case MemberTypes.Event:
1879                         case MemberTypes.Field:
1880                         case MemberTypes.Method:
1881                         case MemberTypes.Property:
1882                         case MemberTypes.NestedType:
1883                                 return true;
1884
1885                         default:
1886                                 return false;
1887                         }
1888                 }
1889
1890                 /// <summary>
1891                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1892                 ///   number to speed up the searching process.
1893                 /// </summary>
1894                 [Flags]
1895                 protected enum EntryType {
1896                         None            = 0x000,
1897
1898                         Instance        = 0x001,
1899                         Static          = 0x002,
1900                         MaskStatic      = Instance|Static,
1901
1902                         Public          = 0x004,
1903                         NonPublic       = 0x008,
1904                         MaskProtection  = Public|NonPublic,
1905
1906                         Declared        = 0x010,
1907
1908                         Constructor     = 0x020,
1909                         Event           = 0x040,
1910                         Field           = 0x080,
1911                         Method          = 0x100,
1912                         Property        = 0x200,
1913                         NestedType      = 0x400,
1914
1915                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1916                 }
1917
1918                 protected class CacheEntry {
1919                         public readonly IMemberContainer Container;
1920                         public EntryType EntryType;
1921                         public MemberInfo Member;
1922
1923                         public CacheEntry (IMemberContainer container, MemberInfo member,
1924                                            MemberTypes mt, BindingFlags bf)
1925                         {
1926                                 this.Container = container;
1927                                 this.Member = member;
1928                                 this.EntryType = GetEntryType (mt, bf);
1929                         }
1930
1931                         public override string ToString ()
1932                         {
1933                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1934                                                       EntryType, Member);
1935                         }
1936                 }
1937
1938                 /// <summary>
1939                 ///   This is called each time we're walking up one level in the class hierarchy
1940                 ///   and checks whether we can abort the search since we've already found what
1941                 ///   we were looking for.
1942                 /// </summary>
1943                 protected bool DoneSearching (ArrayList list)
1944                 {
1945                         //
1946                         // We've found exactly one member in the current class and it's not
1947                         // a method or constructor.
1948                         //
1949                         if (list.Count == 1 && !(list [0] is MethodBase))
1950                                 return true;
1951
1952                         //
1953                         // Multiple properties: we query those just to find out the indexer
1954                         // name
1955                         //
1956                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1957                                 return true;
1958
1959                         return false;
1960                 }
1961
1962                 /// <summary>
1963                 ///   Looks up members with name `name'.  If you provide an optional
1964                 ///   filter function, it'll only be called with members matching the
1965                 ///   requested member name.
1966                 ///
1967                 ///   This method will try to use the cache to do the lookup if possible.
1968                 ///
1969                 ///   Unlike other FindMembers implementations, this method will always
1970                 ///   check all inherited members - even when called on an interface type.
1971                 ///
1972                 ///   If you know that you're only looking for methods, you should use
1973                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1974                 ///   When doing a method-only search, it'll try to use a special method
1975                 ///   cache (unless it's a dynamic type or an interface) and the returned
1976                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1977                 ///   The lookup process will automatically restart itself in method-only
1978                 ///   search mode if it discovers that it's about to return methods.
1979                 /// </summary>
1980                 ArrayList global = new ArrayList ();
1981                 bool using_global = false;
1982
1983                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1984
1985                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1986                                                MemberFilter filter, object criteria)
1987                 {
1988                         if (using_global)
1989                                 throw new Exception ();
1990
1991                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1992                         bool method_search = mt == MemberTypes.Method;
1993                         // If we have a method cache and we aren't already doing a method-only search,
1994                         // then we restart a method search if the first match is a method.
1995                         bool do_method_search = !method_search && (method_hash != null);
1996
1997                         ArrayList applicable;
1998
1999                         // If this is a method-only search, we try to use the method cache if
2000                         // possible; a lookup in the method cache will return a MemberInfo with
2001                         // the correct ReflectedType for inherited methods.
2002
2003                         if (method_search && (method_hash != null))
2004                                 applicable = (ArrayList) method_hash [name];
2005                         else
2006                                 applicable = (ArrayList) member_hash [name];
2007
2008                         if (applicable == null)
2009                                 return emptyMemberInfo;
2010
2011                         //
2012                         // 32  slots gives 53 rss/54 size
2013                         // 2/4 slots gives 55 rss
2014                         //
2015                         // Strange: from 25,000 calls, only 1,800
2016                         // are above 2.  Why does this impact it?
2017                         //
2018                         global.Clear ();
2019                         using_global = true;
2020
2021                         Timer.StartTimer (TimerType.CachedLookup);
2022
2023                         EntryType type = GetEntryType (mt, bf);
2024
2025                         IMemberContainer current = Container;
2026
2027
2028                         // `applicable' is a list of all members with the given member name `name'
2029                         // in the current class and all its base classes.  The list is sorted in
2030                         // reverse order due to the way how the cache is initialy created (to speed
2031                         // things up, we're doing a deep-copy of our base).
2032
2033                         for (int i = applicable.Count-1; i >= 0; i--) {
2034                                 CacheEntry entry = (CacheEntry) applicable [i];
2035
2036                                 // This happens each time we're walking one level up in the class
2037                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
2038                                 // the first time this happens (this may already happen in the first
2039                                 // iteration of this loop if there are no members with the name we're
2040                                 // looking for in the current class).
2041                                 if (entry.Container != current) {
2042                                         if (declared_only || DoneSearching (global))
2043                                                 break;
2044
2045                                         current = entry.Container;
2046                                 }
2047
2048                                 // Is the member of the correct type ?
2049                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2050                                         continue;
2051
2052                                 // Is the member static/non-static ?
2053                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2054                                         continue;
2055
2056                                 // Apply the filter to it.
2057                                 if (filter (entry.Member, criteria)) {
2058                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
2059                                                 do_method_search = false;
2060                                         global.Add (entry.Member);
2061                                 }
2062                         }
2063
2064                         Timer.StopTimer (TimerType.CachedLookup);
2065
2066                         // If we have a method cache and we aren't already doing a method-only
2067                         // search, we restart in method-only search mode if the first match is
2068                         // a method.  This ensures that we return a MemberInfo with the correct
2069                         // ReflectedType for inherited methods.
2070                         if (do_method_search && (global.Count > 0)){
2071                                 using_global = false;
2072
2073                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2074                         }
2075
2076                         using_global = false;
2077                         MemberInfo [] copy = new MemberInfo [global.Count];
2078                         global.CopyTo (copy);
2079                         return copy;
2080                 }
2081
2082                 // find the nested type @name in @this.
2083                 public Type FindNestedType (string name)
2084                 {
2085                         ArrayList applicable = (ArrayList) member_hash [name];
2086                         if (applicable == null)
2087                                 return null;
2088
2089                         for (int i = applicable.Count-1; i >= 0; i--) {
2090                                 CacheEntry entry = (CacheEntry) applicable [i];
2091                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
2092                                         return (Type) entry.Member;
2093                         }
2094
2095                         return null;
2096                 }
2097
2098                 //
2099                 // This finds the method or property for us to override. invocationType is the type where
2100                 // the override is going to be declared, name is the name of the method/property, and
2101                 // paramTypes is the parameters, if any to the method or property
2102                 //
2103                 // Because the MemberCache holds members from this class and all the base classes,
2104                 // we can avoid tons of reflection stuff.
2105                 //
2106                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, GenericMethod genericMethod, bool is_property)
2107                 {
2108                         ArrayList applicable;
2109                         if (method_hash != null && !is_property)
2110                                 applicable = (ArrayList) method_hash [name];
2111                         else
2112                                 applicable = (ArrayList) member_hash [name];
2113
2114                         if (applicable == null)
2115                                 return null;
2116                         //
2117                         // Walk the chain of methods, starting from the top.
2118                         //
2119                         for (int i = applicable.Count - 1; i >= 0; i--) {
2120                                 CacheEntry entry = (CacheEntry) applicable [i];
2121
2122                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2123                                         continue;
2124
2125                                 PropertyInfo pi = null;
2126                                 MethodInfo mi = null;
2127                                 FieldInfo fi = null;
2128                                 Type [] cmpAttrs = null;
2129
2130                                 if (is_property) {
2131                                         if ((entry.EntryType & EntryType.Field) != 0) {
2132                                                 fi = (FieldInfo)entry.Member;
2133
2134                                                 // TODO: For this case we ignore member type
2135                                                 //fb = TypeManager.GetField (fi);
2136                                                 //cmpAttrs = new Type[] { fb.MemberType };
2137                                         } else {
2138                                                 pi = (PropertyInfo) entry.Member;
2139                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
2140                                         }
2141                                 } else {
2142                                         mi = (MethodInfo) entry.Member;
2143                                         cmpAttrs = TypeManager.GetParameterData (mi).Types;
2144                                 }
2145
2146                                 if (fi != null) {
2147                                         // TODO: Almost duplicate !
2148                                         // Check visibility
2149                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2150                                                 case FieldAttributes.Private:
2151                                                         //
2152                                                         // A private method is Ok if we are a nested subtype.
2153                                                         // The spec actually is not very clear about this, see bug 52458.
2154                                                         //
2155                                                         if (invocationType != entry.Container.Type &
2156                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2157                                                                 continue;
2158
2159                                                         break;
2160                                                 case FieldAttributes.FamANDAssem:
2161                                                 case FieldAttributes.Assembly:
2162                                                         //
2163                                                         // Check for assembly methods
2164                                                         //
2165                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2166                                                                 continue;
2167                                                         break;
2168                                         }
2169                                         return entry.Member;
2170                                 }
2171
2172                                 //
2173                                 // Check the arguments
2174                                 //
2175                                 if (cmpAttrs.Length != paramTypes.Length)
2176                                         continue;
2177
2178                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --) {
2179                                         if (!TypeManager.IsEqual (paramTypes [j], cmpAttrs [j]))
2180                                                 goto next;
2181                                 }
2182
2183                                 //
2184                                 // check generic arguments for methods
2185                                 //
2186                                 if (mi != null) {
2187                                         Type [] cmpGenArgs = mi.GetGenericArguments ();
2188                                         if (genericMethod != null && cmpGenArgs.Length > 0) {
2189                                                 if (genericMethod.TypeParameters.Length != cmpGenArgs.Length)
2190                                                         goto next;
2191                                         }
2192                                         else if (! (genericMethod == null && cmpGenArgs.Length == 0))
2193                                                 goto next;
2194                                 }
2195
2196                                 //
2197                                 // get one of the methods because this has the visibility info.
2198                                 //
2199                                 if (is_property) {
2200                                         mi = pi.GetGetMethod (true);
2201                                         if (mi == null)
2202                                                 mi = pi.GetSetMethod (true);
2203                                 }
2204
2205                                 //
2206                                 // Check visibility
2207                                 //
2208                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2209                                 case MethodAttributes.Private:
2210                                         //
2211                                         // A private method is Ok if we are a nested subtype.
2212                                         // The spec actually is not very clear about this, see bug 52458.
2213                                         //
2214                                         if (invocationType.Equals (entry.Container.Type) ||
2215                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2216                                                 return entry.Member;
2217
2218                                         break;
2219                                 case MethodAttributes.FamANDAssem:
2220                                 case MethodAttributes.Assembly:
2221                                         //
2222                                         // Check for assembly methods
2223                                         //
2224                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
2225                                                 return entry.Member;
2226
2227                                         break;
2228                                 default:
2229                                         //
2230                                         // A protected method is ok, because we are overriding.
2231                                         // public is always ok.
2232                                         //
2233                                         return entry.Member;
2234                                 }
2235                         next:
2236                                 ;
2237                         }
2238
2239                         return null;
2240                 }
2241
2242                 /// <summary>
2243                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2244                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2245                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2246                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2247                 /// </summary>
2248                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2249                 {
2250                         ArrayList applicable = null;
2251
2252                         if (method_hash != null)
2253                                 applicable = (ArrayList) method_hash [name];
2254
2255                         if (applicable != null) {
2256                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2257                                         CacheEntry entry = (CacheEntry) applicable [i];
2258                                         if ((entry.EntryType & EntryType.Public) != 0)
2259                                                 return entry.Member;
2260                                 }
2261                         }
2262
2263                         if (member_hash == null)
2264                                 return null;
2265                         applicable = (ArrayList) member_hash [name];
2266
2267                         if (applicable != null) {
2268                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2269                                         CacheEntry entry = (CacheEntry) applicable [i];
2270                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2271                                                 if (ignore_complex_types) {
2272                                                         if ((entry.EntryType & EntryType.Method) != 0)
2273                                                                 continue;
2274
2275                                                         // Does exist easier way how to detect indexer ?
2276                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2277                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
2278                                                                 if (arg_types.Length > 0)
2279                                                                         continue;
2280                                                         }
2281                                                 }
2282                                                 return entry.Member;
2283                                         }
2284                                 }
2285                         }
2286                         return null;
2287                 }
2288
2289                 Hashtable locase_table;
2290
2291                 /// <summary>
2292                 /// Builds low-case table for CLS Compliance test
2293                 /// </summary>
2294                 public Hashtable GetPublicMembers ()
2295                 {
2296                         if (locase_table != null)
2297                                 return locase_table;
2298
2299                         locase_table = new Hashtable ();
2300                         foreach (DictionaryEntry entry in member_hash) {
2301                                 ArrayList members = (ArrayList)entry.Value;
2302                                 for (int ii = 0; ii < members.Count; ++ii) {
2303                                         CacheEntry member_entry = (CacheEntry) members [ii];
2304
2305                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2306                                                 continue;
2307
2308                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2309                                         switch (member_entry.EntryType & EntryType.MaskType) {
2310                                                 case EntryType.Constructor:
2311                                                         continue;
2312
2313                                                 case EntryType.Field:
2314                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2315                                                                 continue;
2316                                                         break;
2317
2318                                                 case EntryType.Method:
2319                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2320                                                                 continue;
2321                                                         break;
2322
2323                                                 case EntryType.Property:
2324                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
2325                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2326                                                                 continue;
2327                                                         break;
2328
2329                                                 case EntryType.Event:
2330                                                         EventInfo ei = (EventInfo)member_entry.Member;
2331                                                         MethodInfo mi = ei.GetAddMethod ();
2332                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2333                                                                 continue;
2334                                                         break;
2335                                         }
2336                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2337                                         locase_table [lcase] = member_entry.Member;
2338                                         break;
2339                                 }
2340                         }
2341                         return locase_table;
2342                 }
2343
2344                 public Hashtable Members {
2345                         get {
2346                                 return member_hash;
2347                         }
2348                 }
2349
2350                 /// <summary>
2351                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2352                 /// </summary>
2353                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2354                 {
2355                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2356
2357                         for (int i = 0; i < al.Count; ++i) {
2358                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2359
2360                                 // skip itself
2361                                 if (entry.Member == this_builder)
2362                                         continue;
2363
2364                                 if ((entry.EntryType & tested_type) != tested_type)
2365                                         continue;
2366
2367                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2368                                 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
2369                                         method.ParameterTypes, TypeManager.GetParameterData (method_to_compare).Types);
2370
2371                                 if (result == AttributeTester.Result.Ok)
2372                                         continue;
2373
2374                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2375
2376                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2377                                 // However it is exactly what csc does.
2378                                 if (md != null && !md.IsClsComplianceRequired (method.Parent))
2379                                         continue;
2380
2381                                 Report.SymbolRelatedToPreviousError (entry.Member);
2382                                 switch (result) {
2383                                         case AttributeTester.Result.RefOutArrayError:
2384                                                 Report.Error (3006, method.Location, "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2385                                                 continue;
2386                                         case AttributeTester.Result.ArrayArrayError:
2387                                                 Report.Error (3007, method.Location, "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant", method.GetSignatureForError ());
2388                                                 continue;
2389                                 }
2390
2391                                 throw new NotImplementedException (result.ToString ());
2392                         }
2393                 }
2394         }
2395 }