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