mcs/mcs/property.cs

   1 //
   2 // property.cs: Property based handlers
   3 //
   4 // Authors: Miguel de Icaza (miguel@gnu.org)
   5 //          Martin Baulig (martin@ximian.com)
   6 //          Marek Safar (marek.safar@seznam.cz)
   7 //
   8 // Dual licensed under the terms of the MIT X11 or GNU GPL
   9 //
  10 // Copyright 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
  11 // Copyright 2004-2008 Novell, Inc
  12 //
  13
  14 using System;
  15 using System.Collections.Generic;
  16 using System.Reflection;
  17 using System.Reflection.Emit;
  18 using System.Runtime.CompilerServices;
  19 using System.Runtime.InteropServices;
  20 using System.Security;
  21 using System.Security.Permissions;
  22 using System.Text;
  23
  24 #if NET_2_1
  25 using XmlElement = System.Object;
  26 #else
  27 using System.Xml;
  28 #endif
  29
  30 using Mono.CompilerServices.SymbolWriter;
  31
  32 namespace Mono.CSharp
  33 {
  34         // It is used as a base class for all property based members
  35         // This includes properties, indexers, and events
  36         public abstract class PropertyBasedMember : InterfaceMemberBase
  37         {
  38                 public PropertyBasedMember (DeclSpace parent, GenericMethod generic,
  39                         FullNamedExpression type, Modifiers mod, Modifiers allowed_mod,
  40                         MemberName name, Attributes attrs)
  41                         : base (parent, generic, type, mod, allowed_mod, name, attrs)
  42                 {
  43                 }
  44
  45                 protected override bool VerifyClsCompliance ()
  46                 {
  47                         if (!base.VerifyClsCompliance ())
  48                                 return false;
  49
  50                         if (!AttributeTester.IsClsCompliant (MemberType)) {
  51                                 Report.Warning (3003, 1, Location, "Type of `{0}' is not CLS-compliant",
  52                                         GetSignatureForError ());
  53                         }
  54                         return true;
  55                 }
  56
  57         }
  58
  59         //
  60         // `set' and `get' accessors are represented with an Accessor.
  61         //
  62         public class Accessor {
  63                 //
  64                 // Null if the accessor is empty, or a Block if not
  65                 //
  66                 public const Modifiers AllowedModifiers =
  67                         Modifiers.PUBLIC |
  68                         Modifiers.PROTECTED |
  69                         Modifiers.INTERNAL |
  70                         Modifiers.PRIVATE;
  71
  72                 public ToplevelBlock Block;
  73                 public Attributes Attributes;
  74                 public Location Location;
  75                 public Modifiers ModFlags;
  76                 public ParametersCompiled Parameters;
  77
  78                 public Accessor (ToplevelBlock b, Modifiers mod, Attributes attrs, ParametersCompiled p, Location loc)
  79                 {
  80                         Block = b;
  81                         Attributes = attrs;
  82                         Location = loc;
  83                         Parameters = p;
  84                         ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, 0, loc, RootContext.ToplevelTypes.Compiler.Report);
  85                 }
  86         }
  87
  88         public class PropertySpec : MemberSpec
  89         {
  90                 PropertyInfo info;
  91
  92                 public PropertySpec (MemberKind kind, IMemberDefinition definition, PropertyInfo info, Modifiers modifiers)
  93                         : base (kind, definition, info.Name, modifiers)
  94                 {
  95                         this.info = info;
  96                 }
  97
  98                 public override Type DeclaringType {
  99                         get { return info.DeclaringType; }
 100                 }
 101
 102                 public PropertyInfo MetaInfo {
 103                         get { return info; }
 104                 }
 105
 106                 public Type PropertyType {
 107                         get { return info.PropertyType; }
 108                 }
 109         }
 110
 111         //
 112         // Properties and Indexers both generate PropertyBuilders, we use this to share
 113         // their common bits.
 114         //
 115         abstract public class PropertyBase : PropertyBasedMember {
 116
 117                 public class GetMethod : PropertyMethod
 118                 {
 119                         static string[] attribute_targets = new string [] { "method", "return" };
 120
 121                         public GetMethod (PropertyBase method):
 122                                 base (method, "get_")
 123                         {
 124                         }
 125
 126                         public GetMethod (PropertyBase method, Accessor accessor):
 127                                 base (method, accessor, "get_")
 128                         {
 129                         }
 130
 131                         public override MethodBuilder Define (DeclSpace parent)
 132                         {
 133                                 base.Define (parent);
 134
 135                                 if (IsDummy)
 136                                         return null;
 137
 138                                 method_data = new MethodData (method, ModFlags, flags, this);
 139
 140                                 if (!method_data.Define (parent, method.GetFullName (MemberName), Report))
 141                                         return null;
 142
 143                                 Spec = new MethodSpec (MemberKind.Method, this, method_data.MethodBuilder, ParameterInfo, ModFlags);
 144
 145                                 return method_data.MethodBuilder;
 146                         }
 147
 148                         public override Type ReturnType {
 149                                 get {
 150                                         return method.MemberType;
 151                                 }
 152                         }
 153
 154                         public override ParametersCompiled ParameterInfo {
 155                                 get {
 156                                         return ParametersCompiled.EmptyReadOnlyParameters;
 157                                 }
 158                         }
 159
 160                         public override string[] ValidAttributeTargets {
 161                                 get {
 162                                         return attribute_targets;
 163                                 }
 164                         }
 165                 }
 166
 167                 public class SetMethod : PropertyMethod {
 168
 169                         static string[] attribute_targets = new string [] { "method", "param", "return" };
 170                         ImplicitParameter param_attr;
 171                         protected ParametersCompiled parameters;
 172
 173                         public SetMethod (PropertyBase method) :
 174                                 base (method, "set_")
 175                         {
 176                                 parameters = new ParametersCompiled (Compiler,
 177                                         new Parameter (method.type_name, "value", Parameter.Modifier.NONE, null, Location));
 178                         }
 179
 180                         public SetMethod (PropertyBase method, Accessor accessor):
 181                                 base (method, accessor, "set_")
 182                         {
 183                                 this.parameters = accessor.Parameters;
 184                         }
 185
 186                         protected override void ApplyToExtraTarget (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
 187                         {
 188                                 if (a.Target == AttributeTargets.Parameter) {
 189                                         if (param_attr == null)
 190                                                 param_attr = new ImplicitParameter (method_data.MethodBuilder);
 191
 192                                         param_attr.ApplyAttributeBuilder (a, cb, pa);
 193                                         return;
 194                                 }
 195
 196                                 base.ApplyAttributeBuilder (a, cb, pa);
 197                         }
 198
 199                         public override ParametersCompiled ParameterInfo {
 200                             get {
 201                                 return parameters;
 202                             }
 203                         }
 204
 205                         public override MethodBuilder Define (DeclSpace parent)
 206                         {
 207                                 parameters.Resolve (this);
 208
 209                                 base.Define (parent);
 210
 211                                 if (IsDummy)
 212                                         return null;
 213
 214                                 method_data = new MethodData (method, ModFlags, flags, this);
 215
 216                                 if (!method_data.Define (parent, method.GetFullName (MemberName), Report))
 217                                         return null;
 218
 219                                 Spec = new MethodSpec (MemberKind.Method, this, method_data.MethodBuilder, ParameterInfo, ModFlags);
 220
 221                                 return method_data.MethodBuilder;
 222                         }
 223
 224                         public override Type ReturnType {
 225                                 get {
 226                                         return TypeManager.void_type;
 227                                 }
 228                         }
 229
 230                         public override string[] ValidAttributeTargets {
 231                                 get {
 232                                         return attribute_targets;
 233                                 }
 234                         }
 235                 }
 236
 237                 static string[] attribute_targets = new string [] { "property" };
 238
 239                 public abstract class PropertyMethod : AbstractPropertyEventMethod
 240                 {
 241                         protected readonly PropertyBase method;
 242                         protected MethodAttributes flags;
 243
 244                         public PropertyMethod (PropertyBase method, string prefix)
 245                                 : base (method, prefix)
 246                         {
 247                                 this.method = method;
 248                                 this.ModFlags = method.ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE);
 249                         }
 250
 251                         public PropertyMethod (PropertyBase method, Accessor accessor,
 252                                                string prefix)
 253                                 : base (method, accessor, prefix)
 254                         {
 255                                 this.method = method;
 256                                 this.ModFlags = accessor.ModFlags | (method.ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE));
 257
 258                                 if (accessor.ModFlags != 0 && RootContext.Version == LanguageVersion.ISO_1) {
 259                                         Report.FeatureIsNotAvailable (Location, "access modifiers on properties");
 260                                 }
 261                         }
 262
 263                         public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
 264                         {
 265                                 if (a.IsInternalMethodImplAttribute) {
 266                                         method.is_external_implementation = true;
 267                                 }
 268
 269                                 base.ApplyAttributeBuilder (a, cb, pa);
 270                         }
 271
 272                         public override AttributeTargets AttributeTargets {
 273                                 get {
 274                                         return AttributeTargets.Method;
 275                                 }
 276                         }
 277
 278                         public override bool IsClsComplianceRequired ()
 279                         {
 280                                 return method.IsClsComplianceRequired ();
 281                         }
 282
 283                         public virtual MethodBuilder Define (DeclSpace parent)
 284                         {
 285                                 CheckForDuplications ();
 286
 287                                 if (IsDummy) {
 288                                         if (method.InterfaceType != null && parent.PartialContainer.PendingImplementations != null) {
 289                                                 MethodInfo mi = parent.PartialContainer.PendingImplementations.IsInterfaceMethod (
 290                                                         MethodName.Name, method.InterfaceType, new MethodData (method, ModFlags, flags, this));
 291                                                 if (mi != null) {
 292                                                         Report.SymbolRelatedToPreviousError (mi);
 293                                                         Report.Error (551, Location, "Explicit interface implementation `{0}' is missing accessor `{1}'",
 294                                                                 method.GetSignatureForError (), TypeManager.CSharpSignature (mi, true));
 295                                                 }
 296                                         }
 297                                         return null;
 298                                 }
 299
 300                                 TypeContainer container = parent.PartialContainer;
 301
 302                                 //
 303                                 // Check for custom access modifier
 304                                 //
 305                                 if ((ModFlags & Modifiers.AccessibilityMask) == 0) {
 306                                         ModFlags |= method.ModFlags;
 307                                         flags = method.flags;
 308                                 } else {
 309                                         if (container.Kind == MemberKind.Interface)
 310                                                 Report.Error (275, Location, "`{0}': accessibility modifiers may not be used on accessors in an interface",
 311                                                         GetSignatureForError ());
 312
 313                                         if ((method.ModFlags & Modifiers.ABSTRACT) != 0 && (ModFlags & Modifiers.PRIVATE) != 0) {
 314                                                 Report.Error (442, Location, "`{0}': abstract properties cannot have private accessors", GetSignatureForError ());
 315                                         }
 316
 317                                         CheckModifiers (ModFlags);
 318                                         ModFlags |= (method.ModFlags & (~Modifiers.AccessibilityMask));
 319                                         ModFlags |= Modifiers.PROPERTY_CUSTOM;
 320                                         flags = ModifiersExtensions.MethodAttr (ModFlags);
 321                                         flags |= (method.flags & (~MethodAttributes.MemberAccessMask));
 322                                 }
 323
 324                                 CheckAbstractAndExtern (block != null);
 325                                 CheckProtectedModifier ();
 326
 327                                 if (block != null && block.IsIterator)
 328                                         Iterator.CreateIterator (this, Parent.PartialContainer, ModFlags, Compiler);
 329
 330                                 return null;
 331                         }
 332
 333                         public bool HasCustomAccessModifier {
 334                                 get {
 335                                         return (ModFlags & Modifiers.PROPERTY_CUSTOM) != 0;
 336                                 }
 337                         }
 338
 339                         public PropertyBase Property {
 340                                 get {
 341                                         return method;
 342                                 }
 343                         }
 344
 345                         public override ObsoleteAttribute GetObsoleteAttribute ()
 346                         {
 347                                 return method.GetObsoleteAttribute ();
 348                         }
 349
 350                         public override string GetSignatureForError()
 351                         {
 352                                 return method.GetSignatureForError () + '.' + prefix.Substring (0, 3);
 353                         }
 354
 355                         void CheckModifiers (Modifiers modflags)
 356                         {
 357                                 modflags &= Modifiers.AccessibilityMask;
 358                                 Modifiers flags = 0;
 359                                 Modifiers mflags = method.ModFlags & Modifiers.AccessibilityMask;
 360
 361                                 if ((mflags & Modifiers.PUBLIC) != 0) {
 362                                         flags |= Modifiers.PROTECTED | Modifiers.INTERNAL | Modifiers.PRIVATE;
 363                                 }
 364                                 else if ((mflags & Modifiers.PROTECTED) != 0) {
 365                                         if ((mflags & Modifiers.INTERNAL) != 0)
 366                                                 flags |= Modifiers.PROTECTED | Modifiers.INTERNAL;
 367
 368                                         flags |= Modifiers.PRIVATE;
 369                                 } else if ((mflags & Modifiers.INTERNAL) != 0)
 370                                         flags |= Modifiers.PRIVATE;
 371
 372                                 if ((mflags == modflags) || (modflags & (~flags)) != 0) {
 373                                         Report.Error (273, Location,
 374                                                 "The accessibility modifier of the `{0}' accessor must be more restrictive than the modifier of the property or indexer `{1}'",
 375                                                 GetSignatureForError (), method.GetSignatureForError ());
 376                                 }
 377                         }
 378
 379                         protected bool CheckForDuplications ()
 380                         {
 381                                 if ((caching_flags & Flags.MethodOverloadsExist) == 0)
 382                                         return true;
 383
 384                                 return Parent.MemberCache.CheckExistingMembersOverloads (this, Name, ParameterInfo, Report);
 385                         }
 386                 }
 387
 388                 public PropertyMethod Get, Set;
 389                 public PropertyBuilder PropertyBuilder;
 390                 public MethodBuilder GetBuilder, SetBuilder;
 391
 392                 protected bool define_set_first = false;
 393
 394                 public PropertyBase (DeclSpace parent, FullNamedExpression type, Modifiers mod_flags,
 395                                      Modifiers allowed_mod, MemberName name,
 396                                      Attributes attrs, bool define_set_first)
 397                         : base (parent, null, type, mod_flags, allowed_mod, name, attrs)
 398                 {
 399                          this.define_set_first = define_set_first;
 400                 }
 401
 402                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
 403                 {
 404                         if (a.HasSecurityAttribute) {
 405                                 a.Error_InvalidSecurityParent ();
 406                                 return;
 407                         }
 408
 409                         if (a.Type == pa.Dynamic) {
 410                                 a.Error_MisusedDynamicAttribute ();
 411                                 return;
 412                         }
 413
 414                         PropertyBuilder.SetCustomAttribute (cb);
 415                 }
 416
 417                 public override AttributeTargets AttributeTargets {
 418                         get {
 419                                 return AttributeTargets.Property;
 420                         }
 421                 }
 422
 423                 protected override void DoMemberTypeDependentChecks ()
 424                 {
 425                         base.DoMemberTypeDependentChecks ();
 426
 427                         IsTypePermitted ();
 428 #if MS_COMPATIBLE
 429                         if (MemberType.IsGenericParameter)
 430                                 return;
 431 #endif
 432
 433                         if ((MemberType.Attributes & Class.StaticClassAttribute) == Class.StaticClassAttribute) {
 434                                 Report.Error (722, Location, Error722, TypeManager.CSharpName (MemberType));
 435                         }
 436                 }
 437
 438                 protected override void DoMemberTypeIndependentChecks ()
 439                 {
 440                         base.DoMemberTypeIndependentChecks ();
 441
 442                         //
 443                         // Accessors modifiers check
 444                         //
 445                         if ((Get.ModFlags & Modifiers.AccessibilityMask) != 0 &&
 446                                 (Set.ModFlags & Modifiers.AccessibilityMask) != 0) {
 447                                 Report.Error (274, Location, "`{0}': Cannot specify accessibility modifiers for both accessors of the property or indexer",
 448                                                 GetSignatureForError ());
 449                         }
 450
 451                         if ((ModFlags & Modifiers.OVERRIDE) == 0 &&
 452                                 (Get.IsDummy && (Set.ModFlags & Modifiers.AccessibilityMask) != 0) ||
 453                                 (Set.IsDummy && (Get.ModFlags & Modifiers.AccessibilityMask) != 0)) {
 454                                 Report.Error (276, Location,
 455                                               "`{0}': accessibility modifiers on accessors may only be used if the property or indexer has both a get and a set accessor",
 456                                               GetSignatureForError ());
 457                         }
 458                 }
 459
 460                 bool DefineGet ()
 461                 {
 462                         GetBuilder = Get.Define (Parent);
 463                         return (Get.IsDummy) ? true : GetBuilder != null;
 464                 }
 465
 466                 bool DefineSet (bool define)
 467                 {
 468                         if (!define)
 469                                 return true;
 470
 471                         SetBuilder = Set.Define (Parent);
 472                         return (Set.IsDummy) ? true : SetBuilder != null;
 473                 }
 474
 475                 protected bool DefineAccessors ()
 476                 {
 477                         return DefineSet (define_set_first) &&
 478                                 DefineGet () &&
 479                                 DefineSet (!define_set_first);
 480                 }
 481
 482                 protected void DefineBuilders (MemberKind kind, Type[] parameterTypes)
 483                 {
 484                         // FIXME - PropertyAttributes.HasDefault ?
 485
 486                         PropertyBuilder = Parent.TypeBuilder.DefineProperty (
 487                                 GetFullName (MemberName), PropertyAttributes.None, MemberType, parameterTypes);
 488
 489                         if (!Get.IsDummy) {
 490                                 PropertyBuilder.SetGetMethod (GetBuilder);
 491                                 Parent.MemberCache.AddMember (GetBuilder, Get.Spec);
 492                         }
 493
 494                         if (!Set.IsDummy) {
 495                                 PropertyBuilder.SetSetMethod (SetBuilder);
 496                                 Parent.MemberCache.AddMember (SetBuilder, Set.Spec);
 497                         }
 498
 499                         var spec = new PropertySpec (kind, this, PropertyBuilder, ModFlags);
 500                         Parent.MemberCache.AddMember (PropertyBuilder, spec);
 501                 }
 502
 503                 protected abstract PropertyInfo ResolveBaseProperty ();
 504
 505                 // TODO: rename to Resolve......
 506                 protected override MethodInfo FindOutBaseMethod (ref Type base_ret_type)
 507                 {
 508                         PropertyInfo base_property = ResolveBaseProperty ();
 509                         if (base_property == null)
 510                                 return null;
 511
 512                         base_ret_type = base_property.PropertyType;
 513                         MethodInfo get_accessor = base_property.GetGetMethod (true);
 514                         MethodInfo set_accessor = base_property.GetSetMethod (true);
 515                         MethodAttributes get_accessor_access = 0, set_accessor_access = 0;
 516
 517                         //
 518                         // Check base property accessors conflict
 519                         //
 520                         if ((ModFlags & (Modifiers.OVERRIDE | Modifiers.NEW)) == Modifiers.OVERRIDE) {
 521                                 if (get_accessor == null) {
 522                                         if (Get != null && !Get.IsDummy) {
 523                                                 Report.SymbolRelatedToPreviousError (base_property);
 524                                                 Report.Error (545, Location,
 525                                                         "`{0}.get': cannot override because `{1}' does not have an overridable get accessor",
 526                                                         GetSignatureForError (), TypeManager.GetFullNameSignature (base_property));
 527                                         }
 528                                 } else {
 529                                         get_accessor_access = get_accessor.Attributes & MethodAttributes.MemberAccessMask;
 530
 531                                         if (!Get.IsDummy && !CheckAccessModifiers (
 532                                                 ModifiersExtensions.MethodAttr (Get.ModFlags) & MethodAttributes.MemberAccessMask, get_accessor_access, get_accessor))
 533                                                 Error_CannotChangeAccessModifiers (Get.Location, get_accessor, get_accessor_access, ".get");
 534                                 }
 535
 536                                 if (set_accessor == null) {
 537                                         if (Set != null && !Set.IsDummy) {
 538                                                 Report.SymbolRelatedToPreviousError (base_property);
 539                                                 Report.Error (546, Location,
 540                                                         "`{0}.set': cannot override because `{1}' does not have an overridable set accessor",
 541                                                         GetSignatureForError (), TypeManager.GetFullNameSignature (base_property));
 542                                         }
 543                                 } else {
 544                                         set_accessor_access = set_accessor.Attributes & MethodAttributes.MemberAccessMask;
 545
 546                                         if (!Set.IsDummy && !CheckAccessModifiers (
 547                                                 ModifiersExtensions.MethodAttr (Set.ModFlags) & MethodAttributes.MemberAccessMask, set_accessor_access, set_accessor))
 548                                                 Error_CannotChangeAccessModifiers (Set.Location, set_accessor, set_accessor_access, ".set");
 549                                 }
 550                         }
 551
 552                         // When one accessor does not exist and property hides base one
 553                         // we need to propagate this upwards
 554                         if (set_accessor == null)
 555                                 set_accessor = get_accessor;
 556
 557                         //
 558                         // Get the less restrictive access
 559                         //
 560                         return get_accessor_access > set_accessor_access ? get_accessor : set_accessor;
 561                 }
 562
 563                 public override void Emit ()
 564                 {
 565                         //
 566                         // The PropertyBuilder can be null for explicit implementations, in that
 567                         // case, we do not actually emit the ".property", so there is nowhere to
 568                         // put the attribute
 569                         //
 570                         if (PropertyBuilder != null) {
 571                                 if (OptAttributes != null)
 572                                         OptAttributes.Emit ();
 573
 574                                 if (TypeManager.IsDynamicType (member_type)) {
 575                                         PredefinedAttributes.Get.Dynamic.EmitAttribute (PropertyBuilder);
 576                                 } else {
 577                                         var trans_flags = TypeManager.HasDynamicTypeUsed (member_type);
 578                                         if (trans_flags != null) {
 579                                                 var pa = PredefinedAttributes.Get.DynamicTransform;
 580                                                 if (pa.Constructor != null || pa.ResolveConstructor (Location, TypeManager.bool_type.MakeArrayType ())) {
 581                                                         PropertyBuilder.SetCustomAttribute (
 582                                                                 new CustomAttributeBuilder (pa.Constructor, new object [] { trans_flags }));
 583                                                 }
 584                                         }
 585                                 }
 586                         }
 587
 588                         if (!Get.IsDummy)
 589                                 Get.Emit (Parent);
 590
 591                         if (!Set.IsDummy)
 592                                 Set.Emit (Parent);
 593
 594                         base.Emit ();
 595                 }
 596
 597                 /// <summary>
 598                 /// Tests whether accessors are not in collision with some method (CS0111)
 599                 /// </summary>
 600                 public bool AreAccessorsDuplicateImplementation (MethodCore mc)
 601                 {
 602                         return Get.IsDuplicateImplementation (mc) || Set.IsDuplicateImplementation (mc);
 603                 }
 604
 605                 public override bool IsUsed
 606                 {
 607                         get {
 608                                 if (IsExplicitImpl)
 609                                         return true;
 610
 611                                 return Get.IsUsed | Set.IsUsed;
 612                         }
 613                 }
 614
 615                 protected override void SetMemberName (MemberName new_name)
 616                 {
 617                         base.SetMemberName (new_name);
 618
 619                         Get.UpdateName (this);
 620                         Set.UpdateName (this);
 621                 }
 622
 623                 public override string[] ValidAttributeTargets {
 624                         get {
 625                                 return attribute_targets;
 626                         }
 627                 }
 628
 629                 //
 630                 //   Represents header string for documentation comment.
 631                 //
 632                 public override string DocCommentHeader {
 633                         get { return "P:"; }
 634                 }
 635         }
 636
 637         public class Property : PropertyBase
 638         {
 639                 public sealed class BackingField : Field
 640                 {
 641                         readonly Property property;
 642
 643                         public BackingField (Property p)
 644                                 : base (p.Parent, p.type_name,
 645                                 Modifiers.BACKING_FIELD | Modifiers.COMPILER_GENERATED | Modifiers.PRIVATE | (p.ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE)),
 646                                 new MemberName ("<" + p.GetFullName (p.MemberName) + ">k__BackingField", p.Location), null)
 647                         {
 648                                 this.property = p;
 649                         }
 650
 651                         public override string GetSignatureForError ()
 652                         {
 653                                 return property.GetSignatureForError ();
 654                         }
 655                 }
 656
 657                 const Modifiers AllowedModifiers =
 658                         Modifiers.NEW |
 659                         Modifiers.PUBLIC |
 660                         Modifiers.PROTECTED |
 661                         Modifiers.INTERNAL |
 662                         Modifiers.PRIVATE |
 663                         Modifiers.STATIC |
 664                         Modifiers.SEALED |
 665                         Modifiers.OVERRIDE |
 666                         Modifiers.ABSTRACT |
 667                         Modifiers.UNSAFE |
 668                         Modifiers.EXTERN |
 669                         Modifiers.VIRTUAL;
 670
 671                 const Modifiers AllowedInterfaceModifiers =
 672                         Modifiers.NEW;
 673
 674                 public Property (DeclSpace parent, FullNamedExpression type, Modifiers mod,
 675                                  MemberName name, Attributes attrs, Accessor get_block,
 676                                  Accessor set_block, bool define_set_first)
 677                         : this (parent, type, mod, name, attrs, get_block, set_block,
 678                                 define_set_first, null)
 679                 {
 680                 }
 681
 682                 public Property (DeclSpace parent, FullNamedExpression type, Modifiers mod,
 683                                  MemberName name, Attributes attrs, Accessor get_block,
 684                                  Accessor set_block, bool define_set_first, Block current_block)
 685                         : base (parent, type, mod,
 686                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedInterfaceModifiers : AllowedModifiers,
 687                                 name, attrs, define_set_first)
 688                 {
 689                         if (get_block == null)
 690                                 Get = new GetMethod (this);
 691                         else
 692                                 Get = new GetMethod (this, get_block);
 693
 694                         if (set_block == null)
 695                                 Set = new SetMethod (this);
 696                         else
 697                                 Set = new SetMethod (this, set_block);
 698
 699                         if (!IsInterface && (mod & (Modifiers.ABSTRACT | Modifiers.EXTERN)) == 0 &&
 700                                 get_block != null && get_block.Block == null &&
 701                                 set_block != null && set_block.Block == null) {
 702                                 if (RootContext.Version <= LanguageVersion.ISO_2)
 703                                         Report.FeatureIsNotAvailable (Location, "automatically implemented properties");
 704
 705                                 Get.ModFlags |= Modifiers.COMPILER_GENERATED;
 706                                 Set.ModFlags |= Modifiers.COMPILER_GENERATED;
 707                         }
 708                 }
 709
 710                 void CreateAutomaticProperty ()
 711                 {
 712                         // Create backing field
 713                         Field field = new BackingField (this);
 714                         if (!field.Define ())
 715                                 return;
 716
 717                         Parent.PartialContainer.AddField (field);
 718
 719                         FieldExpr fe = new FieldExpr (field, Location);
 720                         if ((field.ModFlags & Modifiers.STATIC) == 0)
 721                                 fe.InstanceExpression = new CompilerGeneratedThis (fe.Type, Location);
 722
 723                         // Create get block
 724                         Get.Block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location);
 725                         Return r = new Return (fe, Location);
 726                         Get.Block.AddStatement (r);
 727
 728                         // Create set block
 729                         Set.Block = new ToplevelBlock (Compiler, Set.ParameterInfo, Location);
 730                         Assign a = new SimpleAssign (fe, new SimpleName ("value", Location));
 731                         Set.Block.AddStatement (new StatementExpression (a));
 732                 }
 733
 734                 public override bool Define ()
 735                 {
 736                         if (!base.Define ())
 737                                 return false;
 738
 739                         flags |= MethodAttributes.HideBySig | MethodAttributes.SpecialName;
 740
 741                         if ((Get.ModFlags & Modifiers.COMPILER_GENERATED) != 0)
 742                                 CreateAutomaticProperty ();
 743
 744                         if (!DefineAccessors ())
 745                                 return false;
 746
 747                         if (!CheckBase ())
 748                                 return false;
 749
 750                         DefineBuilders (MemberKind.Property, null);
 751                         TypeManager.RegisterProperty (PropertyBuilder, this);
 752                         return true;
 753                 }
 754
 755                 public override void Emit ()
 756                 {
 757                         if (((Set.ModFlags | Get.ModFlags) & (Modifiers.STATIC | Modifiers.COMPILER_GENERATED)) == Modifiers.COMPILER_GENERATED && Parent.PartialContainer.HasExplicitLayout) {
 758                                 Report.Error (842, Location,
 759                                         "Automatically implemented property `{0}' cannot be used inside a type with an explicit StructLayout attribute",
 760                                         GetSignatureForError ());
 761                         }
 762
 763                         base.Emit ();
 764                 }
 765
 766                 protected override PropertyInfo ResolveBaseProperty ()
 767                 {
 768                         return Parent.PartialContainer.BaseCache.FindMemberToOverride (
 769                                 Parent.TypeBuilder, Name, ParametersCompiled.EmptyReadOnlyParameters, null, true) as PropertyInfo;
 770                 }
 771         }
 772
 773         /// </summary>
 774         ///  Gigantic workaround  for lameness in SRE follows :
 775         ///  This class derives from EventInfo and attempts to basically
 776         ///  wrap around the EventBuilder so that FindMembers can quickly
 777         ///  return this in it search for members
 778         /// </summary>
 779         public class MyEventBuilder : EventInfo {
 780
 781                 //
 782                 // We use this to "point" to our Builder which is
 783                 // not really a MemberInfo
 784                 //
 785                 EventBuilder MyBuilder;
 786
 787                 //
 788                 // We "catch" and wrap these methods
 789                 //
 790                 MethodInfo raise, remove, add;
 791
 792                 EventAttributes attributes;
 793                 Type declaring_type, reflected_type, event_type;
 794                 string name;
 795
 796                 Event my_event;
 797
 798                 public MyEventBuilder (Event ev, TypeBuilder type_builder, string name, EventAttributes event_attr, Type event_type)
 799                 {
 800                         MyBuilder = type_builder.DefineEvent (name, event_attr, event_type);
 801
 802                         // And now store the values in our own fields.
 803
 804                         declaring_type = type_builder;
 805
 806                         reflected_type = type_builder;
 807
 808                         attributes = event_attr;
 809                         this.name = name;
 810                         my_event = ev;
 811                         this.event_type = event_type;
 812                 }
 813
 814                 //
 815                 // Methods that you have to override.  Note that you only need
 816                 // to "implement" the variants that take the argument (those are
 817                 // the "abstract" methods, the others (GetAddMethod()) are
 818                 // regular.
 819                 //
 820                 public override MethodInfo GetAddMethod (bool nonPublic)
 821                 {
 822                         return add;
 823                 }
 824
 825                 public override MethodInfo GetRemoveMethod (bool nonPublic)
 826                 {
 827                         return remove;
 828                 }
 829
 830                 public override MethodInfo GetRaiseMethod (bool nonPublic)
 831                 {
 832                         return raise;
 833                 }
 834
 835                 //
 836                 // These methods make "MyEventInfo" look like a Builder
 837                 //
 838                 public void SetRaiseMethod (MethodBuilder raiseMethod)
 839                 {
 840                         raise = raiseMethod;
 841                         MyBuilder.SetRaiseMethod (raiseMethod);
 842                 }
 843
 844                 public void SetRemoveOnMethod (MethodBuilder removeMethod)
 845                 {
 846                         remove = removeMethod;
 847                         MyBuilder.SetRemoveOnMethod (removeMethod);
 848                 }
 849
 850                 public void SetAddOnMethod (MethodBuilder addMethod)
 851                 {
 852                         add = addMethod;
 853                         MyBuilder.SetAddOnMethod (addMethod);
 854                 }
 855
 856                 public void SetCustomAttribute (CustomAttributeBuilder cb)
 857                 {
 858                         MyBuilder.SetCustomAttribute (cb);
 859                 }
 860
 861                 public override object [] GetCustomAttributes (bool inherit)
 862                 {
 863                         // FIXME : There's nothing which can be seemingly done here because
 864                         // we have no way of getting at the custom attribute objects of the
 865                         // EventBuilder !
 866                         return null;
 867                 }
 868
 869                 public override object [] GetCustomAttributes (Type t, bool inherit)
 870                 {
 871                         // FIXME : Same here !
 872                         return null;
 873                 }
 874
 875                 public override bool IsDefined (Type t, bool b)
 876                 {
 877                         return true;
 878                 }
 879
 880                 public override EventAttributes Attributes {
 881                         get {
 882                                 return attributes;
 883                         }
 884                 }
 885
 886                 public override string Name {
 887                         get {
 888                                 return name;
 889                         }
 890                 }
 891
 892                 public override Type DeclaringType {
 893                         get {
 894                                 return declaring_type;
 895                         }
 896                 }
 897
 898                 public override Type ReflectedType {
 899                         get {
 900                                 return reflected_type;
 901                         }
 902                 }
 903
 904                 public Type EventType {
 905                         get {
 906                                 return event_type;
 907                         }
 908                 }
 909
 910                 public void SetUsed ()
 911                 {
 912                         if (my_event != null) {
 913 //                              my_event.SetAssigned ();
 914                                 my_event.SetIsUsed ();
 915                         }
 916                 }
 917         }
 918
 919         /// <summary>
 920         /// For case when event is declared like property (with add and remove accessors).
 921         /// </summary>
 922         public class EventProperty: Event {
 923                 abstract class AEventPropertyAccessor : AEventAccessor
 924                 {
 925                         protected AEventPropertyAccessor (EventProperty method, Accessor accessor, string prefix)
 926                                 : base (method, accessor, prefix)
 927                         {
 928                         }
 929
 930                         public override MethodBuilder Define (DeclSpace ds)
 931                         {
 932                                 CheckAbstractAndExtern (block != null);
 933                                 return base.Define (ds);
 934                         }
 935
 936                         public override string GetSignatureForError ()
 937                         {
 938                                 return method.GetSignatureForError () + "." + prefix.Substring (0, prefix.Length - 1);
 939                         }
 940                 }
 941
 942                 sealed class AddDelegateMethod: AEventPropertyAccessor
 943                 {
 944                         public AddDelegateMethod (EventProperty method, Accessor accessor):
 945                                 base (method, accessor, AddPrefix)
 946                         {
 947                         }
 948                 }
 949
 950                 sealed class RemoveDelegateMethod: AEventPropertyAccessor
 951                 {
 952                         public RemoveDelegateMethod (EventProperty method, Accessor accessor):
 953                                 base (method, accessor, RemovePrefix)
 954                         {
 955                         }
 956                 }
 957
 958
 959                 static readonly string[] attribute_targets = new string [] { "event" }; // "property" target was disabled for 2.0 version
 960
 961                 public EventProperty (DeclSpace parent, FullNamedExpression type, Modifiers mod_flags,
 962                                       MemberName name,
 963                                       Attributes attrs, Accessor add, Accessor remove)
 964                         : base (parent, type, mod_flags, name, attrs)
 965                 {
 966                         Add = new AddDelegateMethod (this, add);
 967                         Remove = new RemoveDelegateMethod (this, remove);
 968                 }
 969
 970                 public override bool Define()
 971                 {
 972                         if (!base.Define ())
 973                                 return false;
 974
 975                         SetIsUsed ();
 976                         return true;
 977                 }
 978
 979                 public override string[] ValidAttributeTargets {
 980                         get {
 981                                 return attribute_targets;
 982                         }
 983                 }
 984         }
 985
 986         /// <summary>
 987         /// Event is declared like field.
 988         /// </summary>
 989         public class EventField : Event {
 990                 abstract class EventFieldAccessor : AEventAccessor
 991                 {
 992                         protected EventFieldAccessor (EventField method, string prefix)
 993                                 : base (method, prefix)
 994                         {
 995                         }
 996
 997                         public override void Emit (DeclSpace parent)
 998                         {
 999                                 if ((method.ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN)) == 0) {
1000                                         if (parent is Class) {
1001                                                 MethodBuilder mb = method_data.MethodBuilder;
1002                                                 mb.SetImplementationFlags (mb.GetMethodImplementationFlags () | MethodImplAttributes.Synchronized);
1003                                         }
1004
1005                                         var field_info = ((EventField) method).BackingField;
1006                                         FieldExpr f_expr = new FieldExpr (field_info, Location);
1007                                         if ((method.ModFlags & Modifiers.STATIC) == 0)
1008                                                 f_expr.InstanceExpression = new CompilerGeneratedThis (field_info.Spec.FieldType, Location);
1009
1010                                         block = new ToplevelBlock (Compiler, ParameterInfo, Location);
1011                                         block.AddStatement (new StatementExpression (
1012                                                 new CompoundAssign (Operation,
1013                                                         f_expr,
1014                                                         block.GetParameterReference (ParameterInfo[0].Name, Location))));
1015                                 }
1016
1017                                 base.Emit (parent);
1018                         }
1019
1020                         protected abstract Binary.Operator Operation { get; }
1021                 }
1022
1023                 sealed class AddDelegateMethod: EventFieldAccessor
1024                 {
1025                         public AddDelegateMethod (EventField method):
1026                                 base (method, AddPrefix)
1027                         {
1028                         }
1029
1030                         protected override Binary.Operator Operation {
1031                                 get { return Binary.Operator.Addition; }
1032                         }
1033                 }
1034
1035                 sealed class RemoveDelegateMethod: EventFieldAccessor
1036                 {
1037                         public RemoveDelegateMethod (EventField method):
1038                                 base (method, RemovePrefix)
1039                         {
1040                         }
1041
1042                         protected override Binary.Operator Operation {
1043                                 get { return Binary.Operator.Subtraction; }
1044                         }
1045                 }
1046
1047
1048                 static readonly string[] attribute_targets = new string [] { "event", "field", "method" };
1049                 static readonly string[] attribute_targets_interface = new string[] { "event", "method" };
1050
1051                 public Field BackingField;
1052                 public Expression Initializer;
1053
1054                 public EventField (DeclSpace parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
1055                         : base (parent, type, mod_flags, name, attrs)
1056                 {
1057                         Add = new AddDelegateMethod (this);
1058                         Remove = new RemoveDelegateMethod (this);
1059                 }
1060
1061                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
1062                 {
1063                         if (a.Target == AttributeTargets.Field) {
1064                                 BackingField.ApplyAttributeBuilder (a, cb, pa);
1065                                 return;
1066                         }
1067
1068                         if (a.Target == AttributeTargets.Method) {
1069                                 int errors = Report.Errors;
1070                                 Add.ApplyAttributeBuilder (a, cb, pa);
1071                                 if (errors == Report.Errors)
1072                                         Remove.ApplyAttributeBuilder (a, cb, pa);
1073                                 return;
1074                         }
1075
1076                         base.ApplyAttributeBuilder (a, cb, pa);
1077                 }
1078
1079                 public override bool Define()
1080                 {
1081                         if (!base.Define ())
1082                                 return false;
1083
1084                         if (Initializer != null && (ModFlags & Modifiers.ABSTRACT) != 0) {
1085                                 Report.Error (74, Location, "`{0}': abstract event cannot have an initializer",
1086                                         GetSignatureForError ());
1087                         }
1088
1089                         if (!HasBackingField) {
1090                                 SetIsUsed ();
1091                                 return true;
1092                         }
1093
1094                         // FIXME: We are unable to detect whether generic event is used because
1095                         // we are using FieldExpr instead of EventExpr for event access in that
1096                         // case.  When this issue will be fixed this hack can be removed.
1097                         if (TypeManager.IsGenericType (MemberType) || Parent.IsGeneric)
1098                                 SetIsUsed ();
1099
1100                         if (Add.IsInterfaceImplementation)
1101                                 SetIsUsed ();
1102
1103                         BackingField = new Field (Parent,
1104                                 new TypeExpression (MemberType, Location),
1105                                 Modifiers.BACKING_FIELD | Modifiers.COMPILER_GENERATED | Modifiers.PRIVATE | (ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE)),
1106                                 MemberName, null);
1107
1108                         Parent.PartialContainer.AddField (BackingField);
1109                         BackingField.Initializer = Initializer;
1110                         BackingField.ModFlags &= ~Modifiers.COMPILER_GENERATED;
1111
1112                         // Call define because we passed fields definition
1113                         return BackingField.Define ();
1114                 }
1115
1116                 public bool HasBackingField {
1117                         get {
1118                                 return !IsInterface && (ModFlags & Modifiers.ABSTRACT) == 0;
1119                         }
1120                 }
1121
1122                 public override string[] ValidAttributeTargets {
1123                         get {
1124                                 return HasBackingField ? attribute_targets : attribute_targets_interface;
1125                         }
1126                 }
1127         }
1128
1129         public abstract class Event : PropertyBasedMember {
1130                 public abstract class AEventAccessor : AbstractPropertyEventMethod
1131                 {
1132                         protected readonly Event method;
1133                         ImplicitParameter param_attr;
1134
1135                         static readonly string[] attribute_targets = new string [] { "method", "param", "return" };
1136
1137                         public const string AddPrefix = "add_";
1138                         public const string RemovePrefix = "remove_";
1139
1140                         protected AEventAccessor (Event method, string prefix)
1141                                 : base (method, prefix)
1142                         {
1143                                 this.method = method;
1144                                 this.ModFlags = method.ModFlags;
1145                         }
1146
1147                         protected AEventAccessor (Event method, Accessor accessor, string prefix)
1148                                 : base (method, accessor, prefix)
1149                         {
1150                                 this.method = method;
1151                                 this.ModFlags = method.ModFlags;
1152                         }
1153
1154                         public bool IsInterfaceImplementation {
1155                                 get { return method_data.implementing != null; }
1156                         }
1157
1158                         public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
1159                         {
1160                                 if (a.IsInternalMethodImplAttribute) {
1161                                         method.is_external_implementation = true;
1162                                 }
1163
1164                                 base.ApplyAttributeBuilder (a, cb, pa);
1165                         }
1166
1167                         protected override void ApplyToExtraTarget (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
1168                         {
1169                                 if (a.Target == AttributeTargets.Parameter) {
1170                                         if (param_attr == null)
1171                                                 param_attr = new ImplicitParameter (method_data.MethodBuilder);
1172
1173                                         param_attr.ApplyAttributeBuilder (a, cb, pa);
1174                                         return;
1175                                 }
1176
1177                                 base.ApplyAttributeBuilder (a, cb, pa);
1178                         }
1179
1180                         public override AttributeTargets AttributeTargets {
1181                                 get {
1182                                         return AttributeTargets.Method;
1183                                 }
1184                         }
1185
1186                         public override bool IsClsComplianceRequired ()
1187                         {
1188                                 return method.IsClsComplianceRequired ();
1189                         }
1190
1191                         public virtual MethodBuilder Define (DeclSpace parent)
1192                         {
1193                                 method_data = new MethodData (method, method.ModFlags,
1194                                         method.flags | MethodAttributes.HideBySig | MethodAttributes.SpecialName, this);
1195
1196                                 if (!method_data.Define (parent, method.GetFullName (MemberName), Report))
1197                                         return null;
1198
1199                                 MethodBuilder mb = method_data.MethodBuilder;
1200                                 ParameterInfo.ApplyAttributes (mb);
1201                                 Spec = new MethodSpec (MemberKind.Method, this, mb, ParameterInfo, method.ModFlags);
1202
1203                                 return mb;
1204                         }
1205
1206                         public override Type ReturnType {
1207                                 get {
1208                                         return TypeManager.void_type;
1209                                 }
1210                         }
1211
1212                         public override ObsoleteAttribute GetObsoleteAttribute ()
1213                         {
1214                                 return method.GetObsoleteAttribute ();
1215                         }
1216
1217                         public override string[] ValidAttributeTargets {
1218                                 get {
1219                                         return attribute_targets;
1220                                 }
1221                         }
1222
1223                         public override ParametersCompiled ParameterInfo {
1224                                 get {
1225                                         return method.parameters;
1226                                 }
1227                         }
1228                 }
1229
1230
1231                 const Modifiers AllowedModifiers =
1232                         Modifiers.NEW |
1233                         Modifiers.PUBLIC |
1234                         Modifiers.PROTECTED |
1235                         Modifiers.INTERNAL |
1236                         Modifiers.PRIVATE |
1237                         Modifiers.STATIC |
1238                         Modifiers.VIRTUAL |
1239                         Modifiers.SEALED |
1240                         Modifiers.OVERRIDE |
1241                         Modifiers.UNSAFE |
1242                         Modifiers.ABSTRACT |
1243                         Modifiers.EXTERN;
1244
1245                 const Modifiers AllowedInterfaceModifiers =
1246                         Modifiers.NEW;
1247
1248                 public AEventAccessor Add, Remove;
1249                 public MyEventBuilder     EventBuilder;
1250                 public MethodBuilder AddBuilder, RemoveBuilder;
1251
1252                 ParametersCompiled parameters;
1253
1254                 protected Event (DeclSpace parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
1255                         : base (parent, null, type, mod_flags,
1256                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedInterfaceModifiers : AllowedModifiers,
1257                                 name, attrs)
1258                 {
1259                 }
1260
1261                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa)
1262                 {
1263                         if ((a.HasSecurityAttribute)) {
1264                                 a.Error_InvalidSecurityParent ();
1265                                 return;
1266                         }
1267
1268                         EventBuilder.SetCustomAttribute (cb);
1269                 }
1270
1271                 public bool AreAccessorsDuplicateImplementation (MethodCore mc)
1272                 {
1273                         return Add.IsDuplicateImplementation (mc) || Remove.IsDuplicateImplementation (mc);
1274                 }
1275
1276                 public override AttributeTargets AttributeTargets {
1277                         get {
1278                                 return AttributeTargets.Event;
1279                         }
1280                 }
1281
1282                 public override bool Define ()
1283                 {
1284                         if (!base.Define ())
1285                                 return false;
1286
1287                         if (!TypeManager.IsDelegateType (MemberType)) {
1288                                 Report.Error (66, Location, "`{0}': event must be of a delegate type", GetSignatureForError ());
1289                         }
1290
1291                         parameters = ParametersCompiled.CreateFullyResolved (
1292                                 new Parameter (null, "value", Parameter.Modifier.NONE, null, Location), MemberType);
1293
1294                         if (!CheckBase ())
1295                                 return false;
1296
1297                         if (TypeManager.delegate_combine_delegate_delegate == null) {
1298                                 TypeManager.delegate_combine_delegate_delegate = TypeManager.GetPredefinedMethod (
1299                                         TypeManager.delegate_type, "Combine", Location,
1300                                         TypeManager.delegate_type, TypeManager.delegate_type);
1301                         }
1302                         if (TypeManager.delegate_remove_delegate_delegate == null) {
1303                                 TypeManager.delegate_remove_delegate_delegate = TypeManager.GetPredefinedMethod (
1304                                         TypeManager.delegate_type, "Remove", Location,
1305                                         TypeManager.delegate_type, TypeManager.delegate_type);
1306                         }
1307
1308                         //
1309                         // Now define the accessors
1310                         //
1311
1312                         AddBuilder = Add.Define (Parent);
1313                         if (AddBuilder == null)
1314                                 return false;
1315
1316                         RemoveBuilder = Remove.Define (Parent);
1317                         if (RemoveBuilder == null)
1318                                 return false;
1319
1320                         EventBuilder = new MyEventBuilder (this, Parent.TypeBuilder, Name, EventAttributes.None, MemberType);
1321                         EventBuilder.SetAddOnMethod (AddBuilder);
1322                         EventBuilder.SetRemoveOnMethod (RemoveBuilder);
1323
1324                         var spec = new EventSpec (this, EventBuilder, ModFlags, Add.Spec, Remove.Spec) {
1325                                 EventType = MemberType
1326                         };
1327
1328                         TypeManager.RegisterEventField (EventBuilder, spec);
1329
1330                         Parent.MemberCache.AddMember (EventBuilder, spec);
1331                         Parent.MemberCache.AddMember (AddBuilder, Add.Spec);
1332                         Parent.MemberCache.AddMember (RemoveBuilder, Remove.Spec);
1333
1334                         return true;
1335                 }
1336
1337                 public override void Emit ()
1338                 {
1339                         if (OptAttributes != null) {
1340                                 OptAttributes.Emit ();
1341                         }
1342
1343                         Add.Emit (Parent);
1344                         Remove.Emit (Parent);
1345
1346                         base.Emit ();
1347                 }
1348
1349                 protected override MethodInfo FindOutBaseMethod (ref Type base_ret_type)
1350                 {
1351                         MethodInfo mi = (MethodInfo) Parent.PartialContainer.BaseCache.FindBaseEvent (
1352                                 Parent.TypeBuilder, Name);
1353
1354                         if (mi == null)
1355                                 return null;
1356
1357                         AParametersCollection pd = TypeManager.GetParameterData (mi);
1358                         base_ret_type = pd.Types [0];
1359                         return mi;
1360                 }
1361
1362                 //
1363                 //   Represents header string for documentation comment.
1364                 //
1365                 public override string DocCommentHeader {
1366                         get { return "E:"; }
1367                 }
1368         }
1369
1370         public class EventSpec : MemberSpec
1371         {
1372                 EventInfo info;
1373
1374                 public EventSpec (IMemberDefinition definition, EventInfo info, Modifiers modifiers, MethodSpec add, MethodSpec remove)
1375                         : base (MemberKind.Event, definition, info.Name, modifiers)
1376                 {
1377                         this.info = info;
1378                         this.AccessorAdd = add;
1379                         this.AccessorRemove = remove;
1380
1381                         // TODO MemberCache: Remove
1382                         if (TypeManager.IsBeingCompiled (info))
1383                                 state &= ~MemberSpec.StateFlags.Obsolete_Undetected;
1384                 }
1385
1386                 public MethodSpec AccessorAdd { get; private set; }
1387                 public MethodSpec AccessorRemove { get; private set; }
1388
1389                 public override Type DeclaringType {
1390                         get { return info.DeclaringType; }
1391                 }
1392
1393                 public Type EventType { get; set; }
1394
1395                 public bool IsAbstract {
1396                         get { return (Modifiers & Modifiers.ABSTRACT) != 0; }
1397                 }
1398
1399                 public EventInfo MetaInfo {
1400                         get { return info; }
1401                 }
1402         }
1403
1404         public class Indexer : PropertyBase
1405         {
1406                 public class GetIndexerMethod : GetMethod
1407                 {
1408                         ParametersCompiled parameters;
1409
1410                         public GetIndexerMethod (Indexer method):
1411                                 base (method)
1412                         {
1413                                 this.parameters = method.parameters;
1414                         }
1415
1416                         public GetIndexerMethod (PropertyBase method, Accessor accessor):
1417                                 base (method, accessor)
1418                         {
1419                                 parameters = accessor.Parameters;
1420                         }
1421
1422                         public override MethodBuilder Define (DeclSpace parent)
1423                         {
1424                                 parameters.Resolve (this);
1425                                 return base.Define (parent);
1426                         }
1427
1428                         public override bool EnableOverloadChecks (MemberCore overload)
1429                         {
1430                                 if (base.EnableOverloadChecks (overload)) {
1431                                         overload.caching_flags |= Flags.MethodOverloadsExist;
1432                                         return true;
1433                                 }
1434
1435                                 return false;
1436                         }
1437
1438                         public override ParametersCompiled ParameterInfo {
1439                                 get {
1440                                         return parameters;
1441                                 }
1442                         }
1443                 }
1444
1445                 public class SetIndexerMethod: SetMethod
1446                 {
1447                         public SetIndexerMethod (Indexer method):
1448                                 base (method)
1449                         {
1450                                 parameters = ParametersCompiled.MergeGenerated (Compiler, method.parameters, false, parameters [0], null);
1451                         }
1452
1453                         public SetIndexerMethod (PropertyBase method, Accessor accessor):
1454                                 base (method, accessor)
1455                         {
1456                                 parameters = method.Get.IsDummy ? accessor.Parameters : accessor.Parameters.Clone ();
1457                         }
1458
1459                         public override bool EnableOverloadChecks (MemberCore overload)
1460                         {
1461                                 if (base.EnableOverloadChecks (overload)) {
1462                                         overload.caching_flags |= Flags.MethodOverloadsExist;
1463                                         return true;
1464                                 }
1465
1466                                 return false;
1467                         }
1468                 }
1469
1470                 const Modifiers AllowedModifiers =
1471                         Modifiers.NEW |
1472                         Modifiers.PUBLIC |
1473                         Modifiers.PROTECTED |
1474                         Modifiers.INTERNAL |
1475                         Modifiers.PRIVATE |
1476                         Modifiers.VIRTUAL |
1477                         Modifiers.SEALED |
1478                         Modifiers.OVERRIDE |
1479                         Modifiers.UNSAFE |
1480                         Modifiers.EXTERN |
1481                         Modifiers.ABSTRACT;
1482
1483                 const Modifiers AllowedInterfaceModifiers =
1484                         Modifiers.NEW;
1485
1486                 public readonly ParametersCompiled parameters;
1487
1488                 public Indexer (DeclSpace parent, FullNamedExpression type, MemberName name, Modifiers mod,
1489                                 ParametersCompiled parameters, Attributes attrs,
1490                                 Accessor get_block, Accessor set_block, bool define_set_first)
1491                         : base (parent, type, mod,
1492                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedInterfaceModifiers : AllowedModifiers,
1493                                 name, attrs, define_set_first)
1494                 {
1495                         this.parameters = parameters;
1496
1497                         if (get_block == null)
1498                                 Get = new GetIndexerMethod (this);
1499                         else
1500                                 Get = new GetIndexerMethod (this, get_block);
1501
1502                         if (set_block == null)
1503                                 Set = new SetIndexerMethod (this);
1504                         else
1505                                 Set = new SetIndexerMethod (this, set_block);
1506                 }
1507
1508                 protected override bool CheckForDuplications ()
1509                 {
1510                         return Parent.MemberCache.CheckExistingMembersOverloads (this, GetFullName (MemberName), parameters, Report);
1511                 }
1512
1513                 public override bool Define ()
1514                 {
1515                         if (!base.Define ())
1516                                 return false;
1517
1518                         if (!DefineParameters (parameters))
1519                                 return false;
1520
1521                         if (OptAttributes != null) {
1522                                 Attribute indexer_attr = OptAttributes.Search (PredefinedAttributes.Get.IndexerName);
1523                                 if (indexer_attr != null) {
1524                                         // Remove the attribute from the list because it is not emitted
1525                                         OptAttributes.Attrs.Remove (indexer_attr);
1526
1527                                         string name = indexer_attr.GetIndexerAttributeValue ();
1528                                         if (name == null)
1529                                                 return false;
1530
1531                                         ShortName = name;
1532
1533                                         if (IsExplicitImpl) {
1534                                                 Report.Error (415, indexer_attr.Location,
1535                                                               "The `IndexerName' attribute is valid only on an " +
1536                                                               "indexer that is not an explicit interface member declaration");
1537                                                 return false;
1538                                         }
1539
1540                                         if ((ModFlags & Modifiers.OVERRIDE) != 0) {
1541                                                 Report.Error (609, indexer_attr.Location,
1542                                                               "Cannot set the `IndexerName' attribute on an indexer marked override");
1543                                                 return false;
1544                                         }
1545                                 }
1546                         }
1547
1548                         if (InterfaceType != null) {
1549                                 string base_IndexerName = TypeManager.IndexerPropertyName (InterfaceType);
1550                                 if (base_IndexerName != Name)
1551                                         ShortName = base_IndexerName;
1552                         }
1553
1554                         if (!Parent.PartialContainer.AddMember (this) ||
1555                                 !Parent.PartialContainer.AddMember (Get) || !Parent.PartialContainer.AddMember (Set))
1556                                 return false;
1557
1558                         flags |= MethodAttributes.HideBySig | MethodAttributes.SpecialName;
1559
1560                         if (!DefineAccessors ())
1561                                 return false;
1562
1563                         if (!CheckBase ())
1564                                 return false;
1565
1566                         DefineBuilders (MemberKind.Indexer, parameters.GetEmitTypes ());
1567                         TypeManager.RegisterIndexer (PropertyBuilder, parameters);
1568                         return true;
1569                 }
1570
1571                 public override bool EnableOverloadChecks (MemberCore overload)
1572                 {
1573                         if (overload is Indexer) {
1574                                 caching_flags |= Flags.MethodOverloadsExist;
1575                                 return true;
1576                         }
1577
1578                         return base.EnableOverloadChecks (overload);
1579                 }
1580
1581                 public override string GetDocCommentName (DeclSpace ds)
1582                 {
1583                         return DocUtil.GetMethodDocCommentName (this, parameters, ds);
1584                 }
1585
1586                 public override string GetSignatureForError ()
1587                 {
1588                         StringBuilder sb = new StringBuilder (Parent.GetSignatureForError ());
1589                         if (MemberName.Left != null) {
1590                                 sb.Append ('.');
1591                                 sb.Append (MemberName.Left.GetSignatureForError ());
1592                         }
1593
1594                         sb.Append (".this");
1595                         sb.Append (parameters.GetSignatureForError ().Replace ('(', '[').Replace (')', ']'));
1596                         return sb.ToString ();
1597                 }
1598
1599                 protected override PropertyInfo ResolveBaseProperty ()
1600                 {
1601                         return Parent.PartialContainer.BaseCache.FindMemberToOverride (
1602                                 Parent.TypeBuilder, Name, parameters, null, true) as PropertyInfo;
1603                 }
1604
1605                 protected override bool VerifyClsCompliance ()
1606                 {
1607                         if (!base.VerifyClsCompliance ())
1608                                 return false;
1609
1610                         parameters.VerifyClsCompliance (this);
1611                         return true;
1612                 }
1613         }
1614 }