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 //
   6 // Licensed under the terms of the GNU GPL
   7 //
   8 // (C) 2001 Ximian, Inc (http://www.ximian.com)
   9 //
  10 // TODO: Move the method verification stuff from the class.cs and interface.cs here
  11 //
  12
  13 using System;
  14 using System.Collections;
  15 using System.Reflection.Emit;
  16 using System.Reflection;
  17
  18 namespace Mono.CSharp {
  19
  20         /// <summary>
  21         ///   Base representation for members.  This is only used to keep track
  22         ///   of Name, Location and Modifier flags.
  23         /// </summary>
  24         public abstract class MemberCore {
  25                 /// <summary>
  26                 ///   Public name
  27                 /// </summary>
  28                 public string Name;
  29
  30                 /// <summary>
  31                 ///   Modifier flags that the user specified in the source code
  32                 /// </summary>
  33                 public int ModFlags;
  34
  35                 /// <summary>
  36                 ///   Location where this declaration happens
  37                 /// </summary>
  38                 public readonly Location Location;
  39
  40                 public MemberCore (string name, Location loc)
  41                 {
  42                         Name = name;
  43                         Location = loc;
  44                 }
  45
  46                 protected void WarningNotHiding (TypeContainer parent)
  47                 {
  48                         Report.Warning (
  49                                 109, Location,
  50                                 "The member " + parent.MakeName (Name) + " does not hide an " +
  51                                 "inherited member.  The keyword new is not required");
  52
  53                 }
  54
  55                 void Error_CannotChangeAccessModifiers (TypeContainer parent, MethodInfo parent_method,
  56                                                         string name)
  57                 {
  58                         //
  59                         // FIXME: report the old/new permissions?
  60                         //
  61                         Report.Error (
  62                                 507, Location, parent.MakeName (Name) +
  63                                 ": can't change the access modifiers when overriding inherited " +
  64                                 "member `" + name + "'");
  65                 }
  66
  67                 //
  68                 // Performs various checks on the MethodInfo `mb' regarding the modifier flags
  69                 // that have been defined.
  70                 //
  71                 // `name' is the user visible name for reporting errors (this is used to
  72                 // provide the right name regarding method names and properties)
  73                 //
  74                 protected bool CheckMethodAgainstBase (TypeContainer parent, MethodAttributes my_attrs,
  75                                                        MethodInfo mb, string name)
  76                 {
  77                         bool ok = true;
  78
  79                         if ((ModFlags & Modifiers.OVERRIDE) != 0){
  80                                 if (!(mb.IsAbstract || mb.IsVirtual)){
  81                                         Report.Error (
  82                                                 506, Location, parent.MakeName (Name) +
  83                                                 ": cannot override inherited member `" +
  84                                                 name + "' because it is not " +
  85                                                 "virtual, abstract or override");
  86                                         ok = false;
  87                                 }
  88
  89                                 // Now we check that the overriden method is not final
  90
  91                                 if (mb.IsFinal) {
  92                                         // This happens when implementing interface methods.
  93                                         if (mb.IsHideBySig && mb.IsVirtual) {
  94                                                 Report.Error (
  95                                                         506, Location, parent.MakeName (Name) +
  96                                                         ": cannot override inherited member `" +
  97                                                         name + "' because it is not " +
  98                                                         "virtual, abstract or override");
  99                                         } else
 100                                                 Report.Error (239, Location, parent.MakeName (Name) + " : cannot " +
 101                                                               "override inherited member `" + name +
 102                                                               "' because it is sealed.");
 103                                         ok = false;
 104                                 }
 105                                 //
 106                                 // Check that the permissions are not being changed
 107                                 //
 108                                 MethodAttributes thisp = my_attrs & MethodAttributes.MemberAccessMask;
 109                                 MethodAttributes parentp = mb.Attributes & MethodAttributes.MemberAccessMask;
 110
 111                                 //
 112                                 // special case for "protected internal"
 113                                 //
 114
 115                                 if ((parentp & MethodAttributes.FamORAssem) == MethodAttributes.FamORAssem){
 116                                         //
 117                                         // when overriding protected internal, the method can be declared
 118                                         // protected internal only within the same assembly
 119                                         //
 120
 121                                         if ((thisp & MethodAttributes.FamORAssem) == MethodAttributes.FamORAssem){
 122                                                 if (parent.TypeBuilder.Assembly != mb.DeclaringType.Assembly){
 123                                                         //
 124                                                         // assemblies differ - report an error
 125                                                         //
 126
 127                                                         Error_CannotChangeAccessModifiers (parent, mb, name);
 128                                                     ok = false;
 129                                                 } else if (thisp != parentp) {
 130                                                         //
 131                                                         // same assembly, but other attributes differ - report an error
 132                                                         //
 133
 134                                                         Error_CannotChangeAccessModifiers (parent, mb, name);
 135                                                         ok = false;
 136                                                 };
 137                                         } else if ((thisp & MethodAttributes.Family) != MethodAttributes.Family) {
 138                                                 //
 139                                                 // if it's not "protected internal", it must be "protected"
 140                                                 //
 141
 142                                                 Error_CannotChangeAccessModifiers (parent, mb, name);
 143                                                 ok = false;
 144                                         } else if (parent.TypeBuilder.Assembly == mb.DeclaringType.Assembly) {
 145                                                 //
 146                                                 // protected within the same assembly - an error
 147                                                 //
 148                                                 Error_CannotChangeAccessModifiers (parent, mb, name);
 149                                                 ok = false;
 150                                         } else if ((thisp & ~(MethodAttributes.Family | MethodAttributes.FamORAssem)) !=
 151                                                    (parentp & ~(MethodAttributes.Family | MethodAttributes.FamORAssem))) {
 152                                                 //
 153                                                 // protected ok, but other attributes differ - report an error
 154                                                 //
 155                                                 Error_CannotChangeAccessModifiers (parent, mb, name);
 156                                                 ok = false;
 157                                         }
 158                                 } else {
 159                                         if (thisp != parentp){
 160                                                 Error_CannotChangeAccessModifiers (parent, mb, name);
 161                                                 ok = false;
 162                                         }
 163                                 }
 164                         }
 165
 166                         if (mb.IsVirtual || mb.IsAbstract){
 167                                 if ((ModFlags & (Modifiers.NEW | Modifiers.OVERRIDE)) == 0){
 168                                         if (Name != "Finalize"){
 169                                                 Report.Warning (
 170                                                         114, 2, Location, parent.MakeName (Name) +
 171                                                         " hides inherited member `" + name +
 172                                                         "'.  To make the current member override that " +
 173                                                         "implementation, add the override keyword, " +
 174                                                         "otherwise use the new keyword");
 175                                                 ModFlags |= Modifiers.NEW;
 176                                         }
 177                                 }
 178                         } else {
 179                                 if ((ModFlags & (Modifiers.NEW | Modifiers.OVERRIDE)) == 0){
 180                                         if (Name != "Finalize"){
 181                                                 Report.Warning (
 182                                                         108, 1, Location, "The keyword new is required on " +
 183                                                         parent.MakeName (Name) + " because it hides " +
 184                                                         "inherited member `" + name + "'");
 185                                                 ModFlags |= Modifiers.NEW;
 186                                         }
 187                                 }
 188                         }
 189
 190                         return ok;
 191                 }
 192
 193                 public abstract bool Define (TypeContainer parent);
 194
 195                 //
 196                 // Whehter is it ok to use an unsafe pointer in this type container
 197                 //
 198                 public bool UnsafeOK (DeclSpace parent)
 199                 {
 200                         //
 201                         // First check if this MemberCore modifier flags has unsafe set
 202                         //
 203                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 204                                 return true;
 205
 206                         if (parent.UnsafeContext)
 207                                 return true;
 208
 209                         Expression.UnsafeError (Location);
 210                         return false;
 211                 }
 212         }
 213
 214         //
 215         // FIXME: This is temporary outside DeclSpace, because I have to fix a bug
 216         // in MCS that makes it fail the lookup for the enum
 217         //
 218
 219                 /// <summary>
 220                 ///   The result value from adding an declaration into
 221                 ///   a struct or a class
 222                 /// </summary>
 223                 public enum AdditionResult {
 224                         /// <summary>
 225                         /// The declaration has been successfully
 226                         /// added to the declation space.
 227                         /// </summary>
 228                         Success,
 229
 230                         /// <summary>
 231                         ///   The symbol has already been defined.
 232                         /// </summary>
 233                         NameExists,
 234
 235                         /// <summary>
 236                         ///   Returned if the declation being added to the
 237                         ///   name space clashes with its container name.
 238                         ///
 239                         ///   The only exceptions for this are constructors
 240                         ///   and static constructors
 241                         /// </summary>
 242                         EnclosingClash,
 243
 244                         /// <summary>
 245                         ///   Returned if a constructor was created (because syntactically
 246                         ///   it looked like a constructor) but was not (because the name
 247                         ///   of the method is not the same as the container class
 248                         /// </summary>
 249                         NotAConstructor,
 250
 251                         /// <summary>
 252                         ///   This is only used by static constructors to emit the
 253                         ///   error 111, but this error for other things really
 254                         ///   happens at another level for other functions.
 255                         /// </summary>
 256                         MethodExists,
 257
 258                         /// <summary>
 259                         ///   Some other error.
 260                         /// </summary>
 261                         Error
 262                 }
 263
 264         /// <summary>
 265         ///   Base class for structs, classes, enumerations and interfaces.
 266         /// </summary>
 267         /// <remarks>
 268         ///   They all create new declaration spaces.  This
 269         ///   provides the common foundation for managing those name
 270         ///   spaces.
 271         /// </remarks>
 272         public abstract class DeclSpace : MemberCore {
 273                 /// <summary>
 274                 ///   this points to the actual definition that is being
 275                 ///   created with System.Reflection.Emit
 276                 /// </summary>
 277                 public TypeBuilder TypeBuilder;
 278
 279                 /// <summary>
 280                 ///   This variable tracks whether we have Closed the type
 281                 /// </summary>
 282                 public bool Created = false;
 283
 284                 //
 285                 // This is the namespace in which this typecontainer
 286                 // was declared.  We use this to resolve names.
 287                 //
 288                 public NamespaceEntry Namespace;
 289
 290                 public Hashtable Cache = new Hashtable ();
 291
 292                 public string Basename;
 293
 294                 /// <summary>
 295                 ///   defined_names is used for toplevel objects
 296                 /// </summary>
 297                 protected Hashtable defined_names;
 298
 299                 //
 300                 // Whether we are Generic
 301                 //
 302                 public bool IsGeneric;
 303
 304                 TypeContainer parent;
 305
 306                 public DeclSpace (TypeContainer parent, string name, Location l)
 307                         : base (name, l)
 308                 {
 309                         Basename = name.Substring (1 + name.LastIndexOf ('.'));
 310                         defined_names = new Hashtable ();
 311                         this.parent = parent;
 312
 313                         //
 314                         // We are generic if our parent is generic
 315                         //
 316                         if (parent != null)
 317                                 IsGeneric = parent.IsGeneric;
 318                 }
 319
 320                 /// <summary>
 321                 ///   Returns a status code based purely on the name
 322                 ///   of the member being added
 323                 /// </summary>
 324                 protected AdditionResult IsValid (string basename, string name)
 325                 {
 326                         if (basename == Basename)
 327                                 return AdditionResult.EnclosingClash;
 328
 329                         if (defined_names.Contains (name))
 330                                 return AdditionResult.NameExists;
 331
 332                         return AdditionResult.Success;
 333                 }
 334
 335                 public static int length;
 336                 public static int small;
 337
 338                 /// <summary>
 339                 ///   Introduce @name into this declaration space and
 340                 ///   associates it with the object @o.  Note that for
 341                 ///   methods this will just point to the first method. o
 342                 /// </summary>
 343                 protected void DefineName (string name, object o)
 344                 {
 345                         defined_names.Add (name, o);
 346
 347 #if DEBUGME
 348                         int p = name.LastIndexOf (".");
 349                         int l = name.Length;
 350                         length += l;
 351                         small += l -p;
 352 #endif
 353                 }
 354
 355                 /// <summary>
 356                 ///   Returns the object associated with a given name in the declaration
 357                 ///   space.  This is the inverse operation of `DefineName'
 358                 /// </summary>
 359                 public object GetDefinition (string name)
 360                 {
 361                         return defined_names [name];
 362                 }
 363
 364                 bool in_transit = false;
 365
 366                 /// <summary>
 367                 ///   This function is used to catch recursive definitions
 368                 ///   in declarations.
 369                 /// </summary>
 370                 public bool InTransit {
 371                         get {
 372                                 return in_transit;
 373                         }
 374
 375                         set {
 376                                 in_transit = value;
 377                         }
 378                 }
 379
 380                 public TypeContainer Parent {
 381                         get {
 382                                 return parent;
 383                         }
 384                 }
 385
 386                 /// <summary>
 387                 ///   Looks up the alias for the name
 388                 /// </summary>
 389                 public string LookupAlias (string name)
 390                 {
 391                         if (Namespace != null)
 392                                 return Namespace.LookupAlias (name);
 393                         else
 394                                 return null;
 395                 }
 396
 397                 //
 398                 // root_types contains all the types.  All TopLevel types
 399                 // hence have a parent that points to `root_types', that is
 400                 // why there is a non-obvious test down here.
 401                 //
 402                 public bool IsTopLevel {
 403                         get {
 404                                 if (parent != null){
 405                                         if (parent.parent == null)
 406                                                 return true;
 407                                 }
 408                                 return false;
 409                         }
 410                 }
 411
 412                 public virtual void CloseType ()
 413                 {
 414                         if (!Created){
 415                                 try {
 416                                         TypeBuilder.CreateType ();
 417                                 } catch {
 418                                         //
 419                                         // The try/catch is needed because
 420                                         // nested enumerations fail to load when they
 421                                         // are defined.
 422                                         //
 423                                         // Even if this is the right order (enumerations
 424                                         // declared after types).
 425                                         //
 426                                         // Note that this still creates the type and
 427                                         // it is possible to save it
 428                                 }
 429                                 Created = true;
 430                         }
 431                 }
 432
 433                 /// <remarks>
 434                 ///  Should be overriten by the appropriate declaration space
 435                 /// </remarks>
 436                 public abstract TypeBuilder DefineType ();
 437
 438                 /// <summary>
 439                 ///   Define all members, but don't apply any attributes or do anything which may
 440                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 441                 /// </summary>
 442                 public abstract bool DefineMembers (TypeContainer parent);
 443
 444                 //
 445                 // Whether this is an `unsafe context'
 446                 //
 447                 public bool UnsafeContext {
 448                         get {
 449                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 450                                         return true;
 451                                 if (parent != null)
 452                                         return parent.UnsafeContext;
 453                                 return false;
 454                         }
 455                 }
 456
 457                 public static string MakeFQN (string nsn, string name)
 458                 {
 459                         if (nsn == "")
 460                                 return name;
 461                         return String.Concat (nsn, ".", name);
 462                 }
 463
 464                 EmitContext type_resolve_ec;
 465                 EmitContext GetTypeResolveEmitContext (TypeContainer parent, Location loc)
 466                 {
 467                         type_resolve_ec = new EmitContext (parent, this, loc, null, null, ModFlags, false);
 468                         type_resolve_ec.ResolvingTypeTree = true;
 469
 470                         return type_resolve_ec;
 471                 }
 472
 473                 // <summary>
 474                 //    Looks up the type, as parsed into the expression `e'
 475                 // </summary>
 476                 public Type ResolveType (Expression e, bool silent, Location loc)
 477                 {
 478                         if (type_resolve_ec == null)
 479                                 type_resolve_ec = GetTypeResolveEmitContext (parent, loc);
 480                         type_resolve_ec.loc = loc;
 481                         type_resolve_ec.ContainerType = TypeBuilder;
 482
 483                         int errors = Report.Errors;
 484                         Expression d = e.ResolveAsTypeTerminal (type_resolve_ec);
 485
 486                         if (d == null || d.eclass != ExprClass.Type){
 487                                 if (!silent && errors == Report.Errors){
 488                                         Report.Error (246, loc, "Cannot find type `"+ e.ToString () +"'");
 489                                 }
 490                                 return null;
 491                         }
 492
 493                         if (!CheckAccessLevel (d.Type)) {
 494                                 Report. Error (122, loc,  "`" + d.Type + "' " +
 495                                        "is inaccessible because of its protection level");
 496                                 return null;
 497                         }
 498
 499                         return d.Type;
 500                 }
 501
 502                 // <summary>
 503                 //    Resolves the expression `e' for a type, and will recursively define
 504                 //    types.
 505                 // </summary>
 506                 public Expression ResolveTypeExpr (Expression e, bool silent, Location loc)
 507                 {
 508                         if (type_resolve_ec == null)
 509                                 type_resolve_ec = GetTypeResolveEmitContext (parent, loc);
 510                         type_resolve_ec.loc = loc;
 511                         type_resolve_ec.ContainerType = TypeBuilder;
 512
 513                         Expression d = e.ResolveAsTypeTerminal (type_resolve_ec);
 514
 515                         if (d == null || d.eclass != ExprClass.Type){
 516                                 if (!silent){
 517                                         Report.Error (246, loc, "Cannot find type `"+ e +"'");
 518                                 }
 519                                 return null;
 520                         }
 521
 522                         return d;
 523                 }
 524
 525                 public bool CheckAccessLevel (Type check_type)
 526                 {
 527                         if (check_type == TypeBuilder)
 528                                 return true;
 529
 530                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 531
 532                         //
 533                         // Broken Microsoft runtime, return public for arrays, no matter what
 534                         // the accessibility is for their underlying class, and they return
 535                         // NonPublic visibility for pointers
 536                         //
 537                         if (check_type.IsArray || check_type.IsPointer)
 538                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 539
 540                         switch (check_attr){
 541                         case TypeAttributes.Public:
 542                                 return true;
 543
 544                         case TypeAttributes.NotPublic:
 545                                 //
 546                                 // This test should probably use the declaringtype.
 547                                 //
 548                                 if (check_type.Assembly == TypeBuilder.Assembly){
 549                                         return true;
 550                                 }
 551                                 return false;
 552
 553                         case TypeAttributes.NestedPublic:
 554                                 return true;
 555
 556                         case TypeAttributes.NestedPrivate:
 557                                 string check_type_name = check_type.FullName;
 558                                 string type_name = TypeBuilder.FullName;
 559
 560                                 int cio = check_type_name.LastIndexOf ("+");
 561                                 string container = check_type_name.Substring (0, cio);
 562
 563                                 //
 564                                 // Check if the check_type is a nested class of the current type
 565                                 //
 566                                 if (check_type_name.StartsWith (type_name + "+")){
 567                                         return true;
 568                                 }
 569
 570                                 if (type_name.StartsWith (container)){
 571                                         return true;
 572                                 }
 573
 574                                 return false;
 575
 576                         case TypeAttributes.NestedFamily:
 577                                 //
 578                                 // Only accessible to methods in current type or any subtypes
 579                                 //
 580                                 return FamilyAccessible (check_type);
 581
 582                         case TypeAttributes.NestedFamANDAssem:
 583                                 return (check_type.Assembly == TypeBuilder.Assembly) &&
 584                                         FamilyAccessible (check_type);
 585
 586                         case TypeAttributes.NestedFamORAssem:
 587                                 return (check_type.Assembly == TypeBuilder.Assembly) ||
 588                                         FamilyAccessible (check_type);
 589
 590                         case TypeAttributes.NestedAssembly:
 591                                 return check_type.Assembly == TypeBuilder.Assembly;
 592                         }
 593
 594                         Console.WriteLine ("HERE: " + check_attr);
 595                         return false;
 596
 597                 }
 598
 599                 protected bool FamilyAccessible (Type check_type)
 600                 {
 601                         Type declaring = check_type.DeclaringType;
 602                         if (TypeBuilder.IsSubclassOf (declaring))
 603                                 return true;
 604
 605                         string check_type_name = check_type.FullName;
 606                         string type_name = TypeBuilder.FullName;
 607
 608                         int cio = check_type_name.LastIndexOf ("+");
 609                         string container = check_type_name.Substring (0, cio);
 610
 611                         //
 612                         // Check if the check_type is a nested class of the current type
 613                         //
 614                         if (check_type_name.StartsWith (container + "+"))
 615                                 return true;
 616
 617                         return false;
 618                 }
 619
 620
 621                 Type LookupInterfaceOrClass (string ns, string name, out bool error)
 622                 {
 623                         DeclSpace parent;
 624                         Type t;
 625
 626                         error = false;
 627
 628                         name = MakeFQN (ns, name);
 629
 630                         t  = TypeManager.LookupType (name);
 631                         if (t != null)
 632                                 return t;
 633
 634                         parent = (DeclSpace) RootContext.Tree.Decls [name];
 635                         if (parent == null)
 636                                 return null;
 637
 638                         t = parent.DefineType ();
 639                         if (t == null){
 640                                 Report.Error (146, Location, "Class definition is circular: `"+name+"'");
 641                                 error = true;
 642                                 return null;
 643                         }
 644                         return t;
 645                 }
 646
 647                 public static void Error_AmbiguousTypeReference (Location loc, string name, Type t1, Type t2)
 648                 {
 649                         Report.Error (104, loc,
 650                                       String.Format ("`{0}' is an ambiguous reference ({1} or {2}) ", name,
 651                                                      t1.FullName, t2.FullName));
 652                 }
 653
 654                 /// <summary>
 655                 ///   GetType is used to resolve type names at the DeclSpace level.
 656                 ///   Use this to lookup class/struct bases, interface bases or
 657                 ///   delegate type references
 658                 /// </summary>
 659                 ///
 660                 /// <remarks>
 661                 ///   Contrast this to LookupType which is used inside method bodies to
 662                 ///   lookup types that have already been defined.  GetType is used
 663                 ///   during the tree resolution process and potentially define
 664                 ///   recursively the type
 665                 /// </remarks>
 666                 public Type FindType (Location loc, string name)
 667                 {
 668                         Type t;
 669                         bool error;
 670
 671                         //
 672                         // For the case the type we are looking for is nested within this one
 673                         // or is in any base class
 674                         //
 675                         DeclSpace containing_ds = this;
 676
 677                         while (containing_ds != null){
 678                                 Type container_type = containing_ds.TypeBuilder;
 679                                 Type current_type = container_type;
 680
 681                                 while (current_type != null) {
 682                                         string pre = current_type.FullName;
 683
 684                                         t = LookupInterfaceOrClass (pre, name, out error);
 685                                         if (error)
 686                                                 return null;
 687
 688                                         if ((t != null) && containing_ds.CheckAccessLevel (t))
 689                                                 return t;
 690
 691                                         current_type = current_type.BaseType;
 692                                 }
 693                                 containing_ds = containing_ds.Parent;
 694                         }
 695
 696                         //
 697                         // Attempt to lookup the class on our namespace and all it's implicit parents
 698                         //
 699                         for (NamespaceEntry ns = Namespace; ns != null; ns = ns.ImplicitParent) {
 700                                 t = LookupInterfaceOrClass (ns.Name, name, out error);
 701                                 if (error)
 702                                         return null;
 703
 704                                 if (t != null)
 705                                         return t;
 706                         }
 707
 708                         //
 709                         // Attempt to do a direct unqualified lookup
 710                         //
 711                         t = LookupInterfaceOrClass ("", name, out error);
 712                         if (error)
 713                                 return null;
 714
 715                         if (t != null)
 716                                 return t;
 717
 718                         //
 719                         // Attempt to lookup the class on any of the `using'
 720                         // namespaces
 721                         //
 722
 723                         for (NamespaceEntry ns = Namespace; ns != null; ns = ns.Parent){
 724
 725                                 t = LookupInterfaceOrClass (ns.Name, name, out error);
 726                                 if (error)
 727                                         return null;
 728
 729                                 if (t != null)
 730                                         return t;
 731
 732                                 //
 733                                 // Now check the using clause list
 734                                 //
 735                                 Type match = null;
 736                                 foreach (Namespace using_ns in ns.GetUsingTable ()) {
 737                                         match = LookupInterfaceOrClass (using_ns.Name, name, out error);
 738                                         if (error)
 739                                                 return null;
 740
 741                                         if (match != null){
 742                                                 if (t != null){
 743                                                         if (CheckAccessLevel (match)) {
 744                                                                 Error_AmbiguousTypeReference (loc, name, t, match);
 745                                                                 return null;
 746                                                         }
 747                                                         continue;
 748                                                 }
 749
 750                                                 t = match;
 751                                         }
 752                                 }
 753                                 if (t != null)
 754                                         return t;
 755                         }
 756
 757                         //Report.Error (246, Location, "Can not find type `"+name+"'");
 758                         return null;
 759                 }
 760
 761                 /// <remarks>
 762                 ///   This function is broken and not what you're looking for.  It should only
 763                 ///   be used while the type is still being created since it doesn't use the cache
 764                 ///   and relies on the filter doing the member name check.
 765                 /// </remarks>
 766                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
 767                                                         MemberFilter filter, object criteria);
 768
 769                 /// <remarks>
 770                 ///   If we have a MemberCache, return it.  This property may return null if the
 771                 ///   class doesn't have a member cache or while it's still being created.
 772                 /// </remarks>
 773                 public abstract MemberCache MemberCache {
 774                         get;
 775                 }
 776
 777                 //
 778                 // Extensions for generics
 779                 //
 780                 ArrayList type_parameter_list;
 781
 782                 ///
 783                 /// Called by the parser to configure the type_parameter_list for this
 784                 /// declaration space
 785                 ///
 786                 public AdditionResult SetParameterInfo (ArrayList type_parameter_list, object constraints)
 787                 {
 788                         this.type_parameter_list = type_parameter_list;
 789
 790                         //
 791                         // Mark this type as Generic
 792                         //
 793                         IsGeneric = true;
 794
 795                         //
 796                         // Register all the names
 797                         //
 798                         foreach (string type_parameter in type_parameter_list){
 799                                 AdditionResult res = IsValid (type_parameter, type_parameter);
 800
 801                                 if (res != AdditionResult.Success)
 802                                         return res;
 803
 804                                 DefineName (type_parameter, GetGenericData ());
 805                         }
 806
 807                         return AdditionResult.Success;
 808                 }
 809
 810                 //
 811                 // This is just something to flag the defined names for now
 812                 //
 813                 const int GENERIC_COOKIE = 20;
 814                 static object generic_flag = GENERIC_COOKIE;
 815
 816                 static object GetGenericData ()
 817                 {
 818                         return generic_flag;
 819                 }
 820
 821                 /// <summary>
 822                 ///   Returns a GenericTypeExpr if `name' refers to a type parameter
 823                 /// </summary>
 824                 public TypeParameterExpr LookupGeneric (string name, Location l)
 825                 {
 826                         foreach (string type_parameter in type_parameter_list){
 827                                 Console.WriteLine ("   trying: " + type_parameter);
 828                                 if (name == type_parameter)
 829                                         return new TypeParameterExpr (name, l);
 830                         }
 831
 832                         return null;
 833                 }
 834         }
 835
 836         /// <summary>
 837         ///   This is a readonly list of MemberInfo's.
 838         /// </summary>
 839         public class MemberList : IList {
 840                 public readonly IList List;
 841                 int count;
 842
 843                 /// <summary>
 844                 ///   Create a new MemberList from the given IList.
 845                 /// </summary>
 846                 public MemberList (IList list)
 847                 {
 848                         if (list != null)
 849                                 this.List = list;
 850                         else
 851                                 this.List = new ArrayList ();
 852                         count = List.Count;
 853                 }
 854
 855                 /// <summary>
 856                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
 857                 /// </summary>
 858                 public MemberList (IList first, IList second)
 859                 {
 860                         ArrayList list = new ArrayList ();
 861                         list.AddRange (first);
 862                         list.AddRange (second);
 863                         count = list.Count;
 864                         List = list;
 865                 }
 866
 867                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
 868
 869                 /// <summary>
 870                 ///   Cast the MemberList into a MemberInfo[] array.
 871                 /// </summary>
 872                 /// <remarks>
 873                 ///   This is an expensive operation, only use it if it's really necessary.
 874                 /// </remarks>
 875                 public static explicit operator MemberInfo [] (MemberList list)
 876                 {
 877                         Timer.StartTimer (TimerType.MiscTimer);
 878                         MemberInfo [] result = new MemberInfo [list.Count];
 879                         list.CopyTo (result, 0);
 880                         Timer.StopTimer (TimerType.MiscTimer);
 881                         return result;
 882                 }
 883
 884                 // ICollection
 885
 886                 public int Count {
 887                         get {
 888                                 return count;
 889                         }
 890                 }
 891
 892                 public bool IsSynchronized {
 893                         get {
 894                                 return List.IsSynchronized;
 895                         }
 896                 }
 897
 898                 public object SyncRoot {
 899                         get {
 900                                 return List.SyncRoot;
 901                         }
 902                 }
 903
 904                 public void CopyTo (Array array, int index)
 905                 {
 906                         List.CopyTo (array, index);
 907                 }
 908
 909                 // IEnumerable
 910
 911                 public IEnumerator GetEnumerator ()
 912                 {
 913                         return List.GetEnumerator ();
 914                 }
 915
 916                 // IList
 917
 918                 public bool IsFixedSize {
 919                         get {
 920                                 return true;
 921                         }
 922                 }
 923
 924                 public bool IsReadOnly {
 925                         get {
 926                                 return true;
 927                         }
 928                 }
 929
 930                 object IList.this [int index] {
 931                         get {
 932                                 return List [index];
 933                         }
 934
 935                         set {
 936                                 throw new NotSupportedException ();
 937                         }
 938                 }
 939
 940                 // FIXME: try to find out whether we can avoid the cast in this indexer.
 941                 public MemberInfo this [int index] {
 942                         get {
 943                                 return (MemberInfo) List [index];
 944                         }
 945                 }
 946
 947                 public int Add (object value)
 948                 {
 949                         throw new NotSupportedException ();
 950                 }
 951
 952                 public void Clear ()
 953                 {
 954                         throw new NotSupportedException ();
 955                 }
 956
 957                 public bool Contains (object value)
 958                 {
 959                         return List.Contains (value);
 960                 }
 961
 962                 public int IndexOf (object value)
 963                 {
 964                         return List.IndexOf (value);
 965                 }
 966
 967                 public void Insert (int index, object value)
 968                 {
 969                         throw new NotSupportedException ();
 970                 }
 971
 972                 public void Remove (object value)
 973                 {
 974                         throw new NotSupportedException ();
 975                 }
 976
 977                 public void RemoveAt (int index)
 978                 {
 979                         throw new NotSupportedException ();
 980                 }
 981         }
 982
 983         /// <summary>
 984         ///   This interface is used to get all members of a class when creating the
 985         ///   member cache.  It must be implemented by all DeclSpace derivatives which
 986         ///   want to support the member cache and by TypeHandle to get caching of
 987         ///   non-dynamic types.
 988         /// </summary>
 989         public interface IMemberContainer {
 990                 /// <summary>
 991                 ///   The name of the IMemberContainer.  This is only used for
 992                 ///   debugging purposes.
 993                 /// </summary>
 994                 string Name {
 995                         get;
 996                 }
 997
 998                 /// <summary>
 999                 ///   The type of this IMemberContainer.
1000                 /// </summary>
1001                 Type Type {
1002                         get;
1003                 }
1004
1005                 /// <summary>
1006                 ///   Returns the IMemberContainer of the parent class or null if this
1007                 ///   is an interface or TypeManger.object_type.
1008                 ///   This is used when creating the member cache for a class to get all
1009                 ///   members from the parent class.
1010                 /// </summary>
1011                 IMemberContainer Parent {
1012                         get;
1013                 }
1014
1015                 /// <summary>
1016                 ///   Whether this is an interface.
1017                 /// </summary>
1018                 bool IsInterface {
1019                         get;
1020                 }
1021
1022                 /// <summary>
1023                 ///   Returns all members of this class with the corresponding MemberTypes
1024                 ///   and BindingFlags.
1025                 /// </summary>
1026                 /// <remarks>
1027                 ///   When implementing this method, make sure not to return any inherited
1028                 ///   members and check the MemberTypes and BindingFlags properly.
1029                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1030                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1031                 ///   MemberInfo class, but the cache needs this information.  That's why
1032                 ///   this method is called multiple times with different BindingFlags.
1033                 /// </remarks>
1034                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1035
1036                 /// <summary>
1037                 ///   Return the container's member cache.
1038                 /// </summary>
1039                 MemberCache MemberCache {
1040                         get;
1041                 }
1042         }
1043
1044         /// <summary>
1045         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1046         ///   member lookups.  It has a member name based hash table; it maps each member
1047         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1048         ///   and the BindingFlags that were initially used to get it.  The cache contains
1049         ///   all members of the current class and all inherited members.  If this cache is
1050         ///   for an interface types, it also contains all inherited members.
1051         ///
1052         ///   There are two ways to get a MemberCache:
1053         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1054         ///     use the DeclSpace.MemberCache property.
1055         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1056         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1057         /// </summary>
1058         public class MemberCache {
1059                 public readonly IMemberContainer Container;
1060                 protected Hashtable member_hash;
1061                 protected Hashtable method_hash;
1062                 protected Hashtable interface_hash;
1063
1064                 /// <summary>
1065                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1066                 /// </summary>
1067                 public MemberCache (IMemberContainer container)
1068                 {
1069                         this.Container = container;
1070
1071                         Timer.IncrementCounter (CounterType.MemberCache);
1072                         Timer.StartTimer (TimerType.CacheInit);
1073
1074                         interface_hash = new Hashtable ();
1075
1076                         // If we have a parent class (we have a parent class unless we're
1077                         // TypeManager.object_type), we deep-copy its MemberCache here.
1078                         if (Container.Parent != null) {
1079                                 member_hash = SetupCache (Container.Parent.MemberCache);
1080                         } else if (Container.IsInterface)
1081                                 member_hash = SetupCacheForInterface ();
1082                         else
1083                                 member_hash = new Hashtable ();
1084
1085                         // If this is neither a dynamic type nor an interface, create a special
1086                         // method cache with all declared and inherited methods.
1087                         Type type = container.Type;
1088                         if (!(type is TypeBuilder) && !type.IsInterface) {
1089                                 method_hash = new Hashtable ();
1090                                 AddMethods (type);
1091                         }
1092
1093                         // Add all members from the current class.
1094                         AddMembers (Container);
1095
1096                         Timer.StopTimer (TimerType.CacheInit);
1097                 }
1098
1099                 /// <summary>
1100                 ///   Bootstrap this member cache by doing a deep-copy of our parent.
1101                 /// </summary>
1102                 Hashtable SetupCache (MemberCache parent)
1103                 {
1104                         Hashtable hash = new Hashtable ();
1105
1106                         IDictionaryEnumerator it = parent.member_hash.GetEnumerator ();
1107                         while (it.MoveNext ()) {
1108                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1109                         }
1110
1111                         return hash;
1112                 }
1113
1114                 void AddInterfaces (MemberCache parent)
1115                 {
1116                         foreach (Type iface in parent.interface_hash.Keys) {
1117                                 if (!interface_hash.Contains (iface))
1118                                         interface_hash.Add (iface, true);
1119                         }
1120                 }
1121
1122                 /// <summary>
1123                 ///   Add the contents of `new_hash' to `hash'.
1124                 /// </summary>
1125                 void AddHashtable (Hashtable hash, Hashtable new_hash)
1126                 {
1127                         IDictionaryEnumerator it = new_hash.GetEnumerator ();
1128                         while (it.MoveNext ()) {
1129                                 ArrayList list = (ArrayList) hash [it.Key];
1130                                 if (list != null)
1131                                         list.AddRange ((ArrayList) it.Value);
1132                                 else
1133                                         hash [it.Key] = ((ArrayList) it.Value).Clone ();
1134                         }
1135                 }
1136
1137                 /// <summary>
1138                 ///   Bootstrap the member cache for an interface type.
1139                 ///   Type.GetMembers() won't return any inherited members for interface types,
1140                 ///   so we need to do this manually.  Interfaces also inherit from System.Object.
1141                 /// </summary>
1142                 Hashtable SetupCacheForInterface ()
1143                 {
1144                         Hashtable hash = SetupCache (TypeHandle.ObjectType.MemberCache);
1145                         Type [] ifaces = TypeManager.GetInterfaces (Container.Type);
1146
1147                         foreach (Type iface in ifaces) {
1148                                 if (interface_hash.Contains (iface))
1149                                         continue;
1150                                 interface_hash.Add (iface, true);
1151
1152                                 IMemberContainer iface_container =
1153                                         TypeManager.LookupMemberContainer (iface);
1154
1155                                 MemberCache iface_cache = iface_container.MemberCache;
1156                                 AddHashtable (hash, iface_cache.member_hash);
1157                                 AddInterfaces (iface_cache);
1158                         }
1159
1160                         return hash;
1161                 }
1162
1163                 /// <summary>
1164                 ///   Add all members from class `container' to the cache.
1165                 /// </summary>
1166                 void AddMembers (IMemberContainer container)
1167                 {
1168                         // We need to call AddMembers() with a single member type at a time
1169                         // to get the member type part of CacheEntry.EntryType right.
1170                         AddMembers (MemberTypes.Constructor, container);
1171                         AddMembers (MemberTypes.Field, container);
1172                         AddMembers (MemberTypes.Method, container);
1173                         AddMembers (MemberTypes.Property, container);
1174                         AddMembers (MemberTypes.Event, container);
1175                         // Nested types are returned by both Static and Instance searches.
1176                         AddMembers (MemberTypes.NestedType,
1177                                     BindingFlags.Static | BindingFlags.Public, container);
1178                         AddMembers (MemberTypes.NestedType,
1179                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1180                 }
1181
1182                 void AddMembers (MemberTypes mt, IMemberContainer container)
1183                 {
1184                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1185                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1186                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1187                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1188                 }
1189
1190                 /// <summary>
1191                 ///   Add all members from class `container' with the requested MemberTypes and
1192                 ///   BindingFlags to the cache.  This method is called multiple times with different
1193                 ///   MemberTypes and BindingFlags.
1194                 /// </summary>
1195                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1196                 {
1197                         MemberList members = container.GetMembers (mt, bf);
1198                         BindingFlags new_bf = (container == Container) ?
1199                                 bf | BindingFlags.DeclaredOnly : bf;
1200
1201                         foreach (MemberInfo member in members) {
1202                                 string name = member.Name;
1203
1204                                 // We use a name-based hash table of ArrayList's.
1205                                 ArrayList list = (ArrayList) member_hash [name];
1206                                 if (list == null) {
1207                                         list = new ArrayList ();
1208                                         member_hash.Add (name, list);
1209                                 }
1210
1211                                 // When this method is called for the current class, the list will
1212                                 // already contain all inherited members from our parent classes.
1213                                 // We cannot add new members in front of the list since this'd be an
1214                                 // expensive operation, that's why the list is sorted in reverse order
1215                                 // (ie. members from the current class are coming last).
1216                                 list.Add (new CacheEntry (container, member, mt, bf));
1217                         }
1218                 }
1219
1220                 /// <summary>
1221                 ///   Add all declared and inherited methods from class `type' to the method cache.
1222                 /// </summary>
1223                 void AddMethods (Type type)
1224                 {
1225                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1226                                     BindingFlags.FlattenHierarchy, type);
1227                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1228                                     BindingFlags.FlattenHierarchy, type);
1229                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1230                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1231                 }
1232
1233                 void AddMethods (BindingFlags bf, Type type)
1234                 {
1235                         MemberInfo [] members = type.GetMethods (bf);
1236
1237                         foreach (MethodBase member in members) {
1238                                 string name = member.Name;
1239
1240                                 // Varargs methods aren't allowed in C# code.
1241                                 if ((member.CallingConvention & CallingConventions.VarArgs) != 0)
1242                                         continue;
1243
1244                                 // We use a name-based hash table of ArrayList's.
1245                                 ArrayList list = (ArrayList) method_hash [name];
1246                                 if (list == null) {
1247                                         list = new ArrayList ();
1248                                         method_hash.Add (name, list);
1249                                 }
1250
1251                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1252                                 // sorted so we need to do this check for every member.
1253                                 BindingFlags new_bf = bf;
1254                                 if (member.DeclaringType == type)
1255                                         new_bf |= BindingFlags.DeclaredOnly;
1256
1257                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1258                         }
1259                 }
1260
1261                 /// <summary>
1262                 ///   Compute and return a appropriate `EntryType' magic number for the given
1263                 ///   MemberTypes and BindingFlags.
1264                 /// </summary>
1265                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1266                 {
1267                         EntryType type = EntryType.None;
1268
1269                         if ((mt & MemberTypes.Constructor) != 0)
1270                                 type |= EntryType.Constructor;
1271                         if ((mt & MemberTypes.Event) != 0)
1272                                 type |= EntryType.Event;
1273                         if ((mt & MemberTypes.Field) != 0)
1274                                 type |= EntryType.Field;
1275                         if ((mt & MemberTypes.Method) != 0)
1276                                 type |= EntryType.Method;
1277                         if ((mt & MemberTypes.Property) != 0)
1278                                 type |= EntryType.Property;
1279                         // Nested types are returned by static and instance searches.
1280                         if ((mt & MemberTypes.NestedType) != 0)
1281                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1282
1283                         if ((bf & BindingFlags.Instance) != 0)
1284                                 type |= EntryType.Instance;
1285                         if ((bf & BindingFlags.Static) != 0)
1286                                 type |= EntryType.Static;
1287                         if ((bf & BindingFlags.Public) != 0)
1288                                 type |= EntryType.Public;
1289                         if ((bf & BindingFlags.NonPublic) != 0)
1290                                 type |= EntryType.NonPublic;
1291                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1292                                 type |= EntryType.Declared;
1293
1294                         return type;
1295                 }
1296
1297                 /// <summary>
1298                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1299                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1300                 ///   single member types.
1301                 /// </summary>
1302                 public static bool IsSingleMemberType (MemberTypes mt)
1303                 {
1304                         switch (mt) {
1305                         case MemberTypes.Constructor:
1306                         case MemberTypes.Event:
1307                         case MemberTypes.Field:
1308                         case MemberTypes.Method:
1309                         case MemberTypes.Property:
1310                         case MemberTypes.NestedType:
1311                                 return true;
1312
1313                         default:
1314                                 return false;
1315                         }
1316                 }
1317
1318                 /// <summary>
1319                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1320                 ///   number to speed up the searching process.
1321                 /// </summary>
1322                 [Flags]
1323                 protected enum EntryType {
1324                         None            = 0x000,
1325
1326                         Instance        = 0x001,
1327                         Static          = 0x002,
1328                         MaskStatic      = Instance|Static,
1329
1330                         Public          = 0x004,
1331                         NonPublic       = 0x008,
1332                         MaskProtection  = Public|NonPublic,
1333
1334                         Declared        = 0x010,
1335
1336                         Constructor     = 0x020,
1337                         Event           = 0x040,
1338                         Field           = 0x080,
1339                         Method          = 0x100,
1340                         Property        = 0x200,
1341                         NestedType      = 0x400,
1342
1343                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1344                 }
1345
1346                 protected struct CacheEntry {
1347                         public readonly IMemberContainer Container;
1348                         public readonly EntryType EntryType;
1349                         public readonly MemberInfo Member;
1350
1351                         public CacheEntry (IMemberContainer container, MemberInfo member,
1352                                            MemberTypes mt, BindingFlags bf)
1353                         {
1354                                 this.Container = container;
1355                                 this.Member = member;
1356                                 this.EntryType = GetEntryType (mt, bf);
1357                         }
1358                 }
1359
1360                 /// <summary>
1361                 ///   This is called each time we're walking up one level in the class hierarchy
1362                 ///   and checks whether we can abort the search since we've already found what
1363                 ///   we were looking for.
1364                 /// </summary>
1365                 protected bool DoneSearching (ArrayList list)
1366                 {
1367                         //
1368                         // We've found exactly one member in the current class and it's not
1369                         // a method or constructor.
1370                         //
1371                         if (list.Count == 1 && !(list [0] is MethodBase))
1372                                 return true;
1373
1374                         //
1375                         // Multiple properties: we query those just to find out the indexer
1376                         // name
1377                         //
1378                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1379                                 return true;
1380
1381                         return false;
1382                 }
1383
1384                 /// <summary>
1385                 ///   Looks up members with name `name'.  If you provide an optional
1386                 ///   filter function, it'll only be called with members matching the
1387                 ///   requested member name.
1388                 ///
1389                 ///   This method will try to use the cache to do the lookup if possible.
1390                 ///
1391                 ///   Unlike other FindMembers implementations, this method will always
1392                 ///   check all inherited members - even when called on an interface type.
1393                 ///
1394                 ///   If you know that you're only looking for methods, you should use
1395                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1396                 ///   When doing a method-only search, it'll try to use a special method
1397                 ///   cache (unless it's a dynamic type or an interface) and the returned
1398                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1399                 ///   The lookup process will automatically restart itself in method-only
1400                 ///   search mode if it discovers that it's about to return methods.
1401                 /// </summary>
1402                 public MemberList FindMembers (MemberTypes mt, BindingFlags bf, string name,
1403                                                MemberFilter filter, object criteria)
1404                 {
1405                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1406                         bool method_search = mt == MemberTypes.Method;
1407                         // If we have a method cache and we aren't already doing a method-only search,
1408                         // then we restart a method search if the first match is a method.
1409                         bool do_method_search = !method_search && (method_hash != null);
1410
1411                         ArrayList applicable;
1412
1413                         // If this is a method-only search, we try to use the method cache if
1414                         // possible; a lookup in the method cache will return a MemberInfo with
1415                         // the correct ReflectedType for inherited methods.
1416
1417                         if (method_search && (method_hash != null))
1418                                 applicable = (ArrayList) method_hash [name];
1419                         else
1420                                 applicable = (ArrayList) member_hash [name];
1421
1422                         if (applicable == null)
1423                                 return MemberList.Empty;
1424
1425                         //
1426                         // 32  slots gives 53 rss/54 size
1427                         // 2/4 slots gives 55 rss
1428                         //
1429                         // Strange: from 25,000 calls, only 1,800
1430                         // are above 2.  Why does this impact it?
1431                         //
1432                         ArrayList list = new ArrayList ();
1433
1434                         Timer.StartTimer (TimerType.CachedLookup);
1435
1436                         EntryType type = GetEntryType (mt, bf);
1437
1438                         IMemberContainer current = Container;
1439
1440                         // `applicable' is a list of all members with the given member name `name'
1441                         // in the current class and all its parent classes.  The list is sorted in
1442                         // reverse order due to the way how the cache is initialy created (to speed
1443                         // things up, we're doing a deep-copy of our parent).
1444
1445                         for (int i = applicable.Count-1; i >= 0; i--) {
1446                                 CacheEntry entry = (CacheEntry) applicable [i];
1447
1448                                 // This happens each time we're walking one level up in the class
1449                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
1450                                 // the first time this happens (this may already happen in the first
1451                                 // iteration of this loop if there are no members with the name we're
1452                                 // looking for in the current class).
1453                                 if (entry.Container != current) {
1454                                         if (declared_only || DoneSearching (list))
1455                                                 break;
1456
1457                                         current = entry.Container;
1458                                 }
1459
1460                                 // Is the member of the correct type ?
1461                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
1462                                         continue;
1463
1464                                 // Is the member static/non-static ?
1465                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
1466                                         continue;
1467
1468                                 // Apply the filter to it.
1469                                 if (filter (entry.Member, criteria)) {
1470                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
1471                                                 do_method_search = false;
1472                                         list.Add (entry.Member);
1473                                 }
1474                         }
1475
1476                         Timer.StopTimer (TimerType.CachedLookup);
1477
1478                         // If we have a method cache and we aren't already doing a method-only
1479                         // search, we restart in method-only search mode if the first match is
1480                         // a method.  This ensures that we return a MemberInfo with the correct
1481                         // ReflectedType for inherited methods.
1482                         if (do_method_search && (list.Count > 0)){
1483                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
1484                         }
1485
1486                         return new MemberList (list);
1487                 }
1488         }
1489 }