mcs/mcs/interface.cs

   1 //
   2 // interface.cs: Interface handler
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //
   6 // Licensed under the terms of the GNU GPL
   7 //
   8 // (C) 2001 Ximian, Inc (http://www.ximian.com)
   9 //
  10 #define CACHE
  11 using System.Collections;
  12 using System;
  13 using System.IO;
  14 using System.Reflection;
  15 using System.Reflection.Emit;
  16
  17 namespace Mono.CSharp {
  18
  19         /// <summary>
  20         ///   Interfaces
  21         /// </summary>
  22         public class Interface : DeclSpace, IMemberContainer {
  23                 const MethodAttributes interface_method_attributes =
  24                         MethodAttributes.Public |
  25                         MethodAttributes.Abstract |
  26                         MethodAttributes.HideBySig |
  27                         MethodAttributes.NewSlot |
  28                         MethodAttributes.Virtual;
  29
  30                 const MethodAttributes property_attributes =
  31                         MethodAttributes.Public |
  32                         MethodAttributes.Abstract |
  33                         MethodAttributes.HideBySig |
  34                         MethodAttributes.NewSlot |
  35                         MethodAttributes.SpecialName |
  36                         MethodAttributes.Virtual;
  37
  38                 ArrayList bases;
  39
  40                 ArrayList defined_method;
  41                 ArrayList defined_indexer;
  42                 ArrayList defined_events;
  43                 ArrayList defined_properties;
  44
  45                 ArrayList method_builders;
  46                 ArrayList property_builders;
  47                 ArrayList event_builders;
  48
  49                 Attributes OptAttributes;
  50
  51                 public string IndexerName;
  52
  53                 IMemberContainer parent_container;
  54                 MemberCache member_cache;
  55
  56                 bool members_defined;
  57
  58                 // These will happen after the semantic analysis
  59
  60                 // Hashtable defined_indexers;
  61                 // Hashtable defined_methods;
  62
  63                 /// <summary>
  64                 ///   Modifiers allowed in a class declaration
  65                 /// </summary>
  66                 public const int AllowedModifiers =
  67                         Modifiers.NEW       |
  68                         Modifiers.PUBLIC    |
  69                         Modifiers.PROTECTED |
  70                         Modifiers.INTERNAL  |
  71                         Modifiers.UNSAFE    |
  72                         Modifiers.PRIVATE;
  73
  74                 public Interface (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
 311                         if (return_type == null)
 312                                 return;
 313
 314                         if (return_type.IsPointer && !UnsafeOK (this))
 315                                 return;
 316
 317                         if (arg_types == null)
 318                                 return;
 319
 320                         foreach (Type t in arg_types){
 321
 322                                 if (t == null)
 323                                         return;
 324
 325                                 if (t.IsPointer && !UnsafeOK (this))
 326                                         return;
 327                         }
 328
 329                         //
 330                         // Create the method
 331                         //
 332                         mb = TypeBuilder.DefineMethod (
 333                                 im.Name, interface_method_attributes,
 334                                 return_type, arg_types);
 335
 336                         InternalParameters ip = new InternalParameters (arg_types, im.Parameters);
 337
 338                         if (!RegisterMethod (mb, ip, arg_types)) {
 339                                 Error111 (im);
 340                                 return;
 341                         }
 342
 343                         //
 344                         // Labelling of parameters is taken care of
 345                         // during the Emit phase via
 346                         // MethodCore.LabelParameters method so I am
 347                         // removing the old code here.
 348                         //
 349
 350                         im.Builder = mb;
 351
 352                 }
 353
 354                 //
 355                 // Populates the properties in the interface
 356                 //
 357                 void PopulateProperty (TypeContainer parent, DeclSpace decl_space, InterfaceProperty ip)
 358                 {
 359                         PropertyBuilder pb;
 360                         MethodBuilder get = null, set = null;
 361                         ip.Type = this.ResolveTypeExpr (ip.Type, false, ip.Location);
 362                         if (ip.Type == null)
 363                                 return;
 364
 365                         Type prop_type = ip.Type.Type;
 366                         Type [] setter_args = new Type [1];
 367
 368                         if (prop_type == null)
 369                                 return;
 370
 371                         if (prop_type.IsPointer && !UnsafeOK (this))
 372                                 return;
 373
 374                         setter_args [0] = prop_type;
 375
 376                         //
 377                         // FIXME: properties are missing the following
 378                         // flags: hidebysig newslot specialname
 379                         //
 380                         pb = TypeBuilder.DefineProperty (
 381                                 ip.Name, PropertyAttributes.None,
 382                                 prop_type, null);
 383
 384                         if (ip.HasGet){
 385                                 get = TypeBuilder.DefineMethod (
 386                                         "get_" + ip.Name, property_attributes ,
 387                                         prop_type, null);
 388
 389                                 //
 390                                 // HACK because System.Reflection.Emit is lame
 391                                 //
 392                                 Type [] null_types = null;
 393                                 InternalParameters inp = new InternalParameters
 394                                         (null_types, Parameters.EmptyReadOnlyParameters);
 395
 396                                 if (!RegisterMethod (get, inp, null)) {
 397                                         Error111 (ip);
 398                                         return;
 399                                 }
 400
 401                                 pb.SetGetMethod (get);
 402                         }
 403
 404                         if (ip.HasSet){
 405                                 setter_args [0] = prop_type;
 406
 407                                 set = TypeBuilder.DefineMethod (
 408                                         "set_" + ip.Name, property_attributes,
 409                                         TypeManager.void_type, setter_args);
 410
 411                                 set.DefineParameter (1, ParameterAttributes.None, "value");
 412                                 pb.SetSetMethod (set);
 413
 414                                 //
 415                                 // HACK because System.Reflection.Emit is lame
 416                                 //
 417                                 Parameter [] parms = new Parameter [1];
 418                                 parms [0] = new Parameter (ip.Type, "value", Parameter.Modifier.NONE, null);
 419                                 InternalParameters ipp = new InternalParameters (
 420                                         this, new Parameters (parms, null, Location.Null));
 421
 422                                 if (!RegisterMethod (set, ipp, setter_args)) {
 423                                         Error111 (ip);
 424                                         return;
 425                                 }
 426                         }
 427
 428                         TypeManager.RegisterProperty (pb, get, set);
 429                         property_builders.Add (pb);
 430                         ip.Builder = pb;
 431                 }
 432
 433                 //
 434                 // Populates the events in the interface
 435                 //
 436                 void PopulateEvent (TypeContainer parent, DeclSpace decl_space, InterfaceEvent ie)
 437                 {
 438                         //
 439                         // FIXME: We need to do this after delegates have been
 440                         // declared or we declare them recursively.
 441                         //
 442                         MyEventBuilder eb;
 443                         MethodBuilder add = null, remove = null;
 444                         ie.Type = this.ResolveTypeExpr (ie.Type, false, ie.Location);
 445                         if (ie.Type == null)
 446                                 return;
 447
 448                         Type event_type = ie.Type.Type;
 449
 450                         if (event_type == null)
 451                                 return;
 452
 453                         if (event_type.IsPointer && !UnsafeOK (this))
 454                                 return;
 455
 456                         Type [] parameters = new Type [1];
 457                         parameters [0] = event_type;
 458
 459                         eb = new MyEventBuilder (null, TypeBuilder, ie.Name,
 460                                                  EventAttributes.None, event_type);
 461
 462                         //
 463                         // Now define the accessors
 464                         //
 465                         string add_name = "add_" + ie.Name;
 466
 467                         add = TypeBuilder.DefineMethod (
 468                                 add_name, property_attributes, null, parameters);
 469                         add.DefineParameter (1, ParameterAttributes.None, "value");
 470                         eb.SetAddOnMethod (add);
 471
 472                         string remove_name = "remove_" + ie.Name;
 473                         remove = TypeBuilder.DefineMethod (
 474                                 remove_name, property_attributes, null, parameters);
 475                         remove.DefineParameter (1, ParameterAttributes.None, "value");
 476                         eb.SetRemoveOnMethod (remove);
 477
 478                         Parameter [] parms = new Parameter [1];
 479                         parms [0] = new Parameter (ie.Type, "value", Parameter.Modifier.NONE, null);
 480                         InternalParameters ip = new InternalParameters (
 481                                 this, new Parameters (parms, null, Location.Null));
 482
 483                         if (!RegisterMethod (add, ip, parameters)) {
 484                                 Error111 (ie);
 485                                 return;
 486                         }
 487
 488                         if (!RegisterMethod (remove, ip, parameters)) {
 489                                 Error111 (ie);
 490                                 return;
 491                         }
 492
 493                         TypeManager.RegisterEvent (eb, add, remove);
 494                         event_builders.Add (eb);
 495
 496                         ie.Builder = eb;
 497                 }
 498
 499                 //
 500                 // Populates the indexers in the interface
 501                 //
 502                 void PopulateIndexer (TypeContainer parent, DeclSpace decl_space, InterfaceIndexer ii)
 503                 {
 504                         PropertyBuilder pb;
 505                         ii.Type = this.ResolveTypeExpr (ii.Type, false, ii.Location);
 506                         if (ii.Type == null)
 507                                 return;
 508
 509                         Type prop_type = ii.Type.Type;
 510                         Type [] arg_types = ii.ParameterTypes (this);
 511                         Type [] value_arg_types;
 512
 513                         if (prop_type == null)
 514                                 return;
 515
 516                         if (prop_type.IsPointer && !UnsafeOK (this))
 517                                 return;
 518
 519                         //
 520                         // Sets up the extra invisible `value' argument for setters.
 521                         //
 522                         if (arg_types != null){
 523                                 int count = arg_types.Length;
 524                                 value_arg_types = new Type [count + 1];
 525
 526                                 arg_types.CopyTo (value_arg_types, 0);
 527                                 value_arg_types [count] = prop_type;
 528
 529                                 foreach (Type t in arg_types){
 530                                         if (t.IsPointer && !UnsafeOK (this))
 531                                                 return;
 532                                 }
 533                         } else {
 534                                 value_arg_types = new Type [1];
 535
 536                                 value_arg_types [1] = prop_type;
 537                         }
 538
 539                         EmitContext ec = new EmitContext (parent, decl_space, Location, null,
 540                                                           null, ModFlags, false);
 541
 542                         IndexerName = Attribute.ScanForIndexerName (ec, ii.OptAttributes);
 543                         if (IndexerName == null)
 544                                 IndexerName = "Item";
 545
 546                         pb = TypeBuilder.DefineProperty (
 547                                 IndexerName, PropertyAttributes.None,
 548                                 prop_type, arg_types);
 549
 550                         MethodBuilder set_item = null, get_item = null;
 551                         if (ii.HasGet){
 552                                 Parameter [] p = ii.Parameters.FixedParameters;
 553
 554                                 get_item = TypeBuilder.DefineMethod (
 555                                         "get_" + IndexerName, property_attributes,
 556                                         prop_type, arg_types);
 557                                 pb.SetGetMethod (get_item);
 558                                 //
 559                                 // HACK because System.Reflection.Emit is lame
 560                                 //
 561                                 InternalParameters ip = new InternalParameters (
 562                                         arg_types, ii.Parameters);
 563
 564                                 if (!RegisterMethod (get_item, ip, arg_types)) {
 565                                         Error111 (ii);
 566                                         return;
 567                                 }
 568
 569                                 if (p != null){
 570                                         for (int i = 0; i < p.Length; i++)
 571                                                 get_item.DefineParameter (
 572                                                         i + 1,
 573                                                         p [i].Attributes, p [i].Name);
 574                                 }
 575                         }
 576
 577                         if (ii.HasSet){
 578                                 Parameter [] p = ii.Parameters.FixedParameters;
 579                                 Parameter [] pv;
 580                                 int i = 0;
 581
 582                                 pv = new Parameter [p.Length + 1];
 583                                 p.CopyTo (pv, 0);
 584                                 pv [p.Length] = new Parameter (ii.Type, "value", Parameter.Modifier.NONE, null);
 585                                 Parameters value_params = new Parameters (pv, null, Location.Null);
 586                                 value_params.GetParameterInfo (decl_space);
 587
 588                                 set_item = TypeBuilder.DefineMethod (
 589                                         "set_" + IndexerName, property_attributes,
 590                                         TypeManager.void_type, value_arg_types);
 591                                 pb.SetSetMethod (set_item);
 592                                 //
 593                                 // HACK because System.Reflection.Emit is lame
 594                                 //
 595                                 InternalParameters ip = new InternalParameters (
 596                                         value_arg_types, value_params);
 597                                 if (!RegisterMethod (set_item, ip, value_arg_types)) {
 598                                         Error111 (ii);
 599                                         return;
 600                                 }
 601
 602                                 if (p != null){
 603                                         for (; i < p.Length; i++)
 604                                                 set_item.DefineParameter (
 605                                                         i + 1,
 606                                                         p [i].Attributes, p [i].Name);
 607                                 }
 608
 609                                 set_item.DefineParameter (i + 1, ParameterAttributes.None, "value");
 610                         }
 611
 612                         property_builders.Add (pb);
 613
 614                         ii.Builder = pb;
 615                 }
 616
 617                 /// <summary>
 618                 ///   Performs the semantic analysis for all the interface members
 619                 ///   that were declared
 620                 /// </summary>
 621                 bool SemanticAnalysis ()
 622                 {
 623                         Hashtable methods = new Hashtable ();
 624
 625
 626                         if (defined_method != null){
 627                                 foreach (InterfaceMethod im in defined_method){
 628                                         string sig = im.GetSignature (this);
 629
 630                                         //
 631                                         // If there was an undefined Type on the signatures
 632                                         //
 633                                         if (sig == null)
 634                                                 continue;
 635
 636                                         if (methods [sig] != null){
 637                                                 Error111 (im);
 638                                                 return false;
 639                                         }
 640                                 }
 641                         }
 642
 643                         //
 644                         // FIXME: Here I should check i
 645                         //
 646                         return true;
 647                 }
 648
 649                 TypeExpr GetInterfaceTypeByName (string name)
 650                 {
 651                         Type t = FindType (Location, name);
 652
 653                         if (t == null) {
 654                                 Report.Error (246, Location, "The type or namespace `" + name +
 655                                               "' could not be found");
 656                                 return null;
 657                         }
 658
 659                         if (t.IsInterface)
 660                                 return new TypeExpression (t, Location);
 661
 662                         string cause;
 663
 664                         if (t.IsValueType)
 665                                 cause = "is a struct";
 666                         else if (t.IsClass)
 667                                 cause = "is a class";
 668                         else
 669                                 cause = "Should not happen.";
 670
 671                         Report.Error (527, Location, "`"+name+"' " + cause +
 672                                       ", need an interface instead");
 673
 674                         return null;
 675                 }
 676
 677                 //
 678                 // Returns the list of interfaces that this interface implements
 679                 // Or null if it does not implement any interface.
 680                 //
 681                 // Sets the error boolean accoringly.
 682                 //
 683                 TypeExpr [] GetInterfaceBases (out bool error)
 684                 {
 685                         TypeExpr [] tbases;
 686                         int i;
 687
 688                         error = false;
 689                         if (Bases == null)
 690                                 return null;
 691
 692                         tbases = new TypeExpr [Bases.Count];
 693                         i = 0;
 694
 695                         foreach (string name in Bases){
 696                                 TypeExpr t;
 697
 698                                 t = GetInterfaceTypeByName (name);
 699                                 if (t == null){
 700                                         error = true;
 701                                         return null;
 702                                 }
 703
 704                                 if (!t.AsAccessible (Parent, ModFlags))
 705                                         Report.Error (61, Location,
 706                                                       "Inconsistent accessibility: base interface `" +
 707                                                       t.Name + "' is less accessible than interface `" +
 708                                                       Name + "'");
 709
 710                                 tbases [i++] = t;
 711                         }
 712
 713                         return TypeManager.ExpandInterfaces (tbases);
 714                 }
 715
 716                 //
 717                 // <summary>
 718                 //  Defines the Interface in the appropriate ModuleBuilder or TypeBuilder
 719                 // </summary>
 720                 //
 721                 // TODO:
 722                 //   Rework the way we recurse, because for recursive
 723                 //   definitions of interfaces (A:B and B:A) we report the
 724                 //   error twice, rather than once.
 725
 726                 public override TypeBuilder DefineType ()
 727                 {
 728                         TypeExpr [] ifaces;
 729                         bool error;
 730
 731                         if (TypeBuilder != null)
 732                                 return TypeBuilder;
 733
 734                         if (InTransit)
 735                                 return null;
 736
 737                         InTransit = true;
 738
 739                         EmitContext ec = new EmitContext (this, this, Location, null, null,
 740                                                           ModFlags, false);
 741
 742                         ifaces = GetInterfaceBases (out error);
 743
 744                         if (error)
 745                                 return null;
 746
 747                         if (IsTopLevel) {
 748                                 if (TypeManager.NamespaceClash (Name, Location))
 749                                         return null;
 750
 751                                 ModuleBuilder builder = CodeGen.ModuleBuilder;
 752
 753                                 TypeBuilder = builder.DefineType (
 754                                         Name,
 755                                         InterfaceAttr,
 756                                         (Type)null,   // Parent Type
 757                                         null);
 758                                 RootContext.RegisterOrder (this);
 759                         } else {
 760                                 TypeBuilder builder = Parent.TypeBuilder;
 761
 762                                 TypeBuilder = builder.DefineNestedType (
 763                                         Basename,
 764                                         InterfaceAttr,
 765                                         (Type) null, //parent type
 766                                         null);
 767
 768                                 TypeContainer tc = TypeManager.LookupTypeContainer (builder);
 769                                 tc.RegisterOrder (this);
 770                         }
 771
 772                         if (ifaces != null) {
 773                                 foreach (TypeExpr iface in ifaces) {
 774                                         Type itype = iface.ResolveType (ec);
 775                                         TypeBuilder.AddInterfaceImplementation (itype);
 776                                 }
 777                         }
 778
 779                         TypeManager.AddUserInterface (Name, TypeBuilder, this, ifaces);
 780                         InTransit = false;
 781
 782                         return TypeBuilder;
 783                 }
 784
 785                 //
 786                 // Defines the indexers, and also verifies that the IndexerNameAttribute in the
 787                 // interface is consistent.  Either it is `Item' or it is the name defined by all the
 788                 // indexers with the `IndexerName' attribute.
 789                 //
 790                 // Turns out that the IndexerNameAttribute is applied to each indexer,
 791                 // but it is never emitted, instead a DefaultName attribute is attached
 792                 // to the interface
 793                 //
 794                 void DefineIndexers (TypeContainer parent)
 795                 {
 796                         string interface_indexer_name = null;
 797
 798                         foreach (InterfaceIndexer ii in defined_indexer){
 799
 800                                 PopulateIndexer (parent, this, ii);
 801
 802                                 if (interface_indexer_name == null){
 803                                         interface_indexer_name = IndexerName;
 804                                         continue;
 805                                 }
 806
 807                                 if (IndexerName == interface_indexer_name)
 808                                         continue;
 809
 810                                 Report.Error (
 811                                         668, "Two indexers have different names, " +
 812                                         " you should use the same name for all your indexers");
 813                         }
 814                         if (interface_indexer_name == null)
 815                                 interface_indexer_name = "Item";
 816                         IndexerName = interface_indexer_name;
 817                 }
 818
 819                 /// <summary>
 820                 ///   Performs semantic analysis, and then generates the IL interfaces
 821                 /// </summary>
 822                 public override bool DefineMembers (TypeContainer parent)
 823                 {
 824                         if (members_defined)
 825                                 return true;
 826
 827                         if (!SemanticAnalysis ())
 828                                 return false;
 829
 830
 831                         if (defined_method != null){
 832                                 foreach (InterfaceMethod im in defined_method)
 833                                         PopulateMethod (parent, this, im);
 834                         }
 835
 836                         if (defined_properties != null){
 837                                 foreach (InterfaceProperty ip in defined_properties)
 838                                         PopulateProperty (parent, this, ip);
 839                         }
 840
 841                         if (defined_events != null)
 842                                 foreach (InterfaceEvent ie in defined_events)
 843                                         PopulateEvent (parent, this, ie);
 844
 845                         if (defined_indexer != null) {
 846                                 DefineIndexers (parent);
 847
 848                                 CustomAttributeBuilder cb = EmitDefaultMemberAttr (
 849                                         parent, IndexerName, ModFlags, Location);
 850                                 if (cb != null)
 851                                         TypeBuilder.SetCustomAttribute (cb);
 852                         }
 853
 854 #if CACHE
 855                         if (TypeBuilder.BaseType != null)
 856                                 parent_container = TypeManager.LookupMemberContainer (TypeBuilder.BaseType);
 857
 858                         member_cache = new MemberCache (this);
 859 #endif
 860                         members_defined = true;
 861                         return true;
 862                 }
 863
 864
 865                 //
 866                 // In the case of Interfaces, there is nothing to do here
 867                 //
 868                 public override bool Define (TypeContainer parent)
 869                 {
 870                         return true;
 871                 }
 872
 873                 /// <summary>
 874                 ///   Applies all the attributes.
 875                 /// </summary>
 876                 public void Emit (TypeContainer tc)
 877                 {
 878                         if (OptAttributes != null) {
 879                                 EmitContext ec = new EmitContext (tc, this, Location, null, null,
 880                                                                   ModFlags, false);
 881                                 Attribute.ApplyAttributes (ec, TypeBuilder, this, OptAttributes);
 882                         }
 883
 884                         // Now emit attributes for each interface member
 885                         if (defined_method != null) {
 886                                 foreach (InterfaceMethod im in defined_method) {
 887                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 888                                                                           im.ReturnType.Type, ModFlags, false);
 889
 890                                         MethodCore.LabelParameters (ec, im.Builder,
 891                                                                     im.Parameters,
 892                                                                     im.OptAttributes,
 893                                                                     Location);
 894
 895                                         if (im.OptAttributes != null)
 896                                                 Attribute.ApplyAttributes (ec, im.Builder,
 897                                                                            im, im.OptAttributes);
 898
 899                                 }
 900                         }
 901
 902                         if (defined_properties != null) {
 903                                 foreach (InterfaceProperty ip in defined_properties) {
 904                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 905                                                                           null, ModFlags, false);
 906
 907                                         if (ip.OptAttributes != null)
 908                                                 Attribute.ApplyAttributes (ec, ip.Builder, ip, ip.OptAttributes);
 909                                 }
 910                         }
 911
 912                         if (defined_events != null) {
 913                                 foreach (InterfaceEvent ie in defined_events) {
 914                                         EmitContext ec = new EmitContext (tc, this, Location, null,
 915                                                                           null, ModFlags, false);
 916
 917                                         if (ie.OptAttributes != null)
 918                                                 Attribute.ApplyAttributes (ec, ie.Builder, ie, ie.OptAttributes);
 919                                 }
 920                         }
 921                 }
 922
 923                 public static CustomAttributeBuilder EmitDefaultMemberAttr (TypeContainer parent,
 924                                                                             string name,
 925                                                                             int flags,
 926                                                                             Location loc)
 927                 {
 928                         EmitContext ec = new EmitContext (parent, loc, null, null, flags);
 929
 930                         Expression ml = Expression.MemberLookup (ec, TypeManager.default_member_type,
 931                                                                  ".ctor", MemberTypes.Constructor,
 932                                                                  BindingFlags.Public | BindingFlags.Instance,
 933                                                                  Location.Null);
 934
 935                         if (!(ml is MethodGroupExpr)) {
 936                                 Console.WriteLine ("Internal error !!!!");
 937                                 return null;
 938                         }
 939
 940                         MethodGroupExpr mg = (MethodGroupExpr) ml;
 941
 942                         MethodBase constructor = mg.Methods [0];
 943
 944                         string [] vals = { name };
 945
 946                         CustomAttributeBuilder cb = null;
 947                         try {
 948                                 cb = new CustomAttributeBuilder ((ConstructorInfo) constructor, vals);
 949                         } catch {
 950                                 Report.Warning (-100, "Can not set the indexer default member attribute");
 951                         }
 952
 953                         return cb;
 954                 }
 955
 956                 //
 957                 // IMemberContainer
 958                 //
 959
 960                 string IMemberContainer.Name {
 961                         get {
 962                                 return Name;
 963                         }
 964                 }
 965
 966                 Type IMemberContainer.Type {
 967                         get {
 968                                 return TypeBuilder;
 969                         }
 970                 }
 971
 972                 IMemberContainer IMemberContainer.Parent {
 973                         get {
 974                                 return parent_container;
 975                         }
 976                 }
 977
 978                 MemberCache IMemberContainer.MemberCache {
 979                         get {
 980                                 return member_cache;
 981                         }
 982                 }
 983
 984                 bool IMemberContainer.IsInterface {
 985                         get {
 986                                 return true;
 987                         }
 988                 }
 989
 990                 MemberList IMemberContainer.GetMembers (MemberTypes mt, BindingFlags bf)
 991                 {
 992                         // Interfaces only contain instance members.
 993                         if ((bf & BindingFlags.Instance) == 0)
 994                                 return MemberList.Empty;
 995                         if ((bf & BindingFlags.Public) == 0)
 996                                 return MemberList.Empty;
 997
 998                         ArrayList members = new ArrayList ();
 999
1000                         if ((mt & MemberTypes.Method) != 0)
1001                                 members.AddRange (method_builders);
1002
1003                         if ((mt & MemberTypes.Property) != 0)
1004                                 members.AddRange (property_builders);
1005
1006                         if ((mt & MemberTypes.Event) != 0)
1007                                 members.AddRange (event_builders);
1008
1009                         return new MemberList (members);
1010                 }
1011         }
1012
1013         public class InterfaceMemberBase {
1014                 public readonly string Name;
1015                 public readonly bool IsNew;
1016                 public Attributes OptAttributes;
1017
1018                 public InterfaceMemberBase (string name, bool is_new, Attributes attrs)
1019                 {
1020                         Name = name;
1021                         IsNew = is_new;
1022                         OptAttributes = attrs;
1023                 }
1024         }
1025
1026         public class InterfaceProperty : InterfaceMemberBase {
1027                 public readonly bool HasSet;
1028                 public readonly bool HasGet;
1029                 public readonly Location Location;
1030                 public Expression Type;
1031                 public PropertyBuilder Builder;
1032
1033                 public InterfaceProperty (Expression type, string name,
1034                                           bool is_new, bool has_get, bool has_set,
1035                                           Attributes attrs, Location loc)
1036                         : base (name, is_new, attrs)
1037                 {
1038                         Type = type;
1039                         HasGet = has_get;
1040                         HasSet = has_set;
1041                         Location = loc;
1042                 }
1043         }
1044
1045         public class InterfaceEvent : InterfaceMemberBase {
1046                 public readonly Location Location;
1047                 public Expression Type;
1048                 public MyEventBuilder Builder;
1049
1050                 public InterfaceEvent (Expression type, string name, bool is_new, Attributes attrs,
1051                                        Location loc)
1052                         : base (name, is_new, attrs)
1053                 {
1054                         Type = type;
1055                         Location = loc;
1056                 }
1057         }
1058
1059         public class InterfaceMethod : InterfaceMemberBase {
1060                 public Expression ReturnType;
1061                 public readonly Parameters Parameters;
1062                 public readonly Location Location;
1063                 public MethodBuilder Builder;
1064
1065                 public InterfaceMethod (Expression return_type, string name, bool is_new, Parameters args,
1066                                         Attributes attrs, Location l)
1067                         : base (name, is_new, attrs)
1068                 {
1069                         this.ReturnType = return_type;
1070                         this.Parameters = args;
1071                         Location = l;
1072                 }
1073
1074                 /// <summary>
1075                 ///   Returns the signature for this interface method
1076                 /// </summary>
1077                 public string GetSignature (DeclSpace ds)
1078                 {
1079                         ReturnType = ds.ResolveTypeExpr (ReturnType, false, Location);
1080                         if (ReturnType == null)
1081                                 return null;
1082
1083                         Type ret = ReturnType.Type;
1084                         string args = Parameters.GetSignature (ds);
1085
1086                         if ((ret == null) || (args == null))
1087                                 return null;
1088
1089                         return (IsNew ? "new-" : "") + ret.FullName + "(" + args + ")";
1090                 }
1091
1092                 public Type [] ParameterTypes (DeclSpace ds)
1093                 {
1094                         return Parameters.GetParameterInfo (ds);
1095                 }
1096         }
1097
1098         public class InterfaceIndexer : InterfaceMemberBase {
1099                 public readonly bool HasGet, HasSet;
1100                 public readonly Parameters Parameters;
1101                 public readonly Location Location;
1102                 public Expression Type;
1103                 public PropertyBuilder Builder;
1104
1105                 public InterfaceIndexer (Expression type, Parameters args, bool do_get, bool do_set,
1106                                          bool is_new, Attributes attrs, Location loc)
1107                         : base ("", is_new, attrs)
1108                 {
1109                         Type = type;
1110                         Parameters = args;
1111                         HasGet = do_get;
1112                         HasSet = do_set;
1113                         Location = loc;
1114                 }
1115
1116                 public Type [] ParameterTypes (DeclSpace ds)
1117                 {
1118                         return Parameters.GetParameterInfo (ds);
1119                 }
1120         }
1121 }