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 // Copyright 2011 Xamarin Inc
  13 //
  14
  15 using System;
  16 using System.Collections.Generic;
  17 using System.Text;
  18 using Mono.CompilerServices.SymbolWriter;
  19
  20 #if NET_2_1
  21 using XmlElement = System.Object;
  22 #endif
  23
  24 #if STATIC
  25 using IKVM.Reflection;
  26 using IKVM.Reflection.Emit;
  27 #else
  28 using System.Reflection;
  29 using System.Reflection.Emit;
  30 #endif
  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                 protected PropertyBasedMember (TypeDefinition parent, FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, MemberName name, Attributes attrs)
  39                         : base (parent, type, mod, allowed_mod, name, attrs)
  40                 {
  41                 }
  42
  43                 protected void CheckReservedNameConflict (string prefix, MethodSpec accessor)
  44                 {
  45                         string name;
  46                         AParametersCollection parameters;
  47                         if (accessor != null) {
  48                                 name = accessor.Name;
  49                                 parameters = accessor.Parameters;
  50                         } else {
  51                                 name = prefix + ShortName;
  52                                 if (IsExplicitImpl)
  53                                         name = MemberName.Left + "." + name;
  54
  55                                 if (this is Indexer) {
  56                                         parameters = ((Indexer) this).ParameterInfo;
  57                                         if (prefix[0] == 's') {
  58                                                 var data = new IParameterData[parameters.Count + 1];
  59                                                 Array.Copy (parameters.FixedParameters, data, data.Length - 1);
  60                                                 data[data.Length - 1] = new ParameterData ("value", Parameter.Modifier.NONE);
  61                                                 var types = new TypeSpec[data.Length];
  62                                                 Array.Copy (parameters.Types, types, data.Length - 1);
  63                                                 types[data.Length - 1] = member_type;
  64
  65                                                 parameters = new ParametersImported (data, types, false);
  66                                         }
  67                                 } else {
  68                                         if (prefix[0] == 's')
  69                                                 parameters = ParametersCompiled.CreateFullyResolved (new[] { member_type });
  70                                         else
  71                                                 parameters = ParametersCompiled.EmptyReadOnlyParameters;
  72                                 }
  73                         }
  74
  75                         var conflict = MemberCache.FindMember (Parent.Definition,
  76                                 new MemberFilter (name, 0, MemberKind.Method, parameters, null),
  77                                 BindingRestriction.DeclaredOnly | BindingRestriction.NoAccessors);
  78
  79                         if (conflict != null) {
  80                                 Report.SymbolRelatedToPreviousError (conflict);
  81                                 Report.Error (82, Location, "A member `{0}' is already reserved", conflict.GetSignatureForError ());
  82                         }
  83                 }
  84
  85                 public abstract void PrepareEmit ();
  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 HasDifferentAccessibility {
 137                         get {
 138                                 return HasGet && HasSet &&
 139                                         (Get.Modifiers & Modifiers.AccessibilityMask) != (Set.Modifiers & Modifiers.AccessibilityMask);
 140                         }
 141                 }
 142
 143                 public bool HasGet {
 144                         get {
 145                                 return Get != null;
 146                         }
 147                 }
 148
 149                 public bool HasSet {
 150                         get {
 151                                 return Set != null;
 152                         }
 153                 }
 154
 155                 public PropertyInfo MetaInfo {
 156                         get {
 157                                 if ((state & StateFlags.PendingMetaInflate) != 0)
 158                                         throw new NotSupportedException ();
 159
 160                                 return info;
 161                         }
 162                 }
 163
 164                 public TypeSpec MemberType {
 165                         get {
 166                                 return memberType;
 167                         }
 168                 }
 169
 170                 #endregion
 171
 172                 public override MemberSpec InflateMember (TypeParameterInflator inflator)
 173                 {
 174                         var ps = (PropertySpec) base.InflateMember (inflator);
 175                         ps.memberType = inflator.Inflate (memberType);
 176                         return ps;
 177                 }
 178
 179                 public override List<MissingTypeSpecReference> ResolveMissingDependencies (MemberSpec caller)
 180                 {
 181                         return memberType.ResolveMissingDependencies (this);
 182                 }
 183         }
 184
 185         //
 186         // Properties and Indexers both generate PropertyBuilders, we use this to share
 187         // their common bits.
 188         //
 189         abstract public class PropertyBase : PropertyBasedMember {
 190
 191                 public class GetMethod : PropertyMethod
 192                 {
 193                         static readonly string[] attribute_targets = new string [] { "method", "return" };
 194
 195                         internal const string Prefix = "get_";
 196
 197                         public GetMethod (PropertyBase method, Modifiers modifiers, Attributes attrs, Location loc)
 198                                 : base (method, Prefix, modifiers, attrs, loc)
 199                         {
 200                         }
 201
 202                         public override void Define (TypeContainer parent)
 203                         {
 204                                 base.Define (parent);
 205
 206                                 Spec = new MethodSpec (MemberKind.Method, parent.PartialContainer.Definition, this, ReturnType, ParameterInfo, ModFlags);
 207
 208                                 method_data = new MethodData (method, ModFlags, flags, this);
 209
 210                                 method_data.Define (parent.PartialContainer, method.GetFullName (MemberName));
 211                         }
 212
 213                         public override TypeSpec ReturnType {
 214                                 get {
 215                                         return method.MemberType;
 216                                 }
 217                         }
 218
 219                         public override ParametersCompiled ParameterInfo {
 220                                 get {
 221                                         return ParametersCompiled.EmptyReadOnlyParameters;
 222                                 }
 223                         }
 224
 225                         public override string[] ValidAttributeTargets {
 226                                 get {
 227                                         return attribute_targets;
 228                                 }
 229                         }
 230                 }
 231
 232                 public class SetMethod : PropertyMethod {
 233
 234                         static readonly string[] attribute_targets = new string[] { "method", "param", "return" };
 235
 236                         internal const string Prefix = "set_";
 237
 238                         protected ParametersCompiled parameters;
 239
 240                         public SetMethod (PropertyBase method, Modifiers modifiers, ParametersCompiled parameters, Attributes attrs, Location loc)
 241                                 : base (method, Prefix, modifiers, attrs, loc)
 242                         {
 243                                 this.parameters = parameters;
 244                         }
 245
 246                         protected override void ApplyToExtraTarget (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 247                         {
 248                                 if (a.Target == AttributeTargets.Parameter) {
 249                                         parameters[0].ApplyAttributeBuilder (a, ctor, cdata, pa);
 250                                         return;
 251                                 }
 252
 253                                 base.ApplyToExtraTarget (a, ctor, cdata, pa);
 254                         }
 255
 256                         public override ParametersCompiled ParameterInfo {
 257                             get {
 258                                 return parameters;
 259                             }
 260                         }
 261
 262                         public override void Define (TypeContainer parent)
 263                         {
 264                                 parameters.Resolve (this);
 265
 266                                 base.Define (parent);
 267
 268                                 Spec = new MethodSpec (MemberKind.Method, parent.PartialContainer.Definition, this, ReturnType, ParameterInfo, ModFlags);
 269
 270                                 method_data = new MethodData (method, ModFlags, flags, this);
 271
 272                                 method_data.Define (parent.PartialContainer, method.GetFullName (MemberName));
 273                         }
 274
 275                         public override TypeSpec ReturnType {
 276                                 get {
 277                                         return Parent.Compiler.BuiltinTypes.Void;
 278                                 }
 279                         }
 280
 281                         public override string[] ValidAttributeTargets {
 282                                 get {
 283                                         return attribute_targets;
 284                                 }
 285                         }
 286                 }
 287
 288                 static readonly string[] attribute_targets = new string[] { "property" };
 289
 290                 public abstract class PropertyMethod : AbstractPropertyEventMethod
 291                 {
 292                         const Modifiers AllowedModifiers =
 293                                 Modifiers.PUBLIC |
 294                                 Modifiers.PROTECTED |
 295                                 Modifiers.INTERNAL |
 296                                 Modifiers.PRIVATE;
 297
 298                         protected readonly PropertyBase method;
 299                         protected MethodAttributes flags;
 300
 301                         public PropertyMethod (PropertyBase method, string prefix, Modifiers modifiers, Attributes attrs, Location loc)
 302                                 : base (method, prefix, attrs, loc)
 303                         {
 304                                 this.method = method;
 305                                 this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, modifiers, 0, loc, Report);
 306                                 this.ModFlags |= (method.ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE));
 307                         }
 308
 309                         public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 310                         {
 311                                 if (a.Type == pa.MethodImpl) {
 312                                         method.is_external_implementation = a.IsInternalCall ();
 313                                 }
 314
 315                                 base.ApplyAttributeBuilder (a, ctor, cdata, pa);
 316                         }
 317
 318                         public override AttributeTargets AttributeTargets {
 319                                 get {
 320                                         return AttributeTargets.Method;
 321                                 }
 322                         }
 323
 324                         public override bool IsClsComplianceRequired ()
 325                         {
 326                                 return method.IsClsComplianceRequired ();
 327                         }
 328
 329                         public virtual void Define (TypeContainer parent)
 330                         {
 331                                 var container = parent.PartialContainer;
 332
 333                                 //
 334                                 // Check for custom access modifier
 335                                 //
 336                                 if ((ModFlags & Modifiers.AccessibilityMask) == 0) {
 337                                         ModFlags |= method.ModFlags;
 338                                         flags = method.flags;
 339                                 } else {
 340                                         if (container.Kind == MemberKind.Interface)
 341                                                 Report.Error (275, Location, "`{0}': accessibility modifiers may not be used on accessors in an interface",
 342                                                         GetSignatureForError ());
 343                                         else if ((method.ModFlags & Modifiers.ABSTRACT) != 0 && (ModFlags & Modifiers.PRIVATE) != 0) {
 344                                                 Report.Error (442, Location, "`{0}': abstract properties cannot have private accessors", GetSignatureForError ());
 345                                         }
 346
 347                                         CheckModifiers (ModFlags);
 348                                         ModFlags |= (method.ModFlags & (~Modifiers.AccessibilityMask));
 349                                         ModFlags |= Modifiers.PROPERTY_CUSTOM;
 350                                         flags = ModifiersExtensions.MethodAttr (ModFlags);
 351                                         flags |= (method.flags & (~MethodAttributes.MemberAccessMask));
 352                                 }
 353
 354                                 CheckAbstractAndExtern (block != null);
 355                                 CheckProtectedModifier ();
 356
 357                                 if (block != null) {
 358                                         if (block.IsIterator)
 359                                                 Iterator.CreateIterator (this, Parent.PartialContainer, ModFlags);
 360
 361                                         if (Compiler.Settings.WriteMetadataOnly)
 362                                                 block = null;
 363                                 }
 364                         }
 365
 366                         public bool HasCustomAccessModifier {
 367                                 get {
 368                                         return (ModFlags & Modifiers.PROPERTY_CUSTOM) != 0;
 369                                 }
 370                         }
 371
 372                         public PropertyBase Property {
 373                                 get {
 374                                         return method;
 375                                 }
 376                         }
 377
 378                         public override ObsoleteAttribute GetAttributeObsolete ()
 379                         {
 380                                 return method.GetAttributeObsolete ();
 381                         }
 382
 383                         public override string GetSignatureForError()
 384                         {
 385                                 return method.GetSignatureForError () + "." + prefix.Substring (0, 3);
 386                         }
 387
 388                         void CheckModifiers (Modifiers modflags)
 389                         {
 390                                 if (!ModifiersExtensions.IsRestrictedModifier (modflags & Modifiers.AccessibilityMask, method.ModFlags & Modifiers.AccessibilityMask)) {
 391                                         Report.Error (273, Location,
 392                                                 "The accessibility modifier of the `{0}' accessor must be more restrictive than the modifier of the property or indexer `{1}'",
 393                                                 GetSignatureForError (), method.GetSignatureForError ());
 394                                 }
 395                         }
 396                 }
 397
 398                 PropertyMethod get, set, first;
 399                 PropertyBuilder PropertyBuilder;
 400
 401                 protected PropertyBase (TypeDefinition parent, FullNamedExpression type, Modifiers mod_flags, Modifiers allowed_mod, MemberName name, Attributes attrs)
 402                         : base (parent, type, mod_flags, allowed_mod, name, attrs)
 403                 {
 404                 }
 405
 406                 #region Properties
 407
 408                 public override AttributeTargets AttributeTargets {
 409                         get {
 410                                 return AttributeTargets.Property;
 411                         }
 412                 }
 413
 414                 public PropertyMethod AccessorFirst {
 415                         get {
 416                                 return first;
 417                         }
 418                 }
 419
 420                 public PropertyMethod AccessorSecond {
 421                         get {
 422                                 return first == get ? set : get;
 423                         }
 424                 }
 425
 426                 public override Variance ExpectedMemberTypeVariance {
 427                         get {
 428                                 return (get != null && set != null) ?
 429                                         Variance.None : set == null ?
 430                                         Variance.Covariant :
 431                                         Variance.Contravariant;
 432                         }
 433                 }
 434
 435                 public PropertyMethod Get {
 436                         get {
 437                                 return get;
 438                         }
 439                         set {
 440                                 get = value;
 441                                 if (first == null)
 442                                         first = value;
 443
 444                                 Parent.AddNameToContainer (get, get.MemberName.Basename);
 445                         }
 446                 }
 447
 448                 public PropertyMethod Set {
 449                         get {
 450                                 return set;
 451                         }
 452                         set {
 453                                 set = value;
 454                                 if (first == null)
 455                                         first = value;
 456
 457                                 Parent.AddNameToContainer (set, set.MemberName.Basename);
 458                         }
 459                 }
 460
 461                 public override string[] ValidAttributeTargets {
 462                         get {
 463                                 return attribute_targets;
 464                         }
 465                 }
 466
 467                 #endregion
 468
 469                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 470                 {
 471                         if (a.HasSecurityAttribute) {
 472                                 a.Error_InvalidSecurityParent ();
 473                                 return;
 474                         }
 475
 476                         if (a.Type == pa.Dynamic) {
 477                                 a.Error_MisusedDynamicAttribute ();
 478                                 return;
 479                         }
 480
 481                         PropertyBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
 482                 }
 483
 484                 void CheckMissingAccessor (MemberKind kind, ParametersCompiled parameters, bool get)
 485                 {
 486                         if (IsExplicitImpl) {
 487                                 MemberFilter filter;
 488                                 if (kind == MemberKind.Indexer)
 489                                         filter = new MemberFilter (MemberCache.IndexerNameAlias, 0, kind, parameters, null);
 490                                 else
 491                                         filter = new MemberFilter (MemberName.Name, 0, kind, null, null);
 492
 493                                 var implementing = MemberCache.FindMember (InterfaceType, filter, BindingRestriction.DeclaredOnly) as PropertySpec;
 494
 495                                 if (implementing == null)
 496                                         return;
 497
 498                                 var accessor = get ? implementing.Get : implementing.Set;
 499                                 if (accessor != null) {
 500                                         Report.SymbolRelatedToPreviousError (accessor);
 501                                         Report.Error (551, Location, "Explicit interface implementation `{0}' is missing accessor `{1}'",
 502                                                 GetSignatureForError (), accessor.GetSignatureForError ());
 503                                 }
 504                         }
 505                 }
 506
 507                 protected override bool CheckOverrideAgainstBase (MemberSpec base_member)
 508                 {
 509                         var ok = base.CheckOverrideAgainstBase (base_member);
 510
 511                         //
 512                         // Check base property accessors conflict
 513                         //
 514                         var base_prop = (PropertySpec) base_member;
 515                         if (Get != null) {
 516                                 if (!base_prop.HasGet) {
 517                                         if (ok) {
 518                                                 Report.SymbolRelatedToPreviousError (base_prop);
 519                                                 Report.Error (545, Get.Location,
 520                                                         "`{0}': cannot override because `{1}' does not have an overridable get accessor",
 521                                                         Get.GetSignatureForError (), base_prop.GetSignatureForError ());
 522                                                 ok = false;
 523                                         }
 524                                 } else if (Get.HasCustomAccessModifier || base_prop.HasDifferentAccessibility) {
 525                                         if (!CheckAccessModifiers (Get, base_prop.Get)) {
 526                                                 Error_CannotChangeAccessModifiers (Get, base_prop.Get);
 527                                                 ok = false;
 528                                         }
 529                                 }
 530                         }
 531
 532                         if (Set != null) {
 533                                 if (!base_prop.HasSet) {
 534                                         if (ok) {
 535                                                 Report.SymbolRelatedToPreviousError (base_prop);
 536                                                 Report.Error (546, Set.Location,
 537                                                         "`{0}': cannot override because `{1}' does not have an overridable set accessor",
 538                                                         Set.GetSignatureForError (), base_prop.GetSignatureForError ());
 539                                                 ok = false;
 540                                         }
 541                                 } else if (Set.HasCustomAccessModifier || base_prop.HasDifferentAccessibility) {
 542                                         if (!CheckAccessModifiers (Set, base_prop.Set)) {
 543                                                 Error_CannotChangeAccessModifiers (Set, base_prop.Set);
 544                                                 ok = false;
 545                                         }
 546                                 }
 547                         }
 548
 549                         if ((Set == null || !Set.HasCustomAccessModifier) && (Get == null || !Get.HasCustomAccessModifier)) {
 550                                 if (!CheckAccessModifiers (this, base_prop)) {
 551                                         Error_CannotChangeAccessModifiers (this, base_prop);
 552                                         ok = false;
 553                                 }
 554                         }
 555
 556                         return ok;
 557                 }
 558
 559                 protected override void DoMemberTypeDependentChecks ()
 560                 {
 561                         base.DoMemberTypeDependentChecks ();
 562
 563                         IsTypePermitted ();
 564
 565                         if (MemberType.IsStatic)
 566                                 Error_StaticReturnType ();
 567                 }
 568
 569                 protected override void DoMemberTypeIndependentChecks ()
 570                 {
 571                         base.DoMemberTypeIndependentChecks ();
 572
 573                         //
 574                         // Accessors modifiers check
 575                         //
 576                         if (AccessorSecond != null) {
 577                                 if ((Get.ModFlags & Modifiers.AccessibilityMask) != 0 && (Set.ModFlags & Modifiers.AccessibilityMask) != 0) {
 578                                         Report.Error (274, Location, "`{0}': Cannot specify accessibility modifiers for both accessors of the property or indexer",
 579                                                 GetSignatureForError ());
 580                                 }
 581                         } else if ((ModFlags & Modifiers.OVERRIDE) == 0 &&
 582                                 (Get == null && (Set.ModFlags & Modifiers.AccessibilityMask) != 0) ||
 583                                 (Set == null && (Get.ModFlags & Modifiers.AccessibilityMask) != 0)) {
 584                                 Report.Error (276, Location,
 585                                               "`{0}': accessibility modifiers on accessors may only be used if the property or indexer has both a get and a set accessor",
 586                                               GetSignatureForError ());
 587                         }
 588                 }
 589
 590                 protected bool DefineAccessors ()
 591                 {
 592                         first.Define (Parent);
 593                         if (AccessorSecond != null)
 594                                 AccessorSecond.Define (Parent);
 595
 596                         return true;
 597                 }
 598
 599                 protected void DefineBuilders (MemberKind kind, ParametersCompiled parameters)
 600                 {
 601                         PropertyBuilder = Parent.TypeBuilder.DefineProperty (
 602                                 GetFullName (MemberName), PropertyAttributes.None,
 603 #if !BOOTSTRAP_BASIC    // Requires trunk version mscorlib
 604                                 IsStatic ? 0 : CallingConventions.HasThis,
 605 #endif
 606                                 MemberType.GetMetaInfo (), null, null,
 607                                 parameters.GetMetaInfo (), null, null);
 608
 609                         PropertySpec spec;
 610                         if (kind == MemberKind.Indexer)
 611                                 spec = new IndexerSpec (Parent.Definition, this, MemberType, parameters, PropertyBuilder, ModFlags);
 612                         else
 613                                 spec = new PropertySpec (kind, Parent.Definition, this, MemberType, PropertyBuilder, ModFlags);
 614
 615                         if (Get != null) {
 616                                 spec.Get = Get.Spec;
 617                                 Parent.MemberCache.AddMember (this, Get.Spec.Name, Get.Spec);
 618                         } else {
 619                                 CheckMissingAccessor (kind, parameters, true);
 620                         }
 621
 622                         if (Set != null) {
 623                                 spec.Set = Set.Spec;
 624                                 Parent.MemberCache.AddMember (this, Set.Spec.Name, Set.Spec);
 625                         } else {
 626                                 CheckMissingAccessor (kind, parameters, false);
 627                         }
 628
 629                         Parent.MemberCache.AddMember (this, PropertyBuilder.Name, spec);
 630                 }
 631
 632                 public override void Emit ()
 633                 {
 634                         CheckReservedNameConflict (GetMethod.Prefix, get == null ? null : get.Spec);
 635                         CheckReservedNameConflict (SetMethod.Prefix, set == null ? null : set.Spec);
 636
 637                         if (OptAttributes != null)
 638                                 OptAttributes.Emit ();
 639
 640                         if (member_type.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
 641                                 Module.PredefinedAttributes.Dynamic.EmitAttribute (PropertyBuilder);
 642                         } else if (member_type.HasDynamicElement) {
 643                                 Module.PredefinedAttributes.Dynamic.EmitAttribute (PropertyBuilder, member_type, Location);
 644                         }
 645
 646                         ConstraintChecker.Check (this, member_type, type_expr.Location);
 647
 648                         first.Emit (Parent);
 649                         if (AccessorSecond != null)
 650                                 AccessorSecond.Emit (Parent);
 651
 652                         base.Emit ();
 653                 }
 654
 655                 public override bool IsUsed {
 656                         get {
 657                                 if (IsExplicitImpl)
 658                                         return true;
 659
 660                                 return Get.IsUsed | Set.IsUsed;
 661                         }
 662                 }
 663
 664                 public override void PrepareEmit ()
 665                 {
 666                         AccessorFirst.PrepareEmit ();
 667                         if (AccessorSecond != null)
 668                                 AccessorSecond.PrepareEmit ();
 669
 670                         if (get != null) {
 671                                 var method = Get.Spec.GetMetaInfo () as MethodBuilder;
 672                                 if (method != null)
 673                                         PropertyBuilder.SetGetMethod (method);
 674                         }
 675
 676                         if (set != null) {
 677                                 var method = Set.Spec.GetMetaInfo () as MethodBuilder;
 678                                 if (method != null)
 679                                         PropertyBuilder.SetSetMethod (method);
 680                         }
 681                 }
 682
 683                 protected override void SetMemberName (MemberName new_name)
 684                 {
 685                         base.SetMemberName (new_name);
 686
 687                         if (Get != null)
 688                                 Get.UpdateName (this);
 689
 690                         if (Set != null)
 691                                 Set.UpdateName (this);
 692                 }
 693
 694                 public override void WriteDebugSymbol (MonoSymbolFile file)
 695                 {
 696                         if (get != null)
 697                                 get.WriteDebugSymbol (file);
 698
 699                         if (set != null)
 700                                 set.WriteDebugSymbol (file);
 701                 }
 702
 703                 //
 704                 //   Represents header string for documentation comment.
 705                 //
 706                 public override string DocCommentHeader {
 707                         get { return "P:"; }
 708                 }
 709         }
 710
 711         public class Property : PropertyBase
 712         {
 713                 public sealed class BackingField : Field
 714                 {
 715                         readonly Property property;
 716
 717                         public BackingField (Property p)
 718                                 : base (p.Parent, p.type_expr,
 719                                 Modifiers.BACKING_FIELD | Modifiers.COMPILER_GENERATED | Modifiers.PRIVATE | (p.ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE)),
 720                                 new MemberName ("<" + p.GetFullName (p.MemberName) + ">k__BackingField", p.Location), null)
 721                         {
 722                                 this.property = p;
 723                         }
 724
 725                         public Property OriginalProperty {
 726                                 get {
 727                                         return property;
 728                                 }
 729                         }
 730
 731                         public override string GetSignatureForError ()
 732                         {
 733                                 return property.GetSignatureForError ();
 734                         }
 735                 }
 736
 737                 static readonly string[] attribute_target_auto = new string[] { "property", "field" };
 738
 739                 Field backing_field;
 740
 741                 public Property (TypeDefinition parent, FullNamedExpression type, Modifiers mod,
 742                                  MemberName name, Attributes attrs)
 743                         : base (parent, type, mod,
 744                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedModifiersInterface :
 745                                 parent.PartialContainer.Kind == MemberKind.Struct ? AllowedModifiersStruct :
 746                                 AllowedModifiersClass,
 747                                 name, attrs)
 748                 {
 749                 }
 750
 751                 public override void Accept (StructuralVisitor visitor)
 752                 {
 753                         visitor.Visit (this);
 754                 }
 755
 756                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 757                 {
 758                         if (a.Target == AttributeTargets.Field) {
 759                                 backing_field.ApplyAttributeBuilder (a, ctor, cdata, pa);
 760                                 return;
 761                         }
 762
 763                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
 764                 }
 765
 766                 void CreateAutomaticProperty ()
 767                 {
 768                         // Create backing field
 769                         backing_field = new BackingField (this);
 770                         if (!backing_field.Define ())
 771                                 return;
 772
 773                         Parent.PartialContainer.Members.Add (backing_field);
 774
 775                         FieldExpr fe = new FieldExpr (backing_field, Location);
 776                         if ((backing_field.ModFlags & Modifiers.STATIC) == 0)
 777                                 fe.InstanceExpression = new CompilerGeneratedThis (Parent.CurrentType, Location);
 778
 779                         //
 780                         // Create get block but we careful with location to
 781                         // emit only single sequence point per accessor. This allow
 782                         // to set a breakpoint on it even with no user code
 783                         //
 784                         Get.Block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location.Null);
 785                         Return r = new Return (fe, Get.Location);
 786                         Get.Block.AddStatement (r);
 787
 788                         // Create set block
 789                         Set.Block = new ToplevelBlock (Compiler, Set.ParameterInfo, Location.Null);
 790                         Assign a = new SimpleAssign (fe, new SimpleName ("value", Location.Null), Location.Null);
 791                         Set.Block.AddStatement (new StatementExpression (a, Set.Location));
 792                 }
 793
 794                 public override bool Define ()
 795                 {
 796                         if (!base.Define ())
 797                                 return false;
 798
 799                         flags |= MethodAttributes.HideBySig | MethodAttributes.SpecialName;
 800
 801                         if (!IsInterface && (ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN)) == 0 &&
 802                                 AccessorSecond != null && Get.Block == null && Set.Block == null) {
 803                                 if (Compiler.Settings.Version <= LanguageVersion.ISO_2)
 804                                         Report.FeatureIsNotAvailable (Compiler, Location, "automatically implemented properties");
 805
 806                                 Get.ModFlags |= Modifiers.COMPILER_GENERATED;
 807                                 Set.ModFlags |= Modifiers.COMPILER_GENERATED;
 808                                 CreateAutomaticProperty ();
 809                         }
 810
 811                         if (!DefineAccessors ())
 812                                 return false;
 813
 814                         if (AccessorSecond == null) {
 815                                 PropertyMethod pm;
 816                                 if (AccessorFirst is GetMethod)
 817                                         pm = new SetMethod (this, 0, ParametersCompiled.EmptyReadOnlyParameters, null, Location);
 818                                 else
 819                                         pm = new GetMethod (this, 0, null, Location);
 820
 821                                 Parent.AddNameToContainer (pm, pm.MemberName.Basename);
 822                         }
 823
 824                         if (!CheckBase ())
 825                                 return false;
 826
 827                         DefineBuilders (MemberKind.Property, ParametersCompiled.EmptyReadOnlyParameters);
 828                         return true;
 829                 }
 830
 831                 public override void Emit ()
 832                 {
 833                         if ((AccessorFirst.ModFlags & (Modifiers.STATIC | Modifiers.COMPILER_GENERATED)) == Modifiers.COMPILER_GENERATED && Parent.PartialContainer.HasExplicitLayout) {
 834                                 Report.Error (842, Location,
 835                                         "Automatically implemented property `{0}' cannot be used inside a type with an explicit StructLayout attribute",
 836                                         GetSignatureForError ());
 837                         }
 838
 839                         base.Emit ();
 840                 }
 841
 842                 public override string[] ValidAttributeTargets {
 843                         get {
 844                                 return Get != null && ((Get.ModFlags & Modifiers.COMPILER_GENERATED) != 0) ?
 845                                         attribute_target_auto : base.ValidAttributeTargets;
 846                         }
 847                 }
 848         }
 849
 850         /// <summary>
 851         /// For case when event is declared like property (with add and remove accessors).
 852         /// </summary>
 853         public class EventProperty: Event {
 854                 public abstract class AEventPropertyAccessor : AEventAccessor
 855                 {
 856                         protected AEventPropertyAccessor (EventProperty method, string prefix, Attributes attrs, Location loc)
 857                                 : base (method, prefix, attrs, loc)
 858                         {
 859                         }
 860
 861                         public override void Define (TypeContainer ds)
 862                         {
 863                                 CheckAbstractAndExtern (block != null);
 864                                 base.Define (ds);
 865                         }
 866
 867                         public override string GetSignatureForError ()
 868                         {
 869                                 return method.GetSignatureForError () + "." + prefix.Substring (0, prefix.Length - 1);
 870                         }
 871                 }
 872
 873                 public sealed class AddDelegateMethod: AEventPropertyAccessor
 874                 {
 875                         public AddDelegateMethod (EventProperty method, Attributes attrs, Location loc)
 876                                 : base (method, AddPrefix, attrs, loc)
 877                         {
 878                         }
 879                 }
 880
 881                 public sealed class RemoveDelegateMethod: AEventPropertyAccessor
 882                 {
 883                         public RemoveDelegateMethod (EventProperty method, Attributes attrs, Location loc)
 884                                 : base (method, RemovePrefix, attrs, loc)
 885                         {
 886                         }
 887                 }
 888
 889                 static readonly string[] attribute_targets = new string [] { "event" };
 890
 891                 public EventProperty (TypeDefinition parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
 892                         : base (parent, type, mod_flags, name, attrs)
 893                 {
 894                 }
 895
 896                 public override void Accept (StructuralVisitor visitor)
 897                 {
 898                         visitor.Visit (this);
 899                 }
 900
 901                 public override bool Define()
 902                 {
 903                         if (!base.Define ())
 904                                 return false;
 905
 906                         SetIsUsed ();
 907                         return true;
 908                 }
 909
 910                 public override string[] ValidAttributeTargets {
 911                         get {
 912                                 return attribute_targets;
 913                         }
 914                 }
 915         }
 916
 917         /// <summary>
 918         /// Event is declared like field.
 919         /// </summary>
 920         public class EventField : Event
 921         {
 922                 abstract class EventFieldAccessor : AEventAccessor
 923                 {
 924                         protected EventFieldAccessor (EventField method, string prefix)
 925                                 : base (method, prefix, null, method.Location)
 926                         {
 927                         }
 928
 929                         protected abstract MethodSpec GetOperation (Location loc);
 930
 931                         public override void Emit (TypeDefinition parent)
 932                         {
 933                                 if ((method.ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN)) == 0 && !Compiler.Settings.WriteMetadataOnly) {
 934                                         block = new ToplevelBlock (Compiler, ParameterInfo, Location) {
 935                                                 IsCompilerGenerated = true
 936                                         };
 937                                         FabricateBodyStatement ();
 938                                 }
 939
 940                                 base.Emit (parent);
 941                         }
 942
 943                         void FabricateBodyStatement ()
 944                         {
 945                                 //
 946                                 // Delegate obj1 = backing_field
 947                                 // do {
 948                                 //   Delegate obj2 = obj1;
 949                                 //   obj1 = Interlocked.CompareExchange (ref backing_field, Delegate.Combine|Remove(obj2, value), obj1);
 950                                 // } while ((object)obj1 != (object)obj2)
 951                                 //
 952
 953                                 var field_info = ((EventField) method).backing_field;
 954                                 FieldExpr f_expr = new FieldExpr (field_info, Location);
 955                                 if (!IsStatic)
 956                                         f_expr.InstanceExpression = new CompilerGeneratedThis (Parent.CurrentType, Location);
 957
 958                                 var obj1 = LocalVariable.CreateCompilerGenerated (field_info.MemberType, block, Location);
 959                                 var obj2 = LocalVariable.CreateCompilerGenerated (field_info.MemberType, block, Location);
 960
 961                                 block.AddStatement (new StatementExpression (new SimpleAssign (new LocalVariableReference (obj1, Location), f_expr)));
 962
 963                                 var cond = new BooleanExpression (new Binary (Binary.Operator.Inequality,
 964                                         new Cast (new TypeExpression (Module.Compiler.BuiltinTypes.Object, Location), new LocalVariableReference (obj1, Location), Location),
 965                                         new Cast (new TypeExpression (Module.Compiler.BuiltinTypes.Object, Location), new LocalVariableReference (obj2, Location), Location)));
 966
 967                                 var body = new ExplicitBlock (block, Location, Location);
 968                                 block.AddStatement (new Do (body, cond, Location, Location));
 969
 970                                 body.AddStatement (new StatementExpression (
 971                                         new SimpleAssign (new LocalVariableReference (obj2, Location), new LocalVariableReference (obj1, Location))));
 972
 973                                 var args_oper = new Arguments (2);
 974                                 args_oper.Add (new Argument (new LocalVariableReference (obj2, Location)));
 975                                 args_oper.Add (new Argument (block.GetParameterReference (0, Location)));
 976
 977                                 var op_method = GetOperation (Location);
 978
 979                                 var args = new Arguments (3);
 980                                 args.Add (new Argument (f_expr, Argument.AType.Ref));
 981                                 args.Add (new Argument (new Cast (
 982                                         new TypeExpression (field_info.MemberType, Location),
 983                                         new Invocation (MethodGroupExpr.CreatePredefined (op_method, op_method.DeclaringType, Location), args_oper),
 984                                         Location)));
 985                                 args.Add (new Argument (new LocalVariableReference (obj1, Location)));
 986
 987                                 var cas = Module.PredefinedMembers.InterlockedCompareExchange_T.Resolve (Location);
 988                                 if (cas == null)
 989                                         return;
 990
 991                                 body.AddStatement (new StatementExpression (new SimpleAssign (
 992                                         new LocalVariableReference (obj1, Location),
 993                                         new Invocation (MethodGroupExpr.CreatePredefined (cas, cas.DeclaringType, Location), args))));
 994                         }
 995                 }
 996
 997                 sealed class AddDelegateMethod: EventFieldAccessor
 998                 {
 999                         public AddDelegateMethod (EventField method):
1000                                 base (method, AddPrefix)
1001                         {
1002                         }
1003
1004                         protected override MethodSpec GetOperation (Location loc)
1005                         {
1006                                 return Module.PredefinedMembers.DelegateCombine.Resolve (loc);
1007                         }
1008                 }
1009
1010                 sealed class RemoveDelegateMethod: EventFieldAccessor
1011                 {
1012                         public RemoveDelegateMethod (EventField method):
1013                                 base (method, RemovePrefix)
1014                         {
1015                         }
1016
1017                         protected override MethodSpec GetOperation (Location loc)
1018                         {
1019                                 return Module.PredefinedMembers.DelegateRemove.Resolve (loc);
1020                         }
1021                 }
1022
1023
1024                 static readonly string[] attribute_targets = new string [] { "event", "field", "method" };
1025                 static readonly string[] attribute_targets_interface = new string[] { "event", "method" };
1026
1027                 Expression initializer;
1028                 Field backing_field;
1029                 List<FieldDeclarator> declarators;
1030
1031                 public EventField (TypeDefinition parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
1032                         : base (parent, type, mod_flags, name, attrs)
1033                 {
1034                         Add = new AddDelegateMethod (this);
1035                         Remove = new RemoveDelegateMethod (this);
1036                 }
1037
1038                 #region Properties
1039
1040                 public List<FieldDeclarator> Declarators {
1041                         get {
1042                                 return this.declarators;
1043                         }
1044                 }
1045
1046                 bool HasBackingField {
1047                         get {
1048                                 return !IsInterface && (ModFlags & Modifiers.ABSTRACT) == 0;
1049                         }
1050                 }
1051
1052                 public Expression Initializer {
1053                         get {
1054                                 return initializer;
1055                         }
1056                         set {
1057                                 initializer = value;
1058                         }
1059                 }
1060
1061                 public override string[] ValidAttributeTargets {
1062                         get {
1063                                 return HasBackingField ? attribute_targets : attribute_targets_interface;
1064                         }
1065                 }
1066
1067                 #endregion
1068
1069
1070                 public override void Accept (StructuralVisitor visitor)
1071                 {
1072                         visitor.Visit (this);
1073                 }
1074
1075                 public void AddDeclarator (FieldDeclarator declarator)
1076                 {
1077                         if (declarators == null)
1078                                 declarators = new List<FieldDeclarator> (2);
1079
1080                         declarators.Add (declarator);
1081
1082                         Parent.AddNameToContainer (this, declarator.Name.Value);
1083                 }
1084
1085                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1086                 {
1087                         if (a.Target == AttributeTargets.Field) {
1088                                 backing_field.ApplyAttributeBuilder (a, ctor, cdata, pa);
1089                                 return;
1090                         }
1091
1092                         if (a.Target == AttributeTargets.Method) {
1093                                 int errors = Report.Errors;
1094                                 Add.ApplyAttributeBuilder (a, ctor, cdata, pa);
1095                                 if (errors == Report.Errors)
1096                                         Remove.ApplyAttributeBuilder (a, ctor, cdata, pa);
1097                                 return;
1098                         }
1099
1100                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
1101                 }
1102
1103                 public override bool Define()
1104                 {
1105                         var mod_flags_src = ModFlags;
1106
1107                         if (!base.Define ())
1108                                 return false;
1109
1110                         if (declarators != null) {
1111                                 if ((mod_flags_src & Modifiers.DEFAULT_ACCESS_MODIFIER) != 0)
1112                                         mod_flags_src &= ~(Modifiers.AccessibilityMask | Modifiers.DEFAULT_ACCESS_MODIFIER);
1113
1114                                 var t = new TypeExpression (MemberType, TypeExpression.Location);
1115                                 foreach (var d in declarators) {
1116                                         var ef = new EventField (Parent, t, mod_flags_src, new MemberName (d.Name.Value, d.Name.Location), OptAttributes);
1117
1118                                         if (d.Initializer != null)
1119                                                 ef.initializer = d.Initializer;
1120
1121                                         ef.Define ();
1122                                         Parent.PartialContainer.Members.Add (ef);
1123                                 }
1124                         }
1125
1126                         if (!HasBackingField) {
1127                                 SetIsUsed ();
1128                                 return true;
1129                         }
1130
1131                         backing_field = new Field (Parent,
1132                                 new TypeExpression (MemberType, Location),
1133                                 Modifiers.BACKING_FIELD | Modifiers.COMPILER_GENERATED | Modifiers.PRIVATE | (ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE)),
1134                                 MemberName, null);
1135
1136                         Parent.PartialContainer.Members.Add (backing_field);
1137                         backing_field.Initializer = Initializer;
1138                         backing_field.ModFlags &= ~Modifiers.COMPILER_GENERATED;
1139
1140                         // Call define because we passed fields definition
1141                         backing_field.Define ();
1142
1143                         // Set backing field for event fields
1144                         spec.BackingField = backing_field.Spec;
1145
1146                         return true;
1147                 }
1148         }
1149
1150         public abstract class Event : PropertyBasedMember
1151         {
1152                 public abstract class AEventAccessor : AbstractPropertyEventMethod
1153                 {
1154                         protected readonly Event method;
1155                         readonly ParametersCompiled parameters;
1156
1157                         static readonly string[] attribute_targets = new string [] { "method", "param", "return" };
1158
1159                         public const string AddPrefix = "add_";
1160                         public const string RemovePrefix = "remove_";
1161
1162                         protected AEventAccessor (Event method, string prefix, Attributes attrs, Location loc)
1163                                 : base (method, prefix, attrs, loc)
1164                         {
1165                                 this.method = method;
1166                                 this.ModFlags = method.ModFlags;
1167                                 this.parameters = ParametersCompiled.CreateImplicitParameter (method.TypeExpression, loc);
1168                         }
1169
1170                         public bool IsInterfaceImplementation {
1171                                 get { return method_data.implementing != null; }
1172                         }
1173
1174                         public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1175                         {
1176                                 if (a.Type == pa.MethodImpl) {
1177                                         method.is_external_implementation = a.IsInternalCall ();
1178                                 }
1179
1180                                 base.ApplyAttributeBuilder (a, ctor, cdata, pa);
1181                         }
1182
1183                         protected override void ApplyToExtraTarget (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1184                         {
1185                                 if (a.Target == AttributeTargets.Parameter) {
1186                                         parameters[0].ApplyAttributeBuilder (a, ctor, cdata, pa);
1187                                         return;
1188                                 }
1189
1190                                 base.ApplyToExtraTarget (a, ctor, cdata, pa);
1191                         }
1192
1193                         public override AttributeTargets AttributeTargets {
1194                                 get {
1195                                         return AttributeTargets.Method;
1196                                 }
1197                         }
1198
1199                         public override bool IsClsComplianceRequired ()
1200                         {
1201                                 return method.IsClsComplianceRequired ();
1202                         }
1203
1204                         public virtual void Define (TypeContainer parent)
1205                         {
1206                                 // Fill in already resolved event type to speed things up and
1207                                 // avoid confusing duplicate errors
1208                                 ((Parameter) parameters.FixedParameters[0]).Type = method.member_type;
1209                                 parameters.Types = new TypeSpec[] { method.member_type };
1210
1211                                 method_data = new MethodData (method, method.ModFlags,
1212                                         method.flags | MethodAttributes.HideBySig | MethodAttributes.SpecialName, this);
1213
1214                                 if (!method_data.Define (parent.PartialContainer, method.GetFullName (MemberName)))
1215                                         return;
1216
1217                                 if (Compiler.Settings.WriteMetadataOnly)
1218                                         block = null;
1219
1220                                 Spec = new MethodSpec (MemberKind.Method, parent.PartialContainer.Definition, this, ReturnType, ParameterInfo, method.ModFlags);
1221                                 Spec.IsAccessor = true;
1222                         }
1223
1224                         public override TypeSpec ReturnType {
1225                                 get {
1226                                         return Parent.Compiler.BuiltinTypes.Void;
1227                                 }
1228                         }
1229
1230                         public override ObsoleteAttribute GetAttributeObsolete ()
1231                         {
1232                                 return method.GetAttributeObsolete ();
1233                         }
1234
1235                         public MethodData MethodData {
1236                                 get {
1237                                         return method_data;
1238                                 }
1239                         }
1240
1241                         public override string[] ValidAttributeTargets {
1242                                 get {
1243                                         return attribute_targets;
1244                                 }
1245                         }
1246
1247                         public override ParametersCompiled ParameterInfo {
1248                                 get {
1249                                         return parameters;
1250                                 }
1251                         }
1252                 }
1253
1254                 AEventAccessor add, remove;
1255                 EventBuilder EventBuilder;
1256                 protected EventSpec spec;
1257
1258                 protected Event (TypeDefinition parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
1259                         : base (parent, type, mod_flags,
1260                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedModifiersInterface :
1261                                 parent.PartialContainer.Kind == MemberKind.Struct ? AllowedModifiersStruct :
1262                                 AllowedModifiersClass,
1263                                 name, attrs)
1264                 {
1265                 }
1266
1267                 #region Properties
1268
1269                 public override AttributeTargets AttributeTargets {
1270                         get {
1271                                 return AttributeTargets.Event;
1272                         }
1273                 }
1274
1275                 public AEventAccessor Add {
1276                         get {
1277                                 return this.add;
1278                         }
1279                         set {
1280                                 add = value;
1281                                 Parent.AddNameToContainer (value, value.MemberName.Basename);
1282                         }
1283                 }
1284
1285                 public override Variance ExpectedMemberTypeVariance {
1286                         get {
1287                                 return Variance.Contravariant;
1288                         }
1289                 }
1290
1291                 public AEventAccessor Remove {
1292                         get {
1293                                 return this.remove;
1294                         }
1295                         set {
1296                                 remove = value;
1297                                 Parent.AddNameToContainer (value, value.MemberName.Basename);
1298                         }
1299                 }
1300                 #endregion
1301
1302                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1303                 {
1304                         if ((a.HasSecurityAttribute)) {
1305                                 a.Error_InvalidSecurityParent ();
1306                                 return;
1307                         }
1308
1309                         EventBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
1310                 }
1311
1312                 protected override bool CheckOverrideAgainstBase (MemberSpec base_member)
1313                 {
1314                         var ok = base.CheckOverrideAgainstBase (base_member);
1315
1316                         if (!CheckAccessModifiers (this, base_member)) {
1317                                 Error_CannotChangeAccessModifiers (this, base_member);
1318                                 ok = false;
1319                         }
1320
1321                         return ok;
1322                 }
1323
1324                 public override bool Define ()
1325                 {
1326                         if (!base.Define ())
1327                                 return false;
1328
1329                         if (!MemberType.IsDelegate) {
1330                                 Report.Error (66, Location, "`{0}': event must be of a delegate type", GetSignatureForError ());
1331                         }
1332
1333                         if (!CheckBase ())
1334                                 return false;
1335
1336                         //
1337                         // Now define the accessors
1338                         //
1339                         add.Define (Parent);
1340                         remove.Define (Parent);
1341
1342                         EventBuilder = Parent.TypeBuilder.DefineEvent (GetFullName (MemberName), EventAttributes.None, MemberType.GetMetaInfo ());
1343
1344                         spec = new EventSpec (Parent.Definition, this, MemberType, ModFlags, Add.Spec, remove.Spec);
1345
1346                         Parent.MemberCache.AddMember (this, GetFullName (MemberName), spec);
1347                         Parent.MemberCache.AddMember (this, Add.Spec.Name, Add.Spec);
1348                         Parent.MemberCache.AddMember (this, Remove.Spec.Name, remove.Spec);
1349
1350                         return true;
1351                 }
1352
1353                 public override void Emit ()
1354                 {
1355                         CheckReservedNameConflict (null, add.Spec);
1356                         CheckReservedNameConflict (null, remove.Spec);
1357
1358                         if (OptAttributes != null) {
1359                                 OptAttributes.Emit ();
1360                         }
1361
1362                         ConstraintChecker.Check (this, member_type, type_expr.Location);
1363
1364                         Add.Emit (Parent);
1365                         Remove.Emit (Parent);
1366
1367                         base.Emit ();
1368                 }
1369
1370                 public override void PrepareEmit ()
1371                 {
1372                         add.PrepareEmit ();
1373                         remove.PrepareEmit ();
1374
1375                         EventBuilder.SetAddOnMethod (add.MethodData.MethodBuilder);
1376                         EventBuilder.SetRemoveOnMethod (remove.MethodData.MethodBuilder);
1377                 }
1378
1379                 public override void WriteDebugSymbol (MonoSymbolFile file)
1380                 {
1381                         add.WriteDebugSymbol (file);
1382                         remove.WriteDebugSymbol (file);
1383                 }
1384
1385                 //
1386                 //   Represents header string for documentation comment.
1387                 //
1388                 public override string DocCommentHeader {
1389                         get { return "E:"; }
1390                 }
1391         }
1392
1393         public class EventSpec : MemberSpec, IInterfaceMemberSpec
1394         {
1395                 MethodSpec add, remove;
1396                 FieldSpec backing_field;
1397
1398                 public EventSpec (TypeSpec declaringType, IMemberDefinition definition, TypeSpec eventType, Modifiers modifiers, MethodSpec add, MethodSpec remove)
1399                         : base (MemberKind.Event, declaringType, definition, modifiers)
1400                 {
1401                         this.AccessorAdd = add;
1402                         this.AccessorRemove = remove;
1403                         this.MemberType = eventType;
1404                 }
1405
1406                 #region Properties
1407
1408                 public MethodSpec AccessorAdd {
1409                         get {
1410                                 return add;
1411                         }
1412                         set {
1413                                 add = value;
1414                         }
1415                 }
1416
1417                 public MethodSpec AccessorRemove {
1418                         get {
1419                                 return remove;
1420                         }
1421                         set {
1422                                 remove = value;
1423                         }
1424                 }
1425
1426                 public FieldSpec BackingField {
1427                         get {
1428                                 return backing_field;
1429                         }
1430                         set {
1431                                 backing_field = value;
1432                         }
1433                 }
1434
1435                 public TypeSpec MemberType { get; private set; }
1436
1437                 #endregion
1438
1439                 public override MemberSpec InflateMember (TypeParameterInflator inflator)
1440                 {
1441                         var es = (EventSpec) base.InflateMember (inflator);
1442                         es.MemberType = inflator.Inflate (MemberType);
1443
1444                         if (backing_field != null)
1445                                 es.backing_field = (FieldSpec) backing_field.InflateMember (inflator);
1446
1447                         return es;
1448                 }
1449
1450                 public override List<MissingTypeSpecReference> ResolveMissingDependencies (MemberSpec caller)
1451                 {
1452                         return MemberType.ResolveMissingDependencies (this);
1453                 }
1454         }
1455
1456         public class Indexer : PropertyBase, IParametersMember
1457         {
1458                 public class GetIndexerMethod : GetMethod, IParametersMember
1459                 {
1460                         ParametersCompiled parameters;
1461
1462                         public GetIndexerMethod (PropertyBase property, Modifiers modifiers, ParametersCompiled parameters, Attributes attrs, Location loc)
1463                                 : base (property, modifiers, attrs, loc)
1464                         {
1465                                 this.parameters = parameters;
1466                         }
1467
1468                         public override void Define (TypeContainer parent)
1469                         {
1470                                 // Disable reporting, parameters are resolved twice
1471                                 Report.DisableReporting ();
1472                                 try {
1473                                         parameters.Resolve (this);
1474                                 } finally {
1475                                         Report.EnableReporting ();
1476                                 }
1477
1478                                 base.Define (parent);
1479                         }
1480
1481                         public override ParametersCompiled ParameterInfo {
1482                                 get {
1483                                         return parameters;
1484                                 }
1485                         }
1486
1487                         #region IParametersMember Members
1488
1489                         AParametersCollection IParametersMember.Parameters {
1490                                 get {
1491                                         return parameters;
1492                                 }
1493                         }
1494
1495                         TypeSpec IInterfaceMemberSpec.MemberType {
1496                                 get {
1497                                         return ReturnType;
1498                                 }
1499                         }
1500
1501                         #endregion
1502                 }
1503
1504                 public class SetIndexerMethod : SetMethod, IParametersMember
1505                 {
1506                         public SetIndexerMethod (PropertyBase property, Modifiers modifiers, ParametersCompiled parameters, Attributes attrs, Location loc)
1507                                 : base (property, modifiers, parameters, attrs, loc)
1508                         {
1509                         }
1510
1511                         #region IParametersMember Members
1512
1513                         AParametersCollection IParametersMember.Parameters {
1514                                 get {
1515                                         return parameters;
1516                                 }
1517                         }
1518
1519                         TypeSpec IInterfaceMemberSpec.MemberType {
1520                                 get {
1521                                         return ReturnType;
1522                                 }
1523                         }
1524
1525                         #endregion
1526                 }
1527
1528                 const Modifiers AllowedModifiers =
1529                         Modifiers.NEW |
1530                         Modifiers.PUBLIC |
1531                         Modifiers.PROTECTED |
1532                         Modifiers.INTERNAL |
1533                         Modifiers.PRIVATE |
1534                         Modifiers.VIRTUAL |
1535                         Modifiers.SEALED |
1536                         Modifiers.OVERRIDE |
1537                         Modifiers.UNSAFE |
1538                         Modifiers.EXTERN |
1539                         Modifiers.ABSTRACT;
1540
1541                 const Modifiers AllowedInterfaceModifiers =
1542                         Modifiers.NEW;
1543
1544                 readonly ParametersCompiled parameters;
1545
1546                 public Indexer (TypeDefinition parent, FullNamedExpression type, MemberName name, Modifiers mod, ParametersCompiled parameters, Attributes attrs)
1547                         : base (parent, type, mod,
1548                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedInterfaceModifiers : AllowedModifiers,
1549                                 name, attrs)
1550                 {
1551                         this.parameters = parameters;
1552                 }
1553
1554                 #region Properties
1555
1556                 AParametersCollection IParametersMember.Parameters {
1557                         get {
1558                                 return parameters;
1559                         }
1560                 }
1561
1562                 public ParametersCompiled ParameterInfo {
1563                         get {
1564                                 return parameters;
1565                         }
1566                 }
1567
1568                 #endregion
1569
1570
1571                 public override void Accept (StructuralVisitor visitor)
1572                 {
1573                         visitor.Visit (this);
1574                 }
1575
1576                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1577                 {
1578                         if (a.Type == pa.IndexerName) {
1579                                 // Attribute was copied to container
1580                                 return;
1581                         }
1582
1583                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
1584                 }
1585
1586                 protected override bool CheckForDuplications ()
1587                 {
1588                         return Parent.MemberCache.CheckExistingMembersOverloads (this, parameters);
1589                 }
1590
1591                 public override bool Define ()
1592                 {
1593                         if (!base.Define ())
1594                                 return false;
1595
1596                         if (!DefineParameters (parameters))
1597                                 return false;
1598
1599                         if (OptAttributes != null) {
1600                                 Attribute indexer_attr = OptAttributes.Search (Module.PredefinedAttributes.IndexerName);
1601                                 if (indexer_attr != null) {
1602                                         var compiling = indexer_attr.Type.MemberDefinition as TypeContainer;
1603                                         if (compiling != null)
1604                                                 compiling.Define ();
1605
1606                                         if (IsExplicitImpl) {
1607                                                 Report.Error (415, indexer_attr.Location,
1608                                                         "The `{0}' attribute is valid only on an indexer that is not an explicit interface member declaration",
1609                                                         indexer_attr.Type.GetSignatureForError ());
1610                                         } else if ((ModFlags & Modifiers.OVERRIDE) != 0) {
1611                                                 Report.Error (609, indexer_attr.Location,
1612                                                         "Cannot set the `IndexerName' attribute on an indexer marked override");
1613                                         } else {
1614                                                 string name = indexer_attr.GetIndexerAttributeValue ();
1615
1616                                                 if (!string.IsNullOrEmpty (name)) {
1617                                                         SetMemberName (new MemberName (MemberName.Left, name, Location));
1618                                                 }
1619                                         }
1620                                 }
1621                         }
1622
1623                         if (InterfaceType != null) {
1624                                 string base_IndexerName = InterfaceType.MemberDefinition.GetAttributeDefaultMember ();
1625                                 if (base_IndexerName != ShortName) {
1626                                         SetMemberName (new MemberName (MemberName.Left, base_IndexerName, new TypeExpression (InterfaceType, Location), Location));
1627                                 }
1628                         }
1629
1630                         Parent.AddNameToContainer (this, MemberName.Basename);
1631
1632                         flags |= MethodAttributes.HideBySig | MethodAttributes.SpecialName;
1633
1634                         if (!DefineAccessors ())
1635                                 return false;
1636
1637                         if (!CheckBase ())
1638                                 return false;
1639
1640                         DefineBuilders (MemberKind.Indexer, parameters);
1641                         return true;
1642                 }
1643
1644                 public override bool EnableOverloadChecks (MemberCore overload)
1645                 {
1646                         if (overload is Indexer) {
1647                                 caching_flags |= Flags.MethodOverloadsExist;
1648                                 return true;
1649                         }
1650
1651                         return base.EnableOverloadChecks (overload);
1652                 }
1653
1654                 public override void Emit ()
1655                 {
1656                         parameters.CheckConstraints (this);
1657
1658                         base.Emit ();
1659                 }
1660
1661                 public override string GetSignatureForError ()
1662                 {
1663                         StringBuilder sb = new StringBuilder (Parent.GetSignatureForError ());
1664                         if (MemberName.ExplicitInterface != null) {
1665                                 sb.Append (".");
1666                                 sb.Append (MemberName.ExplicitInterface.GetSignatureForError ());
1667                         }
1668
1669                         sb.Append (".this");
1670                         sb.Append (parameters.GetSignatureForError ("[", "]", parameters.Count));
1671                         return sb.ToString ();
1672                 }
1673
1674                 public override string GetSignatureForDocumentation ()
1675                 {
1676                         return base.GetSignatureForDocumentation () + parameters.GetSignatureForDocumentation ();
1677                 }
1678
1679                 protected override bool VerifyClsCompliance ()
1680                 {
1681                         if (!base.VerifyClsCompliance ())
1682                                 return false;
1683
1684                         parameters.VerifyClsCompliance (this);
1685                         return true;
1686                 }
1687         }
1688
1689         public class IndexerSpec : PropertySpec, IParametersMember
1690         {
1691                 AParametersCollection parameters;
1692
1693                 public IndexerSpec (TypeSpec declaringType, IMemberDefinition definition, TypeSpec memberType, AParametersCollection parameters, PropertyInfo info, Modifiers modifiers)
1694                         : base (MemberKind.Indexer, declaringType, definition, memberType, info, modifiers)
1695                 {
1696                         this.parameters = parameters;
1697                 }
1698
1699                 #region Properties
1700                 public AParametersCollection Parameters {
1701                         get {
1702                                 return parameters;
1703                         }
1704                 }
1705                 #endregion
1706
1707                 public override string GetSignatureForDocumentation ()
1708                 {
1709                         return base.GetSignatureForDocumentation () + parameters.GetSignatureForDocumentation ();
1710                 }
1711
1712                 public override string GetSignatureForError ()
1713                 {
1714                         return DeclaringType.GetSignatureForError () + ".this" + parameters.GetSignatureForError ("[", "]", parameters.Count);
1715                 }
1716
1717                 public override MemberSpec InflateMember (TypeParameterInflator inflator)
1718                 {
1719                         var spec = (IndexerSpec) base.InflateMember (inflator);
1720                         spec.parameters = parameters.Inflate (inflator);
1721                         return spec;
1722                 }
1723
1724                 public override List<MissingTypeSpecReference> ResolveMissingDependencies (MemberSpec caller)
1725                 {
1726                         var missing = base.ResolveMissingDependencies (caller);
1727
1728                         foreach (var pt in parameters.Types) {
1729                                 var m = pt.GetMissingDependencies (caller);
1730                                 if (m == null)
1731                                         continue;
1732
1733                                 if (missing == null)
1734                                         missing = new List<MissingTypeSpecReference> ();
1735
1736                                 missing.AddRange (m);
1737                         }
1738
1739                         return missing;
1740                 }
1741         }
1742 }