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.Text;
  16 using System.Collections.Generic;
  17 using System.Linq;
  18
  19 namespace Mono.CSharp {
  20
  21         [Flags]
  22         public enum MemberKind
  23         {
  24                 Constructor = 1,
  25                 Event = 1 << 1,
  26                 Field = 1 << 2,
  27                 Method = 1 << 3,
  28                 Property = 1 << 4,
  29                 Indexer = 1 << 5,
  30                 Operator = 1 << 6,
  31                 Destructor      = 1 << 7,
  32
  33                 Class           = 1 << 11,
  34                 Struct          = 1 << 12,
  35                 Delegate        = 1 << 13,
  36                 Enum            = 1 << 14,
  37                 Interface       = 1 << 15,
  38                 TypeParameter = 1 << 16,
  39
  40                 ArrayType = 1 << 19,
  41                 PointerType = 1 << 20,
  42                 InternalCompilerType = 1 << 21,
  43
  44                 NestedMask = Class | Struct | Delegate | Enum | Interface,
  45                 GenericMask = Method | Class | Struct | Delegate | Interface,
  46                 MaskType = Constructor | Event | Field | Method | Property | Indexer | Operator | Destructor | NestedMask,
  47                 All = MaskType
  48         }
  49
  50         [Flags]
  51         public enum BindingRestriction
  52         {
  53                 None = 0,
  54
  55                 // Inspect only queried type members
  56                 DeclaredOnly = 1 << 1,
  57
  58                 // Exclude static
  59                 InstanceOnly = 1 << 2,
  60
  61                 NoAccessors = 1 << 3,
  62
  63                 // Member has to be override
  64                 OverrideOnly = 1 << 4
  65         }
  66
  67         public struct MemberFilter : IEquatable<MemberSpec>
  68         {
  69                 public readonly string Name;
  70                 public readonly MemberKind Kind;
  71                 public readonly AParametersCollection Parameters;
  72                 public readonly TypeSpec MemberType;
  73
  74                 int arity; // -1 to ignore the check
  75
  76                 private MemberFilter (string name, MemberKind kind)
  77                 {
  78                         Name = name;
  79                         Kind = kind;
  80                         Parameters = null;
  81                         MemberType = null;
  82                         arity = -1;
  83                 }
  84
  85                 public MemberFilter (MethodSpec m)
  86                 {
  87                         Name = m.Name;
  88                         Kind = MemberKind.Method;
  89                         Parameters = m.Parameters;
  90                         MemberType = m.ReturnType;
  91                         arity = m.Arity;
  92                 }
  93
  94                 public MemberFilter (string name, int arity, MemberKind kind, AParametersCollection param, TypeSpec type)
  95                 {
  96                         Name = name;
  97                         Kind = kind;
  98                         Parameters = param;
  99                         MemberType = type;
 100                         this.arity = arity;
 101                 }
 102
 103                 public static MemberFilter Constructor (AParametersCollection param)
 104                 {
 105                         return new MemberFilter (System.Reflection.ConstructorInfo.ConstructorName, 0, MemberKind.Constructor, param, null);
 106                 }
 107
 108                 public static MemberFilter Property (string name, TypeSpec type)
 109                 {
 110                         return new MemberFilter (name, 0, MemberKind.Property, null, type);
 111                 }
 112
 113                 public static MemberFilter Field (string name, TypeSpec type)
 114                 {
 115                         return new MemberFilter (name, 0, MemberKind.Field, null, type);
 116                 }
 117
 118                 public static MemberFilter Method (string name, int arity, AParametersCollection param, TypeSpec type)
 119                 {
 120                         return new MemberFilter (name, arity, MemberKind.Method, param, type);
 121                 }
 122
 123                 #region IEquatable<MemberSpec> Members
 124
 125                 public bool Equals (MemberSpec other)
 126                 {
 127                         // Is the member of the correct type ?
 128                         // TODO: Isn't this redundant ?
 129                         if ((other.Kind & Kind & MemberKind.MaskType) == 0)
 130                                 return false;
 131
 132                         // Check arity when not disabled
 133                         if (arity >= 0 && arity != other.Arity)
 134                                 return false;
 135
 136                         if (Parameters != null) {
 137                                 if (other is IParametersMember) {
 138                                         var other_param = ((IParametersMember) other).Parameters;
 139                                         if (!TypeSpecComparer.Override.IsEqual (Parameters, other_param))
 140                                                 return false;
 141                                 } else {
 142                                         return false;
 143                                 }
 144                         }
 145
 146                         if (MemberType != null) {
 147                                 if (other is IInterfaceMemberSpec) {
 148                                         var other_type = ((IInterfaceMemberSpec) other).MemberType;
 149                                         if (!TypeSpecComparer.Override.IsEqual (other_type, MemberType))
 150                                                 return false;
 151                                 } else {
 152                                         return false;
 153                                 }
 154                         }
 155
 156                         return true;
 157                 }
 158
 159                 #endregion
 160         }
 161
 162         //
 163         // The MemberCache is the main members container used by compiler. It contains
 164         // all members imported or defined during compilation using on demand filling
 165         // process. Inflated containers are also using MemberCache to make inflated
 166         // members look like normal definition.
 167         //
 168         // All of the methods are performance and memory sensitive as the MemberCache
 169         // is the underlying engine of all member based operations.
 170         //
 171         public class MemberCache
 172         {
 173                 enum StateFlags
 174                 {
 175                         HasConversionOperator = 1 << 1,
 176                         HasUserOperator = 1 << 2
 177                 }
 178
 179                 readonly Dictionary<string, IList<MemberSpec>> member_hash;
 180                 Dictionary<string, MemberSpec[]> locase_members;
 181                 IList<MethodSpec> missing_abstract;
 182                 StateFlags state;
 183
 184                 public static readonly string IndexerNameAlias = "<this>";
 185
 186                 public static readonly MemberCache Empty = new MemberCache (0);
 187
 188                 public MemberCache ()
 189                         : this (16)
 190                 {
 191                 }
 192
 193                 public MemberCache (int capacity)
 194                 {
 195                         member_hash = new Dictionary<string, IList<MemberSpec>> (capacity);
 196                 }
 197
 198                 public MemberCache (MemberCache cache)
 199                         : this (cache.member_hash.Count)
 200                 {
 201                         this.state = cache.state;
 202                 }
 203
 204                 //
 205                 // Creates a new MemberCache for the given `container'.
 206                 //
 207                 public MemberCache (TypeContainer container)
 208                         : this ()                               // TODO: Optimize the size
 209                 {
 210                 }
 211
 212                 //
 213                 // Member-cache does not contain base members but it does
 214                 // contain all base interface members, so the Lookup code
 215                 // can use simple inheritance rules.
 216                 //
 217                 public void AddInterface (TypeSpec iface)
 218                 {
 219                         var cache = iface.MemberCache;
 220
 221                         IList<MemberSpec> list;
 222                         foreach (var entry in cache.member_hash) {
 223                                 if (!member_hash.TryGetValue (entry.Key, out list)) {
 224                                         if (entry.Value.Count == 1) {
 225                                                 list = entry.Value;
 226                                         } else {
 227                                                 list = new List<MemberSpec> (entry.Value);
 228                                         }
 229
 230                                         member_hash.Add (entry.Key, list);
 231                                         continue;
 232                                 }
 233
 234                                 foreach (var ce in entry.Value) {
 235                                         if (list.Contains (ce))
 236                                                 continue;
 237
 238                                         if (AddInterfaceMember (ce, ref list))
 239                                                 member_hash[entry.Key] = list;
 240                                 }
 241                         }
 242
 243                         // Add also all base interfaces
 244                         if (iface.Interfaces != null) {
 245                                 foreach (var base_iface in iface.Interfaces)
 246                                         AddInterface (base_iface);
 247                         }
 248                 }
 249
 250                 public void AddMember (InterfaceMemberBase imb, string exlicitName, MemberSpec ms)
 251                 {
 252                         // Explicit names cannot be looked-up but can be used for
 253                         // collision checking (no name mangling needed)
 254                         if (imb.IsExplicitImpl)
 255                                 AddMember (exlicitName, ms);
 256                         else
 257                                 AddMember (ms);
 258                 }
 259
 260                 //
 261                 // Add non-explicit member to member cache
 262                 //
 263                 public void AddMember (MemberSpec ms)
 264                 {
 265                         AddMember (GetLookupName (ms), ms);
 266                 }
 267
 268                 void AddMember (string name, MemberSpec member)
 269                 {
 270                         if (member.Kind == MemberKind.Operator) {
 271                                 var dt = member.DeclaringType;
 272                                 if (dt == TypeManager.string_type || dt == TypeManager.delegate_type || dt == TypeManager.multicast_delegate_type) {
 273                                         // Some core types have user operators but they cannot be used as normal
 274                                         // user operators as they are predefined and therefore having different
 275                                         // rules (e.g. binary operators) by not setting the flag we hide them for
 276                                         // user conversions
 277                                         // TODO: Should I do this for all core types ?
 278                                 } else if (name == Operator.GetMetadataName (Operator.OpType.Implicit) || name == Operator.GetMetadataName (Operator.OpType.Explicit)) {
 279                                         state |= StateFlags.HasConversionOperator;
 280                                 } else {
 281                                         state |= StateFlags.HasUserOperator;
 282                                 }
 283                         }
 284
 285                         IList<MemberSpec> list;
 286                         if (!member_hash.TryGetValue (name, out list)) {
 287                                 member_hash.Add (name, new MemberSpec[] { member });
 288                                 return;
 289                         }
 290
 291                         if (member.DeclaringType.IsInterface) {
 292                                 if (AddInterfaceMember (member, ref list))
 293                                         member_hash[name] = list;
 294                         } else {
 295                                 if (list is MemberSpec[]) {
 296                                         list = new List<MemberSpec> () { list[0] };
 297                                         member_hash[name] = list;
 298                                 }
 299
 300                                 list.Add (member);
 301                         }
 302                 }
 303
 304                 //
 305                 // Ignores any base interface member which can be hidden
 306                 // by this interface
 307                 //
 308                 static bool AddInterfaceMember (MemberSpec member, ref IList<MemberSpec> existing)
 309                 {
 310                         var member_param = member is IParametersMember ? ((IParametersMember) member).Parameters : ParametersCompiled.EmptyReadOnlyParameters;
 311
 312                         //
 313                         // interface IA : IB { int Prop { set; } }
 314                         // interface IB { bool Prop { get; } }
 315                         //
 316                         // IB.Prop is never accessible from IA interface
 317                         //
 318                         for (int i = 0; i < existing.Count; ++i) {
 319                                 var entry = existing[i];
 320
 321                                 if (entry.Arity != member.Arity)
 322                                         continue;
 323
 324                                 if (entry is IParametersMember) {
 325                                         var entry_param = ((IParametersMember) entry).Parameters;
 326                                         if (!TypeSpecComparer.Override.IsEqual (entry_param, member_param))
 327                                                 continue;
 328                                 }
 329
 330                                 if (member.DeclaringType.ImplementsInterface (entry.DeclaringType, false)) {
 331                                         if (existing is MemberSpec[]) {
 332                                                 existing = new MemberSpec[] { member };
 333                                                 return true;
 334                                         }
 335
 336                                         existing.RemoveAt (i--);
 337                                         continue;
 338                                 }
 339
 340                                 if ((entry.DeclaringType == member.DeclaringType && entry.IsAccessor == member.IsAccessor) ||
 341                                         entry.DeclaringType.ImplementsInterface (member.DeclaringType, false))
 342                                         return false;
 343                         }
 344
 345                         if (existing is MemberSpec[]) {
 346                                 existing = new List<MemberSpec> () { existing[0], member };
 347                                 return true;
 348                         }
 349
 350                         existing.Add (member);
 351                         return false;
 352                 }
 353
 354                 public static MemberSpec FindMember (TypeSpec container, MemberFilter filter, BindingRestriction restrictions)
 355                 {
 356                         do {
 357                                 IList<MemberSpec> applicable;
 358                                 if (container.MemberCache.member_hash.TryGetValue (filter.Name, out applicable)) {
 359                                         // Start from the end because interface members are in reverse order
 360                                         for (int i = applicable.Count - 1; i >= 0; i--) {
 361                                                 var entry = applicable [i];
 362
 363                                                 if ((restrictions & BindingRestriction.InstanceOnly) != 0 && entry.IsStatic)
 364                                                         continue;
 365
 366                                                 if ((restrictions & BindingRestriction.NoAccessors) != 0 && entry.IsAccessor)
 367                                                         continue;
 368
 369                                                 if ((restrictions & BindingRestriction.OverrideOnly) != 0 && (entry.Modifiers & Modifiers.OVERRIDE) == 0)
 370                                                         continue;
 371
 372                                                 if (!filter.Equals (entry))
 373                                                         continue;
 374
 375                                                 if ((restrictions & BindingRestriction.DeclaredOnly) != 0 && container.IsInterface && entry.DeclaringType != container)
 376                                                         continue;
 377
 378                                                 return entry;
 379                                         }
 380                                 }
 381
 382                                 if ((restrictions & BindingRestriction.DeclaredOnly) != 0)
 383                                         break;
 384
 385                                 container = container.BaseType;
 386                         } while (container != null);
 387
 388                         return null;
 389                 }
 390
 391                 //
 392                 // A special method to work with member lookup only. It returns a list of all members named @name
 393                 // starting from @container. It's very performance sensitive
 394                 //
 395                 public static IList<MemberSpec> FindMembers (TypeSpec container, string name, bool declaredOnly)
 396                 {
 397                         IList<MemberSpec> applicable;
 398
 399                         do {
 400                                 if (container.MemberCache.member_hash.TryGetValue (name, out applicable) || declaredOnly)
 401                                         return applicable;
 402
 403                                 container = container.BaseType;
 404                         } while (container != null);
 405
 406                         return null;
 407                 }
 408
 409                 //
 410                 // Finds the nested type in container
 411                 //
 412                 public static TypeSpec FindNestedType (TypeSpec container, string name, int arity)
 413                 {
 414                         IList<MemberSpec> applicable;
 415                         TypeSpec best_match = null;
 416                         do {
 417                                 // TODO: Don't know how to handle this yet
 418                                 // When resolving base type of nested type, parent type must have
 419                                 // base type resolved to scan full hierarchy correctly
 420                                 // Similarly MemberCacheTypes will inflate BaseType and Interfaces
 421                                 // based on type definition
 422                                 var tc = container.MemberDefinition as TypeContainer;
 423                                 if (tc != null)
 424                                         tc.DefineType ();
 425
 426                                 if (container.MemberCacheTypes.member_hash.TryGetValue (name, out applicable)) {
 427                                         for (int i = applicable.Count - 1; i >= 0; i--) {
 428                                                 var entry = applicable[i];
 429                                                 if ((entry.Kind & MemberKind.NestedMask) == 0)
 430                                                         continue;
 431
 432                                                 var ts = (TypeSpec) entry;
 433                                                 if (arity == ts.Arity)
 434                                                         return ts;
 435
 436                                                 if (arity < 0) {
 437                                                         if (best_match == null) {
 438                                                                 best_match = ts;
 439                                                         } else if (System.Math.Abs (ts.Arity + arity) < System.Math.Abs (ts.Arity + arity)) {
 440                                                                 best_match = ts;
 441                                                         }
 442                                                 }
 443                                         }
 444                                 }
 445
 446                                 container = container.BaseType;
 447                         } while (container != null);
 448
 449                         return best_match;
 450                 }
 451
 452                 //
 453                 // Looks for extension methods with defined name and extension type
 454                 //
 455                 public List<MethodSpec> FindExtensionMethods (TypeContainer invocationType, TypeSpec extensionType, string name, int arity)
 456                 {
 457                         IList<MemberSpec> entries;
 458                         if (!member_hash.TryGetValue (name, out entries))
 459                                 return null;
 460
 461                         List<MethodSpec> candidates = null;
 462                         foreach (var entry in entries) {
 463                                 if (entry.Kind != MemberKind.Method || (arity > 0 && entry.Arity != arity))
 464                                         continue;
 465
 466                                 var ms = (MethodSpec) entry;
 467                                 if (!ms.IsExtensionMethod)
 468                                         continue;
 469
 470                                 if (!ms.IsAccessible (invocationType.CurrentType))
 471                                         continue;
 472
 473                                 if ((ms.DeclaringType.Modifiers & Modifiers.INTERNAL) != 0 && !ms.DeclaringType.MemberDefinition.IsInternalAsPublic (invocationType.DeclaringAssembly))
 474                                         continue;
 475
 476                                 if (candidates == null)
 477                                         candidates = new List<MethodSpec> ();
 478                                 candidates.Add (ms);
 479                         }
 480
 481                         return candidates;
 482                 }
 483
 484                 //
 485                 // Returns base members of @member member if no exact match is found @bestCandidate returns
 486                 // the best match
 487                 //
 488                 public static MemberSpec FindBaseMember (MemberCore member, out MemberSpec bestCandidate)
 489                 {
 490                         bestCandidate = null;
 491                         var container = member.Parent.PartialContainer.Definition;
 492                         if (!container.IsInterface) {
 493                                 container = container.BaseType;
 494
 495                                 // It can happen for a user definition of System.Object
 496                                 if (container == null)
 497                                         return null;
 498                         }
 499
 500                         string name = GetLookupName (member);
 501                         IList<MemberSpec> applicable;
 502                         var member_param = member is IParametersMember ? ((IParametersMember) member).Parameters : null;
 503
 504                         var mkind = GetMemberCoreKind (member);
 505                         bool member_with_accessors = mkind == MemberKind.Indexer || mkind == MemberKind.Property;
 506
 507                         do {
 508                                 if (container.MemberCache.member_hash.TryGetValue (name, out applicable)) {
 509                                         for (int i = 0; i < applicable.Count; ++i) {
 510                                                 var entry = applicable [i];
 511
 512                                                 if ((entry.Modifiers & Modifiers.PRIVATE) != 0)
 513                                                         continue;
 514
 515                                                 if ((entry.Modifiers & Modifiers.AccessibilityMask) == Modifiers.INTERNAL &&
 516                                                         !entry.DeclaringType.MemberDefinition.IsInternalAsPublic (member.Module.DeclaringAssembly))
 517                                                         continue;
 518
 519                                                 //
 520                                                 // Is the member of same type ?
 521                                                 //
 522                                                 if ((entry.Kind & ~MemberKind.Destructor & mkind & MemberKind.MaskType) == 0) {
 523                                                         // Destructors are ignored as they cannot be overridden by user
 524                                                         if ((entry.Kind & MemberKind.Destructor) != 0)
 525                                                                 continue;
 526
 527                                                         // Only different arity methods hide
 528                                                         if (mkind != MemberKind.Method && member.MemberName.Arity != entry.Arity)
 529                                                                 continue;
 530
 531                                                         if ((member_param == null || !(entry is IParametersMember))) {
 532                                                                 bestCandidate = entry;
 533                                                                 return null;
 534                                                         }
 535
 536                                                         continue;
 537                                                 }
 538
 539                                                 if (entry.Kind != mkind) {
 540                                                         if (bestCandidate == null)
 541                                                                 bestCandidate = entry;
 542
 543                                                         continue;
 544                                                 }
 545
 546                                                 if (member_param != null) {
 547                                                         // Check arity match
 548                                                         int arity = member.MemberName.Arity;
 549                                                         if (arity != entry.Arity)
 550                                                                 continue;
 551
 552                                                         var pm = entry as IParametersMember;
 553                                                         AParametersCollection entry_parameters;
 554                                                         if (pm == null) {
 555                                                                 if (entry.Kind != MemberKind.Delegate)
 556                                                                         continue;
 557
 558                                                                 // TODO: I don't have DelegateSpec
 559                                                                 entry_parameters = Delegate.GetParameters (member.Compiler, (TypeSpec) entry);
 560                                                         } else {
 561                                                                 entry_parameters = pm.Parameters;
 562                                                         }
 563
 564                                                         if (entry.IsAccessor != member is AbstractPropertyEventMethod)
 565                                                                 continue;
 566
 567                                                         if (!TypeSpecComparer.Override.IsEqual (entry_parameters, member_param))
 568                                                                 continue;
 569                                                 }
 570
 571                                                 //
 572                                                 // Skip override members with accessors they may not fully implement the base member
 573                                                 //
 574                                                 if (member_with_accessors) {
 575                                                         if ((entry.Modifiers & (Modifiers.OVERRIDE | Modifiers.SEALED)) == Modifiers.OVERRIDE) {
 576                                                                 //
 577                                                                 // Set candidate to member override to flag we found an implementation
 578                                                                 //
 579                                                                 bestCandidate = entry;
 580                                                                 continue;
 581                                                         }
 582                                                 } else {
 583                                                         bestCandidate = null;
 584                                                 }
 585
 586                                                 return entry;
 587                                         }
 588                                 }
 589
 590                                 if (container.IsInterface)
 591                                         break;
 592
 593                                 container = container.BaseType;
 594                         } while (container != null);
 595
 596                         return null;
 597                 }
 598
 599                 //
 600                 // Returns inflated version of MemberSpec, it works similarly to
 601                 // SRE TypeBuilder.GetMethod
 602                 //
 603                 public static T GetMember<T> (TypeSpec container, T spec) where T : MemberSpec
 604                 {
 605                         IList<MemberSpec> applicable;
 606                         if (container.MemberCache.member_hash.TryGetValue (GetLookupName (spec), out applicable)) {
 607                                 for (int i = applicable.Count - 1; i >= 0; i--) {
 608                                         var entry = applicable[i];
 609                                         if (entry.MemberDefinition == spec.MemberDefinition)
 610                                                 return (T) entry;
 611                                 }
 612                         }
 613
 614                         throw new InternalErrorException ("Missing member `{0}' on inflated type `{1}'",
 615                                 spec.GetSignatureForError (), container.GetSignatureForError ());
 616                 }
 617
 618                 static MemberKind GetMemberCoreKind (MemberCore member)
 619                 {
 620                         if (member is FieldBase)
 621                                 return MemberKind.Field;
 622                         if (member is Indexer)
 623                                 return MemberKind.Indexer;
 624                         if (member is Class)
 625                                 return MemberKind.Class;
 626                         if (member is Struct)
 627                                 return MemberKind.Struct;
 628                         if (member is Destructor)
 629                                 return MemberKind.Destructor;
 630                         if (member is Method)
 631                                 return MemberKind.Method;
 632                         if (member is Property)
 633                                 return MemberKind.Property;
 634                         if (member is EventField)
 635                                 return MemberKind.Event;
 636                         if (member is Interface)
 637                                 return MemberKind.Interface;
 638                         if (member is EventProperty)
 639                                 return MemberKind.Event;
 640                         if (member is Delegate)
 641                                 return MemberKind.Delegate;
 642                         if (member is Enum)
 643                                 return MemberKind.Enum;
 644
 645                         throw new NotImplementedException (member.GetType ().ToString ());
 646                 }
 647
 648                 public static IList<MemberSpec> GetCompletitionMembers (TypeSpec container, string name)
 649                 {
 650                         var matches = new List<MemberSpec> ();
 651                         foreach (var entry in container.MemberCache.member_hash) {
 652                                 foreach (var name_entry in entry.Value) {
 653                                         if (name_entry.IsAccessor)
 654                                                 continue;
 655
 656                                         if ((name_entry.Kind & (MemberKind.Constructor | MemberKind.Destructor | MemberKind.Operator)) != 0)
 657                                                 continue;
 658
 659                                         if (!name_entry.IsAccessible (InternalType.FakeInternalType))
 660                                                 continue;
 661
 662                                         if (name == null || name_entry.Name.StartsWith (name)) {
 663                                                 matches.Add (name_entry);
 664                                         }
 665                                 }
 666                         }
 667
 668                         return matches;
 669                 }
 670
 671                 //
 672                 // Returns members of @iface only, base members are ignored
 673                 //
 674                 public static IList<MethodSpec> GetInterfaceMethods (TypeSpec iface)
 675                 {
 676                         //
 677                         // MemberCache flatten interfaces, therefore in cases like this one
 678                         //
 679                         // interface IA : IB {}
 680                         // interface IB { void Foo () }
 681                         //
 682                         // we would return Foo inside IA which is not expected in this case
 683                         //
 684                         var methods = new List<MethodSpec> ();
 685                         foreach (var entry in iface.MemberCache.member_hash.Values) {
 686                                 foreach (var name_entry in entry) {
 687                                         if (iface == name_entry.DeclaringType) {
 688                                                 if (name_entry.Kind == MemberKind.Method) {
 689                                                         methods.Add ((MethodSpec) name_entry);
 690                                                 }
 691                                         }
 692                                 }
 693                         }
 694
 695                         return methods;
 696                 }
 697
 698                 //
 699                 // Returns all not implememted abstract members inside abstract type
 700                 // NOTE: Returned list is shared and must not be modified
 701                 //
 702                 public static IList<MethodSpec> GetNotImplementedAbstractMethods (TypeSpec type)
 703                 {
 704                         if (type.MemberCache.missing_abstract != null)
 705                                 return type.MemberCache.missing_abstract;
 706
 707                         var abstract_methods = new List<MethodSpec> ();
 708                         List<TypeSpec> hierarchy = null;
 709
 710                         //
 711                         // Stage 1: top-to-bottom scan for abstract members
 712                         //
 713                         var abstract_type = type;
 714                         while (true) {
 715                                 foreach (var entry in abstract_type.MemberCache.member_hash) {
 716                                         foreach (var name_entry in entry.Value) {
 717                                                 if ((name_entry.Modifiers & Modifiers.ABSTRACT) == 0)
 718                                                         continue;
 719
 720                                                 if (name_entry.Kind != MemberKind.Method)
 721                                                         continue;
 722
 723                                                 abstract_methods.Add ((MethodSpec) name_entry);
 724                                         }
 725                                 }
 726
 727                                 var base_type = abstract_type.BaseType;
 728                                 if (!base_type.IsAbstract)
 729                                         break;
 730
 731                                 if (hierarchy == null)
 732                                         hierarchy = new List<TypeSpec> ();
 733
 734                                 hierarchy.Add (abstract_type);
 735                                 abstract_type = base_type;
 736                         }
 737
 738                         int not_implemented_count = abstract_methods.Count;
 739                         if (not_implemented_count == 0 || hierarchy == null) {
 740                                 type.MemberCache.missing_abstract = abstract_methods;
 741                                 return type.MemberCache.missing_abstract;
 742                         }
 743
 744                         //
 745                         // Stage 2: Remove already implemented methods
 746                         //
 747                         foreach (var type_up in hierarchy) {
 748                                 var members = type_up.MemberCache.member_hash;
 749                                 if (members.Count == 0)
 750                                         continue;
 751
 752                                 for (int i = 0; i < abstract_methods.Count; ++i) {
 753                                         var candidate = abstract_methods [i];
 754                                         if (candidate == null)
 755                                                 continue;
 756
 757                                         IList<MemberSpec> applicable;
 758                                         if (!members.TryGetValue (candidate.Name, out applicable))
 759                                                 continue;
 760
 761                                         var filter = new MemberFilter (candidate);
 762                                         foreach (var item in applicable) {
 763                                                 if ((item.Modifiers & (Modifiers.OVERRIDE | Modifiers.VIRTUAL)) == 0)
 764                                                         continue;
 765
 766                                                 if (filter.Equals (item)) {
 767                                                         --not_implemented_count;
 768                                                         abstract_methods [i] = null;
 769                                                         break;
 770                                                 }
 771                                         }
 772                                 }
 773                         }
 774
 775                         if (not_implemented_count == abstract_methods.Count) {
 776                                 type.MemberCache.missing_abstract = abstract_methods;
 777                                 return type.MemberCache.missing_abstract;
 778                         }
 779
 780                         var not_implemented = new MethodSpec[not_implemented_count];
 781                         int counter = 0;
 782                         foreach (var m in abstract_methods) {
 783                                 if (m == null)
 784                                         continue;
 785
 786                                 not_implemented[counter++] = m;
 787                         }
 788
 789                         type.MemberCache.missing_abstract = not_implemented;
 790                         return type.MemberCache.missing_abstract;
 791                 }
 792
 793                 static string GetLookupName (MemberSpec ms)
 794                 {
 795                         if (ms.Kind == MemberKind.Indexer)
 796                                 return IndexerNameAlias;
 797
 798                         if (ms.Kind == MemberKind.Constructor) {
 799                                 if (ms.IsStatic)
 800                                         return Constructor.TypeConstructorName;
 801
 802                                 return Constructor.ConstructorName;
 803                         }
 804
 805                         return ms.Name;
 806                 }
 807
 808                 static string GetLookupName (MemberCore mc)
 809                 {
 810                         if (mc is Indexer)
 811                                 return IndexerNameAlias;
 812
 813                         if (mc is Constructor)
 814                                 return Constructor.ConstructorName;
 815
 816                         return mc.MemberName.Name;
 817                 }
 818
 819                 //
 820                 // Returns all operators declared on container and its base types (until declaredOnly is used)
 821                 //
 822                 public static IList<MemberSpec> GetUserOperator (TypeSpec container, Operator.OpType op, bool declaredOnly)
 823                 {
 824                         IList<MemberSpec> found = null;
 825
 826                         IList<MemberSpec> applicable;
 827                         do {
 828                                 var mc = container.MemberCache;
 829
 830                                 if (((op == Operator.OpType.Implicit || op == Operator.OpType.Explicit) && (mc.state & StateFlags.HasConversionOperator) != 0) ||
 831                                          (mc.state & StateFlags.HasUserOperator) != 0) {
 832
 833                                         if (mc.member_hash.TryGetValue (Operator.GetMetadataName (op), out applicable)) {
 834                                                 int i;
 835                                                 for (i = 0; i < applicable.Count; ++i) {
 836                                                         if (applicable[i].Kind != MemberKind.Operator) {
 837                                                                 break;
 838                                                         }
 839                                                 }
 840
 841                                                 //
 842                                                 // Handles very rare case where a method with same name as operator (op_xxxx) exists
 843                                                 // and we have to resize the applicable list
 844                                                 //
 845                                                 if (i != applicable.Count) {
 846                                                         for (i = 0; i < applicable.Count; ++i) {
 847                                                                 if (applicable[i].Kind != MemberKind.Operator) {
 848                                                                         continue;
 849                                                                 }
 850
 851                                                                 if (found == null) {
 852                                                                         found = new List<MemberSpec> ();
 853                                                                         found.Add (applicable[i]);
 854                                                                 } else {
 855                                                                         var prev = found as List<MemberSpec>;
 856                                                                         if (prev == null) {
 857                                                                                 prev = new List<MemberSpec> (found.Count + 1);
 858                                                                                 prev.AddRange (found);
 859                                                                         }
 860
 861                                                                         prev.Add (applicable[i]);
 862                                                                 }
 863                                                         }
 864                                                 } else {
 865                                                         if (found == null) {
 866                                                                 found = applicable;
 867                                                         } else {
 868                                                                 var merged = found as List<MemberSpec>;
 869                                                                 if (merged == null) {
 870                                                                         merged = new List<MemberSpec> (found.Count + applicable.Count);
 871                                                                         merged.AddRange (found);
 872                                                                         found = merged;
 873                                                                 }
 874
 875                                                                 merged.AddRange (applicable);
 876                                                         }
 877                                                 }
 878                                         }
 879                                 }
 880
 881                                 // BaseType call can be expensive
 882                                 if (declaredOnly)
 883                                         break;
 884
 885                                 container = container.BaseType;
 886                         } while (container != null);
 887
 888                         return found;
 889                 }
 890
 891                 //
 892                 // Inflates all member cache nested types
 893                 //
 894                 public void InflateTypes (MemberCache inflated_cache, TypeParameterInflator inflator)
 895                 {
 896                         foreach (var item in member_hash) {
 897                                 IList<MemberSpec> inflated_members = null;
 898                                 for (int i = 0; i < item.Value.Count; ++i ) {
 899                                         var member = item.Value[i];
 900
 901                                         // FIXME: When inflating members refering nested types before they are inflated
 902                                         if (member == null)
 903                                                 continue;
 904
 905                                         if ((member.Kind & MemberKind.NestedMask) != 0 &&
 906                                                 (member.Modifiers & Modifiers.COMPILER_GENERATED) == 0) {
 907                                                 if (inflated_members == null) {
 908                                                         inflated_members = new MemberSpec[item.Value.Count];
 909                                                         inflated_cache.member_hash.Add (item.Key, inflated_members);
 910                                                 }
 911
 912                                                 inflated_members [i] = member.InflateMember (inflator);
 913                                         }
 914                                 }
 915                         }
 916                 }
 917
 918                 //
 919                 // Inflates all open type members, requires InflateTypes to be called before
 920                 //
 921                 public void InflateMembers (MemberCache cacheToInflate, TypeSpec inflatedType, TypeParameterInflator inflator)
 922                 {
 923                         var inflated_member_hash = cacheToInflate.member_hash;
 924                         Dictionary<MemberSpec, MethodSpec> accessor_relation = null;
 925                         List<MemberSpec> accessor_members = null;
 926
 927                         // Copy member specific flags when all members were added
 928                         cacheToInflate.state = state;
 929
 930                         foreach (var item in member_hash) {
 931                                 var members = item.Value;
 932                                 IList<MemberSpec> inflated_members = null;
 933                                 for (int i = 0; i < members.Count; ++i ) {
 934                                         var member = members[i];
 935
 936                                         //
 937                                         // All nested types have been inflated earlier except for
 938                                         // compiler types which are created later and could miss InflateTypes
 939                                         //
 940                                         if ((member.Kind & MemberKind.NestedMask) != 0 &&
 941                                                 (member.Modifiers & Modifiers.COMPILER_GENERATED) == 0) {
 942                                                 if (inflated_members == null)
 943                                                         inflated_members = inflated_member_hash[item.Key];
 944
 945                                                 continue;
 946                                         }
 947
 948                                         //
 949                                         // Clone the container first
 950                                         //
 951                                         if (inflated_members == null) {
 952                                                 inflated_members = new MemberSpec [item.Value.Count];
 953                                                 inflated_member_hash.Add (item.Key, inflated_members);
 954                                         }
 955
 956                                         var local_inflator = inflator;
 957
 958                                         if (member.DeclaringType != inflatedType) {
 959                                                 //
 960                                                 // Don't inflate top-level non-generic interface members
 961                                                 // merged into generic interface
 962                                                 //
 963                                                 if (!member.DeclaringType.IsGeneric && !member.DeclaringType.IsNested) {
 964                                                         inflated_members [i] = member;
 965                                                         continue;
 966                                                 }
 967
 968                                                 //
 969                                                 // Needed when inflating flatten interfaces. It inflates
 970                                                 // container type only, type parameters are already done
 971                                                 //
 972                                                 // Handles cases like:
 973                                                 //
 974                                                 // interface I<T> {}
 975                                                 // interface I<U, V> : I<U> {}
 976                                                 //
 977                                                 // class C: I<int, bool> {}
 978                                                 //
 979                                                 var inflated_parent = inflator.Inflate (member.DeclaringType);
 980                                                 if (inflated_parent != inflator.TypeInstance)
 981                                                         local_inflator = new TypeParameterInflator (inflator, inflated_parent);
 982                                         }
 983
 984                                         //
 985                                         // Inflate every member, its parent is now different
 986                                         //
 987                                         var inflated = member.InflateMember (local_inflator);
 988                                         inflated_members [i] = inflated;
 989
 990                                         if (member is PropertySpec || member is EventSpec) {
 991                                                 if (accessor_members == null)
 992                                                         accessor_members = new List<MemberSpec> ();
 993
 994                                                 accessor_members.Add (inflated);
 995                                                 continue;
 996                                         }
 997
 998                                         if (member.IsAccessor) {
 999                                                 if (accessor_relation == null)
1000                                                         accessor_relation = new Dictionary<MemberSpec, MethodSpec> ();
1001                                                 accessor_relation.Add (member, (MethodSpec) inflated);
1002                                         }
1003                                 }
1004                         }
1005
1006                         if (accessor_members != null) {
1007                                 foreach (var member in accessor_members) {
1008                                         var prop = member as PropertySpec;
1009                                         if (prop != null) {
1010                                                 if (prop.Get != null)
1011                                                         prop.Get = accessor_relation[prop.Get];
1012                                                 if (prop.Set != null)
1013                                                         prop.Set = accessor_relation[prop.Set];
1014
1015                                                 continue;
1016                                         }
1017
1018                                         var ev = (EventSpec) member;
1019                                         ev.AccessorAdd = accessor_relation[ev.AccessorAdd];
1020                                         ev.AccessorRemove = accessor_relation[ev.AccessorRemove];
1021                                 }
1022                         }
1023                 }
1024
1025                 //
1026                 // Checks all appropriate container members for CLS compliance
1027                 //
1028                 public void VerifyClsCompliance (TypeSpec container, Report report)
1029                 {
1030                         if (locase_members != null)
1031                                 return;
1032
1033                         if (container.BaseType == null) {
1034                                 locase_members = new Dictionary<string, MemberSpec[]> (member_hash.Count); // StringComparer.OrdinalIgnoreCase);
1035                         } else {
1036                                 container.BaseType.MemberCache.VerifyClsCompliance (container.BaseType, report);
1037                                 locase_members = new Dictionary<string, MemberSpec[]> (container.BaseType.MemberCache.locase_members); //, StringComparer.OrdinalIgnoreCase);
1038                         }
1039
1040                         var is_imported_type = container.MemberDefinition.IsImported;
1041                         foreach (var entry in container.MemberCache.member_hash) {
1042                                 for (int i = 0; i < entry.Value.Count; ++i ) {
1043                                         var name_entry = entry.Value[i];
1044                                         if ((name_entry.Modifiers & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
1045                                                 continue;
1046
1047                                         if ((name_entry.Modifiers & (Modifiers.OVERRIDE | Modifiers.COMPILER_GENERATED)) != 0)
1048                                                 continue;
1049
1050                                         if ((name_entry.Kind & MemberKind.MaskType) == 0)
1051                                                 continue;
1052
1053                                         if (name_entry.MemberDefinition.IsNotCLSCompliant ())
1054                                             continue;
1055
1056                                         IParametersMember p_a = name_entry as IParametersMember;
1057                                         if (p_a != null && !name_entry.IsAccessor) {
1058                                                 if (!is_imported_type) {
1059                                                         var p_a_pd = p_a.Parameters;
1060                                                         for (int ii = i + 1; ii < entry.Value.Count; ++ii) {
1061                                                                 var checked_entry = entry.Value[ii];
1062                                                                 IParametersMember p_b = checked_entry as IParametersMember;
1063                                                                 if (p_b == null)
1064                                                                         continue;
1065
1066                                                                 if (p_a_pd.Count != p_b.Parameters.Count)
1067                                                                         continue;
1068
1069                                                                 if (checked_entry.IsAccessor)
1070                                                                         continue;
1071
1072                                                                 var res = ParametersCompiled.IsSameClsSignature (p_a.Parameters, p_b.Parameters);
1073                                                                 if (res != 0) {
1074                                                                         var last = GetLaterDefinedMember (checked_entry, name_entry);
1075                                                                         if (last == checked_entry.MemberDefinition) {
1076                                                                                 report.SymbolRelatedToPreviousError (name_entry);
1077                                                                         } else {
1078                                                                                 report.SymbolRelatedToPreviousError (checked_entry);
1079                                                                         }
1080
1081                                                                         if ((res & 1) != 0) {
1082                                                                                 report.Warning (3006, 1, last.Location,
1083                                                                                                 "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant",
1084                                                                                                 name_entry.GetSignatureForError ());
1085                                                                         }
1086
1087                                                                         if ((res & 2) != 0) {
1088                                                                                 report.Warning (3007, 1, last.Location,
1089                                                                                         "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant",
1090                                                                                         name_entry.GetSignatureForError ());
1091                                                                         }
1092                                                                 }
1093                                                         }
1094                                                 }
1095                                         }
1096
1097                                         if (i > 0 || name_entry.Kind == MemberKind.Constructor || name_entry.Kind == MemberKind.Indexer)
1098                                                 continue;
1099
1100                                         var name_entry_locase = name_entry.Name.ToLowerInvariant ();
1101
1102                                         MemberSpec[] found;
1103                                         if (!locase_members.TryGetValue (name_entry_locase, out found)) {
1104                                                 found = new MemberSpec[] { name_entry };
1105                                                 locase_members.Add (name_entry_locase, found);
1106                                         } else {
1107                                                 bool same_names_only = true;
1108                                                 foreach (var f in found) {
1109                                                         if (f.Name == name_entry.Name)
1110                                                                 continue;
1111
1112 //                                                      if (f.IsAccessor && name_entry.IsAccessor)
1113 //                                                              continue;
1114
1115                                                         same_names_only = false;
1116                                                         if (!is_imported_type) {
1117                                                                 var last = GetLaterDefinedMember (f, name_entry);
1118                                                                 if (last == f.MemberDefinition) {
1119                                                                         report.SymbolRelatedToPreviousError (name_entry);
1120                                                                 } else {
1121                                                                         report.SymbolRelatedToPreviousError (f);
1122                                                                 }
1123
1124                                                                 report.Warning (3005, 1, last.Location,
1125                                                                         "Identifier `{0}' differing only in case is not CLS-compliant", last.GetSignatureForError ());
1126                                                         }
1127                                                 }
1128
1129                                                 if (!same_names_only) {
1130                                                         Array.Resize (ref found, found.Length + 1);
1131                                                         found[found.Length - 1] = name_entry;
1132                                                         locase_members[name_entry_locase] = found;
1133                                                 }
1134                                         }
1135                                 }
1136                         }
1137                 }
1138
1139                 //
1140                 // Local report helper to issue correctly ordered members stored in hashtable
1141                 //
1142                 static MemberCore GetLaterDefinedMember (MemberSpec a, MemberSpec b)
1143                 {
1144                         var mc_a = a.MemberDefinition as MemberCore;
1145                         var mc_b = b.MemberDefinition as MemberCore;
1146                         if (mc_a == null)
1147                                 return mc_b;
1148
1149                         if (mc_b == null)
1150                                 return mc_a;
1151
1152                         if (mc_a.Location.File != mc_a.Location.File)
1153                                 return mc_b;
1154
1155                         return mc_b.Location.Row > mc_a.Location.Row ? mc_b : mc_a;
1156                 }
1157
1158                 public bool CheckExistingMembersOverloads (MemberCore member, AParametersCollection parameters)
1159                 {
1160                         var name = GetLookupName (member);
1161                         var imb = member as InterfaceMemberBase;
1162                         if (imb != null && imb.IsExplicitImpl) {
1163                                 name = imb.GetFullName (name);
1164                         }
1165
1166                         return CheckExistingMembersOverloads (member, name, parameters);
1167                 }
1168
1169                 public bool CheckExistingMembersOverloads (MemberCore member, string name, AParametersCollection parameters)
1170                 {
1171                         IList<MemberSpec> entries;
1172                         if (!member_hash.TryGetValue (name, out entries))
1173                                 return false;
1174
1175                         var Report = member.Compiler.Report;
1176
1177                         int method_param_count = parameters.Count;
1178                         for (int i = entries.Count - 1; i >= 0; --i) {
1179                                 var ce = entries[i];
1180                                 var pm = ce as IParametersMember;
1181                                 var pd = pm == null ? ParametersCompiled.EmptyReadOnlyParameters : pm.Parameters;
1182                                 if (pd.Count != method_param_count)
1183                                         continue;
1184
1185                                 if (ce.Arity != member.MemberName.Arity)
1186                                         continue;
1187
1188                                 // Ignore merged interface members
1189                                 if (member.Parent.PartialContainer != ce.DeclaringType.MemberDefinition)
1190                                         continue;
1191
1192                                 var p_types = pd.Types;
1193                                 if (method_param_count > 0) {
1194                                         int ii = method_param_count - 1;
1195                                         TypeSpec type_a, type_b;
1196                                         do {
1197                                                 type_a = parameters.Types [ii];
1198                                                 type_b = p_types [ii];
1199
1200                                                 if ((pd.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF) !=
1201                                                         (parameters.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF))
1202                                                         break;
1203
1204                                         } while (TypeSpecComparer.Override.IsEqual (type_a, type_b) && ii-- != 0);
1205
1206                                         if (ii >= 0)
1207                                                 continue;
1208
1209                                         //
1210                                         // Operators can differ in return type only
1211                                         //
1212                                         if (member is Operator && ce.Kind == MemberKind.Operator && ((MethodSpec) ce).ReturnType != ((Operator) member).ReturnType)
1213                                                 continue;
1214
1215                                         //
1216                                         // Report difference in parameter modifiers only
1217                                         //
1218                                         if (pd != null && member is MethodCore) {
1219                                                 ii = method_param_count;
1220                                                 while (ii-- != 0 && parameters.FixedParameters[ii].ModFlags == pd.FixedParameters[ii].ModFlags &&
1221                                                         parameters.ExtensionMethodType == pd.ExtensionMethodType) ;
1222
1223                                                 if (ii >= 0) {
1224                                                         var mc = ce as MethodSpec;
1225                                                         member.Compiler.Report.SymbolRelatedToPreviousError (ce);
1226                                                         if ((member.ModFlags & Modifiers.PARTIAL) != 0 && (mc.Modifiers & Modifiers.PARTIAL) != 0) {
1227                                                                 if (parameters.HasParams || pd.HasParams) {
1228                                                                         Report.Error (758, member.Location,
1229                                                                                 "A partial method declaration and partial method implementation cannot differ on use of `params' modifier");
1230                                                                 } else {
1231                                                                         Report.Error (755, member.Location,
1232                                                                                 "A partial method declaration and partial method implementation must be both an extension method or neither");
1233                                                                 }
1234                                                         } else if (member is Constructor) {
1235                                                                 Report.Error (851, member.Location,
1236                                                                         "Overloaded contructor `{0}' cannot differ on use of parameter modifiers only",
1237                                                                         member.GetSignatureForError ());
1238                                                         } else {
1239                                                                 Report.Error (663, member.Location,
1240                                                                         "Overloaded method `{0}' cannot differ on use of parameter modifiers only",
1241                                                                         member.GetSignatureForError ());
1242                                                         }
1243                                                         return false;
1244                                                 }
1245                                         }
1246                                 }
1247
1248                                 if ((ce.Kind & MemberKind.Method) != 0) {
1249                                         Method method_a = member as Method;
1250                                         Method method_b = ce.MemberDefinition as Method;
1251                                         if (method_a != null && method_b != null && (method_a.ModFlags & method_b.ModFlags & Modifiers.PARTIAL) != 0) {
1252                                                 const Modifiers partial_modifiers = Modifiers.STATIC | Modifiers.UNSAFE;
1253                                                 if (method_a.IsPartialDefinition == method_b.IsPartialImplementation) {
1254                                                         if ((method_a.ModFlags & partial_modifiers) == (method_b.ModFlags & partial_modifiers) ||
1255                                                                 method_a.Parent.IsUnsafe && method_b.Parent.IsUnsafe) {
1256                                                                 if (method_a.IsPartialImplementation) {
1257                                                                         method_a.SetPartialDefinition (method_b);
1258                                                                         if (entries.Count == 1)
1259                                                                                 member_hash.Remove (name);
1260                                                                         else
1261                                                                                 entries.RemoveAt (i);
1262                                                                 } else {
1263                                                                         method_b.SetPartialDefinition (method_a);
1264                                                                         method_a.caching_flags |= MemberCore.Flags.PartialDefinitionExists;
1265                                                                 }
1266                                                                 continue;
1267                                                         }
1268
1269                                                         if (method_a.IsStatic != method_b.IsStatic) {
1270                                                                 Report.SymbolRelatedToPreviousError (ce);
1271                                                                 Report.Error (763, member.Location,
1272                                                                         "A partial method declaration and partial method implementation must be both `static' or neither");
1273                                                         }
1274
1275                                                         Report.SymbolRelatedToPreviousError (ce);
1276                                                         Report.Error (764, member.Location,
1277                                                                 "A partial method declaration and partial method implementation must be both `unsafe' or neither");
1278                                                         return false;
1279                                                 }
1280
1281                                                 Report.SymbolRelatedToPreviousError (ce);
1282                                                 if (method_a.IsPartialDefinition) {
1283                                                         Report.Error (756, member.Location, "A partial method `{0}' declaration is already defined",
1284                                                                 member.GetSignatureForError ());
1285                                                 }
1286
1287                                                 Report.Error (757, member.Location, "A partial method `{0}' implementation is already defined",
1288                                                         member.GetSignatureForError ());
1289                                                 return false;
1290                                         }
1291
1292                                         Report.SymbolRelatedToPreviousError (ce);
1293
1294                                         bool is_reserved_a = member is AbstractPropertyEventMethod || member is Operator;
1295                                         bool is_reserved_b = ((MethodSpec) ce).IsReservedMethod;
1296
1297                                         if (is_reserved_a || is_reserved_b) {
1298                                                 Report.Error (82, member.Location, "A member `{0}' is already reserved",
1299                                                         is_reserved_a ?
1300                                                         ce.GetSignatureForError () :
1301                                                         member.GetSignatureForError ());
1302                                                 return false;
1303                                         }
1304                                 } else {
1305                                         Report.SymbolRelatedToPreviousError (ce);
1306                                 }
1307
1308                                 if (member is Operator && ce.Kind == MemberKind.Operator) {
1309                                         Report.Error (557, member.Location, "Duplicate user-defined conversion in type `{0}'",
1310                                                 member.Parent.GetSignatureForError ());
1311                                         return false;
1312                                 }
1313
1314                                 Report.Error (111, member.Location,
1315                                         "A member `{0}' is already defined. Rename this member or use different parameter types",
1316                                         member.GetSignatureForError ());
1317                                 return false;
1318                         }
1319
1320                         return true;
1321                 }
1322         }
1323 }