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.GetFullName () + "." + Name;
  94                         else
  95                                 return Name;
  96                 }
  97
  98                 public string GetFullName ()
  99                 {
 100                         string full_name;
 101                         if (TypeArguments != null)
 102                                 full_name = Name + "<" + TypeArguments + ">";
 103                         else
 104                                 full_name = Name;
 105                         if (Left != null)
 106                                 return Left.GetFullName () + "." + full_name;
 107                         else
 108                                 return full_name;
 109                 }
 110
 111                 public static string MakeName (string name, TypeArguments args)
 112                 {
 113                         if (args == null)
 114                                 return name;
 115                         else
 116                                 return name + "`" + args.Count;
 117                 }
 118
 119                 public static string MakeName (string name, int count)
 120                 {
 121                         return name + "`" + count;
 122                 }
 123
 124                 public string GetTypeName ()
 125                 {
 126                         string suffix = "";
 127                         if (Left != null)
 128                                 return Left.GetTypeName () + "." +
 129                                         MakeName (Name, TypeArguments);
 130                         else
 131                                 return MakeName (Name, TypeArguments);
 132                 }
 133
 134                 protected bool IsUnbound {
 135                         get {
 136                                 if ((Left != null) && Left.IsUnbound)
 137                                         return true;
 138                                 else if (TypeArguments == null)
 139                                         return false;
 140                                 else
 141                                         return TypeArguments.IsUnbound;
 142                         }
 143                 }
 144
 145                 protected bool CheckUnbound (Location loc)
 146                 {
 147                         if ((Left != null) && !Left.CheckUnbound (loc))
 148                                 return false;
 149                         if ((TypeArguments != null) && !TypeArguments.IsUnbound) {
 150                                 Report.Error (1031, loc, "Type expected");
 151                                 return false;
 152                         }
 153
 154                         return true;
 155                 }
 156
 157                 public Expression GetTypeExpression (Location loc)
 158                 {
 159                         if (IsUnbound) {
 160                                 if (!CheckUnbound (loc))
 161                                         return null;
 162
 163                                 return new UnboundTypeExpression (GetTypeName ());
 164                         }
 165
 166                         if (Left != null) {
 167                                 Expression lexpr = Left.GetTypeExpression (loc);
 168
 169                                 return new MemberAccess (lexpr, Name, TypeArguments, loc);
 170                         } else {
 171                                 if (TypeArguments != null)
 172                                         return new ConstructedType (Name, TypeArguments, loc);
 173                                 else
 174                                         return new SimpleName (Name, loc);
 175                         }
 176                 }
 177
 178                 public MemberName Clone ()
 179                 {
 180                         if (Left != null)
 181                                 return new MemberName (Left.Clone (), Name, TypeArguments);
 182                         else
 183                                 return new MemberName (Name, TypeArguments);
 184                 }
 185
 186                 public string Basename {
 187                         get {
 188                                 if (TypeArguments != null)
 189                                         return MakeName (Name, TypeArguments);
 190                                 else
 191                                         return Name;
 192                         }
 193                 }
 194
 195                 public override string ToString ()
 196                 {
 197                         string full_name;
 198                         if (TypeArguments != null)
 199                                 full_name = Name + "<" + TypeArguments + ">";
 200                         else
 201                                 full_name = Name;
 202
 203                         if (Left != null)
 204                                 return Left + "." + full_name;
 205                         else
 206                                 return full_name;
 207                 }
 208         }
 209
 210         /// <summary>
 211         ///   Base representation for members.  This is used to keep track
 212         ///   of Name, Location and Modifier flags, and handling Attributes.
 213         /// </summary>
 214         public abstract class MemberCore : Attributable {
 215                 /// <summary>
 216                 ///   Public name
 217                 /// </summary>
 218                 public string Name {
 219                         get {
 220                                 return MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 221                         }
 222                 }
 223
 224                 public readonly MemberName MemberName;
 225
 226                 /// <summary>
 227                 ///   Modifier flags that the user specified in the source code
 228                 /// </summary>
 229                 public int ModFlags;
 230
 231                 public readonly TypeContainer Parent;
 232
 233                 /// <summary>
 234                 ///   Location where this declaration happens
 235                 /// </summary>
 236                 public readonly Location Location;
 237
 238                 [Flags]
 239                 public enum Flags {
 240                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 241                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 242                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 243                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 244                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 245                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 246                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 247                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 248                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 249                         Excluded = 1 << 9,                                      // Method is conditional
 250                         TestMethodDuplication = 1 << 10         // Test for duplication must be performed
 251                 }
 252
 253                 /// <summary>
 254                 ///   MemberCore flags at first detected then cached
 255                 /// </summary>
 256                 internal Flags caching_flags;
 257
 258                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs,
 259                                    Location loc)
 260                         : base (attrs)
 261                 {
 262                         Parent = parent;
 263                         MemberName = name;
 264                         Location = loc;
 265                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 266                 }
 267
 268                 /// <summary>
 269                 /// Tests presence of ObsoleteAttribute and report proper error
 270                 /// </summary>
 271                 protected void CheckUsageOfObsoleteAttribute (Type type)
 272                 {
 273                         if (type == null)
 274                                 return;
 275
 276                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
 277                         if (obsolete_attr == null)
 278                                 return;
 279
 280                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
 281                 }
 282
 283                 public abstract bool Define ();
 284
 285                 //
 286                 // Returns full member name for error message
 287                 //
 288                 public virtual string GetSignatureForError ()
 289                 {
 290                         return Name;
 291                 }
 292
 293                 /// <summary>
 294                 /// Use this method when MethodBuilder is null
 295                 /// </summary>
 296                 public virtual string GetSignatureForError (TypeContainer tc)
 297                 {
 298                         return Name;
 299                 }
 300
 301                 /// <summary>
 302                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 303                 /// </summary>
 304                 public virtual void Emit ()
 305                 {
 306                         VerifyObsoleteAttribute ();
 307
 308                         if (!RootContext.VerifyClsCompliance)
 309                                 return;
 310
 311                         VerifyClsCompliance (Parent);
 312                 }
 313
 314                 //
 315                 // Whehter is it ok to use an unsafe pointer in this type container
 316                 //
 317                 public bool UnsafeOK (DeclSpace parent)
 318                 {
 319                         //
 320                         // First check if this MemberCore modifier flags has unsafe set
 321                         //
 322                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 323                                 return true;
 324
 325                         if (parent.UnsafeContext)
 326                                 return true;
 327
 328                         Expression.UnsafeError (Location);
 329                         return false;
 330                 }
 331
 332                 /// <summary>
 333                 /// Returns instance of ObsoleteAttribute for this MemberCore
 334                 /// </summary>
 335                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 336                 {
 337                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 338                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 339                                 return null;
 340                         }
 341
 342                         caching_flags &= ~Flags.Obsolete_Undetected;
 343
 344                         if (OptAttributes == null)
 345                                 return null;
 346
 347                         // TODO: remove this allocation
 348                         EmitContext ec = new EmitContext (ds.Parent, ds, ds.Location,
 349                                 null, null, ds.ModFlags, false);
 350
 351                         Attribute obsolete_attr = OptAttributes.Search (TypeManager.obsolete_attribute_type, ec);
 352                         if (obsolete_attr == null)
 353                                 return null;
 354
 355                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds);
 356                         if (obsolete == null)
 357                                 return null;
 358
 359                         caching_flags |= Flags.Obsolete;
 360                         return obsolete;
 361                 }
 362
 363                 /// <summary>
 364                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 365                 /// </summary>
 366                 public override bool IsClsCompliaceRequired (DeclSpace container)
 367                 {
 368                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 369                                 return (caching_flags & Flags.ClsCompliant) != 0;
 370
 371                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 372                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 373                                 caching_flags |= Flags.ClsCompliant;
 374                                 return true;
 375                         }
 376
 377                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 378                         return false;
 379                 }
 380
 381                 /// <summary>
 382                 /// Returns true when MemberCore is exposed from assembly.
 383                 /// </summary>
 384                 protected bool IsExposedFromAssembly (DeclSpace ds)
 385                 {
 386                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 387                                 return false;
 388
 389                         DeclSpace parentContainer = ds;
 390                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 391                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 392                                         return false;
 393                                 parentContainer = parentContainer.Parent;
 394                         }
 395                         return true;
 396                 }
 397
 398                 /// <summary>
 399                 /// Resolve CLSCompliantAttribute value or gets cached value.
 400                 /// </summary>
 401                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 402                 {
 403                         if (OptAttributes != null) {
 404                                 EmitContext ec = new EmitContext (ds.Parent, ds, ds.Location,
 405                                                                   null, null, ds.ModFlags, false);
 406                                 Attribute cls_attribute = OptAttributes.GetClsCompliantAttribute (ec);
 407                                 if (cls_attribute != null) {
 408                                         caching_flags |= Flags.HasClsCompliantAttribute;
 409                                         return cls_attribute.GetClsCompliantAttributeValue (ds);
 410                                 }
 411                         }
 412                         return ds.GetClsCompliantAttributeValue ();
 413                 }
 414
 415                 /// <summary>
 416                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 417                 /// </summary>
 418                 protected bool HasClsCompliantAttribute {
 419                         get {
 420                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 421                         }
 422                 }
 423
 424                 /// <summary>
 425                 /// The main virtual method for CLS-Compliant verifications.
 426                 /// The method returns true if member is CLS-Compliant and false if member is not
 427                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 428                 /// and add their extra verifications.
 429                 /// </summary>
 430                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 431                 {
 432                         if (!IsClsCompliaceRequired (ds)) {
 433                                 if ((RootContext.WarningLevel >= 2) && HasClsCompliantAttribute && !IsExposedFromAssembly (ds)) {
 434                                         Report.Warning (3019, Location, "CLS compliance checking will not be performed on '{0}' because it is private or internal", GetSignatureForError ());
 435                                 }
 436                                 return false;
 437                         }
 438
 439                         if (!CodeGen.Assembly.IsClsCompliant) {
 440                                 if (HasClsCompliantAttribute) {
 441                                         Report.Error (3014, Location, "'{0}' cannot be marked as CLS-compliant because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 442                                 }
 443                                 return false;
 444                         }
 445
 446                         int index = Name.LastIndexOf ('.');
 447                         if (Name [index > 0 ? index + 1 : 0] == '_') {
 448                                 Report.Error (3008, Location, "Identifier '{0}' is not CLS-compliant", GetSignatureForError () );
 449                         }
 450                         return true;
 451                 }
 452
 453                 protected abstract void VerifyObsoleteAttribute ();
 454
 455         }
 456
 457         /// <summary>
 458         ///   Base class for structs, classes, enumerations and interfaces.
 459         /// </summary>
 460         /// <remarks>
 461         ///   They all create new declaration spaces.  This
 462         ///   provides the common foundation for managing those name
 463         ///   spaces.
 464         /// </remarks>
 465         public abstract class DeclSpace : MemberCore, IAlias {
 466                 /// <summary>
 467                 ///   This points to the actual definition that is being
 468                 ///   created with System.Reflection.Emit
 469                 /// </summary>
 470                 public TypeBuilder TypeBuilder;
 471
 472                 /// <summary>
 473                 ///   If we are a generic type, this is the type we are
 474                 ///   currently defining.  We need to lookup members on this
 475                 ///   instead of the TypeBuilder.
 476                 /// </summary>
 477                 public TypeExpr CurrentType;
 478
 479                 //
 480                 // This is the namespace in which this typecontainer
 481                 // was declared.  We use this to resolve names.
 482                 //
 483                 public NamespaceEntry NamespaceEntry;
 484
 485                 public Hashtable Cache = new Hashtable ();
 486
 487                 public string Basename;
 488
 489                 protected Hashtable defined_names;
 490
 491                 readonly bool is_generic;
 492                 readonly int count_type_params;
 493
 494                 //
 495                 // Whether we are Generic
 496                 //
 497                 public bool IsGeneric {
 498                         get {
 499                                 if (is_generic)
 500                                         return true;
 501                                 else if (Parent != null)
 502                                         return Parent.IsGeneric;
 503                                 else
 504                                         return false;
 505                         }
 506                 }
 507
 508                 static string[] attribute_targets = new string [] { "type" };
 509
 510                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 511                                   Attributes attrs, Location l)
 512                         : base (parent, name, attrs, l)
 513                 {
 514                         NamespaceEntry = ns;
 515                         Basename = name.Name;
 516                         defined_names = new Hashtable ();
 517                         if (name.TypeArguments != null) {
 518                                 is_generic = true;
 519                                 count_type_params = name.TypeArguments.Count;
 520                         }
 521                         if (parent != null)
 522                                 count_type_params += parent.count_type_params;
 523                 }
 524
 525                 /// <summary>
 526                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 527                 /// </summary>
 528                 protected bool AddToContainer (MemberCore symbol, bool is_method, string fullname, string basename)
 529                 {
 530                         if (basename == Basename) {
 531                                 Report.SymbolRelatedToPreviousError (this);
 532                                 Report.Error (542, "'{0}': member names cannot be the same as their enclosing type", symbol.Location, symbol.GetSignatureForError ());
 533                                 return false;
 534                         }
 535
 536                         MemberCore mc = (MemberCore)defined_names [fullname];
 537
 538                         if (is_method && (mc is MethodCore || mc is IMethodData)) {
 539                                 symbol.caching_flags |= Flags.TestMethodDuplication;
 540                                 mc.caching_flags |= Flags.TestMethodDuplication;
 541                                 return true;
 542                         }
 543
 544                         if (mc != null) {
 545                                 Report.SymbolRelatedToPreviousError (mc);
 546                                 Report.Error (102, symbol.Location, "The type '{0}' already contains a definition for '{1}'", GetSignatureForError (), basename);
 547                                 return false;
 548                         }
 549
 550                         defined_names.Add (fullname, symbol);
 551                         return true;
 552                 }
 553
 554                 public void RecordDecl ()
 555                 {
 556                         if ((NamespaceEntry != null) && (Parent == RootContext.Tree.Types))
 557                                 NamespaceEntry.DefineName (MemberName.Basename, this);
 558                 }
 559
 560                 /// <summary>
 561                 ///   Returns the MemberCore associated with a given name in the declaration
 562                 ///   space. It doesn't return method based symbols !!
 563                 /// </summary>
 564                 ///
 565                 public MemberCore GetDefinition (string name)
 566                 {
 567                         return (MemberCore)defined_names [name];
 568                 }
 569
 570                 bool in_transit = false;
 571
 572                 /// <summary>
 573                 ///   This function is used to catch recursive definitions
 574                 ///   in declarations.
 575                 /// </summary>
 576                 public bool InTransit {
 577                         get {
 578                                 return in_transit;
 579                         }
 580
 581                         set {
 582                                 in_transit = value;
 583                         }
 584                 }
 585
 586                 /// <summary>
 587                 ///   Looks up the alias for the name
 588                 /// </summary>
 589                 public IAlias LookupAlias (string name)
 590                 {
 591                         if (NamespaceEntry != null)
 592                                 return NamespaceEntry.LookupAlias (name);
 593                         else
 594                                 return null;
 595                 }
 596
 597                 //
 598                 // root_types contains all the types.  All TopLevel types
 599                 // hence have a parent that points to `root_types', that is
 600                 // why there is a non-obvious test down here.
 601                 //
 602                 public bool IsTopLevel {
 603                         get {
 604                                 if (Parent != null){
 605                                         if (Parent.Parent == null)
 606                                                 return true;
 607                                 }
 608                                 return false;
 609                         }
 610                 }
 611
 612                 public virtual void CloseType ()
 613                 {
 614                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 615                                 try {
 616                                         TypeBuilder.CreateType ();
 617                                 } catch {
 618                                         //
 619                                         // The try/catch is needed because
 620                                         // nested enumerations fail to load when they
 621                                         // are defined.
 622                                         //
 623                                         // Even if this is the right order (enumerations
 624                                         // declared after types).
 625                                         //
 626                                         // Note that this still creates the type and
 627                                         // it is possible to save it
 628                                 }
 629                                 caching_flags |= Flags.CloseTypeCreated;
 630                         }
 631                 }
 632
 633                 /// <remarks>
 634                 ///  Should be overriten by the appropriate declaration space
 635                 /// </remarks>
 636                 public abstract TypeBuilder DefineType ();
 637
 638                 /// <summary>
 639                 ///   Define all members, but don't apply any attributes or do anything which may
 640                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 641                 /// </summary>
 642                 public abstract bool DefineMembers (TypeContainer parent);
 643
 644                 //
 645                 // Whether this is an `unsafe context'
 646                 //
 647                 public bool UnsafeContext {
 648                         get {
 649                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 650                                         return true;
 651                                 if (Parent != null)
 652                                         return Parent.UnsafeContext;
 653                                 return false;
 654                         }
 655                 }
 656
 657                 public static string MakeFQN (string nsn, string name)
 658                 {
 659                         if (nsn == "")
 660                                 return name;
 661                         return String.Concat (nsn, ".", name);
 662                 }
 663
 664                 EmitContext type_resolve_ec;
 665                 EmitContext GetTypeResolveEmitContext (TypeContainer parent, Location loc)
 666                 {
 667                         type_resolve_ec = new EmitContext (parent, this, loc, null, null, ModFlags, false);
 668                         type_resolve_ec.ResolvingTypeTree = true;
 669
 670                         return type_resolve_ec;
 671                 }
 672
 673                 // <summary>
 674                 //    Looks up the type, as parsed into the expression `e'
 675                 // </summary>
 676                 public Type ResolveType (Expression e, bool silent, Location loc)
 677                 {
 678                         TypeExpr d = ResolveTypeExpr (e, silent, loc);
 679                         if (d == null)
 680                                 return null;
 681
 682                         return ResolveType (d, loc);
 683                 }
 684
 685                 public Type ResolveType (TypeExpr d, Location loc)
 686                 {
 687                         if (!d.CheckAccessLevel (this)) {
 688                                 Report.Error (122, loc, "'{0}' is inaccessible due to its protection level", d.Name);
 689                                 return null;
 690                         }
 691
 692                         Type t = d.ResolveType (type_resolve_ec);
 693                         if (t == null)
 694                                 return null;
 695
 696                         if (d is UnboundTypeExpression)
 697                                 return t;
 698
 699                         TypeContainer tc = TypeManager.LookupTypeContainer (t);
 700                         if ((tc != null) && tc.IsGeneric) {
 701                                 if (!IsGeneric) {
 702                                         int tnum = TypeManager.GetNumberOfTypeArguments (t);
 703                                         Report.Error (305, loc,
 704                                                       "Using the generic type `{0}' " +
 705                                                       "requires {1} type arguments",
 706                                                       TypeManager.GetFullName (t), tnum);
 707                                         return null;
 708                                 }
 709
 710                                 ConstructedType ctype = new ConstructedType (
 711                                         t, TypeParameters, loc);
 712
 713                                 t = ctype.ResolveType (type_resolve_ec);
 714                         }
 715
 716                         return t;
 717                 }
 718
 719                 // <summary>
 720                 //    Resolves the expression `e' for a type, and will recursively define
 721                 //    types.
 722                 // </summary>
 723                 public TypeExpr ResolveTypeExpr (Expression e, bool silent, Location loc)
 724                 {
 725                         if (type_resolve_ec == null)
 726                                 type_resolve_ec = GetTypeResolveEmitContext (Parent, loc);
 727                         type_resolve_ec.loc = loc;
 728                         if (this is GenericMethod)
 729                                 type_resolve_ec.ContainerType = Parent.TypeBuilder;
 730                         else
 731                                 type_resolve_ec.ContainerType = TypeBuilder;
 732
 733                         int errors = Report.Errors;
 734
 735                         TypeExpr d = e.ResolveAsTypeTerminal (type_resolve_ec, silent);
 736
 737                         if ((d != null) && (d.eclass == ExprClass.Type))
 738                                 return d;
 739
 740                         if (silent || (Report.Errors != errors))
 741                                 return null;
 742
 743                         if (e is SimpleName){
 744                                 SimpleName s = new SimpleName (((SimpleName) e).Name, loc);
 745                                 d = s.ResolveAsTypeTerminal (type_resolve_ec, silent);
 746
 747                                 if ((d == null) || (d.Type == null)) {
 748                                         Report.Error (246, loc, "Cannot find type `{0}'", e);
 749                                         return null;
 750                                 }
 751
 752                                 int num_args = TypeManager.GetNumberOfTypeArguments (d.Type);
 753
 754                                 if (num_args == 0) {
 755                                         Report.Error (308, loc,
 756                                                       "The non-generic type `{0}' cannot " +
 757                                                       "be used with type arguments.",
 758                                                       TypeManager.CSharpName (d.Type));
 759                                         return null;
 760                                 }
 761
 762                                 Report.Error (305, loc,
 763                                               "Using the generic type `{0}' " +
 764                                               "requires {1} type arguments",
 765                                               TypeManager.GetFullName (d.Type), num_args);
 766                                 return null;
 767                         }
 768
 769                         Report.Error (246, loc, "Cannot find type `{0}'", e);
 770                         return null;
 771                 }
 772
 773                 public bool CheckAccessLevel (Type check_type)
 774                 {
 775                         TypeBuilder tb;
 776                         if (this is GenericMethod)
 777                                 tb = Parent.TypeBuilder;
 778                         else
 779                                 tb = TypeBuilder;
 780
 781                         if (check_type.IsGenericInstance)
 782                                 check_type = check_type.GetGenericTypeDefinition ();
 783
 784                         if (check_type == tb)
 785                                 return true;
 786
 787                         if (check_type.IsGenericParameter)
 788                                 return true; // FIXME
 789
 790                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 791
 792                         //
 793                         // Broken Microsoft runtime, return public for arrays, no matter what
 794                         // the accessibility is for their underlying class, and they return
 795                         // NonPublic visibility for pointers
 796                         //
 797                         if (check_type.IsArray || check_type.IsPointer)
 798                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 799
 800                         switch (check_attr){
 801                         case TypeAttributes.Public:
 802                                 return true;
 803
 804                         case TypeAttributes.NotPublic:
 805
 806                                 if (TypeBuilder == null)
 807                                         // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 808                                         //        However, this is invoked again later -- so safe to return true.
 809                                         //        May also be null when resolving top-level attributes.
 810                                         return true;
 811
 812                                 //
 813                                 // This test should probably use the declaringtype.
 814                                 //
 815                                 return check_type.Assembly == TypeBuilder.Assembly;
 816
 817                         case TypeAttributes.NestedPublic:
 818                                 return true;
 819
 820                         case TypeAttributes.NestedPrivate:
 821                                 return NestedAccessible (check_type);
 822
 823                         case TypeAttributes.NestedFamily:
 824                                 //
 825                                 // Only accessible to methods in current type or any subtypes
 826                                 //
 827                                 return FamilyAccessible (check_type);
 828
 829                         case TypeAttributes.NestedFamANDAssem:
 830                                 return (check_type.Assembly == tb.Assembly) &&
 831                                         FamilyAccessible (check_type);
 832
 833                         case TypeAttributes.NestedFamORAssem:
 834                                 return (check_type.Assembly == tb.Assembly) ||
 835                                         FamilyAccessible (check_type);
 836
 837                         case TypeAttributes.NestedAssembly:
 838                                 return check_type.Assembly == tb.Assembly;
 839                         }
 840
 841                         Console.WriteLine ("HERE: " + check_attr);
 842                         return false;
 843
 844                 }
 845
 846                 protected bool NestedAccessible (Type check_type)
 847                 {
 848                         string check_type_name = check_type.FullName;
 849
 850                         // At this point, we already know check_type is a nested class.
 851                         int cio = check_type_name.LastIndexOf ('+');
 852
 853                         // Ensure that the string 'container' has a '+' in it to avoid false matches
 854                         string container = check_type_name.Substring (0, cio + 1);
 855
 856                         // Ensure that type_name ends with a '+' so that it can match 'container', if necessary
 857                         string type_name = TypeBuilder.FullName + "+";
 858
 859                         // If the current class is nested inside the container of check_type,
 860                         // we can access check_type even if it is private or protected.
 861                         return type_name.StartsWith (container);
 862                 }
 863
 864                 protected bool FamilyAccessible (Type check_type)
 865                 {
 866                         Type declaring = check_type.DeclaringType;
 867                         if (TypeBuilder == declaring ||
 868                             TypeBuilder.IsSubclassOf (declaring))
 869                                 return true;
 870
 871                         return NestedAccessible (check_type);
 872                 }
 873
 874                 // Access level of a type.
 875                 const int X = 1;
 876                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 877                         // Public    Assembly   Protected
 878                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 879                         Public              = (X << 0) | (X << 1) | (X << 2),
 880                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 881                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 882                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 883                 }
 884
 885                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 886                 {
 887                         if ((flags & Modifiers.INTERNAL) != 0) {
 888
 889                                 if ((flags & Modifiers.PROTECTED) != 0)
 890                                         return AccessLevel.ProtectedOrInternal;
 891                                 else
 892                                         return AccessLevel.Internal;
 893
 894                         } else if ((flags & Modifiers.PROTECTED) != 0)
 895                                 return AccessLevel.Protected;
 896                         else if ((flags & Modifiers.PRIVATE) != 0)
 897                                 return AccessLevel.Private;
 898                         else
 899                                 return AccessLevel.Public;
 900                 }
 901
 902                 // What is the effective access level of this?
 903                 // TODO: Cache this?
 904                 AccessLevel EffectiveAccessLevel {
 905                         get {
 906                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 907                                 if (!IsTopLevel && (Parent != null))
 908                                         return myAccess & Parent.EffectiveAccessLevel;
 909                                 return myAccess;
 910                         }
 911                 }
 912
 913                 // Return the access level for type `t'
 914                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 915                 {
 916                         if (t.IsPublic)
 917                                 return AccessLevel.Public;
 918                         if (t.IsNestedPrivate)
 919                                 return AccessLevel.Private;
 920                         if (t.IsNotPublic)
 921                                 return AccessLevel.Internal;
 922
 923                         // By now, it must be nested
 924                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
 925
 926                         if (t.IsNestedPublic)
 927                                 return parentLevel;
 928                         if (t.IsNestedAssembly)
 929                                 return parentLevel & AccessLevel.Internal;
 930                         if (t.IsNestedFamily)
 931                                 return parentLevel & AccessLevel.Protected;
 932                         if (t.IsNestedFamORAssem)
 933                                 return parentLevel & AccessLevel.ProtectedOrInternal;
 934                         if (t.IsNestedFamANDAssem)
 935                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 936
 937                         // nested private is taken care of
 938
 939                         throw new Exception ("I give up, what are you?");
 940                 }
 941
 942                 //
 943                 // This answers `is the type P, as accessible as a member M which has the
 944                 // accessability @flags which is declared as a nested member of the type T, this declspace'
 945                 //
 946                 public bool AsAccessible (Type p, int flags)
 947                 {
 948                         if (p.IsGenericParameter)
 949                                 return true; // FIXME
 950
 951                         //
 952                         // 1) if M is private, its accessability is the same as this declspace.
 953                         // we already know that P is accessible to T before this method, so we
 954                         // may return true.
 955                         //
 956
 957                         if ((flags & Modifiers.PRIVATE) != 0)
 958                                 return true;
 959
 960                         while (p.IsArray || p.IsPointer || p.IsByRef)
 961                                 p = TypeManager.GetElementType (p);
 962
 963                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
 964                         AccessLevel mAccess = this.EffectiveAccessLevel &
 965                                 GetAccessLevelFromModifiers (flags);
 966
 967                         // for every place from which we can access M, we must
 968                         // be able to access P as well. So, we want
 969                         // For every bit in M and P, M_i -> P_1 == true
 970                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
 971
 972                         return ~ (~ mAccess | pAccess) == 0;
 973                 }
 974
 975                 static DoubleHash dh = new DoubleHash (1000);
 976
 977                 Type DefineTypeAndParents (DeclSpace tc)
 978                 {
 979                         DeclSpace container = tc.Parent;
 980
 981                         if (container.TypeBuilder == null && container.Name != "")
 982                                 DefineTypeAndParents (container);
 983
 984                         return tc.DefineType ();
 985                 }
 986
 987                 Type LookupInterfaceOrClass (string ns, string name, out bool error)
 988                 {
 989                         DeclSpace parent;
 990                         Type t;
 991                         object r;
 992
 993                         error = false;
 994
 995                         if (dh.Lookup (ns, name, out r))
 996                                 return (Type) r;
 997                         else {
 998                                 if (ns != ""){
 999                                         if (Namespace.IsNamespace (ns)){
1000                                                 string fullname = (ns != "") ? ns + "." + name : name;
1001                                                 t = TypeManager.LookupType (fullname);
1002                                         } else
1003                                                 t = null;
1004                                 } else
1005                                         t = TypeManager.LookupType (name);
1006                         }
1007
1008                         if (t != null) {
1009                                 dh.Insert (ns, name, t);
1010                                 return t;
1011                         }
1012
1013                         //
1014                         // In case we are fed a composite name, normalize it.
1015                         //
1016                         int p = name.LastIndexOf ('.');
1017                         if (p != -1){
1018                                 ns = MakeFQN (ns, name.Substring (0, p));
1019                                 name = name.Substring (p+1);
1020                         }
1021
1022                         parent = RootContext.Tree.LookupByNamespace (ns, name);
1023                         if (parent == null) {
1024                                 dh.Insert (ns, name, null);
1025                                 return null;
1026                         }
1027
1028                         t = DefineTypeAndParents (parent);
1029                         if (t == null){
1030                                 error = true;
1031                                 return null;
1032                         }
1033
1034                         dh.Insert (ns, name, t);
1035                         return t;
1036                 }
1037
1038                 public static void Error_AmbiguousTypeReference (Location loc, string name, string t1, string t2)
1039                 {
1040                         Report.Error (104, loc,
1041                                       "`{0}' is an ambiguous reference ({1} or {2})",
1042                                       name, t1, t2);
1043                 }
1044
1045                 public Type FindNestedType (Location loc, string name,
1046                                             out DeclSpace containing_ds)
1047                 {
1048                         Type t;
1049                         bool error;
1050
1051                         containing_ds = this;
1052                         while (containing_ds != null){
1053                                 Type container_type = containing_ds.TypeBuilder;
1054                                 Type current_type = container_type;
1055
1056                                 while (current_type != null && current_type != TypeManager.object_type) {
1057                                         string pre = current_type.FullName;
1058
1059                                         t = LookupInterfaceOrClass (pre, name, out error);
1060                                         if (error)
1061                                                 return null;
1062
1063                                         if ((t != null) && containing_ds.CheckAccessLevel (t))
1064                                                 return t;
1065
1066                                         current_type = current_type.BaseType;
1067                                 }
1068                                 containing_ds = containing_ds.Parent;
1069                         }
1070
1071                         return null;
1072                 }
1073
1074                 /// <summary>
1075                 ///   GetType is used to resolve type names at the DeclSpace level.
1076                 ///   Use this to lookup class/struct bases, interface bases or
1077                 ///   delegate type references
1078                 /// </summary>
1079                 ///
1080                 /// <remarks>
1081                 ///   Contrast this to LookupType which is used inside method bodies to
1082                 ///   lookup types that have already been defined.  GetType is used
1083                 ///   during the tree resolution process and potentially define
1084                 ///   recursively the type
1085                 /// </remarks>
1086                 public Type FindType (Location loc, string name)
1087                 {
1088                         Type t;
1089                         bool error;
1090
1091                         //
1092                         // For the case the type we are looking for is nested within this one
1093                         // or is in any base class
1094                         //
1095                         DeclSpace containing_ds = this;
1096
1097                         while (containing_ds != null){
1098                                 Type container_type = containing_ds.TypeBuilder;
1099                                 Type current_type = container_type;
1100
1101                                 while (current_type != null && current_type != TypeManager.object_type) {
1102                                         string pre = current_type.FullName;
1103
1104                                         t = LookupInterfaceOrClass (pre, name, out error);
1105                                         if (error)
1106                                                 return null;
1107
1108                                         if ((t != null) && containing_ds.CheckAccessLevel (t))
1109                                                 return t;
1110
1111                                         current_type = current_type.BaseType;
1112                                 }
1113                                 containing_ds = containing_ds.Parent;
1114                         }
1115
1116                         //
1117                         // Attempt to lookup the class on our namespace and all it's implicit parents
1118                         //
1119                         for (NamespaceEntry ns = NamespaceEntry; ns != null; ns = ns.ImplicitParent) {
1120                                 t = LookupInterfaceOrClass (ns.FullName, name, out error);
1121                                 if (error)
1122                                         return null;
1123
1124                                 if (t != null)
1125                                         return t;
1126                         }
1127
1128                         //
1129                         // Attempt to do a direct unqualified lookup
1130                         //
1131                         t = LookupInterfaceOrClass ("", name, out error);
1132                         if (error)
1133                                 return null;
1134
1135                         if (t != null)
1136                                 return t;
1137
1138                         //
1139                         // Attempt to lookup the class on any of the `using'
1140                         // namespaces
1141                         //
1142
1143                         for (NamespaceEntry ns = NamespaceEntry; ns != null; ns = ns.Parent){
1144
1145                                 t = LookupInterfaceOrClass (ns.FullName, name, out error);
1146                                 if (error)
1147                                         return null;
1148
1149                                 if (t != null)
1150                                         return t;
1151
1152                                 if (name.IndexOf ('.') > 0)
1153                                         continue;
1154
1155                                 IAlias alias_value = ns.LookupAlias (name);
1156                                 if (alias_value != null) {
1157                                         t = LookupInterfaceOrClass ("", alias_value.Name, out error);
1158                                         if (error)
1159                                                 return null;
1160
1161                                         if (t != null)
1162                                                 return t;
1163                                 }
1164
1165                                 //
1166                                 // Now check the using clause list
1167                                 //
1168                                 Type match = null;
1169                                 foreach (Namespace using_ns in ns.GetUsingTable ()) {
1170                                         match = LookupInterfaceOrClass (using_ns.Name, name, out error);
1171                                         if (error)
1172                                                 return null;
1173
1174                                         if (match != null) {
1175                                                 if (t != null){
1176                                                         if (CheckAccessLevel (match)) {
1177                                                                 Error_AmbiguousTypeReference (loc, name, t.FullName, match.FullName);
1178                                                                 return null;
1179                                                         }
1180                                                         continue;
1181                                                 }
1182
1183                                                 t = match;
1184                                         }
1185                                 }
1186                                 if (t != null)
1187                                         return t;
1188                         }
1189
1190                         //Report.Error (246, Location, "Can not find type `"+name+"'");
1191                         return null;
1192                 }
1193
1194                 /// <remarks>
1195                 ///   This function is broken and not what you're looking for.  It should only
1196                 ///   be used while the type is still being created since it doesn't use the cache
1197                 ///   and relies on the filter doing the member name check.
1198                 /// </remarks>
1199                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1200                                                         MemberFilter filter, object criteria);
1201
1202                 /// <remarks>
1203                 ///   If we have a MemberCache, return it.  This property may return null if the
1204                 ///   class doesn't have a member cache or while it's still being created.
1205                 /// </remarks>
1206                 public abstract MemberCache MemberCache {
1207                         get;
1208                 }
1209
1210                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1211                 {
1212                         try {
1213                                 TypeBuilder.SetCustomAttribute (cb);
1214                         } catch (System.ArgumentException e) {
1215                                 Report.Warning (-21, a.Location,
1216                                                 "The CharSet named property on StructLayout\n"+
1217                                                 "\tdoes not work correctly on Microsoft.NET\n"+
1218                                                 "\tYou might want to remove the CharSet declaration\n"+
1219                                                 "\tor compile using the Mono runtime instead of the\n"+
1220                                                 "\tMicrosoft .NET runtime\n"+
1221                                                 "\tThe runtime gave the error: " + e);
1222                         }
1223                 }
1224
1225                 /// <summary>
1226                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
1227                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
1228                 /// </summary>
1229                 public bool GetClsCompliantAttributeValue ()
1230                 {
1231                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
1232                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
1233
1234                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
1235
1236                         if (OptAttributes != null) {
1237                                 EmitContext ec = new EmitContext (Parent, this, Location,
1238                                                                   null, null, ModFlags, false);
1239                                 Attribute cls_attribute = OptAttributes.GetClsCompliantAttribute (ec);
1240                                 if (cls_attribute != null) {
1241                                         caching_flags |= Flags.HasClsCompliantAttribute;
1242                                         if (cls_attribute.GetClsCompliantAttributeValue (this)) {
1243                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1244                                                 return true;
1245                                         }
1246                                         return false;
1247                                 }
1248                         }
1249
1250                         if (Parent == null) {
1251                                 if (CodeGen.Assembly.IsClsCompliant) {
1252                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
1253                                         return true;
1254                                 }
1255                                 return false;
1256                         }
1257
1258                         if (Parent.GetClsCompliantAttributeValue ()) {
1259                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1260                                 return true;
1261                         }
1262                         return false;
1263                 }
1264
1265                 //
1266                 // Extensions for generics
1267                 //
1268                 TypeParameter[] type_params;
1269                 TypeParameter[] type_param_list;
1270
1271                 protected string GetInstantiationName ()
1272                 {
1273                         StringBuilder sb = new StringBuilder (Name);
1274                         sb.Append ("<");
1275                         for (int i = 0; i < type_param_list.Length; i++) {
1276                                 if (i > 0)
1277                                         sb.Append (",");
1278                                 sb.Append (type_param_list [i].Name);
1279                         }
1280                         sb.Append (">");
1281                         return sb.ToString ();
1282                 }
1283
1284                 bool check_type_parameter (ArrayList list, int start, string name)
1285                 {
1286                         for (int i = 0; i < start; i++) {
1287                                 TypeParameter param = (TypeParameter) list [i];
1288
1289                                 if (param.Name != name)
1290                                         continue;
1291
1292                                 if (RootContext.WarningLevel >= 3)
1293                                         Report.Warning (
1294                                                 693, Location,
1295                                                 "Type parameter `{0}' has same name " +
1296                                                 "as type parameter from outer type `{1}'",
1297                                                 name, Parent.GetInstantiationName ());
1298
1299                                 return false;
1300                         }
1301
1302                         return true;
1303                 }
1304
1305                 TypeParameter[] initialize_type_params ()
1306                 {
1307                         if (type_param_list != null)
1308                                 return type_param_list;
1309
1310                         DeclSpace the_parent = Parent;
1311                         if (this is GenericMethod)
1312                                 the_parent = null;
1313
1314                         int start = 0;
1315                         TypeParameter[] parent_params = null;
1316                         if ((the_parent != null) && the_parent.IsGeneric) {
1317                                 parent_params = the_parent.initialize_type_params ();
1318                                 start = parent_params != null ? parent_params.Length : 0;
1319                         }
1320
1321                         ArrayList list = new ArrayList ();
1322                         if (parent_params != null)
1323                                 list.AddRange (parent_params);
1324
1325                         int count = type_params != null ? type_params.Length : 0;
1326                         for (int i = 0; i < count; i++) {
1327                                 TypeParameter param = type_params [i];
1328                                 check_type_parameter (list, start, param.Name);
1329                                 list.Add (param);
1330                         }
1331
1332                         type_param_list = new TypeParameter [list.Count];
1333                         list.CopyTo (type_param_list, 0);
1334                         return type_param_list;
1335                 }
1336
1337                 public void SetParameterInfo (ArrayList constraints_list)
1338                 {
1339                         if (!is_generic) {
1340                                 if (constraints_list != null) {
1341                                         Report.Error (
1342                                                 80, Location, "Contraints are not allowed " +
1343                                                 "on non-generic declarations");
1344                                 }
1345
1346                                 return;
1347                         }
1348
1349                         string[] names = MemberName.TypeArguments.GetDeclarations ();
1350                         type_params = new TypeParameter [names.Length];
1351
1352                         //
1353                         // Register all the names
1354                         //
1355                         for (int i = 0; i < type_params.Length; i++) {
1356                                 string name = names [i];
1357
1358                                 Constraints constraints = null;
1359                                 if (constraints_list != null) {
1360                                         foreach (Constraints constraint in constraints_list) {
1361                                                 if (constraint.TypeParameter == name) {
1362                                                         constraints = constraint;
1363                                                         break;
1364                                                 }
1365                                         }
1366                                 }
1367
1368                                 type_params [i] = new TypeParameter (Parent, name, constraints, Location);
1369
1370                                 string full_name = Name + "." + name;
1371                                 AddToContainer (type_params [i], false, full_name, name);
1372                         }
1373                 }
1374
1375                 public TypeParameter[] TypeParameters {
1376                         get {
1377                                 if (!IsGeneric)
1378                                         throw new InvalidOperationException ();
1379                                 if (type_param_list == null)
1380                                         initialize_type_params ();
1381
1382                                 return type_param_list;
1383                         }
1384                 }
1385
1386                 protected TypeParameter[] CurrentTypeParameters {
1387                         get {
1388                                 if (!IsGeneric)
1389                                         throw new InvalidOperationException ();
1390                                 if (type_params != null)
1391                                         return type_params;
1392                                 else
1393                                         return new TypeParameter [0];
1394                         }
1395                 }
1396
1397                 public int CountTypeParameters {
1398                         get {
1399                                 return count_type_params;
1400                         }
1401                 }
1402
1403                 public TypeParameterExpr LookupGeneric (string name, Location loc)
1404                 {
1405                         if (!IsGeneric)
1406                                 return null;
1407
1408                         foreach (TypeParameter type_param in CurrentTypeParameters) {
1409                                 if (type_param.Name != name)
1410                                         continue;
1411
1412                                 return new TypeParameterExpr (type_param, loc);
1413                         }
1414
1415                         if (Parent != null)
1416                                 return Parent.LookupGeneric (name, loc);
1417
1418                         return null;
1419                 }
1420
1421                 bool IAlias.IsType {
1422                         get { return true; }
1423                 }
1424
1425                 string IAlias.Name {
1426                         get { return Name; }
1427                 }
1428
1429                 TypeExpr IAlias.Type
1430                 {
1431                         get {
1432                                 if (TypeBuilder == null)
1433                                         throw new InvalidOperationException ();
1434
1435                                 if (CurrentType != null)
1436                                         return CurrentType;
1437
1438                                 return new TypeExpression (TypeBuilder, Location);
1439                         }
1440                 }
1441
1442                 public override string[] ValidAttributeTargets {
1443                         get {
1444                                 return attribute_targets;
1445                         }
1446                 }
1447         }
1448
1449         /// <summary>
1450         ///   This is a readonly list of MemberInfo's.
1451         /// </summary>
1452         public class MemberList : IList {
1453                 public readonly IList List;
1454                 int count;
1455
1456                 /// <summary>
1457                 ///   Create a new MemberList from the given IList.
1458                 /// </summary>
1459                 public MemberList (IList list)
1460                 {
1461                         if (list != null)
1462                                 this.List = list;
1463                         else
1464                                 this.List = new ArrayList ();
1465                         count = List.Count;
1466                 }
1467
1468                 /// <summary>
1469                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1470                 /// </summary>
1471                 public MemberList (IList first, IList second)
1472                 {
1473                         ArrayList list = new ArrayList ();
1474                         list.AddRange (first);
1475                         list.AddRange (second);
1476                         count = list.Count;
1477                         List = list;
1478                 }
1479
1480                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1481
1482                 /// <summary>
1483                 ///   Cast the MemberList into a MemberInfo[] array.
1484                 /// </summary>
1485                 /// <remarks>
1486                 ///   This is an expensive operation, only use it if it's really necessary.
1487                 /// </remarks>
1488                 public static explicit operator MemberInfo [] (MemberList list)
1489                 {
1490                         Timer.StartTimer (TimerType.MiscTimer);
1491                         MemberInfo [] result = new MemberInfo [list.Count];
1492                         list.CopyTo (result, 0);
1493                         Timer.StopTimer (TimerType.MiscTimer);
1494                         return result;
1495                 }
1496
1497                 // ICollection
1498
1499                 public int Count {
1500                         get {
1501                                 return count;
1502                         }
1503                 }
1504
1505                 public bool IsSynchronized {
1506                         get {
1507                                 return List.IsSynchronized;
1508                         }
1509                 }
1510
1511                 public object SyncRoot {
1512                         get {
1513                                 return List.SyncRoot;
1514                         }
1515                 }
1516
1517                 public void CopyTo (Array array, int index)
1518                 {
1519                         List.CopyTo (array, index);
1520                 }
1521
1522                 // IEnumerable
1523
1524                 public IEnumerator GetEnumerator ()
1525                 {
1526                         return List.GetEnumerator ();
1527                 }
1528
1529                 // IList
1530
1531                 public bool IsFixedSize {
1532                         get {
1533                                 return true;
1534                         }
1535                 }
1536
1537                 public bool IsReadOnly {
1538                         get {
1539                                 return true;
1540                         }
1541                 }
1542
1543                 object IList.this [int index] {
1544                         get {
1545                                 return List [index];
1546                         }
1547
1548                         set {
1549                                 throw new NotSupportedException ();
1550                         }
1551                 }
1552
1553                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1554                 public MemberInfo this [int index] {
1555                         get {
1556                                 return (MemberInfo) List [index];
1557                         }
1558                 }
1559
1560                 public int Add (object value)
1561                 {
1562                         throw new NotSupportedException ();
1563                 }
1564
1565                 public void Clear ()
1566                 {
1567                         throw new NotSupportedException ();
1568                 }
1569
1570                 public bool Contains (object value)
1571                 {
1572                         return List.Contains (value);
1573                 }
1574
1575                 public int IndexOf (object value)
1576                 {
1577                         return List.IndexOf (value);
1578                 }
1579
1580                 public void Insert (int index, object value)
1581                 {
1582                         throw new NotSupportedException ();
1583                 }
1584
1585                 public void Remove (object value)
1586                 {
1587                         throw new NotSupportedException ();
1588                 }
1589
1590                 public void RemoveAt (int index)
1591                 {
1592                         throw new NotSupportedException ();
1593                 }
1594         }
1595
1596         /// <summary>
1597         ///   This interface is used to get all members of a class when creating the
1598         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1599         ///   want to support the member cache and by TypeHandle to get caching of
1600         ///   non-dynamic types.
1601         /// </summary>
1602         public interface IMemberContainer {
1603                 /// <summary>
1604                 ///   The name of the IMemberContainer.  This is only used for
1605                 ///   debugging purposes.
1606                 /// </summary>
1607                 string Name {
1608                         get;
1609                 }
1610
1611                 /// <summary>
1612                 ///   The type of this IMemberContainer.
1613                 /// </summary>
1614                 Type Type {
1615                         get;
1616                 }
1617
1618                 /// <summary>
1619                 ///   Returns the IMemberContainer of the parent class or null if this
1620                 ///   is an interface or TypeManger.object_type.
1621                 ///   This is used when creating the member cache for a class to get all
1622                 ///   members from the parent class.
1623                 /// </summary>
1624                 IMemberContainer ParentContainer {
1625                         get;
1626                 }
1627
1628                 /// <summary>
1629                 ///   Whether this is an interface.
1630                 /// </summary>
1631                 bool IsInterface {
1632                         get;
1633                 }
1634
1635                 /// <summary>
1636                 ///   Returns all members of this class with the corresponding MemberTypes
1637                 ///   and BindingFlags.
1638                 /// </summary>
1639                 /// <remarks>
1640                 ///   When implementing this method, make sure not to return any inherited
1641                 ///   members and check the MemberTypes and BindingFlags properly.
1642                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1643                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1644                 ///   MemberInfo class, but the cache needs this information.  That's why
1645                 ///   this method is called multiple times with different BindingFlags.
1646                 /// </remarks>
1647                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1648
1649                 /// <summary>
1650                 ///   Return the container's member cache.
1651                 /// </summary>
1652                 MemberCache MemberCache {
1653                         get;
1654                 }
1655         }
1656
1657         /// <summary>
1658         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1659         ///   member lookups.  It has a member name based hash table; it maps each member
1660         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1661         ///   and the BindingFlags that were initially used to get it.  The cache contains
1662         ///   all members of the current class and all inherited members.  If this cache is
1663         ///   for an interface types, it also contains all inherited members.
1664         ///
1665         ///   There are two ways to get a MemberCache:
1666         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1667         ///     use the DeclSpace.MemberCache property.
1668         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1669         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1670         /// </summary>
1671         public class MemberCache {
1672                 public readonly IMemberContainer Container;
1673                 protected Hashtable member_hash;
1674                 protected Hashtable method_hash;
1675
1676                 /// <summary>
1677                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1678                 /// </summary>
1679                 public MemberCache (IMemberContainer container)
1680                 {
1681                         this.Container = container;
1682
1683                         Timer.IncrementCounter (CounterType.MemberCache);
1684                         Timer.StartTimer (TimerType.CacheInit);
1685
1686
1687
1688                         // If we have a parent class (we have a parent class unless we're
1689                         // TypeManager.object_type), we deep-copy its MemberCache here.
1690                         if (Container.IsInterface) {
1691                                 MemberCache parent;
1692
1693                                 if (Container.ParentContainer != null)
1694                                         parent = Container.ParentContainer.MemberCache;
1695                                 else
1696                                         parent = TypeHandle.ObjectType.MemberCache;
1697                                 member_hash = SetupCacheForInterface (parent);
1698                         } else if (Container.ParentContainer != null)
1699                                 member_hash = SetupCache (Container.ParentContainer.MemberCache);
1700                         else
1701                                 member_hash = new Hashtable ();
1702
1703                         // If this is neither a dynamic type nor an interface, create a special
1704                         // method cache with all declared and inherited methods.
1705                         Type type = container.Type;
1706                         if (!(type is TypeBuilder) && !type.IsInterface && !type.IsGenericParameter) {
1707                                 method_hash = new Hashtable ();
1708                                 AddMethods (type);
1709                         }
1710
1711                         // Add all members from the current class.
1712                         AddMembers (Container);
1713
1714                         Timer.StopTimer (TimerType.CacheInit);
1715                 }
1716
1717                 /// <summary>
1718                 ///   Bootstrap this member cache by doing a deep-copy of our parent.
1719                 /// </summary>
1720                 Hashtable SetupCache (MemberCache parent)
1721                 {
1722                         Hashtable hash = new Hashtable ();
1723
1724                         IDictionaryEnumerator it = parent.member_hash.GetEnumerator ();
1725                         while (it.MoveNext ()) {
1726                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1727                         }
1728
1729                         return hash;
1730                 }
1731
1732
1733                 /// <summary>
1734                 ///   Add the contents of `new_hash' to `hash'.
1735                 /// </summary>
1736                 void AddHashtable (Hashtable hash, MemberCache cache)
1737                 {
1738                         Hashtable new_hash = cache.member_hash;
1739                         IDictionaryEnumerator it = new_hash.GetEnumerator ();
1740                         while (it.MoveNext ()) {
1741                                 ArrayList list = (ArrayList) hash [it.Key];
1742                                 if (list == null)
1743                                         hash [it.Key] = list = new ArrayList ();
1744
1745                                 foreach (CacheEntry entry in (ArrayList) it.Value) {
1746                                         if (entry.Container != cache.Container)
1747                                                 break;
1748                                         list.Add (entry);
1749                                 }
1750                         }
1751                 }
1752
1753                 /// <summary>
1754                 ///   Bootstrap the member cache for an interface type.
1755                 ///   Type.GetMembers() won't return any inherited members for interface types,
1756                 ///   so we need to do this manually.  Interfaces also inherit from System.Object.
1757                 /// </summary>
1758                 Hashtable SetupCacheForInterface (MemberCache parent)
1759                 {
1760                         Hashtable hash = SetupCache (parent);
1761                         Type [] ifaces = TypeManager.GetInterfaces (Container.Type);
1762
1763                         foreach (Type itype in ifaces) {
1764                                 IMemberContainer iface_container =
1765                                         TypeManager.LookupMemberContainer (itype);
1766
1767                                 MemberCache iface_cache = iface_container.MemberCache;
1768
1769                                 AddHashtable (hash, iface_cache);
1770                         }
1771
1772                         return hash;
1773                 }
1774
1775                 /// <summary>
1776                 ///   Add all members from class `container' to the cache.
1777                 /// </summary>
1778                 void AddMembers (IMemberContainer container)
1779                 {
1780                         // We need to call AddMembers() with a single member type at a time
1781                         // to get the member type part of CacheEntry.EntryType right.
1782                         AddMembers (MemberTypes.Constructor, container);
1783                         AddMembers (MemberTypes.Field, container);
1784                         AddMembers (MemberTypes.Method, container);
1785                         AddMembers (MemberTypes.Property, container);
1786                         AddMembers (MemberTypes.Event, container);
1787                         // Nested types are returned by both Static and Instance searches.
1788                         AddMembers (MemberTypes.NestedType,
1789                                     BindingFlags.Static | BindingFlags.Public, container);
1790                         AddMembers (MemberTypes.NestedType,
1791                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1792                 }
1793
1794                 void AddMembers (MemberTypes mt, IMemberContainer container)
1795                 {
1796                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1797                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1798                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1799                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1800                 }
1801
1802                 /// <summary>
1803                 ///   Add all members from class `container' with the requested MemberTypes and
1804                 ///   BindingFlags to the cache.  This method is called multiple times with different
1805                 ///   MemberTypes and BindingFlags.
1806                 /// </summary>
1807                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1808                 {
1809                         MemberList members = container.GetMembers (mt, bf);
1810
1811                         foreach (MemberInfo member in members) {
1812                                 string name = member.Name;
1813
1814                                 int pos = name.IndexOf ('<');
1815                                 if (pos > 0)
1816                                         name = name.Substring (0, pos);
1817
1818                                 // We use a name-based hash table of ArrayList's.
1819                                 ArrayList list = (ArrayList) member_hash [name];
1820                                 if (list == null) {
1821                                         list = new ArrayList ();
1822                                         member_hash.Add (name, list);
1823                                 }
1824
1825                                 // When this method is called for the current class, the list will
1826                                 // already contain all inherited members from our parent classes.
1827                                 // We cannot add new members in front of the list since this'd be an
1828                                 // expensive operation, that's why the list is sorted in reverse order
1829                                 // (ie. members from the current class are coming last).
1830                                 list.Add (new CacheEntry (container, member, mt, bf));
1831                         }
1832                 }
1833
1834                 /// <summary>
1835                 ///   Add all declared and inherited methods from class `type' to the method cache.
1836                 /// </summary>
1837                 void AddMethods (Type type)
1838                 {
1839                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1840                                     BindingFlags.FlattenHierarchy, type);
1841                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1842                                     BindingFlags.FlattenHierarchy, type);
1843                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1844                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1845                 }
1846
1847                 void AddMethods (BindingFlags bf, Type type)
1848                 {
1849                         MemberInfo [] members = type.GetMethods (bf);
1850
1851                         Array.Reverse (members);
1852
1853                         foreach (MethodBase member in members) {
1854                                 string name = member.Name;
1855
1856                                 // We use a name-based hash table of ArrayList's.
1857                                 ArrayList list = (ArrayList) method_hash [name];
1858                                 if (list == null) {
1859                                         list = new ArrayList ();
1860                                         method_hash.Add (name, list);
1861                                 }
1862
1863                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1864                                 // sorted so we need to do this check for every member.
1865                                 BindingFlags new_bf = bf;
1866                                 if (member.DeclaringType == type)
1867                                         new_bf |= BindingFlags.DeclaredOnly;
1868
1869                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1870                         }
1871                 }
1872
1873                 /// <summary>
1874                 ///   Compute and return a appropriate `EntryType' magic number for the given
1875                 ///   MemberTypes and BindingFlags.
1876                 /// </summary>
1877                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1878                 {
1879                         EntryType type = EntryType.None;
1880
1881                         if ((mt & MemberTypes.Constructor) != 0)
1882                                 type |= EntryType.Constructor;
1883                         if ((mt & MemberTypes.Event) != 0)
1884                                 type |= EntryType.Event;
1885                         if ((mt & MemberTypes.Field) != 0)
1886                                 type |= EntryType.Field;
1887                         if ((mt & MemberTypes.Method) != 0)
1888                                 type |= EntryType.Method;
1889                         if ((mt & MemberTypes.Property) != 0)
1890                                 type |= EntryType.Property;
1891                         // Nested types are returned by static and instance searches.
1892                         if ((mt & MemberTypes.NestedType) != 0)
1893                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1894
1895                         if ((bf & BindingFlags.Instance) != 0)
1896                                 type |= EntryType.Instance;
1897                         if ((bf & BindingFlags.Static) != 0)
1898                                 type |= EntryType.Static;
1899                         if ((bf & BindingFlags.Public) != 0)
1900                                 type |= EntryType.Public;
1901                         if ((bf & BindingFlags.NonPublic) != 0)
1902                                 type |= EntryType.NonPublic;
1903                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1904                                 type |= EntryType.Declared;
1905
1906                         return type;
1907                 }
1908
1909                 /// <summary>
1910                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1911                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1912                 ///   single member types.
1913                 /// </summary>
1914                 public static bool IsSingleMemberType (MemberTypes mt)
1915                 {
1916                         switch (mt) {
1917                         case MemberTypes.Constructor:
1918                         case MemberTypes.Event:
1919                         case MemberTypes.Field:
1920                         case MemberTypes.Method:
1921                         case MemberTypes.Property:
1922                         case MemberTypes.NestedType:
1923                                 return true;
1924
1925                         default:
1926                                 return false;
1927                         }
1928                 }
1929
1930                 /// <summary>
1931                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1932                 ///   number to speed up the searching process.
1933                 /// </summary>
1934                 [Flags]
1935                 protected enum EntryType {
1936                         None            = 0x000,
1937
1938                         Instance        = 0x001,
1939                         Static          = 0x002,
1940                         MaskStatic      = Instance|Static,
1941
1942                         Public          = 0x004,
1943                         NonPublic       = 0x008,
1944                         MaskProtection  = Public|NonPublic,
1945
1946                         Declared        = 0x010,
1947
1948                         Constructor     = 0x020,
1949                         Event           = 0x040,
1950                         Field           = 0x080,
1951                         Method          = 0x100,
1952                         Property        = 0x200,
1953                         NestedType      = 0x400,
1954
1955                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1956                 }
1957
1958                 protected struct CacheEntry {
1959                         public readonly IMemberContainer Container;
1960                         public readonly EntryType EntryType;
1961                         public readonly MemberInfo Member;
1962
1963                         public CacheEntry (IMemberContainer container, MemberInfo member,
1964                                            MemberTypes mt, BindingFlags bf)
1965                         {
1966                                 this.Container = container;
1967                                 this.Member = member;
1968                                 this.EntryType = GetEntryType (mt, bf);
1969                         }
1970                 }
1971
1972                 /// <summary>
1973                 ///   This is called each time we're walking up one level in the class hierarchy
1974                 ///   and checks whether we can abort the search since we've already found what
1975                 ///   we were looking for.
1976                 /// </summary>
1977                 protected bool DoneSearching (ArrayList list)
1978                 {
1979                         //
1980                         // We've found exactly one member in the current class and it's not
1981                         // a method or constructor.
1982                         //
1983                         if (list.Count == 1 && !(list [0] is MethodBase))
1984                                 return true;
1985
1986                         //
1987                         // Multiple properties: we query those just to find out the indexer
1988                         // name
1989                         //
1990                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1991                                 return true;
1992
1993                         return false;
1994                 }
1995
1996                 /// <summary>
1997                 ///   Looks up members with name `name'.  If you provide an optional
1998                 ///   filter function, it'll only be called with members matching the
1999                 ///   requested member name.
2000                 ///
2001                 ///   This method will try to use the cache to do the lookup if possible.
2002                 ///
2003                 ///   Unlike other FindMembers implementations, this method will always
2004                 ///   check all inherited members - even when called on an interface type.
2005                 ///
2006                 ///   If you know that you're only looking for methods, you should use
2007                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
2008                 ///   When doing a method-only search, it'll try to use a special method
2009                 ///   cache (unless it's a dynamic type or an interface) and the returned
2010                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
2011                 ///   The lookup process will automatically restart itself in method-only
2012                 ///   search mode if it discovers that it's about to return methods.
2013                 /// </summary>
2014                 ArrayList global = new ArrayList ();
2015                 bool using_global = false;
2016
2017                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
2018
2019                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
2020                                                MemberFilter filter, object criteria)
2021                 {
2022                         if (using_global)
2023                                 throw new Exception ();
2024
2025                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
2026                         bool method_search = mt == MemberTypes.Method;
2027                         // If we have a method cache and we aren't already doing a method-only search,
2028                         // then we restart a method search if the first match is a method.
2029                         bool do_method_search = !method_search && (method_hash != null);
2030
2031                         ArrayList applicable;
2032
2033                         // If this is a method-only search, we try to use the method cache if
2034                         // possible; a lookup in the method cache will return a MemberInfo with
2035                         // the correct ReflectedType for inherited methods.
2036
2037                         if (method_search && (method_hash != null))
2038                                 applicable = (ArrayList) method_hash [name];
2039                         else
2040                                 applicable = (ArrayList) member_hash [name];
2041
2042                         if (applicable == null)
2043                                 return emptyMemberInfo;
2044
2045                         //
2046                         // 32  slots gives 53 rss/54 size
2047                         // 2/4 slots gives 55 rss
2048                         //
2049                         // Strange: from 25,000 calls, only 1,800
2050                         // are above 2.  Why does this impact it?
2051                         //
2052                         global.Clear ();
2053                         using_global = true;
2054
2055                         Timer.StartTimer (TimerType.CachedLookup);
2056
2057                         EntryType type = GetEntryType (mt, bf);
2058
2059                         IMemberContainer current = Container;
2060
2061
2062                         // `applicable' is a list of all members with the given member name `name'
2063                         // in the current class and all its parent classes.  The list is sorted in
2064                         // reverse order due to the way how the cache is initialy created (to speed
2065                         // things up, we're doing a deep-copy of our parent).
2066
2067                         for (int i = applicable.Count-1; i >= 0; i--) {
2068                                 CacheEntry entry = (CacheEntry) applicable [i];
2069
2070                                 // This happens each time we're walking one level up in the class
2071                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
2072                                 // the first time this happens (this may already happen in the first
2073                                 // iteration of this loop if there are no members with the name we're
2074                                 // looking for in the current class).
2075                                 if (entry.Container != current) {
2076                                         if (declared_only || DoneSearching (global))
2077                                                 break;
2078
2079                                         current = entry.Container;
2080                                 }
2081
2082                                 // Is the member of the correct type ?
2083                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2084                                         continue;
2085
2086                                 // Is the member static/non-static ?
2087                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2088                                         continue;
2089
2090                                 // Apply the filter to it.
2091                                 if (filter (entry.Member, criteria)) {
2092                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
2093                                                 do_method_search = false;
2094                                         global.Add (entry.Member);
2095                                 }
2096                         }
2097
2098                         Timer.StopTimer (TimerType.CachedLookup);
2099
2100                         // If we have a method cache and we aren't already doing a method-only
2101                         // search, we restart in method-only search mode if the first match is
2102                         // a method.  This ensures that we return a MemberInfo with the correct
2103                         // ReflectedType for inherited methods.
2104                         if (do_method_search && (global.Count > 0)){
2105                                 using_global = false;
2106
2107                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2108                         }
2109
2110                         using_global = false;
2111                         MemberInfo [] copy = new MemberInfo [global.Count];
2112                         global.CopyTo (copy);
2113                         return copy;
2114                 }
2115
2116                 //
2117                 // This finds the method or property for us to override. invocationType is the type where
2118                 // the override is going to be declared, name is the name of the method/property, and
2119                 // paramTypes is the parameters, if any to the method or property
2120                 //
2121                 // Because the MemberCache holds members from this class and all the base classes,
2122                 // we can avoid tons of reflection stuff.
2123                 //
2124                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
2125                 {
2126                         ArrayList applicable;
2127                         if (method_hash != null && !is_property)
2128                                 applicable = (ArrayList) method_hash [name];
2129                         else
2130                                 applicable = (ArrayList) member_hash [name];
2131
2132                         if (applicable == null)
2133                                 return null;
2134                         //
2135                         // Walk the chain of methods, starting from the top.
2136                         //
2137                         for (int i = applicable.Count - 1; i >= 0; i--) {
2138                                 CacheEntry entry = (CacheEntry) applicable [i];
2139
2140                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2141                                         continue;
2142
2143                                 PropertyInfo pi = null;
2144                                 MethodInfo mi = null;
2145                                 FieldInfo fi = null;
2146                                 Type [] cmpAttrs = null;
2147
2148                                 if (is_property) {
2149                                         if ((entry.EntryType & EntryType.Field) != 0) {
2150                                                 fi = (FieldInfo)entry.Member;
2151
2152                                                 // TODO: For this case we ignore member type
2153                                                 //fb = TypeManager.GetField (fi);
2154                                                 //cmpAttrs = new Type[] { fb.MemberType };
2155                                         } else {
2156                                                 pi = (PropertyInfo) entry.Member;
2157                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
2158                                         }
2159                                 } else {
2160                                         mi = (MethodInfo) entry.Member;
2161                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
2162                                 }
2163
2164                                 if (fi != null) {
2165                                         // TODO: Almost duplicate !
2166                                         // Check visibility
2167                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2168                                                 case FieldAttributes.Private:
2169                                                         //
2170                                                         // A private method is Ok if we are a nested subtype.
2171                                                         // The spec actually is not very clear about this, see bug 52458.
2172                                                         //
2173                                                         if (invocationType != entry.Container.Type &
2174                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2175                                                                 continue;
2176
2177                                                         break;
2178                                                 case FieldAttributes.FamANDAssem:
2179                                                 case FieldAttributes.Assembly:
2180                                                         //
2181                                                         // Check for assembly methods
2182                                                         //
2183                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2184                                                                 continue;
2185                                                         break;
2186                                         }
2187                                         return entry.Member;
2188                                 }
2189
2190                                 //
2191                                 // Check the arguments
2192                                 //
2193                                 if (cmpAttrs.Length != paramTypes.Length)
2194                                         continue;
2195
2196                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --) {
2197                                         if (!TypeManager.IsEqual (paramTypes [j], cmpAttrs [j]))
2198                                                 goto next;
2199                                 }
2200
2201                                 //
2202                                 // get one of the methods because this has the visibility info.
2203                                 //
2204                                 if (is_property) {
2205                                         mi = pi.GetGetMethod (true);
2206                                         if (mi == null)
2207                                                 mi = pi.GetSetMethod (true);
2208                                 }
2209
2210                                 //
2211                                 // Check visibility
2212                                 //
2213                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2214                                 case MethodAttributes.Private:
2215                                         //
2216                                         // A private method is Ok if we are a nested subtype.
2217                                         // The spec actually is not very clear about this, see bug 52458.
2218                                         //
2219                                         if (invocationType.Equals (entry.Container.Type) ||
2220                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
2221                                                 return entry.Member;
2222
2223                                         break;
2224                                 case MethodAttributes.FamANDAssem:
2225                                 case MethodAttributes.Assembly:
2226                                         //
2227                                         // Check for assembly methods
2228                                         //
2229                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
2230                                                 return entry.Member;
2231
2232                                         break;
2233                                 default:
2234                                         //
2235                                         // A protected method is ok, because we are overriding.
2236                                         // public is always ok.
2237                                         //
2238                                         return entry.Member;
2239                                 }
2240                         next:
2241                                 ;
2242                         }
2243
2244                         return null;
2245                 }
2246
2247                 /// <summary>
2248                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2249                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2250                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2251                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2252                 /// </summary>
2253                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2254                 {
2255                         ArrayList applicable = null;
2256
2257                         if (method_hash != null)
2258                                 applicable = (ArrayList) method_hash [name];
2259
2260                         if (applicable != null) {
2261                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2262                                         CacheEntry entry = (CacheEntry) applicable [i];
2263                                         if ((entry.EntryType & EntryType.Public) != 0)
2264                                                 return entry.Member;
2265                                 }
2266                         }
2267
2268                         if (member_hash == null)
2269                                 return null;
2270                         applicable = (ArrayList) member_hash [name];
2271
2272                         if (applicable != null) {
2273                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2274                                         CacheEntry entry = (CacheEntry) applicable [i];
2275                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2276                                                 if (ignore_complex_types) {
2277                                                         if ((entry.EntryType & EntryType.Method) != 0)
2278                                                                 continue;
2279
2280                                                         // Does exist easier way how to detect indexer ?
2281                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2282                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
2283                                                                 if (arg_types.Length > 0)
2284                                                                         continue;
2285                                                         }
2286                                                 }
2287                                                 return entry.Member;
2288                                         }
2289                                 }
2290                         }
2291                         return null;
2292                 }
2293
2294                 Hashtable locase_table;
2295
2296                 /// <summary>
2297                 /// Builds low-case table for CLS Compliance test
2298                 /// </summary>
2299                 public Hashtable GetPublicMembers ()
2300                 {
2301                         if (locase_table != null)
2302                                 return locase_table;
2303
2304                         locase_table = new Hashtable ();
2305                         foreach (DictionaryEntry entry in member_hash) {
2306                                 ArrayList members = (ArrayList)entry.Value;
2307                                 for (int ii = 0; ii < members.Count; ++ii) {
2308                                         CacheEntry member_entry = (CacheEntry) members [ii];
2309
2310                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2311                                                 continue;
2312
2313                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2314                                         switch (member_entry.EntryType & EntryType.MaskType) {
2315                                                 case EntryType.Constructor:
2316                                                         continue;
2317
2318                                                 case EntryType.Field:
2319                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2320                                                                 continue;
2321                                                         break;
2322
2323                                                 case EntryType.Method:
2324                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2325                                                                 continue;
2326                                                         break;
2327
2328                                                 case EntryType.Property:
2329                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
2330                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2331                                                                 continue;
2332                                                         break;
2333
2334                                                 case EntryType.Event:
2335                                                         EventInfo ei = (EventInfo)member_entry.Member;
2336                                                         MethodInfo mi = ei.GetAddMethod ();
2337                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2338                                                                 continue;
2339                                                         break;
2340                                         }
2341                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2342                                         locase_table [lcase] = member_entry.Member;
2343                                         break;
2344                                 }
2345                         }
2346                         return locase_table;
2347                 }
2348
2349                 public Hashtable Members {
2350                         get {
2351                                 return member_hash;
2352                         }
2353                 }
2354
2355                 /// <summary>
2356                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2357                 /// </summary>
2358                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2359                 {
2360                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2361
2362                         for (int i = 0; i < al.Count; ++i) {
2363                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2364
2365                                 // skip itself
2366                                 if (entry.Member == this_builder)
2367                                         continue;
2368
2369                                 if ((entry.EntryType & tested_type) != tested_type)
2370                                         continue;
2371
2372                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2373                                 if (AttributeTester.AreOverloadedMethodParamsClsCompliant (method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare)))
2374                                         continue;
2375
2376                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2377
2378                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2379                                 // However it is exactly what csc does.
2380                                 if (md != null && !md.IsClsCompliaceRequired (method.Parent))
2381                                         continue;
2382
2383                                 Report.SymbolRelatedToPreviousError (entry.Member);
2384                                 Report.Error (3006, method.Location, "Overloaded method '{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2385                         }
2386                 }
2387         }
2388 }