mcs/mcs/membercache.cs

   1 //
   2 // membercache.cs: A container for all member lookups
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Marek Safar (marek.safar@gmail.com)
   6 //
   7 // Dual licensed under the terms of the MIT X11 or GNU GPL
   8 //
   9 // Copyright 2001 Ximian, Inc (http://www.ximian.com)
  10 // Copyright 2004-2010 Novell, Inc
  11 //
  12 //
  13
  14 using System;
  15 using System.Collections.Generic;
  16
  17 namespace Mono.CSharp {
  18
  19         [Flags]
  20         public enum MemberKind
  21         {
  22                 Constructor = 1,
  23                 Event = 1 << 1,
  24                 Field = 1 << 2,
  25                 Method = 1 << 3,
  26                 Property = 1 << 4,
  27                 Indexer = 1 << 5,
  28                 Operator = 1 << 6,
  29                 Destructor      = 1 << 7,
  30
  31                 Class           = 1 << 11,
  32                 Struct          = 1 << 12,
  33                 Delegate        = 1 << 13,
  34                 Enum            = 1 << 14,
  35                 Interface       = 1 << 15,
  36                 TypeParameter = 1 << 16,
  37
  38                 ArrayType = 1 << 19,
  39                 PointerType = 1 << 20,
  40                 InternalCompilerType = 1 << 21,
  41
  42                 NestedMask = Class | Struct | Delegate | Enum | Interface,
  43                 GenericMask = Method | Class | Struct | Delegate | Interface,
  44                 MaskType = Constructor | Event | Field | Method | Property | Indexer | Operator | Destructor | NestedMask,
  45                 All = MaskType
  46         }
  47
  48         [Flags]
  49         public enum BindingRestriction
  50         {
  51                 None = 0,
  52
  53                 // Inspect only queried type members
  54                 DeclaredOnly = 1 << 1,
  55
  56                 // Exclude static
  57                 InstanceOnly = 1 << 2,
  58
  59                 NoAccessors = 1 << 3,
  60
  61                 // Member has to be override
  62                 OverrideOnly = 1 << 4
  63         }
  64
  65         public struct MemberFilter : IEquatable<MemberSpec>
  66         {
  67                 public readonly string Name;
  68                 public readonly MemberKind Kind;
  69                 public readonly AParametersCollection Parameters;
  70                 public readonly TypeSpec MemberType;
  71
  72                 int arity; // -1 to ignore the check
  73
  74                 private MemberFilter (string name, MemberKind kind)
  75                 {
  76                         Name = name;
  77                         Kind = kind;
  78                         Parameters = null;
  79                         MemberType = null;
  80                         arity = -1;
  81                 }
  82
  83                 public MemberFilter (MethodSpec m)
  84                 {
  85                         Name = m.Name;
  86                         Kind = MemberKind.Method;
  87                         Parameters = m.Parameters;
  88                         MemberType = m.ReturnType;
  89                         arity = m.Arity;
  90                 }
  91
  92                 public MemberFilter (string name, int arity, MemberKind kind, AParametersCollection param, TypeSpec type)
  93                 {
  94                         Name = name;
  95                         Kind = kind;
  96                         Parameters = param;
  97                         MemberType = type;
  98                         this.arity = arity;
  99                 }
 100
 101                 public static MemberFilter Constructor (AParametersCollection param)
 102                 {
 103                         return new MemberFilter (Mono.CSharp.Constructor.ConstructorName, 0, MemberKind.Constructor, param, null);
 104                 }
 105
 106                 public static MemberFilter Property (string name, TypeSpec type)
 107                 {
 108                         return new MemberFilter (name, 0, MemberKind.Property, null, type);
 109                 }
 110
 111                 public static MemberFilter Field (string name, TypeSpec type)
 112                 {
 113                         return new MemberFilter (name, 0, MemberKind.Field, null, type);
 114                 }
 115
 116                 public static MemberFilter Method (string name, int arity, AParametersCollection param, TypeSpec type)
 117                 {
 118                         return new MemberFilter (name, arity, MemberKind.Method, param, type);
 119                 }
 120
 121                 #region IEquatable<MemberSpec> Members
 122
 123                 public bool Equals (MemberSpec other)
 124                 {
 125                         // Is the member of the correct type ?
 126                         // TODO: Isn't this redundant ?
 127                         if ((other.Kind & Kind & MemberKind.MaskType) == 0)
 128                                 return false;
 129
 130                         // Check arity when not disabled
 131                         if (arity >= 0 && arity != other.Arity)
 132                                 return false;
 133
 134                         if (Parameters != null) {
 135                                 if (other is IParametersMember) {
 136                                         var other_param = ((IParametersMember) other).Parameters;
 137                                         if (!TypeSpecComparer.Override.IsEqual (Parameters, other_param))
 138                                                 return false;
 139                                 } else {
 140                                         return false;
 141                                 }
 142                         }
 143
 144                         if (MemberType != null) {
 145                                 if (other is IInterfaceMemberSpec) {
 146                                         var other_type = ((IInterfaceMemberSpec) other).MemberType;
 147                                         if (!TypeSpecComparer.Override.IsEqual (other_type, MemberType))
 148                                                 return false;
 149                                 } else {
 150                                         return false;
 151                                 }
 152                         }
 153
 154                         return true;
 155                 }
 156
 157                 #endregion
 158         }
 159
 160         //
 161         // The MemberCache is the main members container used by compiler. It contains
 162         // all members imported or defined during compilation using on demand filling
 163         // process. Inflated containers are also using MemberCache to make inflated
 164         // members look like normal definition.
 165         //
 166         // All of the methods are performance and memory sensitive as the MemberCache
 167         // is the underlying engine of all member based operations.
 168         //
 169         public class MemberCache
 170         {
 171                 enum StateFlags
 172                 {
 173                         HasConversionOperator = 1 << 1,
 174                         HasUserOperator = 1 << 2
 175                 }
 176
 177                 readonly Dictionary<string, IList<MemberSpec>> member_hash;
 178                 Dictionary<string, MemberSpec[]> locase_members;
 179                 IList<MethodSpec> missing_abstract;
 180                 StateFlags state;
 181
 182                 public static readonly string IndexerNameAlias = "<this>";
 183
 184                 public static readonly MemberCache Empty = new MemberCache (0);
 185
 186                 public MemberCache ()
 187                         : this (16)
 188                 {
 189                 }
 190
 191                 public MemberCache (int capacity)
 192                 {
 193                         member_hash = new Dictionary<string, IList<MemberSpec>> (capacity);
 194                 }
 195
 196                 public MemberCache (MemberCache cache)
 197                         : this (cache.member_hash.Count)
 198                 {
 199                         this.state = cache.state;
 200                 }
 201
 202                 //
 203                 // Creates a new MemberCache for the given `container'.
 204                 //
 205                 public MemberCache (TypeContainer container)
 206                         : this ()                               // TODO: Optimize the size
 207                 {
 208                 }
 209
 210                 //
 211                 // Member-cache does not contain base members but it does
 212                 // contain all base interface members, so the Lookup code
 213                 // can use simple inheritance rules.
 214                 //
 215                 public void AddInterface (TypeSpec iface)
 216                 {
 217                         var cache = iface.MemberCache;
 218
 219                         IList<MemberSpec> list;
 220                         foreach (var entry in cache.member_hash) {
 221                                 if (!member_hash.TryGetValue (entry.Key, out list)) {
 222                                         if (entry.Value.Count == 1) {
 223                                                 list = entry.Value;
 224                                         } else {
 225                                                 list = new List<MemberSpec> (entry.Value);
 226                                         }
 227
 228                                         member_hash.Add (entry.Key, list);
 229                                         continue;
 230                                 }
 231
 232                                 foreach (var ce in entry.Value) {
 233                                         if (list.Contains (ce))
 234                                                 continue;
 235
 236                                         if (AddInterfaceMember (ce, ref list))
 237                                                 member_hash[entry.Key] = list;
 238                                 }
 239                         }
 240
 241                         // Add also all base interfaces
 242                         if (iface.Interfaces != null) {
 243                                 foreach (var base_iface in iface.Interfaces)
 244                                         AddInterface (base_iface);
 245                         }
 246                 }
 247
 248                 public void AddMember (InterfaceMemberBase imb, string exlicitName, MemberSpec ms)
 249                 {
 250                         // Explicit names cannot be looked-up but can be used for
 251                         // collision checking (no name mangling needed)
 252                         if (imb.IsExplicitImpl)
 253                                 AddMember (exlicitName, ms);
 254                         else
 255                                 AddMember (ms);
 256                 }
 257
 258                 //
 259                 // Add non-explicit member to member cache
 260                 //
 261                 public void AddMember (MemberSpec ms)
 262                 {
 263                         AddMember (GetLookupName (ms), ms);
 264                 }
 265
 266                 void AddMember (string name, MemberSpec member)
 267                 {
 268                         if (member.Kind == MemberKind.Operator) {
 269                                 var dt = member.DeclaringType;
 270                                 if (dt == TypeManager.string_type || dt == TypeManager.delegate_type || dt == TypeManager.multicast_delegate_type) {
 271                                         // Some core types have user operators but they cannot be used as normal
 272                                         // user operators as they are predefined and therefore having different
 273                                         // rules (e.g. binary operators) by not setting the flag we hide them for
 274                                         // user conversions
 275                                         // TODO: Should I do this for all core types ?
 276                                 } else if (name == Operator.GetMetadataName (Operator.OpType.Implicit) || name == Operator.GetMetadataName (Operator.OpType.Explicit)) {
 277                                         state |= StateFlags.HasConversionOperator;
 278                                 } else {
 279                                         state |= StateFlags.HasUserOperator;
 280                                 }
 281                         }
 282
 283                         IList<MemberSpec> list;
 284                         if (!member_hash.TryGetValue (name, out list)) {
 285                                 member_hash.Add (name, new MemberSpec[] { member });
 286                                 return;
 287                         }
 288
 289                         if (member.DeclaringType.IsInterface) {
 290                                 if (AddInterfaceMember (member, ref list))
 291                                         member_hash[name] = list;
 292                         } else {
 293                                 if (list is MemberSpec[]) {
 294                                         list = new List<MemberSpec> () { list[0] };
 295                                         member_hash[name] = list;
 296                                 }
 297
 298                                 list.Add (member);
 299                         }
 300                 }
 301
 302                 //
 303                 // Ignores any base interface member which can be hidden
 304                 // by this interface
 305                 //
 306                 static bool AddInterfaceMember (MemberSpec member, ref IList<MemberSpec> existing)
 307                 {
 308                         var member_param = member is IParametersMember ? ((IParametersMember) member).Parameters : ParametersCompiled.EmptyReadOnlyParameters;
 309
 310                         //
 311                         // interface IA : IB { int Prop { set; } }
 312                         // interface IB { bool Prop { get; } }
 313                         //
 314                         // IB.Prop is never accessible from IA interface
 315                         //
 316                         for (int i = 0; i < existing.Count; ++i) {
 317                                 var entry = existing[i];
 318
 319                                 if (entry.Arity != member.Arity)
 320                                         continue;
 321
 322                                 if (entry is IParametersMember) {
 323                                         var entry_param = ((IParametersMember) entry).Parameters;
 324                                         if (!TypeSpecComparer.Override.IsEqual (entry_param, member_param))
 325                                                 continue;
 326                                 }
 327
 328                                 if (member.DeclaringType.ImplementsInterface (entry.DeclaringType, false)) {
 329                                         if (existing is MemberSpec[]) {
 330                                                 existing = new MemberSpec[] { member };
 331                                                 return true;
 332                                         }
 333
 334                                         existing.RemoveAt (i--);
 335                                         continue;
 336                                 }
 337
 338                                 if ((entry.DeclaringType == member.DeclaringType && entry.IsAccessor == member.IsAccessor) ||
 339                                         entry.DeclaringType.ImplementsInterface (member.DeclaringType, false))
 340                                         return false;
 341                         }
 342
 343                         if (existing is MemberSpec[]) {
 344                                 existing = new List<MemberSpec> () { existing[0], member };
 345                                 return true;
 346                         }
 347
 348                         existing.Add (member);
 349                         return false;
 350                 }
 351
 352                 public static MemberSpec FindMember (TypeSpec container, MemberFilter filter, BindingRestriction restrictions)
 353                 {
 354                         do {
 355                                 IList<MemberSpec> applicable;
 356                                 if (container.MemberCache.member_hash.TryGetValue (filter.Name, out applicable)) {
 357                                         // Start from the end because interface members are in reverse order
 358                                         for (int i = applicable.Count - 1; i >= 0; i--) {
 359                                                 var entry = applicable [i];
 360
 361                                                 if ((restrictions & BindingRestriction.InstanceOnly) != 0 && entry.IsStatic)
 362                                                         continue;
 363
 364                                                 if ((restrictions & BindingRestriction.NoAccessors) != 0 && entry.IsAccessor)
 365                                                         continue;
 366
 367                                                 if ((restrictions & BindingRestriction.OverrideOnly) != 0 && (entry.Modifiers & Modifiers.OVERRIDE) == 0)
 368                                                         continue;
 369
 370                                                 if (!filter.Equals (entry))
 371                                                         continue;
 372
 373                                                 if ((restrictions & BindingRestriction.DeclaredOnly) != 0 && container.IsInterface && entry.DeclaringType != container)
 374                                                         continue;
 375
 376                                                 return entry;
 377                                         }
 378                                 }
 379
 380                                 if ((restrictions & BindingRestriction.DeclaredOnly) != 0)
 381                                         break;
 382
 383                                 container = container.BaseType;
 384                         } while (container != null);
 385
 386                         return null;
 387                 }
 388
 389                 //
 390                 // A special method to work with member lookup only. It returns a list of all members named @name
 391                 // starting from @container. It's very performance sensitive
 392                 //
 393                 public static IList<MemberSpec> FindMembers (TypeSpec container, string name, bool declaredOnly)
 394                 {
 395                         IList<MemberSpec> applicable;
 396
 397                         do {
 398                                 if (container.MemberCache.member_hash.TryGetValue (name, out applicable) || declaredOnly)
 399                                         return applicable;
 400
 401                                 container = container.BaseType;
 402                         } while (container != null);
 403
 404                         return null;
 405                 }
 406
 407                 //
 408                 // Finds the nested type in container
 409                 //
 410                 public static TypeSpec FindNestedType (TypeSpec container, string name, int arity)
 411                 {
 412                         IList<MemberSpec> applicable;
 413                         TypeSpec best_match = null;
 414                         do {
 415                                 // TODO: Don't know how to handle this yet
 416                                 // When resolving base type of nested type, parent type must have
 417                                 // base type resolved to scan full hierarchy correctly
 418                                 // Similarly MemberCacheTypes will inflate BaseType and Interfaces
 419                                 // based on type definition
 420                                 var tc = container.MemberDefinition as TypeContainer;
 421                                 if (tc != null)
 422                                         tc.DefineType ();
 423
 424                                 if (container.MemberCacheTypes.member_hash.TryGetValue (name, out applicable)) {
 425                                         for (int i = applicable.Count - 1; i >= 0; i--) {
 426                                                 var entry = applicable[i];
 427                                                 if ((entry.Kind & MemberKind.NestedMask) == 0)
 428                                                         continue;
 429
 430                                                 var ts = (TypeSpec) entry;
 431                                                 if (arity == ts.Arity)
 432                                                         return ts;
 433
 434                                                 if (arity < 0) {
 435                                                         if (best_match == null) {
 436                                                                 best_match = ts;
 437                                                         } else if (System.Math.Abs (ts.Arity + arity) < System.Math.Abs (ts.Arity + arity)) {
 438                                                                 best_match = ts;
 439                                                         }
 440                                                 }
 441                                         }
 442                                 }
 443
 444                                 container = container.BaseType;
 445                         } while (container != null);
 446
 447                         return best_match;
 448                 }
 449
 450                 //
 451                 // Looks for extension methods with defined name and extension type
 452                 //
 453                 public List<MethodSpec> FindExtensionMethods (TypeContainer invocationType, TypeSpec extensionType, string name, int arity)
 454                 {
 455                         IList<MemberSpec> entries;
 456                         if (!member_hash.TryGetValue (name, out entries))
 457                                 return null;
 458
 459                         List<MethodSpec> candidates = null;
 460                         foreach (var entry in entries) {
 461                                 if (entry.Kind != MemberKind.Method || (arity > 0 && entry.Arity != arity))
 462                                         continue;
 463
 464                                 var ms = (MethodSpec) entry;
 465                                 if (!ms.IsExtensionMethod)
 466                                         continue;
 467
 468                                 if (!ms.IsAccessible (invocationType.CurrentType))
 469                                         continue;
 470
 471                                 if ((ms.DeclaringType.Modifiers & Modifiers.INTERNAL) != 0 && !ms.DeclaringType.MemberDefinition.IsInternalAsPublic (invocationType.DeclaringAssembly))
 472                                         continue;
 473
 474                                 if (candidates == null)
 475                                         candidates = new List<MethodSpec> ();
 476                                 candidates.Add (ms);
 477                         }
 478
 479                         return candidates;
 480                 }
 481
 482                 //
 483                 // Returns base members of @member member if no exact match is found @bestCandidate returns
 484                 // the best match
 485                 //
 486                 public static MemberSpec FindBaseMember (MemberCore member, out MemberSpec bestCandidate)
 487                 {
 488                         bestCandidate = null;
 489                         var container = member.Parent.PartialContainer.Definition;
 490                         if (!container.IsInterface) {
 491                                 container = container.BaseType;
 492
 493                                 // It can happen for a user definition of System.Object
 494                                 if (container == null)
 495                                         return null;
 496                         }
 497
 498                         string name = GetLookupName (member);
 499                         IList<MemberSpec> applicable;
 500                         var member_param = member is IParametersMember ? ((IParametersMember) member).Parameters : null;
 501
 502                         var mkind = GetMemberCoreKind (member);
 503                         bool member_with_accessors = mkind == MemberKind.Indexer || mkind == MemberKind.Property;
 504
 505                         do {
 506                                 if (container.MemberCache.member_hash.TryGetValue (name, out applicable)) {
 507                                         for (int i = 0; i < applicable.Count; ++i) {
 508                                                 var entry = applicable [i];
 509
 510                                                 if ((entry.Modifiers & Modifiers.PRIVATE) != 0)
 511                                                         continue;
 512
 513                                                 if ((entry.Modifiers & Modifiers.AccessibilityMask) == Modifiers.INTERNAL &&
 514                                                         !entry.DeclaringType.MemberDefinition.IsInternalAsPublic (member.Module.DeclaringAssembly))
 515                                                         continue;
 516
 517                                                 //
 518                                                 // Is the member of same type ?
 519                                                 //
 520                                                 if ((entry.Kind & ~MemberKind.Destructor & mkind & MemberKind.MaskType) == 0) {
 521                                                         // Destructors are ignored as they cannot be overridden by user
 522                                                         if ((entry.Kind & MemberKind.Destructor) != 0)
 523                                                                 continue;
 524
 525                                                         // Only different arity methods hide
 526                                                         if (mkind != MemberKind.Method && member.MemberName.Arity != entry.Arity)
 527                                                                 continue;
 528
 529                                                         if ((member_param == null || !(entry is IParametersMember))) {
 530                                                                 bestCandidate = entry;
 531                                                                 return null;
 532                                                         }
 533
 534                                                         continue;
 535                                                 }
 536
 537                                                 if (entry.Kind != mkind) {
 538                                                         if (bestCandidate == null)
 539                                                                 bestCandidate = entry;
 540
 541                                                         continue;
 542                                                 }
 543
 544                                                 if (member_param != null) {
 545                                                         // Check arity match
 546                                                         int arity = member.MemberName.Arity;
 547                                                         if (arity != entry.Arity)
 548                                                                 continue;
 549
 550                                                         var pm = entry as IParametersMember;
 551                                                         AParametersCollection entry_parameters;
 552                                                         if (pm == null) {
 553                                                                 if (entry.Kind != MemberKind.Delegate)
 554                                                                         continue;
 555
 556                                                                 // TODO: I don't have DelegateSpec
 557                                                                 entry_parameters = Delegate.GetParameters (member.Compiler, (TypeSpec) entry);
 558                                                         } else {
 559                                                                 entry_parameters = pm.Parameters;
 560                                                         }
 561
 562                                                         if (entry.IsAccessor != member is AbstractPropertyEventMethod)
 563                                                                 continue;
 564
 565                                                         if (!TypeSpecComparer.Override.IsEqual (entry_parameters, member_param))
 566                                                                 continue;
 567                                                 }
 568
 569                                                 //
 570                                                 // Skip override members with accessors they may not fully implement the base member
 571                                                 //
 572                                                 if (member_with_accessors) {
 573                                                         if ((entry.Modifiers & (Modifiers.OVERRIDE | Modifiers.SEALED)) == Modifiers.OVERRIDE) {
 574                                                                 //
 575                                                                 // Set candidate to member override to flag we found an implementation
 576                                                                 //
 577                                                                 bestCandidate = entry;
 578                                                                 continue;
 579                                                         }
 580                                                 } else {
 581                                                         bestCandidate = null;
 582                                                 }
 583
 584                                                 return entry;
 585                                         }
 586                                 }
 587
 588                                 if (container.IsInterface)
 589                                         break;
 590
 591                                 container = container.BaseType;
 592                         } while (container != null);
 593
 594                         return null;
 595                 }
 596
 597                 //
 598                 // Returns inflated version of MemberSpec, it works similarly to
 599                 // SRE TypeBuilder.GetMethod
 600                 //
 601                 public static T GetMember<T> (TypeSpec container, T spec) where T : MemberSpec
 602                 {
 603                         IList<MemberSpec> applicable;
 604                         if (container.MemberCache.member_hash.TryGetValue (GetLookupName (spec), out applicable)) {
 605                                 for (int i = applicable.Count - 1; i >= 0; i--) {
 606                                         var entry = applicable[i];
 607                                         if (entry.MemberDefinition == spec.MemberDefinition)
 608                                                 return (T) entry;
 609                                 }
 610                         }
 611
 612                         throw new InternalErrorException ("Missing member `{0}' on inflated type `{1}'",
 613                                 spec.GetSignatureForError (), container.GetSignatureForError ());
 614                 }
 615
 616                 static MemberKind GetMemberCoreKind (MemberCore member)
 617                 {
 618                         if (member is FieldBase)
 619                                 return MemberKind.Field;
 620                         if (member is Indexer)
 621                                 return MemberKind.Indexer;
 622                         if (member is Class)
 623                                 return MemberKind.Class;
 624                         if (member is Struct)
 625                                 return MemberKind.Struct;
 626                         if (member is Destructor)
 627                                 return MemberKind.Destructor;
 628                         if (member is Method)
 629                                 return MemberKind.Method;
 630                         if (member is Property)
 631                                 return MemberKind.Property;
 632                         if (member is EventField)
 633                                 return MemberKind.Event;
 634                         if (member is Interface)
 635                                 return MemberKind.Interface;
 636                         if (member is EventProperty)
 637                                 return MemberKind.Event;
 638                         if (member is Delegate)
 639                                 return MemberKind.Delegate;
 640                         if (member is Enum)
 641                                 return MemberKind.Enum;
 642
 643                         throw new NotImplementedException (member.GetType ().ToString ());
 644                 }
 645
 646                 public static IList<MemberSpec> GetCompletitionMembers (TypeSpec container, string name)
 647                 {
 648                         var matches = new List<MemberSpec> ();
 649                         foreach (var entry in container.MemberCache.member_hash) {
 650                                 foreach (var name_entry in entry.Value) {
 651                                         if (name_entry.IsAccessor)
 652                                                 continue;
 653
 654                                         if ((name_entry.Kind & (MemberKind.Constructor | MemberKind.Destructor | MemberKind.Operator)) != 0)
 655                                                 continue;
 656
 657                                         if (!name_entry.IsAccessible (InternalType.FakeInternalType))
 658                                                 continue;
 659
 660                                         if (name == null || name_entry.Name.StartsWith (name)) {
 661                                                 matches.Add (name_entry);
 662                                         }
 663                                 }
 664                         }
 665
 666                         return matches;
 667                 }
 668
 669                 //
 670                 // Returns members of @iface only, base members are ignored
 671                 //
 672                 public static IList<MethodSpec> GetInterfaceMethods (TypeSpec iface)
 673                 {
 674                         //
 675                         // MemberCache flatten interfaces, therefore in cases like this one
 676                         //
 677                         // interface IA : IB {}
 678                         // interface IB { void Foo () }
 679                         //
 680                         // we would return Foo inside IA which is not expected in this case
 681                         //
 682                         var methods = new List<MethodSpec> ();
 683                         foreach (var entry in iface.MemberCache.member_hash.Values) {
 684                                 foreach (var name_entry in entry) {
 685                                         if (iface == name_entry.DeclaringType) {
 686                                                 if (name_entry.Kind == MemberKind.Method) {
 687                                                         methods.Add ((MethodSpec) name_entry);
 688                                                 }
 689                                         }
 690                                 }
 691                         }
 692
 693                         return methods;
 694                 }
 695
 696                 //
 697                 // Returns all not implememted abstract members inside abstract type
 698                 // NOTE: Returned list is shared and must not be modified
 699                 //
 700                 public static IList<MethodSpec> GetNotImplementedAbstractMethods (TypeSpec type)
 701                 {
 702                         if (type.MemberCache.missing_abstract != null)
 703                                 return type.MemberCache.missing_abstract;
 704
 705                         var abstract_methods = new List<MethodSpec> ();
 706                         List<TypeSpec> hierarchy = null;
 707
 708                         //
 709                         // Stage 1: top-to-bottom scan for abstract members
 710                         //
 711                         var abstract_type = type;
 712                         while (true) {
 713                                 foreach (var entry in abstract_type.MemberCache.member_hash) {
 714                                         foreach (var name_entry in entry.Value) {
 715                                                 if ((name_entry.Modifiers & Modifiers.ABSTRACT) == 0)
 716                                                         continue;
 717
 718                                                 if (name_entry.Kind != MemberKind.Method)
 719                                                         continue;
 720
 721                                                 abstract_methods.Add ((MethodSpec) name_entry);
 722                                         }
 723                                 }
 724
 725                                 var base_type = abstract_type.BaseType;
 726                                 if (!base_type.IsAbstract)
 727                                         break;
 728
 729                                 if (hierarchy == null)
 730                                         hierarchy = new List<TypeSpec> ();
 731
 732                                 hierarchy.Add (abstract_type);
 733                                 abstract_type = base_type;
 734                         }
 735
 736                         int not_implemented_count = abstract_methods.Count;
 737                         if (not_implemented_count == 0 || hierarchy == null) {
 738                                 type.MemberCache.missing_abstract = abstract_methods;
 739                                 return type.MemberCache.missing_abstract;
 740                         }
 741
 742                         //
 743                         // Stage 2: Remove already implemented methods
 744                         //
 745                         foreach (var type_up in hierarchy) {
 746                                 var members = type_up.MemberCache.member_hash;
 747                                 if (members.Count == 0)
 748                                         continue;
 749
 750                                 for (int i = 0; i < abstract_methods.Count; ++i) {
 751                                         var candidate = abstract_methods [i];
 752                                         if (candidate == null)
 753                                                 continue;
 754
 755                                         IList<MemberSpec> applicable;
 756                                         if (!members.TryGetValue (candidate.Name, out applicable))
 757                                                 continue;
 758
 759                                         var filter = new MemberFilter (candidate);
 760                                         foreach (var item in applicable) {
 761                                                 if ((item.Modifiers & (Modifiers.OVERRIDE | Modifiers.VIRTUAL)) == 0)
 762                                                         continue;
 763
 764                                                 if (filter.Equals (item)) {
 765                                                         --not_implemented_count;
 766                                                         abstract_methods [i] = null;
 767                                                         break;
 768                                                 }
 769                                         }
 770                                 }
 771                         }
 772
 773                         if (not_implemented_count == abstract_methods.Count) {
 774                                 type.MemberCache.missing_abstract = abstract_methods;
 775                                 return type.MemberCache.missing_abstract;
 776                         }
 777
 778                         var not_implemented = new MethodSpec[not_implemented_count];
 779                         int counter = 0;
 780                         foreach (var m in abstract_methods) {
 781                                 if (m == null)
 782                                         continue;
 783
 784                                 not_implemented[counter++] = m;
 785                         }
 786
 787                         type.MemberCache.missing_abstract = not_implemented;
 788                         return type.MemberCache.missing_abstract;
 789                 }
 790
 791                 static string GetLookupName (MemberSpec ms)
 792                 {
 793                         if (ms.Kind == MemberKind.Indexer)
 794                                 return IndexerNameAlias;
 795
 796                         if (ms.Kind == MemberKind.Constructor) {
 797                                 if (ms.IsStatic)
 798                                         return Constructor.TypeConstructorName;
 799
 800                                 return Constructor.ConstructorName;
 801                         }
 802
 803                         return ms.Name;
 804                 }
 805
 806                 static string GetLookupName (MemberCore mc)
 807                 {
 808                         if (mc is Indexer)
 809                                 return IndexerNameAlias;
 810
 811                         if (mc is Constructor)
 812                                 return Constructor.ConstructorName;
 813
 814                         return mc.MemberName.Name;
 815                 }
 816
 817                 //
 818                 // Returns all operators declared on container and its base types (until declaredOnly is used)
 819                 //
 820                 public static IList<MemberSpec> GetUserOperator (TypeSpec container, Operator.OpType op, bool declaredOnly)
 821                 {
 822                         IList<MemberSpec> found = null;
 823
 824                         IList<MemberSpec> applicable;
 825                         do {
 826                                 var mc = container.MemberCache;
 827
 828                                 if (((op == Operator.OpType.Implicit || op == Operator.OpType.Explicit) && (mc.state & StateFlags.HasConversionOperator) != 0) ||
 829                                          (mc.state & StateFlags.HasUserOperator) != 0) {
 830
 831                                         if (mc.member_hash.TryGetValue (Operator.GetMetadataName (op), out applicable)) {
 832                                                 int i;
 833                                                 for (i = 0; i < applicable.Count; ++i) {
 834                                                         if (applicable[i].Kind != MemberKind.Operator) {
 835                                                                 break;
 836                                                         }
 837                                                 }
 838
 839                                                 //
 840                                                 // Handles very rare case where a method with same name as operator (op_xxxx) exists
 841                                                 // and we have to resize the applicable list
 842                                                 //
 843                                                 if (i != applicable.Count) {
 844                                                         for (i = 0; i < applicable.Count; ++i) {
 845                                                                 if (applicable[i].Kind != MemberKind.Operator) {
 846                                                                         continue;
 847                                                                 }
 848
 849                                                                 if (found == null) {
 850                                                                         found = new List<MemberSpec> ();
 851                                                                         found.Add (applicable[i]);
 852                                                                 } else {
 853                                                                         var prev = found as List<MemberSpec>;
 854                                                                         if (prev == null) {
 855                                                                                 prev = new List<MemberSpec> (found.Count + 1);
 856                                                                                 prev.AddRange (found);
 857                                                                         }
 858
 859                                                                         prev.Add (applicable[i]);
 860                                                                 }
 861                                                         }
 862                                                 } else {
 863                                                         if (found == null) {
 864                                                                 found = applicable;
 865                                                         } else {
 866                                                                 var merged = found as List<MemberSpec>;
 867                                                                 if (merged == null) {
 868                                                                         merged = new List<MemberSpec> (found.Count + applicable.Count);
 869                                                                         merged.AddRange (found);
 870                                                                         found = merged;
 871                                                                 }
 872
 873                                                                 merged.AddRange (applicable);
 874                                                         }
 875                                                 }
 876                                         }
 877                                 }
 878
 879                                 // BaseType call can be expensive
 880                                 if (declaredOnly)
 881                                         break;
 882
 883                                 container = container.BaseType;
 884                         } while (container != null);
 885
 886                         return found;
 887                 }
 888
 889                 //
 890                 // Inflates all member cache nested types
 891                 //
 892                 public void InflateTypes (MemberCache inflated_cache, TypeParameterInflator inflator)
 893                 {
 894                         foreach (var item in member_hash) {
 895                                 IList<MemberSpec> inflated_members = null;
 896                                 for (int i = 0; i < item.Value.Count; ++i ) {
 897                                         var member = item.Value[i];
 898
 899                                         // FIXME: When inflating members refering nested types before they are inflated
 900                                         if (member == null)
 901                                                 continue;
 902
 903                                         if ((member.Kind & MemberKind.NestedMask) != 0 &&
 904                                                 (member.Modifiers & Modifiers.COMPILER_GENERATED) == 0) {
 905                                                 if (inflated_members == null) {
 906                                                         inflated_members = new MemberSpec[item.Value.Count];
 907                                                         inflated_cache.member_hash.Add (item.Key, inflated_members);
 908                                                 }
 909
 910                                                 inflated_members [i] = member.InflateMember (inflator);
 911                                         }
 912                                 }
 913                         }
 914                 }
 915
 916                 //
 917                 // Inflates all open type members, requires InflateTypes to be called before
 918                 //
 919                 public void InflateMembers (MemberCache cacheToInflate, TypeSpec inflatedType, TypeParameterInflator inflator)
 920                 {
 921                         var inflated_member_hash = cacheToInflate.member_hash;
 922                         Dictionary<MemberSpec, MethodSpec> accessor_relation = null;
 923                         List<MemberSpec> accessor_members = null;
 924
 925                         // Copy member specific flags when all members were added
 926                         cacheToInflate.state = state;
 927
 928                         foreach (var item in member_hash) {
 929                                 var members = item.Value;
 930                                 IList<MemberSpec> inflated_members = null;
 931                                 for (int i = 0; i < members.Count; ++i ) {
 932                                         var member = members[i];
 933
 934                                         //
 935                                         // All nested types have been inflated earlier except for
 936                                         // compiler types which are created later and could miss InflateTypes
 937                                         //
 938                                         if ((member.Kind & MemberKind.NestedMask) != 0 &&
 939                                                 (member.Modifiers & Modifiers.COMPILER_GENERATED) == 0) {
 940                                                 if (inflated_members == null)
 941                                                         inflated_members = inflated_member_hash[item.Key];
 942
 943                                                 continue;
 944                                         }
 945
 946                                         //
 947                                         // Clone the container first
 948                                         //
 949                                         if (inflated_members == null) {
 950                                                 inflated_members = new MemberSpec [item.Value.Count];
 951                                                 inflated_member_hash.Add (item.Key, inflated_members);
 952                                         }
 953
 954                                         var local_inflator = inflator;
 955
 956                                         if (member.DeclaringType != inflatedType) {
 957                                                 //
 958                                                 // Don't inflate top-level non-generic interface members
 959                                                 // merged into generic interface
 960                                                 //
 961                                                 if (!member.DeclaringType.IsGeneric && !member.DeclaringType.IsNested) {
 962                                                         inflated_members [i] = member;
 963                                                         continue;
 964                                                 }
 965
 966                                                 //
 967                                                 // Needed when inflating flatten interfaces. It inflates
 968                                                 // container type only, type parameters are already done
 969                                                 //
 970                                                 // Handles cases like:
 971                                                 //
 972                                                 // interface I<T> {}
 973                                                 // interface I<U, V> : I<U> {}
 974                                                 //
 975                                                 // class C: I<int, bool> {}
 976                                                 //
 977                                                 var inflated_parent = inflator.Inflate (member.DeclaringType);
 978                                                 if (inflated_parent != inflator.TypeInstance)
 979                                                         local_inflator = new TypeParameterInflator (inflator, inflated_parent);
 980                                         }
 981
 982                                         //
 983                                         // Inflate every member, its parent is now different
 984                                         //
 985                                         var inflated = member.InflateMember (local_inflator);
 986                                         inflated_members [i] = inflated;
 987
 988                                         if (member is PropertySpec || member is EventSpec) {
 989                                                 if (accessor_members == null)
 990                                                         accessor_members = new List<MemberSpec> ();
 991
 992                                                 accessor_members.Add (inflated);
 993                                                 continue;
 994                                         }
 995
 996                                         if (member.IsAccessor) {
 997                                                 if (accessor_relation == null)
 998                                                         accessor_relation = new Dictionary<MemberSpec, MethodSpec> ();
 999                                                 accessor_relation.Add (member, (MethodSpec) inflated);
1000                                         }
1001                                 }
1002                         }
1003
1004                         if (accessor_members != null) {
1005                                 foreach (var member in accessor_members) {
1006                                         var prop = member as PropertySpec;
1007                                         if (prop != null) {
1008                                                 if (prop.Get != null)
1009                                                         prop.Get = accessor_relation[prop.Get];
1010                                                 if (prop.Set != null)
1011                                                         prop.Set = accessor_relation[prop.Set];
1012
1013                                                 continue;
1014                                         }
1015
1016                                         var ev = (EventSpec) member;
1017                                         ev.AccessorAdd = accessor_relation[ev.AccessorAdd];
1018                                         ev.AccessorRemove = accessor_relation[ev.AccessorRemove];
1019                                 }
1020                         }
1021                 }
1022
1023                 //
1024                 // Checks all appropriate container members for CLS compliance
1025                 //
1026                 public void VerifyClsCompliance (TypeSpec container, Report report)
1027                 {
1028                         if (locase_members != null)
1029                                 return;
1030
1031                         if (container.BaseType == null) {
1032                                 locase_members = new Dictionary<string, MemberSpec[]> (member_hash.Count); // StringComparer.OrdinalIgnoreCase);
1033                         } else {
1034                                 container.BaseType.MemberCache.VerifyClsCompliance (container.BaseType, report);
1035                                 locase_members = new Dictionary<string, MemberSpec[]> (container.BaseType.MemberCache.locase_members); //, StringComparer.OrdinalIgnoreCase);
1036                         }
1037
1038                         var is_imported_type = container.MemberDefinition.IsImported;
1039                         foreach (var entry in container.MemberCache.member_hash) {
1040                                 for (int i = 0; i < entry.Value.Count; ++i ) {
1041                                         var name_entry = entry.Value[i];
1042                                         if ((name_entry.Modifiers & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
1043                                                 continue;
1044
1045                                         if ((name_entry.Modifiers & (Modifiers.OVERRIDE | Modifiers.COMPILER_GENERATED)) != 0)
1046                                                 continue;
1047
1048                                         if ((name_entry.Kind & MemberKind.MaskType) == 0)
1049                                                 continue;
1050
1051                                         if (name_entry.MemberDefinition.IsNotCLSCompliant ())
1052                                             continue;
1053
1054                                         IParametersMember p_a = name_entry as IParametersMember;
1055                                         if (p_a != null && !name_entry.IsAccessor) {
1056                                                 if (!is_imported_type) {
1057                                                         var p_a_pd = p_a.Parameters;
1058                                                         for (int ii = i + 1; ii < entry.Value.Count; ++ii) {
1059                                                                 var checked_entry = entry.Value[ii];
1060                                                                 IParametersMember p_b = checked_entry as IParametersMember;
1061                                                                 if (p_b == null)
1062                                                                         continue;
1063
1064                                                                 if (p_a_pd.Count != p_b.Parameters.Count)
1065                                                                         continue;
1066
1067                                                                 if (checked_entry.IsAccessor)
1068                                                                         continue;
1069
1070                                                                 var res = ParametersCompiled.IsSameClsSignature (p_a.Parameters, p_b.Parameters);
1071                                                                 if (res != 0) {
1072                                                                         var last = GetLaterDefinedMember (checked_entry, name_entry);
1073                                                                         if (last == checked_entry.MemberDefinition) {
1074                                                                                 report.SymbolRelatedToPreviousError (name_entry);
1075                                                                         } else {
1076                                                                                 report.SymbolRelatedToPreviousError (checked_entry);
1077                                                                         }
1078
1079                                                                         if ((res & 1) != 0) {
1080                                                                                 report.Warning (3006, 1, last.Location,
1081                                                                                                 "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant",
1082                                                                                                 name_entry.GetSignatureForError ());
1083                                                                         }
1084
1085                                                                         if ((res & 2) != 0) {
1086                                                                                 report.Warning (3007, 1, last.Location,
1087                                                                                         "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant",
1088                                                                                         name_entry.GetSignatureForError ());
1089                                                                         }
1090                                                                 }
1091                                                         }
1092                                                 }
1093                                         }
1094
1095                                         if (i > 0 || name_entry.Kind == MemberKind.Constructor || name_entry.Kind == MemberKind.Indexer)
1096                                                 continue;
1097
1098                                         var name_entry_locase = name_entry.Name.ToLowerInvariant ();
1099
1100                                         MemberSpec[] found;
1101                                         if (!locase_members.TryGetValue (name_entry_locase, out found)) {
1102                                                 found = new MemberSpec[] { name_entry };
1103                                                 locase_members.Add (name_entry_locase, found);
1104                                         } else {
1105                                                 bool same_names_only = true;
1106                                                 foreach (var f in found) {
1107                                                         if (f.Name == name_entry.Name)
1108                                                                 continue;
1109
1110 //                                                      if (f.IsAccessor && name_entry.IsAccessor)
1111 //                                                              continue;
1112
1113                                                         same_names_only = false;
1114                                                         if (!is_imported_type) {
1115                                                                 var last = GetLaterDefinedMember (f, name_entry);
1116                                                                 if (last == f.MemberDefinition) {
1117                                                                         report.SymbolRelatedToPreviousError (name_entry);
1118                                                                 } else {
1119                                                                         report.SymbolRelatedToPreviousError (f);
1120                                                                 }
1121
1122                                                                 report.Warning (3005, 1, last.Location,
1123                                                                         "Identifier `{0}' differing only in case is not CLS-compliant", last.GetSignatureForError ());
1124                                                         }
1125                                                 }
1126
1127                                                 if (!same_names_only) {
1128                                                         Array.Resize (ref found, found.Length + 1);
1129                                                         found[found.Length - 1] = name_entry;
1130                                                         locase_members[name_entry_locase] = found;
1131                                                 }
1132                                         }
1133                                 }
1134                         }
1135                 }
1136
1137                 //
1138                 // Local report helper to issue correctly ordered members stored in hashtable
1139                 //
1140                 static MemberCore GetLaterDefinedMember (MemberSpec a, MemberSpec b)
1141                 {
1142                         var mc_a = a.MemberDefinition as MemberCore;
1143                         var mc_b = b.MemberDefinition as MemberCore;
1144                         if (mc_a == null)
1145                                 return mc_b;
1146
1147                         if (mc_b == null)
1148                                 return mc_a;
1149
1150                         if (mc_a.Location.File != mc_a.Location.File)
1151                                 return mc_b;
1152
1153                         return mc_b.Location.Row > mc_a.Location.Row ? mc_b : mc_a;
1154                 }
1155
1156                 public bool CheckExistingMembersOverloads (MemberCore member, AParametersCollection parameters)
1157                 {
1158                         var name = GetLookupName (member);
1159                         var imb = member as InterfaceMemberBase;
1160                         if (imb != null && imb.IsExplicitImpl) {
1161                                 name = imb.GetFullName (name);
1162                         }
1163
1164                         return CheckExistingMembersOverloads (member, name, parameters);
1165                 }
1166
1167                 public bool CheckExistingMembersOverloads (MemberCore member, string name, AParametersCollection parameters)
1168                 {
1169                         IList<MemberSpec> entries;
1170                         if (!member_hash.TryGetValue (name, out entries))
1171                                 return false;
1172
1173                         var Report = member.Compiler.Report;
1174
1175                         int method_param_count = parameters.Count;
1176                         for (int i = entries.Count - 1; i >= 0; --i) {
1177                                 var ce = entries[i];
1178                                 var pm = ce as IParametersMember;
1179                                 var pd = pm == null ? ParametersCompiled.EmptyReadOnlyParameters : pm.Parameters;
1180                                 if (pd.Count != method_param_count)
1181                                         continue;
1182
1183                                 if (ce.Arity != member.MemberName.Arity)
1184                                         continue;
1185
1186                                 // Ignore merged interface members
1187                                 if (member.Parent.PartialContainer != ce.DeclaringType.MemberDefinition)
1188                                         continue;
1189
1190                                 var p_types = pd.Types;
1191                                 if (method_param_count > 0) {
1192                                         int ii = method_param_count - 1;
1193                                         TypeSpec type_a, type_b;
1194                                         do {
1195                                                 type_a = parameters.Types [ii];
1196                                                 type_b = p_types [ii];
1197
1198                                                 if ((pd.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF) !=
1199                                                         (parameters.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF))
1200                                                         break;
1201
1202                                         } while (TypeSpecComparer.Override.IsEqual (type_a, type_b) && ii-- != 0);
1203
1204                                         if (ii >= 0)
1205                                                 continue;
1206
1207                                         //
1208                                         // Operators can differ in return type only
1209                                         //
1210                                         if (member is Operator && ce.Kind == MemberKind.Operator && ((MethodSpec) ce).ReturnType != ((Operator) member).ReturnType)
1211                                                 continue;
1212
1213                                         //
1214                                         // Report difference in parameter modifiers only
1215                                         //
1216                                         if (pd != null && member is MethodCore) {
1217                                                 ii = method_param_count;
1218                                                 while (ii-- != 0 && parameters.FixedParameters[ii].ModFlags == pd.FixedParameters[ii].ModFlags &&
1219                                                         parameters.ExtensionMethodType == pd.ExtensionMethodType) ;
1220
1221                                                 if (ii >= 0) {
1222                                                         var mc = ce as MethodSpec;
1223                                                         member.Compiler.Report.SymbolRelatedToPreviousError (ce);
1224                                                         if ((member.ModFlags & Modifiers.PARTIAL) != 0 && (mc.Modifiers & Modifiers.PARTIAL) != 0) {
1225                                                                 if (parameters.HasParams || pd.HasParams) {
1226                                                                         Report.Error (758, member.Location,
1227                                                                                 "A partial method declaration and partial method implementation cannot differ on use of `params' modifier");
1228                                                                 } else {
1229                                                                         Report.Error (755, member.Location,
1230                                                                                 "A partial method declaration and partial method implementation must be both an extension method or neither");
1231                                                                 }
1232                                                         } else if (member is Constructor) {
1233                                                                 Report.Error (851, member.Location,
1234                                                                         "Overloaded contructor `{0}' cannot differ on use of parameter modifiers only",
1235                                                                         member.GetSignatureForError ());
1236                                                         } else {
1237                                                                 Report.Error (663, member.Location,
1238                                                                         "Overloaded method `{0}' cannot differ on use of parameter modifiers only",
1239                                                                         member.GetSignatureForError ());
1240                                                         }
1241                                                         return false;
1242                                                 }
1243                                         }
1244                                 }
1245
1246                                 if ((ce.Kind & MemberKind.Method) != 0) {
1247                                         Method method_a = member as Method;
1248                                         Method method_b = ce.MemberDefinition as Method;
1249                                         if (method_a != null && method_b != null && (method_a.ModFlags & method_b.ModFlags & Modifiers.PARTIAL) != 0) {
1250                                                 const Modifiers partial_modifiers = Modifiers.STATIC | Modifiers.UNSAFE;
1251                                                 if (method_a.IsPartialDefinition == method_b.IsPartialImplementation) {
1252                                                         if ((method_a.ModFlags & partial_modifiers) == (method_b.ModFlags & partial_modifiers) ||
1253                                                                 method_a.Parent.IsUnsafe && method_b.Parent.IsUnsafe) {
1254                                                                 if (method_a.IsPartialImplementation) {
1255                                                                         method_a.SetPartialDefinition (method_b);
1256                                                                         if (entries.Count == 1)
1257                                                                                 member_hash.Remove (name);
1258                                                                         else
1259                                                                                 entries.RemoveAt (i);
1260                                                                 } else {
1261                                                                         method_b.SetPartialDefinition (method_a);
1262                                                                         method_a.caching_flags |= MemberCore.Flags.PartialDefinitionExists;
1263                                                                 }
1264                                                                 continue;
1265                                                         }
1266
1267                                                         if (method_a.IsStatic != method_b.IsStatic) {
1268                                                                 Report.SymbolRelatedToPreviousError (ce);
1269                                                                 Report.Error (763, member.Location,
1270                                                                         "A partial method declaration and partial method implementation must be both `static' or neither");
1271                                                         }
1272
1273                                                         Report.SymbolRelatedToPreviousError (ce);
1274                                                         Report.Error (764, member.Location,
1275                                                                 "A partial method declaration and partial method implementation must be both `unsafe' or neither");
1276                                                         return false;
1277                                                 }
1278
1279                                                 Report.SymbolRelatedToPreviousError (ce);
1280                                                 if (method_a.IsPartialDefinition) {
1281                                                         Report.Error (756, member.Location, "A partial method `{0}' declaration is already defined",
1282                                                                 member.GetSignatureForError ());
1283                                                 }
1284
1285                                                 Report.Error (757, member.Location, "A partial method `{0}' implementation is already defined",
1286                                                         member.GetSignatureForError ());
1287                                                 return false;
1288                                         }
1289
1290                                         Report.SymbolRelatedToPreviousError (ce);
1291
1292                                         bool is_reserved_a = member is AbstractPropertyEventMethod || member is Operator;
1293                                         bool is_reserved_b = ((MethodSpec) ce).IsReservedMethod;
1294
1295                                         if (is_reserved_a || is_reserved_b) {
1296                                                 Report.Error (82, member.Location, "A member `{0}' is already reserved",
1297                                                         is_reserved_a ?
1298                                                         ce.GetSignatureForError () :
1299                                                         member.GetSignatureForError ());
1300                                                 return false;
1301                                         }
1302                                 } else {
1303                                         Report.SymbolRelatedToPreviousError (ce);
1304                                 }
1305
1306                                 if (member is Operator && ce.Kind == MemberKind.Operator) {
1307                                         Report.Error (557, member.Location, "Duplicate user-defined conversion in type `{0}'",
1308                                                 member.Parent.GetSignatureForError ());
1309                                         return false;
1310                                 }
1311
1312                                 Report.Error (111, member.Location,
1313                                         "A member `{0}' is already defined. Rename this member or use different parameter types",
1314                                         member.GetSignatureForError ());
1315                                 return false;
1316                         }
1317
1318                         return true;
1319                 }
1320         }
1321 }