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                                         CheckModifiers (ModFlags);
 341                                         ModFlags |= (method.ModFlags & (~Modifiers.AccessibilityMask));
 342                                         ModFlags |= Modifiers.PROPERTY_CUSTOM;
 343
 344                                         if (container.Kind == MemberKind.Interface) {
 345                                                 Report.Error (275, Location, "`{0}': accessibility modifiers may not be used on accessors in an interface",
 346                                                         GetSignatureForError ());
 347                                         } else if ((ModFlags & Modifiers.PRIVATE) != 0) {
 348                                                 if ((method.ModFlags & Modifiers.ABSTRACT) != 0) {
 349                                                         Report.Error (442, Location, "`{0}': abstract properties cannot have private accessors", GetSignatureForError ());
 350                                                 }
 351
 352                                                 ModFlags &= ~Modifiers.VIRTUAL;
 353                                         }
 354
 355                                         flags = ModifiersExtensions.MethodAttr (ModFlags) | MethodAttributes.SpecialName;
 356                                 }
 357
 358                                 CheckAbstractAndExtern (block != null);
 359                                 CheckProtectedModifier ();
 360
 361                                 if (block != null) {
 362                                         if (block.IsIterator)
 363                                                 Iterator.CreateIterator (this, Parent.PartialContainer, ModFlags);
 364
 365                                         if (Compiler.Settings.WriteMetadataOnly)
 366                                                 block = null;
 367                                 }
 368                         }
 369
 370                         public bool HasCustomAccessModifier {
 371                                 get {
 372                                         return (ModFlags & Modifiers.PROPERTY_CUSTOM) != 0;
 373                                 }
 374                         }
 375
 376                         public PropertyBase Property {
 377                                 get {
 378                                         return method;
 379                                 }
 380                         }
 381
 382                         public override ObsoleteAttribute GetAttributeObsolete ()
 383                         {
 384                                 return method.GetAttributeObsolete ();
 385                         }
 386
 387                         public override string GetSignatureForError()
 388                         {
 389                                 return method.GetSignatureForError () + "." + prefix.Substring (0, 3);
 390                         }
 391
 392                         void CheckModifiers (Modifiers modflags)
 393                         {
 394                                 if (!ModifiersExtensions.IsRestrictedModifier (modflags & Modifiers.AccessibilityMask, method.ModFlags & Modifiers.AccessibilityMask)) {
 395                                         Report.Error (273, Location,
 396                                                 "The accessibility modifier of the `{0}' accessor must be more restrictive than the modifier of the property or indexer `{1}'",
 397                                                 GetSignatureForError (), method.GetSignatureForError ());
 398                                 }
 399                         }
 400                 }
 401
 402                 PropertyMethod get, set, first;
 403                 PropertyBuilder PropertyBuilder;
 404
 405                 protected PropertyBase (TypeDefinition parent, FullNamedExpression type, Modifiers mod_flags, Modifiers allowed_mod, MemberName name, Attributes attrs)
 406                         : base (parent, type, mod_flags, allowed_mod, name, attrs)
 407                 {
 408                 }
 409
 410                 #region Properties
 411
 412                 public override AttributeTargets AttributeTargets {
 413                         get {
 414                                 return AttributeTargets.Property;
 415                         }
 416                 }
 417
 418                 public PropertyMethod AccessorFirst {
 419                         get {
 420                                 return first;
 421                         }
 422                 }
 423
 424                 public PropertyMethod AccessorSecond {
 425                         get {
 426                                 return first == get ? set : get;
 427                         }
 428                 }
 429
 430                 public override Variance ExpectedMemberTypeVariance {
 431                         get {
 432                                 return (get != null && set != null) ?
 433                                         Variance.None : set == null ?
 434                                         Variance.Covariant :
 435                                         Variance.Contravariant;
 436                         }
 437                 }
 438
 439                 public PropertyMethod Get {
 440                         get {
 441                                 return get;
 442                         }
 443                         set {
 444                                 get = value;
 445                                 if (first == null)
 446                                         first = value;
 447
 448                                 Parent.AddNameToContainer (get, get.MemberName.Basename);
 449                         }
 450                 }
 451
 452                 public PropertyMethod Set {
 453                         get {
 454                                 return set;
 455                         }
 456                         set {
 457                                 set = value;
 458                                 if (first == null)
 459                                         first = value;
 460
 461                                 Parent.AddNameToContainer (set, set.MemberName.Basename);
 462                         }
 463                 }
 464
 465                 public override string[] ValidAttributeTargets {
 466                         get {
 467                                 return attribute_targets;
 468                         }
 469                 }
 470
 471                 #endregion
 472
 473                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 474                 {
 475                         if (a.HasSecurityAttribute) {
 476                                 a.Error_InvalidSecurityParent ();
 477                                 return;
 478                         }
 479
 480                         if (a.Type == pa.Dynamic) {
 481                                 a.Error_MisusedDynamicAttribute ();
 482                                 return;
 483                         }
 484
 485                         PropertyBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
 486                 }
 487
 488                 void CheckMissingAccessor (MemberKind kind, ParametersCompiled parameters, bool get)
 489                 {
 490                         if (IsExplicitImpl) {
 491                                 MemberFilter filter;
 492                                 if (kind == MemberKind.Indexer)
 493                                         filter = new MemberFilter (MemberCache.IndexerNameAlias, 0, kind, parameters, null);
 494                                 else
 495                                         filter = new MemberFilter (MemberName.Name, 0, kind, null, null);
 496
 497                                 var implementing = MemberCache.FindMember (InterfaceType, filter, BindingRestriction.DeclaredOnly) as PropertySpec;
 498
 499                                 if (implementing == null)
 500                                         return;
 501
 502                                 var accessor = get ? implementing.Get : implementing.Set;
 503                                 if (accessor != null) {
 504                                         Report.SymbolRelatedToPreviousError (accessor);
 505                                         Report.Error (551, Location, "Explicit interface implementation `{0}' is missing accessor `{1}'",
 506                                                 GetSignatureForError (), accessor.GetSignatureForError ());
 507                                 }
 508                         }
 509                 }
 510
 511                 protected override bool CheckOverrideAgainstBase (MemberSpec base_member)
 512                 {
 513                         var ok = base.CheckOverrideAgainstBase (base_member);
 514
 515                         //
 516                         // Check base property accessors conflict
 517                         //
 518                         var base_prop = (PropertySpec) base_member;
 519                         if (Get == null) {
 520                                 if ((ModFlags & Modifiers.SEALED) != 0 && base_prop.HasGet && !base_prop.Get.IsAccessible (this)) {
 521                                         // TODO: Should be different error code but csc uses for some reason same
 522                                         Report.SymbolRelatedToPreviousError (base_prop);
 523                                         Report.Error (545, Location,
 524                                                 "`{0}': cannot override because `{1}' does not have accessible get accessor",
 525                                                 GetSignatureForError (), base_prop.GetSignatureForError ());
 526                                         ok = false;
 527                                 }
 528                         } else {
 529                                 if (!base_prop.HasGet) {
 530                                         if (ok) {
 531                                                 Report.SymbolRelatedToPreviousError (base_prop);
 532                                                 Report.Error (545, Get.Location,
 533                                                         "`{0}': cannot override because `{1}' does not have an overridable get accessor",
 534                                                         Get.GetSignatureForError (), base_prop.GetSignatureForError ());
 535                                                 ok = false;
 536                                         }
 537                                 } else if (Get.HasCustomAccessModifier || base_prop.HasDifferentAccessibility) {
 538                                         if (!base_prop.Get.IsAccessible (this)) {
 539                                                 // Same as csc but it should be different error code
 540                                                 Report.Error (115, Get.Location, "`{0}' is marked as an override but no accessible `get' accessor found to override",
 541                                                         GetSignatureForError ());
 542                                                 ok = false;
 543                                         } else if (!CheckAccessModifiers (Get, base_prop.Get)) {
 544                                                 Error_CannotChangeAccessModifiers (Get, base_prop.Get);
 545                                                 ok = false;
 546                                         }
 547                                 }
 548                         }
 549
 550                         if (Set == null) {
 551                                 if ((ModFlags & Modifiers.SEALED) != 0 && base_prop.HasSet && !base_prop.Set.IsAccessible (this)) {
 552                                         // TODO: Should be different error code but csc uses for some reason same
 553                                         Report.SymbolRelatedToPreviousError (base_prop);
 554                                         Report.Error (546, Location,
 555                                                 "`{0}': cannot override because `{1}' does not have accessible set accessor",
 556                                                 GetSignatureForError (), base_prop.GetSignatureForError ());
 557                                         ok = false;
 558                                 }
 559
 560                                 if (Get.IsCompilerGenerated) {
 561                                         Report.Error (8080, Location, "`{0}': Auto-implemented properties must override all accessors of the overridden property",
 562                                                 GetSignatureForError ());
 563                                         ok = false;
 564                                 }
 565                         } else {
 566                                 if (!base_prop.HasSet) {
 567                                         if (ok) {
 568                                                 Report.SymbolRelatedToPreviousError (base_prop);
 569                                                 Report.Error (546, Set.Location,
 570                                                         "`{0}': cannot override because `{1}' does not have an overridable set accessor",
 571                                                         Set.GetSignatureForError (), base_prop.GetSignatureForError ());
 572                                                 ok = false;
 573                                         }
 574                                 } else if (Set.HasCustomAccessModifier || base_prop.HasDifferentAccessibility) {
 575                                         if (!base_prop.Set.IsAccessible (this)) {
 576                                                 // Same as csc but it should be different error code
 577                                                 Report.Error (115, Set.Location, "`{0}' is marked as an override but no accessible `set' accessor found to override",
 578                                                         GetSignatureForError ());
 579                                                 ok = false;
 580                                         } else if (!CheckAccessModifiers (Set, base_prop.Set)) {
 581                                                 Error_CannotChangeAccessModifiers (Set, base_prop.Set);
 582                                                 ok = false;
 583                                         }
 584                                 }
 585                         }
 586
 587                         if ((Set == null || !Set.HasCustomAccessModifier) && (Get == null || !Get.HasCustomAccessModifier)) {
 588                                 if (!CheckAccessModifiers (this, base_prop)) {
 589                                         Error_CannotChangeAccessModifiers (this, base_prop);
 590                                         ok = false;
 591                                 }
 592                         }
 593
 594                         return ok;
 595                 }
 596
 597                 protected override void DoMemberTypeDependentChecks ()
 598                 {
 599                         base.DoMemberTypeDependentChecks ();
 600
 601                         IsTypePermitted ();
 602
 603                         if (MemberType.IsStatic)
 604                                 Error_StaticReturnType ();
 605                 }
 606
 607                 protected override void DoMemberTypeIndependentChecks ()
 608                 {
 609                         base.DoMemberTypeIndependentChecks ();
 610
 611                         //
 612                         // Accessors modifiers check
 613                         //
 614                         if (AccessorSecond != null) {
 615                                 if ((Get.ModFlags & Modifiers.AccessibilityMask) != 0 && (Set.ModFlags & Modifiers.AccessibilityMask) != 0) {
 616                                         Report.Error (274, Location, "`{0}': Cannot specify accessibility modifiers for both accessors of the property or indexer",
 617                                                 GetSignatureForError ());
 618                                 }
 619                         } else if ((ModFlags & Modifiers.OVERRIDE) == 0 &&
 620                                 (Get == null && (Set.ModFlags & Modifiers.AccessibilityMask) != 0) ||
 621                                 (Set == null && (Get.ModFlags & Modifiers.AccessibilityMask) != 0)) {
 622                                 Report.Error (276, Location,
 623                                               "`{0}': accessibility modifiers on accessors may only be used if the property or indexer has both a get and a set accessor",
 624                                               GetSignatureForError ());
 625                         }
 626                 }
 627
 628                 protected bool DefineAccessors ()
 629                 {
 630                         first.Define (Parent);
 631                         if (AccessorSecond != null)
 632                                 AccessorSecond.Define (Parent);
 633
 634                         return true;
 635                 }
 636
 637                 protected void DefineBuilders (MemberKind kind, ParametersCompiled parameters)
 638                 {
 639                         PropertyBuilder = Parent.TypeBuilder.DefineProperty (
 640                                 GetFullName (MemberName), PropertyAttributes.None,
 641 #if !BOOTSTRAP_BASIC    // Requires trunk version mscorlib
 642                                 IsStatic ? 0 : CallingConventions.HasThis,
 643 #endif
 644                                 MemberType.GetMetaInfo (), null, null,
 645                                 parameters.GetMetaInfo (), null, null);
 646
 647                         PropertySpec spec;
 648                         if (kind == MemberKind.Indexer)
 649                                 spec = new IndexerSpec (Parent.Definition, this, MemberType, parameters, PropertyBuilder, ModFlags);
 650                         else
 651                                 spec = new PropertySpec (kind, Parent.Definition, this, MemberType, PropertyBuilder, ModFlags);
 652
 653                         if (Get != null) {
 654                                 spec.Get = Get.Spec;
 655                                 Parent.MemberCache.AddMember (this, Get.Spec.Name, Get.Spec);
 656                         } else {
 657                                 CheckMissingAccessor (kind, parameters, true);
 658                         }
 659
 660                         if (Set != null) {
 661                                 spec.Set = Set.Spec;
 662                                 Parent.MemberCache.AddMember (this, Set.Spec.Name, Set.Spec);
 663                         } else {
 664                                 CheckMissingAccessor (kind, parameters, false);
 665                         }
 666
 667                         Parent.MemberCache.AddMember (this, PropertyBuilder.Name, spec);
 668                 }
 669
 670                 public override void Emit ()
 671                 {
 672                         CheckReservedNameConflict (GetMethod.Prefix, get == null ? null : get.Spec);
 673                         CheckReservedNameConflict (SetMethod.Prefix, set == null ? null : set.Spec);
 674
 675                         if (OptAttributes != null)
 676                                 OptAttributes.Emit ();
 677
 678                         if (member_type.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
 679                                 Module.PredefinedAttributes.Dynamic.EmitAttribute (PropertyBuilder);
 680                         } else if (member_type.HasDynamicElement) {
 681                                 Module.PredefinedAttributes.Dynamic.EmitAttribute (PropertyBuilder, member_type, Location);
 682                         }
 683
 684                         ConstraintChecker.Check (this, member_type, type_expr.Location);
 685
 686                         first.Emit (Parent);
 687                         if (AccessorSecond != null)
 688                                 AccessorSecond.Emit (Parent);
 689
 690                         base.Emit ();
 691                 }
 692
 693                 public override bool IsUsed {
 694                         get {
 695                                 if (IsExplicitImpl)
 696                                         return true;
 697
 698                                 return Get.IsUsed | Set.IsUsed;
 699                         }
 700                 }
 701
 702                 public override void PrepareEmit ()
 703                 {
 704                         AccessorFirst.PrepareEmit ();
 705                         if (AccessorSecond != null)
 706                                 AccessorSecond.PrepareEmit ();
 707
 708                         if (get != null) {
 709                                 var method = Get.Spec.GetMetaInfo () as MethodBuilder;
 710                                 if (method != null)
 711                                         PropertyBuilder.SetGetMethod (method);
 712                         }
 713
 714                         if (set != null) {
 715                                 var method = Set.Spec.GetMetaInfo () as MethodBuilder;
 716                                 if (method != null)
 717                                         PropertyBuilder.SetSetMethod (method);
 718                         }
 719                 }
 720
 721                 protected override void SetMemberName (MemberName new_name)
 722                 {
 723                         base.SetMemberName (new_name);
 724
 725                         if (Get != null)
 726                                 Get.UpdateName (this);
 727
 728                         if (Set != null)
 729                                 Set.UpdateName (this);
 730                 }
 731
 732                 public override void WriteDebugSymbol (MonoSymbolFile file)
 733                 {
 734                         if (get != null)
 735                                 get.WriteDebugSymbol (file);
 736
 737                         if (set != null)
 738                                 set.WriteDebugSymbol (file);
 739                 }
 740
 741                 //
 742                 //   Represents header string for documentation comment.
 743                 //
 744                 public override string DocCommentHeader {
 745                         get { return "P:"; }
 746                 }
 747         }
 748
 749         public class Property : PropertyBase
 750         {
 751                 public sealed class BackingFieldDeclaration : Field
 752                 {
 753                         readonly Property property;
 754                         const Modifiers DefaultModifiers = Modifiers.BACKING_FIELD | Modifiers.COMPILER_GENERATED | Modifiers.PRIVATE | Modifiers.DEBUGGER_HIDDEN;
 755
 756                         public BackingFieldDeclaration (Property p, bool readOnly)
 757                                 : base (p.Parent, p.type_expr, DefaultModifiers | (p.ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE)),
 758                                 new MemberName ("<" + p.GetFullName (p.MemberName) + ">k__BackingField", p.Location), null)
 759                         {
 760                                 this.property = p;
 761                                 if (readOnly)
 762                                         ModFlags |= Modifiers.READONLY;
 763                         }
 764
 765                         public Property OriginalProperty {
 766                                 get {
 767                                         return property;
 768                                 }
 769                         }
 770
 771                         public override string GetSignatureForError ()
 772                         {
 773                                 return property.GetSignatureForError ();
 774                         }
 775                 }
 776
 777                 static readonly string[] attribute_target_auto = new string[] { "property", "field" };
 778
 779                 public Property (TypeDefinition parent, FullNamedExpression type, Modifiers mod,
 780                                  MemberName name, Attributes attrs)
 781                         : base (parent, type, mod,
 782                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedModifiersInterface :
 783                                 parent.PartialContainer.Kind == MemberKind.Struct ? AllowedModifiersStruct :
 784                                 AllowedModifiersClass,
 785                                 name, attrs)
 786                 {
 787                 }
 788
 789                 public BackingFieldDeclaration BackingField { get; private set; }
 790
 791                 public Expression Initializer { get; set; }
 792
 793                 public override void Accept (StructuralVisitor visitor)
 794                 {
 795                         visitor.Visit (this);
 796                 }
 797
 798                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 799                 {
 800                         if (a.Target == AttributeTargets.Field) {
 801                                 BackingField.ApplyAttributeBuilder (a, ctor, cdata, pa);
 802                                 return;
 803                         }
 804
 805                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
 806                 }
 807
 808                 void CreateAutomaticProperty ()
 809                 {
 810                         // Create backing field
 811                         BackingField = new BackingFieldDeclaration (this, Initializer == null && Set == null);
 812                         if (!BackingField.Define ())
 813                                 return;
 814
 815                         if (Initializer != null) {
 816                                 BackingField.Initializer = Initializer;
 817                                 Parent.RegisterFieldForInitialization (BackingField, new FieldInitializer (BackingField, Initializer, Location));
 818                                 BackingField.ModFlags |= Modifiers.READONLY;
 819                         }
 820
 821                         Parent.PartialContainer.Members.Add (BackingField);
 822
 823                         FieldExpr fe = new FieldExpr (BackingField, Location);
 824                         if ((BackingField.ModFlags & Modifiers.STATIC) == 0)
 825                                 fe.InstanceExpression = new CompilerGeneratedThis (Parent.CurrentType, Location);
 826
 827                         //
 828                         // Create get block but we careful with location to
 829                         // emit only single sequence point per accessor. This allow
 830                         // to set a breakpoint on it even with no user code
 831                         //
 832                         Get.Block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location.Null);
 833                         Return r = new Return (fe, Get.Location);
 834                         Get.Block.AddStatement (r);
 835                         Get.ModFlags |= Modifiers.COMPILER_GENERATED;
 836
 837                         // Create set block
 838                         if (Set != null) {
 839                                 Set.Block = new ToplevelBlock (Compiler, Set.ParameterInfo, Location.Null);
 840                                 Assign a = new SimpleAssign (fe, new SimpleName ("value", Location.Null), Location.Null);
 841                                 Set.Block.AddStatement (new StatementExpression (a, Set.Location));
 842                                 Set.ModFlags |= Modifiers.COMPILER_GENERATED;
 843                         }
 844                 }
 845
 846                 public override bool Define ()
 847                 {
 848                         if (!base.Define ())
 849                                 return false;
 850
 851                         flags |= MethodAttributes.HideBySig | MethodAttributes.SpecialName;
 852
 853                         bool auto = AccessorFirst.Block == null && (AccessorSecond == null || AccessorSecond.Block == null) &&
 854                                 (ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN)) == 0;
 855
 856                         if (Initializer != null) {
 857                                 if (!auto)
 858                                         Report.Error (8050, Location, "`{0}': Only auto-implemented properties can have initializers",
 859                                                 GetSignatureForError ());
 860
 861                                 if (IsInterface)
 862                                         Report.Error (8052, Location, "`{0}': Properties inside interfaces cannot have initializers",
 863                                                 GetSignatureForError ());
 864
 865                                 if (Compiler.Settings.Version < LanguageVersion.V_6)
 866                                         Report.FeatureIsNotAvailable (Compiler, Location, "auto-implemented property initializer");
 867                         }
 868
 869                         if (auto) {
 870                                 if (Get == null) {
 871                                         Report.Error (8051, Location, "Auto-implemented property `{0}' must have get accessor",
 872                                                 GetSignatureForError ());
 873                                         return false;
 874                                 }
 875
 876                                 if (Compiler.Settings.Version < LanguageVersion.V_3 && Initializer == null)
 877                                         Report.FeatureIsNotAvailable (Compiler, Location, "auto-implemented properties");
 878
 879                                 CreateAutomaticProperty ();
 880                         }
 881
 882                         if (!DefineAccessors ())
 883                                 return false;
 884
 885                         if (AccessorSecond == null) {
 886                                 PropertyMethod pm;
 887                                 if (AccessorFirst is GetMethod)
 888                                         pm = new SetMethod (this, 0, ParametersCompiled.EmptyReadOnlyParameters, null, Location);
 889                                 else
 890                                         pm = new GetMethod (this, 0, null, Location);
 891
 892                                 Parent.AddNameToContainer (pm, pm.MemberName.Basename);
 893                         }
 894
 895                         if (!CheckBase ())
 896                                 return false;
 897
 898                         DefineBuilders (MemberKind.Property, ParametersCompiled.EmptyReadOnlyParameters);
 899                         return true;
 900                 }
 901
 902                 public override void Emit ()
 903                 {
 904                         if ((AccessorFirst.ModFlags & (Modifiers.STATIC | Modifiers.COMPILER_GENERATED)) == Modifiers.COMPILER_GENERATED && Parent.PartialContainer.HasExplicitLayout) {
 905                                 Report.Error (842, Location,
 906                                         "Automatically implemented property `{0}' cannot be used inside a type with an explicit StructLayout attribute",
 907                                         GetSignatureForError ());
 908                         }
 909
 910                         base.Emit ();
 911                 }
 912
 913                 public override string[] ValidAttributeTargets {
 914                         get {
 915                                 return Get != null && ((Get.ModFlags & Modifiers.COMPILER_GENERATED) != 0) ?
 916                                         attribute_target_auto : base.ValidAttributeTargets;
 917                         }
 918                 }
 919         }
 920
 921         /// <summary>
 922         /// For case when event is declared like property (with add and remove accessors).
 923         /// </summary>
 924         public class EventProperty: Event {
 925                 public abstract class AEventPropertyAccessor : AEventAccessor
 926                 {
 927                         protected AEventPropertyAccessor (EventProperty method, string prefix, Attributes attrs, Location loc)
 928                                 : base (method, prefix, attrs, loc)
 929                         {
 930                         }
 931
 932                         public override void Define (TypeContainer ds)
 933                         {
 934                                 CheckAbstractAndExtern (block != null);
 935                                 base.Define (ds);
 936                         }
 937
 938                         public override string GetSignatureForError ()
 939                         {
 940                                 return method.GetSignatureForError () + "." + prefix.Substring (0, prefix.Length - 1);
 941                         }
 942                 }
 943
 944                 public sealed class AddDelegateMethod: AEventPropertyAccessor
 945                 {
 946                         public AddDelegateMethod (EventProperty method, Attributes attrs, Location loc)
 947                                 : base (method, AddPrefix, attrs, loc)
 948                         {
 949                         }
 950                 }
 951
 952                 public sealed class RemoveDelegateMethod: AEventPropertyAccessor
 953                 {
 954                         public RemoveDelegateMethod (EventProperty method, Attributes attrs, Location loc)
 955                                 : base (method, RemovePrefix, attrs, loc)
 956                         {
 957                         }
 958                 }
 959
 960                 static readonly string[] attribute_targets = new string [] { "event" };
 961
 962                 public EventProperty (TypeDefinition parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
 963                         : base (parent, type, mod_flags, name, attrs)
 964                 {
 965                 }
 966
 967                 public override void Accept (StructuralVisitor visitor)
 968                 {
 969                         visitor.Visit (this);
 970                 }
 971
 972                 public override bool Define()
 973                 {
 974                         if (!base.Define ())
 975                                 return false;
 976
 977                         SetIsUsed ();
 978                         return true;
 979                 }
 980
 981                 public override string[] ValidAttributeTargets {
 982                         get {
 983                                 return attribute_targets;
 984                         }
 985                 }
 986         }
 987
 988         /// <summary>
 989         /// Event is declared like field.
 990         /// </summary>
 991         public class EventField : Event
 992         {
 993                 abstract class EventFieldAccessor : AEventAccessor
 994                 {
 995                         protected EventFieldAccessor (EventField method, string prefix)
 996                                 : base (method, prefix, null, method.Location)
 997                         {
 998                         }
 999
1000                         protected abstract MethodSpec GetOperation (Location loc);
1001
1002                         public override void Emit (TypeDefinition parent)
1003                         {
1004                                 if ((method.ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN)) == 0 && !Compiler.Settings.WriteMetadataOnly) {
1005                                         block = new ToplevelBlock (Compiler, ParameterInfo, Location) {
1006                                                 IsCompilerGenerated = true
1007                                         };
1008                                         FabricateBodyStatement ();
1009                                 }
1010
1011                                 base.Emit (parent);
1012                         }
1013
1014                         void FabricateBodyStatement ()
1015                         {
1016                                 //
1017                                 // Delegate obj1 = backing_field
1018                                 // do {
1019                                 //   Delegate obj2 = obj1;
1020                                 //   obj1 = Interlocked.CompareExchange (ref backing_field, Delegate.Combine|Remove(obj2, value), obj1);
1021                                 // } while ((object)obj1 != (object)obj2)
1022                                 //
1023
1024                                 var field_info = ((EventField) method).backing_field;
1025                                 FieldExpr f_expr = new FieldExpr (field_info, Location);
1026                                 if (!IsStatic)
1027                                         f_expr.InstanceExpression = new CompilerGeneratedThis (Parent.CurrentType, Location);
1028
1029                                 var obj1 = LocalVariable.CreateCompilerGenerated (field_info.MemberType, block, Location);
1030                                 var obj2 = LocalVariable.CreateCompilerGenerated (field_info.MemberType, block, Location);
1031
1032                                 block.AddStatement (new StatementExpression (new SimpleAssign (new LocalVariableReference (obj1, Location), f_expr)));
1033
1034                                 var cond = new BooleanExpression (new Binary (Binary.Operator.Inequality,
1035                                         new Cast (new TypeExpression (Module.Compiler.BuiltinTypes.Object, Location), new LocalVariableReference (obj1, Location), Location),
1036                                         new Cast (new TypeExpression (Module.Compiler.BuiltinTypes.Object, Location), new LocalVariableReference (obj2, Location), Location)));
1037
1038                                 var body = new ExplicitBlock (block, Location, Location);
1039                                 block.AddStatement (new Do (body, cond, Location, Location));
1040
1041                                 body.AddStatement (new StatementExpression (
1042                                         new SimpleAssign (new LocalVariableReference (obj2, Location), new LocalVariableReference (obj1, Location))));
1043
1044                                 var args_oper = new Arguments (2);
1045                                 args_oper.Add (new Argument (new LocalVariableReference (obj2, Location)));
1046                                 args_oper.Add (new Argument (block.GetParameterReference (0, Location)));
1047
1048                                 var op_method = GetOperation (Location);
1049
1050                                 var args = new Arguments (3);
1051                                 args.Add (new Argument (f_expr, Argument.AType.Ref));
1052                                 args.Add (new Argument (new Cast (
1053                                         new TypeExpression (field_info.MemberType, Location),
1054                                         new Invocation (MethodGroupExpr.CreatePredefined (op_method, op_method.DeclaringType, Location), args_oper),
1055                                         Location)));
1056                                 args.Add (new Argument (new LocalVariableReference (obj1, Location)));
1057
1058                                 var cas = Module.PredefinedMembers.InterlockedCompareExchange_T.Get ();
1059                                 if (cas == null) {
1060                                         if (Module.PredefinedMembers.MonitorEnter_v4.Get () != null || Module.PredefinedMembers.MonitorEnter.Get () != null) {
1061                                                 // Workaround for cripled (e.g. microframework) mscorlib without CompareExchange
1062                                                 body.AddStatement (new Lock (
1063                                                         block.GetParameterReference (0, Location),
1064                                                         new StatementExpression (new SimpleAssign (
1065                                                                 f_expr, args [1].Expr, Location), Location), Location));
1066                                         } else {
1067                                                 Module.PredefinedMembers.InterlockedCompareExchange_T.Resolve (Location);
1068                                         }
1069                                 } else {
1070                                         body.AddStatement (new StatementExpression (new SimpleAssign (
1071                                                 new LocalVariableReference (obj1, Location),
1072                                                 new Invocation (MethodGroupExpr.CreatePredefined (cas, cas.DeclaringType, Location), args))));
1073                                 }
1074                         }
1075                 }
1076
1077                 sealed class AddDelegateMethod: EventFieldAccessor
1078                 {
1079                         public AddDelegateMethod (EventField method):
1080                                 base (method, AddPrefix)
1081                         {
1082                         }
1083
1084                         protected override MethodSpec GetOperation (Location loc)
1085                         {
1086                                 return Module.PredefinedMembers.DelegateCombine.Resolve (loc);
1087                         }
1088                 }
1089
1090                 sealed class RemoveDelegateMethod: EventFieldAccessor
1091                 {
1092                         public RemoveDelegateMethod (EventField method):
1093                                 base (method, RemovePrefix)
1094                         {
1095                         }
1096
1097                         protected override MethodSpec GetOperation (Location loc)
1098                         {
1099                                 return Module.PredefinedMembers.DelegateRemove.Resolve (loc);
1100                         }
1101                 }
1102
1103
1104                 static readonly string[] attribute_targets = new string [] { "event", "field", "method" };
1105                 static readonly string[] attribute_targets_interface = new string[] { "event", "method" };
1106
1107                 Expression initializer;
1108                 Field backing_field;
1109                 List<FieldDeclarator> declarators;
1110
1111                 public EventField (TypeDefinition parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
1112                         : base (parent, type, mod_flags, name, attrs)
1113                 {
1114                         Add = new AddDelegateMethod (this);
1115                         Remove = new RemoveDelegateMethod (this);
1116                 }
1117
1118                 #region Properties
1119
1120                 public List<FieldDeclarator> Declarators {
1121                         get {
1122                                 return this.declarators;
1123                         }
1124                 }
1125
1126                 bool HasBackingField {
1127                         get {
1128                                 return !IsInterface && (ModFlags & Modifiers.ABSTRACT) == 0;
1129                         }
1130                 }
1131
1132                 public Expression Initializer {
1133                         get {
1134                                 return initializer;
1135                         }
1136                         set {
1137                                 initializer = value;
1138                         }
1139                 }
1140
1141                 public override string[] ValidAttributeTargets {
1142                         get {
1143                                 return HasBackingField ? attribute_targets : attribute_targets_interface;
1144                         }
1145                 }
1146
1147                 #endregion
1148
1149
1150                 public override void Accept (StructuralVisitor visitor)
1151                 {
1152                         visitor.Visit (this);
1153                 }
1154
1155                 public void AddDeclarator (FieldDeclarator declarator)
1156                 {
1157                         if (declarators == null)
1158                                 declarators = new List<FieldDeclarator> (2);
1159
1160                         declarators.Add (declarator);
1161
1162                         Parent.AddNameToContainer (this, declarator.Name.Value);
1163                 }
1164
1165                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1166                 {
1167                         if (a.Target == AttributeTargets.Field) {
1168                                 backing_field.ApplyAttributeBuilder (a, ctor, cdata, pa);
1169                                 return;
1170                         }
1171
1172                         if (a.Target == AttributeTargets.Method) {
1173                                 int errors = Report.Errors;
1174                                 Add.ApplyAttributeBuilder (a, ctor, cdata, pa);
1175                                 if (errors == Report.Errors)
1176                                         Remove.ApplyAttributeBuilder (a, ctor, cdata, pa);
1177                                 return;
1178                         }
1179
1180                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
1181                 }
1182
1183                 public override bool Define()
1184                 {
1185                         var mod_flags_src = ModFlags;
1186
1187                         if (!base.Define ())
1188                                 return false;
1189
1190                         if (declarators != null) {
1191                                 if ((mod_flags_src & Modifiers.DEFAULT_ACCESS_MODIFIER) != 0)
1192                                         mod_flags_src &= ~(Modifiers.AccessibilityMask | Modifiers.DEFAULT_ACCESS_MODIFIER);
1193
1194                                 var t = new TypeExpression (MemberType, TypeExpression.Location);
1195                                 foreach (var d in declarators) {
1196                                         var ef = new EventField (Parent, t, mod_flags_src, new MemberName (d.Name.Value, d.Name.Location), OptAttributes);
1197
1198                                         if (d.Initializer != null)
1199                                                 ef.initializer = d.Initializer;
1200
1201                                         ef.Define ();
1202                                         Parent.PartialContainer.Members.Add (ef);
1203                                 }
1204                         }
1205
1206                         if (!HasBackingField) {
1207                                 SetIsUsed ();
1208                                 return true;
1209                         }
1210
1211                         backing_field = new Field (Parent,
1212                                 new TypeExpression (MemberType, Location),
1213                                 Modifiers.BACKING_FIELD | Modifiers.COMPILER_GENERATED | Modifiers.PRIVATE | (ModFlags & (Modifiers.STATIC | Modifiers.UNSAFE)),
1214                                 MemberName, null);
1215
1216                         Parent.PartialContainer.Members.Add (backing_field);
1217                         backing_field.Initializer = Initializer;
1218                         backing_field.ModFlags &= ~Modifiers.COMPILER_GENERATED;
1219
1220                         // Call define because we passed fields definition
1221                         backing_field.Define ();
1222
1223                         // Set backing field for event fields
1224                         spec.BackingField = backing_field.Spec;
1225
1226                         return true;
1227                 }
1228         }
1229
1230         public abstract class Event : PropertyBasedMember
1231         {
1232                 public abstract class AEventAccessor : AbstractPropertyEventMethod
1233                 {
1234                         protected readonly Event method;
1235                         readonly ParametersCompiled parameters;
1236
1237                         static readonly string[] attribute_targets = new string [] { "method", "param", "return" };
1238
1239                         public const string AddPrefix = "add_";
1240                         public const string RemovePrefix = "remove_";
1241
1242                         protected AEventAccessor (Event method, string prefix, Attributes attrs, Location loc)
1243                                 : base (method, prefix, attrs, loc)
1244                         {
1245                                 this.method = method;
1246                                 this.ModFlags = method.ModFlags;
1247                                 this.parameters = ParametersCompiled.CreateImplicitParameter (method.TypeExpression, loc);
1248                         }
1249
1250                         public bool IsInterfaceImplementation {
1251                                 get { return method_data.implementing != null; }
1252                         }
1253
1254                         public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1255                         {
1256                                 if (a.Type == pa.MethodImpl) {
1257                                         method.is_external_implementation = a.IsInternalCall ();
1258                                 }
1259
1260                                 base.ApplyAttributeBuilder (a, ctor, cdata, pa);
1261                         }
1262
1263                         protected override void ApplyToExtraTarget (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1264                         {
1265                                 if (a.Target == AttributeTargets.Parameter) {
1266                                         parameters[0].ApplyAttributeBuilder (a, ctor, cdata, pa);
1267                                         return;
1268                                 }
1269
1270                                 base.ApplyToExtraTarget (a, ctor, cdata, pa);
1271                         }
1272
1273                         public override AttributeTargets AttributeTargets {
1274                                 get {
1275                                         return AttributeTargets.Method;
1276                                 }
1277                         }
1278
1279                         public override bool IsClsComplianceRequired ()
1280                         {
1281                                 return method.IsClsComplianceRequired ();
1282                         }
1283
1284                         public virtual void Define (TypeContainer parent)
1285                         {
1286                                 // Fill in already resolved event type to speed things up and
1287                                 // avoid confusing duplicate errors
1288                                 ((Parameter) parameters.FixedParameters[0]).Type = method.member_type;
1289                                 parameters.Types = new TypeSpec[] { method.member_type };
1290
1291                                 method_data = new MethodData (method, method.ModFlags,
1292                                         method.flags | MethodAttributes.HideBySig | MethodAttributes.SpecialName, this);
1293
1294                                 if (!method_data.Define (parent.PartialContainer, method.GetFullName (MemberName)))
1295                                         return;
1296
1297                                 if (Compiler.Settings.WriteMetadataOnly)
1298                                         block = null;
1299
1300                                 Spec = new MethodSpec (MemberKind.Method, parent.PartialContainer.Definition, this, ReturnType, ParameterInfo, method.ModFlags);
1301                                 Spec.IsAccessor = true;
1302                         }
1303
1304                         public override TypeSpec ReturnType {
1305                                 get {
1306                                         return Parent.Compiler.BuiltinTypes.Void;
1307                                 }
1308                         }
1309
1310                         public override ObsoleteAttribute GetAttributeObsolete ()
1311                         {
1312                                 return method.GetAttributeObsolete ();
1313                         }
1314
1315                         public MethodData MethodData {
1316                                 get {
1317                                         return method_data;
1318                                 }
1319                         }
1320
1321                         public override string[] ValidAttributeTargets {
1322                                 get {
1323                                         return attribute_targets;
1324                                 }
1325                         }
1326
1327                         public override ParametersCompiled ParameterInfo {
1328                                 get {
1329                                         return parameters;
1330                                 }
1331                         }
1332                 }
1333
1334                 AEventAccessor add, remove;
1335                 EventBuilder EventBuilder;
1336                 protected EventSpec spec;
1337
1338                 protected Event (TypeDefinition parent, FullNamedExpression type, Modifiers mod_flags, MemberName name, Attributes attrs)
1339                         : base (parent, type, mod_flags,
1340                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedModifiersInterface :
1341                                 parent.PartialContainer.Kind == MemberKind.Struct ? AllowedModifiersStruct :
1342                                 AllowedModifiersClass,
1343                                 name, attrs)
1344                 {
1345                 }
1346
1347                 #region Properties
1348
1349                 public override AttributeTargets AttributeTargets {
1350                         get {
1351                                 return AttributeTargets.Event;
1352                         }
1353                 }
1354
1355                 public AEventAccessor Add {
1356                         get {
1357                                 return this.add;
1358                         }
1359                         set {
1360                                 add = value;
1361                                 Parent.AddNameToContainer (value, value.MemberName.Basename);
1362                         }
1363                 }
1364
1365                 public override Variance ExpectedMemberTypeVariance {
1366                         get {
1367                                 return Variance.Contravariant;
1368                         }
1369                 }
1370
1371                 public AEventAccessor Remove {
1372                         get {
1373                                 return this.remove;
1374                         }
1375                         set {
1376                                 remove = value;
1377                                 Parent.AddNameToContainer (value, value.MemberName.Basename);
1378                         }
1379                 }
1380                 #endregion
1381
1382                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1383                 {
1384                         if ((a.HasSecurityAttribute)) {
1385                                 a.Error_InvalidSecurityParent ();
1386                                 return;
1387                         }
1388
1389                         EventBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
1390                 }
1391
1392                 protected override bool CheckOverrideAgainstBase (MemberSpec base_member)
1393                 {
1394                         var ok = base.CheckOverrideAgainstBase (base_member);
1395
1396                         if (!CheckAccessModifiers (this, base_member)) {
1397                                 Error_CannotChangeAccessModifiers (this, base_member);
1398                                 ok = false;
1399                         }
1400
1401                         return ok;
1402                 }
1403
1404                 public override bool Define ()
1405                 {
1406                         if (!base.Define ())
1407                                 return false;
1408
1409                         if (!MemberType.IsDelegate) {
1410                                 Report.Error (66, Location, "`{0}': event must be of a delegate type", GetSignatureForError ());
1411                         }
1412
1413                         if (!CheckBase ())
1414                                 return false;
1415
1416                         //
1417                         // Now define the accessors
1418                         //
1419                         add.Define (Parent);
1420                         remove.Define (Parent);
1421
1422                         EventBuilder = Parent.TypeBuilder.DefineEvent (GetFullName (MemberName), EventAttributes.None, MemberType.GetMetaInfo ());
1423
1424                         spec = new EventSpec (Parent.Definition, this, MemberType, ModFlags, Add.Spec, remove.Spec);
1425
1426                         Parent.MemberCache.AddMember (this, GetFullName (MemberName), spec);
1427                         Parent.MemberCache.AddMember (this, Add.Spec.Name, Add.Spec);
1428                         Parent.MemberCache.AddMember (this, Remove.Spec.Name, remove.Spec);
1429
1430                         return true;
1431                 }
1432
1433                 public override void Emit ()
1434                 {
1435                         CheckReservedNameConflict (null, add.Spec);
1436                         CheckReservedNameConflict (null, remove.Spec);
1437
1438                         if (OptAttributes != null) {
1439                                 OptAttributes.Emit ();
1440                         }
1441
1442                         ConstraintChecker.Check (this, member_type, type_expr.Location);
1443
1444                         Add.Emit (Parent);
1445                         Remove.Emit (Parent);
1446
1447                         base.Emit ();
1448                 }
1449
1450                 public override void PrepareEmit ()
1451                 {
1452                         add.PrepareEmit ();
1453                         remove.PrepareEmit ();
1454
1455                         EventBuilder.SetAddOnMethod (add.MethodData.MethodBuilder);
1456                         EventBuilder.SetRemoveOnMethod (remove.MethodData.MethodBuilder);
1457                 }
1458
1459                 public override void WriteDebugSymbol (MonoSymbolFile file)
1460                 {
1461                         add.WriteDebugSymbol (file);
1462                         remove.WriteDebugSymbol (file);
1463                 }
1464
1465                 //
1466                 //   Represents header string for documentation comment.
1467                 //
1468                 public override string DocCommentHeader {
1469                         get { return "E:"; }
1470                 }
1471         }
1472
1473         public class EventSpec : MemberSpec, IInterfaceMemberSpec
1474         {
1475                 MethodSpec add, remove;
1476                 FieldSpec backing_field;
1477
1478                 public EventSpec (TypeSpec declaringType, IMemberDefinition definition, TypeSpec eventType, Modifiers modifiers, MethodSpec add, MethodSpec remove)
1479                         : base (MemberKind.Event, declaringType, definition, modifiers)
1480                 {
1481                         this.AccessorAdd = add;
1482                         this.AccessorRemove = remove;
1483                         this.MemberType = eventType;
1484                 }
1485
1486                 #region Properties
1487
1488                 public MethodSpec AccessorAdd {
1489                         get {
1490                                 return add;
1491                         }
1492                         set {
1493                                 add = value;
1494                         }
1495                 }
1496
1497                 public MethodSpec AccessorRemove {
1498                         get {
1499                                 return remove;
1500                         }
1501                         set {
1502                                 remove = value;
1503                         }
1504                 }
1505
1506                 public FieldSpec BackingField {
1507                         get {
1508                                 return backing_field;
1509                         }
1510                         set {
1511                                 backing_field = value;
1512                         }
1513                 }
1514
1515                 public TypeSpec MemberType { get; private set; }
1516
1517                 #endregion
1518
1519                 public override MemberSpec InflateMember (TypeParameterInflator inflator)
1520                 {
1521                         var es = (EventSpec) base.InflateMember (inflator);
1522                         es.MemberType = inflator.Inflate (MemberType);
1523
1524                         if (backing_field != null)
1525                                 es.backing_field = (FieldSpec) backing_field.InflateMember (inflator);
1526
1527                         return es;
1528                 }
1529
1530                 public override List<MissingTypeSpecReference> ResolveMissingDependencies (MemberSpec caller)
1531                 {
1532                         return MemberType.ResolveMissingDependencies (this);
1533                 }
1534         }
1535
1536         public class Indexer : PropertyBase, IParametersMember
1537         {
1538                 public class GetIndexerMethod : GetMethod, IParametersMember
1539                 {
1540                         ParametersCompiled parameters;
1541
1542                         public GetIndexerMethod (PropertyBase property, Modifiers modifiers, ParametersCompiled parameters, Attributes attrs, Location loc)
1543                                 : base (property, modifiers, attrs, loc)
1544                         {
1545                                 this.parameters = parameters;
1546                         }
1547
1548                         public override void Define (TypeContainer parent)
1549                         {
1550                                 // Disable reporting, parameters are resolved twice
1551                                 Report.DisableReporting ();
1552                                 try {
1553                                         parameters.Resolve (this);
1554                                 } finally {
1555                                         Report.EnableReporting ();
1556                                 }
1557
1558                                 base.Define (parent);
1559                         }
1560
1561                         public override ParametersCompiled ParameterInfo {
1562                                 get {
1563                                         return parameters;
1564                                 }
1565                         }
1566
1567                         #region IParametersMember Members
1568
1569                         AParametersCollection IParametersMember.Parameters {
1570                                 get {
1571                                         return parameters;
1572                                 }
1573                         }
1574
1575                         TypeSpec IInterfaceMemberSpec.MemberType {
1576                                 get {
1577                                         return ReturnType;
1578                                 }
1579                         }
1580
1581                         #endregion
1582                 }
1583
1584                 public class SetIndexerMethod : SetMethod, IParametersMember
1585                 {
1586                         public SetIndexerMethod (PropertyBase property, Modifiers modifiers, ParametersCompiled parameters, Attributes attrs, Location loc)
1587                                 : base (property, modifiers, parameters, attrs, loc)
1588                         {
1589                         }
1590
1591                         #region IParametersMember Members
1592
1593                         AParametersCollection IParametersMember.Parameters {
1594                                 get {
1595                                         return parameters;
1596                                 }
1597                         }
1598
1599                         TypeSpec IInterfaceMemberSpec.MemberType {
1600                                 get {
1601                                         return ReturnType;
1602                                 }
1603                         }
1604
1605                         #endregion
1606                 }
1607
1608                 const Modifiers AllowedModifiers =
1609                         Modifiers.NEW |
1610                         Modifiers.PUBLIC |
1611                         Modifiers.PROTECTED |
1612                         Modifiers.INTERNAL |
1613                         Modifiers.PRIVATE |
1614                         Modifiers.VIRTUAL |
1615                         Modifiers.SEALED |
1616                         Modifiers.OVERRIDE |
1617                         Modifiers.UNSAFE |
1618                         Modifiers.EXTERN |
1619                         Modifiers.ABSTRACT;
1620
1621                 const Modifiers AllowedInterfaceModifiers =
1622                         Modifiers.NEW;
1623
1624                 readonly ParametersCompiled parameters;
1625
1626                 public Indexer (TypeDefinition parent, FullNamedExpression type, MemberName name, Modifiers mod, ParametersCompiled parameters, Attributes attrs)
1627                         : base (parent, type, mod,
1628                                 parent.PartialContainer.Kind == MemberKind.Interface ? AllowedInterfaceModifiers : AllowedModifiers,
1629                                 name, attrs)
1630                 {
1631                         this.parameters = parameters;
1632                 }
1633
1634                 #region Properties
1635
1636                 AParametersCollection IParametersMember.Parameters {
1637                         get {
1638                                 return parameters;
1639                         }
1640                 }
1641
1642                 public ParametersCompiled ParameterInfo {
1643                         get {
1644                                 return parameters;
1645                         }
1646                 }
1647
1648                 #endregion
1649
1650
1651                 public override void Accept (StructuralVisitor visitor)
1652                 {
1653                         visitor.Visit (this);
1654                 }
1655
1656                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
1657                 {
1658                         if (a.Type == pa.IndexerName) {
1659                                 // Attribute was copied to container
1660                                 return;
1661                         }
1662
1663                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
1664                 }
1665
1666                 protected override bool CheckForDuplications ()
1667                 {
1668                         return Parent.MemberCache.CheckExistingMembersOverloads (this, parameters);
1669                 }
1670
1671                 public override bool Define ()
1672                 {
1673                         if (!base.Define ())
1674                                 return false;
1675
1676                         if (!DefineParameters (parameters))
1677                                 return false;
1678
1679                         if (OptAttributes != null) {
1680                                 Attribute indexer_attr = OptAttributes.Search (Module.PredefinedAttributes.IndexerName);
1681                                 if (indexer_attr != null) {
1682                                         var compiling = indexer_attr.Type.MemberDefinition as TypeContainer;
1683                                         if (compiling != null)
1684                                                 compiling.Define ();
1685
1686                                         if (IsExplicitImpl) {
1687                                                 Report.Error (415, indexer_attr.Location,
1688                                                         "The `{0}' attribute is valid only on an indexer that is not an explicit interface member declaration",
1689                                                         indexer_attr.Type.GetSignatureForError ());
1690                                         } else if ((ModFlags & Modifiers.OVERRIDE) != 0) {
1691                                                 Report.Error (609, indexer_attr.Location,
1692                                                         "Cannot set the `IndexerName' attribute on an indexer marked override");
1693                                         } else {
1694                                                 string name = indexer_attr.GetIndexerAttributeValue ();
1695
1696                                                 if (!string.IsNullOrEmpty (name)) {
1697                                                         SetMemberName (new MemberName (MemberName.Left, name, Location));
1698                                                 }
1699                                         }
1700                                 }
1701                         }
1702
1703                         if (InterfaceType != null) {
1704                                 string base_IndexerName = InterfaceType.MemberDefinition.GetAttributeDefaultMember ();
1705                                 if (base_IndexerName != ShortName) {
1706                                         SetMemberName (new MemberName (MemberName.Left, base_IndexerName, new TypeExpression (InterfaceType, Location), Location));
1707                                 }
1708                         }
1709
1710                         Parent.AddNameToContainer (this, MemberName.Basename);
1711
1712                         flags |= MethodAttributes.HideBySig | MethodAttributes.SpecialName;
1713
1714                         if (!DefineAccessors ())
1715                                 return false;
1716
1717                         if (!CheckBase ())
1718                                 return false;
1719
1720                         DefineBuilders (MemberKind.Indexer, parameters);
1721                         return true;
1722                 }
1723
1724                 public override bool EnableOverloadChecks (MemberCore overload)
1725                 {
1726                         if (overload is Indexer) {
1727                                 caching_flags |= Flags.MethodOverloadsExist;
1728                                 return true;
1729                         }
1730
1731                         return base.EnableOverloadChecks (overload);
1732                 }
1733
1734                 public override void Emit ()
1735                 {
1736                         parameters.CheckConstraints (this);
1737
1738                         base.Emit ();
1739                 }
1740
1741                 public override string GetSignatureForError ()
1742                 {
1743                         StringBuilder sb = new StringBuilder (Parent.GetSignatureForError ());
1744                         if (MemberName.ExplicitInterface != null) {
1745                                 sb.Append (".");
1746                                 sb.Append (MemberName.ExplicitInterface.GetSignatureForError ());
1747                         }
1748
1749                         sb.Append (".this");
1750                         sb.Append (parameters.GetSignatureForError ("[", "]", parameters.Count));
1751                         return sb.ToString ();
1752                 }
1753
1754                 public override string GetSignatureForDocumentation ()
1755                 {
1756                         return base.GetSignatureForDocumentation () + parameters.GetSignatureForDocumentation ();
1757                 }
1758
1759                 public override void PrepareEmit ()
1760                 {
1761                         parameters.ResolveDefaultValues (this);
1762
1763                         base.PrepareEmit ();
1764                 }
1765
1766                 protected override bool VerifyClsCompliance ()
1767                 {
1768                         if (!base.VerifyClsCompliance ())
1769                                 return false;
1770
1771                         parameters.VerifyClsCompliance (this);
1772                         return true;
1773                 }
1774         }
1775
1776         public class IndexerSpec : PropertySpec, IParametersMember
1777         {
1778                 AParametersCollection parameters;
1779
1780                 public IndexerSpec (TypeSpec declaringType, IMemberDefinition definition, TypeSpec memberType, AParametersCollection parameters, PropertyInfo info, Modifiers modifiers)
1781                         : base (MemberKind.Indexer, declaringType, definition, memberType, info, modifiers)
1782                 {
1783                         this.parameters = parameters;
1784                 }
1785
1786                 #region Properties
1787                 public AParametersCollection Parameters {
1788                         get {
1789                                 return parameters;
1790                         }
1791                 }
1792                 #endregion
1793
1794                 public override string GetSignatureForDocumentation ()
1795                 {
1796                         return base.GetSignatureForDocumentation () + parameters.GetSignatureForDocumentation ();
1797                 }
1798
1799                 public override string GetSignatureForError ()
1800                 {
1801                         return DeclaringType.GetSignatureForError () + ".this" + parameters.GetSignatureForError ("[", "]", parameters.Count);
1802                 }
1803
1804                 public override MemberSpec InflateMember (TypeParameterInflator inflator)
1805                 {
1806                         var spec = (IndexerSpec) base.InflateMember (inflator);
1807                         spec.parameters = parameters.Inflate (inflator);
1808                         return spec;
1809                 }
1810
1811                 public override List<MissingTypeSpecReference> ResolveMissingDependencies (MemberSpec caller)
1812                 {
1813                         var missing = base.ResolveMissingDependencies (caller);
1814
1815                         foreach (var pt in parameters.Types) {
1816                                 var m = pt.GetMissingDependencies (caller);
1817                                 if (m == null)
1818                                         continue;
1819
1820                                 if (missing == null)
1821                                         missing = new List<MissingTypeSpecReference> ();
1822
1823                                 missing.AddRange (m);
1824                         }
1825
1826                         return missing;
1827                 }
1828         }
1829 }