mcs/gmcs/interface.cs

   1 //
   2 // interface.cs: Interface handler
   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 #define CACHE
  11 using System.Collections;
  12 using System;
  13 using System.IO;
  14 using System.Reflection;
  15 using System.Reflection.Emit;
  16
  17 namespace Mono.CSharp {
  18
  19         /// <summary>
  20         ///   Interfaces
  21         /// </summary>
  22         public class Interface : DeclSpace, IMemberContainer {
  23                 const MethodAttributes interface_method_attributes =
  24                         MethodAttributes.Public |
  25                         MethodAttributes.Abstract |
  26                         MethodAttributes.HideBySig |
  27                         MethodAttributes.NewSlot |
  28                         MethodAttributes.Virtual;
  29
  30                 const MethodAttributes property_attributes =
  31                         MethodAttributes.Public |
  32                         MethodAttributes.Abstract |
  33                         MethodAttributes.HideBySig |
  34                         MethodAttributes.NewSlot |
  35                         MethodAttributes.SpecialName |
  36                         MethodAttributes.Virtual;
  37
  38                 ArrayList bases;
  39
  40                 ArrayList defined_method;
  41                 ArrayList defined_indexer;
  42                 ArrayList defined_events;
  43                 ArrayList defined_properties;
  44
  45                 ArrayList method_builders;
  46                 ArrayList property_builders;
  47                 ArrayList event_builders;
  48
  49                 Attributes OptAttributes;
  50
  51                 public string IndexerName;
  52
  53                 IMemberContainer parent_container;
  54                 MemberCache member_cache;
  55
  56                 bool members_defined;
  57
  58                 // These will happen after the semantic analysis
  59
  60                 // Hashtable defined_indexers;
  61                 // Hashtable defined_methods;
  62
  63                 /// <summary>
  64                 ///   Modifiers allowed in a class declaration
  65                 /// </summary>
  66                 public const int AllowedModifiers =
  67                         Modifiers.NEW       |
  68                         Modifiers.PUBLIC    |
  69                         Modifiers.PROTECTED |
  70                         Modifiers.INTERNAL  |
  71                         Modifiers.UNSAFE    |
  72                         Modifiers.PRIVATE;
  73
  74                 public Interface (NamespaceEntry ns, TypeContainer parent, string name, int mod,
  75                                   Attributes attrs, Location l)
  76                         : base (ns, parent, name, l)
  77                 {
  78                         ModFlags = Modifiers.Check (AllowedModifiers, mod, Modifiers.PRIVATE, l);
  79                         OptAttributes = attrs;
  80
  81                         method_builders = new ArrayList ();
  82                         property_builders = new ArrayList ();
  83                         event_builders = new ArrayList ();
  84                 }
  85
  86                 public AdditionResult AddMethod (InterfaceMethod imethod)
  87                 {
  88                         string name = imethod.Name;
  89                         Object value = defined_names [name];
  90
  91                         if (value != null){
  92                                 if (!(value is InterfaceMethod))
  93                                         return AdditionResult.NameExists;
  94                         }
  95
  96                         if (defined_method == null)
  97                                 defined_method = new ArrayList ();
  98
  99                         defined_method.Add (imethod);
 100                         if (value == null)
 101                                 DefineName (name, imethod);
 102
 103                         return AdditionResult.Success;
 104                 }
 105
 106                 public AdditionResult AddProperty (InterfaceProperty iprop)
 107                 {
 108                         AdditionResult res;
 109                         string name = iprop.Name;
 110
 111                         if ((res = IsValid (name, name)) != AdditionResult.Success)
 112                                 return res;
 113
 114                         DefineName (name, iprop);
 115
 116                         if (defined_properties == null)
 117                                 defined_properties = new ArrayList ();
 118
 119                         defined_properties.Add (iprop);
 120                         return AdditionResult.Success;
 121                 }
 122
 123                 public AdditionResult AddEvent (InterfaceEvent ievent)
 124                 {
 125                         string name = ievent.Name;
 126                         AdditionResult res;
 127
 128                         if ((res = IsValid (name, name)) != AdditionResult.Success)
 129                                 return res;
 130
 131                         DefineName (name, ievent);
 132
 133                         if (defined_events == null)
 134                                 defined_events = new ArrayList ();
 135
 136                         defined_events.Add (ievent);
 137                         return AdditionResult.Success;
 138                 }
 139
 140                 public bool AddIndexer (InterfaceIndexer iindexer)
 141                 {
 142                         if (defined_indexer == null)
 143                                 defined_indexer = new ArrayList ();
 144
 145                         defined_indexer.Add (iindexer);
 146                         return true;
 147                 }
 148
 149                 public ArrayList InterfaceMethods {
 150                         get {
 151                                 return defined_method;
 152                         }
 153                 }
 154
 155                 public ArrayList InterfaceProperties {
 156                         get {
 157                                 return defined_properties;
 158                         }
 159                 }
 160
 161                 public ArrayList InterfaceEvents {
 162                         get {
 163                                 return defined_events;
 164                         }
 165                 }
 166
 167                 public ArrayList InterfaceIndexers {
 168                         get {
 169                                 return defined_indexer;
 170                         }
 171                 }
 172
 173                 public ArrayList Bases {
 174                         get {
 175                                 return bases;
 176                         }
 177
 178                         set {
 179                                 bases = value;
 180                         }
 181                 }
 182
 183                 public virtual TypeAttributes InterfaceAttr {
 184                         get {
 185                                 TypeAttributes x = TypeAttributes.Interface | TypeAttributes.Abstract;
 186
 187                                 if (IsTopLevel == false) {
 188
 189                                         if ((ModFlags & Modifiers.PROTECTED) != 0
 190                                             && (ModFlags & Modifiers.INTERNAL) != 0)
 191                                                 x |= TypeAttributes.NestedFamORAssem;
 192                                         else if ((ModFlags & Modifiers.PROTECTED) != 0)
 193                                                 x |= TypeAttributes.NestedFamily;
 194                                         else if ((ModFlags & Modifiers.INTERNAL) != 0)
 195                                                 x |= TypeAttributes.NestedAssembly;
 196                                         else if ((ModFlags & Modifiers.PUBLIC) != 0)
 197                                                 x |= TypeAttributes.NestedPublic;
 198                                         else
 199                                                 x |= TypeAttributes.NestedPrivate;
 200                                 } else {
 201                                         if ((ModFlags & Modifiers.PUBLIC) != 0)
 202                                                 x |= TypeAttributes.Public;
 203                                         else if ((ModFlags & Modifiers.PRIVATE) != 0)
 204                                                 x |= TypeAttributes.NotPublic;
 205                                 }
 206
 207                                 if ((ModFlags & Modifiers.ABSTRACT) != 0)
 208                                         x |= TypeAttributes.Abstract;
 209
 210                                 if ((ModFlags & Modifiers.SEALED) != 0)
 211                                         x |= TypeAttributes.Sealed;
 212
 213                                 return x;
 214                         }
 215                 }
 216
 217                 void Error111 (InterfaceMemberBase ib)
 218                 {
 219                         Report.Error (
 220                                 111,
 221                                 "Interface `" + Name + "' already contains a definition with the " +
 222                                 "same return value and parameter types for member `" + ib.Name + "'");
 223                 }
 224
 225                 bool RegisterMethod (MethodBase mb, InternalParameters ip, Type [] types)
 226                 {
 227                         if (!TypeManager.RegisterMethod (mb, ip, types))
 228                                 return false;
 229
 230                         method_builders.Add (mb);
 231                         return true;
 232                 }
 233
 234                 //
 235                 // This might trigger a definition of the methods.  This happens only
 236                 // with Attributes, as Attribute classes are processed before interfaces.
 237                 // Ideally, we should make everything just define recursively in terms
 238                 // of its dependencies.
 239                 //
 240                 public MethodInfo [] GetMethods (TypeContainer container)
 241                 {
 242                         int n = 0;
 243
 244                         if (!members_defined){
 245                                 if (DefineMembers (container))
 246                                         n = method_builders.Count;
 247                         } else
 248                                 n = method_builders.Count;
 249
 250                         MethodInfo [] mi = new MethodInfo [n];
 251
 252                         method_builders.CopyTo (mi, 0);
 253
 254                         return mi;
 255                 }
 256
 257                 // Hack around System.Reflection as found everywhere else
 258                 public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
 259                                                         MemberFilter filter, object criteria)
 260                 {
 261                         ArrayList members = new ArrayList ();
 262
 263                         if ((mt & MemberTypes.Method) != 0) {
 264                                 foreach (MethodBuilder mb in method_builders)
 265                                         if (filter (mb, criteria))
 266                                                 members.Add (mb);
 267                         }
 268
 269                         if ((mt & MemberTypes.Property) != 0) {
 270                                 foreach (PropertyBuilder pb in property_builders)
 271                                         if (filter (pb, criteria))
 272                                                 members.Add (pb);
 273                         }
 274
 275                         if ((mt & MemberTypes.Event) != 0) {
 276                                 foreach (MyEventBuilder eb in event_builders)
 277                                         if (filter (eb, criteria))
 278                                                 members.Add (eb);
 279                         }
 280
 281                         if (((bf & BindingFlags.DeclaredOnly) == 0) && (TypeBuilder.BaseType != null)) {
 282                                 MemberList parent_mi;
 283
 284                                 parent_mi = TypeContainer.FindMembers (
 285                                         TypeBuilder.BaseType, mt, bf, filter, criteria);
 286
 287                                 members.AddRange (parent_mi);
 288                         }
 289
 290                         return new MemberList (members);
 291                 }
 292
 293                 public override MemberCache MemberCache {
 294                         get {
 295                                 return member_cache;
 296                         }
 297                 }
 298
 299                 //
 300                 // Populates the methods in the interface
 301                 //
 302                 void PopulateMethod (TypeContainer parent, DeclSpace decl_space, InterfaceMethod im)
 303                 {
 304                         Type return_type = im.ReturnType.Type;
 305                         if (return_type == null)
 306                                 return_type = this.ResolveType (im.ReturnType, false, im.Location);
 307
 308                         Type [] arg_types = im.ParameterTypes (this);
 309                         MethodBuilder mb;
 310                         Parameter [] p;
 311                         int i;
 312
 313                         if (return_type == null)
 314                                 return;
 315
 316                         if (return_type.IsPointer && !UnsafeOK (this))
 317                                 return;
 318
 319                         if (arg_types == null)
 320                                 return;
 321
 322                         foreach (Type t in arg_types){
 323
 324                                 if (t == null)
 325                                         return;
 326
 327                                 if (t.IsPointer && !UnsafeOK (this))
 328                                         return;
 329                         }
 330
 331                         //
 332                         // Create the method
 333                         //
 334                         mb = TypeBuilder.DefineMethod (
 335                                 im.Name, interface_method_attributes,
 336                                 return_type, arg_types);
 337
 338                         InternalParameters ip = new InternalParameters (arg_types, im.Parameters);
 339
 340                         if (!RegisterMethod (mb, ip, arg_types)) {
 341                                 Error111 (im);
 342                                 return;
 343                         }
 344
 345                         //
 346                         // Labelling of parameters is taken care of
 347                         // during the Emit phase via
 348                         // MethodCore.LabelParameters method so I am
 349                         // removing the old code here.
 350                         //
 351
 352                         im.Builder = mb;
 353
 354                 }
 355
 356                 //
 357                 // Populates the properties in the interface
 358                 //
 359                 void PopulateProperty (TypeContainer parent, DeclSpace decl_space, InterfaceProperty ip)
 360                 {
 361                         PropertyBuilder pb;
 362                         MethodBuilder get = null, set = null;
 363                         ip.Type = this.ResolveTypeExpr (ip.Type, false, ip.Location);
 364                         if (ip.Type == null)
 365                                 return;
 366
 367                         Type prop_type = ip.Type.Type;
 368                         Type [] setter_args = new Type [1];
 369
 370                         if (prop_type == null)
 371                                 return;
 372
 373                         if (prop_type.IsPointer && !UnsafeOK (this))
 374                                 return;
 375
 376                         setter_args [0] = prop_type;
 377
 378                         //
 379                         // FIXME: properties are missing the following
 380                         // flags: hidebysig newslot specialname
 381                         //
 382                         pb = TypeBuilder.DefineProperty (
 383                                 ip.Name, PropertyAttributes.None,
 384                                 prop_type, null);
 385
 386                         if (ip.HasGet){
 387                                 get = TypeBuilder.DefineMethod (
 388                                         "get_" + ip.Name, property_attributes ,
 389                                         prop_type, null);
 390
 391                                 //
 392                                 // HACK because System.Reflection.Emit is lame
 393                                 //
 394                                 Type [] null_types = null;
 395                                 InternalParameters inp = new InternalParameters
 396                                         (null_types, Parameters.EmptyReadOnlyParameters);
 397
 398                                 if (!RegisterMethod (get, inp, null)) {
 399                                         Error111 (ip);
 400                                         return;
 401                                 }
 402
 403                                 pb.SetGetMethod (get);
 404                         }
 405
 406                         if (ip.HasSet){
 407                                 setter_args [0] = prop_type;
 408
 409                                 set = TypeBuilder.DefineMethod (
 410                                         "set_" + ip.Name, property_attributes,
 411                                         TypeManager.void_type, setter_args);
 412
 413                                 set.DefineParameter (1, ParameterAttributes.None, "value");
 414                                 pb.SetSetMethod (set);
 415
 416                                 //
 417                                 // HACK because System.Reflection.Emit is lame
 418                                 //
 419                                 Parameter [] parms = new Parameter [1];
 420                                 parms [0] = new Parameter (ip.Type, "value", Parameter.Modifier.NONE, null);
 421                                 InternalParameters ipp = new InternalParameters (
 422                                         this, new Parameters (parms, null, Location.Null));
 423
 424                                 if (!RegisterMethod (set, ipp, setter_args)) {
 425                                         Error111 (ip);
 426                                         return;
 427                                 }
 428                         }
 429
 430                         TypeManager.RegisterProperty (pb, get, set);
 431                         property_builders.Add (pb);
 432                         ip.Builder = pb;
 433                 }
 434
 435                 //
 436                 // Populates the events in the interface
 437                 //
 438                 void PopulateEvent (TypeContainer parent, DeclSpace decl_space, InterfaceEvent ie)
 439                 {
 440                         //
 441                         // FIXME: We need to do this after delegates have been
 442                         // declared or we declare them recursively.
 443                         //
 444                         MyEventBuilder eb;
 445                         MethodBuilder add = null, remove = null;
 446                         ie.Type = this.ResolveTypeExpr (ie.Type, false, ie.Location);
 447                         if (ie.Type == null)
 448                                 return;
 449
 450                         Type event_type = ie.Type.Type;
 451
 452                         if (event_type == null)
 453                                 return;
 454
 455                         if (event_type.IsPointer && !UnsafeOK (this))
 456                                 return;
 457
 458                         Type [] parameters = new Type [1];
 459                         parameters [0] = event_type;
 460
 461                         eb = new MyEventBuilder (null, TypeBuilder, ie.Name,
 462                                                  EventAttributes.None, event_type);
 463
 464                         //
 465                         // Now define the accessors
 466                         //
 467                         string add_name = "add_" + ie.Name;
 468
 469                         add = TypeBuilder.DefineMethod (
 470                                 add_name, property_attributes, null, parameters);
 471                         add.DefineParameter (1, ParameterAttributes.None, "value");
 472                         eb.SetAddOnMethod (add);
 473
 474                         string remove_name = "remove_" + ie.Name;
 475                         remove = TypeBuilder.DefineMethod (
 476                                 remove_name, property_attributes, null, parameters);
 477                         remove.DefineParameter (1, ParameterAttributes.None, "value");
 478                         eb.SetRemoveOnMethod (remove);
 479
 480                         Parameter [] parms = new Parameter [1];
 481                         parms [0] = new Parameter (ie.Type, "value", Parameter.Modifier.NONE, null);
 482                         InternalParameters ip = new InternalParameters (
 483                                 this, new Parameters (parms, null, Location.Null));
 484
 485                         if (!RegisterMethod (add, ip, parameters)) {
 486                                 Error111 (ie);
 487                                 return;
 488                         }
 489
 490                         if (!RegisterMethod (remove, ip, parameters)) {
 491                                 Error111 (ie);
 492                                 return;
 493                         }
 494
 495                         TypeManager.RegisterEvent (eb, add, remove);
 496                         event_builders.Add (eb);
 497
 498                         ie.Builder = eb;
 499                 }
 500
 501                 //
 502                 // Populates the indexers in the interface
 503                 //
 504                 void PopulateIndexer (TypeContainer parent, DeclSpace decl_space, InterfaceIndexer ii)
 505                 {
 506                         PropertyBuilder pb;
 507                         ii.Type = this.ResolveTypeExpr (ii.Type, false, ii.Location);
 508                         if (ii.Type == null)
 509                                 return;
 510
 511                         Type prop_type = ii.Type.Type;
 512                         Type [] arg_types = ii.ParameterTypes (this);
 513                         Type [] value_arg_types;
 514
 515                         if (prop_type == null)
 516                                 return;
 517
 518                         if (prop_type.IsPointer && !UnsafeOK (this))
 519                                 return;
 520
 521                         //
 522                         // Sets up the extra invisible `value' argument for setters.
 523                         //
 524                         if (arg_types != null){
 525                                 int count = arg_types.Length;
 526                                 value_arg_types = new Type [count + 1];
 527
 528                                 arg_types.CopyTo (value_arg_types, 0);
 529                                 value_arg_types [count] = prop_type;
 530
 531                                 foreach (Type t in arg_types){
 532                                         if (t.IsPointer && !UnsafeOK (this))
 533                                                 return;
 534                                 }
 535                         } else {
 536                                 value_arg_types = new Type [1];
 537
 538                                 value_arg_types [1] = prop_type;
 539                         }
 540
 541                         EmitContext ec = new EmitContext (parent, decl_space, Location, null,
 542                                                           null, ModFlags, false);
 543
 544                         IndexerName = Attribute.ScanForIndexerName (ec, ii.OptAttributes);
 545                         if (IndexerName == null)
 546                                 IndexerName = "Item";
 547
 548                         pb = TypeBuilder.DefineProperty (
 549                                 IndexerName, PropertyAttributes.None,
 550                                 prop_type, arg_types);
 551
 552                         MethodBuilder set_item = null, get_item = null;
 553                         if (ii.HasGet){
 554                                 Parameter [] p = ii.Parameters.FixedParameters;
 555
 556                                 get_item = TypeBuilder.DefineMethod (
 557                                         "get_" + IndexerName, property_attributes,
 558                                         prop_type, arg_types);
 559                                 pb.SetGetMethod (get_item);
 560                                 //
 561                                 // HACK because System.Reflection.Emit is lame
 562                                 //
 563                                 InternalParameters ip = new InternalParameters (
 564                                         arg_types, ii.Parameters);
 565
 566                                 if (!RegisterMethod (get_item, ip, arg_types)) {
 567                                         Error111 (ii);
 568                                         return;
 569                                 }
 570
 571                                 if (p != null){
 572                                         for (int i = 0; i < p.Length; i++)
 573                                                 get_item.DefineParameter (
 574                                                         i + 1,
 575                                                         p [i].Attributes, p [i].Name);
 576                                 }
 577                         }
 578
 579                         if (ii.HasSet){
 580                                 Parameter [] p = ii.Parameters.FixedParameters;
 581                                 Parameter [] pv;
 582                                 int i = 0;
 583
 584                                 pv = new Parameter [p.Length + 1];
 585                                 p.CopyTo (pv, 0);
 586                                 pv [p.Length] = new Parameter (ii.Type, "value", Parameter.Modifier.NONE, null);
 587                                 Parameters value_params = new Parameters (pv, null, Location.Null);
 588                                 value_params.GetParameterInfo (decl_space);
 589
 590                                 set_item = TypeBuilder.DefineMethod (
 591                                         "set_" + IndexerName, property_attributes,
 592                                         TypeManager.void_type, value_arg_types);
 593                                 pb.SetSetMethod (set_item);
 594                                 //
 595                                 // HACK because System.Reflection.Emit is lame
 596                                 //
 597                                 InternalParameters ip = new InternalParameters (
 598                                         value_arg_types, value_params);
 599                                 if (!RegisterMethod (set_item, ip, value_arg_types)) {
 600                                         Error111 (ii);
 601                                         return;
 602                                 }
 603
 604                                 if (p != null){
 605                                         for (; i < p.Length; i++)
 606                                                 set_item.DefineParameter (
 607                                                         i + 1,
 608                                                         p [i].Attributes, p [i].Name);
 609                                 }
 610
 611                                 set_item.DefineParameter (i + 1, ParameterAttributes.None, "value");
 612                         }
 613
 614                         property_builders.Add (pb);
 615
 616                         ii.Builder = pb;
 617                 }
 618
 619                 /// <summary>
 620                 ///   Performs the semantic analysis for all the interface members
 621                 ///   that were declared
 622                 /// </summary>
 623                 bool SemanticAnalysis ()
 624                 {
 625                         Hashtable methods = new Hashtable ();
 626
 627
 628                         if (defined_method != null){
 629                                 foreach (InterfaceMethod im in defined_method){
 630                                         string sig = im.GetSignature (this);
 631
 632                                         //
 633                                         // If there was an undefined Type on the signatures
 634                                         //
 635                                         if (sig == null)
 636                                                 continue;
 637
 638                                         if (methods [sig] != null){
 639                                                 Error111 (im);
 640                                                 return false;
 641                                         }
 642                                 }
 643                         }
 644
 645                         //
 646                         // FIXME: Here I should check i
 647                         //
 648                         return true;
 649                 }
 650
 651                 Type GetInterfaceTypeByName (Expression name)
 652                 {
 653                         Expression original = name;
 654                         name = ResolveTypeExpr (name, false, Location);
 655                         if (name == null)
 656                                 return null;
 657
 658                         Type t = name.Type;
 659
 660                         if (t.IsInterface)
 661                                 return t;
 662
 663                         string cause;
 664
 665                         if (t.IsValueType)
 666                                 cause = "is a struct";
 667                         else if (t.IsClass)
 668                                 cause = "is a class";
 669                         else
 670                                 cause = "Should not happen.";
 671
 672                         Report.Error (527, Location, "`"+name+"' " + cause +
 673                                       ", need an interface instead");
 674
 675                         return null;
 676                 }
 677
 678                 //
 679                 // Returns the list of interfaces that this interface implements
 680                 // Or null if it does not implement any interface.
 681                 //
 682                 // Sets the error boolean accoringly.
 683                 //
 684                 Type [] GetInterfaceBases (out bool error)
 685                 {
 686                         Type [] tbases;
 687                         int i;
 688
 689                         error = false;
 690                         if (Bases == null)
 691                                 return null;
 692
 693                         tbases = new Type [Bases.Count];
 694                         i = 0;
 695
 696                         foreach (Expression name in Bases){
 697                                 Type t;
 698
 699                                 t = GetInterfaceTypeByName (name);
 700                                 if (t == null){
 701                                         error = true;
 702                                         return null;
 703                                 }
 704
 705                                 if (!Parent.AsAccessible (t, ModFlags))
 706                                         Report.Error (61, Location,
 707                                                       "Inconsistent accessibility: base interface `" +
 708                                                       TypeManager.CSharpName (t) + "' is less " +
 709                                                       "accessible than interface `" +
 710                                                       Name + "'");
 711
 712                                 tbases [i++] = t;
 713                         }
 714
 715                         return TypeManager.ExpandInterfaces (tbases);
 716                 }
 717
 718                 //
 719                 // <summary>
 720                 //  Defines the Interface in the appropriate ModuleBuilder or TypeBuilder
 721                 // </summary>
 722                 //
 723                 // TODO:
 724                 //   Rework the way we recurse, because for recursive
 725                 //   definitions of interfaces (A:B and B:A) we report the
 726                 //   error twice, rather than once.
 727
 728                 public override TypeBuilder DefineType ()
 729                 {
 730                         Type [] ifaces;
 731                         bool error;
 732
 733                         if (TypeBuilder != null)
 734                                 return TypeBuilder;
 735
 736                         if (InTransit)
 737                                 return null;
 738
 739                         InTransit = true;
 740
 741                         ifaces = GetInterfaceBases (out error);
 742
 743                         if (error)
 744                                 return null;
 745
 746                         if (IsGeneric) {
 747                                 foreach (TypeParameter type_param in TypeParameters)
 748                                         if (!type_param.Resolve (this)) {
 749                                                 error = true;
 750                                                 return null;
 751                                         }
 752                         }
 753
 754                         if (IsTopLevel) {
 755                                 if (TypeManager.NamespaceClash (Name, Location))
 756                                         return null;
 757
 758                                 ModuleBuilder builder = CodeGen.ModuleBuilder;
 759
 760                                 TypeBuilder = builder.DefineType (
 761                                         Name,
 762                                         InterfaceAttr,
 763                                         (Type)null,   // Parent Type
 764                                         ifaces);
 765                                 RootContext.RegisterOrder (this);
 766                         } else {
 767                                 TypeBuilder builder = Parent.TypeBuilder;
 768
 769                                 TypeBuilder = builder.DefineNestedType (
 770                                         Basename,
 771                                         InterfaceAttr,
 772                                         (Type) null, //parent type
 773                                         ifaces);
 774
 775                                 TypeContainer tc = TypeManager.LookupTypeContainer (builder);
 776                                 tc.RegisterOrder (this);
 777                         }
 778
 779                         if (IsGeneric) {
 780                                 foreach (TypeParameter type_param in TypeParameters)
 781                                         type_param.Define (TypeBuilder);
 782                         }
 783
 784                         TypeManager.AddUserInterface (Name, TypeBuilder, this, ifaces);
 785                         InTransit = false;
 786
 787                         return TypeBuilder;
 788                 }
 789
 790                 //
 791                 // Defines the indexers, and also verifies that the IndexerNameAttribute in the
 792                 // interface is consistent.  Either it is `Item' or it is the name defined by all the
 793                 // indexers with the `IndexerName' attribute.
 794                 //
 795                 // Turns out that the IndexerNameAttribute is applied to each indexer,
 796                 // but it is never emitted, instead a DefaultName attribute is attached
 797                 // to the interface
 798                 //
 799                 void DefineIndexers (TypeContainer parent)
 800                 {
 801                         string interface_indexer_name = null;
 802
 803                         foreach (InterfaceIndexer ii in defined_indexer){
 804
 805                                 PopulateIndexer (parent, this, ii);
 806
 807                                 if (interface_indexer_name == null){
 808                                         interface_indexer_name = IndexerName;
 809                                         continue;
 810                                 }
 811
 812                                 if (IndexerName == interface_indexer_name)
 813                                         continue;
 814
 815                                 Report.Error (
 816                                         668, "Two indexers have different names, " +
 817                                         " you should use the same name for all your indexers");
 818                         }
 819                         if (interface_indexer_name == null)
 820                                 interface_indexer_name = "Item";
 821                         IndexerName = interface_indexer_name;
 822                 }
 823
 824                 /// <summary>
 825                 ///   Performs semantic analysis, and then generates the IL interfaces
 826                 /// </summary>
 827                 public override bool DefineMembers (TypeContainer parent)
 828                 {
 829                         if (members_defined)
 830                                 return true;
 831
 832                         if (!SemanticAnalysis ())
 833                                 return false;
 834
 835
 836                         if (defined_method != null){
 837                                 foreach (InterfaceMethod im in defined_method)
 838                                         PopulateMethod (parent, this, im);
 839                         }
 840
 841                         if (defined_properties != null){
 842                                 foreach (InterfaceProperty ip in defined_properties)
 843                                         PopulateProperty (parent, this, ip);
 844                         }
 845
 846                         if (defined_events != null)
 847                                 foreach (InterfaceEvent ie in defined_events)
 848                                         PopulateEvent (parent, this, ie);
 849
 850                         if (defined_indexer != null) {
 851                                 DefineIndexers (parent);
 852
 853                                 CustomAttributeBuilder cb = EmitDefaultMemberAttr (
 854                                         parent, IndexerName, ModFlags, Location);
 855                                 if (cb != null)
 856                                         TypeBuilder.SetCustomAttribute (cb);
 857                         }
 858
 859 #if CACHE
 860                         if (TypeBuilder.BaseType != null)
 861                                 parent_container = TypeManager.LookupMemberContainer (TypeBuilder.BaseType);
 862
 863                         member_cache = new MemberCache (this);
 864 #endif
 865                         members_defined = true;
 866                         return true;
 867                 }
 868
 869
 870                 //
 871                 // In the case of Interfaces, there is nothing to do here
 872                 //
 873                 public override bool Define (TypeContainer parent)
 874                 {
 875                         return true;
 876                 }
 877
 878                 /// <summary>
 879                 ///   Applies all the attributes.
 880                 /// </summary>
 881                 public void Emit (TypeContainer tc)
 882                 {
 883                         if (OptAttributes != null) {
 884                                 EmitContext ec = new EmitContext (tc, this, Location, null, null,
 885                                                                   ModFlags, false);
 886                                 Attribute.ApplyAttributes (ec, TypeBuilder, this, OptAttributes);
 887                         }
 888
 889                         // Now emit attributes for each interface member
 890                         if (defined_method != null) {
 891                                 foreach (InterfaceMethod im in defined_method) {
 892                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 893                                                                           im.ReturnType.Type, ModFlags, false);
 894
 895                                         MethodCore.LabelParameters (ec, im.Builder,
 896                                                                     im.Parameters,
 897                                                                     im.OptAttributes,
 898                                                                     Location);
 899
 900                                         if (im.OptAttributes != null)
 901                                                 Attribute.ApplyAttributes (ec, im.Builder,
 902                                                                            im, im.OptAttributes);
 903
 904                                 }
 905                         }
 906
 907                         if (defined_properties != null) {
 908                                 foreach (InterfaceProperty ip in defined_properties) {
 909                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 910                                                                           null, ModFlags, false);
 911
 912                                         if (ip.OptAttributes != null)
 913                                                 Attribute.ApplyAttributes (ec, ip.Builder, ip, ip.OptAttributes);
 914                                 }
 915                         }
 916
 917                         if (defined_events != null) {
 918                                 foreach (InterfaceEvent ie in defined_events) {
 919                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 920                                                                           null, ModFlags, false);
 921
 922                                         if (ie.OptAttributes != null)
 923                                                 Attribute.ApplyAttributes (ec, ie.Builder, ie, ie.OptAttributes);
 924                                 }
 925                         }
 926                 }
 927
 928                 public static CustomAttributeBuilder EmitDefaultMemberAttr (TypeContainer parent,
 929                                                                             string name,
 930                                                                             int flags,
 931                                                                             Location loc)
 932                 {
 933                         EmitContext ec = new EmitContext (parent, loc, null, null, flags);
 934
 935                         Expression ml = Expression.MemberLookup (ec, TypeManager.default_member_type,
 936                                                                  ".ctor", MemberTypes.Constructor,
 937                                                                  BindingFlags.Public | BindingFlags.Instance,
 938                                                                  Location.Null);
 939
 940                         if (!(ml is MethodGroupExpr)) {
 941                                 Console.WriteLine ("Internal error !!!!");
 942                                 return null;
 943                         }
 944
 945                         MethodGroupExpr mg = (MethodGroupExpr) ml;
 946
 947                         MethodBase constructor = mg.Methods [0];
 948
 949                         string [] vals = { name };
 950
 951                         CustomAttributeBuilder cb = null;
 952                         try {
 953                                 cb = new CustomAttributeBuilder ((ConstructorInfo) constructor, vals);
 954                         } catch {
 955                                 Report.Warning (-100, "Can not set the indexer default member attribute");
 956                         }
 957
 958                         return cb;
 959                 }
 960
 961                 //
 962                 // IMemberContainer
 963                 //
 964
 965                 string IMemberContainer.Name {
 966                         get {
 967                                 return Name;
 968                         }
 969                 }
 970
 971                 Type IMemberContainer.Type {
 972                         get {
 973                                 return TypeBuilder;
 974                         }
 975                 }
 976
 977                 IMemberContainer IMemberContainer.Parent {
 978                         get {
 979                                 return parent_container;
 980                         }
 981                 }
 982
 983                 MemberCache IMemberContainer.MemberCache {
 984                         get {
 985                                 return member_cache;
 986                         }
 987                 }
 988
 989                 bool IMemberContainer.IsInterface {
 990                         get {
 991                                 return true;
 992                         }
 993                 }
 994
 995                 MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
 996                 {
 997                         // Interfaces only contain instance members.
 998                         if ((bf & BindingFlags.Instance) == 0)
 999                                 return MemberList.Empty;
1000                         if ((bf & BindingFlags.Public) == 0)
1001                                 return MemberList.Empty;
1002
1003                         ArrayList members = new ArrayList ();
1004
1005                         if ((mt & MemberTypes.Method) != 0)
1006                                 members.AddRange (method_builders);
1007
1008                         if ((mt & MemberTypes.Property) != 0)
1009                                 members.AddRange (property_builders);
1010
1011                         if ((mt & MemberTypes.Event) != 0)
1012                                 members.AddRange (event_builders);
1013
1014                         return new MemberList (members);
1015                 }
1016         }
1017
1018         public class InterfaceMemberBase {
1019                 public readonly string Name;
1020                 public readonly bool IsNew;
1021                 public Attributes OptAttributes;
1022
1023                 public InterfaceMemberBase (string name, bool is_new, Attributes attrs)
1024                 {
1025                         Name = name;
1026                         IsNew = is_new;
1027                         OptAttributes = attrs;
1028                 }
1029         }
1030
1031         public class InterfaceProperty : InterfaceMemberBase {
1032                 public readonly bool HasSet;
1033                 public readonly bool HasGet;
1034                 public readonly Location Location;
1035                 public Expression Type;
1036                 public PropertyBuilder Builder;
1037
1038                 public InterfaceProperty (Expression type, string name,
1039                                           bool is_new, bool has_get, bool has_set,
1040                                           Attributes attrs, Location loc)
1041                         : base (name, is_new, attrs)
1042                 {
1043                         Type = type;
1044                         HasGet = has_get;
1045                         HasSet = has_set;
1046                         Location = loc;
1047                 }
1048         }
1049
1050         public class InterfaceEvent : InterfaceMemberBase {
1051                 public readonly Location Location;
1052                 public Expression Type;
1053                 public MyEventBuilder Builder;
1054
1055                 public InterfaceEvent (Expression type, string name, bool is_new, Attributes attrs,
1056                                        Location loc)
1057                         : base (name, is_new, attrs)
1058                 {
1059                         Type = type;
1060                         Location = loc;
1061                 }
1062         }
1063
1064         public class InterfaceMethod : InterfaceMemberBase {
1065                 public Expression ReturnType;
1066                 public readonly Parameters Parameters;
1067                 public readonly Location Location;
1068                 public MethodBuilder Builder;
1069
1070                 public InterfaceMethod (Expression return_type, string name, bool is_new, Parameters args,
1071                                         Attributes attrs, Location l)
1072                         : base (name, is_new, attrs)
1073                 {
1074                         this.ReturnType = return_type;
1075                         this.Parameters = args;
1076                         Location = l;
1077                 }
1078
1079                 /// <summary>
1080                 ///   Returns the signature for this interface method
1081                 /// </summary>
1082                 public string GetSignature (DeclSpace ds)
1083                 {
1084                         ReturnType = ds.ResolveTypeExpr (ReturnType, false, Location);
1085                         if (ReturnType == null)
1086                                 return null;
1087
1088                         Type ret = ReturnType.Type;
1089                         string args = Parameters.GetSignature (ds);
1090
1091                         if ((ret == null) || (args == null))
1092                                 return null;
1093
1094                         return (IsNew ? "new-" : "") + ret.FullName + "(" + args + ")";
1095                 }
1096
1097                 public Type [] ParameterTypes (DeclSpace ds)
1098                 {
1099                         return Parameters.GetParameterInfo (ds);
1100                 }
1101         }
1102
1103         public class InterfaceIndexer : InterfaceMemberBase {
1104                 public readonly bool HasGet, HasSet;
1105                 public readonly Parameters Parameters;
1106                 public readonly Location Location;
1107                 public Expression Type;
1108                 public PropertyBuilder Builder;
1109
1110                 public InterfaceIndexer (Expression type, Parameters args, bool do_get, bool do_set,
1111                                          bool is_new, Attributes attrs, Location loc)
1112                         : base ("", is_new, attrs)
1113                 {
1114                         Type = type;
1115                         Parameters = args;
1116                         HasGet = do_get;
1117                         HasSet = do_set;
1118                         Location = loc;
1119                 }
1120
1121                 public Type [] ParameterTypes (DeclSpace ds)
1122                 {
1123                         return Parameters.GetParameterInfo (ds);
1124                 }
1125         }
1126 }