mcs/mcs/decl.cs

   1 //
   2 // decl.cs: Declaration base class for structs, classes, enums and interfaces.
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10 // (C) 2004 Novell, Inc
  11 //
  12 // TODO: Move the method verification stuff from the class.cs and interface.cs here
  13 //
  14
  15 using System;
  16 using System.Text;
  17 using System.Collections;
  18 using System.Globalization;
  19 using System.Reflection.Emit;
  20 using System.Reflection;
  21
  22 #if BOOTSTRAP_WITH_OLDLIB
  23 using XmlElement = System.Object;
  24 #else
  25 using System.Xml;
  26 #endif
  27
  28 namespace Mono.CSharp {
  29
  30         public class MemberName {
  31                 public readonly string Name;
  32                 public readonly TypeArguments TypeArguments;
  33
  34                 public readonly MemberName Left;
  35                 public readonly Location Location;
  36
  37                 public static readonly MemberName Null = new MemberName ("");
  38
  39                 bool is_double_colon;
  40
  41                 private MemberName (MemberName left, string name, bool is_double_colon,
  42                                     Location loc)
  43                 {
  44                         this.Name = name;
  45                         this.Location = loc;
  46                         this.is_double_colon = is_double_colon;
  47                         this.Left = left;
  48                 }
  49
  50                 private MemberName (MemberName left, string name, bool is_double_colon,
  51                                     TypeArguments args, Location loc)
  52                         : this (left, name, is_double_colon, loc)
  53                 {
  54                         this.TypeArguments = args;
  55                 }
  56
  57                 public MemberName (string name)
  58                         : this (name, Location.Null)
  59                 { }
  60
  61                 public MemberName (string name, Location loc)
  62                         : this (null, name, false, loc)
  63                 { }
  64
  65                 public MemberName (string name, TypeArguments args, Location loc)
  66                         : this (null, name, false, args, loc)
  67                 { }
  68
  69                 public MemberName (MemberName left, string name)
  70                         : this (left, name, left != null ? left.Location : Location.Null)
  71                 { }
  72
  73                 public MemberName (MemberName left, string name, Location loc)
  74                         : this (left, name, false, loc)
  75                 { }
  76
  77                 public MemberName (MemberName left, string name, TypeArguments args, Location loc)
  78                         : this (left, name, false, args, loc)
  79                 { }
  80
  81                 public MemberName (string alias, string name, Location loc)
  82                         : this (new MemberName (alias, loc), name, true, loc)
  83                 { }
  84
  85                 public MemberName (MemberName left, MemberName right)
  86                         : this (left, right, right.Location)
  87                 { }
  88
  89                 public MemberName (MemberName left, MemberName right, Location loc)
  90                         : this (null, right.Name, false, right.TypeArguments, loc)
  91                 {
  92                         if (right.is_double_colon)
  93                                 throw new InternalErrorException ("Cannot append double_colon member name");
  94                         this.Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  95                 }
  96
  97                 public string GetName ()
  98                 {
  99                         return GetName (false);
 100                 }
 101
 102                 public bool IsGeneric {
 103                         get {
 104                                 if (TypeArguments != null)
 105                                         return true;
 106                                 else if (Left != null)
 107                                         return Left.IsGeneric;
 108                                 else
 109                                         return false;
 110                         }
 111                 }
 112
 113                 public string GetName (bool is_generic)
 114                 {
 115                         string name = is_generic ? Basename : Name;
 116                         string connect = is_double_colon ? "::" : ".";
 117                         if (Left != null)
 118                                 return Left.GetName (is_generic) + connect + name;
 119                         else
 120                                 return name;
 121                 }
 122
 123                 public string GetTypeName ()
 124                 {
 125                         string connect = is_double_colon ? "::" : ".";
 126                         if (Left != null)
 127                                 return Left.GetTypeName () + connect + MakeName (Name, TypeArguments);
 128                         else
 129                                 return MakeName (Name, TypeArguments);
 130                 }
 131
 132                 public Expression GetTypeExpression ()
 133                 {
 134                         if (Left == null) {
 135                                 if (TypeArguments != null)
 136                                         return new SimpleName (Basename, TypeArguments, Location);
 137
 138                                 if (RootContext.Version == LanguageVersion.LINQ && Name == "var")
 139                                         return new VarExpr (Name, Location);
 140
 141                                 return new SimpleName (Name, Location);
 142                         }
 143
 144                         if (is_double_colon) {
 145                                 if (Left.Left != null)
 146                                         throw new InternalErrorException ("The left side of a :: should be an identifier");
 147                                 return new QualifiedAliasMember (Left.Name, Name, Location);
 148                         }
 149
 150                         Expression lexpr = Left.GetTypeExpression ();
 151                         return new MemberAccess (lexpr, Name, TypeArguments, Location);
 152                 }
 153
 154                 public MemberName Clone ()
 155                 {
 156                         MemberName left_clone = Left == null ? null : Left.Clone ();
 157                         return new MemberName (left_clone, Name, is_double_colon, TypeArguments, Location);
 158                 }
 159
 160                 public string Basename {
 161                         get {
 162                                 if (TypeArguments != null)
 163                                         return MakeName (Name, TypeArguments);
 164                                 else
 165                                         return Name;
 166                         }
 167                 }
 168
 169                 public string FullName {
 170                         get {
 171                                 if (TypeArguments != null)
 172                                         return Name + "<" + TypeArguments + ">";
 173                                 else
 174                                         return Name;
 175                         }
 176                 }
 177
 178                 public string MethodName {
 179                         get {
 180                                 string connect = is_double_colon ? "::" : ".";
 181                                 if (Left != null)
 182                                         return Left.FullName + connect + Name;
 183                                 else
 184                                         return Name;
 185                         }
 186                 }
 187
 188                 public override string ToString ()
 189                 {
 190                         string connect = is_double_colon ? "::" : ".";
 191                         if (Left != null)
 192                                 return Left.FullName + connect + FullName;
 193                         else
 194                                 return FullName;
 195                 }
 196
 197                 public override bool Equals (object other)
 198                 {
 199                         return Equals (other as MemberName);
 200                 }
 201
 202                 public bool Equals (MemberName other)
 203                 {
 204                         if (this == other)
 205                                 return true;
 206                         if (other == null || Name != other.Name)
 207                                 return false;
 208                         if (is_double_colon != other.is_double_colon)
 209                                 return false;
 210
 211                         if ((TypeArguments != null) &&
 212                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 213                                 return false;
 214
 215                         if ((TypeArguments == null) && (other.TypeArguments != null))
 216                                 return false;
 217
 218                         if (Left == null)
 219                                 return other.Left == null;
 220
 221                         return Left.Equals (other.Left);
 222                 }
 223
 224                 public override int GetHashCode ()
 225                 {
 226                         int hash = Name.GetHashCode ();
 227                         for (MemberName n = Left; n != null; n = n.Left)
 228                                 hash ^= n.Name.GetHashCode ();
 229                         if (is_double_colon)
 230                                 hash ^= 0xbadc01d;
 231
 232                         if (TypeArguments != null)
 233                                 hash ^= TypeArguments.Count << 5;
 234
 235                         return hash & 0x7FFFFFFF;
 236                 }
 237
 238                 public int CountTypeArguments {
 239                         get {
 240                                 if (TypeArguments != null)
 241                                         return TypeArguments.Count;
 242                                 else if (Left != null)
 243                                         return Left.CountTypeArguments;
 244                                 else
 245                                         return 0;
 246                         }
 247                 }
 248
 249                 public static string MakeName (string name, TypeArguments args)
 250                 {
 251                         if (args == null)
 252                                 return name;
 253                         else
 254                                 return name + "`" + args.Count;
 255                 }
 256
 257                 public static string MakeName (string name, int count)
 258                 {
 259                         return name + "`" + count;
 260                 }
 261         }
 262
 263         /// <summary>
 264         ///   Base representation for members.  This is used to keep track
 265         ///   of Name, Location and Modifier flags, and handling Attributes.
 266         /// </summary>
 267         public abstract class MemberCore : Attributable, IResolveContext {
 268                 /// <summary>
 269                 ///   Public name
 270                 /// </summary>
 271
 272                 protected string cached_name;
 273                 public string Name {
 274                         get {
 275                                 if (cached_name == null)
 276                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 277                                 return cached_name;
 278                         }
 279                 }
 280
 281                 // Is not readonly because of IndexerName attribute
 282                 private MemberName member_name;
 283                 public MemberName MemberName {
 284                         get { return member_name; }
 285                 }
 286
 287                 /// <summary>
 288                 ///   Modifier flags that the user specified in the source code
 289                 /// </summary>
 290                 private int mod_flags;
 291                 public int ModFlags {
 292                         set {
 293                                 mod_flags = value;
 294                                 if ((value & Modifiers.COMPILER_GENERATED) != 0)
 295                                         caching_flags = Flags.IsUsed | Flags.IsAssigned;
 296                         }
 297                         get {
 298                                 return mod_flags;
 299                         }
 300                 }
 301
 302                 public readonly DeclSpace Parent;
 303
 304                 /// <summary>
 305                 ///   Location where this declaration happens
 306                 /// </summary>
 307                 public Location Location {
 308                         get { return member_name.Location; }
 309                 }
 310
 311                 /// <summary>
 312                 ///   XML documentation comment
 313                 /// </summary>
 314                 protected string comment;
 315
 316                 /// <summary>
 317                 ///   Represents header string for documentation comment
 318                 ///   for each member types.
 319                 /// </summary>
 320                 public abstract string DocCommentHeader { get; }
 321
 322                 [Flags]
 323                 public enum Flags {
 324                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 325                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 326                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 327                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 328                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 329                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 330                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 331                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 332                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 333                         Excluded = 1 << 9,                                      // Method is conditional
 334                         TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
 335                         IsUsed = 1 << 11,
 336                         IsAssigned = 1 << 12,                           // Field is assigned
 337                         HasExplicitLayout       = 1 << 13
 338                 }
 339
 340                 /// <summary>
 341                 ///   MemberCore flags at first detected then cached
 342                 /// </summary>
 343                 internal Flags caching_flags;
 344
 345                 public MemberCore (DeclSpace parent, MemberName name, Attributes attrs)
 346                         : base (attrs)
 347                 {
 348                         this.Parent = parent;
 349                         member_name = name;
 350                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 351                 }
 352
 353                 protected virtual void SetMemberName (MemberName new_name)
 354                 {
 355                         member_name = new_name;
 356                         cached_name = null;
 357                 }
 358
 359                 protected bool CheckAbstractAndExtern (bool has_block)
 360                 {
 361                         if (Parent.PartialContainer.Kind == Kind.Interface)
 362                                 return true;
 363
 364                         if (has_block) {
 365                                 if ((ModFlags & Modifiers.EXTERN) != 0) {
 366                                         Report.Error (179, Location, "`{0}' cannot declare a body because it is marked extern",
 367                                                 GetSignatureForError ());
 368                                         return false;
 369                                 }
 370
 371                                 if ((ModFlags & Modifiers.ABSTRACT) != 0) {
 372                                         Report.Error (500, Location, "`{0}' cannot declare a body because it is marked abstract",
 373                                                 GetSignatureForError ());
 374                                         return false;
 375                                 }
 376                         } else {
 377                                 if ((ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN)) == 0) {
 378                                         if (RootContext.Version >= LanguageVersion.LINQ && this is Property.PropertyMethod) {
 379                                                 Report.Error (840, Location, "`{0}' must have a body because it is not marked abstract or extern. The property can be automatically implemented when you define both accessors",
 380                                                               GetSignatureForError ());
 381                                         } else {
 382                                                 Report.Error (501, Location, "`{0}' must have a body because it is not marked abstract or extern",
 383                                                               GetSignatureForError ());
 384                                         }
 385                                         return false;
 386                                 }
 387                         }
 388
 389                         return true;
 390                 }
 391
 392                 public abstract bool Define ();
 393
 394                 public virtual string DocComment {
 395                         get {
 396                                 return comment;
 397                         }
 398                         set {
 399                                 comment = value;
 400                         }
 401                 }
 402
 403                 //
 404                 // Returns full member name for error message
 405                 //
 406                 public virtual string GetSignatureForError ()
 407                 {
 408                         if (Parent == null || Parent.Parent == null)
 409                                 return member_name.ToString ();
 410
 411                         return String.Concat (Parent.GetSignatureForError (), '.', member_name.ToString ());
 412                 }
 413
 414                 /// <summary>
 415                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 416                 /// </summary>
 417                 public virtual void Emit ()
 418                 {
 419                         if (!RootContext.VerifyClsCompliance)
 420                                 return;
 421
 422                         VerifyClsCompliance ();
 423                 }
 424
 425                 public virtual bool IsUsed {
 426                         get { return (caching_flags & Flags.IsUsed) != 0; }
 427                 }
 428
 429                 public void SetMemberIsUsed ()
 430                 {
 431                         caching_flags |= Flags.IsUsed;
 432                 }
 433
 434                 /// <summary>
 435                 /// Returns instance of ObsoleteAttribute for this MemberCore
 436                 /// </summary>
 437                 public virtual ObsoleteAttribute GetObsoleteAttribute ()
 438                 {
 439                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 440                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 441                                 return null;
 442                         }
 443
 444                         caching_flags &= ~Flags.Obsolete_Undetected;
 445
 446                         if (OptAttributes == null)
 447                                 return null;
 448
 449                         Attribute obsolete_attr = OptAttributes.Search (
 450                                 TypeManager.obsolete_attribute_type);
 451                         if (obsolete_attr == null)
 452                                 return null;
 453
 454                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute ();
 455                         if (obsolete == null)
 456                                 return null;
 457
 458                         caching_flags |= Flags.Obsolete;
 459                         return obsolete;
 460                 }
 461
 462                 /// <summary>
 463                 /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
 464                 /// </summary>
 465                 public virtual void CheckObsoleteness (Location loc)
 466                 {
 467                         if (Parent != null)
 468                                 Parent.CheckObsoleteness (loc);
 469
 470                         ObsoleteAttribute oa = GetObsoleteAttribute ();
 471                         if (oa == null) {
 472                                 return;
 473                         }
 474
 475                         AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc);
 476                 }
 477
 478                 /// <summary>
 479                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 480                 /// </summary>
 481                 public override bool IsClsComplianceRequired ()
 482                 {
 483                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 484                                 return (caching_flags & Flags.ClsCompliant) != 0;
 485
 486                         if (GetClsCompliantAttributeValue () && IsExposedFromAssembly ()) {
 487                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 488                                 caching_flags |= Flags.ClsCompliant;
 489                                 return true;
 490                         }
 491
 492                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 493                         return false;
 494                 }
 495
 496                 /// <summary>
 497                 /// Returns true when MemberCore is exposed from assembly.
 498                 /// </summary>
 499                 public bool IsExposedFromAssembly ()
 500                 {
 501                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 502                                 return false;
 503
 504                         DeclSpace parentContainer = Parent;
 505                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 506                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 507                                         return false;
 508                                 parentContainer = parentContainer.Parent;
 509                         }
 510                         return true;
 511                 }
 512
 513                 /// <summary>
 514                 /// Goes through class hierarchy and gets value of first found CLSCompliantAttribute.
 515                 /// If no is attribute exists then assembly CLSCompliantAttribute is returned.
 516                 /// </summary>
 517                 public virtual bool GetClsCompliantAttributeValue ()
 518                 {
 519                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
 520                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
 521
 522                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
 523
 524                         if (OptAttributes != null) {
 525                                 Attribute cls_attribute = OptAttributes.Search (
 526                                         TypeManager.cls_compliant_attribute_type);
 527                                 if (cls_attribute != null) {
 528                                         caching_flags |= Flags.HasClsCompliantAttribute;
 529                                         bool value = cls_attribute.GetClsCompliantAttributeValue ();
 530                                         if (value)
 531                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 532                                         return value;
 533                                 }
 534                         }
 535
 536                         if (Parent.GetClsCompliantAttributeValue ()) {
 537                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 538                                 return true;
 539                         }
 540                         return false;
 541                 }
 542
 543                 /// <summary>
 544                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 545                 /// </summary>
 546                 protected bool HasClsCompliantAttribute {
 547                         get {
 548                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 549                         }
 550                 }
 551
 552                 /// <summary>
 553                 /// It helps to handle error 102 & 111 detection
 554                 /// </summary>
 555                 public virtual bool MarkForDuplicationCheck ()
 556                 {
 557                         return false;
 558                 }
 559
 560                 /// <summary>
 561                 /// The main virtual method for CLS-Compliant verifications.
 562                 /// The method returns true if member is CLS-Compliant and false if member is not
 563                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 564                 /// and add their extra verifications.
 565                 /// </summary>
 566                 protected virtual bool VerifyClsCompliance ()
 567                 {
 568                         if (!IsClsComplianceRequired ()) {
 569                                 if (HasClsCompliantAttribute && Report.WarningLevel >= 2) {
 570                                         if (!IsExposedFromAssembly ())
 571                                                 Report.Warning (3019, 2, Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
 572                                         if (!CodeGen.Assembly.IsClsCompliant)
 573                                                 Report.Warning (3021, 2, Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
 574                                 }
 575                                 return false;
 576                         }
 577
 578                         if (HasClsCompliantAttribute) {
 579                                 if (CodeGen.Assembly.ClsCompliantAttribute == null && !CodeGen.Assembly.IsClsCompliant) {
 580                                         Report.Error (3014, Location,
 581                                                 "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 582                                                 GetSignatureForError ());
 583                                         return false;
 584                                 }
 585
 586                                 if (!Parent.IsClsComplianceRequired ()) {
 587                                         Report.Warning (3018, 1, Location, "`{0}' cannot be marked as CLS-compliant because it is a member of non CLS-compliant type `{1}'",
 588                                                 GetSignatureForError (), Parent.GetSignatureForError ());
 589                                         return false;
 590                                 }
 591                         }
 592
 593                         if (member_name.Name [0] == '_') {
 594                                 Report.Error (3008, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 595                         }
 596                         return true;
 597                 }
 598
 599                 //
 600                 // Raised (and passed an XmlElement that contains the comment)
 601                 // when GenerateDocComment is writing documentation expectedly.
 602                 //
 603                 internal virtual void OnGenerateDocComment (XmlElement intermediateNode)
 604                 {
 605                 }
 606
 607                 //
 608                 // Returns a string that represents the signature for this
 609                 // member which should be used in XML documentation.
 610                 //
 611                 public virtual string GetDocCommentName (DeclSpace ds)
 612                 {
 613                         if (ds == null || this is DeclSpace)
 614                                 return DocCommentHeader + Name;
 615                         else
 616                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 617                 }
 618
 619                 //
 620                 // Generates xml doc comments (if any), and if required,
 621                 // handle warning report.
 622                 //
 623                 internal virtual void GenerateDocComment (DeclSpace ds)
 624                 {
 625                         DocUtil.GenerateDocComment (this, ds);
 626                 }
 627
 628                 public override IResolveContext ResolveContext {
 629                         get { return this; }
 630                 }
 631
 632                 #region IResolveContext Members
 633
 634                 public DeclSpace DeclContainer {
 635                         get { return Parent; }
 636                 }
 637
 638                 public virtual DeclSpace GenericDeclContainer {
 639                         get { return DeclContainer; }
 640                 }
 641
 642                 public bool IsInObsoleteScope {
 643                         get {
 644                                 if (GetObsoleteAttribute () != null)
 645                                         return true;
 646
 647                                 return Parent == null ? false : Parent.IsInObsoleteScope;
 648                         }
 649                 }
 650
 651                 public bool IsInUnsafeScope {
 652                         get {
 653                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 654                                         return true;
 655
 656                                 return Parent == null ? false : Parent.IsInUnsafeScope;
 657                         }
 658                 }
 659
 660                 #endregion
 661         }
 662
 663         /// <summary>
 664         ///   Base class for structs, classes, enumerations and interfaces.
 665         /// </summary>
 666         /// <remarks>
 667         ///   They all create new declaration spaces.  This
 668         ///   provides the common foundation for managing those name
 669         ///   spaces.
 670         /// </remarks>
 671         public abstract class DeclSpace : MemberCore {
 672                 /// <summary>
 673                 ///   This points to the actual definition that is being
 674                 ///   created with System.Reflection.Emit
 675                 /// </summary>
 676                 public TypeBuilder TypeBuilder;
 677
 678                 /// <summary>
 679                 ///   If we are a generic type, this is the type we are
 680                 ///   currently defining.  We need to lookup members on this
 681                 ///   instead of the TypeBuilder.
 682                 /// </summary>
 683                 public Type CurrentType;
 684
 685                 //
 686                 // This is the namespace in which this typecontainer
 687                 // was declared.  We use this to resolve names.
 688                 //
 689                 public NamespaceEntry NamespaceEntry;
 690
 691                 private Hashtable Cache = new Hashtable ();
 692
 693                 public readonly string Basename;
 694
 695                 protected Hashtable defined_names;
 696
 697                 public TypeContainer PartialContainer;
 698
 699                 readonly bool is_generic;
 700                 readonly int count_type_params;
 701                 readonly int count_current_type_params;
 702
 703                 //
 704                 // Whether we are Generic
 705                 //
 706                 public bool IsGeneric {
 707                         get {
 708                                 if (is_generic)
 709                                         return true;
 710                                 else if (Parent != null)
 711                                         return Parent.IsGeneric;
 712                                 else
 713                                         return false;
 714                         }
 715                 }
 716
 717                 static string[] attribute_targets = new string [] { "type" };
 718
 719                 public DeclSpace (NamespaceEntry ns, DeclSpace parent, MemberName name,
 720                                   Attributes attrs)
 721                         : base (parent, name, attrs)
 722                 {
 723                         NamespaceEntry = ns;
 724                         Basename = name.Basename;
 725                         defined_names = new Hashtable ();
 726                         PartialContainer = null;
 727                         if (name.TypeArguments != null) {
 728                                 is_generic = true;
 729                                 count_type_params = count_current_type_params = name.TypeArguments.Count;
 730                         }
 731                         if (parent != null)
 732                                 count_type_params += parent.count_type_params;
 733                 }
 734
 735                 public override DeclSpace GenericDeclContainer {
 736                         get { return this; }
 737                 }
 738
 739                 /// <summary>
 740                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 741                 /// </summary>
 742                 protected virtual bool AddToContainer (MemberCore symbol, string name)
 743                 {
 744                         MemberCore mc = (MemberCore) defined_names [name];
 745
 746                         if (mc == null) {
 747                                 defined_names.Add (name, symbol);
 748                                 return true;
 749                         }
 750
 751                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 752                                 return true;
 753
 754                         Report.SymbolRelatedToPreviousError (mc);
 755                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
 756                                 Error_MissingPartialModifier (symbol);
 757                                 return false;
 758                         }
 759
 760                         if (this is RootTypes) {
 761                                 Report.Error (101, symbol.Location,
 762                                         "The namespace `{0}' already contains a definition for `{1}'",
 763                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
 764                         } else if (symbol is TypeParameter) {
 765                                 Report.Error (692, symbol.Location,
 766                                               "Duplicate type parameter `{0}'", name);
 767                         } else {
 768                                 Report.Error (102, symbol.Location,
 769                                               "The type `{0}' already contains a definition for `{1}'",
 770                                               GetSignatureForError (), symbol.MemberName.Name);
 771                         }
 772
 773                         return false;
 774                 }
 775
 776                 /// <summary>
 777                 ///   Returns the MemberCore associated with a given name in the declaration
 778                 ///   space. It doesn't return method based symbols !!
 779                 /// </summary>
 780                 ///
 781                 public MemberCore GetDefinition (string name)
 782                 {
 783                         return (MemberCore)defined_names [name];
 784                 }
 785
 786                 public bool IsStaticClass {
 787                         get { return (ModFlags & Modifiers.STATIC) != 0; }
 788                 }
 789
 790                 //
 791                 // root_types contains all the types.  All TopLevel types
 792                 // hence have a parent that points to `root_types', that is
 793                 // why there is a non-obvious test down here.
 794                 //
 795                 public bool IsTopLevel {
 796                         get { return (Parent != null && Parent.Parent == null); }
 797                 }
 798
 799                 public virtual void CloseType ()
 800                 {
 801                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 802                                 try {
 803                                         TypeBuilder.CreateType ();
 804                                 } catch {
 805                                         //
 806                                         // The try/catch is needed because
 807                                         // nested enumerations fail to load when they
 808                                         // are defined.
 809                                         //
 810                                         // Even if this is the right order (enumerations
 811                                         // declared after types).
 812                                         //
 813                                         // Note that this still creates the type and
 814                                         // it is possible to save it
 815                                 }
 816                                 caching_flags |= Flags.CloseTypeCreated;
 817                         }
 818                 }
 819
 820                 protected virtual TypeAttributes TypeAttr {
 821                         get { return CodeGen.Module.DefaultCharSetType; }
 822                 }
 823
 824                 /// <remarks>
 825                 ///  Should be overriten by the appropriate declaration space
 826                 /// </remarks>
 827                 public abstract TypeBuilder DefineType ();
 828
 829                 /// <summary>
 830                 ///   Define all members, but don't apply any attributes or do anything which may
 831                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 832                 /// </summary>
 833                 public virtual bool DefineMembers ()
 834                 {
 835                         if (((ModFlags & Modifiers.NEW) != 0) && IsTopLevel) {
 836                                 Report.Error (1530, Location, "Keyword `new' is not allowed on namespace elements");
 837                                 return false;
 838                         }
 839                         return true;
 840                 }
 841
 842                 protected void Error_MissingPartialModifier (MemberCore type)
 843                 {
 844                         Report.Error (260, type.Location,
 845                                 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
 846                                 type.GetSignatureForError ());
 847                 }
 848
 849                 public override string GetSignatureForError ()
 850                 {
 851                         if (IsGeneric) {
 852                                 return SimpleName.RemoveGenericArity (Name) + TypeParameter.GetSignatureForError (CurrentTypeParameters);
 853                         }
 854                         // Parent.GetSignatureForError
 855                         return Name;
 856                 }
 857
 858                 public bool CheckAccessLevel (Type check_type)
 859                 {
 860                         TypeBuilder tb;
 861                         if (this is GenericMethod)
 862                                 tb = Parent.TypeBuilder;
 863                         else
 864                                 tb = TypeBuilder;
 865
 866                         check_type = TypeManager.DropGenericTypeArguments (check_type);
 867                         if (check_type == tb)
 868                                 return true;
 869
 870                         if (TypeBuilder == null)
 871                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 872                                 //        However, this is invoked again later -- so safe to return true.
 873                                 //        May also be null when resolving top-level attributes.
 874                                 return true;
 875
 876                         //
 877                         // Broken Microsoft runtime, return public for arrays, no matter what
 878                         // the accessibility is for their underlying class, and they return
 879                         // NonPublic visibility for pointers
 880                         //
 881                         if (check_type.IsArray || check_type.IsPointer)
 882                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 883
 884                         if (TypeManager.IsGenericParameter(check_type))
 885                                 return true; // FIXME
 886
 887                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 888
 889                         switch (check_attr){
 890                         case TypeAttributes.Public:
 891                                 return true;
 892
 893                         case TypeAttributes.NotPublic:
 894
 895                                 if (TypeBuilder == null)
 896                                         // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 897                                         //        However, this is invoked again later -- so safe to return true.
 898                                         //        May also be null when resolving top-level attributes.
 899                                         return true;
 900                                 //
 901                                 // This test should probably use the declaringtype.
 902                                 //
 903                                 return check_type.Assembly == TypeBuilder.Assembly ||
 904                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 905
 906                         case TypeAttributes.NestedPublic:
 907                                 return true;
 908
 909                         case TypeAttributes.NestedPrivate:
 910                                 return NestedAccessible (tb, check_type);
 911
 912                         case TypeAttributes.NestedFamily:
 913                                 //
 914                                 // Only accessible to methods in current type or any subtypes
 915                                 //
 916                                 return FamilyAccessible (tb, check_type);
 917
 918                         case TypeAttributes.NestedFamANDAssem:
 919                                 return ((check_type.Assembly == tb.Assembly) ||
 920                                                 TypeManager.IsFriendAssembly (check_type.Assembly)) &&
 921                                         FamilyAccessible (tb, check_type);
 922
 923                         case TypeAttributes.NestedFamORAssem:
 924                                 return (check_type.Assembly == tb.Assembly) ||
 925                                         FamilyAccessible (tb, check_type) ||
 926                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 927
 928                         case TypeAttributes.NestedAssembly:
 929                                 return check_type.Assembly == tb.Assembly ||
 930                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 931                         }
 932
 933                         Console.WriteLine ("HERE: " + check_attr);
 934                         return false;
 935
 936                 }
 937
 938                 protected bool NestedAccessible (Type tb, Type check_type)
 939                 {
 940                         Type declaring = check_type.DeclaringType;
 941                         return TypeBuilder == declaring ||
 942                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 943                 }
 944
 945                 protected bool FamilyAccessible (Type tb, Type check_type)
 946                 {
 947                         Type declaring = check_type.DeclaringType;
 948                         return TypeManager.IsNestedFamilyAccessible (TypeBuilder, declaring);
 949                 }
 950
 951                 // Access level of a type.
 952                 const int X = 1;
 953                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 954                         // Public    Assembly   Protected
 955                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 956                         Public              = (X << 0) | (X << 1) | (X << 2),
 957                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 958                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 959                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 960                 }
 961
 962                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 963                 {
 964                         if ((flags & Modifiers.INTERNAL) != 0) {
 965
 966                                 if ((flags & Modifiers.PROTECTED) != 0)
 967                                         return AccessLevel.ProtectedOrInternal;
 968                                 else
 969                                         return AccessLevel.Internal;
 970
 971                         } else if ((flags & Modifiers.PROTECTED) != 0)
 972                                 return AccessLevel.Protected;
 973                         else if ((flags & Modifiers.PRIVATE) != 0)
 974                                 return AccessLevel.Private;
 975                         else
 976                                 return AccessLevel.Public;
 977                 }
 978
 979                 // What is the effective access level of this?
 980                 // TODO: Cache this?
 981                 AccessLevel EffectiveAccessLevel {
 982                         get {
 983                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 984                                 if (!IsTopLevel && (Parent != null))
 985                                         return myAccess & Parent.EffectiveAccessLevel;
 986                                 return myAccess;
 987                         }
 988                 }
 989
 990                 // Return the access level for type `t'
 991                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 992                 {
 993                         if (t.IsPublic)
 994                                 return AccessLevel.Public;
 995                         if (t.IsNestedPrivate)
 996                                 return AccessLevel.Private;
 997                         if (t.IsNotPublic)
 998                                 return AccessLevel.Internal;
 999
1000                         // By now, it must be nested
1001                         AccessLevel parent_level = TypeEffectiveAccessLevel (t.DeclaringType);
1002
1003                         if (t.IsNestedPublic)
1004                                 return parent_level;
1005                         if (t.IsNestedAssembly)
1006                                 return parent_level & AccessLevel.Internal;
1007                         if (t.IsNestedFamily)
1008                                 return parent_level & AccessLevel.Protected;
1009                         if (t.IsNestedFamORAssem)
1010                                 return parent_level & AccessLevel.ProtectedOrInternal;
1011                         if (t.IsNestedFamANDAssem)
1012                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
1013
1014                         // nested private is taken care of
1015
1016                         throw new Exception ("I give up, what are you?");
1017                 }
1018
1019                 //
1020                 // This answers `is the type P, as accessible as a member M which has the
1021                 // accessability @flags which is declared as a nested member of the type T, this declspace'
1022                 //
1023                 public bool AsAccessible (Type p, int flags)
1024                 {
1025                         //
1026                         // 1) if M is private, its accessability is the same as this declspace.
1027                         // we already know that P is accessible to T before this method, so we
1028                         // may return true.
1029                         //
1030
1031                         if ((flags & Modifiers.PRIVATE) != 0)
1032                                 return true;
1033
1034                         while (p.IsArray || p.IsPointer || p.IsByRef)
1035                                 p = TypeManager.GetElementType (p);
1036
1037 #if GMCS_SOURCE
1038                         if (p.IsGenericParameter)
1039                                 return true;
1040
1041                         if (TypeManager.IsGenericType (p)) {
1042                                 foreach (Type t in p.GetGenericArguments ()) {
1043                                         if (!AsAccessible (t, flags))
1044                                                 return false;
1045                                 }
1046                         }
1047 #endif
1048                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
1049                         AccessLevel mAccess = this.EffectiveAccessLevel &
1050                                 GetAccessLevelFromModifiers (flags);
1051
1052                         // for every place from which we can access M, we must
1053                         // be able to access P as well. So, we want
1054                         // For every bit in M and P, M_i -> P_1 == true
1055                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
1056
1057                         return ~ (~ mAccess | pAccess) == 0;
1058                 }
1059
1060                 private Type LookupNestedTypeInHierarchy (string name)
1061                 {
1062                         // if the member cache has been created, lets use it.
1063                         // the member cache is MUCH faster.
1064                         if (MemberCache != null)
1065                                 return MemberCache.FindNestedType (name);
1066
1067                         // no member cache. Do it the hard way -- reflection
1068                         Type t = null;
1069                         for (Type current_type = TypeBuilder;
1070                              current_type != null && current_type != TypeManager.object_type;
1071                              current_type = current_type.BaseType) {
1072
1073                                 Type ct = TypeManager.DropGenericTypeArguments (current_type);
1074                                 if (ct is TypeBuilder) {
1075                                         TypeContainer tc = ct == TypeBuilder
1076                                                 ? PartialContainer : TypeManager.LookupTypeContainer (ct);
1077                                         if (tc != null)
1078                                                 t = tc.FindNestedType (name);
1079                                 } else {
1080                                         t = TypeManager.GetNestedType (ct, name);
1081                                 }
1082
1083                                 if ((t == null) || !CheckAccessLevel (t))
1084                                         continue;
1085
1086 #if GMCS_SOURCE
1087                                 if (!TypeManager.IsGenericType (current_type))
1088                                         return t;
1089
1090                                 Type[] args = TypeManager.GetTypeArguments (current_type);
1091                                 Type[] targs = TypeManager.GetTypeArguments (t);
1092                                 for (int i = 0; i < args.Length; i++)
1093                                         targs [i] = args [i];
1094
1095                                 t = t.MakeGenericType (targs);
1096 #endif
1097
1098                                 return t;
1099                         }
1100
1101                         return null;
1102                 }
1103
1104                 public virtual ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name)
1105                 {
1106                         return null;
1107                 }
1108
1109                 //
1110                 // Public function used to locate types.
1111                 //
1112                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1113                 //
1114                 // Returns: Type or null if they type can not be found.
1115                 //
1116                 public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
1117                 {
1118                         if (Cache.Contains (name))
1119                                 return (FullNamedExpression) Cache [name];
1120
1121                         FullNamedExpression e;
1122                         Type t = LookupNestedTypeInHierarchy (name);
1123                         if (t != null)
1124                                 e = new TypeExpression (t, Location.Null);
1125                         else if (Parent != null)
1126                                 e = Parent.LookupNamespaceOrType (name, loc, ignore_cs0104);
1127                         else
1128                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
1129
1130                         Cache [name] = e;
1131                         return e;
1132                 }
1133
1134                 /// <remarks>
1135                 ///   This function is broken and not what you're looking for.  It should only
1136                 ///   be used while the type is still being created since it doesn't use the cache
1137                 ///   and relies on the filter doing the member name check.
1138                 /// </remarks>
1139                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1140                                                         MemberFilter filter, object criteria);
1141
1142                 /// <remarks>
1143                 ///   If we have a MemberCache, return it.  This property may return null if the
1144                 ///   class doesn't have a member cache or while it's still being created.
1145                 /// </remarks>
1146                 public abstract MemberCache MemberCache {
1147                         get;
1148                 }
1149
1150                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1151                 {
1152                         if (a.Type == TypeManager.required_attr_type) {
1153                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1154                                 return;
1155                         }
1156                         TypeBuilder.SetCustomAttribute (cb);
1157                 }
1158
1159                 //
1160                 // Extensions for generics
1161                 //
1162                 TypeParameter[] type_params;
1163                 TypeParameter[] type_param_list;
1164
1165                 protected string GetInstantiationName ()
1166                 {
1167                         StringBuilder sb = new StringBuilder (Name);
1168                         sb.Append ("<");
1169                         for (int i = 0; i < type_param_list.Length; i++) {
1170                                 if (i > 0)
1171                                         sb.Append (",");
1172                                 sb.Append (type_param_list [i].Name);
1173                         }
1174                         sb.Append (">");
1175                         return sb.ToString ();
1176                 }
1177
1178                 bool check_type_parameter (ArrayList list, int start, string name)
1179                 {
1180                         for (int i = 0; i < start; i++) {
1181                                 TypeParameter param = (TypeParameter) list [i];
1182
1183                                 if (param.Name != name)
1184                                         continue;
1185
1186                                 Report.SymbolRelatedToPreviousError (Parent);
1187                                 // TODO: Location is wrong (parent instead of child)
1188                                 Report.Warning (693, 3, Location,
1189                                         "Type parameter `{0}' has the same name as the type parameter from outer type `{1}'",
1190                                         name, Parent.GetSignatureForError ());
1191
1192                                 return false;
1193                         }
1194
1195                         return true;
1196                 }
1197
1198                 TypeParameter[] initialize_type_params ()
1199                 {
1200                         if (type_param_list != null)
1201                                 return type_param_list;
1202
1203                         DeclSpace the_parent = Parent;
1204                         if (this is GenericMethod)
1205                                 the_parent = null;
1206
1207                         int start = 0;
1208                         ArrayList list = new ArrayList ();
1209                         if (the_parent != null && the_parent.IsGeneric) {
1210                                 // FIXME: move generics info out of DeclSpace
1211                                 TypeParameter[] parent_params = the_parent.PartialContainer.TypeParameters;
1212                                 start = parent_params.Length;
1213                                 list.AddRange (parent_params);
1214                         }
1215
1216                         int count = type_params != null ? type_params.Length : 0;
1217                         for (int i = 0; i < count; i++) {
1218                                 TypeParameter param = type_params [i];
1219                                 check_type_parameter (list, start, param.Name);
1220                                 list.Add (param);
1221                         }
1222
1223                         type_param_list = new TypeParameter [list.Count];
1224                         list.CopyTo (type_param_list, 0);
1225                         return type_param_list;
1226                 }
1227
1228                 public virtual void SetParameterInfo (ArrayList constraints_list)
1229                 {
1230                         if (!is_generic) {
1231                                 if (constraints_list != null) {
1232                                         Report.Error (
1233                                                 80, Location, "Constraints are not allowed " +
1234                                                 "on non-generic declarations");
1235                                 }
1236
1237                                 return;
1238                         }
1239
1240                         TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1241                         type_params = new TypeParameter [names.Length];
1242
1243                         //
1244                         // Register all the names
1245                         //
1246                         for (int i = 0; i < type_params.Length; i++) {
1247                                 TypeParameterName name = names [i];
1248
1249                                 Constraints constraints = null;
1250                                 if (constraints_list != null) {
1251                                         int total = constraints_list.Count;
1252                                         for (int ii = 0; ii < total; ++ii) {
1253                                                 Constraints constraints_at = (Constraints)constraints_list[ii];
1254                                                 // TODO: it is used by iterators only
1255                                                 if (constraints_at == null) {
1256                                                         constraints_list.RemoveAt (ii);
1257                                                         --total;
1258                                                         continue;
1259                                                 }
1260                                                 if (constraints_at.TypeParameter == name.Name) {
1261                                                         constraints = constraints_at;
1262                                                         constraints_list.RemoveAt(ii);
1263                                                         break;
1264                                                 }
1265                                         }
1266                                 }
1267
1268                                 type_params [i] = new TypeParameter (
1269                                         Parent, this, name.Name, constraints, name.OptAttributes,
1270                                         Location);
1271
1272                                 AddToContainer (type_params [i], name.Name);
1273                         }
1274
1275                         if (constraints_list != null && constraints_list.Count > 0) {
1276                                 foreach (Constraints constraint in constraints_list) {
1277                                         Report.Error(699, constraint.Location, "`{0}': A constraint references nonexistent type parameter `{1}'",
1278                                                 GetSignatureForError (), constraint.TypeParameter);
1279                                 }
1280                         }
1281                 }
1282
1283                 public TypeParameter[] TypeParameters {
1284                         get {
1285                                 if (!IsGeneric)
1286                                         throw new InvalidOperationException ();
1287                                 if ((PartialContainer != null) && (PartialContainer != this))
1288                                         return PartialContainer.TypeParameters;
1289                                 if (type_param_list == null)
1290                                         initialize_type_params ();
1291
1292                                 return type_param_list;
1293                         }
1294                 }
1295
1296                 public TypeParameter[] CurrentTypeParameters {
1297                         get {
1298                                 if (!IsGeneric)
1299                                         throw new InvalidOperationException ();
1300                                 if ((PartialContainer != null) && (PartialContainer != this))
1301                                         return PartialContainer.CurrentTypeParameters;
1302                                 if (type_params != null)
1303                                         return type_params;
1304                                 else
1305                                         return new TypeParameter [0];
1306                         }
1307                 }
1308
1309                 public int CountTypeParameters {
1310                         get {
1311                                 return count_type_params;
1312                         }
1313                 }
1314
1315                 public int CountCurrentTypeParameters {
1316                         get {
1317                                 return count_current_type_params;
1318                         }
1319                 }
1320
1321                 public TypeParameterExpr LookupGeneric (string name, Location loc)
1322                 {
1323                         if (!IsGeneric)
1324                                 return null;
1325
1326                         TypeParameter [] current_params;
1327                         if (this is TypeContainer)
1328                                 current_params = PartialContainer.CurrentTypeParameters;
1329                         else
1330                                 current_params = CurrentTypeParameters;
1331
1332                         foreach (TypeParameter type_param in current_params) {
1333                                 if (type_param.Name == name)
1334                                         return new TypeParameterExpr (type_param, loc);
1335                         }
1336
1337                         if (Parent != null)
1338                                 return Parent.LookupGeneric (name, loc);
1339
1340                         return null;
1341                 }
1342
1343                 // Used for error reporting only
1344                 public virtual Type LookupAnyGeneric (string typeName)
1345                 {
1346                         return NamespaceEntry.NS.LookForAnyGenericType (typeName);
1347                 }
1348
1349                 public override string[] ValidAttributeTargets {
1350                         get { return attribute_targets; }
1351                 }
1352
1353                 protected override bool VerifyClsCompliance ()
1354                 {
1355                         if (!base.VerifyClsCompliance ()) {
1356                                 return false;
1357                         }
1358
1359                         if (type_params != null) {
1360                                 foreach (TypeParameter tp in type_params) {
1361                                         if (tp.Constraints == null)
1362                                                 continue;
1363
1364                                         tp.Constraints.VerifyClsCompliance ();
1365                                 }
1366                         }
1367
1368                         IDictionary cache = TypeManager.AllClsTopLevelTypes;
1369                         if (cache == null)
1370                                 return true;
1371
1372                         string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1373                         if (!cache.Contains (lcase)) {
1374                                 cache.Add (lcase, this);
1375                                 return true;
1376                         }
1377
1378                         object val = cache [lcase];
1379                         if (val == null) {
1380                                 Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
1381                                 if (t == null)
1382                                         return true;
1383                                 Report.SymbolRelatedToPreviousError (t);
1384                         }
1385                         else {
1386                                 Report.SymbolRelatedToPreviousError ((DeclSpace)val);
1387                         }
1388 #if GMCS_SOURCE
1389                         Report.Warning (3005, 1, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1390 #else
1391                         Report.Error (3005, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1392 #endif
1393                         return true;
1394                 }
1395         }
1396
1397         /// <summary>
1398         ///   This is a readonly list of MemberInfo's.
1399         /// </summary>
1400         public class MemberList : IList {
1401                 public readonly IList List;
1402                 int count;
1403
1404                 /// <summary>
1405                 ///   Create a new MemberList from the given IList.
1406                 /// </summary>
1407                 public MemberList (IList list)
1408                 {
1409                         if (list != null)
1410                                 this.List = list;
1411                         else
1412                                 this.List = new ArrayList ();
1413                         count = List.Count;
1414                 }
1415
1416                 /// <summary>
1417                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1418                 /// </summary>
1419                 public MemberList (IList first, IList second)
1420                 {
1421                         ArrayList list = new ArrayList ();
1422                         list.AddRange (first);
1423                         list.AddRange (second);
1424                         count = list.Count;
1425                         List = list;
1426                 }
1427
1428                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1429
1430                 /// <summary>
1431                 ///   Cast the MemberList into a MemberInfo[] array.
1432                 /// </summary>
1433                 /// <remarks>
1434                 ///   This is an expensive operation, only use it if it's really necessary.
1435                 /// </remarks>
1436                 public static explicit operator MemberInfo [] (MemberList list)
1437                 {
1438                         Timer.StartTimer (TimerType.MiscTimer);
1439                         MemberInfo [] result = new MemberInfo [list.Count];
1440                         list.CopyTo (result, 0);
1441                         Timer.StopTimer (TimerType.MiscTimer);
1442                         return result;
1443                 }
1444
1445                 // ICollection
1446
1447                 public int Count {
1448                         get {
1449                                 return count;
1450                         }
1451                 }
1452
1453                 public bool IsSynchronized {
1454                         get {
1455                                 return List.IsSynchronized;
1456                         }
1457                 }
1458
1459                 public object SyncRoot {
1460                         get {
1461                                 return List.SyncRoot;
1462                         }
1463                 }
1464
1465                 public void CopyTo (Array array, int index)
1466                 {
1467                         List.CopyTo (array, index);
1468                 }
1469
1470                 // IEnumerable
1471
1472                 public IEnumerator GetEnumerator ()
1473                 {
1474                         return List.GetEnumerator ();
1475                 }
1476
1477                 // IList
1478
1479                 public bool IsFixedSize {
1480                         get {
1481                                 return true;
1482                         }
1483                 }
1484
1485                 public bool IsReadOnly {
1486                         get {
1487                                 return true;
1488                         }
1489                 }
1490
1491                 object IList.this [int index] {
1492                         get {
1493                                 return List [index];
1494                         }
1495
1496                         set {
1497                                 throw new NotSupportedException ();
1498                         }
1499                 }
1500
1501                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1502                 public MemberInfo this [int index] {
1503                         get {
1504                                 return (MemberInfo) List [index];
1505                         }
1506                 }
1507
1508                 public int Add (object value)
1509                 {
1510                         throw new NotSupportedException ();
1511                 }
1512
1513                 public void Clear ()
1514                 {
1515                         throw new NotSupportedException ();
1516                 }
1517
1518                 public bool Contains (object value)
1519                 {
1520                         return List.Contains (value);
1521                 }
1522
1523                 public int IndexOf (object value)
1524                 {
1525                         return List.IndexOf (value);
1526                 }
1527
1528                 public void Insert (int index, object value)
1529                 {
1530                         throw new NotSupportedException ();
1531                 }
1532
1533                 public void Remove (object value)
1534                 {
1535                         throw new NotSupportedException ();
1536                 }
1537
1538                 public void RemoveAt (int index)
1539                 {
1540                         throw new NotSupportedException ();
1541                 }
1542         }
1543
1544         /// <summary>
1545         ///   This interface is used to get all members of a class when creating the
1546         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1547         ///   want to support the member cache and by TypeHandle to get caching of
1548         ///   non-dynamic types.
1549         /// </summary>
1550         public interface IMemberContainer {
1551                 /// <summary>
1552                 ///   The name of the IMemberContainer.  This is only used for
1553                 ///   debugging purposes.
1554                 /// </summary>
1555                 string Name {
1556                         get;
1557                 }
1558
1559                 /// <summary>
1560                 ///   The type of this IMemberContainer.
1561                 /// </summary>
1562                 Type Type {
1563                         get;
1564                 }
1565
1566                 /// <summary>
1567                 ///   Returns the IMemberContainer of the base class or null if this
1568                 ///   is an interface or TypeManger.object_type.
1569                 ///   This is used when creating the member cache for a class to get all
1570                 ///   members from the base class.
1571                 /// </summary>
1572                 MemberCache BaseCache {
1573                         get;
1574                 }
1575
1576                 /// <summary>
1577                 ///   Whether this is an interface.
1578                 /// </summary>
1579                 bool IsInterface {
1580                         get;
1581                 }
1582
1583                 /// <summary>
1584                 ///   Returns all members of this class with the corresponding MemberTypes
1585                 ///   and BindingFlags.
1586                 /// </summary>
1587                 /// <remarks>
1588                 ///   When implementing this method, make sure not to return any inherited
1589                 ///   members and check the MemberTypes and BindingFlags properly.
1590                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1591                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1592                 ///   MemberInfo class, but the cache needs this information.  That's why
1593                 ///   this method is called multiple times with different BindingFlags.
1594                 /// </remarks>
1595                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1596
1597                 /// <summary>
1598                 ///   Return the container's member cache.
1599                 /// </summary>
1600                 MemberCache MemberCache {
1601                         get;
1602                 }
1603         }
1604
1605         /// <summary>
1606         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1607         ///   member lookups.  It has a member name based hash table; it maps each member
1608         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1609         ///   and the BindingFlags that were initially used to get it.  The cache contains
1610         ///   all members of the current class and all inherited members.  If this cache is
1611         ///   for an interface types, it also contains all inherited members.
1612         ///
1613         ///   There are two ways to get a MemberCache:
1614         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1615         ///     use the DeclSpace.MemberCache property.
1616         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1617         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1618         /// </summary>
1619         public class MemberCache {
1620                 public readonly IMemberContainer Container;
1621                 protected Hashtable member_hash;
1622                 protected Hashtable method_hash;
1623
1624                 /// <summary>
1625                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1626                 /// </summary>
1627                 public MemberCache (IMemberContainer container)
1628                 {
1629                         this.Container = container;
1630
1631                         Timer.IncrementCounter (CounterType.MemberCache);
1632                         Timer.StartTimer (TimerType.CacheInit);
1633
1634                         // If we have a base class (we have a base class unless we're
1635                         // TypeManager.object_type), we deep-copy its MemberCache here.
1636                         if (Container.BaseCache != null)
1637                                 member_hash = SetupCache (Container.BaseCache);
1638                         else
1639                                 member_hash = new Hashtable ();
1640
1641                         // If this is neither a dynamic type nor an interface, create a special
1642                         // method cache with all declared and inherited methods.
1643                         Type type = container.Type;
1644                         if (!(type is TypeBuilder) && !type.IsInterface &&
1645                             // !(type.IsGenericType && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
1646                             !TypeManager.IsGenericType (type) && !TypeManager.IsGenericParameter (type) &&
1647                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1648                                 method_hash = new Hashtable ();
1649                                 AddMethods (type);
1650                         }
1651
1652                         // Add all members from the current class.
1653                         AddMembers (Container);
1654
1655                         Timer.StopTimer (TimerType.CacheInit);
1656                 }
1657
1658                 public MemberCache (Type[] ifaces)
1659                 {
1660                         //
1661                         // The members of this cache all belong to other caches.
1662                         // So, 'Container' will not be used.
1663                         //
1664                         this.Container = null;
1665
1666                         member_hash = new Hashtable ();
1667                         if (ifaces == null)
1668                                 return;
1669
1670                         foreach (Type itype in ifaces)
1671                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1672                 }
1673
1674                 public MemberCache (IMemberContainer container, Type base_class, Type[] ifaces)
1675                 {
1676                         this.Container = container;
1677
1678                         // If we have a base class (we have a base class unless we're
1679                         // TypeManager.object_type), we deep-copy its MemberCache here.
1680                         if (Container.BaseCache != null)
1681                                 member_hash = SetupCache (Container.BaseCache);
1682                         else
1683                                 member_hash = new Hashtable ();
1684
1685                         if (base_class != null)
1686                                 AddCacheContents (TypeManager.LookupMemberCache (base_class));
1687                         if (ifaces != null) {
1688                                 foreach (Type itype in ifaces) {
1689                                         MemberCache cache = TypeManager.LookupMemberCache (itype);
1690                                         if (cache != null)
1691                                                 AddCacheContents (cache);
1692                                 }
1693                         }
1694                 }
1695
1696                 /// <summary>
1697                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1698                 /// </summary>
1699                 static Hashtable SetupCache (MemberCache base_class)
1700                 {
1701                         Hashtable hash = new Hashtable ();
1702
1703                         if (base_class == null)
1704                                 return hash;
1705
1706                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1707                         while (it.MoveNext ()) {
1708                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1709                          }
1710
1711                         return hash;
1712                 }
1713
1714                 /// <summary>
1715                 ///   Add the contents of `cache' to the member_hash.
1716                 /// </summary>
1717                 void AddCacheContents (MemberCache cache)
1718                 {
1719                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1720                         while (it.MoveNext ()) {
1721                                 ArrayList list = (ArrayList) member_hash [it.Key];
1722                                 if (list == null)
1723                                         member_hash [it.Key] = list = new ArrayList ();
1724
1725                                 ArrayList entries = (ArrayList) it.Value;
1726                                 for (int i = entries.Count-1; i >= 0; i--) {
1727                                         CacheEntry entry = (CacheEntry) entries [i];
1728
1729                                         if (entry.Container != cache.Container)
1730                                                 break;
1731                                         list.Add (entry);
1732                                 }
1733                         }
1734                 }
1735
1736                 /// <summary>
1737                 ///   Add all members from class `container' to the cache.
1738                 /// </summary>
1739                 void AddMembers (IMemberContainer container)
1740                 {
1741                         // We need to call AddMembers() with a single member type at a time
1742                         // to get the member type part of CacheEntry.EntryType right.
1743                         if (!container.IsInterface) {
1744                                 AddMembers (MemberTypes.Constructor, container);
1745                                 AddMembers (MemberTypes.Field, container);
1746                         }
1747                         AddMembers (MemberTypes.Method, container);
1748                         AddMembers (MemberTypes.Property, container);
1749                         AddMembers (MemberTypes.Event, container);
1750                         // Nested types are returned by both Static and Instance searches.
1751                         AddMembers (MemberTypes.NestedType,
1752                                     BindingFlags.Static | BindingFlags.Public, container);
1753                         AddMembers (MemberTypes.NestedType,
1754                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1755                 }
1756
1757                 void AddMembers (MemberTypes mt, IMemberContainer container)
1758                 {
1759                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1760                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1761                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1762                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1763                 }
1764
1765                 void AddMember (MemberTypes mt, BindingFlags bf, IMemberContainer container,
1766                                 string name, MemberInfo member)
1767                 {
1768                         // We use a name-based hash table of ArrayList's.
1769                         ArrayList list = (ArrayList) member_hash [name];
1770                         if (list == null) {
1771                                 list = new ArrayList ();
1772                                 member_hash.Add (name, list);
1773                         }
1774
1775                         // When this method is called for the current class, the list will
1776                         // already contain all inherited members from our base classes.
1777                         // We cannot add new members in front of the list since this'd be an
1778                         // expensive operation, that's why the list is sorted in reverse order
1779                         // (ie. members from the current class are coming last).
1780                         list.Add (new CacheEntry (container, member, mt, bf));
1781                 }
1782
1783                 /// <summary>
1784                 ///   Add all members from class `container' with the requested MemberTypes and
1785                 ///   BindingFlags to the cache.  This method is called multiple times with different
1786                 ///   MemberTypes and BindingFlags.
1787                 /// </summary>
1788                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1789                 {
1790                         MemberList members = container.GetMembers (mt, bf);
1791
1792                         foreach (MemberInfo member in members) {
1793                                 string name = member.Name;
1794
1795                                 AddMember (mt, bf, container, name, member);
1796
1797                                 if (member is MethodInfo) {
1798                                         string gname = TypeManager.GetMethodName ((MethodInfo) member);
1799                                         if (gname != name)
1800                                                 AddMember (mt, bf, container, gname, member);
1801                                 }
1802                         }
1803                 }
1804
1805                 /// <summary>
1806                 ///   Add all declared and inherited methods from class `type' to the method cache.
1807                 /// </summary>
1808                 void AddMethods (Type type)
1809                 {
1810                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1811                                     BindingFlags.FlattenHierarchy, type);
1812                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1813                                     BindingFlags.FlattenHierarchy, type);
1814                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1815                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1816                 }
1817
1818                 static ArrayList overrides = new ArrayList ();
1819
1820                 void AddMethods (BindingFlags bf, Type type)
1821                 {
1822                         MethodBase [] members = type.GetMethods (bf);
1823
1824                         Array.Reverse (members);
1825
1826                         foreach (MethodBase member in members) {
1827                                 string name = member.Name;
1828
1829                                 // We use a name-based hash table of ArrayList's.
1830                                 ArrayList list = (ArrayList) method_hash [name];
1831                                 if (list == null) {
1832                                         list = new ArrayList ();
1833                                         method_hash.Add (name, list);
1834                                 }
1835
1836                                 MethodInfo curr = (MethodInfo) member;
1837                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1838                                         MethodInfo base_method = curr.GetBaseDefinition ();
1839
1840                                         if (base_method == curr)
1841                                                 // Not every virtual function needs to have a NewSlot flag.
1842                                                 break;
1843
1844                                         overrides.Add (curr);
1845                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1846                                         curr = base_method;
1847                                 }
1848
1849                                 if (overrides.Count > 0) {
1850                                         for (int i = 0; i < overrides.Count; ++i)
1851                                                 TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
1852                                         overrides.Clear ();
1853                                 }
1854
1855                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1856                                 // sorted so we need to do this check for every member.
1857                                 BindingFlags new_bf = bf;
1858                                 if (member.DeclaringType == type)
1859                                         new_bf |= BindingFlags.DeclaredOnly;
1860
1861                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1862                         }
1863                 }
1864
1865                 /// <summary>
1866                 ///   Compute and return a appropriate `EntryType' magic number for the given
1867                 ///   MemberTypes and BindingFlags.
1868                 /// </summary>
1869                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1870                 {
1871                         EntryType type = EntryType.None;
1872
1873                         if ((mt & MemberTypes.Constructor) != 0)
1874                                 type |= EntryType.Constructor;
1875                         if ((mt & MemberTypes.Event) != 0)
1876                                 type |= EntryType.Event;
1877                         if ((mt & MemberTypes.Field) != 0)
1878                                 type |= EntryType.Field;
1879                         if ((mt & MemberTypes.Method) != 0)
1880                                 type |= EntryType.Method;
1881                         if ((mt & MemberTypes.Property) != 0)
1882                                 type |= EntryType.Property;
1883                         // Nested types are returned by static and instance searches.
1884                         if ((mt & MemberTypes.NestedType) != 0)
1885                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1886
1887                         if ((bf & BindingFlags.Instance) != 0)
1888                                 type |= EntryType.Instance;
1889                         if ((bf & BindingFlags.Static) != 0)
1890                                 type |= EntryType.Static;
1891                         if ((bf & BindingFlags.Public) != 0)
1892                                 type |= EntryType.Public;
1893                         if ((bf & BindingFlags.NonPublic) != 0)
1894                                 type |= EntryType.NonPublic;
1895                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1896                                 type |= EntryType.Declared;
1897
1898                         return type;
1899                 }
1900
1901                 /// <summary>
1902                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1903                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1904                 ///   single member types.
1905                 /// </summary>
1906                 public static bool IsSingleMemberType (MemberTypes mt)
1907                 {
1908                         switch (mt) {
1909                         case MemberTypes.Constructor:
1910                         case MemberTypes.Event:
1911                         case MemberTypes.Field:
1912                         case MemberTypes.Method:
1913                         case MemberTypes.Property:
1914                         case MemberTypes.NestedType:
1915                                 return true;
1916
1917                         default:
1918                                 return false;
1919                         }
1920                 }
1921
1922                 /// <summary>
1923                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1924                 ///   number to speed up the searching process.
1925                 /// </summary>
1926                 [Flags]
1927                 protected enum EntryType {
1928                         None            = 0x000,
1929
1930                         Instance        = 0x001,
1931                         Static          = 0x002,
1932                         MaskStatic      = Instance|Static,
1933
1934                         Public          = 0x004,
1935                         NonPublic       = 0x008,
1936                         MaskProtection  = Public|NonPublic,
1937
1938                         Declared        = 0x010,
1939
1940                         Constructor     = 0x020,
1941                         Event           = 0x040,
1942                         Field           = 0x080,
1943                         Method          = 0x100,
1944                         Property        = 0x200,
1945                         NestedType      = 0x400,
1946
1947                         NotExtensionMethod      = 0x800,
1948
1949                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1950                 }
1951
1952                 protected class CacheEntry {
1953                         public readonly IMemberContainer Container;
1954                         public EntryType EntryType;
1955                         public readonly MemberInfo Member;
1956
1957                         public CacheEntry (IMemberContainer container, MemberInfo member,
1958                                            MemberTypes mt, BindingFlags bf)
1959                         {
1960                                 this.Container = container;
1961                                 this.Member = member;
1962                                 this.EntryType = GetEntryType (mt, bf);
1963                         }
1964
1965                         public override string ToString ()
1966                         {
1967                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1968                                                       EntryType, Member);
1969                         }
1970                 }
1971
1972                 /// <summary>
1973                 ///   This is called each time we're walking up one level in the class hierarchy
1974                 ///   and checks whether we can abort the search since we've already found what
1975                 ///   we were looking for.
1976                 /// </summary>
1977                 protected bool DoneSearching (ArrayList list)
1978                 {
1979                         //
1980                         // We've found exactly one member in the current class and it's not
1981                         // a method or constructor.
1982                         //
1983                         if (list.Count == 1 && !(list [0] is MethodBase))
1984                                 return true;
1985
1986                         //
1987                         // Multiple properties: we query those just to find out the indexer
1988                         // name
1989                         //
1990                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1991                                 return true;
1992
1993                         return false;
1994                 }
1995
1996                 /// <summary>
1997                 ///   Looks up members with name `name'.  If you provide an optional
1998                 ///   filter function, it'll only be called with members matching the
1999                 ///   requested member name.
2000                 ///
2001                 ///   This method will try to use the cache to do the lookup if possible.
2002                 ///
2003                 ///   Unlike other FindMembers implementations, this method will always
2004                 ///   check all inherited members - even when called on an interface type.
2005                 ///
2006                 ///   If you know that you're only looking for methods, you should use
2007                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
2008                 ///   When doing a method-only search, it'll try to use a special method
2009                 ///   cache (unless it's a dynamic type or an interface) and the returned
2010                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
2011                 ///   The lookup process will automatically restart itself in method-only
2012                 ///   search mode if it discovers that it's about to return methods.
2013                 /// </summary>
2014                 ArrayList global = new ArrayList ();
2015                 bool using_global = false;
2016
2017                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
2018
2019                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
2020                                                   MemberFilter filter, object criteria)
2021                 {
2022                         if (using_global)
2023                                 throw new Exception ();
2024
2025                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
2026                         bool method_search = mt == MemberTypes.Method;
2027                         // If we have a method cache and we aren't already doing a method-only search,
2028                         // then we restart a method search if the first match is a method.
2029                         bool do_method_search = !method_search && (method_hash != null);
2030
2031                         ArrayList applicable;
2032
2033                         // If this is a method-only search, we try to use the method cache if
2034                         // possible; a lookup in the method cache will return a MemberInfo with
2035                         // the correct ReflectedType for inherited methods.
2036
2037                         if (method_search && (method_hash != null))
2038                                 applicable = (ArrayList) method_hash [name];
2039                         else
2040                                 applicable = (ArrayList) member_hash [name];
2041
2042                         if (applicable == null)
2043                                 return emptyMemberInfo;
2044
2045                         //
2046                         // 32  slots gives 53 rss/54 size
2047                         // 2/4 slots gives 55 rss
2048                         //
2049                         // Strange: from 25,000 calls, only 1,800
2050                         // are above 2.  Why does this impact it?
2051                         //
2052                         global.Clear ();
2053                         using_global = true;
2054
2055                         Timer.StartTimer (TimerType.CachedLookup);
2056
2057                         EntryType type = GetEntryType (mt, bf);
2058
2059                         IMemberContainer current = Container;
2060
2061                         bool do_interface_search = current.IsInterface;
2062
2063                         // `applicable' is a list of all members with the given member name `name'
2064                         // in the current class and all its base classes.  The list is sorted in
2065                         // reverse order due to the way how the cache is initialy created (to speed
2066                         // things up, we're doing a deep-copy of our base).
2067
2068                         for (int i = applicable.Count-1; i >= 0; i--) {
2069                                 CacheEntry entry = (CacheEntry) applicable [i];
2070
2071                                 // This happens each time we're walking one level up in the class
2072                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
2073                                 // the first time this happens (this may already happen in the first
2074                                 // iteration of this loop if there are no members with the name we're
2075                                 // looking for in the current class).
2076                                 if (entry.Container != current) {
2077                                         if (declared_only)
2078                                                 break;
2079
2080                                         if (!do_interface_search && DoneSearching (global))
2081                                                 break;
2082
2083                                         current = entry.Container;
2084                                 }
2085
2086                                 // Is the member of the correct type ?
2087                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2088                                         continue;
2089
2090                                 // Is the member static/non-static ?
2091                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2092                                         continue;
2093
2094                                 // Apply the filter to it.
2095                                 if (filter (entry.Member, criteria)) {
2096                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method) {
2097                                                 do_method_search = false;
2098                                         }
2099
2100                                         // Because interfaces support multiple inheritance we have to be sure that
2101                                         // base member is from same interface, so only top level member will be returned
2102                                         if (do_interface_search && global.Count > 0) {
2103                                                 bool member_already_exists = false;
2104
2105                                                 foreach (MemberInfo mi in global) {
2106                                                         if (mi is MethodBase)
2107                                                                 continue;
2108
2109                                                         if (IsInterfaceBaseInterface (TypeManager.GetInterfaces (mi.DeclaringType), entry.Member.DeclaringType)) {
2110                                                                 member_already_exists = true;
2111                                                                 break;
2112                                                         }
2113                                                 }
2114                                                 if (member_already_exists)
2115                                                         continue;
2116                                         }
2117
2118                                         global.Add (entry.Member);
2119                                 }
2120                         }
2121
2122                         Timer.StopTimer (TimerType.CachedLookup);
2123
2124                         // If we have a method cache and we aren't already doing a method-only
2125                         // search, we restart in method-only search mode if the first match is
2126                         // a method.  This ensures that we return a MemberInfo with the correct
2127                         // ReflectedType for inherited methods.
2128                         if (do_method_search && (global.Count > 0)){
2129                                 using_global = false;
2130
2131                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2132                         }
2133
2134                         using_global = false;
2135                         MemberInfo [] copy = new MemberInfo [global.Count];
2136                         global.CopyTo (copy);
2137                         return copy;
2138                 }
2139
2140                 /// <summary>
2141                 /// Returns true if iterface exists in any base interfaces (ifaces)
2142                 /// </summary>
2143                 static bool IsInterfaceBaseInterface (Type[] ifaces, Type ifaceToFind)
2144                 {
2145                         foreach (Type iface in ifaces) {
2146                                 if (iface == ifaceToFind)
2147                                         return true;
2148
2149                                 Type[] base_ifaces = TypeManager.GetInterfaces (iface);
2150                                 if (base_ifaces.Length > 0 && IsInterfaceBaseInterface (base_ifaces, ifaceToFind))
2151                                         return true;
2152                         }
2153                         return false;
2154                 }
2155
2156                 // find the nested type @name in @this.
2157                 public Type FindNestedType (string name)
2158                 {
2159                         ArrayList applicable = (ArrayList) member_hash [name];
2160                         if (applicable == null)
2161                                 return null;
2162
2163                         for (int i = applicable.Count-1; i >= 0; i--) {
2164                                 CacheEntry entry = (CacheEntry) applicable [i];
2165                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
2166                                         return (Type) entry.Member;
2167                         }
2168
2169                         return null;
2170                 }
2171
2172                 public MemberInfo FindBaseEvent (Type invocation_type, string name)
2173                 {
2174                         ArrayList applicable = (ArrayList) member_hash [name];
2175                         if (applicable == null)
2176                                 return null;
2177
2178                         //
2179                         // Walk the chain of events, starting from the top.
2180                         //
2181                         for (int i = applicable.Count - 1; i >= 0; i--)
2182                         {
2183                                 CacheEntry entry = (CacheEntry) applicable [i];
2184                                 if ((entry.EntryType & EntryType.Event) == 0)
2185                                         continue;
2186
2187                                 EventInfo ei = (EventInfo)entry.Member;
2188                                 return ei.GetAddMethod (true);
2189                         }
2190
2191                         return null;
2192                 }
2193
2194                 //
2195                 // Looks for extension methods with defined name and extension type
2196                 //
2197                 public ArrayList FindExtensionMethods (Type extensionType, string name, bool publicOnly)
2198                 {
2199                         ArrayList entries;
2200                         if (method_hash != null)
2201                                 entries = (ArrayList)method_hash [name];
2202                         else
2203                                 entries = (ArrayList)member_hash [name];
2204
2205                         if (entries == null)
2206                                 return null;
2207
2208                         EntryType entry_type = EntryType.Static | EntryType.Method | EntryType.NotExtensionMethod;
2209                         if (publicOnly) {
2210                                 entry_type |= EntryType.Public;
2211                         }
2212                         EntryType found_entry_type = entry_type & ~EntryType.NotExtensionMethod;
2213
2214                         ArrayList candidates = null;
2215                         foreach (CacheEntry entry in entries) {
2216                                 if ((entry.EntryType & entry_type) == found_entry_type) {
2217                                         MethodBase mb = (MethodBase)entry.Member;
2218
2219                                         IMethodData md = TypeManager.GetMethod (mb);
2220                                         ParameterData pd = md == null ?
2221                                                 TypeManager.GetParameterData (mb) : md.ParameterInfo;
2222
2223                                         Type ex_type = pd.ExtensionMethodType;
2224                                         if (ex_type == null) {
2225                                                 entry.EntryType |= EntryType.NotExtensionMethod;
2226                                                 continue;
2227                                         }
2228
2229                                         //if (implicit conversion between ex_type and extensionType exist) {
2230                                                 if (candidates == null)
2231                                                         candidates = new ArrayList (2);
2232                                                 candidates.Add (mb);
2233                                         //}
2234                                 }
2235                         }
2236
2237                         return candidates;
2238                 }
2239
2240                 //
2241                 // This finds the method or property for us to override. invocation_type is the type where
2242                 // the override is going to be declared, name is the name of the method/property, and
2243                 // param_types is the parameters, if any to the method or property
2244                 //
2245                 // Because the MemberCache holds members from this class and all the base classes,
2246                 // we can avoid tons of reflection stuff.
2247                 //
2248                 public MemberInfo FindMemberToOverride (Type invocation_type, string name, Type [] param_types, GenericMethod generic_method, bool is_property)
2249                 {
2250                         ArrayList applicable;
2251                         if (method_hash != null && !is_property)
2252                                 applicable = (ArrayList) method_hash [name];
2253                         else
2254                                 applicable = (ArrayList) member_hash [name];
2255
2256                         if (applicable == null)
2257                                 return null;
2258                         //
2259                         // Walk the chain of methods, starting from the top.
2260                         //
2261                         for (int i = applicable.Count - 1; i >= 0; i--) {
2262                                 CacheEntry entry = (CacheEntry) applicable [i];
2263
2264                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2265                                         continue;
2266
2267                                 PropertyInfo pi = null;
2268                                 MethodInfo mi = null;
2269                                 FieldInfo fi = null;
2270                                 Type [] cmp_attrs = null;
2271
2272                                 if (is_property) {
2273                                         if ((entry.EntryType & EntryType.Field) != 0) {
2274                                                 fi = (FieldInfo)entry.Member;
2275
2276                                                 // TODO: For this case we ignore member type
2277                                                 //fb = TypeManager.GetField (fi);
2278                                                 //cmp_attrs = new Type[] { fb.MemberType };
2279                                         } else {
2280                                                 pi = (PropertyInfo) entry.Member;
2281                                                 cmp_attrs = TypeManager.GetArgumentTypes (pi);
2282                                         }
2283                                 } else {
2284                                         mi = (MethodInfo) entry.Member;
2285                                         cmp_attrs = TypeManager.GetParameterData (mi).Types;
2286                                 }
2287
2288                                 if (fi != null) {
2289                                         // TODO: Almost duplicate !
2290                                         // Check visibility
2291                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2292                                         case FieldAttributes.PrivateScope:
2293                                                 continue;
2294                                         case FieldAttributes.Private:
2295                                                 //
2296                                                 // A private method is Ok if we are a nested subtype.
2297                                                 // The spec actually is not very clear about this, see bug 52458.
2298                                                 //
2299                                                 if (!invocation_type.Equals (entry.Container.Type) &&
2300                                                     !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
2301                                                         continue;
2302                                                 break;
2303                                         case FieldAttributes.FamANDAssem:
2304                                         case FieldAttributes.Assembly:
2305                                                 //
2306                                                 // Check for assembly methods
2307                                                 //
2308                                                 if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2309                                                         continue;
2310                                                 break;
2311                                         }
2312                                         return entry.Member;
2313                                 }
2314
2315                                 //
2316                                 // Check the arguments
2317                                 //
2318                                 if (cmp_attrs.Length != param_types.Length)
2319                                         continue;
2320
2321                                 int j;
2322                                 for (j = 0; j < cmp_attrs.Length; ++j)
2323                                         if (!TypeManager.IsEqual (param_types [j], cmp_attrs [j]))
2324                                                 break;
2325                                 if (j < cmp_attrs.Length)
2326                                         continue;
2327
2328                                 //
2329                                 // check generic arguments for methods
2330                                 //
2331                                 if (mi != null) {
2332                                         Type [] cmpGenArgs = TypeManager.GetGenericArguments (mi);
2333                                         if (generic_method == null && cmpGenArgs.Length != 0)
2334                                                 continue;
2335                                         if (generic_method != null && cmpGenArgs.Length != generic_method.TypeParameters.Length)
2336                                                 continue;
2337                                 }
2338
2339                                 //
2340                                 // get one of the methods because this has the visibility info.
2341                                 //
2342                                 if (is_property) {
2343                                         mi = pi.GetGetMethod (true);
2344                                         if (mi == null)
2345                                                 mi = pi.GetSetMethod (true);
2346                                 }
2347
2348                                 //
2349                                 // Check visibility
2350                                 //
2351                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2352                                 case MethodAttributes.PrivateScope:
2353                                         continue;
2354                                 case MethodAttributes.Private:
2355                                         //
2356                                         // A private method is Ok if we are a nested subtype.
2357                                         // The spec actually is not very clear about this, see bug 52458.
2358                                         //
2359                                         if (!invocation_type.Equals (entry.Container.Type) &&
2360                                             !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
2361                                                 continue;
2362                                         break;
2363                                 case MethodAttributes.FamANDAssem:
2364                                 case MethodAttributes.Assembly:
2365                                         //
2366                                         // Check for assembly methods
2367                                         //
2368                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2369                                                 continue;
2370                                         break;
2371                                 }
2372                                 return entry.Member;
2373                         }
2374
2375                         return null;
2376                 }
2377
2378                 /// <summary>
2379                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2380                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2381                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2382                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2383                 /// </summary>
2384                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2385                 {
2386                         ArrayList applicable = null;
2387
2388                         if (method_hash != null)
2389                                 applicable = (ArrayList) method_hash [name];
2390
2391                         if (applicable != null) {
2392                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2393                                         CacheEntry entry = (CacheEntry) applicable [i];
2394                                         if ((entry.EntryType & EntryType.Public) != 0)
2395                                                 return entry.Member;
2396                                 }
2397                         }
2398
2399                         if (member_hash == null)
2400                                 return null;
2401                         applicable = (ArrayList) member_hash [name];
2402
2403                         if (applicable != null) {
2404                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2405                                         CacheEntry entry = (CacheEntry) applicable [i];
2406                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2407                                                 if (ignore_complex_types) {
2408                                                         if ((entry.EntryType & EntryType.Method) != 0)
2409                                                                 continue;
2410
2411                                                         // Does exist easier way how to detect indexer ?
2412                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2413                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
2414                                                                 if (arg_types.Length > 0)
2415                                                                         continue;
2416                                                         }
2417                                                 }
2418                                                 return entry.Member;
2419                                         }
2420                                 }
2421                         }
2422                         return null;
2423                 }
2424
2425                 Hashtable locase_table;
2426
2427                 /// <summary>
2428                 /// Builds low-case table for CLS Compliance test
2429                 /// </summary>
2430                 public Hashtable GetPublicMembers ()
2431                 {
2432                         if (locase_table != null)
2433                                 return locase_table;
2434
2435                         locase_table = new Hashtable ();
2436                         foreach (DictionaryEntry entry in member_hash) {
2437                                 ArrayList members = (ArrayList)entry.Value;
2438                                 for (int ii = 0; ii < members.Count; ++ii) {
2439                                         CacheEntry member_entry = (CacheEntry) members [ii];
2440
2441                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2442                                                 continue;
2443
2444                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2445                                         switch (member_entry.EntryType & EntryType.MaskType) {
2446                                                 case EntryType.Constructor:
2447                                                         continue;
2448
2449                                                 case EntryType.Field:
2450                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2451                                                                 continue;
2452                                                         break;
2453
2454                                                 case EntryType.Method:
2455                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2456                                                                 continue;
2457                                                         break;
2458
2459                                                 case EntryType.Property:
2460                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
2461                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2462                                                                 continue;
2463                                                         break;
2464
2465                                                 case EntryType.Event:
2466                                                         EventInfo ei = (EventInfo)member_entry.Member;
2467                                                         MethodInfo mi = ei.GetAddMethod ();
2468                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2469                                                                 continue;
2470                                                         break;
2471                                         }
2472                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2473                                         locase_table [lcase] = member_entry.Member;
2474                                         break;
2475                                 }
2476                         }
2477                         return locase_table;
2478                 }
2479
2480                 public Hashtable Members {
2481                         get {
2482                                 return member_hash;
2483                         }
2484                 }
2485
2486                 /// <summary>
2487                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2488                 /// </summary>
2489                 ///
2490                 // TODO: refactor as method is always 'this'
2491                 public static void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2492                 {
2493                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2494
2495                         for (int i = 0; i < al.Count; ++i) {
2496                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2497
2498                                 // skip itself
2499                                 if (entry.Member == this_builder)
2500                                         continue;
2501
2502                                 if ((entry.EntryType & tested_type) != tested_type)
2503                                         continue;
2504
2505                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2506                                 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
2507                                         method.ParameterTypes, TypeManager.GetParameterData (method_to_compare).Types);
2508
2509                                 if (result == AttributeTester.Result.Ok)
2510                                         continue;
2511
2512                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2513
2514                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2515                                 // However it is exactly what csc does.
2516                                 if (md != null && !md.IsClsComplianceRequired ())
2517                                         continue;
2518
2519                                 Report.SymbolRelatedToPreviousError (entry.Member);
2520                                 switch (result) {
2521                                         case AttributeTester.Result.RefOutArrayError:
2522                                                 Report.Error (3006, method.Location, "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2523                                                 continue;
2524                                         case AttributeTester.Result.ArrayArrayError:
2525                                                 Report.Error (3007, method.Location, "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant", method.GetSignatureForError ());
2526                                                 continue;
2527                                 }
2528
2529                                 throw new NotImplementedException (result.ToString ());
2530                         }
2531                 }
2532         }
2533 }