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 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, false);
  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                                         if (ok) {
 525                                                 Report.SymbolRelatedToPreviousError (base_prop);
 526                                                 Report.Error (545, Get.Location,
 527                                                         "`{0}': cannot override because `{1}' does not have an overridable get accessor",
 528                                                         Get.GetSignatureForError (), base_prop.GetSignatureForError ());
 529                                                 ok = false;
 530                                         }
 531                                 } else if (Get.HasCustomAccessModifier || base_prop.HasDifferentAccessibility) {
 532                                         if (!CheckAccessModifiers (Get, base_prop.Get)) {
 533                                                 Error_CannotChangeAccessModifiers (Get, base_prop.Get);
 534                                                 ok = false;
 535                                         }
 536                                 }
 537                         }
 538
 539                         if (Set != null) {
 540                                 if (!base_prop.HasSet) {
 541                                         if (ok) {
 542                                                 Report.SymbolRelatedToPreviousError (base_prop);
 543                                                 Report.Error (546, Set.Location,
 544                                                         "`{0}': cannot override because `{1}' does not have an overridable set accessor",
 545                                                         Set.GetSignatureForError (), base_prop.GetSignatureForError ());
 546                                                 ok = false;
 547                                         }
 548                                 } else if (Set.HasCustomAccessModifier || base_prop.HasDifferentAccessibility) {
 549                                         if (!CheckAccessModifiers (Set, base_prop.Set)) {
 550                                                 Error_CannotChangeAccessModifiers (Set, base_prop.Set);
 551                                                 ok = false;
 552                                         }
 553                                 }
 554                         }
 555
 556                         if ((Set == null || !Set.HasCustomAccessModifier) && (Get == null || !Get.HasCustomAccessModifier)) {
 557                                 if (!CheckAccessModifiers (this, base_prop)) {
 558                                         Error_CannotChangeAccessModifiers (this, base_prop);
 559                                         ok = false;
 560                                 }
 561                         }
 562
 563                         return ok;
 564                 }
 565
 566                 protected override void DoMemberTypeDependentChecks ()
 567                 {
 568                         base.DoMemberTypeDependentChecks ();
 569
 570                         IsTypePermitted ();
 571
 572                         if (MemberType.IsStatic)
 573                                 Error_StaticReturnType ();
 574                 }
 575
 576                 protected override void DoMemberTypeIndependentChecks ()
 577                 {
 578                         base.DoMemberTypeIndependentChecks ();
 579
 580                         //
 581                         // Accessors modifiers check
 582                         //
 583                         if (AccessorSecond != null) {
 584                                 if ((Get.ModFlags & Modifiers.AccessibilityMask) != 0 && (Set.ModFlags & Modifiers.AccessibilityMask) != 0) {
 585                                         Report.Error (274, Location, "`{0}': Cannot specify accessibility modifiers for both accessors of the property or indexer",
 586                                                 GetSignatureForError ());
 587                                 }
 588                         } else if ((ModFlags & Modifiers.OVERRIDE) == 0 &&
 589                                 (Get == null && (Set.ModFlags & Modifiers.AccessibilityMask) != 0) ||
 590                                 (Set == null && (Get.ModFlags & Modifiers.AccessibilityMask) != 0)) {
 591                                 Report.Error (276, Location,
 592                                               "`{0}': accessibility modifiers on accessors may only be used if the property or indexer has both a get and a set accessor",
 593                                               GetSignatureForError ());
 594                         }
 595                 }
 596
 597                 protected bool DefineAccessors ()
 598                 {
 599                         first.Define (Parent);
 600                         if (AccessorSecond != null)
 601                                 AccessorSecond.Define (Parent);
 602
 603                         return true;
 604                 }
 605
 606                 protected void DefineBuilders (MemberKind kind, ParametersCompiled parameters)
 607                 {
 608                         PropertyBuilder = Parent.TypeBuilder.DefineProperty (
 609                                 GetFullName (MemberName), PropertyAttributes.None,
 610 #if !BOOTSTRAP_BASIC    // Requires trunk version mscorlib
 611                                 IsStatic ? 0 : CallingConventions.HasThis,
 612 #endif
 613                                 MemberType.GetMetaInfo (), null, null,
 614                                 parameters.GetMetaInfo (), null, null);
 615
 616                         PropertySpec spec;
 617                         if (kind == MemberKind.Indexer)
 618                                 spec = new IndexerSpec (Parent.Definition, this, MemberType, parameters, PropertyBuilder, ModFlags);
 619                         else
 620                                 spec = new PropertySpec (kind, Parent.Definition, this, MemberType, PropertyBuilder, ModFlags);
 621
 622                         if (Get != null) {
 623                                 spec.Get = Get.Spec;
 624
 625                                 var method = Get.Spec.GetMetaInfo () as MethodBuilder;
 626                                 if (method != null) {
 627                                         PropertyBuilder.SetGetMethod (method);
 628                                         Parent.MemberCache.AddMember (this, method.Name, Get.Spec);
 629                                 }
 630                         } else {
 631                                 CheckMissingAccessor (kind, parameters, true);
 632                         }
 633
 634                         if (Set != null) {
 635                                 spec.Set = Set.Spec;
 636
 637                                 var method = Set.Spec.GetMetaInfo () as MethodBuilder;
 638                                 if (method != null) {
 639                                         PropertyBuilder.SetSetMethod (method);
 640                                         Parent.MemberCache.AddMember (this, method.Name, Set.Spec);
 641                                 }
 642                         } else {
 643                                 CheckMissingAccessor (kind, parameters, false);
 644                         }
 645
 646                         Parent.MemberCache.AddMember (this, PropertyBuilder.Name, spec);
 647                 }
 648
 649                 public override void Emit ()
 650                 {
 651                         CheckReservedNameConflict (GetMethod.Prefix, get == null ? null : get.Spec);
 652                         CheckReservedNameConflict (SetMethod.Prefix, set == null ? null : set.Spec);
 653
 654                         if (OptAttributes != null)
 655                                 OptAttributes.Emit ();
 656
 657                         if (member_type == InternalType.Dynamic) {
 658                                 PredefinedAttributes.Get.Dynamic.EmitAttribute (PropertyBuilder);
 659                         } else {
 660                                 var trans_flags = TypeManager.HasDynamicTypeUsed (member_type);
 661                                 if (trans_flags != null) {
 662                                         var pa = PredefinedAttributes.Get.DynamicTransform;
 663                                         if (pa.Constructor != null || pa.ResolveConstructor (Location, ArrayContainer.MakeType (TypeManager.bool_type))) {
 664                                                 PropertyBuilder.SetCustomAttribute (
 665                                                         new CustomAttributeBuilder (pa.Constructor, new object[] { trans_flags }));
 666                                         }
 667                                 }
 668                         }
 669
 670                         first.Emit (Parent);
 671                         if (AccessorSecond != null)
 672                                 AccessorSecond.Emit (Parent);
 673
 674                         base.Emit ();
 675                 }
 676
 677                 public override bool IsUsed {
 678                         get {
 679                                 if (IsExplicitImpl)
 680                                         return true;
 681
 682                                 return Get.IsUsed | Set.IsUsed;
 683                         }
 684                 }
 685
 686                 protected override void SetMemberName (MemberName new_name)
 687                 {
 688                         base.SetMemberName (new_name);
 689
 690                         if (Get != null)
 691                                 Get.UpdateName (this);
 692
 693                         if (Set != null)
 694                                 Set.UpdateName (this);
 695                 }
 696
 697                 //
 698                 //   Represents header string for documentation comment.
 699                 //
 700                 public override string DocCommentHeader {
 701                         get { return "P:"; }
 702                 }
 703         }
 704
 705         public class Property : PropertyBase
 706         {
 707                 public sealed class BackingField : Field
 708                 {
 709                         readonly Property property;
 710
 711                         public BackingField (Property p)
 712                                 : base (p.Parent, p.type_expr,
 713                                 Modifiers.BACKING_FIELD | Modifiers.COMPILER_GENERATED | Modifiers.PRIVATE | (p.ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE)),
 714                                 new MemberName ("<" + p.GetFullName (p.MemberName) + ">k__BackingField", p.Location), null)
 715                         {
 716                                 this.property = p;
 717                         }
 718
 719                         public string OriginalName {
 720                                 get {
 721                                         return property.Name;
 722                                 }
 723                         }
 724
 725                         public override string GetSignatureForError ()
 726                         {
 727                                 return property.GetSignatureForError ();
 728                         }
 729                 }
 730
 731                 public Property (DeclSpace parent, FullNamedExpression type, Modifiers mod,
 732                                  MemberName name, Attributes attrs)
 733                         : base (parent, type, mod,
 734                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedModifiersInterface :
 735                                 parent.PartialContainer.Kind == MemberKind.Struct ? AllowedModifiersStruct :
 736                                 AllowedModifiersClass,
 737                                 name, attrs)
 738                 {
 739                 }
 740
 741                 void CreateAutomaticProperty ()
 742                 {
 743                         // Create backing field
 744                         Field field = new BackingField (this);
 745                         if (!field.Define ())
 746                                 return;
 747
 748                         Parent.PartialContainer.AddField (field);
 749
 750                         FieldExpr fe = new FieldExpr (field, Location);
 751                         if ((field.ModFlags & Modifiers.STATIC) == 0)
 752                                 fe.InstanceExpression = new CompilerGeneratedThis (fe.Type, Location);
 753
 754                         // Create get block
 755                         Get.Block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location);
 756                         Return r = new Return (fe, Location);
 757                         Get.Block.AddStatement (r);
 758
 759                         // Create set block
 760                         Set.Block = new ToplevelBlock (Compiler, Set.ParameterInfo, Location);
 761                         Assign a = new SimpleAssign (fe, new SimpleName ("value", Location));
 762                         Set.Block.AddStatement (new StatementExpression (a));
 763                 }
 764
 765                 public override bool Define ()
 766                 {
 767                         if (!base.Define ())
 768                                 return false;
 769
 770                         flags |= MethodAttributes.HideBySig | MethodAttributes.SpecialName;
 771
 772                         if (!IsInterface && (ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN)) == 0 &&
 773                                 AccessorSecond != null && Get.Block == null && Set.Block == null) {
 774                                 if (RootContext.Version <= LanguageVersion.ISO_2)
 775                                         Report.FeatureIsNotAvailable (Location, "automatically implemented properties");
 776
 777                                 Get.ModFlags |= Modifiers.COMPILER_GENERATED;
 778                                 Set.ModFlags |= Modifiers.COMPILER_GENERATED;
 779                                 CreateAutomaticProperty ();
 780                         }
 781
 782                         if (!DefineAccessors ())
 783                                 return false;
 784
 785                         if (!CheckBase ())
 786                                 return false;
 787
 788                         DefineBuilders (MemberKind.Property, ParametersCompiled.EmptyReadOnlyParameters);
 789                         return true;
 790                 }
 791
 792                 public override void Emit ()
 793                 {
 794                         if ((AccessorFirst.ModFlags & (Modifiers.STATIC | Modifiers.COMPILER_GENERATED)) == Modifiers.COMPILER_GENERATED && Parent.PartialContainer.HasExplicitLayout) {
 795                                 Report.Error (842, Location,
 796                                         "Automatically implemented property `{0}' cannot be used inside a type with an explicit StructLayout attribute",
 797                                         GetSignatureForError ());
 798                         }
 799
 800                         base.Emit ();
 801                 }
 802
 803                 public override string GetDocCommentName (DeclSpace ds)
 804                 {
 805                         return String.Concat (DocCommentHeader, ds.Name, ".", GetFullName (ShortName).Replace ('.', '#'));
 806                 }
 807         }
 808
 809         /// <summary>
 810         /// For case when event is declared like property (with add and remove accessors).
 811         /// </summary>
 812         public class EventProperty: Event {
 813                 public abstract class AEventPropertyAccessor : AEventAccessor
 814                 {
 815                         protected AEventPropertyAccessor (EventProperty method, string prefix, Attributes attrs, Location loc)
 816                                 : base (method, prefix, attrs, loc)
 817                         {
 818                         }
 819
 820                         public override MethodBuilder Define (DeclSpace ds)
 821                         {
 822                                 CheckAbstractAndExtern (block != null);
 823                                 return base.Define (ds);
 824                         }
 825
 826                         public override string GetSignatureForError ()
 827                         {
 828                                 return method.GetSignatureForError () + "." + prefix.Substring (0, prefix.Length - 1);
 829                         }
 830                 }
 831
 832                 public sealed class AddDelegateMethod: AEventPropertyAccessor
 833                 {
 834                         public AddDelegateMethod (EventProperty method, Attributes attrs, Location loc)
 835                                 : base (method, AddPrefix, attrs, loc)
 836                         {
 837                         }
 838                 }
 839
 840                 public sealed class RemoveDelegateMethod: AEventPropertyAccessor
 841                 {
 842                         public RemoveDelegateMethod (EventProperty method, Attributes attrs, Location loc)
 843                                 : base (method, RemovePrefix, attrs, loc)
 844                         {
 845                         }
 846                 }
 847
 848                 static readonly string[] attribute_targets = new string [] { "event" };
 849
 850                 public EventProperty (DeclSpace parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
 851                         : base (parent, type, mod_flags, name, attrs)
 852                 {
 853                 }
 854
 855                 public override bool Define()
 856                 {
 857                         if (!base.Define ())
 858                                 return false;
 859
 860                         SetIsUsed ();
 861                         return true;
 862                 }
 863
 864                 public override string[] ValidAttributeTargets {
 865                         get {
 866                                 return attribute_targets;
 867                         }
 868                 }
 869         }
 870
 871         /// <summary>
 872         /// Event is declared like field.
 873         /// </summary>
 874         public class EventField : Event {
 875                 abstract class EventFieldAccessor : AEventAccessor
 876                 {
 877                         protected EventFieldAccessor (EventField method, string prefix)
 878                                 : base (method, prefix, null, Location.Null)
 879                         {
 880                         }
 881
 882                         public override void Emit (DeclSpace parent)
 883                         {
 884                                 if ((method.ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN)) == 0) {
 885                                         if (parent is Class) {
 886                                                 MethodBuilder mb = method_data.MethodBuilder;
 887                                                 mb.SetImplementationFlags (mb.GetMethodImplementationFlags () | MethodImplAttributes.Synchronized);
 888                                         }
 889
 890                                         var field_info = ((EventField) method).backing_field;
 891                                         FieldExpr f_expr = new FieldExpr (field_info, Location);
 892                                         if ((method.ModFlags & Modifiers.STATIC) == 0)
 893                                                 f_expr.InstanceExpression = new CompilerGeneratedThis (field_info.Spec.MemberType, Location);
 894
 895                                         block = new ToplevelBlock (Compiler, ParameterInfo, Location);
 896                                         block.AddStatement (new StatementExpression (
 897                                                 new CompoundAssign (Operation,
 898                                                         f_expr,
 899                                                         block.GetParameterReference (ParameterInfo[0].Name, Location),
 900                                                         Location)));
 901                                 }
 902
 903                                 base.Emit (parent);
 904                         }
 905
 906                         protected abstract Binary.Operator Operation { get; }
 907                 }
 908
 909                 sealed class AddDelegateMethod: EventFieldAccessor
 910                 {
 911                         public AddDelegateMethod (EventField method):
 912                                 base (method, AddPrefix)
 913                         {
 914                         }
 915
 916                         protected override Binary.Operator Operation {
 917                                 get { return Binary.Operator.Addition; }
 918                         }
 919                 }
 920
 921                 sealed class RemoveDelegateMethod: EventFieldAccessor
 922                 {
 923                         public RemoveDelegateMethod (EventField method):
 924                                 base (method, RemovePrefix)
 925                         {
 926                         }
 927
 928                         protected override Binary.Operator Operation {
 929                                 get { return Binary.Operator.Subtraction; }
 930                         }
 931                 }
 932
 933
 934                 static readonly string[] attribute_targets = new string [] { "event", "field", "method" };
 935                 static readonly string[] attribute_targets_interface = new string[] { "event", "method" };
 936
 937                 Expression initializer;
 938                 Field backing_field;
 939                 List<FieldDeclarator> declarators;
 940
 941                 public EventField (DeclSpace parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
 942                         : base (parent, type, mod_flags, name, attrs)
 943                 {
 944                         Add = new AddDelegateMethod (this);
 945                         Remove = new RemoveDelegateMethod (this);
 946                 }
 947
 948                 #region Properties
 949
 950                 bool HasBackingField {
 951                         get {
 952                                 return !IsInterface && (ModFlags & Modifiers.ABSTRACT) == 0;
 953                         }
 954                 }
 955
 956                 public Expression Initializer {
 957                         get {
 958                                 return initializer;
 959                         }
 960                         set {
 961                                 initializer = value;
 962                         }
 963                 }
 964
 965                 public override string[] ValidAttributeTargets {
 966                         get {
 967                                 return HasBackingField ? attribute_targets : attribute_targets_interface;
 968                         }
 969                 }
 970
 971                 #endregion
 972
 973                 public void AddDeclarator (FieldDeclarator declarator)
 974                 {
 975                         if (declarators == null)
 976                                 declarators = new List<FieldDeclarator> (2);
 977
 978                         declarators.Add (declarator);
 979
 980                         // TODO: This will probably break
 981                         Parent.AddMember (this, declarator.Name.Value);
 982                 }
 983
 984                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 985                 {
 986                         if (a.Target == AttributeTargets.Field) {
 987                                 backing_field.ApplyAttributeBuilder (a, ctor, cdata, pa);
 988                                 return;
 989                         }
 990
 991                         if (a.Target == AttributeTargets.Method) {
 992                                 int errors = Report.Errors;
 993                                 Add.ApplyAttributeBuilder (a, ctor, cdata, pa);
 994                                 if (errors == Report.Errors)
 995                                         Remove.ApplyAttributeBuilder (a, ctor, cdata, pa);
 996                                 return;
 997                         }
 998
 999                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
1000                 }
1001
1002                 public override bool Define()
1003                 {
1004                         if (!base.Define ())
1005                                 return false;
1006
1007                         if (declarators != null) {
1008                                 var t = new TypeExpression (MemberType, TypeExpression.Location);
1009                                 int index = Parent.PartialContainer.Events.IndexOf (this);
1010                                 foreach (var d in declarators) {
1011                                         var ef = new EventField (Parent, t, ModFlags, new MemberName (d.Name.Value, d.Name.Location), OptAttributes);
1012
1013                                         if (d.Initializer != null)
1014                                                 ef.initializer = d.Initializer;
1015
1016                                         Parent.PartialContainer.Events.Insert (++index, ef);
1017                                 }
1018                         }
1019
1020                         if (!HasBackingField) {
1021                                 SetIsUsed ();
1022                                 return true;
1023                         }
1024
1025                         if (Add.IsInterfaceImplementation)
1026                                 SetIsUsed ();
1027
1028                         backing_field = new Field (Parent,
1029                                 new TypeExpression (MemberType, Location),
1030                                 Modifiers.BACKING_FIELD | Modifiers.COMPILER_GENERATED | Modifiers.PRIVATE | (ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE)),
1031                                 MemberName, null);
1032
1033                         Parent.PartialContainer.AddField (backing_field);
1034                         backing_field.Initializer = Initializer;
1035                         backing_field.ModFlags &= ~Modifiers.COMPILER_GENERATED;
1036
1037                         // Call define because we passed fields definition
1038                         backing_field.Define ();
1039
1040                         // Set backing field for event fields
1041                         spec.BackingField = backing_field.Spec;
1042
1043                         return true;
1044                 }
1045         }
1046
1047         public abstract class Event : PropertyBasedMember {
1048                 public abstract class AEventAccessor : AbstractPropertyEventMethod
1049                 {
1050                         protected readonly Event method;
1051                         ImplicitParameter param_attr;
1052                         ParametersCompiled parameters;
1053
1054                         static readonly string[] attribute_targets = new string [] { "method", "param", "return" };
1055
1056                         public const string AddPrefix = "add_";
1057                         public const string RemovePrefix = "remove_";
1058
1059                         protected AEventAccessor (Event method, string prefix, Attributes attrs, Location loc)
1060                                 : base (method, prefix, attrs, loc)
1061                         {
1062                                 this.method = method;
1063                                 this.ModFlags = method.ModFlags;
1064                                 this.parameters = ParametersCompiled.CreateImplicitParameter (method.TypeExpression, loc);;
1065                         }
1066
1067                         public bool IsInterfaceImplementation {
1068                                 get { return method_data.implementing != null; }
1069                         }
1070
1071                         public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1072                         {
1073                                 if (a.IsInternalMethodImplAttribute) {
1074                                         method.is_external_implementation = true;
1075                                 }
1076
1077                                 base.ApplyAttributeBuilder (a, ctor, cdata, pa);
1078                         }
1079
1080                         protected override void ApplyToExtraTarget (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1081                         {
1082                                 if (a.Target == AttributeTargets.Parameter) {
1083                                         if (param_attr == null)
1084                                                 param_attr = new ImplicitParameter (method_data.MethodBuilder);
1085
1086                                         param_attr.ApplyAttributeBuilder (a, ctor, cdata, pa);
1087                                         return;
1088                                 }
1089
1090                                 base.ApplyAttributeBuilder (a, ctor, cdata, pa);
1091                         }
1092
1093                         public override AttributeTargets AttributeTargets {
1094                                 get {
1095                                         return AttributeTargets.Method;
1096                                 }
1097                         }
1098
1099                         public override bool IsClsComplianceRequired ()
1100                         {
1101                                 return method.IsClsComplianceRequired ();
1102                         }
1103
1104                         public virtual MethodBuilder Define (DeclSpace parent)
1105                         {
1106                                 parameters.Resolve (this);
1107
1108                                 method_data = new MethodData (method, method.ModFlags,
1109                                         method.flags | MethodAttributes.HideBySig | MethodAttributes.SpecialName, this);
1110
1111                                 if (!method_data.Define (parent, method.GetFullName (MemberName), Report))
1112                                         return null;
1113
1114                                 MethodBuilder mb = method_data.MethodBuilder;
1115                                 ParameterInfo.ApplyAttributes (mb);
1116                                 Spec = new MethodSpec (MemberKind.Method, parent.PartialContainer.Definition, this, ReturnType, mb, ParameterInfo, method.ModFlags);
1117                                 Spec.IsAccessor = true;
1118
1119                                 return mb;
1120                         }
1121
1122                         public override TypeSpec ReturnType {
1123                                 get {
1124                                         return TypeManager.void_type;
1125                                 }
1126                         }
1127
1128                         public override ObsoleteAttribute GetAttributeObsolete ()
1129                         {
1130                                 return method.GetAttributeObsolete ();
1131                         }
1132
1133                         public override string[] ValidAttributeTargets {
1134                                 get {
1135                                         return attribute_targets;
1136                                 }
1137                         }
1138
1139                         public override ParametersCompiled ParameterInfo {
1140                                 get {
1141                                         return parameters;
1142                                 }
1143                         }
1144                 }
1145
1146                 AEventAccessor add, remove;
1147                 EventBuilder EventBuilder;
1148                 protected EventSpec spec;
1149
1150                 protected Event (DeclSpace parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
1151                         : base (parent, null, type, mod_flags,
1152                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedModifiersInterface :
1153                                 parent.PartialContainer.Kind == MemberKind.Struct ? AllowedModifiersStruct :
1154                                 AllowedModifiersClass,
1155                                 name, attrs)
1156                 {
1157                 }
1158
1159                 #region Properties
1160
1161                 public override AttributeTargets AttributeTargets {
1162                         get {
1163                                 return AttributeTargets.Event;
1164                         }
1165                 }
1166
1167                 public AEventAccessor Add {
1168                         get {
1169                                 return this.add;
1170                         }
1171                         set {
1172                                 add = value;
1173                                 Parent.AddMember (value);
1174                         }
1175                 }
1176
1177                 public AEventAccessor Remove {
1178                         get {
1179                                 return this.remove;
1180                         }
1181                         set {
1182                                 remove = value;
1183                                 Parent.AddMember (value);
1184                         }
1185                 }
1186                 #endregion
1187
1188                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1189                 {
1190                         if ((a.HasSecurityAttribute)) {
1191                                 a.Error_InvalidSecurityParent ();
1192                                 return;
1193                         }
1194
1195                         EventBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
1196                 }
1197
1198                 protected override bool CheckOverrideAgainstBase (MemberSpec base_member)
1199                 {
1200                         var ok = base.CheckOverrideAgainstBase (base_member);
1201
1202                         if (!CheckAccessModifiers (this, base_member)) {
1203                                 Error_CannotChangeAccessModifiers (this, base_member);
1204                                 ok = false;
1205                         }
1206
1207                         return ok;
1208                 }
1209
1210                 public override bool Define ()
1211                 {
1212                         if (!base.Define ())
1213                                 return false;
1214
1215                         if (!TypeManager.IsDelegateType (MemberType)) {
1216                                 Report.Error (66, Location, "`{0}': event must be of a delegate type", GetSignatureForError ());
1217                         }
1218
1219                         if (!CheckBase ())
1220                                 return false;
1221
1222                         //
1223                         // Now define the accessors
1224                         //
1225                         var AddBuilder = Add.Define (Parent);
1226                         if (AddBuilder == null)
1227                                 return false;
1228
1229                         var RemoveBuilder = remove.Define (Parent);
1230                         if (RemoveBuilder == null)
1231                                 return false;
1232
1233                         EventBuilder = Parent.TypeBuilder.DefineEvent (Name, EventAttributes.None, MemberType.GetMetaInfo ());
1234                         EventBuilder.SetAddOnMethod (AddBuilder);
1235                         EventBuilder.SetRemoveOnMethod (RemoveBuilder);
1236
1237                         spec = new EventSpec (Parent.Definition, this, MemberType, ModFlags, Add.Spec, remove.Spec);
1238
1239                         Parent.MemberCache.AddMember (this, Name, spec);
1240                         Parent.MemberCache.AddMember (this, AddBuilder.Name, Add.Spec);
1241                         Parent.MemberCache.AddMember (this, RemoveBuilder.Name, remove.Spec);
1242
1243                         return true;
1244                 }
1245
1246                 public override void Emit ()
1247                 {
1248                         CheckReservedNameConflict (null, add.Spec);
1249                         CheckReservedNameConflict (null, remove.Spec);
1250
1251                         if (OptAttributes != null) {
1252                                 OptAttributes.Emit ();
1253                         }
1254
1255                         Add.Emit (Parent);
1256                         Remove.Emit (Parent);
1257
1258                         base.Emit ();
1259                 }
1260
1261                 //
1262                 //   Represents header string for documentation comment.
1263                 //
1264                 public override string DocCommentHeader {
1265                         get { return "E:"; }
1266                 }
1267         }
1268
1269         public class EventSpec : MemberSpec, IInterfaceMemberSpec
1270         {
1271                 MethodSpec add, remove;
1272                 FieldSpec backing_field;
1273
1274                 public EventSpec (TypeSpec declaringType, IMemberDefinition definition, TypeSpec eventType, Modifiers modifiers, MethodSpec add, MethodSpec remove)
1275                         : base (MemberKind.Event, declaringType, definition, modifiers)
1276                 {
1277                         this.AccessorAdd = add;
1278                         this.AccessorRemove = remove;
1279                         this.MemberType = eventType;
1280                 }
1281
1282                 #region Properties
1283
1284                 public MethodSpec AccessorAdd {
1285                         get {
1286                                 return add;
1287                         }
1288                         set {
1289                                 add = value;
1290                         }
1291                 }
1292
1293                 public MethodSpec AccessorRemove {
1294                         get {
1295                                 return remove;
1296                         }
1297                         set {
1298                                 remove = value;
1299                         }
1300                 }
1301
1302                 public FieldSpec BackingField {
1303                         get {
1304                                 return backing_field;
1305                         }
1306                         set {
1307                                 backing_field = value;
1308                         }
1309                 }
1310
1311                 public TypeSpec MemberType { get; private set; }
1312
1313                 #endregion
1314
1315                 public override MemberSpec InflateMember (TypeParameterInflator inflator)
1316                 {
1317                         var es = (EventSpec) base.InflateMember (inflator);
1318                         es.MemberType = inflator.Inflate (MemberType);
1319                         return es;
1320                 }
1321         }
1322
1323         public class Indexer : PropertyBase, IParametersMember
1324         {
1325                 public class GetIndexerMethod : GetMethod, IParametersMember
1326                 {
1327                         ParametersCompiled parameters;
1328
1329                         public GetIndexerMethod (PropertyBase property, Modifiers modifiers, ParametersCompiled parameters, Attributes attrs, Location loc)
1330                                 : base (property, modifiers, attrs, loc)
1331                         {
1332                                 this.parameters = parameters;
1333                         }
1334
1335                         public override MethodBuilder Define (DeclSpace parent)
1336                         {
1337                                 parameters.Resolve (this);
1338                                 return base.Define (parent);
1339                         }
1340
1341                         public override ParametersCompiled ParameterInfo {
1342                                 get {
1343                                         return parameters;
1344                                 }
1345                         }
1346
1347                         #region IParametersMember Members
1348
1349                         AParametersCollection IParametersMember.Parameters {
1350                                 get {
1351                                         return parameters;
1352                                 }
1353                         }
1354
1355                         TypeSpec IInterfaceMemberSpec.MemberType {
1356                                 get {
1357                                         return ReturnType;
1358                                 }
1359                         }
1360
1361                         #endregion
1362                 }
1363
1364                 public class SetIndexerMethod : SetMethod, IParametersMember
1365                 {
1366                         public SetIndexerMethod (PropertyBase property, Modifiers modifiers, ParametersCompiled parameters, Attributes attrs, Location loc)
1367                                 : base (property, modifiers, parameters, attrs, loc)
1368                         {
1369                         }
1370
1371                         #region IParametersMember Members
1372
1373                         AParametersCollection IParametersMember.Parameters {
1374                                 get {
1375                                         return parameters;
1376                                 }
1377                         }
1378
1379                         TypeSpec IInterfaceMemberSpec.MemberType {
1380                                 get {
1381                                         return ReturnType;
1382                                 }
1383                         }
1384
1385                         #endregion
1386                 }
1387
1388                 const Modifiers AllowedModifiers =
1389                         Modifiers.NEW |
1390                         Modifiers.PUBLIC |
1391                         Modifiers.PROTECTED |
1392                         Modifiers.INTERNAL |
1393                         Modifiers.PRIVATE |
1394                         Modifiers.VIRTUAL |
1395                         Modifiers.SEALED |
1396                         Modifiers.OVERRIDE |
1397                         Modifiers.UNSAFE |
1398                         Modifiers.EXTERN |
1399                         Modifiers.ABSTRACT;
1400
1401                 const Modifiers AllowedInterfaceModifiers =
1402                         Modifiers.NEW;
1403
1404                 readonly ParametersCompiled parameters;
1405
1406                 public Indexer (DeclSpace parent, FullNamedExpression type, MemberName name, Modifiers mod,
1407                                 ParametersCompiled parameters, Attributes attrs)
1408                         : base (parent, type, mod,
1409                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedInterfaceModifiers : AllowedModifiers,
1410                                 name, attrs)
1411                 {
1412                         this.parameters = parameters;
1413                 }
1414
1415                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1416                 {
1417                         if (a.Type == pa.IndexerName) {
1418                                 if (IsExplicitImpl) {
1419                                         Report.Error (415, a.Location,
1420                                                 "The `{0}' attribute is valid only on an indexer that is not an explicit interface member declaration",
1421                                                 TypeManager.CSharpName (a.Type));
1422                                 }
1423
1424                                 // Attribute was copied to container
1425                                 return;
1426                         }
1427
1428                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
1429                 }
1430
1431                 protected override bool CheckForDuplications ()
1432                 {
1433                         return Parent.MemberCache.CheckExistingMembersOverloads (this, parameters);
1434                 }
1435
1436                 public override bool Define ()
1437                 {
1438                         if (!base.Define ())
1439                                 return false;
1440
1441                         if (!DefineParameters (parameters))
1442                                 return false;
1443
1444                         if (OptAttributes != null) {
1445                                 Attribute indexer_attr = OptAttributes.Search (PredefinedAttributes.Get.IndexerName);
1446                                 if (indexer_attr != null) {
1447                                         var compiling = indexer_attr.Type.MemberDefinition as TypeContainer;
1448                                         if (compiling != null)
1449                                                 compiling.Define ();
1450
1451                                         string name = indexer_attr.GetIndexerAttributeValue ();
1452                                         if ((ModFlags & Modifiers.OVERRIDE) != 0) {
1453                                                 Report.Error (609, indexer_attr.Location,
1454                                                         "Cannot set the `IndexerName' attribute on an indexer marked override");
1455                                         }
1456
1457                                         if (!string.IsNullOrEmpty (name))
1458                                                 ShortName = name;
1459                                 }
1460                         }
1461
1462                         if (InterfaceType != null) {
1463                                 string base_IndexerName = InterfaceType.MemberDefinition.GetAttributeDefaultMember ();
1464                                 if (base_IndexerName != Name)
1465                                         ShortName = base_IndexerName;
1466                         }
1467
1468                         if (!Parent.PartialContainer.AddMember (this))
1469                                 return false;
1470
1471                         flags |= MethodAttributes.HideBySig | MethodAttributes.SpecialName;
1472
1473                         if (!DefineAccessors ())
1474                                 return false;
1475
1476                         if (!CheckBase ())
1477                                 return false;
1478
1479                         DefineBuilders (MemberKind.Indexer, parameters);
1480                         return true;
1481                 }
1482
1483                 public override bool EnableOverloadChecks (MemberCore overload)
1484                 {
1485                         if (overload is Indexer) {
1486                                 caching_flags |= Flags.MethodOverloadsExist;
1487                                 return true;
1488                         }
1489
1490                         return base.EnableOverloadChecks (overload);
1491                 }
1492
1493                 public override string GetDocCommentName (DeclSpace ds)
1494                 {
1495                         return DocUtil.GetMethodDocCommentName (this, parameters, ds);
1496                 }
1497
1498                 public override string GetSignatureForError ()
1499                 {
1500                         StringBuilder sb = new StringBuilder (Parent.GetSignatureForError ());
1501                         if (MemberName.Left != null) {
1502                                 sb.Append ('.');
1503                                 sb.Append (MemberName.Left.GetSignatureForError ());
1504                         }
1505
1506                         sb.Append (".this");
1507                         sb.Append (parameters.GetSignatureForError ().Replace ('(', '[').Replace (')', ']'));
1508                         return sb.ToString ();
1509                 }
1510
1511                 public AParametersCollection Parameters {
1512                         get {
1513                                 return parameters;
1514                         }
1515                 }
1516
1517                 public ParametersCompiled ParameterInfo {
1518                         get {
1519                                 return parameters;
1520                         }
1521                 }
1522
1523                 protected override bool VerifyClsCompliance ()
1524                 {
1525                         if (!base.VerifyClsCompliance ())
1526                                 return false;
1527
1528                         parameters.VerifyClsCompliance (this);
1529                         return true;
1530                 }
1531         }
1532
1533         public class IndexerSpec : PropertySpec, IParametersMember
1534         {
1535                 AParametersCollection parameters;
1536
1537                 public IndexerSpec (TypeSpec declaringType, IMemberDefinition definition, TypeSpec memberType, AParametersCollection parameters, PropertyInfo info, Modifiers modifiers)
1538                         : base (MemberKind.Indexer, declaringType, definition, memberType, info, modifiers)
1539                 {
1540                         this.parameters = parameters;
1541                 }
1542
1543                 #region Properties
1544                 public AParametersCollection Parameters {
1545                         get {
1546                                 return parameters;
1547                         }
1548                 }
1549                 #endregion
1550
1551                 public override string GetSignatureForError ()
1552                 {
1553                         return DeclaringType.GetSignatureForError () + ".this" + parameters.GetSignatureForError ("[", "]", parameters.Count);
1554                 }
1555
1556                 public override MemberSpec InflateMember (TypeParameterInflator inflator)
1557                 {
1558                         var spec = (IndexerSpec) base.InflateMember (inflator);
1559                         spec.parameters = parameters.Inflate (inflator);
1560                         return spec;
1561                 }
1562         }
1563 }