mcs/gmcs/decl.cs

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