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 (TypeSpec 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))
 471                                         continue;
 472
 473                                 // TODO: CodeGen.Assembly.Builder
 474                                 if ((ms.DeclaringType.Modifiers & Modifiers.INTERNAL) != 0 &&
 475                                         !TypeManager.IsThisOrFriendAssembly (CodeGen.Assembly.Builder, ms.Assembly))
 476                                         continue;
 477
 478                                 if (candidates == null)
 479                                         candidates = new List<MethodSpec> ();
 480                                 candidates.Add (ms);
 481                         }
 482
 483                         return candidates;
 484                 }
 485
 486                 //
 487                 // Returns base members of @member member if no exact match is found @bestCandidate returns
 488                 // the best match
 489                 //
 490                 public static MemberSpec FindBaseMember (MemberCore member, out MemberSpec bestCandidate)
 491                 {
 492                         bestCandidate = null;
 493                         var container = member.Parent.PartialContainer.Definition;
 494                         if (!container.IsInterface) {
 495                                 container = container.BaseType;
 496
 497                                 // It can happen for a user definition of System.Object
 498                                 if (container == null)
 499                                         return null;
 500                         }
 501
 502                         string name = GetLookupName (member);
 503                         IList<MemberSpec> applicable;
 504                         var member_param = member is IParametersMember ? ((IParametersMember) member).Parameters : null;
 505
 506                         var mkind = GetMemberCoreKind (member);
 507                         bool member_with_accessors = mkind == MemberKind.Indexer || mkind == MemberKind.Property;
 508
 509                         do {
 510                                 if (container.MemberCache.member_hash.TryGetValue (name, out applicable)) {
 511                                         for (int i = 0; i < applicable.Count; ++i) {
 512                                                 var entry = applicable [i];
 513
 514                                                 if ((entry.Modifiers & Modifiers.PRIVATE) != 0)
 515                                                         continue;
 516
 517                                                 if ((entry.Modifiers & Modifiers.AccessibilityMask) == Modifiers.INTERNAL) {
 518                                                         if (!TypeManager.IsThisOrFriendAssembly (member.Assembly, entry.Assembly))
 519                                                                 continue;
 520                                                 }
 521
 522                                                 //
 523                                                 // Is the member of same type ?
 524                                                 //
 525                                                 if ((entry.Kind & ~MemberKind.Destructor & mkind & MemberKind.MaskType) == 0) {
 526                                                         // Destructors are ignored as they cannot be overridden by user
 527                                                         if ((entry.Kind & MemberKind.Destructor) != 0)
 528                                                                 continue;
 529
 530                                                         // Only different arity methods hide
 531                                                         if (mkind != MemberKind.Method && member.MemberName.Arity != entry.Arity)
 532                                                                 continue;
 533
 534                                                         if ((member_param == null || !(entry is IParametersMember))) {
 535                                                                 bestCandidate = entry;
 536                                                                 return null;
 537                                                         }
 538
 539                                                         continue;
 540                                                 }
 541
 542                                                 if (entry.Kind != mkind) {
 543                                                         if (bestCandidate == null)
 544                                                                 bestCandidate = entry;
 545
 546                                                         continue;
 547                                                 }
 548
 549                                                 if (member_param != null) {
 550                                                         // Check arity match
 551                                                         int arity = member.MemberName.Arity;
 552                                                         if (arity != entry.Arity)
 553                                                                 continue;
 554
 555                                                         var pm = entry as IParametersMember;
 556                                                         AParametersCollection entry_parameters;
 557                                                         if (pm == null) {
 558                                                                 if (entry.Kind != MemberKind.Delegate)
 559                                                                         continue;
 560
 561                                                                 // TODO: I don't have DelegateSpec
 562                                                                 entry_parameters = Delegate.GetParameters (member.Compiler, (TypeSpec) entry);
 563                                                         } else {
 564                                                                 entry_parameters = pm.Parameters;
 565                                                         }
 566
 567                                                         if (entry.IsAccessor != member is AbstractPropertyEventMethod)
 568                                                                 continue;
 569
 570                                                         if (!TypeSpecComparer.Override.IsEqual (entry_parameters, member_param))
 571                                                                 continue;
 572                                                 }
 573
 574                                                 //
 575                                                 // Skip override members with accessors they may not fully implement the base member
 576                                                 //
 577                                                 if (member_with_accessors) {
 578                                                         if ((entry.Modifiers & (Modifiers.OVERRIDE | Modifiers.SEALED)) == Modifiers.OVERRIDE) {
 579                                                                 //
 580                                                                 // Set candidate to member override to flag we found an implementation
 581                                                                 //
 582                                                                 bestCandidate = entry;
 583                                                                 continue;
 584                                                         }
 585                                                 } else {
 586                                                         bestCandidate = null;
 587                                                 }
 588
 589                                                 return entry;
 590                                         }
 591                                 }
 592
 593                                 if (container.IsInterface)
 594                                         break;
 595
 596                                 container = container.BaseType;
 597                         } while (container != null);
 598
 599                         return null;
 600                 }
 601
 602                 //
 603                 // Returns inflated version of MemberSpec, it works similarly to
 604                 // SRE TypeBuilder.GetMethod
 605                 //
 606                 public static T GetMember<T> (TypeSpec container, T spec) where T : MemberSpec
 607                 {
 608                         IList<MemberSpec> applicable;
 609                         if (container.MemberCache.member_hash.TryGetValue (GetLookupName (spec), out applicable)) {
 610                                 for (int i = applicable.Count - 1; i >= 0; i--) {
 611                                         var entry = applicable[i];
 612                                         if (entry.MemberDefinition == spec.MemberDefinition)
 613                                                 return (T) entry;
 614                                 }
 615                         }
 616
 617                         throw new InternalErrorException ("Missing member `{0}' on inflated type `{1}'",
 618                                 spec.GetSignatureForError (), container.GetSignatureForError ());
 619                 }
 620
 621                 static MemberKind GetMemberCoreKind (MemberCore member)
 622                 {
 623                         if (member is FieldBase)
 624                                 return MemberKind.Field;
 625                         if (member is Indexer)
 626                                 return MemberKind.Indexer;
 627                         if (member is Class)
 628                                 return MemberKind.Class;
 629                         if (member is Struct)
 630                                 return MemberKind.Struct;
 631                         if (member is Destructor)
 632                                 return MemberKind.Destructor;
 633                         if (member is Method)
 634                                 return MemberKind.Method;
 635                         if (member is Property)
 636                                 return MemberKind.Property;
 637                         if (member is EventField)
 638                                 return MemberKind.Event;
 639                         if (member is Interface)
 640                                 return MemberKind.Interface;
 641                         if (member is EventProperty)
 642                                 return MemberKind.Event;
 643                         if (member is Delegate)
 644                                 return MemberKind.Delegate;
 645                         if (member is Enum)
 646                                 return MemberKind.Enum;
 647
 648                         throw new NotImplementedException (member.GetType ().ToString ());
 649                 }
 650
 651                 public static IList<MemberSpec> GetCompletitionMembers (TypeSpec container, string name)
 652                 {
 653                         var matches = new List<MemberSpec> ();
 654                         foreach (var entry in container.MemberCache.member_hash) {
 655                                 foreach (var name_entry in entry.Value) {
 656                                         if (name_entry.IsAccessor)
 657                                                 continue;
 658
 659                                         if ((name_entry.Kind & (MemberKind.Constructor | MemberKind.Destructor | MemberKind.Operator)) != 0)
 660                                                 continue;
 661
 662                                         if (!name_entry.IsAccessible (InternalType.FakeInternalType))
 663                                                 continue;
 664
 665                                         if (name == null || name_entry.Name.StartsWith (name)) {
 666                                                 matches.Add (name_entry);
 667                                         }
 668                                 }
 669                         }
 670
 671                         return matches;
 672                 }
 673
 674                 //
 675                 // Returns members of @iface only, base members are ignored
 676                 //
 677                 public static IList<MethodSpec> GetInterfaceMethods (TypeSpec iface)
 678                 {
 679                         //
 680                         // MemberCache flatten interfaces, therefore in cases like this one
 681                         //
 682                         // interface IA : IB {}
 683                         // interface IB { void Foo () }
 684                         //
 685                         // we would return Foo inside IA which is not expected in this case
 686                         //
 687                         var methods = new List<MethodSpec> ();
 688                         foreach (var entry in iface.MemberCache.member_hash.Values) {
 689                                 foreach (var name_entry in entry) {
 690                                         if (iface == name_entry.DeclaringType) {
 691                                                 if (name_entry.Kind == MemberKind.Method) {
 692                                                         methods.Add ((MethodSpec) name_entry);
 693                                                 }
 694                                         }
 695                                 }
 696                         }
 697
 698                         return methods;
 699                 }
 700
 701                 //
 702                 // Returns all not implememted abstract members inside abstract type
 703                 // NOTE: Returned list is shared and must not be modified
 704                 //
 705                 public static IList<MethodSpec> GetNotImplementedAbstractMethods (TypeSpec type)
 706                 {
 707                         if (type.MemberCache.missing_abstract != null)
 708                                 return type.MemberCache.missing_abstract;
 709
 710                         var abstract_methods = new List<MethodSpec> ();
 711                         List<TypeSpec> hierarchy = null;
 712
 713                         //
 714                         // Stage 1: top-to-bottom scan for abstract members
 715                         //
 716                         var abstract_type = type;
 717                         while (true) {
 718                                 foreach (var entry in abstract_type.MemberCache.member_hash) {
 719                                         foreach (var name_entry in entry.Value) {
 720                                                 if ((name_entry.Modifiers & Modifiers.ABSTRACT) == 0)
 721                                                         continue;
 722
 723                                                 if (name_entry.Kind != MemberKind.Method)
 724                                                         continue;
 725
 726                                                 abstract_methods.Add ((MethodSpec) name_entry);
 727                                         }
 728                                 }
 729
 730                                 var base_type = abstract_type.BaseType;
 731                                 if (!base_type.IsAbstract)
 732                                         break;
 733
 734                                 if (hierarchy == null)
 735                                         hierarchy = new List<TypeSpec> ();
 736
 737                                 hierarchy.Add (abstract_type);
 738                                 abstract_type = base_type;
 739                         }
 740
 741                         int not_implemented_count = abstract_methods.Count;
 742                         if (not_implemented_count == 0 || hierarchy == null) {
 743                                 type.MemberCache.missing_abstract = abstract_methods;
 744                                 return type.MemberCache.missing_abstract;
 745                         }
 746
 747                         //
 748                         // Stage 2: Remove already implemented methods
 749                         //
 750                         foreach (var type_up in hierarchy) {
 751                                 var members = type_up.MemberCache.member_hash;
 752                                 if (members.Count == 0)
 753                                         continue;
 754
 755                                 for (int i = 0; i < abstract_methods.Count; ++i) {
 756                                         var candidate = abstract_methods [i];
 757                                         if (candidate == null)
 758                                                 continue;
 759
 760                                         IList<MemberSpec> applicable;
 761                                         if (!members.TryGetValue (candidate.Name, out applicable))
 762                                                 continue;
 763
 764                                         var filter = new MemberFilter (candidate);
 765                                         foreach (var item in applicable) {
 766                                                 if ((item.Modifiers & (Modifiers.OVERRIDE | Modifiers.VIRTUAL)) == 0)
 767                                                         continue;
 768
 769                                                 if (filter.Equals (item)) {
 770                                                         --not_implemented_count;
 771                                                         abstract_methods [i] = null;
 772                                                         break;
 773                                                 }
 774                                         }
 775                                 }
 776                         }
 777
 778                         if (not_implemented_count == abstract_methods.Count) {
 779                                 type.MemberCache.missing_abstract = abstract_methods;
 780                                 return type.MemberCache.missing_abstract;
 781                         }
 782
 783                         var not_implemented = new MethodSpec[not_implemented_count];
 784                         int counter = 0;
 785                         foreach (var m in abstract_methods) {
 786                                 if (m == null)
 787                                         continue;
 788
 789                                 not_implemented[counter++] = m;
 790                         }
 791
 792                         type.MemberCache.missing_abstract = not_implemented;
 793                         return type.MemberCache.missing_abstract;
 794                 }
 795
 796                 static string GetLookupName (MemberSpec ms)
 797                 {
 798                         if (ms.Kind == MemberKind.Indexer)
 799                                 return IndexerNameAlias;
 800
 801                         if (ms.Kind == MemberKind.Constructor) {
 802                                 if (ms.IsStatic)
 803                                         return Constructor.TypeConstructorName;
 804
 805                                 return Constructor.ConstructorName;
 806                         }
 807
 808                         return ms.Name;
 809                 }
 810
 811                 static string GetLookupName (MemberCore mc)
 812                 {
 813                         if (mc is Indexer)
 814                                 return IndexerNameAlias;
 815
 816                         if (mc is Constructor)
 817                                 return Constructor.ConstructorName;
 818
 819                         return mc.MemberName.Name;
 820                 }
 821
 822                 //
 823                 // Returns all operators declared on container and its base types (until declaredOnly is used)
 824                 //
 825                 public static IList<MemberSpec> GetUserOperator (TypeSpec container, Operator.OpType op, bool declaredOnly)
 826                 {
 827                         IList<MemberSpec> found = null;
 828
 829                         IList<MemberSpec> applicable;
 830                         do {
 831                                 var mc = container.MemberCache;
 832
 833                                 if (((op == Operator.OpType.Implicit || op == Operator.OpType.Explicit) && (mc.state & StateFlags.HasConversionOperator) != 0) ||
 834                                          (mc.state & StateFlags.HasUserOperator) != 0) {
 835
 836                                         if (mc.member_hash.TryGetValue (Operator.GetMetadataName (op), out applicable)) {
 837                                                 int i;
 838                                                 for (i = 0; i < applicable.Count; ++i) {
 839                                                         if (applicable[i].Kind != MemberKind.Operator) {
 840                                                                 break;
 841                                                         }
 842                                                 }
 843
 844                                                 //
 845                                                 // Handles very rare case where a method with same name as operator (op_xxxx) exists
 846                                                 // and we have to resize the applicable list
 847                                                 //
 848                                                 if (i != applicable.Count) {
 849                                                         for (i = 0; i < applicable.Count; ++i) {
 850                                                                 if (applicable[i].Kind != MemberKind.Operator) {
 851                                                                         continue;
 852                                                                 }
 853
 854                                                                 if (found == null) {
 855                                                                         found = new List<MemberSpec> ();
 856                                                                         found.Add (applicable[i]);
 857                                                                 } else {
 858                                                                         var prev = found as List<MemberSpec>;
 859                                                                         if (prev == null) {
 860                                                                                 prev = new List<MemberSpec> (found.Count + 1);
 861                                                                                 prev.AddRange (found);
 862                                                                         }
 863
 864                                                                         prev.Add (applicable[i]);
 865                                                                 }
 866                                                         }
 867                                                 } else {
 868                                                         if (found == null) {
 869                                                                 found = applicable;
 870                                                         } else {
 871                                                                 var merged = found as List<MemberSpec>;
 872                                                                 if (merged == null) {
 873                                                                         merged = new List<MemberSpec> (found.Count + applicable.Count);
 874                                                                         merged.AddRange (found);
 875                                                                         found = merged;
 876                                                                 }
 877
 878                                                                 merged.AddRange (applicable);
 879                                                         }
 880                                                 }
 881                                         }
 882                                 }
 883
 884                                 // BaseType call can be expensive
 885                                 if (declaredOnly)
 886                                         break;
 887
 888                                 container = container.BaseType;
 889                         } while (container != null);
 890
 891                         return found;
 892                 }
 893
 894                 //
 895                 // Inflates all member cache nested types
 896                 //
 897                 public void InflateTypes (MemberCache inflated_cache, TypeParameterInflator inflator)
 898                 {
 899                         foreach (var item in member_hash) {
 900                                 IList<MemberSpec> inflated_members = null;
 901                                 for (int i = 0; i < item.Value.Count; ++i ) {
 902                                         var member = item.Value[i];
 903
 904                                         // FIXME: When inflating members refering nested types before they are inflated
 905                                         if (member == null)
 906                                                 continue;
 907
 908                                         if ((member.Kind & MemberKind.NestedMask) != 0 &&
 909                                                 (member.Modifiers & Modifiers.COMPILER_GENERATED) == 0) {
 910                                                 if (inflated_members == null) {
 911                                                         inflated_members = new MemberSpec[item.Value.Count];
 912                                                         inflated_cache.member_hash.Add (item.Key, inflated_members);
 913                                                 }
 914
 915                                                 inflated_members [i] = member.InflateMember (inflator);
 916                                         }
 917                                 }
 918                         }
 919                 }
 920
 921                 //
 922                 // Inflates all open type members, requires InflateTypes to be called before
 923                 //
 924                 public void InflateMembers (MemberCache cacheToInflate, TypeSpec inflatedType, TypeParameterInflator inflator)
 925                 {
 926                         var inflated_member_hash = cacheToInflate.member_hash;
 927                         Dictionary<MemberSpec, MethodSpec> accessor_relation = null;
 928                         List<MemberSpec> accessor_members = null;
 929
 930                         // Copy member specific flags when all members were added
 931                         cacheToInflate.state = state;
 932
 933                         foreach (var item in member_hash) {
 934                                 var members = item.Value;
 935                                 IList<MemberSpec> inflated_members = null;
 936                                 for (int i = 0; i < members.Count; ++i ) {
 937                                         var member = members[i];
 938
 939                                         //
 940                                         // All nested types have been inflated earlier except for
 941                                         // compiler types which are created later and could miss InflateTypes
 942                                         //
 943                                         if ((member.Kind & MemberKind.NestedMask) != 0 &&
 944                                                 (member.Modifiers & Modifiers.COMPILER_GENERATED) == 0) {
 945                                                 if (inflated_members == null)
 946                                                         inflated_members = inflated_member_hash[item.Key];
 947
 948                                                 continue;
 949                                         }
 950
 951                                         //
 952                                         // Clone the container first
 953                                         //
 954                                         if (inflated_members == null) {
 955                                                 inflated_members = new MemberSpec [item.Value.Count];
 956                                                 inflated_member_hash.Add (item.Key, inflated_members);
 957                                         }
 958
 959                                         var local_inflator = inflator;
 960
 961                                         if (member.DeclaringType != inflatedType) {
 962                                                 //
 963                                                 // Don't inflate top-level non-generic interface members
 964                                                 // merged into generic interface
 965                                                 //
 966                                                 if (!member.DeclaringType.IsGeneric && !member.DeclaringType.IsNested) {
 967                                                         inflated_members [i] = member;
 968                                                         continue;
 969                                                 }
 970
 971                                                 //
 972                                                 // Needed when inflating flatten interfaces. It inflates
 973                                                 // container type only, type parameters are already done
 974                                                 //
 975                                                 // Handles cases like:
 976                                                 //
 977                                                 // interface I<T> {}
 978                                                 // interface I<U, V> : I<U> {}
 979                                                 //
 980                                                 // class C: I<int, bool> {}
 981                                                 //
 982                                                 var inflated_parent = inflator.Inflate (member.DeclaringType);
 983                                                 if (inflated_parent != inflator.TypeInstance)
 984                                                         local_inflator = new TypeParameterInflator (inflator, inflated_parent);
 985                                         }
 986
 987                                         //
 988                                         // Inflate every member, its parent is now different
 989                                         //
 990                                         var inflated = member.InflateMember (local_inflator);
 991                                         inflated_members [i] = inflated;
 992
 993                                         if (member is PropertySpec || member is EventSpec) {
 994                                                 if (accessor_members == null)
 995                                                         accessor_members = new List<MemberSpec> ();
 996
 997                                                 accessor_members.Add (inflated);
 998                                                 continue;
 999                                         }
1000
1001                                         if (member.IsAccessor) {
1002                                                 if (accessor_relation == null)
1003                                                         accessor_relation = new Dictionary<MemberSpec, MethodSpec> ();
1004                                                 accessor_relation.Add (member, (MethodSpec) inflated);
1005                                         }
1006                                 }
1007                         }
1008
1009                         if (accessor_members != null) {
1010                                 foreach (var member in accessor_members) {
1011                                         var prop = member as PropertySpec;
1012                                         if (prop != null) {
1013                                                 if (prop.Get != null)
1014                                                         prop.Get = accessor_relation[prop.Get];
1015                                                 if (prop.Set != null)
1016                                                         prop.Set = accessor_relation[prop.Set];
1017
1018                                                 continue;
1019                                         }
1020
1021                                         var ev = (EventSpec) member;
1022                                         ev.AccessorAdd = accessor_relation[ev.AccessorAdd];
1023                                         ev.AccessorRemove = accessor_relation[ev.AccessorRemove];
1024                                 }
1025                         }
1026                 }
1027
1028                 //
1029                 // Checks all appropriate container members for CLS compliance
1030                 //
1031                 public void VerifyClsCompliance (TypeSpec container, Report report)
1032                 {
1033                         if (locase_members != null)
1034                                 return;
1035
1036                         if (container.BaseType == null) {
1037                                 locase_members = new Dictionary<string, MemberSpec[]> (member_hash.Count); // StringComparer.OrdinalIgnoreCase);
1038                         } else {
1039                                 container.BaseType.MemberCache.VerifyClsCompliance (container.BaseType, report);
1040                                 locase_members = new Dictionary<string, MemberSpec[]> (container.BaseType.MemberCache.locase_members); //, StringComparer.OrdinalIgnoreCase);
1041                         }
1042
1043                         var is_imported_type = container.MemberDefinition.IsImported;
1044                         foreach (var entry in container.MemberCache.member_hash) {
1045                                 for (int i = 0; i < entry.Value.Count; ++i ) {
1046                                         var name_entry = entry.Value[i];
1047                                         if ((name_entry.Modifiers & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
1048                                                 continue;
1049
1050                                         if ((name_entry.Modifiers & (Modifiers.OVERRIDE | Modifiers.COMPILER_GENERATED)) != 0)
1051                                                 continue;
1052
1053                                         if ((name_entry.Kind & MemberKind.MaskType) == 0)
1054                                                 continue;
1055
1056                                         if (name_entry.MemberDefinition.IsNotCLSCompliant ())
1057                                             continue;
1058
1059                                         IParametersMember p_a = name_entry as IParametersMember;
1060                                         if (p_a != null && !name_entry.IsAccessor) {
1061                                                 if (!is_imported_type) {
1062                                                         var p_a_pd = p_a.Parameters;
1063                                                         for (int ii = i + 1; ii < entry.Value.Count; ++ii) {
1064                                                                 var checked_entry = entry.Value[ii];
1065                                                                 IParametersMember p_b = checked_entry as IParametersMember;
1066                                                                 if (p_b == null)
1067                                                                         continue;
1068
1069                                                                 if (p_a_pd.Count != p_b.Parameters.Count)
1070                                                                         continue;
1071
1072                                                                 if (checked_entry.IsAccessor)
1073                                                                         continue;
1074
1075                                                                 var res = ParametersCompiled.IsSameClsSignature (p_a.Parameters, p_b.Parameters);
1076                                                                 if (res != 0) {
1077                                                                         var last = GetLaterDefinedMember (checked_entry, name_entry);
1078                                                                         if (last == checked_entry.MemberDefinition) {
1079                                                                                 report.SymbolRelatedToPreviousError (name_entry);
1080                                                                         } else {
1081                                                                                 report.SymbolRelatedToPreviousError (checked_entry);
1082                                                                         }
1083
1084                                                                         if ((res & 1) != 0) {
1085                                                                                 report.Warning (3006, 1, last.Location,
1086                                                                                                 "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant",
1087                                                                                                 name_entry.GetSignatureForError ());
1088                                                                         }
1089
1090                                                                         if ((res & 2) != 0) {
1091                                                                                 report.Warning (3007, 1, last.Location,
1092                                                                                         "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant",
1093                                                                                         name_entry.GetSignatureForError ());
1094                                                                         }
1095                                                                 }
1096                                                         }
1097                                                 }
1098                                         }
1099
1100                                         if (i > 0 || name_entry.Kind == MemberKind.Constructor || name_entry.Kind == MemberKind.Indexer)
1101                                                 continue;
1102
1103                                         var name_entry_locase = name_entry.Name.ToLowerInvariant ();
1104
1105                                         MemberSpec[] found;
1106                                         if (!locase_members.TryGetValue (name_entry_locase, out found)) {
1107                                                 found = new MemberSpec[] { name_entry };
1108                                                 locase_members.Add (name_entry_locase, found);
1109                                         } else {
1110                                                 bool same_names_only = true;
1111                                                 foreach (var f in found) {
1112                                                         if (f.Name == name_entry.Name)
1113                                                                 continue;
1114
1115 //                                                      if (f.IsAccessor && name_entry.IsAccessor)
1116 //                                                              continue;
1117
1118                                                         same_names_only = false;
1119                                                         if (!is_imported_type) {
1120                                                                 var last = GetLaterDefinedMember (f, name_entry);
1121                                                                 if (last == f.MemberDefinition) {
1122                                                                         report.SymbolRelatedToPreviousError (name_entry);
1123                                                                 } else {
1124                                                                         report.SymbolRelatedToPreviousError (f);
1125                                                                 }
1126
1127                                                                 report.Warning (3005, 1, last.Location,
1128                                                                         "Identifier `{0}' differing only in case is not CLS-compliant", last.GetSignatureForError ());
1129                                                         }
1130                                                 }
1131
1132                                                 if (!same_names_only) {
1133                                                         Array.Resize (ref found, found.Length + 1);
1134                                                         found[found.Length - 1] = name_entry;
1135                                                         locase_members[name_entry_locase] = found;
1136                                                 }
1137                                         }
1138                                 }
1139                         }
1140                 }
1141
1142                 //
1143                 // Local report helper to issue correctly ordered members stored in hashtable
1144                 //
1145                 static MemberCore GetLaterDefinedMember (MemberSpec a, MemberSpec b)
1146                 {
1147                         var mc_a = a.MemberDefinition as MemberCore;
1148                         var mc_b = b.MemberDefinition as MemberCore;
1149                         if (mc_a == null)
1150                                 return mc_b;
1151
1152                         if (mc_b == null)
1153                                 return mc_a;
1154
1155                         if (mc_a.Location.File != mc_a.Location.File)
1156                                 return mc_b;
1157
1158                         return mc_b.Location.Row > mc_a.Location.Row ? mc_b : mc_a;
1159                 }
1160
1161                 public bool CheckExistingMembersOverloads (MemberCore member, AParametersCollection parameters)
1162                 {
1163                         var name = GetLookupName (member);
1164                         var imb = member as InterfaceMemberBase;
1165                         if (imb != null && imb.IsExplicitImpl) {
1166                                 name = imb.GetFullName (name);
1167                         }
1168
1169                         return CheckExistingMembersOverloads (member, name, parameters);
1170                 }
1171
1172                 public bool CheckExistingMembersOverloads (MemberCore member, string name, AParametersCollection parameters)
1173                 {
1174                         IList<MemberSpec> entries;
1175                         if (!member_hash.TryGetValue (name, out entries))
1176                                 return false;
1177
1178                         var Report = member.Compiler.Report;
1179
1180                         int method_param_count = parameters.Count;
1181                         for (int i = entries.Count - 1; i >= 0; --i) {
1182                                 var ce = entries[i];
1183                                 var pm = ce as IParametersMember;
1184                                 var pd = pm == null ? ParametersCompiled.EmptyReadOnlyParameters : pm.Parameters;
1185                                 if (pd.Count != method_param_count)
1186                                         continue;
1187
1188                                 if (ce.Arity != member.MemberName.Arity)
1189                                         continue;
1190
1191                                 // Ignore merged interface members
1192                                 if (member.Parent.PartialContainer != ce.DeclaringType.MemberDefinition)
1193                                         continue;
1194
1195                                 var p_types = pd.Types;
1196                                 if (method_param_count > 0) {
1197                                         int ii = method_param_count - 1;
1198                                         TypeSpec type_a, type_b;
1199                                         do {
1200                                                 type_a = parameters.Types [ii];
1201                                                 type_b = p_types [ii];
1202
1203                                                 if ((pd.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF) !=
1204                                                         (parameters.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF))
1205                                                         break;
1206
1207                                         } while (TypeSpecComparer.Override.IsEqual (type_a, type_b) && ii-- != 0);
1208
1209                                         if (ii >= 0)
1210                                                 continue;
1211
1212                                         //
1213                                         // Operators can differ in return type only
1214                                         //
1215                                         if (member is Operator && ce.Kind == MemberKind.Operator && ((MethodSpec) ce).ReturnType != ((Operator) member).ReturnType)
1216                                                 continue;
1217
1218                                         //
1219                                         // Report difference in parameter modifiers only
1220                                         //
1221                                         if (pd != null && member is MethodCore) {
1222                                                 ii = method_param_count;
1223                                                 while (ii-- != 0 && parameters.FixedParameters[ii].ModFlags == pd.FixedParameters[ii].ModFlags &&
1224                                                         parameters.ExtensionMethodType == pd.ExtensionMethodType) ;
1225
1226                                                 if (ii >= 0) {
1227                                                         var mc = ce as MethodSpec;
1228                                                         member.Compiler.Report.SymbolRelatedToPreviousError (ce);
1229                                                         if ((member.ModFlags & Modifiers.PARTIAL) != 0 && (mc.Modifiers & Modifiers.PARTIAL) != 0) {
1230                                                                 if (parameters.HasParams || pd.HasParams) {
1231                                                                         Report.Error (758, member.Location,
1232                                                                                 "A partial method declaration and partial method implementation cannot differ on use of `params' modifier");
1233                                                                 } else {
1234                                                                         Report.Error (755, member.Location,
1235                                                                                 "A partial method declaration and partial method implementation must be both an extension method or neither");
1236                                                                 }
1237                                                         } else if (member is Constructor) {
1238                                                                 Report.Error (851, member.Location,
1239                                                                         "Overloaded contructor `{0}' cannot differ on use of parameter modifiers only",
1240                                                                         member.GetSignatureForError ());
1241                                                         } else {
1242                                                                 Report.Error (663, member.Location,
1243                                                                         "Overloaded method `{0}' cannot differ on use of parameter modifiers only",
1244                                                                         member.GetSignatureForError ());
1245                                                         }
1246                                                         return false;
1247                                                 }
1248                                         }
1249                                 }
1250
1251                                 if ((ce.Kind & MemberKind.Method) != 0) {
1252                                         Method method_a = member as Method;
1253                                         Method method_b = ce.MemberDefinition as Method;
1254                                         if (method_a != null && method_b != null && (method_a.ModFlags & method_b.ModFlags & Modifiers.PARTIAL) != 0) {
1255                                                 const Modifiers partial_modifiers = Modifiers.STATIC | Modifiers.UNSAFE;
1256                                                 if (method_a.IsPartialDefinition == method_b.IsPartialImplementation) {
1257                                                         if ((method_a.ModFlags & partial_modifiers) == (method_b.ModFlags & partial_modifiers) ||
1258                                                                 method_a.Parent.IsUnsafe && method_b.Parent.IsUnsafe) {
1259                                                                 if (method_a.IsPartialImplementation) {
1260                                                                         method_a.SetPartialDefinition (method_b);
1261                                                                         if (entries.Count == 1)
1262                                                                                 member_hash.Remove (name);
1263                                                                         else
1264                                                                                 entries.RemoveAt (i);
1265                                                                 } else {
1266                                                                         method_b.SetPartialDefinition (method_a);
1267                                                                         method_a.caching_flags |= MemberCore.Flags.PartialDefinitionExists;
1268                                                                 }
1269                                                                 continue;
1270                                                         }
1271
1272                                                         if (method_a.IsStatic != method_b.IsStatic) {
1273                                                                 Report.SymbolRelatedToPreviousError (ce);
1274                                                                 Report.Error (763, member.Location,
1275                                                                         "A partial method declaration and partial method implementation must be both `static' or neither");
1276                                                         }
1277
1278                                                         Report.SymbolRelatedToPreviousError (ce);
1279                                                         Report.Error (764, member.Location,
1280                                                                 "A partial method declaration and partial method implementation must be both `unsafe' or neither");
1281                                                         return false;
1282                                                 }
1283
1284                                                 Report.SymbolRelatedToPreviousError (ce);
1285                                                 if (method_a.IsPartialDefinition) {
1286                                                         Report.Error (756, member.Location, "A partial method `{0}' declaration is already defined",
1287                                                                 member.GetSignatureForError ());
1288                                                 }
1289
1290                                                 Report.Error (757, member.Location, "A partial method `{0}' implementation is already defined",
1291                                                         member.GetSignatureForError ());
1292                                                 return false;
1293                                         }
1294
1295                                         Report.SymbolRelatedToPreviousError (ce);
1296
1297                                         bool is_reserved_a = member is AbstractPropertyEventMethod || member is Operator;
1298                                         bool is_reserved_b = ((MethodSpec) ce).IsReservedMethod;
1299
1300                                         if (is_reserved_a || is_reserved_b) {
1301                                                 Report.Error (82, member.Location, "A member `{0}' is already reserved",
1302                                                         is_reserved_a ?
1303                                                         ce.GetSignatureForError () :
1304                                                         member.GetSignatureForError ());
1305                                                 return false;
1306                                         }
1307                                 } else {
1308                                         Report.SymbolRelatedToPreviousError (ce);
1309                                 }
1310
1311                                 if (member is Operator && ce.Kind == MemberKind.Operator) {
1312                                         Report.Error (557, member.Location, "Duplicate user-defined conversion in type `{0}'",
1313                                                 member.Parent.GetSignatureForError ());
1314                                         return false;
1315                                 }
1316
1317                                 Report.Error (111, member.Location,
1318                                         "A member `{0}' is already defined. Rename this member or use different parameter types",
1319                                         member.GetSignatureForError ());
1320                                 return false;
1321                         }
1322
1323                         return true;
1324                 }
1325         }
1326 }