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