mcs/gmcs/interface.cs

   1 //
   2 // interface.cs: Interface handler
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //
   6 // Licensed under the terms of the GNU GPL
   7 //
   8 // (C) 2001 Ximian, Inc (http://www.ximian.com)
   9 //
  10 #define CACHE
  11 using System.Collections;
  12 using System;
  13 using System.IO;
  14 using System.Reflection;
  15 using System.Reflection.Emit;
  16
  17 namespace Mono.CSharp {
  18
  19         /// <summary>
  20         ///   Interfaces
  21         /// </summary>
  22         public class Interface : DeclSpace, IMemberContainer {
  23                 const MethodAttributes interface_method_attributes =
  24                         MethodAttributes.Public |
  25                         MethodAttributes.Abstract |
  26                         MethodAttributes.HideBySig |
  27                         MethodAttributes.NewSlot |
  28                         MethodAttributes.Virtual;
  29
  30                 const MethodAttributes property_attributes =
  31                         MethodAttributes.Public |
  32                         MethodAttributes.Abstract |
  33                         MethodAttributes.HideBySig |
  34                         MethodAttributes.NewSlot |
  35                         MethodAttributes.SpecialName |
  36                         MethodAttributes.Virtual;
  37
  38                 ArrayList bases;
  39
  40                 ArrayList defined_method;
  41                 ArrayList defined_indexer;
  42                 ArrayList defined_events;
  43                 ArrayList defined_properties;
  44
  45                 ArrayList method_builders;
  46                 ArrayList property_builders;
  47                 ArrayList event_builders;
  48
  49                 Attributes OptAttributes;
  50
  51                 public string IndexerName;
  52
  53                 IMemberContainer parent_container;
  54                 MemberCache member_cache;
  55
  56                 bool members_defined;
  57
  58                 // These will happen after the semantic analysis
  59
  60                 // Hashtable defined_indexers;
  61                 // Hashtable defined_methods;
  62
  63                 /// <summary>
  64                 ///   Modifiers allowed in a class declaration
  65                 /// </summary>
  66                 public const int AllowedModifiers =
  67                         Modifiers.NEW       |
  68                         Modifiers.PUBLIC    |
  69                         Modifiers.PROTECTED |
  70                         Modifiers.INTERNAL  |
  71                         Modifiers.UNSAFE    |
  72                         Modifiers.PRIVATE;
  73
  74                 public Interface (NamespaceEntry ns, TypeContainer parent, string name, int mod,
  75                                   Attributes attrs, Location l)
  76                         : base (ns, parent, name, l)
  77                 {
  78                         ModFlags = Modifiers.Check (AllowedModifiers, mod, Modifiers.PRIVATE, l);
  79                         OptAttributes = attrs;
  80
  81                         method_builders = new ArrayList ();
  82                         property_builders = new ArrayList ();
  83                         event_builders = new ArrayList ();
  84                 }
  85
  86                 public AdditionResult AddMethod (InterfaceMethod imethod)
  87                 {
  88                         string name = imethod.Name;
  89                         Object value = defined_names [name];
  90
  91                         if (value != null){
  92                                 if (!(value is InterfaceMethod))
  93                                         return AdditionResult.NameExists;
  94                         }
  95
  96                         if (defined_method == null)
  97                                 defined_method = new ArrayList ();
  98
  99                         defined_method.Add (imethod);
 100                         if (value == null)
 101                                 DefineName (name, imethod);
 102
 103                         return AdditionResult.Success;
 104                 }
 105
 106                 public AdditionResult AddProperty (InterfaceProperty iprop)
 107                 {
 108                         AdditionResult res;
 109                         string name = iprop.Name;
 110
 111                         if ((res = IsValid (name, name)) != AdditionResult.Success)
 112                                 return res;
 113
 114                         DefineName (name, iprop);
 115
 116                         if (defined_properties == null)
 117                                 defined_properties = new ArrayList ();
 118
 119                         defined_properties.Add (iprop);
 120                         return AdditionResult.Success;
 121                 }
 122
 123                 public AdditionResult AddEvent (InterfaceEvent ievent)
 124                 {
 125                         string name = ievent.Name;
 126                         AdditionResult res;
 127
 128                         if ((res = IsValid (name, name)) != AdditionResult.Success)
 129                                 return res;
 130
 131                         DefineName (name, ievent);
 132
 133                         if (defined_events == null)
 134                                 defined_events = new ArrayList ();
 135
 136                         defined_events.Add (ievent);
 137                         return AdditionResult.Success;
 138                 }
 139
 140                 public bool AddIndexer (InterfaceIndexer iindexer)
 141                 {
 142                         if (defined_indexer == null)
 143                                 defined_indexer = new ArrayList ();
 144
 145                         defined_indexer.Add (iindexer);
 146                         return true;
 147                 }
 148
 149                 public ArrayList InterfaceMethods {
 150                         get {
 151                                 return defined_method;
 152                         }
 153                 }
 154
 155                 public ArrayList InterfaceProperties {
 156                         get {
 157                                 return defined_properties;
 158                         }
 159                 }
 160
 161                 public ArrayList InterfaceEvents {
 162                         get {
 163                                 return defined_events;
 164                         }
 165                 }
 166
 167                 public ArrayList InterfaceIndexers {
 168                         get {
 169                                 return defined_indexer;
 170                         }
 171                 }
 172
 173                 public ArrayList Bases {
 174                         get {
 175                                 return bases;
 176                         }
 177
 178                         set {
 179                                 bases = value;
 180                         }
 181                 }
 182
 183                 public virtual TypeAttributes InterfaceAttr {
 184                         get {
 185                                 TypeAttributes x = TypeAttributes.Interface | TypeAttributes.Abstract;
 186
 187                                 if (IsTopLevel == false) {
 188
 189                                         if ((ModFlags & Modifiers.PROTECTED) != 0
 190                                             && (ModFlags & Modifiers.INTERNAL) != 0)
 191                                                 x |= TypeAttributes.NestedFamORAssem;
 192                                         else if ((ModFlags & Modifiers.PROTECTED) != 0)
 193                                                 x |= TypeAttributes.NestedFamily;
 194                                         else if ((ModFlags & Modifiers.INTERNAL) != 0)
 195                                                 x |= TypeAttributes.NestedAssembly;
 196                                         else if ((ModFlags & Modifiers.PUBLIC) != 0)
 197                                                 x |= TypeAttributes.NestedPublic;
 198                                         else
 199                                                 x |= TypeAttributes.NestedPrivate;
 200                                 } else {
 201                                         if ((ModFlags & Modifiers.PUBLIC) != 0)
 202                                                 x |= TypeAttributes.Public;
 203                                         else if ((ModFlags & Modifiers.PRIVATE) != 0)
 204                                                 x |= TypeAttributes.NotPublic;
 205                                 }
 206
 207                                 if ((ModFlags & Modifiers.ABSTRACT) != 0)
 208                                         x |= TypeAttributes.Abstract;
 209
 210                                 if ((ModFlags & Modifiers.SEALED) != 0)
 211                                         x |= TypeAttributes.Sealed;
 212
 213                                 return x;
 214                         }
 215                 }
 216
 217                 void Error111 (InterfaceMemberBase ib)
 218                 {
 219                         Report.Error (
 220                                 111,
 221                                 "Interface `" + Name + "' already contains a definition with the " +
 222                                 "same return value and parameter types for member `" + ib.Name + "'");
 223                 }
 224
 225                 bool RegisterMethod (MethodBase mb, InternalParameters ip, Type [] types)
 226                 {
 227                         if (!TypeManager.RegisterMethod (mb, ip, types))
 228                                 return false;
 229
 230                         method_builders.Add (mb);
 231                         return true;
 232                 }
 233
 234                 //
 235                 // This might trigger a definition of the methods.  This happens only
 236                 // with Attributes, as Attribute classes are processed before interfaces.
 237                 // Ideally, we should make everything just define recursively in terms
 238                 // of its dependencies.
 239                 //
 240                 public MethodInfo [] GetMethods (TypeContainer container)
 241                 {
 242                         int n = 0;
 243
 244                         if (!members_defined){
 245                                 if (DefineMembers (container))
 246                                         n = method_builders.Count;
 247                         } else
 248                                 n = method_builders.Count;
 249
 250                         MethodInfo [] mi = new MethodInfo [n];
 251
 252                         method_builders.CopyTo (mi, 0);
 253
 254                         return mi;
 255                 }
 256
 257                 // Hack around System.Reflection as found everywhere else
 258                 public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
 259                                                         MemberFilter filter, object criteria)
 260                 {
 261                         ArrayList members = new ArrayList ();
 262
 263                         if ((mt & MemberTypes.Method) != 0) {
 264                                 foreach (MethodBuilder mb in method_builders)
 265                                         if (filter (mb, criteria))
 266                                                 members.Add (mb);
 267                         }
 268
 269                         if ((mt & MemberTypes.Property) != 0) {
 270                                 foreach (PropertyBuilder pb in property_builders)
 271                                         if (filter (pb, criteria))
 272                                                 members.Add (pb);
 273                         }
 274
 275                         if ((mt & MemberTypes.Event) != 0) {
 276                                 foreach (MyEventBuilder eb in event_builders)
 277                                         if (filter (eb, criteria))
 278                                                 members.Add (eb);
 279                         }
 280
 281                         if (((bf & BindingFlags.DeclaredOnly) == 0) && (TypeBuilder.BaseType != null)) {
 282                                 MemberList parent_mi;
 283
 284                                 parent_mi = TypeContainer.FindMembers (
 285                                         TypeBuilder.BaseType, mt, bf, filter, criteria);
 286
 287                                 members.AddRange (parent_mi);
 288                         }
 289
 290                         return new MemberList (members);
 291                 }
 292
 293                 public override MemberCache MemberCache {
 294                         get {
 295                                 return member_cache;
 296                         }
 297                 }
 298
 299                 //
 300                 // Populates the methods in the interface
 301                 //
 302                 void PopulateMethod (TypeContainer parent, DeclSpace decl_space, InterfaceMethod im)
 303                 {
 304                         Type return_type = im.ReturnType.Type;
 305                         if (return_type == null)
 306                                 return_type = this.ResolveType (im.ReturnType, false, im.Location);
 307
 308                         Type [] arg_types = im.ParameterTypes (this);
 309                         MethodBuilder mb;
 310                         Parameter [] p;
 311                         int i;
 312
 313                         if (return_type == null)
 314                                 return;
 315
 316                         if (return_type.IsPointer && !UnsafeOK (this))
 317                                 return;
 318
 319                         if (arg_types == null)
 320                                 return;
 321
 322                         foreach (Type t in arg_types){
 323
 324                                 if (t == null)
 325                                         return;
 326
 327                                 if (t.IsPointer && !UnsafeOK (this))
 328                                         return;
 329                         }
 330
 331                         //
 332                         // Create the method
 333                         //
 334                         mb = TypeBuilder.DefineMethod (
 335                                 im.Name, interface_method_attributes,
 336                                 return_type, arg_types);
 337
 338                         InternalParameters ip = new InternalParameters (arg_types, im.Parameters);
 339
 340                         if (!RegisterMethod (mb, ip, arg_types)) {
 341                                 Error111 (im);
 342                                 return;
 343                         }
 344
 345                         //
 346                         // Define each type attribute (in/out/ref) and
 347                         // the argument names.
 348                         //
 349                         p = im.Parameters.FixedParameters;
 350                         if (p != null){
 351                                 for (i = 0; i < p.Length; i++)
 352                                         mb.DefineParameter (i + 1, p [i].Attributes, p [i].Name);
 353
 354                                 if (i != arg_types.Length)
 355                                         Console.WriteLine ("Implement the type definition for params");
 356                         }
 357
 358                         im.Builder = mb;
 359
 360                 }
 361
 362                 //
 363                 // Populates the properties in the interface
 364                 //
 365                 void PopulateProperty (TypeContainer parent, DeclSpace decl_space, InterfaceProperty ip)
 366                 {
 367                         PropertyBuilder pb;
 368                         MethodBuilder get = null, set = null;
 369                         ip.Type = this.ResolveTypeExpr (ip.Type, false, ip.Location);
 370                         if (ip.Type == null)
 371                                 return;
 372
 373                         Type prop_type = ip.Type.Type;
 374                         Type [] setter_args = new Type [1];
 375
 376                         if (prop_type == null)
 377                                 return;
 378
 379                         if (prop_type.IsPointer && !UnsafeOK (this))
 380                                 return;
 381
 382                         setter_args [0] = prop_type;
 383
 384                         //
 385                         // FIXME: properties are missing the following
 386                         // flags: hidebysig newslot specialname
 387                         //
 388                         pb = TypeBuilder.DefineProperty (
 389                                 ip.Name, PropertyAttributes.None,
 390                                 prop_type, null);
 391
 392                         if (ip.HasGet){
 393                                 get = TypeBuilder.DefineMethod (
 394                                         "get_" + ip.Name, property_attributes ,
 395                                         prop_type, null);
 396
 397                                 //
 398                                 // HACK because System.Reflection.Emit is lame
 399                                 //
 400                                 Type [] null_types = null;
 401                                 InternalParameters inp = new InternalParameters
 402                                         (null_types, Parameters.EmptyReadOnlyParameters);
 403
 404                                 if (!RegisterMethod (get, inp, null)) {
 405                                         Error111 (ip);
 406                                         return;
 407                                 }
 408
 409                                 pb.SetGetMethod (get);
 410                         }
 411
 412                         if (ip.HasSet){
 413                                 setter_args [0] = prop_type;
 414
 415                                 set = TypeBuilder.DefineMethod (
 416                                         "set_" + ip.Name, property_attributes,
 417                                         TypeManager.void_type, setter_args);
 418
 419                                 set.DefineParameter (1, ParameterAttributes.None, "value");
 420                                 pb.SetSetMethod (set);
 421
 422                                 //
 423                                 // HACK because System.Reflection.Emit is lame
 424                                 //
 425                                 Parameter [] parms = new Parameter [1];
 426                                 parms [0] = new Parameter (ip.Type, "value", Parameter.Modifier.NONE, null);
 427                                 InternalParameters ipp = new InternalParameters (
 428                                         this, new Parameters (parms, null, Location.Null));
 429
 430                                 if (!RegisterMethod (set, ipp, setter_args)) {
 431                                         Error111 (ip);
 432                                         return;
 433                                 }
 434                         }
 435
 436                         TypeManager.RegisterProperty (pb, get, set);
 437                         property_builders.Add (pb);
 438                         ip.Builder = pb;
 439                 }
 440
 441                 //
 442                 // Populates the events in the interface
 443                 //
 444                 void PopulateEvent (TypeContainer parent, DeclSpace decl_space, InterfaceEvent ie)
 445                 {
 446                         //
 447                         // FIXME: We need to do this after delegates have been
 448                         // declared or we declare them recursively.
 449                         //
 450                         MyEventBuilder eb;
 451                         MethodBuilder add = null, remove = null;
 452                         ie.Type = this.ResolveTypeExpr (ie.Type, false, ie.Location);
 453                         if (ie.Type == null)
 454                                 return;
 455
 456                         Type event_type = ie.Type.Type;
 457
 458                         if (event_type == null)
 459                                 return;
 460
 461                         if (event_type.IsPointer && !UnsafeOK (this))
 462                                 return;
 463
 464                         Type [] parameters = new Type [1];
 465                         parameters [0] = event_type;
 466
 467                         eb = new MyEventBuilder (null, TypeBuilder, ie.Name,
 468                                                  EventAttributes.None, event_type);
 469
 470                         //
 471                         // Now define the accessors
 472                         //
 473                         string add_name = "add_" + ie.Name;
 474
 475                         add = TypeBuilder.DefineMethod (
 476                                 add_name, property_attributes, null, parameters);
 477                         add.DefineParameter (1, ParameterAttributes.None, "value");
 478                         eb.SetAddOnMethod (add);
 479
 480                         string remove_name = "remove_" + ie.Name;
 481                         remove = TypeBuilder.DefineMethod (
 482                                 remove_name, property_attributes, null, parameters);
 483                         remove.DefineParameter (1, ParameterAttributes.None, "value");
 484                         eb.SetRemoveOnMethod (remove);
 485
 486                         Parameter [] parms = new Parameter [1];
 487                         parms [0] = new Parameter (ie.Type, "value", Parameter.Modifier.NONE, null);
 488                         InternalParameters ip = new InternalParameters (
 489                                 this, new Parameters (parms, null, Location.Null));
 490
 491                         if (!RegisterMethod (add, ip, parameters)) {
 492                                 Error111 (ie);
 493                                 return;
 494                         }
 495
 496                         if (!RegisterMethod (remove, ip, parameters)) {
 497                                 Error111 (ie);
 498                                 return;
 499                         }
 500
 501                         TypeManager.RegisterEvent (eb, add, remove);
 502                         event_builders.Add (eb);
 503
 504                         ie.Builder = eb;
 505                 }
 506
 507                 //
 508                 // Populates the indexers in the interface
 509                 //
 510                 void PopulateIndexer (TypeContainer parent, DeclSpace decl_space, InterfaceIndexer ii)
 511                 {
 512                         PropertyBuilder pb;
 513                         ii.Type = this.ResolveTypeExpr (ii.Type, false, ii.Location);
 514                         if (ii.Type == null)
 515                                 return;
 516
 517                         Type prop_type = ii.Type.Type;
 518                         Type [] arg_types = ii.ParameterTypes (this);
 519                         Type [] value_arg_types;
 520
 521                         if (prop_type == null)
 522                                 return;
 523
 524                         if (prop_type.IsPointer && !UnsafeOK (this))
 525                                 return;
 526
 527                         //
 528                         // Sets up the extra invisible `value' argument for setters.
 529                         //
 530                         if (arg_types != null){
 531                                 int count = arg_types.Length;
 532                                 value_arg_types = new Type [count + 1];
 533
 534                                 arg_types.CopyTo (value_arg_types, 0);
 535                                 value_arg_types [count] = prop_type;
 536
 537                                 foreach (Type t in arg_types){
 538                                         if (t.IsPointer && !UnsafeOK (this))
 539                                                 return;
 540                                 }
 541                         } else {
 542                                 value_arg_types = new Type [1];
 543
 544                                 value_arg_types [1] = prop_type;
 545                         }
 546
 547                         EmitContext ec = new EmitContext (parent, decl_space, Location, null,
 548                                                           null, ModFlags, false);
 549
 550                         IndexerName = Attribute.ScanForIndexerName (ec, ii.OptAttributes);
 551                         if (IndexerName == null)
 552                                 IndexerName = "Item";
 553
 554                         pb = TypeBuilder.DefineProperty (
 555                                 IndexerName, PropertyAttributes.None,
 556                                 prop_type, arg_types);
 557
 558                         MethodBuilder set_item = null, get_item = null;
 559                         if (ii.HasGet){
 560                                 Parameter [] p = ii.Parameters.FixedParameters;
 561
 562                                 get_item = TypeBuilder.DefineMethod (
 563                                         "get_" + IndexerName, property_attributes,
 564                                         prop_type, arg_types);
 565                                 pb.SetGetMethod (get_item);
 566                                 //
 567                                 // HACK because System.Reflection.Emit is lame
 568                                 //
 569                                 InternalParameters ip = new InternalParameters (
 570                                         arg_types, ii.Parameters);
 571
 572                                 if (!RegisterMethod (get_item, ip, arg_types)) {
 573                                         Error111 (ii);
 574                                         return;
 575                                 }
 576
 577                                 if (p != null){
 578                                         for (int i = 0; i < p.Length; i++)
 579                                                 get_item.DefineParameter (
 580                                                         i + 1,
 581                                                         p [i].Attributes, p [i].Name);
 582                                 }
 583                         }
 584
 585                         if (ii.HasSet){
 586                                 Parameter [] p = ii.Parameters.FixedParameters;
 587                                 Parameter [] pv;
 588                                 int i = 0;
 589
 590                                 pv = new Parameter [p.Length + 1];
 591                                 p.CopyTo (pv, 0);
 592                                 pv [p.Length] = new Parameter (ii.Type, "value", Parameter.Modifier.NONE, null);
 593                                 Parameters value_params = new Parameters (pv, null, Location.Null);
 594                                 value_params.GetParameterInfo (decl_space);
 595
 596                                 set_item = TypeBuilder.DefineMethod (
 597                                         "set_" + IndexerName, property_attributes,
 598                                         TypeManager.void_type, value_arg_types);
 599                                 pb.SetSetMethod (set_item);
 600                                 //
 601                                 // HACK because System.Reflection.Emit is lame
 602                                 //
 603                                 InternalParameters ip = new InternalParameters (
 604                                         value_arg_types, value_params);
 605                                 if (!RegisterMethod (set_item, ip, value_arg_types)) {
 606                                         Error111 (ii);
 607                                         return;
 608                                 }
 609
 610                                 if (p != null){
 611                                         for (; i < p.Length; i++)
 612                                                 set_item.DefineParameter (
 613                                                         i + 1,
 614                                                         p [i].Attributes, p [i].Name);
 615                                 }
 616
 617                                 set_item.DefineParameter (i + 1, ParameterAttributes.None, "value");
 618                         }
 619
 620                         property_builders.Add (pb);
 621
 622                         ii.Builder = pb;
 623                 }
 624
 625                 /// <summary>
 626                 ///   Performs the semantic analysis for all the interface members
 627                 ///   that were declared
 628                 /// </summary>
 629                 bool SemanticAnalysis ()
 630                 {
 631                         Hashtable methods = new Hashtable ();
 632
 633
 634                         if (defined_method != null){
 635                                 foreach (InterfaceMethod im in defined_method){
 636                                         string sig = im.GetSignature (this);
 637
 638                                         //
 639                                         // If there was an undefined Type on the signatures
 640                                         //
 641                                         if (sig == null)
 642                                                 continue;
 643
 644                                         if (methods [sig] != null){
 645                                                 Error111 (im);
 646                                                 return false;
 647                                         }
 648                                 }
 649                         }
 650
 651                         //
 652                         // FIXME: Here I should check i
 653                         //
 654                         return true;
 655                 }
 656
 657                 Type GetInterfaceTypeByName (Expression name)
 658                 {
 659                         Expression original = name;
 660                         name = ResolveTypeExpr (name, false, Location);
 661                         if (name == null)
 662                                 return null;
 663
 664                         Type t = name.Type;
 665
 666                         if (t.IsInterface)
 667                                 return t;
 668
 669                         string cause;
 670
 671                         if (t.IsValueType)
 672                                 cause = "is a struct";
 673                         else if (t.IsClass)
 674                                 cause = "is a class";
 675                         else
 676                                 cause = "Should not happen.";
 677
 678                         Report.Error (527, Location, "`"+name+"' " + cause +
 679                                       ", need an interface instead");
 680
 681                         return null;
 682                 }
 683
 684                 //
 685                 // Returns the list of interfaces that this interface implements
 686                 // Or null if it does not implement any interface.
 687                 //
 688                 // Sets the error boolean accoringly.
 689                 //
 690                 Type [] GetInterfaceBases (out bool error)
 691                 {
 692                         Type [] tbases;
 693                         int i;
 694
 695                         error = false;
 696                         if (Bases == null)
 697                                 return null;
 698
 699                         tbases = new Type [Bases.Count];
 700                         i = 0;
 701
 702                         foreach (Expression name in Bases){
 703                                 Type t;
 704
 705                                 t = GetInterfaceTypeByName (name);
 706                                 if (t == null){
 707                                         error = true;
 708                                         return null;
 709                                 }
 710
 711                                 if (!Parent.AsAccessible (t, ModFlags))
 712                                         Report.Error (61, Location,
 713                                                       "Inconsistent accessibility: base interface `" +
 714                                                       TypeManager.CSharpName (t) + "' is less " +
 715                                                       "accessible than interface `" +
 716                                                       Name + "'");
 717
 718                                 tbases [i++] = t;
 719                         }
 720
 721                         return TypeManager.ExpandInterfaces (tbases);
 722                 }
 723
 724                 //
 725                 // <summary>
 726                 //  Defines the Interface in the appropriate ModuleBuilder or TypeBuilder
 727                 // </summary>
 728                 //
 729                 // TODO:
 730                 //   Rework the way we recurse, because for recursive
 731                 //   definitions of interfaces (A:B and B:A) we report the
 732                 //   error twice, rather than once.
 733
 734                 public override TypeBuilder DefineType ()
 735                 {
 736                         Type [] ifaces;
 737                         bool error;
 738
 739                         if (TypeBuilder != null)
 740                                 return TypeBuilder;
 741
 742                         if (InTransit)
 743                                 return null;
 744
 745                         InTransit = true;
 746
 747                         ifaces = GetInterfaceBases (out error);
 748
 749                         if (error)
 750                                 return null;
 751
 752                         if (IsTopLevel) {
 753                                 if (TypeManager.NamespaceClash (Name, Location))
 754                                         return null;
 755
 756                                 ModuleBuilder builder = CodeGen.ModuleBuilder;
 757
 758                                 TypeBuilder = builder.DefineType (
 759                                         Name,
 760                                         InterfaceAttr,
 761                                         (Type)null,   // Parent Type
 762                                         ifaces);
 763                                 RootContext.RegisterOrder (this);
 764                         } else {
 765                                 TypeBuilder builder = Parent.TypeBuilder;
 766
 767                                 TypeBuilder = builder.DefineNestedType (
 768                                         Basename,
 769                                         InterfaceAttr,
 770                                         (Type) null, //parent type
 771                                         ifaces);
 772
 773                                 TypeContainer tc = TypeManager.LookupTypeContainer (builder);
 774                                 tc.RegisterOrder (this);
 775                         }
 776
 777                         TypeManager.AddUserInterface (Name, TypeBuilder, this, ifaces);
 778                         InTransit = false;
 779
 780                         return TypeBuilder;
 781                 }
 782
 783                 //
 784                 // Defines the indexers, and also verifies that the IndexerNameAttribute in the
 785                 // interface is consistent.  Either it is `Item' or it is the name defined by all the
 786                 // indexers with the `IndexerName' attribute.
 787                 //
 788                 // Turns out that the IndexerNameAttribute is applied to each indexer,
 789                 // but it is never emitted, instead a DefaultName attribute is attached
 790                 // to the interface
 791                 //
 792                 void DefineIndexers (TypeContainer parent)
 793                 {
 794                         string interface_indexer_name = null;
 795
 796                         foreach (InterfaceIndexer ii in defined_indexer){
 797
 798                                 PopulateIndexer (parent, this, ii);
 799
 800                                 if (interface_indexer_name == null){
 801                                         interface_indexer_name = IndexerName;
 802                                         continue;
 803                                 }
 804
 805                                 if (IndexerName == interface_indexer_name)
 806                                         continue;
 807
 808                                 Report.Error (
 809                                         668, "Two indexers have different names, " +
 810                                         " you should use the same name for all your indexers");
 811                         }
 812                         if (interface_indexer_name == null)
 813                                 interface_indexer_name = "Item";
 814                         IndexerName = interface_indexer_name;
 815                 }
 816
 817                 /// <summary>
 818                 ///   Performs semantic analysis, and then generates the IL interfaces
 819                 /// </summary>
 820                 public override bool DefineMembers (TypeContainer parent)
 821                 {
 822                         if (members_defined)
 823                                 return true;
 824
 825                         if (!SemanticAnalysis ())
 826                                 return false;
 827
 828
 829                         if (defined_method != null){
 830                                 foreach (InterfaceMethod im in defined_method)
 831                                         PopulateMethod (parent, this, im);
 832                         }
 833
 834                         if (defined_properties != null){
 835                                 foreach (InterfaceProperty ip in defined_properties)
 836                                         PopulateProperty (parent, this, ip);
 837                         }
 838
 839                         if (defined_events != null)
 840                                 foreach (InterfaceEvent ie in defined_events)
 841                                         PopulateEvent (parent, this, ie);
 842
 843                         if (defined_indexer != null) {
 844                                 DefineIndexers (parent);
 845
 846                                 CustomAttributeBuilder cb = EmitDefaultMemberAttr (
 847                                         parent, IndexerName, ModFlags, Location);
 848                                 if (cb != null)
 849                                         TypeBuilder.SetCustomAttribute (cb);
 850                         }
 851
 852 #if CACHE
 853                         if (TypeBuilder.BaseType != null)
 854                                 parent_container = TypeManager.LookupMemberContainer (TypeBuilder.BaseType);
 855
 856                         member_cache = new MemberCache (this);
 857 #endif
 858                         members_defined = true;
 859                         return true;
 860                 }
 861
 862
 863                 //
 864                 // In the case of Interfaces, there is nothing to do here
 865                 //
 866                 public override bool Define (TypeContainer parent)
 867                 {
 868                         return true;
 869                 }
 870
 871                 /// <summary>
 872                 ///   Applies all the attributes.
 873                 /// </summary>
 874                 public void Emit (TypeContainer tc)
 875                 {
 876                         if (OptAttributes != null) {
 877                                 EmitContext ec = new EmitContext (tc, this, Location, null, null,
 878                                                                   ModFlags, false);
 879                                 Attribute.ApplyAttributes (ec, TypeBuilder, this, OptAttributes);
 880                         }
 881
 882                         // Now emit attributes for each interface member
 883                         if (defined_method != null) {
 884                                 foreach (InterfaceMethod im in defined_method) {
 885                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 886                                                                           im.ReturnType.Type, ModFlags, false);
 887
 888                                         if (im.OptAttributes != null)
 889                                                 Attribute.ApplyAttributes (ec, im.Builder, im, im.OptAttributes);
 890                                 }
 891                         }
 892
 893                         if (defined_properties != null) {
 894                                 foreach (InterfaceProperty ip in defined_properties) {
 895                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 896                                                                           null, ModFlags, false);
 897
 898                                         if (ip.OptAttributes != null)
 899                                                 Attribute.ApplyAttributes (ec, ip.Builder, ip, ip.OptAttributes);
 900                                 }
 901                         }
 902
 903                         if (defined_events != null) {
 904                                 foreach (InterfaceEvent ie in defined_events) {
 905                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 906                                                                           null, ModFlags, false);
 907
 908                                         if (ie.OptAttributes != null)
 909                                                 Attribute.ApplyAttributes (ec, ie.Builder, ie, ie.OptAttributes);
 910                                 }
 911                         }
 912                 }
 913
 914                 public static CustomAttributeBuilder EmitDefaultMemberAttr (TypeContainer parent,
 915                                                                             string name,
 916                                                                             int flags,
 917                                                                             Location loc)
 918                 {
 919                         EmitContext ec = new EmitContext (parent, loc, null, null, flags);
 920
 921                         Expression ml = Expression.MemberLookup (ec, TypeManager.default_member_type,
 922                                                                  ".ctor", MemberTypes.Constructor,
 923                                                                  BindingFlags.Public | BindingFlags.Instance,
 924                                                                  Location.Null);
 925
 926                         if (!(ml is MethodGroupExpr)) {
 927                                 Console.WriteLine ("Internal error !!!!");
 928                                 return null;
 929                         }
 930
 931                         MethodGroupExpr mg = (MethodGroupExpr) ml;
 932
 933                         MethodBase constructor = mg.Methods [0];
 934
 935                         string [] vals = { name };
 936
 937                         CustomAttributeBuilder cb = null;
 938                         try {
 939                                 cb = new CustomAttributeBuilder ((ConstructorInfo) constructor, vals);
 940                         } catch {
 941                                 Report.Warning (-100, "Can not set the indexer default member attribute");
 942                         }
 943
 944                         return cb;
 945                 }
 946
 947                 //
 948                 // IMemberContainer
 949                 //
 950
 951                 string IMemberContainer.Name {
 952                         get {
 953                                 return Name;
 954                         }
 955                 }
 956
 957                 Type IMemberContainer.Type {
 958                         get {
 959                                 return TypeBuilder;
 960                         }
 961                 }
 962
 963                 IMemberContainer IMemberContainer.Parent {
 964                         get {
 965                                 return parent_container;
 966                         }
 967                 }
 968
 969                 MemberCache IMemberContainer.MemberCache {
 970                         get {
 971                                 return member_cache;
 972                         }
 973                 }
 974
 975                 bool IMemberContainer.IsInterface {
 976                         get {
 977                                 return true;
 978                         }
 979                 }
 980
 981                 MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
 982                 {
 983                         // Interfaces only contain instance members.
 984                         if ((bf & BindingFlags.Instance) == 0)
 985                                 return MemberList.Empty;
 986                         if ((bf & BindingFlags.Public) == 0)
 987                                 return MemberList.Empty;
 988
 989                         ArrayList members = new ArrayList ();
 990
 991                         if ((mt & MemberTypes.Method) != 0)
 992                                 members.AddRange (method_builders);
 993
 994                         if ((mt & MemberTypes.Property) != 0)
 995                                 members.AddRange (property_builders);
 996
 997                         if ((mt & MemberTypes.Event) != 0)
 998                                 members.AddRange (event_builders);
 999
1000                         return new MemberList (members);
1001                 }
1002         }
1003
1004         public class InterfaceMemberBase {
1005                 public readonly string Name;
1006                 public readonly bool IsNew;
1007                 public Attributes OptAttributes;
1008
1009                 public InterfaceMemberBase (string name, bool is_new, Attributes attrs)
1010                 {
1011                         Name = name;
1012                         IsNew = is_new;
1013                         OptAttributes = attrs;
1014                 }
1015         }
1016
1017         public class InterfaceProperty : InterfaceMemberBase {
1018                 public readonly bool HasSet;
1019                 public readonly bool HasGet;
1020                 public readonly Location Location;
1021                 public Expression Type;
1022                 public PropertyBuilder Builder;
1023
1024                 public InterfaceProperty (Expression type, string name,
1025                                           bool is_new, bool has_get, bool has_set,
1026                                           Attributes attrs, Location loc)
1027                         : base (name, is_new, attrs)
1028                 {
1029                         Type = type;
1030                         HasGet = has_get;
1031                         HasSet = has_set;
1032                         Location = loc;
1033                 }
1034         }
1035
1036         public class InterfaceEvent : InterfaceMemberBase {
1037                 public readonly Location Location;
1038                 public Expression Type;
1039                 public MyEventBuilder Builder;
1040
1041                 public InterfaceEvent (Expression type, string name, bool is_new, Attributes attrs,
1042                                        Location loc)
1043                         : base (name, is_new, attrs)
1044                 {
1045                         Type = type;
1046                         Location = loc;
1047                 }
1048         }
1049
1050         public class InterfaceMethod : InterfaceMemberBase {
1051                 public Expression ReturnType;
1052                 public readonly Parameters Parameters;
1053                 public readonly Location Location;
1054                 public MethodBuilder Builder;
1055
1056                 public InterfaceMethod (Expression return_type, string name, bool is_new, Parameters args,
1057                                         Attributes attrs, Location l)
1058                         : base (name, is_new, attrs)
1059                 {
1060                         this.ReturnType = return_type;
1061                         this.Parameters = args;
1062                         Location = l;
1063                 }
1064
1065                 /// <summary>
1066                 ///   Returns the signature for this interface method
1067                 /// </summary>
1068                 public string GetSignature (DeclSpace ds)
1069                 {
1070                         ReturnType = ds.ResolveTypeExpr (ReturnType, false, Location);
1071                         if (ReturnType == null)
1072                                 return null;
1073
1074                         Type ret = ReturnType.Type;
1075                         string args = Parameters.GetSignature (ds);
1076
1077                         if ((ret == null) || (args == null))
1078                                 return null;
1079
1080                         return (IsNew ? "new-" : "") + ret.FullName + "(" + args + ")";
1081                 }
1082
1083                 public Type [] ParameterTypes (DeclSpace ds)
1084                 {
1085                         return Parameters.GetParameterInfo (ds);
1086                 }
1087         }
1088
1089         public class InterfaceIndexer : InterfaceMemberBase {
1090                 public readonly bool HasGet, HasSet;
1091                 public readonly Parameters Parameters;
1092                 public readonly Location Location;
1093                 public Expression Type;
1094                 public PropertyBuilder Builder;
1095
1096                 public InterfaceIndexer (Expression type, Parameters args, bool do_get, bool do_set,
1097                                          bool is_new, Attributes attrs, Location loc)
1098                         : base ("", is_new, attrs)
1099                 {
1100                         Type = type;
1101                         Parameters = args;
1102                         HasGet = do_get;
1103                         HasSet = do_set;
1104                         Location = loc;
1105                 }
1106
1107                 public Type [] ParameterTypes (DeclSpace ds)
1108                 {
1109                         return Parameters.GetParameterInfo (ds);
1110                 }
1111         }
1112 }