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                         if (args != null && args.Count > 0)
  55                                 this.TypeArguments = args;
  56                 }
  57
  58                 public MemberName (string name)
  59                         : this (name, Location.Null)
  60                 { }
  61
  62                 public MemberName (string name, Location loc)
  63                         : this (null, name, false, loc)
  64                 { }
  65
  66                 public MemberName (string name, TypeArguments args, Location loc)
  67                         : this (null, name, false, args, loc)
  68                 { }
  69
  70                 public MemberName (MemberName left, string name)
  71                         : this (left, name, left != null ? left.Location : Location.Null)
  72                 { }
  73
  74                 public MemberName (MemberName left, string name, Location loc)
  75                         : this (left, name, false, loc)
  76                 { }
  77
  78                 public MemberName (MemberName left, string name, TypeArguments args, Location loc)
  79                         : this (left, name, false, args, loc)
  80                 { }
  81
  82                 public MemberName (string alias, string name, Location loc)
  83                         : this (new MemberName (alias, loc), name, true, loc)
  84                 { }
  85
  86                 public MemberName (MemberName left, MemberName right)
  87                         : this (left, right, right.Location)
  88                 { }
  89
  90                 public MemberName (MemberName left, MemberName right, Location loc)
  91                         : this (null, right.Name, false, right.TypeArguments, loc)
  92                 {
  93                         if (right.is_double_colon)
  94                                 throw new InternalErrorException ("Cannot append double_colon member name");
  95                         this.Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  96                 }
  97
  98                 public string GetName ()
  99                 {
 100                         return GetName (false);
 101                 }
 102
 103                 public bool IsGeneric {
 104                         get {
 105                                 if (TypeArguments != null)
 106                                         return true;
 107                                 else if (Left != null)
 108                                         return Left.IsGeneric;
 109                                 else
 110                                         return false;
 111                         }
 112                 }
 113
 114                 public string GetName (bool is_generic)
 115                 {
 116                         string name = is_generic ? Basename : Name;
 117                         string connect = is_double_colon ? "::" : ".";
 118                         if (Left != null)
 119                                 return Left.GetName (is_generic) + connect + name;
 120                         else
 121                                 return name;
 122                 }
 123
 124                 public string GetTypeName ()
 125                 {
 126                         string connect = is_double_colon ? "::" : ".";
 127                         if (Left != null)
 128                                 return Left.GetTypeName () + connect + MakeName (Name, TypeArguments);
 129                         else
 130                                 return MakeName (Name, TypeArguments);
 131                 }
 132
 133                 public Expression GetTypeExpression ()
 134                 {
 135                         if (Left == null) {
 136                                 if (TypeArguments != null)
 137                                         return new SimpleName (Basename, TypeArguments, Location);
 138
 139                                 if (RootContext.Version == LanguageVersion.LINQ && Name == "var")
 140                                         return new VarExpr (Name, Location);
 141
 142                                 return new SimpleName (Name, Location);
 143                         }
 144
 145                         if (is_double_colon) {
 146                                 if (Left.Left != null)
 147                                         throw new InternalErrorException ("The left side of a :: should be an identifier");
 148                                 return new QualifiedAliasMember (Left.Name, Name, Location);
 149                         }
 150
 151                         Expression lexpr = Left.GetTypeExpression ();
 152                         return new MemberAccess (lexpr, Name, TypeArguments, Location);
 153                 }
 154
 155                 public MemberName Clone ()
 156                 {
 157                         MemberName left_clone = Left == null ? null : Left.Clone ();
 158                         return new MemberName (left_clone, Name, is_double_colon, TypeArguments, Location);
 159                 }
 160
 161                 public string Basename {
 162                         get {
 163                                 if (TypeArguments != null)
 164                                         return MakeName (Name, TypeArguments);
 165                                 else
 166                                         return Name;
 167                         }
 168                 }
 169
 170                 public string FullName {
 171                         get {
 172                                 if (TypeArguments != null)
 173                                         return Name + "<" + TypeArguments + ">";
 174                                 else
 175                                         return Name;
 176                         }
 177                 }
 178
 179                 public string MethodName {
 180                         get {
 181                                 string connect = is_double_colon ? "::" : ".";
 182                                 if (Left != null)
 183                                         return Left.FullName + connect + Name;
 184                                 else
 185                                         return Name;
 186                         }
 187                 }
 188
 189                 public override string ToString ()
 190                 {
 191                         string connect = is_double_colon ? "::" : ".";
 192                         if (Left != null)
 193                                 return Left.FullName + connect + FullName;
 194                         else
 195                                 return FullName;
 196                 }
 197
 198                 public override bool Equals (object other)
 199                 {
 200                         return Equals (other as MemberName);
 201                 }
 202
 203                 public bool Equals (MemberName other)
 204                 {
 205                         if (this == other)
 206                                 return true;
 207                         if (other == null || Name != other.Name)
 208                                 return false;
 209                         if (is_double_colon != other.is_double_colon)
 210                                 return false;
 211
 212                         if ((TypeArguments != null) &&
 213                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 214                                 return false;
 215
 216                         if ((TypeArguments == null) && (other.TypeArguments != null))
 217                                 return false;
 218
 219                         if (Left == null)
 220                                 return other.Left == null;
 221
 222                         return Left.Equals (other.Left);
 223                 }
 224
 225                 public override int GetHashCode ()
 226                 {
 227                         int hash = Name.GetHashCode ();
 228                         for (MemberName n = Left; n != null; n = n.Left)
 229                                 hash ^= n.Name.GetHashCode ();
 230                         if (is_double_colon)
 231                                 hash ^= 0xbadc01d;
 232
 233                         if (TypeArguments != null)
 234                                 hash ^= TypeArguments.Count << 5;
 235
 236                         return hash & 0x7FFFFFFF;
 237                 }
 238
 239                 public int CountTypeArguments {
 240                         get {
 241                                 if (TypeArguments != null)
 242                                         return TypeArguments.Count;
 243                                 else if (Left != null)
 244                                         return Left.CountTypeArguments;
 245                                 else
 246                                         return 0;
 247                         }
 248                 }
 249
 250                 public static string MakeName (string name, TypeArguments args)
 251                 {
 252                         if (args == null)
 253                                 return name;
 254                         else
 255                                 return name + "`" + args.Count;
 256                 }
 257
 258                 public static string MakeName (string name, int count)
 259                 {
 260                         return name + "`" + count;
 261                 }
 262         }
 263
 264         /// <summary>
 265         ///   Base representation for members.  This is used to keep track
 266         ///   of Name, Location and Modifier flags, and handling Attributes.
 267         /// </summary>
 268         public abstract class MemberCore : Attributable, IResolveContext {
 269                 /// <summary>
 270                 ///   Public name
 271                 /// </summary>
 272
 273                 protected string cached_name;
 274                 public string Name {
 275                         get {
 276                                 if (cached_name == null)
 277                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 278                                 return cached_name;
 279                         }
 280                 }
 281
 282                 // Is not readonly because of IndexerName attribute
 283                 private MemberName member_name;
 284                 public MemberName MemberName {
 285                         get { return member_name; }
 286                 }
 287
 288                 /// <summary>
 289                 ///   Modifier flags that the user specified in the source code
 290                 /// </summary>
 291                 private int mod_flags;
 292                 public int ModFlags {
 293                         set {
 294                                 mod_flags = value;
 295                                 if ((value & Modifiers.COMPILER_GENERATED) != 0)
 296                                         caching_flags = Flags.IsUsed | Flags.IsAssigned;
 297                         }
 298                         get {
 299                                 return mod_flags;
 300                         }
 301                 }
 302
 303                 public /*readonly*/ DeclSpace Parent;
 304
 305                 /// <summary>
 306                 ///   Location where this declaration happens
 307                 /// </summary>
 308                 public Location Location {
 309                         get { return member_name.Location; }
 310                 }
 311
 312                 /// <summary>
 313                 ///   XML documentation comment
 314                 /// </summary>
 315                 protected string comment;
 316
 317                 /// <summary>
 318                 ///   Represents header string for documentation comment
 319                 ///   for each member types.
 320                 /// </summary>
 321                 public abstract string DocCommentHeader { get; }
 322
 323                 [Flags]
 324                 public enum Flags {
 325                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 326                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 327                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 328                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 329                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 330                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 331                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 332                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 333                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 334                         Excluded = 1 << 9,                                      // Method is conditional
 335                         TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
 336                         IsUsed = 1 << 11,
 337                         IsAssigned = 1 << 12,                           // Field is assigned
 338                         HasExplicitLayout       = 1 << 13
 339                 }
 340
 341                 /// <summary>
 342                 ///   MemberCore flags at first detected then cached
 343                 /// </summary>
 344                 internal Flags caching_flags;
 345
 346                 public MemberCore (DeclSpace parent, MemberName name, Attributes attrs)
 347                         : base (attrs)
 348                 {
 349                         this.Parent = parent;
 350                         member_name = name;
 351                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 352                 }
 353
 354                 protected virtual void SetMemberName (MemberName new_name)
 355                 {
 356                         member_name = new_name;
 357                         cached_name = null;
 358                 }
 359
 360                 protected bool CheckAbstractAndExtern (bool has_block)
 361                 {
 362                         if (Parent.PartialContainer.Kind == Kind.Interface)
 363                                 return true;
 364
 365                         if (has_block) {
 366                                 if ((ModFlags & Modifiers.EXTERN) != 0) {
 367                                         Report.Error (179, Location, "`{0}' cannot declare a body because it is marked extern",
 368                                                 GetSignatureForError ());
 369                                         return false;
 370                                 }
 371
 372                                 if ((ModFlags & Modifiers.ABSTRACT) != 0) {
 373                                         Report.Error (500, Location, "`{0}' cannot declare a body because it is marked abstract",
 374                                                 GetSignatureForError ());
 375                                         return false;
 376                                 }
 377                         } else {
 378                                 if ((ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN)) == 0) {
 379                                         if (RootContext.Version >= LanguageVersion.LINQ && this is Property.PropertyMethod) {
 380                                                 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",
 381                                                               GetSignatureForError ());
 382                                         } else {
 383                                                 Report.Error (501, Location, "`{0}' must have a body because it is not marked abstract or extern",
 384                                                               GetSignatureForError ());
 385                                         }
 386                                         return false;
 387                                 }
 388                         }
 389
 390                         return true;
 391                 }
 392
 393                 public abstract bool Define ();
 394
 395                 public virtual string DocComment {
 396                         get {
 397                                 return comment;
 398                         }
 399                         set {
 400                                 comment = value;
 401                         }
 402                 }
 403
 404                 //
 405                 // Returns full member name for error message
 406                 //
 407                 public virtual string GetSignatureForError ()
 408                 {
 409                         if (Parent == null || Parent.Parent == null)
 410                                 return member_name.ToString ();
 411
 412                         return String.Concat (Parent.GetSignatureForError (), '.', member_name.ToString ());
 413                 }
 414
 415                 /// <summary>
 416                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 417                 /// </summary>
 418                 public virtual void Emit ()
 419                 {
 420                         if (!RootContext.VerifyClsCompliance)
 421                                 return;
 422
 423                         VerifyClsCompliance ();
 424                 }
 425
 426                 public virtual bool IsUsed {
 427                         get { return (caching_flags & Flags.IsUsed) != 0; }
 428                 }
 429
 430                 public void SetMemberIsUsed ()
 431                 {
 432                         caching_flags |= Flags.IsUsed;
 433                 }
 434
 435                 /// <summary>
 436                 /// Returns instance of ObsoleteAttribute for this MemberCore
 437                 /// </summary>
 438                 public virtual ObsoleteAttribute GetObsoleteAttribute ()
 439                 {
 440                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 441                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 442                                 return null;
 443                         }
 444
 445                         caching_flags &= ~Flags.Obsolete_Undetected;
 446
 447                         if (OptAttributes == null)
 448                                 return null;
 449
 450                         Attribute obsolete_attr = OptAttributes.Search (
 451                                 TypeManager.obsolete_attribute_type);
 452                         if (obsolete_attr == null)
 453                                 return null;
 454
 455                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute ();
 456                         if (obsolete == null)
 457                                 return null;
 458
 459                         caching_flags |= Flags.Obsolete;
 460                         return obsolete;
 461                 }
 462
 463                 /// <summary>
 464                 /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
 465                 /// </summary>
 466                 public virtual void CheckObsoleteness (Location loc)
 467                 {
 468                         if (Parent != null)
 469                                 Parent.CheckObsoleteness (loc);
 470
 471                         ObsoleteAttribute oa = GetObsoleteAttribute ();
 472                         if (oa == null) {
 473                                 return;
 474                         }
 475
 476                         AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc);
 477                 }
 478
 479                 /// <summary>
 480                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 481                 /// </summary>
 482                 public override bool IsClsComplianceRequired ()
 483                 {
 484                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 485                                 return (caching_flags & Flags.ClsCompliant) != 0;
 486
 487                         if (GetClsCompliantAttributeValue () && IsExposedFromAssembly ()) {
 488                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 489                                 caching_flags |= Flags.ClsCompliant;
 490                                 return true;
 491                         }
 492
 493                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 494                         return false;
 495                 }
 496
 497                 /// <summary>
 498                 /// Returns true when MemberCore is exposed from assembly.
 499                 /// </summary>
 500                 public bool IsExposedFromAssembly ()
 501                 {
 502                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 503                                 return false;
 504
 505                         DeclSpace parentContainer = Parent;
 506                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 507                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 508                                         return false;
 509                                 parentContainer = parentContainer.Parent;
 510                         }
 511                         return true;
 512                 }
 513
 514                 /// <summary>
 515                 /// Goes through class hierarchy and gets value of first found CLSCompliantAttribute.
 516                 /// If no is attribute exists then assembly CLSCompliantAttribute is returned.
 517                 /// </summary>
 518                 public virtual bool GetClsCompliantAttributeValue ()
 519                 {
 520                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
 521                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
 522
 523                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
 524
 525                         if (OptAttributes != null) {
 526                                 Attribute cls_attribute = OptAttributes.Search (
 527                                         TypeManager.cls_compliant_attribute_type);
 528                                 if (cls_attribute != null) {
 529                                         caching_flags |= Flags.HasClsCompliantAttribute;
 530                                         bool value = cls_attribute.GetClsCompliantAttributeValue ();
 531                                         if (value)
 532                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 533                                         return value;
 534                                 }
 535                         }
 536
 537                         // It's null for TypeParameter
 538                         if (Parent == null)
 539                                 return false;
 540
 541                         if (Parent.GetClsCompliantAttributeValue ()) {
 542                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 543                                 return true;
 544                         }
 545                         return false;
 546                 }
 547
 548                 /// <summary>
 549                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 550                 /// </summary>
 551                 protected bool HasClsCompliantAttribute {
 552                         get {
 553                                 if ((caching_flags & Flags.HasCompliantAttribute_Undetected) != 0)
 554                                         GetClsCompliantAttributeValue ();
 555
 556                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 557                         }
 558                 }
 559
 560                 /// <summary>
 561                 /// It helps to handle error 102 & 111 detection
 562                 /// </summary>
 563                 public virtual bool MarkForDuplicationCheck ()
 564                 {
 565                         return false;
 566                 }
 567
 568                 /// <summary>
 569                 /// The main virtual method for CLS-Compliant verifications.
 570                 /// The method returns true if member is CLS-Compliant and false if member is not
 571                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 572                 /// and add their extra verifications.
 573                 /// </summary>
 574                 protected virtual bool VerifyClsCompliance ()
 575                 {
 576                         if (!IsClsComplianceRequired ()) {
 577                                 if (HasClsCompliantAttribute && Report.WarningLevel >= 2) {
 578                                         if (!IsExposedFromAssembly ())
 579                                                 Report.Warning (3019, 2, Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
 580                                         if (!CodeGen.Assembly.IsClsCompliant)
 581                                                 Report.Warning (3021, 2, Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
 582                                 }
 583                                 return false;
 584                         }
 585
 586                         if (HasClsCompliantAttribute) {
 587                                 if (CodeGen.Assembly.ClsCompliantAttribute == null && !CodeGen.Assembly.IsClsCompliant) {
 588                                         Report.Error (3014, Location,
 589                                                 "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 590                                                 GetSignatureForError ());
 591                                         return false;
 592                                 }
 593
 594                                 if (!Parent.IsClsComplianceRequired ()) {
 595                                         Report.Warning (3018, 1, Location, "`{0}' cannot be marked as CLS-compliant because it is a member of non CLS-compliant type `{1}'",
 596                                                 GetSignatureForError (), Parent.GetSignatureForError ());
 597                                         return false;
 598                                 }
 599                         }
 600
 601                         if (member_name.Name [0] == '_') {
 602                                 Report.Error (3008, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 603                         }
 604                         return true;
 605                 }
 606
 607                 //
 608                 // Raised (and passed an XmlElement that contains the comment)
 609                 // when GenerateDocComment is writing documentation expectedly.
 610                 //
 611                 internal virtual void OnGenerateDocComment (XmlElement intermediateNode)
 612                 {
 613                 }
 614
 615                 //
 616                 // Returns a string that represents the signature for this
 617                 // member which should be used in XML documentation.
 618                 //
 619                 public virtual string GetDocCommentName (DeclSpace ds)
 620                 {
 621                         if (ds == null || this is DeclSpace)
 622                                 return DocCommentHeader + Name;
 623                         else
 624                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 625                 }
 626
 627                 //
 628                 // Generates xml doc comments (if any), and if required,
 629                 // handle warning report.
 630                 //
 631                 internal virtual void GenerateDocComment (DeclSpace ds)
 632                 {
 633                         DocUtil.GenerateDocComment (this, ds);
 634                 }
 635
 636                 public override IResolveContext ResolveContext {
 637                         get { return this; }
 638                 }
 639
 640                 #region IResolveContext Members
 641
 642                 public DeclSpace DeclContainer {
 643                         get { return Parent; }
 644                 }
 645
 646                 public virtual DeclSpace GenericDeclContainer {
 647                         get { return DeclContainer; }
 648                 }
 649
 650                 public bool IsInObsoleteScope {
 651                         get {
 652                                 if (GetObsoleteAttribute () != null)
 653                                         return true;
 654
 655                                 return Parent == null ? false : Parent.IsInObsoleteScope;
 656                         }
 657                 }
 658
 659                 public bool IsInUnsafeScope {
 660                         get {
 661                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 662                                         return true;
 663
 664                                 return Parent == null ? false : Parent.IsInUnsafeScope;
 665                         }
 666                 }
 667
 668                 #endregion
 669         }
 670
 671         /// <summary>
 672         ///   Base class for structs, classes, enumerations and interfaces.
 673         /// </summary>
 674         /// <remarks>
 675         ///   They all create new declaration spaces.  This
 676         ///   provides the common foundation for managing those name
 677         ///   spaces.
 678         /// </remarks>
 679         public abstract class DeclSpace : MemberCore {
 680                 /// <summary>
 681                 ///   This points to the actual definition that is being
 682                 ///   created with System.Reflection.Emit
 683                 /// </summary>
 684                 public TypeBuilder TypeBuilder;
 685
 686                 /// <summary>
 687                 ///   If we are a generic type, this is the type we are
 688                 ///   currently defining.  We need to lookup members on this
 689                 ///   instead of the TypeBuilder.
 690                 /// </summary>
 691                 public Type CurrentType;
 692
 693                 //
 694                 // This is the namespace in which this typecontainer
 695                 // was declared.  We use this to resolve names.
 696                 //
 697                 public NamespaceEntry NamespaceEntry;
 698
 699                 private Hashtable Cache = new Hashtable ();
 700
 701                 public readonly string Basename;
 702
 703                 protected Hashtable defined_names;
 704
 705                 public TypeContainer PartialContainer;
 706
 707                 readonly bool is_generic;
 708                 readonly int count_type_params;
 709                 readonly int count_current_type_params;
 710
 711                 //
 712                 // Whether we are Generic
 713                 //
 714                 public bool IsGeneric {
 715                         get {
 716                                 if (is_generic)
 717                                         return true;
 718                                 else if (Parent != null)
 719                                         return Parent.IsGeneric;
 720                                 else
 721                                         return false;
 722                         }
 723                 }
 724
 725                 static string[] attribute_targets = new string [] { "type" };
 726
 727                 public DeclSpace (NamespaceEntry ns, DeclSpace parent, MemberName name,
 728                                   Attributes attrs)
 729                         : base (parent, name, attrs)
 730                 {
 731                         NamespaceEntry = ns;
 732                         Basename = name.Basename;
 733                         defined_names = new Hashtable ();
 734                         PartialContainer = null;
 735                         if (name.TypeArguments != null) {
 736                                 is_generic = true;
 737                                 count_type_params = count_current_type_params = name.TypeArguments.Count;
 738                         }
 739                         if (parent != null)
 740                                 count_type_params += parent.count_type_params;
 741                 }
 742
 743                 public override DeclSpace GenericDeclContainer {
 744                         get { return this; }
 745                 }
 746
 747                 /// <summary>
 748                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 749                 /// </summary>
 750                 protected virtual bool AddToContainer (MemberCore symbol, string name)
 751                 {
 752                         MemberCore mc = (MemberCore) defined_names [name];
 753
 754                         if (mc == null) {
 755                                 defined_names.Add (name, symbol);
 756                                 return true;
 757                         }
 758
 759                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 760                                 return true;
 761
 762                         Report.SymbolRelatedToPreviousError (mc);
 763                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
 764                                 Error_MissingPartialModifier (symbol);
 765                                 return false;
 766                         }
 767
 768                         if (this is RootTypes) {
 769                                 Report.Error (101, symbol.Location,
 770                                         "The namespace `{0}' already contains a definition for `{1}'",
 771                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
 772                         } else if (symbol is TypeParameter) {
 773                                 Report.Error (692, symbol.Location,
 774                                               "Duplicate type parameter `{0}'", name);
 775                         } else {
 776                                 Report.Error (102, symbol.Location,
 777                                               "The type `{0}' already contains a definition for `{1}'",
 778                                               GetSignatureForError (), symbol.MemberName.Name);
 779                         }
 780
 781                         return false;
 782                 }
 783
 784                 /// <summary>
 785                 ///   Returns the MemberCore associated with a given name in the declaration
 786                 ///   space. It doesn't return method based symbols !!
 787                 /// </summary>
 788                 ///
 789                 public MemberCore GetDefinition (string name)
 790                 {
 791                         return (MemberCore)defined_names [name];
 792                 }
 793
 794                 public bool IsStaticClass {
 795                         get { return (ModFlags & Modifiers.STATIC) != 0; }
 796                 }
 797
 798                 //
 799                 // root_types contains all the types.  All TopLevel types
 800                 // hence have a parent that points to `root_types', that is
 801                 // why there is a non-obvious test down here.
 802                 //
 803                 public bool IsTopLevel {
 804                         get { return (Parent != null && Parent.Parent == null); }
 805                 }
 806
 807                 public virtual void CloseType ()
 808                 {
 809                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 810                                 try {
 811                                         TypeBuilder.CreateType ();
 812                                 } catch {
 813                                         //
 814                                         // The try/catch is needed because
 815                                         // nested enumerations fail to load when they
 816                                         // are defined.
 817                                         //
 818                                         // Even if this is the right order (enumerations
 819                                         // declared after types).
 820                                         //
 821                                         // Note that this still creates the type and
 822                                         // it is possible to save it
 823                                 }
 824                                 caching_flags |= Flags.CloseTypeCreated;
 825                         }
 826                 }
 827
 828                 protected virtual TypeAttributes TypeAttr {
 829                         get { return CodeGen.Module.DefaultCharSetType; }
 830                 }
 831
 832                 /// <remarks>
 833                 ///  Should be overriten by the appropriate declaration space
 834                 /// </remarks>
 835                 public abstract TypeBuilder DefineType ();
 836
 837                 /// <summary>
 838                 ///   Define all members, but don't apply any attributes or do anything which may
 839                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 840                 /// </summary>
 841                 public virtual bool DefineMembers ()
 842                 {
 843                         if (((ModFlags & Modifiers.NEW) != 0) && IsTopLevel) {
 844                                 Report.Error (1530, Location, "Keyword `new' is not allowed on namespace elements");
 845                                 return false;
 846                         }
 847                         return true;
 848                 }
 849
 850                 protected void Error_MissingPartialModifier (MemberCore type)
 851                 {
 852                         Report.Error (260, type.Location,
 853                                 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
 854                                 type.GetSignatureForError ());
 855                 }
 856
 857                 public override string GetSignatureForError ()
 858                 {
 859                         if (IsGeneric) {
 860                                 return SimpleName.RemoveGenericArity (Name) + TypeParameter.GetSignatureForError (CurrentTypeParameters);
 861                         }
 862                         // Parent.GetSignatureForError
 863                         return Name;
 864                 }
 865
 866                 public bool CheckAccessLevel (Type check_type)
 867                 {
 868                         TypeBuilder tb;
 869                         if (this is GenericMethod)
 870                                 tb = Parent.TypeBuilder;
 871                         else
 872                                 tb = TypeBuilder;
 873
 874                         check_type = TypeManager.DropGenericTypeArguments (check_type);
 875                         if (check_type == tb)
 876                                 return true;
 877
 878                         if (TypeBuilder == null)
 879                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 880                                 //        However, this is invoked again later -- so safe to return true.
 881                                 //        May also be null when resolving top-level attributes.
 882                                 return true;
 883
 884                         //
 885                         // Broken Microsoft runtime, return public for arrays, no matter what
 886                         // the accessibility is for their underlying class, and they return
 887                         // NonPublic visibility for pointers
 888                         //
 889                         if (check_type.IsArray || check_type.IsPointer)
 890                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 891
 892                         if (TypeManager.IsGenericParameter(check_type))
 893                                 return true; // FIXME
 894
 895                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 896
 897                         switch (check_attr){
 898                         case TypeAttributes.Public:
 899                                 return true;
 900
 901                         case TypeAttributes.NotPublic:
 902
 903                                 if (TypeBuilder == null)
 904                                         // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 905                                         //        However, this is invoked again later -- so safe to return true.
 906                                         //        May also be null when resolving top-level attributes.
 907                                         return true;
 908                                 //
 909                                 // This test should probably use the declaringtype.
 910                                 //
 911                                 return check_type.Assembly == TypeBuilder.Assembly ||
 912                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 913
 914                         case TypeAttributes.NestedPublic:
 915                                 return true;
 916
 917                         case TypeAttributes.NestedPrivate:
 918                                 return NestedAccessible (tb, check_type);
 919
 920                         case TypeAttributes.NestedFamily:
 921                                 //
 922                                 // Only accessible to methods in current type or any subtypes
 923                                 //
 924                                 return FamilyAccessible (tb, check_type);
 925
 926                         case TypeAttributes.NestedFamANDAssem:
 927                                 return ((check_type.Assembly == tb.Assembly) ||
 928                                                 TypeManager.IsFriendAssembly (check_type.Assembly)) &&
 929                                         FamilyAccessible (tb, check_type);
 930
 931                         case TypeAttributes.NestedFamORAssem:
 932                                 return (check_type.Assembly == tb.Assembly) ||
 933                                         FamilyAccessible (tb, check_type) ||
 934                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 935
 936                         case TypeAttributes.NestedAssembly:
 937                                 return check_type.Assembly == tb.Assembly ||
 938                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 939                         }
 940
 941                         Console.WriteLine ("HERE: " + check_attr);
 942                         return false;
 943
 944                 }
 945
 946                 protected bool NestedAccessible (Type tb, Type check_type)
 947                 {
 948                         Type declaring = check_type.DeclaringType;
 949                         return TypeBuilder == declaring ||
 950                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 951                 }
 952
 953                 protected bool FamilyAccessible (Type tb, Type check_type)
 954                 {
 955                         Type declaring = check_type.DeclaringType;
 956                         return TypeManager.IsNestedFamilyAccessible (TypeBuilder, declaring);
 957                 }
 958
 959                 // Access level of a type.
 960                 const int X = 1;
 961                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 962                         // Public    Assembly   Protected
 963                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 964                         Public              = (X << 0) | (X << 1) | (X << 2),
 965                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 966                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 967                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 968                 }
 969
 970                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 971                 {
 972                         if ((flags & Modifiers.INTERNAL) != 0) {
 973
 974                                 if ((flags & Modifiers.PROTECTED) != 0)
 975                                         return AccessLevel.ProtectedOrInternal;
 976                                 else
 977                                         return AccessLevel.Internal;
 978
 979                         } else if ((flags & Modifiers.PROTECTED) != 0)
 980                                 return AccessLevel.Protected;
 981                         else if ((flags & Modifiers.PRIVATE) != 0)
 982                                 return AccessLevel.Private;
 983                         else
 984                                 return AccessLevel.Public;
 985                 }
 986
 987                 // What is the effective access level of this?
 988                 // TODO: Cache this?
 989                 AccessLevel EffectiveAccessLevel {
 990                         get {
 991                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 992                                 if (!IsTopLevel && (Parent != null))
 993                                         return myAccess & Parent.EffectiveAccessLevel;
 994                                 return myAccess;
 995                         }
 996                 }
 997
 998                 // Return the access level for type `t'
 999                 static AccessLevel TypeEffectiveAccessLevel (Type t)
1000                 {
1001                         if (t.IsPublic)
1002                                 return AccessLevel.Public;
1003                         if (t.IsNestedPrivate)
1004                                 return AccessLevel.Private;
1005                         if (t.IsNotPublic)
1006                                 return AccessLevel.Internal;
1007
1008                         // By now, it must be nested
1009                         AccessLevel parent_level = TypeEffectiveAccessLevel (t.DeclaringType);
1010
1011                         if (t.IsNestedPublic)
1012                                 return parent_level;
1013                         if (t.IsNestedAssembly)
1014                                 return parent_level & AccessLevel.Internal;
1015                         if (t.IsNestedFamily)
1016                                 return parent_level & AccessLevel.Protected;
1017                         if (t.IsNestedFamORAssem)
1018                                 return parent_level & AccessLevel.ProtectedOrInternal;
1019                         if (t.IsNestedFamANDAssem)
1020                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
1021
1022                         // nested private is taken care of
1023
1024                         throw new Exception ("I give up, what are you?");
1025                 }
1026
1027                 //
1028                 // This answers `is the type P, as accessible as a member M which has the
1029                 // accessability @flags which is declared as a nested member of the type T, this declspace'
1030                 //
1031                 public bool AsAccessible (Type p, int flags)
1032                 {
1033                         //
1034                         // 1) if M is private, its accessability is the same as this declspace.
1035                         // we already know that P is accessible to T before this method, so we
1036                         // may return true.
1037                         //
1038
1039                         if ((flags & Modifiers.PRIVATE) != 0)
1040                                 return true;
1041
1042                         while (p.IsArray || p.IsPointer || p.IsByRef)
1043                                 p = TypeManager.GetElementType (p);
1044
1045 #if GMCS_SOURCE
1046                         if (p.IsGenericParameter)
1047                                 return true;
1048
1049                         if (TypeManager.IsGenericType (p)) {
1050                                 foreach (Type t in p.GetGenericArguments ()) {
1051                                         if (!AsAccessible (t, flags))
1052                                                 return false;
1053                                 }
1054                         }
1055 #endif
1056                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
1057                         AccessLevel mAccess = this.EffectiveAccessLevel &
1058                                 GetAccessLevelFromModifiers (flags);
1059
1060                         // for every place from which we can access M, we must
1061                         // be able to access P as well. So, we want
1062                         // For every bit in M and P, M_i -> P_1 == true
1063                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
1064
1065                         return ~ (~ mAccess | pAccess) == 0;
1066                 }
1067
1068                 private Type LookupNestedTypeInHierarchy (string name)
1069                 {
1070                         // if the member cache has been created, lets use it.
1071                         // the member cache is MUCH faster.
1072                         if (MemberCache != null)
1073                                 return MemberCache.FindNestedType (name);
1074
1075                         // no member cache. Do it the hard way -- reflection
1076                         Type t = null;
1077                         for (Type current_type = TypeBuilder;
1078                              current_type != null && current_type != TypeManager.object_type;
1079                              current_type = current_type.BaseType) {
1080
1081                                 Type ct = TypeManager.DropGenericTypeArguments (current_type);
1082                                 if (ct is TypeBuilder) {
1083                                         TypeContainer tc = ct == TypeBuilder
1084                                                 ? PartialContainer : TypeManager.LookupTypeContainer (ct);
1085                                         if (tc != null)
1086                                                 t = tc.FindNestedType (name);
1087                                 } else {
1088                                         t = TypeManager.GetNestedType (ct, name);
1089                                 }
1090
1091                                 if ((t == null) || !CheckAccessLevel (t))
1092                                         continue;
1093
1094 #if GMCS_SOURCE
1095                                 if (!TypeManager.IsGenericType (current_type))
1096                                         return t;
1097
1098                                 Type[] args = TypeManager.GetTypeArguments (current_type);
1099                                 Type[] targs = TypeManager.GetTypeArguments (t);
1100                                 for (int i = 0; i < args.Length; i++)
1101                                         targs [i] = args [i];
1102
1103                                 t = t.MakeGenericType (targs);
1104 #endif
1105
1106                                 return t;
1107                         }
1108
1109                         return null;
1110                 }
1111
1112                 public virtual ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name)
1113                 {
1114                         return null;
1115                 }
1116
1117                 //
1118                 // Public function used to locate types.
1119                 //
1120                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1121                 //
1122                 // Returns: Type or null if they type can not be found.
1123                 //
1124                 public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
1125                 {
1126                         if (Cache.Contains (name))
1127                                 return (FullNamedExpression) Cache [name];
1128
1129                         FullNamedExpression e;
1130                         Type t = LookupNestedTypeInHierarchy (name);
1131                         if (t != null)
1132                                 e = new TypeExpression (t, Location.Null);
1133                         else if (Parent != null)
1134                                 e = Parent.LookupNamespaceOrType (name, loc, ignore_cs0104);
1135                         else
1136                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
1137
1138                         Cache [name] = e;
1139                         return e;
1140                 }
1141
1142                 /// <remarks>
1143                 ///   This function is broken and not what you're looking for.  It should only
1144                 ///   be used while the type is still being created since it doesn't use the cache
1145                 ///   and relies on the filter doing the member name check.
1146                 /// </remarks>
1147                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1148                                                         MemberFilter filter, object criteria);
1149
1150                 /// <remarks>
1151                 ///   If we have a MemberCache, return it.  This property may return null if the
1152                 ///   class doesn't have a member cache or while it's still being created.
1153                 /// </remarks>
1154                 public abstract MemberCache MemberCache {
1155                         get;
1156                 }
1157
1158                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1159                 {
1160                         if (a.Type == TypeManager.required_attr_type) {
1161                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1162                                 return;
1163                         }
1164                         TypeBuilder.SetCustomAttribute (cb);
1165                 }
1166
1167                 //
1168                 // Extensions for generics
1169                 //
1170                 TypeParameter[] type_params;
1171                 TypeParameter[] type_param_list;
1172
1173                 protected string GetInstantiationName ()
1174                 {
1175                         StringBuilder sb = new StringBuilder (Name);
1176                         sb.Append ("<");
1177                         for (int i = 0; i < type_param_list.Length; i++) {
1178                                 if (i > 0)
1179                                         sb.Append (",");
1180                                 sb.Append (type_param_list [i].Name);
1181                         }
1182                         sb.Append (">");
1183                         return sb.ToString ();
1184                 }
1185
1186                 bool check_type_parameter (ArrayList list, int start, string name)
1187                 {
1188                         for (int i = 0; i < start; i++) {
1189                                 TypeParameter param = (TypeParameter) list [i];
1190
1191                                 if (param.Name != name)
1192                                         continue;
1193
1194                                 Report.SymbolRelatedToPreviousError (Parent);
1195                                 // TODO: Location is wrong (parent instead of child)
1196                                 Report.Warning (693, 3, Location,
1197                                         "Type parameter `{0}' has the same name as the type parameter from outer type `{1}'",
1198                                         name, Parent.GetSignatureForError ());
1199
1200                                 return false;
1201                         }
1202
1203                         return true;
1204                 }
1205
1206                 TypeParameter[] initialize_type_params ()
1207                 {
1208                         if (type_param_list != null)
1209                                 return type_param_list;
1210
1211                         DeclSpace the_parent = Parent;
1212                         if (this is GenericMethod)
1213                                 the_parent = null;
1214
1215                         int start = 0;
1216                         ArrayList list = new ArrayList ();
1217                         if (the_parent != null && the_parent.IsGeneric) {
1218                                 // FIXME: move generics info out of DeclSpace
1219                                 TypeParameter[] parent_params = the_parent.PartialContainer.TypeParameters;
1220                                 start = parent_params.Length;
1221                                 list.AddRange (parent_params);
1222                         }
1223
1224                         int count = type_params != null ? type_params.Length : 0;
1225                         for (int i = 0; i < count; i++) {
1226                                 TypeParameter param = type_params [i];
1227                                 check_type_parameter (list, start, param.Name);
1228                                 list.Add (param);
1229                         }
1230
1231                         type_param_list = new TypeParameter [list.Count];
1232                         list.CopyTo (type_param_list, 0);
1233                         return type_param_list;
1234                 }
1235
1236                 public virtual void SetParameterInfo (ArrayList constraints_list)
1237                 {
1238                         if (!is_generic) {
1239                                 if (constraints_list != null) {
1240                                         Report.Error (
1241                                                 80, Location, "Constraints are not allowed " +
1242                                                 "on non-generic declarations");
1243                                 }
1244
1245                                 return;
1246                         }
1247
1248                         TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1249                         type_params = new TypeParameter [names.Length];
1250
1251                         //
1252                         // Register all the names
1253                         //
1254                         for (int i = 0; i < type_params.Length; i++) {
1255                                 TypeParameterName name = names [i];
1256
1257                                 Constraints constraints = null;
1258                                 if (constraints_list != null) {
1259                                         int total = constraints_list.Count;
1260                                         for (int ii = 0; ii < total; ++ii) {
1261                                                 Constraints constraints_at = (Constraints)constraints_list[ii];
1262                                                 // TODO: it is used by iterators only
1263                                                 if (constraints_at == null) {
1264                                                         constraints_list.RemoveAt (ii);
1265                                                         --total;
1266                                                         continue;
1267                                                 }
1268                                                 if (constraints_at.TypeParameter == name.Name) {
1269                                                         constraints = constraints_at;
1270                                                         constraints_list.RemoveAt(ii);
1271                                                         break;
1272                                                 }
1273                                         }
1274                                 }
1275
1276                                 type_params [i] = new TypeParameter (
1277                                         Parent, this, name.Name, constraints, name.OptAttributes,
1278                                         Location);
1279
1280                                 AddToContainer (type_params [i], name.Name);
1281                         }
1282
1283                         if (constraints_list != null && constraints_list.Count > 0) {
1284                                 foreach (Constraints constraint in constraints_list) {
1285                                         Report.Error(699, constraint.Location, "`{0}': A constraint references nonexistent type parameter `{1}'",
1286                                                 GetSignatureForError (), constraint.TypeParameter);
1287                                 }
1288                         }
1289                 }
1290
1291                 public TypeParameter[] TypeParameters {
1292                         get {
1293                                 if (!IsGeneric)
1294                                         throw new InvalidOperationException ();
1295                                 if ((PartialContainer != null) && (PartialContainer != this))
1296                                         return PartialContainer.TypeParameters;
1297                                 if (type_param_list == null)
1298                                         initialize_type_params ();
1299
1300                                 return type_param_list;
1301                         }
1302                 }
1303
1304                 public TypeParameter[] CurrentTypeParameters {
1305                         get {
1306                                 if (!IsGeneric)
1307                                         throw new InvalidOperationException ();
1308                                 if ((PartialContainer != null) && (PartialContainer != this))
1309                                         return PartialContainer.CurrentTypeParameters;
1310                                 if (type_params != null)
1311                                         return type_params;
1312                                 else
1313                                         return new TypeParameter [0];
1314                         }
1315                 }
1316
1317                 public int CountTypeParameters {
1318                         get {
1319                                 return count_type_params;
1320                         }
1321                 }
1322
1323                 public int CountCurrentTypeParameters {
1324                         get {
1325                                 return count_current_type_params;
1326                         }
1327                 }
1328
1329                 public TypeParameterExpr LookupGeneric (string name, Location loc)
1330                 {
1331                         if (!IsGeneric)
1332                                 return null;
1333
1334                         TypeParameter [] current_params;
1335                         if (this is TypeContainer)
1336                                 current_params = PartialContainer.CurrentTypeParameters;
1337                         else
1338                                 current_params = CurrentTypeParameters;
1339
1340                         foreach (TypeParameter type_param in current_params) {
1341                                 if (type_param.Name == name)
1342                                         return new TypeParameterExpr (type_param, loc);
1343                         }
1344
1345                         if (Parent != null)
1346                                 return Parent.LookupGeneric (name, loc);
1347
1348                         return null;
1349                 }
1350
1351                 // Used for error reporting only
1352                 public virtual Type LookupAnyGeneric (string typeName)
1353                 {
1354                         return NamespaceEntry.NS.LookForAnyGenericType (typeName);
1355                 }
1356
1357                 public override string[] ValidAttributeTargets {
1358                         get { return attribute_targets; }
1359                 }
1360
1361                 protected override bool VerifyClsCompliance ()
1362                 {
1363                         if (!base.VerifyClsCompliance ()) {
1364                                 return false;
1365                         }
1366
1367                         if (type_params != null) {
1368                                 foreach (TypeParameter tp in type_params) {
1369                                         if (tp.Constraints == null)
1370                                                 continue;
1371
1372                                         tp.Constraints.VerifyClsCompliance ();
1373                                 }
1374                         }
1375
1376                         IDictionary cache = TypeManager.AllClsTopLevelTypes;
1377                         if (cache == null)
1378                                 return true;
1379
1380                         string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1381                         if (!cache.Contains (lcase)) {
1382                                 cache.Add (lcase, this);
1383                                 return true;
1384                         }
1385
1386                         object val = cache [lcase];
1387                         if (val == null) {
1388                                 Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
1389                                 if (t == null)
1390                                         return true;
1391                                 Report.SymbolRelatedToPreviousError (t);
1392                         }
1393                         else {
1394                                 Report.SymbolRelatedToPreviousError ((DeclSpace)val);
1395                         }
1396 #if GMCS_SOURCE
1397                         Report.Warning (3005, 1, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1398 #else
1399                         Report.Error (3005, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1400 #endif
1401                         return true;
1402                 }
1403         }
1404
1405         /// <summary>
1406         ///   This is a readonly list of MemberInfo's.
1407         /// </summary>
1408         public class MemberList : IList {
1409                 public readonly IList List;
1410                 int count;
1411
1412                 /// <summary>
1413                 ///   Create a new MemberList from the given IList.
1414                 /// </summary>
1415                 public MemberList (IList list)
1416                 {
1417                         if (list != null)
1418                                 this.List = list;
1419                         else
1420                                 this.List = new ArrayList ();
1421                         count = List.Count;
1422                 }
1423
1424                 /// <summary>
1425                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1426                 /// </summary>
1427                 public MemberList (IList first, IList second)
1428                 {
1429                         ArrayList list = new ArrayList ();
1430                         list.AddRange (first);
1431                         list.AddRange (second);
1432                         count = list.Count;
1433                         List = list;
1434                 }
1435
1436                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1437
1438                 /// <summary>
1439                 ///   Cast the MemberList into a MemberInfo[] array.
1440                 /// </summary>
1441                 /// <remarks>
1442                 ///   This is an expensive operation, only use it if it's really necessary.
1443                 /// </remarks>
1444                 public static explicit operator MemberInfo [] (MemberList list)
1445                 {
1446                         Timer.StartTimer (TimerType.MiscTimer);
1447                         MemberInfo [] result = new MemberInfo [list.Count];
1448                         list.CopyTo (result, 0);
1449                         Timer.StopTimer (TimerType.MiscTimer);
1450                         return result;
1451                 }
1452
1453                 // ICollection
1454
1455                 public int Count {
1456                         get {
1457                                 return count;
1458                         }
1459                 }
1460
1461                 public bool IsSynchronized {
1462                         get {
1463                                 return List.IsSynchronized;
1464                         }
1465                 }
1466
1467                 public object SyncRoot {
1468                         get {
1469                                 return List.SyncRoot;
1470                         }
1471                 }
1472
1473                 public void CopyTo (Array array, int index)
1474                 {
1475                         List.CopyTo (array, index);
1476                 }
1477
1478                 // IEnumerable
1479
1480                 public IEnumerator GetEnumerator ()
1481                 {
1482                         return List.GetEnumerator ();
1483                 }
1484
1485                 // IList
1486
1487                 public bool IsFixedSize {
1488                         get {
1489                                 return true;
1490                         }
1491                 }
1492
1493                 public bool IsReadOnly {
1494                         get {
1495                                 return true;
1496                         }
1497                 }
1498
1499                 object IList.this [int index] {
1500                         get {
1501                                 return List [index];
1502                         }
1503
1504                         set {
1505                                 throw new NotSupportedException ();
1506                         }
1507                 }
1508
1509                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1510                 public MemberInfo this [int index] {
1511                         get {
1512                                 return (MemberInfo) List [index];
1513                         }
1514                 }
1515
1516                 public int Add (object value)
1517                 {
1518                         throw new NotSupportedException ();
1519                 }
1520
1521                 public void Clear ()
1522                 {
1523                         throw new NotSupportedException ();
1524                 }
1525
1526                 public bool Contains (object value)
1527                 {
1528                         return List.Contains (value);
1529                 }
1530
1531                 public int IndexOf (object value)
1532                 {
1533                         return List.IndexOf (value);
1534                 }
1535
1536                 public void Insert (int index, object value)
1537                 {
1538                         throw new NotSupportedException ();
1539                 }
1540
1541                 public void Remove (object value)
1542                 {
1543                         throw new NotSupportedException ();
1544                 }
1545
1546                 public void RemoveAt (int index)
1547                 {
1548                         throw new NotSupportedException ();
1549                 }
1550         }
1551
1552         /// <summary>
1553         ///   This interface is used to get all members of a class when creating the
1554         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1555         ///   want to support the member cache and by TypeHandle to get caching of
1556         ///   non-dynamic types.
1557         /// </summary>
1558         public interface IMemberContainer {
1559                 /// <summary>
1560                 ///   The name of the IMemberContainer.  This is only used for
1561                 ///   debugging purposes.
1562                 /// </summary>
1563                 string Name {
1564                         get;
1565                 }
1566
1567                 /// <summary>
1568                 ///   The type of this IMemberContainer.
1569                 /// </summary>
1570                 Type Type {
1571                         get;
1572                 }
1573
1574                 /// <summary>
1575                 ///   Returns the IMemberContainer of the base class or null if this
1576                 ///   is an interface or TypeManger.object_type.
1577                 ///   This is used when creating the member cache for a class to get all
1578                 ///   members from the base class.
1579                 /// </summary>
1580                 MemberCache BaseCache {
1581                         get;
1582                 }
1583
1584                 /// <summary>
1585                 ///   Whether this is an interface.
1586                 /// </summary>
1587                 bool IsInterface {
1588                         get;
1589                 }
1590
1591                 /// <summary>
1592                 ///   Returns all members of this class with the corresponding MemberTypes
1593                 ///   and BindingFlags.
1594                 /// </summary>
1595                 /// <remarks>
1596                 ///   When implementing this method, make sure not to return any inherited
1597                 ///   members and check the MemberTypes and BindingFlags properly.
1598                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1599                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1600                 ///   MemberInfo class, but the cache needs this information.  That's why
1601                 ///   this method is called multiple times with different BindingFlags.
1602                 /// </remarks>
1603                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1604
1605                 /// <summary>
1606                 ///   Return the container's member cache.
1607                 /// </summary>
1608                 MemberCache MemberCache {
1609                         get;
1610                 }
1611         }
1612
1613         /// <summary>
1614         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1615         ///   member lookups.  It has a member name based hash table; it maps each member
1616         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1617         ///   and the BindingFlags that were initially used to get it.  The cache contains
1618         ///   all members of the current class and all inherited members.  If this cache is
1619         ///   for an interface types, it also contains all inherited members.
1620         ///
1621         ///   There are two ways to get a MemberCache:
1622         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1623         ///     use the DeclSpace.MemberCache property.
1624         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1625         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1626         /// </summary>
1627         public class MemberCache {
1628                 public readonly IMemberContainer Container;
1629                 protected Hashtable member_hash;
1630                 protected Hashtable method_hash;
1631
1632                 /// <summary>
1633                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1634                 /// </summary>
1635                 public MemberCache (IMemberContainer container)
1636                 {
1637                         this.Container = container;
1638
1639                         Timer.IncrementCounter (CounterType.MemberCache);
1640                         Timer.StartTimer (TimerType.CacheInit);
1641
1642                         // If we have a base class (we have a base class unless we're
1643                         // TypeManager.object_type), we deep-copy its MemberCache here.
1644                         if (Container.BaseCache != null)
1645                                 member_hash = SetupCache (Container.BaseCache);
1646                         else
1647                                 member_hash = new Hashtable ();
1648
1649                         // If this is neither a dynamic type nor an interface, create a special
1650                         // method cache with all declared and inherited methods.
1651                         Type type = container.Type;
1652                         if (!(type is TypeBuilder) && !type.IsInterface &&
1653                             // !(type.IsGenericType && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
1654                             !TypeManager.IsGenericType (type) && !TypeManager.IsGenericParameter (type) &&
1655                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1656                                 method_hash = new Hashtable ();
1657                                 AddMethods (type);
1658                         }
1659
1660                         // Add all members from the current class.
1661                         AddMembers (Container);
1662
1663                         Timer.StopTimer (TimerType.CacheInit);
1664                 }
1665
1666                 public MemberCache (Type[] ifaces)
1667                 {
1668                         //
1669                         // The members of this cache all belong to other caches.
1670                         // So, 'Container' will not be used.
1671                         //
1672                         this.Container = null;
1673
1674                         member_hash = new Hashtable ();
1675                         if (ifaces == null)
1676                                 return;
1677
1678                         foreach (Type itype in ifaces)
1679                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1680                 }
1681
1682                 public MemberCache (IMemberContainer container, Type base_class, Type[] ifaces)
1683                 {
1684                         this.Container = container;
1685
1686                         // If we have a base class (we have a base class unless we're
1687                         // TypeManager.object_type), we deep-copy its MemberCache here.
1688                         if (Container.BaseCache != null)
1689                                 member_hash = SetupCache (Container.BaseCache);
1690                         else
1691                                 member_hash = new Hashtable ();
1692
1693                         if (base_class != null)
1694                                 AddCacheContents (TypeManager.LookupMemberCache (base_class));
1695                         if (ifaces != null) {
1696                                 foreach (Type itype in ifaces) {
1697                                         MemberCache cache = TypeManager.LookupMemberCache (itype);
1698                                         if (cache != null)
1699                                                 AddCacheContents (cache);
1700                                 }
1701                         }
1702                 }
1703
1704                 /// <summary>
1705                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1706                 /// </summary>
1707                 static Hashtable SetupCache (MemberCache base_class)
1708                 {
1709                         Hashtable hash = new Hashtable ();
1710
1711                         if (base_class == null)
1712                                 return hash;
1713
1714                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1715                         while (it.MoveNext ()) {
1716                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1717                          }
1718
1719                         return hash;
1720                 }
1721
1722                 /// <summary>
1723                 ///   Add the contents of `cache' to the member_hash.
1724                 /// </summary>
1725                 void AddCacheContents (MemberCache cache)
1726                 {
1727                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1728                         while (it.MoveNext ()) {
1729                                 ArrayList list = (ArrayList) member_hash [it.Key];
1730                                 if (list == null)
1731                                         member_hash [it.Key] = list = new ArrayList ();
1732
1733                                 ArrayList entries = (ArrayList) it.Value;
1734                                 for (int i = entries.Count-1; i >= 0; i--) {
1735                                         CacheEntry entry = (CacheEntry) entries [i];
1736
1737                                         if (entry.Container != cache.Container)
1738                                                 break;
1739                                         list.Add (entry);
1740                                 }
1741                         }
1742                 }
1743
1744                 /// <summary>
1745                 ///   Add all members from class `container' to the cache.
1746                 /// </summary>
1747                 void AddMembers (IMemberContainer container)
1748                 {
1749                         // We need to call AddMembers() with a single member type at a time
1750                         // to get the member type part of CacheEntry.EntryType right.
1751                         if (!container.IsInterface) {
1752                                 AddMembers (MemberTypes.Constructor, container);
1753                                 AddMembers (MemberTypes.Field, container);
1754                         }
1755                         AddMembers (MemberTypes.Method, container);
1756                         AddMembers (MemberTypes.Property, container);
1757                         AddMembers (MemberTypes.Event, container);
1758                         // Nested types are returned by both Static and Instance searches.
1759                         AddMembers (MemberTypes.NestedType,
1760                                     BindingFlags.Static | BindingFlags.Public, container);
1761                         AddMembers (MemberTypes.NestedType,
1762                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1763                 }
1764
1765                 void AddMembers (MemberTypes mt, IMemberContainer container)
1766                 {
1767                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1768                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1769                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1770                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1771                 }
1772
1773                 void AddMember (MemberTypes mt, BindingFlags bf, IMemberContainer container,
1774                                 string name, MemberInfo member)
1775                 {
1776                         // We use a name-based hash table of ArrayList's.
1777                         ArrayList list = (ArrayList) member_hash [name];
1778                         if (list == null) {
1779                                 list = new ArrayList ();
1780                                 member_hash.Add (name, list);
1781                         }
1782
1783                         // When this method is called for the current class, the list will
1784                         // already contain all inherited members from our base classes.
1785                         // We cannot add new members in front of the list since this'd be an
1786                         // expensive operation, that's why the list is sorted in reverse order
1787                         // (ie. members from the current class are coming last).
1788                         list.Add (new CacheEntry (container, member, mt, bf));
1789                 }
1790
1791                 /// <summary>
1792                 ///   Add all members from class `container' with the requested MemberTypes and
1793                 ///   BindingFlags to the cache.  This method is called multiple times with different
1794                 ///   MemberTypes and BindingFlags.
1795                 /// </summary>
1796                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1797                 {
1798                         MemberList members = container.GetMembers (mt, bf);
1799
1800                         foreach (MemberInfo member in members) {
1801                                 string name = member.Name;
1802
1803                                 AddMember (mt, bf, container, name, member);
1804
1805                                 if (member is MethodInfo) {
1806                                         string gname = TypeManager.GetMethodName ((MethodInfo) member);
1807                                         if (gname != name)
1808                                                 AddMember (mt, bf, container, gname, member);
1809                                 }
1810                         }
1811                 }
1812
1813                 /// <summary>
1814                 ///   Add all declared and inherited methods from class `type' to the method cache.
1815                 /// </summary>
1816                 void AddMethods (Type type)
1817                 {
1818                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1819                                     BindingFlags.FlattenHierarchy, type);
1820                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1821                                     BindingFlags.FlattenHierarchy, type);
1822                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1823                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1824                 }
1825
1826                 static ArrayList overrides = new ArrayList ();
1827
1828                 void AddMethods (BindingFlags bf, Type type)
1829                 {
1830                         MethodBase [] members = type.GetMethods (bf);
1831
1832                         Array.Reverse (members);
1833
1834                         foreach (MethodBase member in members) {
1835                                 string name = member.Name;
1836
1837                                 // We use a name-based hash table of ArrayList's.
1838                                 ArrayList list = (ArrayList) method_hash [name];
1839                                 if (list == null) {
1840                                         list = new ArrayList ();
1841                                         method_hash.Add (name, list);
1842                                 }
1843
1844                                 MethodInfo curr = (MethodInfo) member;
1845                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1846                                         MethodInfo base_method = curr.GetBaseDefinition ();
1847
1848                                         if (base_method == curr)
1849                                                 // Not every virtual function needs to have a NewSlot flag.
1850                                                 break;
1851
1852                                         overrides.Add (curr);
1853                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1854                                         curr = base_method;
1855                                 }
1856
1857                                 if (overrides.Count > 0) {
1858                                         for (int i = 0; i < overrides.Count; ++i)
1859                                                 TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
1860                                         overrides.Clear ();
1861                                 }
1862
1863                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1864                                 // sorted so we need to do this check for every member.
1865                                 BindingFlags new_bf = bf;
1866                                 if (member.DeclaringType == type)
1867                                         new_bf |= BindingFlags.DeclaredOnly;
1868
1869                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1870                         }
1871                 }
1872
1873                 /// <summary>
1874                 ///   Compute and return a appropriate `EntryType' magic number for the given
1875                 ///   MemberTypes and BindingFlags.
1876                 /// </summary>
1877                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1878                 {
1879                         EntryType type = EntryType.None;
1880
1881                         if ((mt & MemberTypes.Constructor) != 0)
1882                                 type |= EntryType.Constructor;
1883                         if ((mt & MemberTypes.Event) != 0)
1884                                 type |= EntryType.Event;
1885                         if ((mt & MemberTypes.Field) != 0)
1886                                 type |= EntryType.Field;
1887                         if ((mt & MemberTypes.Method) != 0)
1888                                 type |= EntryType.Method;
1889                         if ((mt & MemberTypes.Property) != 0)
1890                                 type |= EntryType.Property;
1891                         // Nested types are returned by static and instance searches.
1892                         if ((mt & MemberTypes.NestedType) != 0)
1893                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1894
1895                         if ((bf & BindingFlags.Instance) != 0)
1896                                 type |= EntryType.Instance;
1897                         if ((bf & BindingFlags.Static) != 0)
1898                                 type |= EntryType.Static;
1899                         if ((bf & BindingFlags.Public) != 0)
1900                                 type |= EntryType.Public;
1901                         if ((bf & BindingFlags.NonPublic) != 0)
1902                                 type |= EntryType.NonPublic;
1903                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1904                                 type |= EntryType.Declared;
1905
1906                         return type;
1907                 }
1908
1909                 /// <summary>
1910                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1911                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1912                 ///   single member types.
1913                 /// </summary>
1914                 public static bool IsSingleMemberType (MemberTypes mt)
1915                 {
1916                         switch (mt) {
1917                         case MemberTypes.Constructor:
1918                         case MemberTypes.Event:
1919                         case MemberTypes.Field:
1920                         case MemberTypes.Method:
1921                         case MemberTypes.Property:
1922                         case MemberTypes.NestedType:
1923                                 return true;
1924
1925                         default:
1926                                 return false;
1927                         }
1928                 }
1929
1930                 /// <summary>
1931                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1932                 ///   number to speed up the searching process.
1933                 /// </summary>
1934                 [Flags]
1935                 protected enum EntryType {
1936                         None            = 0x000,
1937
1938                         Instance        = 0x001,
1939                         Static          = 0x002,
1940                         MaskStatic      = Instance|Static,
1941
1942                         Public          = 0x004,
1943                         NonPublic       = 0x008,
1944                         MaskProtection  = Public|NonPublic,
1945
1946                         Declared        = 0x010,
1947
1948                         Constructor     = 0x020,
1949                         Event           = 0x040,
1950                         Field           = 0x080,
1951                         Method          = 0x100,
1952                         Property        = 0x200,
1953                         NestedType      = 0x400,
1954
1955                         NotExtensionMethod      = 0x800,
1956
1957                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1958                 }
1959
1960                 protected class CacheEntry {
1961                         public readonly IMemberContainer Container;
1962                         public EntryType EntryType;
1963                         public readonly MemberInfo Member;
1964
1965                         public CacheEntry (IMemberContainer container, MemberInfo member,
1966                                            MemberTypes mt, BindingFlags bf)
1967                         {
1968                                 this.Container = container;
1969                                 this.Member = member;
1970                                 this.EntryType = GetEntryType (mt, bf);
1971                         }
1972
1973                         public override string ToString ()
1974                         {
1975                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1976                                                       EntryType, Member);
1977                         }
1978                 }
1979
1980                 /// <summary>
1981                 ///   This is called each time we're walking up one level in the class hierarchy
1982                 ///   and checks whether we can abort the search since we've already found what
1983                 ///   we were looking for.
1984                 /// </summary>
1985                 protected bool DoneSearching (ArrayList list)
1986                 {
1987                         //
1988                         // We've found exactly one member in the current class and it's not
1989                         // a method or constructor.
1990                         //
1991                         if (list.Count == 1 && !(list [0] is MethodBase))
1992                                 return true;
1993
1994                         //
1995                         // Multiple properties: we query those just to find out the indexer
1996                         // name
1997                         //
1998                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1999                                 return true;
2000
2001                         return false;
2002                 }
2003
2004                 /// <summary>
2005                 ///   Looks up members with name `name'.  If you provide an optional
2006                 ///   filter function, it'll only be called with members matching the
2007                 ///   requested member name.
2008                 ///
2009                 ///   This method will try to use the cache to do the lookup if possible.
2010                 ///
2011                 ///   Unlike other FindMembers implementations, this method will always
2012                 ///   check all inherited members - even when called on an interface type.
2013                 ///
2014                 ///   If you know that you're only looking for methods, you should use
2015                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
2016                 ///   When doing a method-only search, it'll try to use a special method
2017                 ///   cache (unless it's a dynamic type or an interface) and the returned
2018                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
2019                 ///   The lookup process will automatically restart itself in method-only
2020                 ///   search mode if it discovers that it's about to return methods.
2021                 /// </summary>
2022                 ArrayList global = new ArrayList ();
2023                 bool using_global = false;
2024
2025                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
2026
2027                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
2028                                                   MemberFilter filter, object criteria)
2029                 {
2030                         if (using_global)
2031                                 throw new Exception ();
2032
2033                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
2034                         bool method_search = mt == MemberTypes.Method;
2035                         // If we have a method cache and we aren't already doing a method-only search,
2036                         // then we restart a method search if the first match is a method.
2037                         bool do_method_search = !method_search && (method_hash != null);
2038
2039                         ArrayList applicable;
2040
2041                         // If this is a method-only search, we try to use the method cache if
2042                         // possible; a lookup in the method cache will return a MemberInfo with
2043                         // the correct ReflectedType for inherited methods.
2044
2045                         if (method_search && (method_hash != null))
2046                                 applicable = (ArrayList) method_hash [name];
2047                         else
2048                                 applicable = (ArrayList) member_hash [name];
2049
2050                         if (applicable == null)
2051                                 return emptyMemberInfo;
2052
2053                         //
2054                         // 32  slots gives 53 rss/54 size
2055                         // 2/4 slots gives 55 rss
2056                         //
2057                         // Strange: from 25,000 calls, only 1,800
2058                         // are above 2.  Why does this impact it?
2059                         //
2060                         global.Clear ();
2061                         using_global = true;
2062
2063                         Timer.StartTimer (TimerType.CachedLookup);
2064
2065                         EntryType type = GetEntryType (mt, bf);
2066
2067                         IMemberContainer current = Container;
2068
2069                         bool do_interface_search = current.IsInterface;
2070
2071                         // `applicable' is a list of all members with the given member name `name'
2072                         // in the current class and all its base classes.  The list is sorted in
2073                         // reverse order due to the way how the cache is initialy created (to speed
2074                         // things up, we're doing a deep-copy of our base).
2075
2076                         for (int i = applicable.Count-1; i >= 0; i--) {
2077                                 CacheEntry entry = (CacheEntry) applicable [i];
2078
2079                                 // This happens each time we're walking one level up in the class
2080                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
2081                                 // the first time this happens (this may already happen in the first
2082                                 // iteration of this loop if there are no members with the name we're
2083                                 // looking for in the current class).
2084                                 if (entry.Container != current) {
2085                                         if (declared_only)
2086                                                 break;
2087
2088                                         if (!do_interface_search && DoneSearching (global))
2089                                                 break;
2090
2091                                         current = entry.Container;
2092                                 }
2093
2094                                 // Is the member of the correct type ?
2095                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2096                                         continue;
2097
2098                                 // Is the member static/non-static ?
2099                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2100                                         continue;
2101
2102                                 // Apply the filter to it.
2103                                 if (filter (entry.Member, criteria)) {
2104                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method) {
2105                                                 do_method_search = false;
2106                                         }
2107
2108                                         // Because interfaces support multiple inheritance we have to be sure that
2109                                         // base member is from same interface, so only top level member will be returned
2110                                         if (do_interface_search && global.Count > 0) {
2111                                                 bool member_already_exists = false;
2112
2113                                                 foreach (MemberInfo mi in global) {
2114                                                         if (mi is MethodBase)
2115                                                                 continue;
2116
2117                                                         if (IsInterfaceBaseInterface (TypeManager.GetInterfaces (mi.DeclaringType), entry.Member.DeclaringType)) {
2118                                                                 member_already_exists = true;
2119                                                                 break;
2120                                                         }
2121                                                 }
2122                                                 if (member_already_exists)
2123                                                         continue;
2124                                         }
2125
2126                                         global.Add (entry.Member);
2127                                 }
2128                         }
2129
2130                         Timer.StopTimer (TimerType.CachedLookup);
2131
2132                         // If we have a method cache and we aren't already doing a method-only
2133                         // search, we restart in method-only search mode if the first match is
2134                         // a method.  This ensures that we return a MemberInfo with the correct
2135                         // ReflectedType for inherited methods.
2136                         if (do_method_search && (global.Count > 0)){
2137                                 using_global = false;
2138
2139                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2140                         }
2141
2142                         using_global = false;
2143                         MemberInfo [] copy = new MemberInfo [global.Count];
2144                         global.CopyTo (copy);
2145                         return copy;
2146                 }
2147
2148                 /// <summary>
2149                 /// Returns true if iterface exists in any base interfaces (ifaces)
2150                 /// </summary>
2151                 static bool IsInterfaceBaseInterface (Type[] ifaces, Type ifaceToFind)
2152                 {
2153                         foreach (Type iface in ifaces) {
2154                                 if (iface == ifaceToFind)
2155                                         return true;
2156
2157                                 Type[] base_ifaces = TypeManager.GetInterfaces (iface);
2158                                 if (base_ifaces.Length > 0 && IsInterfaceBaseInterface (base_ifaces, ifaceToFind))
2159                                         return true;
2160                         }
2161                         return false;
2162                 }
2163
2164                 // find the nested type @name in @this.
2165                 public Type FindNestedType (string name)
2166                 {
2167                         ArrayList applicable = (ArrayList) member_hash [name];
2168                         if (applicable == null)
2169                                 return null;
2170
2171                         for (int i = applicable.Count-1; i >= 0; i--) {
2172                                 CacheEntry entry = (CacheEntry) applicable [i];
2173                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
2174                                         return (Type) entry.Member;
2175                         }
2176
2177                         return null;
2178                 }
2179
2180                 public MemberInfo FindBaseEvent (Type invocation_type, string name)
2181                 {
2182                         ArrayList applicable = (ArrayList) member_hash [name];
2183                         if (applicable == null)
2184                                 return null;
2185
2186                         //
2187                         // Walk the chain of events, starting from the top.
2188                         //
2189                         for (int i = applicable.Count - 1; i >= 0; i--)
2190                         {
2191                                 CacheEntry entry = (CacheEntry) applicable [i];
2192                                 if ((entry.EntryType & EntryType.Event) == 0)
2193                                         continue;
2194
2195                                 EventInfo ei = (EventInfo)entry.Member;
2196                                 return ei.GetAddMethod (true);
2197                         }
2198
2199                         return null;
2200                 }
2201
2202                 //
2203                 // Looks for extension methods with defined name and extension type
2204                 //
2205                 public ArrayList FindExtensionMethods (Type extensionType, string name, bool publicOnly)
2206                 {
2207                         ArrayList entries;
2208                         if (method_hash != null)
2209                                 entries = (ArrayList)method_hash [name];
2210                         else
2211                                 entries = (ArrayList)member_hash [name];
2212
2213                         if (entries == null)
2214                                 return null;
2215
2216                         EntryType entry_type = EntryType.Static | EntryType.Method | EntryType.NotExtensionMethod;
2217                         if (publicOnly) {
2218                                 entry_type |= EntryType.Public;
2219                         }
2220                         EntryType found_entry_type = entry_type & ~EntryType.NotExtensionMethod;
2221
2222                         ArrayList candidates = null;
2223                         foreach (CacheEntry entry in entries) {
2224                                 if ((entry.EntryType & entry_type) == found_entry_type) {
2225                                         MethodBase mb = (MethodBase)entry.Member;
2226
2227                                         IMethodData md = TypeManager.GetMethod (mb);
2228                                         ParameterData pd = md == null ?
2229                                                 TypeManager.GetParameterData (mb) : md.ParameterInfo;
2230
2231                                         Type ex_type = pd.ExtensionMethodType;
2232                                         if (ex_type == null) {
2233                                                 entry.EntryType |= EntryType.NotExtensionMethod;
2234                                                 continue;
2235                                         }
2236
2237                                         //if (implicit conversion between ex_type and extensionType exist) {
2238                                                 if (candidates == null)
2239                                                         candidates = new ArrayList (2);
2240                                                 candidates.Add (mb);
2241                                         //}
2242                                 }
2243                         }
2244
2245                         return candidates;
2246                 }
2247
2248                 //
2249                 // This finds the method or property for us to override. invocation_type is the type where
2250                 // the override is going to be declared, name is the name of the method/property, and
2251                 // param_types is the parameters, if any to the method or property
2252                 //
2253                 // Because the MemberCache holds members from this class and all the base classes,
2254                 // we can avoid tons of reflection stuff.
2255                 //
2256                 public MemberInfo FindMemberToOverride (Type invocation_type, string name, Type [] param_types, GenericMethod generic_method, bool is_property)
2257                 {
2258                         ArrayList applicable;
2259                         if (method_hash != null && !is_property)
2260                                 applicable = (ArrayList) method_hash [name];
2261                         else
2262                                 applicable = (ArrayList) member_hash [name];
2263
2264                         if (applicable == null)
2265                                 return null;
2266                         //
2267                         // Walk the chain of methods, starting from the top.
2268                         //
2269                         for (int i = applicable.Count - 1; i >= 0; i--) {
2270                                 CacheEntry entry = (CacheEntry) applicable [i];
2271
2272                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2273                                         continue;
2274
2275                                 PropertyInfo pi = null;
2276                                 MethodInfo mi = null;
2277                                 FieldInfo fi = null;
2278                                 Type [] cmp_attrs = null;
2279
2280                                 if (is_property) {
2281                                         if ((entry.EntryType & EntryType.Field) != 0) {
2282                                                 fi = (FieldInfo)entry.Member;
2283
2284                                                 // TODO: For this case we ignore member type
2285                                                 //fb = TypeManager.GetField (fi);
2286                                                 //cmp_attrs = new Type[] { fb.MemberType };
2287                                         } else {
2288                                                 pi = (PropertyInfo) entry.Member;
2289                                                 cmp_attrs = TypeManager.GetArgumentTypes (pi);
2290                                         }
2291                                 } else {
2292                                         mi = (MethodInfo) entry.Member;
2293                                         cmp_attrs = TypeManager.GetParameterData (mi).Types;
2294                                 }
2295
2296                                 if (fi != null) {
2297                                         // TODO: Almost duplicate !
2298                                         // Check visibility
2299                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2300                                         case FieldAttributes.PrivateScope:
2301                                                 continue;
2302                                         case FieldAttributes.Private:
2303                                                 //
2304                                                 // A private method is Ok if we are a nested subtype.
2305                                                 // The spec actually is not very clear about this, see bug 52458.
2306                                                 //
2307                                                 if (!invocation_type.Equals (entry.Container.Type) &&
2308                                                     !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
2309                                                         continue;
2310                                                 break;
2311                                         case FieldAttributes.FamANDAssem:
2312                                         case FieldAttributes.Assembly:
2313                                                 //
2314                                                 // Check for assembly methods
2315                                                 //
2316                                                 if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2317                                                         continue;
2318                                                 break;
2319                                         }
2320                                         return entry.Member;
2321                                 }
2322
2323                                 //
2324                                 // Check the arguments
2325                                 //
2326                                 if (cmp_attrs.Length != param_types.Length)
2327                                         continue;
2328
2329                                 int j;
2330                                 for (j = 0; j < cmp_attrs.Length; ++j)
2331                                         if (!TypeManager.IsEqual (param_types [j], cmp_attrs [j]))
2332                                                 break;
2333                                 if (j < cmp_attrs.Length)
2334                                         continue;
2335
2336                                 //
2337                                 // check generic arguments for methods
2338                                 //
2339                                 if (mi != null) {
2340                                         Type [] cmpGenArgs = TypeManager.GetGenericArguments (mi);
2341                                         if (generic_method == null && cmpGenArgs.Length != 0)
2342                                                 continue;
2343                                         if (generic_method != null && cmpGenArgs.Length != generic_method.TypeParameters.Length)
2344                                                 continue;
2345                                 }
2346
2347                                 //
2348                                 // get one of the methods because this has the visibility info.
2349                                 //
2350                                 if (is_property) {
2351                                         mi = pi.GetGetMethod (true);
2352                                         if (mi == null)
2353                                                 mi = pi.GetSetMethod (true);
2354                                 }
2355
2356                                 //
2357                                 // Check visibility
2358                                 //
2359                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2360                                 case MethodAttributes.PrivateScope:
2361                                         continue;
2362                                 case MethodAttributes.Private:
2363                                         //
2364                                         // A private method is Ok if we are a nested subtype.
2365                                         // The spec actually is not very clear about this, see bug 52458.
2366                                         //
2367                                         if (!invocation_type.Equals (entry.Container.Type) &&
2368                                             !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
2369                                                 continue;
2370                                         break;
2371                                 case MethodAttributes.FamANDAssem:
2372                                 case MethodAttributes.Assembly:
2373                                         //
2374                                         // Check for assembly methods
2375                                         //
2376                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2377                                                 continue;
2378                                         break;
2379                                 }
2380                                 return entry.Member;
2381                         }
2382
2383                         return null;
2384                 }
2385
2386                 /// <summary>
2387                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2388                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2389                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2390                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2391                 /// </summary>
2392                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2393                 {
2394                         ArrayList applicable = null;
2395
2396                         if (method_hash != null)
2397                                 applicable = (ArrayList) method_hash [name];
2398
2399                         if (applicable != null) {
2400                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2401                                         CacheEntry entry = (CacheEntry) applicable [i];
2402                                         if ((entry.EntryType & EntryType.Public) != 0)
2403                                                 return entry.Member;
2404                                 }
2405                         }
2406
2407                         if (member_hash == null)
2408                                 return null;
2409                         applicable = (ArrayList) member_hash [name];
2410
2411                         if (applicable != null) {
2412                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2413                                         CacheEntry entry = (CacheEntry) applicable [i];
2414                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2415                                                 if (ignore_complex_types) {
2416                                                         if ((entry.EntryType & EntryType.Method) != 0)
2417                                                                 continue;
2418
2419                                                         // Does exist easier way how to detect indexer ?
2420                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2421                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
2422                                                                 if (arg_types.Length > 0)
2423                                                                         continue;
2424                                                         }
2425                                                 }
2426                                                 return entry.Member;
2427                                         }
2428                                 }
2429                         }
2430                         return null;
2431                 }
2432
2433                 Hashtable locase_table;
2434
2435                 /// <summary>
2436                 /// Builds low-case table for CLS Compliance test
2437                 /// </summary>
2438                 public Hashtable GetPublicMembers ()
2439                 {
2440                         if (locase_table != null)
2441                                 return locase_table;
2442
2443                         locase_table = new Hashtable ();
2444                         foreach (DictionaryEntry entry in member_hash) {
2445                                 ArrayList members = (ArrayList)entry.Value;
2446                                 for (int ii = 0; ii < members.Count; ++ii) {
2447                                         CacheEntry member_entry = (CacheEntry) members [ii];
2448
2449                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2450                                                 continue;
2451
2452                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2453                                         switch (member_entry.EntryType & EntryType.MaskType) {
2454                                                 case EntryType.Constructor:
2455                                                         continue;
2456
2457                                                 case EntryType.Field:
2458                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2459                                                                 continue;
2460                                                         break;
2461
2462                                                 case EntryType.Method:
2463                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2464                                                                 continue;
2465                                                         break;
2466
2467                                                 case EntryType.Property:
2468                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
2469                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2470                                                                 continue;
2471                                                         break;
2472
2473                                                 case EntryType.Event:
2474                                                         EventInfo ei = (EventInfo)member_entry.Member;
2475                                                         MethodInfo mi = ei.GetAddMethod ();
2476                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2477                                                                 continue;
2478                                                         break;
2479                                         }
2480                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2481                                         locase_table [lcase] = member_entry.Member;
2482                                         break;
2483                                 }
2484                         }
2485                         return locase_table;
2486                 }
2487
2488                 public Hashtable Members {
2489                         get {
2490                                 return member_hash;
2491                         }
2492                 }
2493
2494                 /// <summary>
2495                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2496                 /// </summary>
2497                 ///
2498                 // TODO: refactor as method is always 'this'
2499                 public static void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2500                 {
2501                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2502
2503                         for (int i = 0; i < al.Count; ++i) {
2504                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2505
2506                                 // skip itself
2507                                 if (entry.Member == this_builder)
2508                                         continue;
2509
2510                                 if ((entry.EntryType & tested_type) != tested_type)
2511                                         continue;
2512
2513                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2514                                 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
2515                                         method.ParameterTypes, TypeManager.GetParameterData (method_to_compare).Types);
2516
2517                                 if (result == AttributeTester.Result.Ok)
2518                                         continue;
2519
2520                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2521
2522                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2523                                 // However it is exactly what csc does.
2524                                 if (md != null && !md.IsClsComplianceRequired ())
2525                                         continue;
2526
2527                                 Report.SymbolRelatedToPreviousError (entry.Member);
2528                                 switch (result) {
2529                                         case AttributeTester.Result.RefOutArrayError:
2530                                                 Report.Error (3006, method.Location, "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2531                                                 continue;
2532                                         case AttributeTester.Result.ArrayArrayError:
2533                                                 Report.Error (3007, method.Location, "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant", method.GetSignatureForError ());
2534                                                 continue;
2535                                 }
2536
2537                                 throw new NotImplementedException (result.ToString ());
2538                         }
2539                 }
2540         }
2541 }