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