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