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
  50                 public string IndexerName;
  51
  52                 IMemberContainer parent_container;
  53                 MemberCache member_cache;
  54
  55                 bool members_defined;
  56
  57                 // These will happen after the semantic analysis
  58
  59                 // Hashtable defined_indexers;
  60                 // Hashtable defined_methods;
  61
  62                 /// <summary>
  63                 ///   Modifiers allowed in a class declaration
  64                 /// </summary>
  65                 public const int AllowedModifiers =
  66                         Modifiers.NEW       |
  67                         Modifiers.PUBLIC    |
  68                         Modifiers.PROTECTED |
  69                         Modifiers.INTERNAL  |
  70                         Modifiers.UNSAFE    |
  71                         Modifiers.PRIVATE;
  72
  73                 public Interface (NamespaceEntry ns, TypeContainer parent, string name, int mod,
  74                                   Attributes attrs, Location l)
  75                         : base (ns, parent, name, attrs, l)
  76                 {
  77                         ModFlags = Modifiers.Check (AllowedModifiers, mod, Modifiers.PRIVATE, l);
  78
  79                         method_builders = new ArrayList ();
  80                         property_builders = new ArrayList ();
  81                         event_builders = new ArrayList ();
  82                 }
  83
  84                 public AdditionResult AddMethod (InterfaceMethod imethod)
  85                 {
  86                         string name = imethod.Name;
  87                         Object value = defined_names [name];
  88
  89                         if (value != null){
  90                                 if (!(value is InterfaceMethod))
  91                                         return AdditionResult.NameExists;
  92                         }
  93
  94                         if (defined_method == null)
  95                                 defined_method = new ArrayList ();
  96
  97                         defined_method.Add (imethod);
  98                         if (value == null)
  99                                 DefineName (name, imethod);
 100
 101                         return AdditionResult.Success;
 102                 }
 103
 104                 public AdditionResult AddProperty (InterfaceProperty iprop)
 105                 {
 106                         AdditionResult res;
 107                         string name = iprop.Name;
 108
 109                         if ((res = IsValid (name, name)) != AdditionResult.Success)
 110                                 return res;
 111
 112                         DefineName (name, iprop);
 113
 114                         if (defined_properties == null)
 115                                 defined_properties = new ArrayList ();
 116
 117                         defined_properties.Add (iprop);
 118                         return AdditionResult.Success;
 119                 }
 120
 121                 public AdditionResult AddEvent (InterfaceEvent ievent)
 122                 {
 123                         string name = ievent.Name;
 124                         AdditionResult res;
 125
 126                         if ((res = IsValid (name, name)) != AdditionResult.Success)
 127                                 return res;
 128
 129                         DefineName (name, ievent);
 130
 131                         if (defined_events == null)
 132                                 defined_events = new ArrayList ();
 133
 134                         defined_events.Add (ievent);
 135                         return AdditionResult.Success;
 136                 }
 137
 138                 public bool AddIndexer (InterfaceIndexer iindexer)
 139                 {
 140                         if (defined_indexer == null)
 141                                 defined_indexer = new ArrayList ();
 142
 143                         defined_indexer.Add (iindexer);
 144                         return true;
 145                 }
 146
 147                 public ArrayList InterfaceMethods {
 148                         get {
 149                                 return defined_method;
 150                         }
 151                 }
 152
 153                 public ArrayList InterfaceProperties {
 154                         get {
 155                                 return defined_properties;
 156                         }
 157                 }
 158
 159                 public ArrayList InterfaceEvents {
 160                         get {
 161                                 return defined_events;
 162                         }
 163                 }
 164
 165                 public ArrayList InterfaceIndexers {
 166                         get {
 167                                 return defined_indexer;
 168                         }
 169                 }
 170
 171                 public ArrayList Bases {
 172                         get {
 173                                 return bases;
 174                         }
 175
 176                         set {
 177                                 bases = value;
 178                         }
 179                 }
 180
 181                 public virtual TypeAttributes InterfaceAttr {
 182                         get {
 183                                 TypeAttributes x = TypeAttributes.Interface | TypeAttributes.Abstract;
 184
 185                                 if (IsTopLevel == false) {
 186
 187                                         if ((ModFlags & Modifiers.PROTECTED) != 0
 188                                             && (ModFlags & Modifiers.INTERNAL) != 0)
 189                                                 x |= TypeAttributes.NestedFamORAssem;
 190                                         else if ((ModFlags & Modifiers.PROTECTED) != 0)
 191                                                 x |= TypeAttributes.NestedFamily;
 192                                         else if ((ModFlags & Modifiers.INTERNAL) != 0)
 193                                                 x |= TypeAttributes.NestedAssembly;
 194                                         else if ((ModFlags & Modifiers.PUBLIC) != 0)
 195                                                 x |= TypeAttributes.NestedPublic;
 196                                         else
 197                                                 x |= TypeAttributes.NestedPrivate;
 198                                 } else {
 199                                         if ((ModFlags & Modifiers.PUBLIC) != 0)
 200                                                 x |= TypeAttributes.Public;
 201                                         else if ((ModFlags & Modifiers.PRIVATE) != 0)
 202                                                 x |= TypeAttributes.NotPublic;
 203                                 }
 204
 205                                 if ((ModFlags & Modifiers.ABSTRACT) != 0)
 206                                         x |= TypeAttributes.Abstract;
 207
 208                                 if ((ModFlags & Modifiers.SEALED) != 0)
 209                                         x |= TypeAttributes.Sealed;
 210
 211                                 return x;
 212                         }
 213                 }
 214
 215                 void Error111 (InterfaceMemberBase ib)
 216                 {
 217                         Report.Error (
 218                                 111,
 219                                 "Interface `" + Name + "' already contains a definition with the " +
 220                                 "same return value and parameter types for member `" + ib.Name + "'");
 221                 }
 222
 223                 bool RegisterMethod (MethodBase mb, InternalParameters ip, Type [] types)
 224                 {
 225                         if (!TypeManager.RegisterMethod (mb, ip, types))
 226                                 return false;
 227
 228                         method_builders.Add (mb);
 229                         return true;
 230                 }
 231
 232                 //
 233                 // This might trigger a definition of the methods.  This happens only
 234                 // with Attributes, as Attribute classes are processed before interfaces.
 235                 // Ideally, we should make everything just define recursively in terms
 236                 // of its dependencies.
 237                 //
 238                 public MethodInfo [] GetMethods (TypeContainer container)
 239                 {
 240                         int n = 0;
 241
 242                         if (!members_defined){
 243                                 if (DefineMembers (container))
 244                                         n = method_builders.Count;
 245                         } else
 246                                 n = method_builders.Count;
 247
 248                         MethodInfo [] mi = new MethodInfo [n];
 249
 250                         method_builders.CopyTo (mi, 0);
 251
 252                         return mi;
 253                 }
 254
 255                 // Hack around System.Reflection as found everywhere else
 256                 public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,
 257                                                         MemberFilter filter, object criteria)
 258                 {
 259                         ArrayList members = new ArrayList ();
 260
 261                         if ((mt & MemberTypes.Method) != 0) {
 262                                 foreach (MethodBuilder mb in method_builders)
 263                                         if (filter (mb, criteria))
 264                                                 members.Add (mb);
 265                         }
 266
 267                         if ((mt & MemberTypes.Property) != 0) {
 268                                 foreach (PropertyBuilder pb in property_builders)
 269                                         if (filter (pb, criteria))
 270                                                 members.Add (pb);
 271                         }
 272
 273                         if ((mt & MemberTypes.Event) != 0) {
 274                                 foreach (MyEventBuilder eb in event_builders)
 275                                         if (filter (eb, criteria))
 276                                                 members.Add (eb);
 277                         }
 278
 279                         if (((bf & BindingFlags.DeclaredOnly) == 0) && (TypeBuilder.BaseType != null)) {
 280                                 MemberList parent_mi;
 281
 282                                 parent_mi = TypeContainer.FindMembers (
 283                                         TypeBuilder.BaseType, mt, bf, filter, criteria);
 284
 285                                 members.AddRange (parent_mi);
 286                         }
 287
 288                         return new MemberList (members);
 289                 }
 290
 291                 public override MemberCache MemberCache {
 292                         get {
 293                                 return member_cache;
 294                         }
 295                 }
 296
 297                 //
 298                 // Populates the methods in the interface
 299                 //
 300                 void PopulateMethod (TypeContainer parent, DeclSpace decl_space, InterfaceMethod im)
 301                 {
 302                         Type return_type = im.ReturnType.Type;
 303                         if (return_type == null)
 304                                 return_type = this.ResolveType (im.ReturnType, false, im.Location);
 305
 306                         Type [] arg_types = im.ParameterTypes (this);
 307                         MethodBuilder mb;
 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                         // Labelling of parameters is taken care of
 343                         // during the Emit phase via
 344                         // MethodCore.LabelParameters method so I am
 345                         // removing the old code here.
 346                         //
 347
 348                         im.Builder = mb;
 349
 350                 }
 351
 352                 //
 353                 // Populates the properties in the interface
 354                 //
 355                 void PopulateProperty (TypeContainer parent, DeclSpace decl_space, InterfaceProperty ip)
 356                 {
 357                         PropertyBuilder pb;
 358                         MethodBuilder get = null, set = null;
 359                         ip.Type = this.ResolveTypeExpr (ip.Type, false, ip.Location);
 360                         if (ip.Type == null)
 361                                 return;
 362
 363                         Type prop_type = ip.Type.Type;
 364                         Type [] setter_args = new Type [1];
 365
 366                         if (prop_type == null)
 367                                 return;
 368
 369                         if (prop_type.IsPointer && !UnsafeOK (this))
 370                                 return;
 371
 372                         setter_args [0] = prop_type;
 373
 374                         //
 375                         // FIXME: properties are missing the following
 376                         // flags: hidebysig newslot specialname
 377                         //
 378                         pb = TypeBuilder.DefineProperty (
 379                                 ip.Name, PropertyAttributes.None,
 380                                 prop_type, null);
 381
 382                         if (ip.HasGet){
 383                                 get = TypeBuilder.DefineMethod (
 384                                         "get_" + ip.Name, property_attributes ,
 385                                         prop_type, null);
 386
 387                                 //
 388                                 // HACK because System.Reflection.Emit is lame
 389                                 //
 390                                 Type [] null_types = null;
 391                                 InternalParameters inp = new InternalParameters
 392                                         (null_types, Parameters.EmptyReadOnlyParameters);
 393
 394                                 if (!RegisterMethod (get, inp, null)) {
 395                                         Error111 (ip);
 396                                         return;
 397                                 }
 398
 399                                 pb.SetGetMethod (get);
 400                         }
 401
 402                         if (ip.HasSet){
 403                                 setter_args [0] = prop_type;
 404
 405                                 set = TypeBuilder.DefineMethod (
 406                                         "set_" + ip.Name, property_attributes,
 407                                         TypeManager.void_type, setter_args);
 408
 409                                 set.DefineParameter (1, ParameterAttributes.None, "value");
 410                                 pb.SetSetMethod (set);
 411
 412                                 //
 413                                 // HACK because System.Reflection.Emit is lame
 414                                 //
 415                                 Parameter [] parms = new Parameter [1];
 416                                 parms [0] = new Parameter (ip.Type, "value", Parameter.Modifier.NONE, null);
 417                                 InternalParameters ipp = new InternalParameters (
 418                                         this, new Parameters (parms, null, Location.Null));
 419
 420                                 if (!RegisterMethod (set, ipp, setter_args)) {
 421                                         Error111 (ip);
 422                                         return;
 423                                 }
 424                         }
 425
 426                         TypeManager.RegisterProperty (pb, get, set);
 427                         property_builders.Add (pb);
 428                         ip.Builder = pb;
 429                 }
 430
 431                 //
 432                 // Populates the events in the interface
 433                 //
 434                 void PopulateEvent (TypeContainer parent, DeclSpace decl_space, InterfaceEvent ie)
 435                 {
 436                         //
 437                         // FIXME: We need to do this after delegates have been
 438                         // declared or we declare them recursively.
 439                         //
 440                         MyEventBuilder eb;
 441                         MethodBuilder add = null, remove = null;
 442                         ie.Type = this.ResolveTypeExpr (ie.Type, false, ie.Location);
 443                         if (ie.Type == null)
 444                                 return;
 445
 446                         Type event_type = ie.Type.Type;
 447
 448                         if (event_type == null)
 449                                 return;
 450
 451                         if (event_type.IsPointer && !UnsafeOK (this))
 452                                 return;
 453
 454                         Type [] parameters = new Type [1];
 455                         parameters [0] = event_type;
 456
 457                         eb = new MyEventBuilder (null, TypeBuilder, ie.Name,
 458                                                  EventAttributes.None, event_type);
 459
 460                         //
 461                         // Now define the accessors
 462                         //
 463                         string add_name = "add_" + ie.Name;
 464
 465                         add = TypeBuilder.DefineMethod (
 466                                 add_name, property_attributes, null, parameters);
 467                         add.DefineParameter (1, ParameterAttributes.None, "value");
 468                         eb.SetAddOnMethod (add);
 469
 470                         string remove_name = "remove_" + ie.Name;
 471                         remove = TypeBuilder.DefineMethod (
 472                                 remove_name, property_attributes, null, parameters);
 473                         remove.DefineParameter (1, ParameterAttributes.None, "value");
 474                         eb.SetRemoveOnMethod (remove);
 475
 476                         Parameter [] parms = new Parameter [1];
 477                         parms [0] = new Parameter (ie.Type, "value", Parameter.Modifier.NONE, null);
 478                         InternalParameters ip = new InternalParameters (
 479                                 this, new Parameters (parms, null, Location.Null));
 480
 481                         if (!RegisterMethod (add, ip, parameters)) {
 482                                 Error111 (ie);
 483                                 return;
 484                         }
 485
 486                         if (!RegisterMethod (remove, ip, parameters)) {
 487                                 Error111 (ie);
 488                                 return;
 489                         }
 490
 491                         TypeManager.RegisterEvent (eb, add, remove);
 492                         event_builders.Add (eb);
 493
 494                         ie.Builder = eb;
 495                 }
 496
 497                 //
 498                 // Populates the indexers in the interface
 499                 //
 500                 void PopulateIndexer (TypeContainer parent, DeclSpace decl_space, InterfaceIndexer ii)
 501                 {
 502                         PropertyBuilder pb;
 503                         ii.Type = this.ResolveTypeExpr (ii.Type, false, ii.Location);
 504                         if (ii.Type == null)
 505                                 return;
 506
 507                         Type prop_type = ii.Type.Type;
 508                         Type [] arg_types = ii.ParameterTypes (this);
 509                         Type [] value_arg_types;
 510
 511                         if (prop_type == null)
 512                                 return;
 513
 514                         if (prop_type.IsPointer && !UnsafeOK (this))
 515                                 return;
 516
 517                         //
 518                         // Sets up the extra invisible `value' argument for setters.
 519                         //
 520                         if (arg_types != null){
 521                                 int count = arg_types.Length;
 522                                 value_arg_types = new Type [count + 1];
 523
 524                                 arg_types.CopyTo (value_arg_types, 0);
 525                                 value_arg_types [count] = prop_type;
 526
 527                                 foreach (Type t in arg_types){
 528                                         if (t.IsPointer && !UnsafeOK (this))
 529                                                 return;
 530                                 }
 531                         } else {
 532                                 value_arg_types = new Type [1];
 533
 534                                 value_arg_types [1] = prop_type;
 535                         }
 536
 537                         EmitContext ec = new EmitContext (parent, decl_space, Location, null,
 538                                                           null, ModFlags, false);
 539
 540                         IndexerName = Attribute.ScanForIndexerName (ec, ii.OptAttributes);
 541                         if (IndexerName == null)
 542                                 IndexerName = "Item";
 543
 544                         pb = TypeBuilder.DefineProperty (
 545                                 IndexerName, PropertyAttributes.None,
 546                                 prop_type, arg_types);
 547
 548                         MethodBuilder set_item = null, get_item = null;
 549                         if (ii.HasGet){
 550                                 Parameter [] p = ii.Parameters.FixedParameters;
 551
 552                                 get_item = TypeBuilder.DefineMethod (
 553                                         "get_" + IndexerName, property_attributes,
 554                                         prop_type, arg_types);
 555                                 pb.SetGetMethod (get_item);
 556                                 //
 557                                 // HACK because System.Reflection.Emit is lame
 558                                 //
 559                                 InternalParameters ip = new InternalParameters (
 560                                         arg_types, ii.Parameters);
 561
 562                                 if (!RegisterMethod (get_item, ip, arg_types)) {
 563                                         Error111 (ii);
 564                                         return;
 565                                 }
 566
 567                                 if (p != null){
 568                                         for (int i = 0; i < p.Length; i++)
 569                                                 get_item.DefineParameter (
 570                                                         i + 1,
 571                                                         p [i].Attributes, p [i].Name);
 572                                 }
 573                         }
 574
 575                         if (ii.HasSet){
 576                                 Parameter [] p = ii.Parameters.FixedParameters;
 577                                 Parameter [] pv;
 578                                 int i = 0;
 579
 580                                 pv = new Parameter [p.Length + 1];
 581                                 p.CopyTo (pv, 0);
 582                                 pv [p.Length] = new Parameter (ii.Type, "value", Parameter.Modifier.NONE, null);
 583                                 Parameters value_params = new Parameters (pv, null, Location.Null);
 584                                 value_params.GetParameterInfo (decl_space);
 585
 586                                 set_item = TypeBuilder.DefineMethod (
 587                                         "set_" + IndexerName, property_attributes,
 588                                         TypeManager.void_type, value_arg_types);
 589                                 pb.SetSetMethod (set_item);
 590                                 //
 591                                 // HACK because System.Reflection.Emit is lame
 592                                 //
 593                                 InternalParameters ip = new InternalParameters (
 594                                         value_arg_types, value_params);
 595                                 if (!RegisterMethod (set_item, ip, value_arg_types)) {
 596                                         Error111 (ii);
 597                                         return;
 598                                 }
 599
 600                                 if (p != null){
 601                                         for (; i < p.Length; i++)
 602                                                 set_item.DefineParameter (
 603                                                         i + 1,
 604                                                         p [i].Attributes, p [i].Name);
 605                                 }
 606
 607                                 set_item.DefineParameter (i + 1, ParameterAttributes.None, "value");
 608                         }
 609
 610                         property_builders.Add (pb);
 611
 612                         ii.Builder = pb;
 613                 }
 614
 615                 /// <summary>
 616                 ///   Performs the semantic analysis for all the interface members
 617                 ///   that were declared
 618                 /// </summary>
 619                 bool SemanticAnalysis ()
 620                 {
 621                         Hashtable methods = new Hashtable ();
 622
 623
 624                         if (defined_method != null){
 625                                 foreach (InterfaceMethod im in defined_method){
 626                                         string sig = im.GetSignature (this);
 627
 628                                         //
 629                                         // If there was an undefined Type on the signatures
 630                                         //
 631                                         if (sig == null)
 632                                                 continue;
 633
 634                                         if (methods [sig] != null){
 635                                                 Error111 (im);
 636                                                 return false;
 637                                         }
 638                                 }
 639                         }
 640
 641                         //
 642                         // FIXME: Here I should check i
 643                         //
 644                         return true;
 645                 }
 646
 647                 TypeExpr GetInterfaceTypeByName (Expression name)
 648                 {
 649                         TypeExpr resolved = ResolveTypeExpr (name, false, Location);
 650                         if (resolved == null)
 651                                 return null;
 652
 653                         if (resolved.IsInterface)
 654                                 return resolved;
 655
 656                         string cause;
 657
 658                         if (resolved.IsValueType)
 659                                 cause = "is a struct";
 660                         else if (resolved.IsClass)
 661                                 cause = "is a class";
 662                         else
 663                                 cause = "Should not happen.";
 664
 665                         Report.Error (527, Location, "`"+resolved.Name+"' " + cause +
 666                                       ", need an interface instead");
 667
 668                         return null;
 669                 }
 670
 671                 //
 672                 // Returns the list of interfaces that this interface implements
 673                 // Or null if it does not implement any interface.
 674                 //
 675                 // Sets the error boolean accoringly.
 676                 //
 677                 TypeExpr [] GetInterfaceBases (out bool error)
 678                 {
 679                         TypeExpr [] tbases;
 680                         int i;
 681
 682                         error = false;
 683                         if (Bases == null)
 684                                 return null;
 685
 686                         tbases = new TypeExpr [Bases.Count];
 687                         i = 0;
 688
 689                         foreach (Expression name in Bases){
 690                                 TypeExpr t;
 691
 692                                 t = GetInterfaceTypeByName (name);
 693                                 if (t == null){
 694                                         error = true;
 695                                         return null;
 696                                 }
 697
 698                                 if (!t.AsAccessible (Parent, ModFlags))
 699                                         Report.Error (61, Location,
 700                                                       "Inconsistent accessibility: base interface `" +
 701                                                       t.Name + "' is less accessible than interface `" +
 702                                                       Name + "'");
 703
 704                                 tbases [i++] = t;
 705                         }
 706
 707                         return TypeManager.ExpandInterfaces (tbases);
 708                 }
 709
 710                 //
 711                 // <summary>
 712                 //  Defines the Interface in the appropriate ModuleBuilder or TypeBuilder
 713                 // </summary>
 714                 //
 715                 // TODO:
 716                 //   Rework the way we recurse, because for recursive
 717                 //   definitions of interfaces (A:B and B:A) we report the
 718                 //   error twice, rather than once.
 719
 720                 public override TypeBuilder DefineType ()
 721                 {
 722                         TypeExpr [] ifaces;
 723                         bool error;
 724
 725                         if (TypeBuilder != null)
 726                                 return TypeBuilder;
 727
 728                         if (InTransit)
 729                                 return null;
 730
 731                         InTransit = true;
 732
 733                         EmitContext ec = new EmitContext (this, this, Location, null, null,
 734                                                           ModFlags, false);
 735
 736                         ifaces = GetInterfaceBases (out error);
 737
 738                         if (error)
 739                                 return null;
 740
 741                         if (IsGeneric) {
 742                                 foreach (TypeParameter type_param in TypeParameters)
 743                                         if (!type_param.Resolve (this)) {
 744                                                 error = true;
 745                                                 return null;
 746                                         }
 747                         }
 748
 749                         if (IsTopLevel) {
 750                                 if (TypeManager.NamespaceClash (Name, Location))
 751                                         return null;
 752
 753                                 ModuleBuilder builder = CodeGen.ModuleBuilder;
 754
 755                                 TypeBuilder = builder.DefineType (
 756                                         Name,
 757                                         InterfaceAttr,
 758                                         (Type)null,   // Parent Type
 759                                         null);
 760                                 RootContext.RegisterOrder (this);
 761                         } else {
 762                                 TypeBuilder builder = Parent.TypeBuilder;
 763
 764                                 TypeBuilder = builder.DefineNestedType (
 765                                         Basename,
 766                                         InterfaceAttr,
 767                                         (Type) null, //parent type
 768                                         null);
 769
 770                                 TypeContainer tc = TypeManager.LookupTypeContainer (builder);
 771                                 tc.RegisterOrder (this);
 772                         }
 773
 774                         if (IsGeneric) {
 775                                 foreach (TypeParameter type_param in TypeParameters)
 776                                         type_param.Define (TypeBuilder);
 777
 778                                 foreach (TypeParameter type_param in TypeParameters)
 779                                         type_param.DefineType (ec, TypeBuilder);
 780                         }
 781
 782                         if (ifaces != null) {
 783                                 foreach (TypeExpr iface in ifaces) {
 784                                         Type itype = iface.ResolveType (ec);
 785                                         TypeBuilder.AddInterfaceImplementation (itype);
 786                                 }
 787                         }
 788
 789                         TypeManager.AddUserInterface (Name, TypeBuilder, this, ifaces);
 790                         InTransit = false;
 791
 792                         return TypeBuilder;
 793                 }
 794
 795                 //
 796                 // Defines the indexers, and also verifies that the IndexerNameAttribute in the
 797                 // interface is consistent.  Either it is `Item' or it is the name defined by all the
 798                 // indexers with the `IndexerName' attribute.
 799                 //
 800                 // Turns out that the IndexerNameAttribute is applied to each indexer,
 801                 // but it is never emitted, instead a DefaultName attribute is attached
 802                 // to the interface
 803                 //
 804                 void DefineIndexers (TypeContainer parent)
 805                 {
 806                         string interface_indexer_name = null;
 807
 808                         foreach (InterfaceIndexer ii in defined_indexer){
 809
 810                                 PopulateIndexer (parent, this, ii);
 811
 812                                 if (interface_indexer_name == null){
 813                                         interface_indexer_name = IndexerName;
 814                                         continue;
 815                                 }
 816
 817                                 if (IndexerName == interface_indexer_name)
 818                                         continue;
 819
 820                                 Report.Error (
 821                                         668, "Two indexers have different names, " +
 822                                         " you should use the same name for all your indexers");
 823                         }
 824                         if (interface_indexer_name == null)
 825                                 interface_indexer_name = "Item";
 826                         IndexerName = interface_indexer_name;
 827                 }
 828
 829                 /// <summary>
 830                 ///   Performs semantic analysis, and then generates the IL interfaces
 831                 /// </summary>
 832                 public override bool DefineMembers (TypeContainer parent)
 833                 {
 834                         if (members_defined)
 835                                 return true;
 836
 837                         if (!SemanticAnalysis ())
 838                                 return false;
 839
 840
 841                         if (defined_method != null){
 842                                 foreach (InterfaceMethod im in defined_method)
 843                                         PopulateMethod (parent, this, im);
 844                         }
 845
 846                         if (defined_properties != null){
 847                                 foreach (InterfaceProperty ip in defined_properties)
 848                                         PopulateProperty (parent, this, ip);
 849                         }
 850
 851                         if (defined_events != null)
 852                                 foreach (InterfaceEvent ie in defined_events)
 853                                         PopulateEvent (parent, this, ie);
 854
 855                         if (defined_indexer != null) {
 856                                 DefineIndexers (parent);
 857
 858                                 CustomAttributeBuilder cb = EmitDefaultMemberAttr (
 859                                         parent, IndexerName, ModFlags, Location);
 860                                 if (cb != null)
 861                                         TypeBuilder.SetCustomAttribute (cb);
 862                         }
 863
 864 #if CACHE
 865                         if (TypeBuilder.BaseType != null)
 866                                 parent_container = TypeManager.LookupMemberContainer (TypeBuilder.BaseType);
 867
 868                         member_cache = new MemberCache (this);
 869 #endif
 870                         members_defined = true;
 871                         return true;
 872                 }
 873
 874
 875                 //
 876                 // In the case of Interfaces, there is nothing to do here
 877                 //
 878                 public override bool Define (TypeContainer parent)
 879                 {
 880                         return true;
 881                 }
 882
 883                 /// <summary>
 884                 ///   Applies all the attributes.
 885                 /// </summary>
 886                 public void Emit (TypeContainer tc)
 887                 {
 888                         if (OptAttributes != null) {
 889                                 EmitContext ec = new EmitContext (tc, this, Location, null, null,
 890                                                                   ModFlags, false);
 891                                 Attribute.ApplyAttributes (ec, TypeBuilder, this, OptAttributes);
 892                         }
 893
 894                         // Now emit attributes for each interface member
 895                         if (defined_method != null) {
 896                                 foreach (InterfaceMethod im in defined_method) {
 897                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 898                                                                           im.ReturnType.Type, ModFlags, false);
 899
 900                                         MethodCore.LabelParameters (ec, im.Builder,
 901                                                                     im.Parameters,
 902                                                                     im.OptAttributes,
 903                                                                     Location);
 904
 905                                         if (im.OptAttributes != null)
 906                                                 Attribute.ApplyAttributes (ec, im.Builder,
 907                                                                            im, im.OptAttributes);
 908
 909                                 }
 910                         }
 911
 912                         if (defined_properties != null) {
 913                                 foreach (InterfaceProperty ip in defined_properties) {
 914                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 915                                                                           null, ModFlags, false);
 916
 917                                         if (ip.OptAttributes != null)
 918                                                 Attribute.ApplyAttributes (ec, ip.Builder, ip, ip.OptAttributes);
 919                                 }
 920                         }
 921
 922                         if (defined_events != null) {
 923                                 foreach (InterfaceEvent ie in defined_events) {
 924                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 925                                                                           null, ModFlags, false);
 926
 927                                         if (ie.OptAttributes != null)
 928                                                 Attribute.ApplyAttributes (ec, ie.Builder, ie, ie.OptAttributes);
 929                                 }
 930                         }
 931                 }
 932
 933                 public static CustomAttributeBuilder EmitDefaultMemberAttr (TypeContainer parent,
 934                                                                             string name,
 935                                                                             int flags,
 936                                                                             Location loc)
 937                 {
 938                         EmitContext ec = new EmitContext (parent, loc, null, null, flags);
 939
 940                         Expression ml = Expression.MemberLookup (ec, TypeManager.default_member_type,
 941                                                                  ".ctor", MemberTypes.Constructor,
 942                                                                  BindingFlags.Public | BindingFlags.Instance,
 943                                                                  Location.Null);
 944
 945                         if (!(ml is MethodGroupExpr)) {
 946                                 Console.WriteLine ("Internal error !!!!");
 947                                 return null;
 948                         }
 949
 950                         MethodGroupExpr mg = (MethodGroupExpr) ml;
 951
 952                         MethodBase constructor = mg.Methods [0];
 953
 954                         string [] vals = { name };
 955
 956                         CustomAttributeBuilder cb = null;
 957                         try {
 958                                 cb = new CustomAttributeBuilder ((ConstructorInfo) constructor, vals);
 959                         } catch {
 960                                 Report.Warning (-100, "Can not set the indexer default member attribute");
 961                         }
 962
 963                         return cb;
 964                 }
 965
 966                 //
 967                 // IMemberContainer
 968                 //
 969
 970                 string IMemberContainer.Name {
 971                         get {
 972                                 return Name;
 973                         }
 974                 }
 975
 976                 Type IMemberContainer.Type {
 977                         get {
 978                                 return TypeBuilder;
 979                         }
 980                 }
 981
 982                 IMemberContainer IMemberContainer.Parent {
 983                         get {
 984                                 return parent_container;
 985                         }
 986                 }
 987
 988                 MemberCache IMemberContainer.MemberCache {
 989                         get {
 990                                 return member_cache;
 991                         }
 992                 }
 993
 994                 bool IMemberContainer.IsInterface {
 995                         get {
 996                                 return true;
 997                         }
 998                 }
 999
1000                 MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
1001                 {
1002                         // Interfaces only contain instance members.
1003                         if ((bf & BindingFlags.Instance) == 0)
1004                                 return MemberList.Empty;
1005                         if ((bf & BindingFlags.Public) == 0)
1006                                 return MemberList.Empty;
1007
1008                         ArrayList members = new ArrayList ();
1009
1010                         if ((mt & MemberTypes.Method) != 0)
1011                                 members.AddRange (method_builders);
1012
1013                         if ((mt & MemberTypes.Property) != 0)
1014                                 members.AddRange (property_builders);
1015
1016                         if ((mt & MemberTypes.Event) != 0)
1017                                 members.AddRange (event_builders);
1018
1019                         return new MemberList (members);
1020                 }
1021         }
1022
1023         public class InterfaceMemberBase {
1024                 public readonly string Name;
1025                 public readonly bool IsNew;
1026                 public Attributes OptAttributes;
1027
1028                 public InterfaceMemberBase (string name, bool is_new, Attributes attrs)
1029                 {
1030                         Name = name;
1031                         IsNew = is_new;
1032                         OptAttributes = attrs;
1033                 }
1034         }
1035
1036         public class InterfaceProperty : InterfaceMemberBase {
1037                 public readonly bool HasSet;
1038                 public readonly bool HasGet;
1039                 public readonly Location Location;
1040                 public Expression Type;
1041                 public PropertyBuilder Builder;
1042
1043                 public InterfaceProperty (Expression type, string name,
1044                                           bool is_new, bool has_get, bool has_set,
1045                                           Attributes attrs, Location loc)
1046                         : base (name, is_new, attrs)
1047                 {
1048                         Type = type;
1049                         HasGet = has_get;
1050                         HasSet = has_set;
1051                         Location = loc;
1052                 }
1053         }
1054
1055         public class InterfaceEvent : InterfaceMemberBase {
1056                 public readonly Location Location;
1057                 public Expression Type;
1058                 public MyEventBuilder Builder;
1059
1060                 public InterfaceEvent (Expression type, string name, bool is_new, Attributes attrs,
1061                                        Location loc)
1062                         : base (name, is_new, attrs)
1063                 {
1064                         Type = type;
1065                         Location = loc;
1066                 }
1067         }
1068
1069         public class InterfaceMethod : InterfaceMemberBase {
1070                 public Expression ReturnType;
1071                 public readonly Parameters Parameters;
1072                 public readonly Location Location;
1073                 public MethodBuilder Builder;
1074
1075                 public InterfaceMethod (Expression return_type, string name, bool is_new, Parameters args,
1076                                         Attributes attrs, Location l)
1077                         : base (name, is_new, attrs)
1078                 {
1079                         this.ReturnType = return_type;
1080                         this.Parameters = args;
1081                         Location = l;
1082                 }
1083
1084                 /// <summary>
1085                 ///   Returns the signature for this interface method
1086                 /// </summary>
1087                 public string GetSignature (DeclSpace ds)
1088                 {
1089                         ReturnType = ds.ResolveTypeExpr (ReturnType, false, Location);
1090                         if (ReturnType == null)
1091                                 return null;
1092
1093                         Type ret = ReturnType.Type;
1094                         string args = Parameters.GetSignature (ds);
1095
1096                         if ((ret == null) || (args == null))
1097                                 return null;
1098
1099                         return (IsNew ? "new-" : "") + ret.FullName + "(" + args + ")";
1100                 }
1101
1102                 public Type [] ParameterTypes (DeclSpace ds)
1103                 {
1104                         return Parameters.GetParameterInfo (ds);
1105                 }
1106         }
1107
1108         public class InterfaceIndexer : InterfaceMemberBase {
1109                 public readonly bool HasGet, HasSet;
1110                 public readonly Parameters Parameters;
1111                 public readonly Location Location;
1112                 public Expression Type;
1113                 public PropertyBuilder Builder;
1114
1115                 public InterfaceIndexer (Expression type, Parameters args, bool do_get, bool do_set,
1116                                          bool is_new, Attributes attrs, Location loc)
1117                         : base ("", is_new, attrs)
1118                 {
1119                         Type = type;
1120                         Parameters = args;
1121                         HasGet = do_get;
1122                         HasSet = do_set;
1123                         Location = loc;
1124                 }
1125
1126                 public Type [] ParameterTypes (DeclSpace ds)
1127                 {
1128                         return Parameters.GetParameterInfo (ds);
1129                 }
1130         }
1131 }