mcs/mcs/membercache.cs

   1 //
   2 // membercache.cs: A container for all member lookups
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Marek Safar (marek.safar@gmail.com)
   6 //
   7 // Dual licensed under the terms of the MIT X11 or GNU GPL
   8 //
   9 // Copyright 2001 Ximian, Inc (http://www.ximian.com)
  10 // Copyright 2004-2010 Novell, Inc
  11 //
  12 //
  13
  14 using System;
  15 using System.Collections.Generic;
  16
  17 namespace Mono.CSharp {
  18
  19         [Flags]
  20         public enum MemberKind
  21         {
  22                 Constructor = 1,
  23                 Event = 1 << 1,
  24                 Field = 1 << 2,
  25                 Method = 1 << 3,
  26                 Property = 1 << 4,
  27                 Indexer = 1 << 5,
  28                 Operator = 1 << 6,
  29                 Destructor      = 1 << 7,
  30
  31                 Class           = 1 << 11,
  32                 Struct          = 1 << 12,
  33                 Delegate        = 1 << 13,
  34                 Enum            = 1 << 14,
  35                 Interface       = 1 << 15,
  36                 TypeParameter = 1 << 16,
  37
  38                 ArrayType = 1 << 19,
  39                 PointerType = 1 << 20,
  40                 InternalCompilerType = 1 << 21,
  41                 MissingType = 1 << 22,
  42                 Void = 1 << 23,
  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         }
  48
  49         [Flags]
  50         public enum BindingRestriction
  51         {
  52                 None = 0,
  53
  54                 // Inspect only queried type members
  55                 DeclaredOnly = 1 << 1,
  56
  57                 // Exclude static
  58                 InstanceOnly = 1 << 2,
  59
  60                 NoAccessors = 1 << 3,
  61
  62                 // Member has to be override
  63                 OverrideOnly = 1 << 4
  64         }
  65
  66         public struct MemberFilter : IEquatable<MemberSpec>
  67         {
  68                 public readonly string Name;
  69                 public readonly MemberKind Kind;
  70                 public readonly AParametersCollection Parameters;
  71                 public readonly TypeSpec MemberType;
  72
  73                 int arity; // -1 to ignore the check
  74
  75                 private MemberFilter (string name, MemberKind kind)
  76                 {
  77                         Name = name;
  78                         Kind = kind;
  79                         Parameters = null;
  80                         MemberType = null;
  81                         arity = -1;
  82                 }
  83
  84                 public MemberFilter (MethodSpec m)
  85                 {
  86                         Name = m.Name;
  87                         Kind = MemberKind.Method;
  88                         Parameters = m.Parameters;
  89                         MemberType = m.ReturnType;
  90                         arity = m.Arity;
  91                 }
  92
  93                 public MemberFilter (string name, int arity, MemberKind kind, AParametersCollection param, TypeSpec type)
  94                 {
  95                         Name = name;
  96                         Kind = kind;
  97                         Parameters = param;
  98                         MemberType = type;
  99                         this.arity = arity;
 100                 }
 101
 102                 public static MemberFilter Constructor (AParametersCollection param)
 103                 {
 104                         return new MemberFilter (Mono.CSharp.Constructor.ConstructorName, 0, MemberKind.Constructor, param, null);
 105                 }
 106
 107                 public static MemberFilter Property (string name, TypeSpec type)
 108                 {
 109                         return new MemberFilter (name, 0, MemberKind.Property, null, type);
 110                 }
 111
 112                 public static MemberFilter Field (string name, TypeSpec type)
 113                 {
 114                         return new MemberFilter (name, 0, MemberKind.Field, null, type);
 115                 }
 116
 117                 public static MemberFilter Method (string name, int arity, AParametersCollection param, TypeSpec type)
 118                 {
 119                         return new MemberFilter (name, arity, MemberKind.Method, param, type);
 120                 }
 121
 122                 #region IEquatable<MemberSpec> Members
 123
 124                 public bool Equals (MemberSpec other)
 125                 {
 126                         // Is the member of the correct type ?
 127                         // TODO: Isn't this redundant ?
 128                         if ((other.Kind & Kind & MemberKind.MaskType) == 0)
 129                                 return false;
 130
 131                         // Check arity when not disabled
 132                         if (arity >= 0 && arity != other.Arity)
 133                                 return false;
 134
 135                         if (Parameters != null) {
 136                                 if (other is IParametersMember) {
 137                                         var other_param = ((IParametersMember) other).Parameters;
 138                                         if (!TypeSpecComparer.Override.IsEqual (Parameters, other_param))
 139                                                 return false;
 140                                 } else {
 141                                         return false;
 142                                 }
 143                         }
 144
 145                         if (MemberType != null) {
 146                                 if (other is IInterfaceMemberSpec) {
 147                                         var other_type = ((IInterfaceMemberSpec) other).MemberType;
 148                                         if (!TypeSpecComparer.Override.IsEqual (other_type, MemberType))
 149                                                 return false;
 150                                 } else {
 151                                         return false;
 152                                 }
 153                         }
 154
 155                         return true;
 156                 }
 157
 158                 #endregion
 159         }
 160
 161         //
 162         // The MemberCache is the main members container used by compiler. It contains
 163         // all members imported or defined during compilation using on demand filling
 164         // process. Inflated containers are also using MemberCache to make inflated
 165         // members look like normal definition.
 166         //
 167         // All of the methods are performance and memory sensitive as the MemberCache
 168         // is the underlying engine of all member based operations.
 169         //
 170         public class MemberCache
 171         {
 172                 [Flags]
 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                 // For cases where we need to union cache members
 214                 //
 215                 public void AddBaseType (TypeSpec baseType)
 216                 {
 217                         var cache = baseType.MemberCache;
 218
 219                         IList<MemberSpec> list;
 220                         foreach (var entry in cache.member_hash) {
 221                                 if (!member_hash.TryGetValue (entry.Key, out list)) {
 222                                         if (entry.Value.Count == 1) {
 223                                                 list = entry.Value;
 224                                         } else {
 225                                                 list = new List<MemberSpec> (entry.Value);
 226                                         }
 227
 228                                         member_hash.Add (entry.Key, list);
 229                                         continue;
 230                                 }
 231
 232                                 foreach (var ce in entry.Value) {
 233                                         if (list.Contains (ce))
 234                                                 continue;
 235
 236                                         if (list is MemberSpec[]) {
 237                                                 list = new List<MemberSpec> () { list [0] };
 238                                                 member_hash[entry.Key] = list;
 239                                         }
 240
 241                                         list.Add (ce);
 242                                 }
 243                         }
 244                 }
 245
 246                 //
 247                 // Member-cache does not contain base members but it does
 248                 // contain all base interface members, so the Lookup code
 249                 // can use simple inheritance rules.
 250                 //
 251                 public void AddInterface (TypeSpec iface)
 252                 {
 253                         var cache = iface.MemberCache;
 254
 255                         IList<MemberSpec> list;
 256                         foreach (var entry in cache.member_hash) {
 257                                 if (!member_hash.TryGetValue (entry.Key, out list)) {
 258                                         if (entry.Value.Count == 1) {
 259                                                 list = entry.Value;
 260                                         } else {
 261                                                 list = new List<MemberSpec> (entry.Value);
 262                                         }
 263
 264                                         member_hash.Add (entry.Key, list);
 265                                         continue;
 266                                 }
 267
 268                                 foreach (var ce in entry.Value) {
 269                                         if (list.Contains (ce))
 270                                                 continue;
 271
 272                                         if (AddInterfaceMember (ce, ref list))
 273                                                 member_hash[entry.Key] = list;
 274                                 }
 275                         }
 276
 277                         // Add also all base interfaces
 278                         if (iface.Interfaces != null) {
 279                                 foreach (var base_iface in iface.Interfaces)
 280                                         AddInterface (base_iface);
 281                         }
 282                 }
 283
 284                 public void AddMember (InterfaceMemberBase imb, string exlicitName, MemberSpec ms)
 285                 {
 286                         // Explicit names cannot be looked-up but can be used for
 287                         // collision checking (no name mangling needed)
 288                         if (imb.IsExplicitImpl)
 289                                 AddMember (exlicitName, ms, false);
 290                         else
 291                                 AddMember (ms);
 292                 }
 293
 294                 //
 295                 // Add non-explicit member to member cache
 296                 //
 297                 public void AddMember (MemberSpec ms)
 298                 {
 299                         AddMember (GetLookupName (ms), ms, false);
 300                 }
 301
 302                 void AddMember (string name, MemberSpec member, bool removeHiddenMembers)
 303                 {
 304                         if (member.Kind == MemberKind.Operator) {
 305                                 var dt = member.DeclaringType;
 306                                 switch (dt.BuildinType) {
 307                                 case BuildinTypeSpec.Type.String:
 308                                 case BuildinTypeSpec.Type.Delegate:
 309                                 case BuildinTypeSpec.Type.MulticastDelegate:
 310                                         // Some core types have user operators but they cannot be used as normal
 311                                         // user operators as they are predefined and therefore having different
 312                                         // rules (e.g. binary operators) by not setting the flag we hide them for
 313                                         // user conversions
 314                                         // TODO: Should I do this for all core types ?
 315                                         break;
 316                                 default:
 317                                         if (name == Operator.GetMetadataName (Operator.OpType.Implicit) || name == Operator.GetMetadataName (Operator.OpType.Explicit)) {
 318                                                 state |= StateFlags.HasConversionOperator;
 319                                         } else {
 320                                                 state |= StateFlags.HasUserOperator;
 321                                         }
 322
 323                                         break;
 324                                 }
 325                         }
 326
 327                         IList<MemberSpec> list;
 328                         if (!member_hash.TryGetValue (name, out list)) {
 329                                 member_hash.Add (name, new MemberSpec[] { member });
 330                                 return;
 331                         }
 332
 333                         if (removeHiddenMembers && member.DeclaringType.IsInterface) {
 334                                 if (AddInterfaceMember (member, ref list))
 335                                         member_hash[name] = list;
 336                         } else {
 337                                 if (list.Count == 1) {
 338                                         list = new List<MemberSpec> () { list[0] };
 339                                         member_hash[name] = list;
 340                                 }
 341
 342                                 list.Add (member);
 343                         }
 344                 }
 345
 346                 public void AddMemberImported (MemberSpec ms)
 347                 {
 348                         AddMember (GetLookupName (ms), ms, true);
 349                 }
 350
 351                 //
 352                 // Ignores any base interface member which can be hidden
 353                 // by this interface
 354                 //
 355                 static bool AddInterfaceMember (MemberSpec member, ref IList<MemberSpec> existing)
 356                 {
 357                         var member_param = member is IParametersMember ? ((IParametersMember) member).Parameters : ParametersCompiled.EmptyReadOnlyParameters;
 358
 359                         //
 360                         // interface IA : IB { int Prop { set; } }
 361                         // interface IB { bool Prop { get; } }
 362                         //
 363                         // IB.Prop is never accessible from IA interface
 364                         //
 365                         for (int i = 0; i < existing.Count; ++i) {
 366                                 var entry = existing[i];
 367
 368                                 if (entry.Arity != member.Arity)
 369                                         continue;
 370
 371                                 if (entry is IParametersMember) {
 372                                         var entry_param = ((IParametersMember) entry).Parameters;
 373                                         if (!TypeSpecComparer.Override.IsEqual (entry_param, member_param))
 374                                                 continue;
 375                                 }
 376
 377                                 if (member.DeclaringType.ImplementsInterface (entry.DeclaringType, false)) {
 378                                         if (existing.Count == 1) {
 379                                                 existing = new MemberSpec[] { member };
 380                                                 return true;
 381                                         }
 382
 383                                         existing.RemoveAt (i--);
 384                                         continue;
 385                                 }
 386
 387                                 if ((entry.DeclaringType == member.DeclaringType && entry.IsAccessor == member.IsAccessor) ||
 388                                         entry.DeclaringType.ImplementsInterface (member.DeclaringType, false))
 389                                         return false;
 390                         }
 391
 392                         if (existing.Count == 1) {
 393                                 existing = new List<MemberSpec> () { existing[0], member };
 394                                 return true;
 395                         }
 396
 397                         existing.Add (member);
 398                         return false;
 399                 }
 400
 401                 public static MemberSpec FindMember (TypeSpec container, MemberFilter filter, BindingRestriction restrictions)
 402                 {
 403                         do {
 404                                 IList<MemberSpec> applicable;
 405                                 if (container.MemberCache.member_hash.TryGetValue (filter.Name, out applicable)) {
 406                                         // Start from the end because interface members are in reverse order
 407                                         for (int i = applicable.Count - 1; i >= 0; i--) {
 408                                                 var entry = applicable [i];
 409
 410                                                 if ((restrictions & BindingRestriction.InstanceOnly) != 0 && entry.IsStatic)
 411                                                         continue;
 412
 413                                                 if ((restrictions & BindingRestriction.NoAccessors) != 0 && entry.IsAccessor)
 414                                                         continue;
 415
 416                                                 if ((restrictions & BindingRestriction.OverrideOnly) != 0 && (entry.Modifiers & Modifiers.OVERRIDE) == 0)
 417                                                         continue;
 418
 419                                                 if (!filter.Equals (entry))
 420                                                         continue;
 421
 422                                                 if ((restrictions & BindingRestriction.DeclaredOnly) != 0 && container.IsInterface && entry.DeclaringType != container)
 423                                                         continue;
 424
 425                                                 return entry;
 426                                         }
 427                                 }
 428
 429                                 if ((restrictions & BindingRestriction.DeclaredOnly) != 0)
 430                                         break;
 431
 432                                 container = container.BaseType;
 433                         } while (container != null);
 434
 435                         return null;
 436                 }
 437
 438                 //
 439                 // A special method to work with member lookup only. It returns a list of all members named @name
 440                 // starting from @container. It's very performance sensitive
 441                 //
 442                 public static IList<MemberSpec> FindMembers (TypeSpec container, string name, bool declaredOnly)
 443                 {
 444                         IList<MemberSpec> applicable;
 445
 446                         do {
 447                                 if (container.MemberCache.member_hash.TryGetValue (name, out applicable) || declaredOnly)
 448                                         return applicable;
 449
 450                                 container = container.BaseType;
 451                         } while (container != null);
 452
 453                         return null;
 454                 }
 455
 456                 //
 457                 // Finds the nested type in container
 458                 //
 459                 public static TypeSpec FindNestedType (TypeSpec container, string name, int arity)
 460                 {
 461                         IList<MemberSpec> applicable;
 462                         TypeSpec best_match = null;
 463                         do {
 464                                 // TODO: Don't know how to handle this yet
 465                                 // When resolving base type of nested type, parent type must have
 466                                 // base type resolved to scan full hierarchy correctly
 467                                 // Similarly MemberCacheTypes will inflate BaseType and Interfaces
 468                                 // based on type definition
 469                                 var tc = container.MemberDefinition as TypeContainer;
 470                                 if (tc != null)
 471                                         tc.DefineType ();
 472
 473                                 if (container.MemberCacheTypes.member_hash.TryGetValue (name, out applicable)) {
 474                                         for (int i = applicable.Count - 1; i >= 0; i--) {
 475                                                 var entry = applicable[i];
 476                                                 if ((entry.Kind & MemberKind.NestedMask) == 0)
 477                                                         continue;
 478
 479                                                 var ts = (TypeSpec) entry;
 480                                                 if (arity == ts.Arity)
 481                                                         return ts;
 482
 483                                                 if (arity < 0) {
 484                                                         if (best_match == null) {
 485                                                                 best_match = ts;
 486                                                         } else if (System.Math.Abs (ts.Arity + arity) < System.Math.Abs (ts.Arity + arity)) {
 487                                                                 best_match = ts;
 488                                                         }
 489                                                 }
 490                                         }
 491                                 }
 492
 493                                 container = container.BaseType;
 494                         } while (container != null);
 495
 496                         return best_match;
 497                 }
 498
 499                 //
 500                 // Looks for extension methods with defined name and extension type
 501                 //
 502                 public List<MethodSpec> FindExtensionMethods (TypeContainer invocationType, TypeSpec extensionType, string name, int arity)
 503                 {
 504                         IList<MemberSpec> entries;
 505                         if (!member_hash.TryGetValue (name, out entries))
 506                                 return null;
 507
 508                         List<MethodSpec> candidates = null;
 509                         foreach (var entry in entries) {
 510                                 if (entry.Kind != MemberKind.Method || (arity > 0 && entry.Arity != arity))
 511                                         continue;
 512
 513                                 var ms = (MethodSpec) entry;
 514                                 if (!ms.IsExtensionMethod)
 515                                         continue;
 516
 517                                 if (!ms.IsAccessible (invocationType.CurrentType))
 518                                         continue;
 519
 520                                 if ((ms.DeclaringType.Modifiers & Modifiers.INTERNAL) != 0 && !ms.DeclaringType.MemberDefinition.IsInternalAsPublic (invocationType.DeclaringAssembly))
 521                                         continue;
 522
 523                                 if (candidates == null)
 524                                         candidates = new List<MethodSpec> ();
 525                                 candidates.Add (ms);
 526                         }
 527
 528                         return candidates;
 529                 }
 530
 531                 //
 532                 // Returns base members of @member member if no exact match is found @bestCandidate returns
 533                 // the best match
 534                 //
 535                 public static MemberSpec FindBaseMember (MemberCore member, out MemberSpec bestCandidate)
 536                 {
 537                         bestCandidate = null;
 538                         var container = member.Parent.PartialContainer.Definition;
 539                         if (!container.IsInterface) {
 540                                 container = container.BaseType;
 541
 542                                 // It can happen for a user definition of System.Object
 543                                 if (container == null)
 544                                         return null;
 545                         }
 546
 547                         string name = GetLookupName (member);
 548                         IList<MemberSpec> applicable;
 549                         var member_param = member is IParametersMember ? ((IParametersMember) member).Parameters : null;
 550
 551                         var mkind = GetMemberCoreKind (member);
 552                         bool member_with_accessors = mkind == MemberKind.Indexer || mkind == MemberKind.Property;
 553
 554                         do {
 555                                 if (container.MemberCache.member_hash.TryGetValue (name, out applicable)) {
 556                                         for (int i = 0; i < applicable.Count; ++i) {
 557                                                 var entry = applicable [i];
 558
 559                                                 if ((entry.Modifiers & Modifiers.PRIVATE) != 0)
 560                                                         continue;
 561
 562                                                 if ((entry.Modifiers & Modifiers.AccessibilityMask) == Modifiers.INTERNAL &&
 563                                                         !entry.DeclaringType.MemberDefinition.IsInternalAsPublic (member.Module.DeclaringAssembly))
 564                                                         continue;
 565
 566                                                 //
 567                                                 // Isn't the member of same kind ?
 568                                                 //
 569                                                 if ((entry.Kind & ~MemberKind.Destructor & mkind & MemberKind.MaskType) == 0) {
 570                                                         // Destructors are ignored as they cannot be overridden by user
 571                                                         if ((entry.Kind & MemberKind.Destructor) != 0)
 572                                                                 continue;
 573
 574                                                         // A method with different arity does not hide base member
 575                                                         if (mkind != MemberKind.Method && member.MemberName.Arity != entry.Arity)
 576                                                                 continue;
 577
 578                                                         bestCandidate = entry;
 579                                                         return null;
 580                                                 }
 581
 582                                                 //
 583                                                 // Same kind of different arity is valid
 584                                                 //
 585                                                 if (member.MemberName.Arity != entry.Arity) {
 586                                                         continue;
 587                                                 }
 588
 589                                                 if ((entry.Kind & mkind & (MemberKind.Method | MemberKind.Indexer)) != 0) {
 590                                                         if (entry.IsAccessor != member is AbstractPropertyEventMethod)
 591                                                                 continue;
 592
 593                                                         var pm = entry as IParametersMember;
 594                                                         if (!TypeSpecComparer.Override.IsEqual (pm.Parameters, member_param))
 595                                                                 continue;
 596                                                 }
 597
 598                                                 //
 599                                                 // Skip override members with accessors they may not fully implement the base member
 600                                                 //
 601                                                 if (member_with_accessors) {
 602                                                         if ((entry.Modifiers & (Modifiers.OVERRIDE | Modifiers.SEALED)) == Modifiers.OVERRIDE) {
 603                                                                 //
 604                                                                 // Set candidate to member override to flag we found an implementation
 605                                                                 //
 606                                                                 bestCandidate = entry;
 607                                                                 continue;
 608                                                         }
 609                                                 } else {
 610                                                         bestCandidate = null;
 611                                                 }
 612
 613                                                 return entry;
 614                                         }
 615                                 }
 616
 617                                 if (container.IsInterface)
 618                                         break;
 619
 620                                 container = container.BaseType;
 621                         } while (container != null);
 622
 623                         return null;
 624                 }
 625
 626                 //
 627                 // Returns inflated version of MemberSpec, it works similarly to
 628                 // SRE TypeBuilder.GetMethod
 629                 //
 630                 public static T GetMember<T> (TypeSpec container, T spec) where T : MemberSpec
 631                 {
 632                         IList<MemberSpec> applicable;
 633                         if (container.MemberCache.member_hash.TryGetValue (GetLookupName (spec), out applicable)) {
 634                                 for (int i = applicable.Count - 1; i >= 0; i--) {
 635                                         var entry = applicable[i];
 636                                         if (entry.MemberDefinition == spec.MemberDefinition)
 637                                                 return (T) entry;
 638                                 }
 639                         }
 640
 641                         throw new InternalErrorException ("Missing member `{0}' on inflated type `{1}'",
 642                                 spec.GetSignatureForError (), container.GetSignatureForError ());
 643                 }
 644
 645                 static MemberKind GetMemberCoreKind (MemberCore member)
 646                 {
 647                         if (member is FieldBase)
 648                                 return MemberKind.Field;
 649                         if (member is Indexer)
 650                                 return MemberKind.Indexer;
 651                         if (member is Class)
 652                                 return MemberKind.Class;
 653                         if (member is Struct)
 654                                 return MemberKind.Struct;
 655                         if (member is Destructor)
 656                                 return MemberKind.Destructor;
 657                         if (member is Method)
 658                                 return MemberKind.Method;
 659                         if (member is Property)
 660                                 return MemberKind.Property;
 661                         if (member is EventField)
 662                                 return MemberKind.Event;
 663                         if (member is Interface)
 664                                 return MemberKind.Interface;
 665                         if (member is EventProperty)
 666                                 return MemberKind.Event;
 667                         if (member is Delegate)
 668                                 return MemberKind.Delegate;
 669                         if (member is Enum)
 670                                 return MemberKind.Enum;
 671
 672                         throw new NotImplementedException (member.GetType ().ToString ());
 673                 }
 674
 675                 public static IList<MemberSpec> GetCompletitionMembers (TypeSpec container, string name)
 676                 {
 677                         var matches = new List<MemberSpec> ();
 678                         foreach (var entry in container.MemberCache.member_hash) {
 679                                 foreach (var name_entry in entry.Value) {
 680                                         if (name_entry.IsAccessor)
 681                                                 continue;
 682
 683                                         if ((name_entry.Kind & (MemberKind.Constructor | MemberKind.Destructor | MemberKind.Operator)) != 0)
 684                                                 continue;
 685
 686                                         if (!name_entry.IsAccessible (InternalType.FakeInternalType))
 687                                                 continue;
 688
 689                                         if (name == null || name_entry.Name.StartsWith (name)) {
 690                                                 matches.Add (name_entry);
 691                                         }
 692                                 }
 693                         }
 694
 695                         return matches;
 696                 }
 697
 698                 //
 699                 // Returns members of @iface only, base members are ignored
 700                 //
 701                 public static IList<MethodSpec> GetInterfaceMethods (TypeSpec iface)
 702                 {
 703                         //
 704                         // MemberCache flatten interfaces, therefore in cases like this one
 705                         //
 706                         // interface IA : IB {}
 707                         // interface IB { void Foo () }
 708                         //
 709                         // we would return Foo inside IA which is not expected in this case
 710                         //
 711                         var methods = new List<MethodSpec> ();
 712                         foreach (var entry in iface.MemberCache.member_hash.Values) {
 713                                 foreach (var name_entry in entry) {
 714                                         if (iface == name_entry.DeclaringType) {
 715                                                 if (name_entry.Kind == MemberKind.Method) {
 716                                                         methods.Add ((MethodSpec) name_entry);
 717                                                 }
 718                                         }
 719                                 }
 720                         }
 721
 722                         return methods;
 723                 }
 724
 725                 //
 726                 // Returns all not implememted abstract members inside abstract type
 727                 // NOTE: Returned list is shared and must not be modified
 728                 //
 729                 public static IList<MethodSpec> GetNotImplementedAbstractMethods (TypeSpec type)
 730                 {
 731                         if (type.MemberCache.missing_abstract != null)
 732                                 return type.MemberCache.missing_abstract;
 733
 734                         var abstract_methods = new List<MethodSpec> ();
 735                         List<TypeSpec> hierarchy = null;
 736
 737                         //
 738                         // Stage 1: top-to-bottom scan for abstract members
 739                         //
 740                         var abstract_type = type;
 741                         while (true) {
 742                                 foreach (var entry in abstract_type.MemberCache.member_hash) {
 743                                         foreach (var name_entry in entry.Value) {
 744                                                 if ((name_entry.Modifiers & Modifiers.ABSTRACT) == 0)
 745                                                         continue;
 746
 747                                                 if (name_entry.Kind != MemberKind.Method)
 748                                                         continue;
 749
 750                                                 abstract_methods.Add ((MethodSpec) name_entry);
 751                                         }
 752                                 }
 753
 754                                 var base_type = abstract_type.BaseType;
 755                                 if (!base_type.IsAbstract)
 756                                         break;
 757
 758                                 if (hierarchy == null)
 759                                         hierarchy = new List<TypeSpec> ();
 760
 761                                 hierarchy.Add (abstract_type);
 762                                 abstract_type = base_type;
 763                         }
 764
 765                         int not_implemented_count = abstract_methods.Count;
 766                         if (not_implemented_count == 0 || hierarchy == null) {
 767                                 type.MemberCache.missing_abstract = abstract_methods;
 768                                 return type.MemberCache.missing_abstract;
 769                         }
 770
 771                         //
 772                         // Stage 2: Remove already implemented methods
 773                         //
 774                         foreach (var type_up in hierarchy) {
 775                                 var members = type_up.MemberCache.member_hash;
 776                                 if (members.Count == 0)
 777                                         continue;
 778
 779                                 for (int i = 0; i < abstract_methods.Count; ++i) {
 780                                         var candidate = abstract_methods [i];
 781                                         if (candidate == null)
 782                                                 continue;
 783
 784                                         IList<MemberSpec> applicable;
 785                                         if (!members.TryGetValue (candidate.Name, out applicable))
 786                                                 continue;
 787
 788                                         var filter = new MemberFilter (candidate);
 789                                         foreach (var item in applicable) {
 790                                                 if ((item.Modifiers & (Modifiers.OVERRIDE | Modifiers.VIRTUAL)) == 0)
 791                                                         continue;
 792
 793                                                 if (filter.Equals (item)) {
 794                                                         --not_implemented_count;
 795                                                         abstract_methods [i] = null;
 796                                                         break;
 797                                                 }
 798                                         }
 799                                 }
 800                         }
 801
 802                         if (not_implemented_count == abstract_methods.Count) {
 803                                 type.MemberCache.missing_abstract = abstract_methods;
 804                                 return type.MemberCache.missing_abstract;
 805                         }
 806
 807                         var not_implemented = new MethodSpec[not_implemented_count];
 808                         int counter = 0;
 809                         foreach (var m in abstract_methods) {
 810                                 if (m == null)
 811                                         continue;
 812
 813                                 not_implemented[counter++] = m;
 814                         }
 815
 816                         type.MemberCache.missing_abstract = not_implemented;
 817                         return type.MemberCache.missing_abstract;
 818                 }
 819
 820                 static string GetLookupName (MemberSpec ms)
 821                 {
 822                         if (ms.Kind == MemberKind.Indexer)
 823                                 return IndexerNameAlias;
 824
 825                         if (ms.Kind == MemberKind.Constructor) {
 826                                 if (ms.IsStatic)
 827                                         return Constructor.TypeConstructorName;
 828
 829                                 return Constructor.ConstructorName;
 830                         }
 831
 832                         return ms.Name;
 833                 }
 834
 835                 static string GetLookupName (MemberCore mc)
 836                 {
 837                         if (mc is Indexer)
 838                                 return IndexerNameAlias;
 839
 840                         if (mc is Constructor)
 841                                 return Constructor.ConstructorName;
 842
 843                         return mc.MemberName.Name;
 844                 }
 845
 846                 //
 847                 // Returns all operators declared on container and its base types (until declaredOnly is used)
 848                 //
 849                 public static IList<MemberSpec> GetUserOperator (TypeSpec container, Operator.OpType op, bool declaredOnly)
 850                 {
 851                         IList<MemberSpec> found = null;
 852
 853                         IList<MemberSpec> applicable;
 854                         do {
 855                                 var mc = container.MemberCache;
 856
 857                                 if (((op == Operator.OpType.Implicit || op == Operator.OpType.Explicit) && (mc.state & StateFlags.HasConversionOperator) != 0) ||
 858                                          (mc.state & StateFlags.HasUserOperator) != 0) {
 859
 860                                         if (mc.member_hash.TryGetValue (Operator.GetMetadataName (op), out applicable)) {
 861                                                 int i;
 862                                                 for (i = 0; i < applicable.Count; ++i) {
 863                                                         if (applicable[i].Kind != MemberKind.Operator) {
 864                                                                 break;
 865                                                         }
 866                                                 }
 867
 868                                                 //
 869                                                 // Handles very rare case where a method with same name as operator (op_xxxx) exists
 870                                                 // and we have to resize the applicable list
 871                                                 //
 872                                                 if (i != applicable.Count) {
 873                                                         for (i = 0; i < applicable.Count; ++i) {
 874                                                                 if (applicable[i].Kind != MemberKind.Operator) {
 875                                                                         continue;
 876                                                                 }
 877
 878                                                                 if (found == null) {
 879                                                                         found = new List<MemberSpec> ();
 880                                                                         found.Add (applicable[i]);
 881                                                                 } else {
 882                                                                         var prev = found as List<MemberSpec>;
 883                                                                         if (prev == null) {
 884                                                                                 prev = new List<MemberSpec> (found.Count + 1);
 885                                                                                 prev.AddRange (found);
 886                                                                         }
 887
 888                                                                         prev.Add (applicable[i]);
 889                                                                 }
 890                                                         }
 891                                                 } else {
 892                                                         if (found == null) {
 893                                                                 found = applicable;
 894                                                         } else {
 895                                                                 var merged = found as List<MemberSpec>;
 896                                                                 if (merged == null) {
 897                                                                         merged = new List<MemberSpec> (found.Count + applicable.Count);
 898                                                                         merged.AddRange (found);
 899                                                                         found = merged;
 900                                                                 }
 901
 902                                                                 merged.AddRange (applicable);
 903                                                         }
 904                                                 }
 905                                         }
 906                                 }
 907
 908                                 // BaseType call can be expensive
 909                                 if (declaredOnly)
 910                                         break;
 911
 912                                 container = container.BaseType;
 913                         } while (container != null);
 914
 915                         return found;
 916                 }
 917
 918                 //
 919                 // Inflates all member cache nested types
 920                 //
 921                 public void InflateTypes (MemberCache inflated_cache, TypeParameterInflator inflator)
 922                 {
 923                         foreach (var item in member_hash) {
 924                                 IList<MemberSpec> inflated_members = null;
 925                                 for (int i = 0; i < item.Value.Count; ++i ) {
 926                                         var member = item.Value[i];
 927
 928                                         // FIXME: When inflating members refering nested types before they are inflated
 929                                         if (member == null)
 930                                                 continue;
 931
 932                                         if ((member.Kind & MemberKind.NestedMask) != 0 &&
 933                                                 (member.Modifiers & Modifiers.COMPILER_GENERATED) == 0) {
 934                                                 if (inflated_members == null) {
 935                                                         inflated_members = new MemberSpec[item.Value.Count];
 936                                                         inflated_cache.member_hash.Add (item.Key, inflated_members);
 937                                                 }
 938
 939                                                 inflated_members [i] = member.InflateMember (inflator);
 940                                         }
 941                                 }
 942                         }
 943                 }
 944
 945                 //
 946                 // Inflates all open type members, requires InflateTypes to be called before
 947                 //
 948                 public void InflateMembers (MemberCache cacheToInflate, TypeSpec inflatedType, TypeParameterInflator inflator)
 949                 {
 950                         var inflated_member_hash = cacheToInflate.member_hash;
 951                         Dictionary<MemberSpec, MethodSpec> accessor_relation = null;
 952                         List<MemberSpec> accessor_members = null;
 953
 954                         // Copy member specific flags when all members were added
 955                         cacheToInflate.state = state;
 956
 957                         foreach (var item in member_hash) {
 958                                 var members = item.Value;
 959                                 IList<MemberSpec> inflated_members = null;
 960                                 for (int i = 0; i < members.Count; ++i ) {
 961                                         var member = members[i];
 962
 963                                         //
 964                                         // All nested types have been inflated earlier except for
 965                                         // compiler types which are created later and could miss InflateTypes
 966                                         //
 967                                         if ((member.Kind & MemberKind.NestedMask) != 0 &&
 968                                                 (member.Modifiers & Modifiers.COMPILER_GENERATED) == 0) {
 969                                                 if (inflated_members == null)
 970                                                         inflated_members = inflated_member_hash[item.Key];
 971
 972                                                 continue;
 973                                         }
 974
 975                                         //
 976                                         // Clone the container first
 977                                         //
 978                                         if (inflated_members == null) {
 979                                                 inflated_members = new MemberSpec [item.Value.Count];
 980                                                 inflated_member_hash.Add (item.Key, inflated_members);
 981                                         }
 982
 983                                         var local_inflator = inflator;
 984
 985                                         if (member.DeclaringType != inflatedType) {
 986                                                 //
 987                                                 // Don't inflate top-level non-generic interface members
 988                                                 // merged into generic interface
 989                                                 //
 990                                                 if (!member.DeclaringType.IsGeneric && !member.DeclaringType.IsNested) {
 991                                                         inflated_members [i] = member;
 992                                                         continue;
 993                                                 }
 994
 995                                                 //
 996                                                 // Needed when inflating flatten interfaces. It inflates
 997                                                 // container type only, type parameters are already done
 998                                                 //
 999                                                 // Handles cases like:
1000                                                 //
1001                                                 // interface I<T> {}
1002                                                 // interface I<U, V> : I<U> {}
1003                                                 //
1004                                                 // class C: I<int, bool> {}
1005                                                 //
1006                                                 var inflated_parent = inflator.Inflate (member.DeclaringType);
1007                                                 if (inflated_parent != inflator.TypeInstance)
1008                                                         local_inflator = new TypeParameterInflator (inflator, inflated_parent);
1009                                         }
1010
1011                                         //
1012                                         // Inflate every member, its parent is now different
1013                                         //
1014                                         var inflated = member.InflateMember (local_inflator);
1015                                         inflated_members [i] = inflated;
1016
1017                                         if (member is PropertySpec || member is EventSpec) {
1018                                                 if (accessor_members == null)
1019                                                         accessor_members = new List<MemberSpec> ();
1020
1021                                                 accessor_members.Add (inflated);
1022                                                 continue;
1023                                         }
1024
1025                                         if (member.IsAccessor) {
1026                                                 if (accessor_relation == null)
1027                                                         accessor_relation = new Dictionary<MemberSpec, MethodSpec> ();
1028                                                 accessor_relation.Add (member, (MethodSpec) inflated);
1029                                         }
1030                                 }
1031                         }
1032
1033                         if (accessor_members != null) {
1034                                 foreach (var member in accessor_members) {
1035                                         var prop = member as PropertySpec;
1036                                         if (prop != null) {
1037                                                 if (prop.Get != null)
1038                                                         prop.Get = accessor_relation[prop.Get];
1039                                                 if (prop.Set != null)
1040                                                         prop.Set = accessor_relation[prop.Set];
1041
1042                                                 continue;
1043                                         }
1044
1045                                         var ev = (EventSpec) member;
1046                                         ev.AccessorAdd = accessor_relation[ev.AccessorAdd];
1047                                         ev.AccessorRemove = accessor_relation[ev.AccessorRemove];
1048                                 }
1049                         }
1050                 }
1051
1052                 //
1053                 // Removes hidden base members of an interface. For compiled interfaces we cannot
1054                 // do name filtering during Add (as we do for import) because we need all base
1055                 // names to be valid during type definition.
1056                 // Add replaces hidden base member with current one which means any name collision
1057                 // (CS0108) of non-first name would be unnoticed because the name was replaced
1058                 // with the one from compiled type
1059                 //
1060                 public void RemoveHiddenMembers (TypeSpec container)
1061                 {
1062                         foreach (var entry in member_hash) {
1063                                 var values = entry.Value;
1064
1065                                 int container_members_start_at = 0;
1066                                 while (values[container_members_start_at].DeclaringType != container && ++container_members_start_at < entry.Value.Count);
1067
1068                                 if (container_members_start_at == 0 || container_members_start_at == values.Count)
1069                                         continue;
1070
1071                                 for (int i = 0; i < container_members_start_at; ++i) {
1072                                         var member = values[i];
1073
1074                                         if (!container.ImplementsInterface (member.DeclaringType, false))
1075                                                 continue;
1076
1077                                         var member_param = member is IParametersMember ? ((IParametersMember) member).Parameters : ParametersCompiled.EmptyReadOnlyParameters;
1078
1079                                         for (int ii = container_members_start_at; ii < values.Count; ++ii) {
1080                                                 var container_entry = values[ii];
1081
1082                                                 if (container_entry.Arity != member.Arity)
1083                                                         continue;
1084
1085                                                 if (container_entry is IParametersMember) {
1086                                                         if (!TypeSpecComparer.Override.IsEqual (((IParametersMember) container_entry).Parameters, member_param))
1087                                                                 continue;
1088                                                 }
1089
1090                                                 values.RemoveAt (i);
1091                                                 --container_members_start_at;
1092                                                 --ii;
1093                                                 --i;
1094                                         }
1095                                 }
1096                         }
1097                 }
1098
1099                 //
1100                 // Checks all appropriate container members for CLS compliance
1101                 //
1102                 public void VerifyClsCompliance (TypeSpec container, Report report)
1103                 {
1104                         if (locase_members != null)
1105                                 return;
1106
1107                         if (container.BaseType == null) {
1108                                 locase_members = new Dictionary<string, MemberSpec[]> (member_hash.Count); // StringComparer.OrdinalIgnoreCase);
1109                         } else {
1110                                 container.BaseType.MemberCache.VerifyClsCompliance (container.BaseType, report);
1111                                 locase_members = new Dictionary<string, MemberSpec[]> (container.BaseType.MemberCache.locase_members); //, StringComparer.OrdinalIgnoreCase);
1112                         }
1113
1114                         var is_imported_type = container.MemberDefinition.IsImported;
1115                         foreach (var entry in container.MemberCache.member_hash) {
1116                                 for (int i = 0; i < entry.Value.Count; ++i ) {
1117                                         var name_entry = entry.Value[i];
1118                                         if ((name_entry.Modifiers & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
1119                                                 continue;
1120
1121                                         if ((name_entry.Modifiers & (Modifiers.OVERRIDE | Modifiers.COMPILER_GENERATED)) != 0)
1122                                                 continue;
1123
1124                                         if ((name_entry.Kind & MemberKind.MaskType) == 0)
1125                                                 continue;
1126
1127                                         if (name_entry.MemberDefinition.CLSAttributeValue == false)
1128                                             continue;
1129
1130                                         IParametersMember p_a = name_entry as IParametersMember;
1131                                         if (p_a != null && !name_entry.IsAccessor) {
1132                                                 if (!is_imported_type) {
1133                                                         var p_a_pd = p_a.Parameters;
1134                                                         for (int ii = i + 1; ii < entry.Value.Count; ++ii) {
1135                                                                 var checked_entry = entry.Value[ii];
1136                                                                 IParametersMember p_b = checked_entry as IParametersMember;
1137                                                                 if (p_b == null)
1138                                                                         continue;
1139
1140                                                                 if (p_a_pd.Count != p_b.Parameters.Count)
1141                                                                         continue;
1142
1143                                                                 if (checked_entry.IsAccessor)
1144                                                                         continue;
1145
1146                                                                 var res = ParametersCompiled.IsSameClsSignature (p_a.Parameters, p_b.Parameters);
1147                                                                 if (res != 0) {
1148                                                                         var last = GetLaterDefinedMember (checked_entry, name_entry);
1149                                                                         if (last == checked_entry.MemberDefinition) {
1150                                                                                 report.SymbolRelatedToPreviousError (name_entry);
1151                                                                         } else {
1152                                                                                 report.SymbolRelatedToPreviousError (checked_entry);
1153                                                                         }
1154
1155                                                                         if ((res & 1) != 0) {
1156                                                                                 report.Warning (3006, 1, last.Location,
1157                                                                                                 "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant",
1158                                                                                                 name_entry.GetSignatureForError ());
1159                                                                         }
1160
1161                                                                         if ((res & 2) != 0) {
1162                                                                                 report.Warning (3007, 1, last.Location,
1163                                                                                         "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant",
1164                                                                                         name_entry.GetSignatureForError ());
1165                                                                         }
1166                                                                 }
1167                                                         }
1168                                                 }
1169                                         }
1170
1171                                         if (i > 0 || name_entry.Kind == MemberKind.Constructor || name_entry.Kind == MemberKind.Indexer)
1172                                                 continue;
1173
1174                                         var name_entry_locase = name_entry.Name.ToLowerInvariant ();
1175
1176                                         MemberSpec[] found;
1177                                         if (!locase_members.TryGetValue (name_entry_locase, out found)) {
1178                                                 found = new MemberSpec[] { name_entry };
1179                                                 locase_members.Add (name_entry_locase, found);
1180                                         } else {
1181                                                 bool same_names_only = true;
1182                                                 foreach (var f in found) {
1183                                                         if (f.Name == name_entry.Name)
1184                                                                 continue;
1185
1186 //                                                      if (f.IsAccessor && name_entry.IsAccessor)
1187 //                                                              continue;
1188
1189                                                         same_names_only = false;
1190                                                         if (!is_imported_type) {
1191                                                                 var last = GetLaterDefinedMember (f, name_entry);
1192                                                                 if (last == f.MemberDefinition) {
1193                                                                         report.SymbolRelatedToPreviousError (name_entry);
1194                                                                 } else {
1195                                                                         report.SymbolRelatedToPreviousError (f);
1196                                                                 }
1197
1198                                                                 report.Warning (3005, 1, last.Location,
1199                                                                         "Identifier `{0}' differing only in case is not CLS-compliant", last.GetSignatureForError ());
1200                                                         }
1201                                                 }
1202
1203                                                 if (!same_names_only) {
1204                                                         Array.Resize (ref found, found.Length + 1);
1205                                                         found[found.Length - 1] = name_entry;
1206                                                         locase_members[name_entry_locase] = found;
1207                                                 }
1208                                         }
1209                                 }
1210                         }
1211                 }
1212
1213                 //
1214                 // Local report helper to issue correctly ordered members stored in hashtable
1215                 //
1216                 static MemberCore GetLaterDefinedMember (MemberSpec a, MemberSpec b)
1217                 {
1218                         var mc_a = a.MemberDefinition as MemberCore;
1219                         var mc_b = b.MemberDefinition as MemberCore;
1220                         if (mc_a == null)
1221                                 return mc_b;
1222
1223                         if (mc_b == null)
1224                                 return mc_a;
1225
1226                         if (mc_a.Location.File != mc_a.Location.File)
1227                                 return mc_b;
1228
1229                         return mc_b.Location.Row > mc_a.Location.Row ? mc_b : mc_a;
1230                 }
1231
1232                 public bool CheckExistingMembersOverloads (MemberCore member, AParametersCollection parameters)
1233                 {
1234                         var name = GetLookupName (member);
1235                         var imb = member as InterfaceMemberBase;
1236                         if (imb != null && imb.IsExplicitImpl) {
1237                                 name = imb.GetFullName (name);
1238                         }
1239
1240                         return CheckExistingMembersOverloads (member, name, parameters);
1241                 }
1242
1243                 public bool CheckExistingMembersOverloads (MemberCore member, string name, AParametersCollection parameters)
1244                 {
1245                         IList<MemberSpec> entries;
1246                         if (!member_hash.TryGetValue (name, out entries))
1247                                 return false;
1248
1249                         var Report = member.Compiler.Report;
1250
1251                         int method_param_count = parameters.Count;
1252                         for (int i = entries.Count - 1; i >= 0; --i) {
1253                                 var ce = entries[i];
1254                                 var pm = ce as IParametersMember;
1255                                 var pd = pm == null ? ParametersCompiled.EmptyReadOnlyParameters : pm.Parameters;
1256                                 if (pd.Count != method_param_count)
1257                                         continue;
1258
1259                                 if (ce.Arity != member.MemberName.Arity)
1260                                         continue;
1261
1262                                 // Ignore merged interface members
1263                                 if (member.Parent.PartialContainer != ce.DeclaringType.MemberDefinition)
1264                                         continue;
1265
1266                                 var p_types = pd.Types;
1267                                 if (method_param_count > 0) {
1268                                         int ii = method_param_count - 1;
1269                                         TypeSpec type_a, type_b;
1270                                         do {
1271                                                 type_a = parameters.Types [ii];
1272                                                 type_b = p_types [ii];
1273
1274                                                 if ((pd.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF) !=
1275                                                         (parameters.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF))
1276                                                         break;
1277
1278                                         } while (TypeSpecComparer.Override.IsEqual (type_a, type_b) && ii-- != 0);
1279
1280                                         if (ii >= 0)
1281                                                 continue;
1282
1283                                         //
1284                                         // Operators can differ in return type only
1285                                         //
1286                                         if (member is Operator && ce.Kind == MemberKind.Operator && ((MethodSpec) ce).ReturnType != ((Operator) member).ReturnType)
1287                                                 continue;
1288
1289                                         //
1290                                         // Report difference in parameter modifiers only
1291                                         //
1292                                         if (pd != null && member is MethodCore) {
1293                                                 ii = method_param_count;
1294                                                 while (ii-- != 0 && parameters.FixedParameters[ii].ModFlags == pd.FixedParameters[ii].ModFlags &&
1295                                                         parameters.ExtensionMethodType == pd.ExtensionMethodType) ;
1296
1297                                                 if (ii >= 0) {
1298                                                         var mc = ce as MethodSpec;
1299                                                         member.Compiler.Report.SymbolRelatedToPreviousError (ce);
1300                                                         if ((member.ModFlags & Modifiers.PARTIAL) != 0 && (mc.Modifiers & Modifiers.PARTIAL) != 0) {
1301                                                                 if (parameters.HasParams || pd.HasParams) {
1302                                                                         Report.Error (758, member.Location,
1303                                                                                 "A partial method declaration and partial method implementation cannot differ on use of `params' modifier");
1304                                                                 } else {
1305                                                                         Report.Error (755, member.Location,
1306                                                                                 "A partial method declaration and partial method implementation must be both an extension method or neither");
1307                                                                 }
1308                                                         } else if (member is Constructor) {
1309                                                                 Report.Error (851, member.Location,
1310                                                                         "Overloaded contructor `{0}' cannot differ on use of parameter modifiers only",
1311                                                                         member.GetSignatureForError ());
1312                                                         } else {
1313                                                                 Report.Error (663, member.Location,
1314                                                                         "Overloaded method `{0}' cannot differ on use of parameter modifiers only",
1315                                                                         member.GetSignatureForError ());
1316                                                         }
1317                                                         return false;
1318                                                 }
1319                                         }
1320                                 }
1321
1322                                 if ((ce.Kind & MemberKind.Method) != 0) {
1323                                         Method method_a = member as Method;
1324                                         Method method_b = ce.MemberDefinition as Method;
1325                                         if (method_a != null && method_b != null && (method_a.ModFlags & method_b.ModFlags & Modifiers.PARTIAL) != 0) {
1326                                                 const Modifiers partial_modifiers = Modifiers.STATIC | Modifiers.UNSAFE;
1327                                                 if (method_a.IsPartialDefinition == method_b.IsPartialImplementation) {
1328                                                         if ((method_a.ModFlags & partial_modifiers) == (method_b.ModFlags & partial_modifiers) ||
1329                                                                 method_a.Parent.IsUnsafe && method_b.Parent.IsUnsafe) {
1330                                                                 if (method_a.IsPartialImplementation) {
1331                                                                         method_a.SetPartialDefinition (method_b);
1332                                                                         if (entries.Count == 1)
1333                                                                                 member_hash.Remove (name);
1334                                                                         else
1335                                                                                 entries.RemoveAt (i);
1336                                                                 } else {
1337                                                                         method_b.SetPartialDefinition (method_a);
1338                                                                         method_a.caching_flags |= MemberCore.Flags.PartialDefinitionExists;
1339                                                                 }
1340                                                                 continue;
1341                                                         }
1342
1343                                                         if (method_a.IsStatic != method_b.IsStatic) {
1344                                                                 Report.SymbolRelatedToPreviousError (ce);
1345                                                                 Report.Error (763, member.Location,
1346                                                                         "A partial method declaration and partial method implementation must be both `static' or neither");
1347                                                         }
1348
1349                                                         Report.SymbolRelatedToPreviousError (ce);
1350                                                         Report.Error (764, member.Location,
1351                                                                 "A partial method declaration and partial method implementation must be both `unsafe' or neither");
1352                                                         return false;
1353                                                 }
1354
1355                                                 Report.SymbolRelatedToPreviousError (ce);
1356                                                 if (method_a.IsPartialDefinition) {
1357                                                         Report.Error (756, member.Location, "A partial method `{0}' declaration is already defined",
1358                                                                 member.GetSignatureForError ());
1359                                                 }
1360
1361                                                 Report.Error (757, member.Location, "A partial method `{0}' implementation is already defined",
1362                                                         member.GetSignatureForError ());
1363                                                 return false;
1364                                         }
1365
1366                                         Report.SymbolRelatedToPreviousError (ce);
1367
1368                                         bool is_reserved_a = member is AbstractPropertyEventMethod || member is Operator;
1369                                         bool is_reserved_b = ((MethodSpec) ce).IsReservedMethod;
1370
1371                                         if (is_reserved_a || is_reserved_b) {
1372                                                 Report.Error (82, member.Location, "A member `{0}' is already reserved",
1373                                                         is_reserved_a ?
1374                                                         ce.GetSignatureForError () :
1375                                                         member.GetSignatureForError ());
1376                                                 return false;
1377                                         }
1378                                 } else {
1379                                         Report.SymbolRelatedToPreviousError (ce);
1380                                 }
1381
1382                                 if (member is Operator && ce.Kind == MemberKind.Operator) {
1383                                         Report.Error (557, member.Location, "Duplicate user-defined conversion in type `{0}'",
1384                                                 member.Parent.GetSignatureForError ());
1385                                         return false;
1386                                 }
1387
1388                                 Report.Error (111, member.Location,
1389                                         "A member `{0}' is already defined. Rename this member or use different parameter types",
1390                                         member.GetSignatureForError ());
1391                                 return false;
1392                         }
1393
1394                         return true;
1395                 }
1396         }
1397 }