mcs/mcs/class.cs

   1 //
   2 // class.cs: Class and Struct handlers
   3 //
   4 // Authors: Miguel de Icaza (miguel@gnu.org)
   5 //          Martin Baulig (martin@ximian.com)
   6 //          Marek Safar (marek.safar@gmail.com)
   7 //
   8 // Dual licensed under the terms of the MIT X11 or GNU GPL
   9 //
  10 // Copyright 2001, 2002, 2003 Ximian, Inc (http://www.ximian.com)
  11 // Copyright 2004-2011 Novell, Inc
  12 // Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
  13 //
  14
  15 using System;
  16 using System.Collections.Generic;
  17 using System.Runtime.InteropServices;
  18 using System.Security;
  19 using System.Security.Permissions;
  20 using System.Linq;
  21 using System.Text;
  22 using System.Diagnostics;
  23 using Mono.CompilerServices.SymbolWriter;
  24
  25 #if NET_2_1
  26 using XmlElement = System.Object;
  27 #endif
  28
  29 #if STATIC
  30 using SecurityType = System.Collections.Generic.List<IKVM.Reflection.Emit.CustomAttributeBuilder>;
  31 using IKVM.Reflection;
  32 using IKVM.Reflection.Emit;
  33 #else
  34 using SecurityType = System.Collections.Generic.Dictionary<System.Security.Permissions.SecurityAction, System.Security.PermissionSet>;
  35 using System.Reflection;
  36 using System.Reflection.Emit;
  37 #endif
  38
  39 namespace Mono.CSharp
  40 {
  41         //
  42         // General types container, used as a base class for all constructs which can hold types
  43         //
  44         public abstract class TypeContainer : MemberCore
  45         {
  46                 public readonly MemberKind Kind;
  47                 public readonly string Basename;
  48
  49                 protected List<TypeContainer> containers;
  50
  51                 TypeDefinition main_container;
  52
  53                 protected Dictionary<string, MemberCore> defined_names;
  54
  55                 protected bool is_defined;
  56
  57                 public TypeContainer (TypeContainer parent, MemberName name, Attributes attrs, MemberKind kind)
  58                         : base (parent, name, attrs)
  59                 {
  60                         this.Kind = kind;
  61                         if (name != null)
  62                                 this.Basename = name.Basename;
  63
  64                         defined_names = new Dictionary<string, MemberCore> ();
  65                 }
  66
  67                 public override TypeSpec CurrentType {
  68                         get {
  69                                 return null;
  70                         }
  71                 }
  72
  73                 public Dictionary<string, MemberCore> DefinedNames {
  74                         get {
  75                                 return defined_names;
  76                         }
  77                 }
  78
  79                 public TypeDefinition PartialContainer {
  80                         get {
  81                                 return main_container;
  82                         }
  83                         protected set {
  84                                 main_container = value;
  85                         }
  86                 }
  87
  88                 public IList<TypeContainer> Containers {
  89                         get {
  90                                 return containers;
  91                         }
  92                 }
  93
  94                 //
  95                 // Any unattached attributes during parsing get added here. User
  96                 // by FULL_AST mode
  97                 //
  98                 public Attributes UnattachedAttributes {
  99                         get; set;
 100                 }
 101
 102                 public virtual void AddCompilerGeneratedClass (CompilerGeneratedContainer c)
 103                 {
 104                         containers.Add (c);
 105                 }
 106
 107                 public virtual void AddPartial (TypeDefinition next_part)
 108                 {
 109                         MemberCore mc;
 110                         (PartialContainer ?? this).defined_names.TryGetValue (next_part.Basename, out mc);
 111
 112                         AddPartial (next_part, mc as TypeDefinition);
 113                 }
 114
 115                 protected void AddPartial (TypeDefinition next_part, TypeDefinition existing)
 116                 {
 117                         next_part.ModFlags |= Modifiers.PARTIAL;
 118
 119                         if (existing == null) {
 120                                 AddTypeContainer (next_part);
 121                                 return;
 122                         }
 123
 124                         if ((existing.ModFlags & Modifiers.PARTIAL) == 0) {
 125                                 if (existing.Kind != next_part.Kind) {
 126                                         AddTypeContainer (next_part);
 127                                 } else {
 128                                         Report.SymbolRelatedToPreviousError (next_part);
 129                                         Error_MissingPartialModifier (existing);
 130                                 }
 131
 132                                 return;
 133                         }
 134
 135                         if (existing.Kind != next_part.Kind) {
 136                                 Report.SymbolRelatedToPreviousError (existing);
 137                                 Report.Error (261, next_part.Location,
 138                                         "Partial declarations of `{0}' must be all classes, all structs or all interfaces",
 139                                         next_part.GetSignatureForError ());
 140                         }
 141
 142                         if ((existing.ModFlags & Modifiers.AccessibilityMask) != (next_part.ModFlags & Modifiers.AccessibilityMask) &&
 143                                 ((existing.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) == 0 &&
 144                                  (next_part.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) == 0)) {
 145                                          Report.SymbolRelatedToPreviousError (existing);
 146                                 Report.Error (262, next_part.Location,
 147                                         "Partial declarations of `{0}' have conflicting accessibility modifiers",
 148                                         next_part.GetSignatureForError ());
 149                         }
 150
 151                         var tc_names = existing.CurrentTypeParameters;
 152                         if (tc_names != null) {
 153                                 for (int i = 0; i < tc_names.Count; ++i) {
 154                                         var tp = next_part.MemberName.TypeParameters[i];
 155                                         if (tc_names[i].MemberName.Name != tp.MemberName.Name) {
 156                                                 Report.SymbolRelatedToPreviousError (existing.Location, "");
 157                                                 Report.Error (264, next_part.Location, "Partial declarations of `{0}' must have the same type parameter names in the same order",
 158                                                         next_part.GetSignatureForError ());
 159                                                 break;
 160                                         }
 161
 162                                         if (tc_names[i].Variance != tp.Variance) {
 163                                                 Report.SymbolRelatedToPreviousError (existing.Location, "");
 164                                                 Report.Error (1067, next_part.Location, "Partial declarations of `{0}' must have the same type parameter variance modifiers",
 165                                                         next_part.GetSignatureForError ());
 166                                                 break;
 167                                         }
 168                                 }
 169                         }
 170
 171                         if ((next_part.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) != 0) {
 172                                 existing.ModFlags |= next_part.ModFlags & ~(Modifiers.DEFAULT_ACCESS_MODIFER | Modifiers.AccessibilityMask);
 173                         } else if ((existing.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFER) != 0) {
 174                                 existing.ModFlags &= ~(Modifiers.DEFAULT_ACCESS_MODIFER | Modifiers.AccessibilityMask);
 175                                 existing.ModFlags |= next_part.ModFlags;
 176                         } else {
 177                                 existing.ModFlags |= next_part.ModFlags;
 178                         }
 179
 180                         existing.Definition.Modifiers = existing.ModFlags;
 181
 182                         if (next_part.attributes != null) {
 183                                 if (existing.attributes == null)
 184                                         existing.attributes = next_part.attributes;
 185                                 else
 186                                         existing.attributes.AddAttributes (next_part.attributes.Attrs);
 187                         }
 188
 189                         next_part.PartialContainer = existing;
 190
 191                         if (containers == null)
 192                                 containers = new List<TypeContainer> ();
 193
 194                         containers.Add (next_part);
 195                 }
 196
 197                 public virtual void AddTypeContainer (TypeContainer tc)
 198                 {
 199                         containers.Add (tc);
 200
 201                         var tparams = tc.MemberName.TypeParameters;
 202                         if (tparams != null && tc.PartialContainer != null) {
 203                                 var td = (TypeDefinition) tc;
 204                                 for (int i = 0; i < tparams.Count; ++i) {
 205                                         var tp = tparams[i];
 206                                         if (tp.MemberName == null)
 207                                                 continue;
 208
 209                                         td.AddNameToContainer (tp, tp.Name);
 210                                 }
 211                         }
 212                 }
 213
 214                 public virtual void CloseContainer ()
 215                 {
 216                         if (containers != null) {
 217                                 foreach (TypeContainer tc in containers) {
 218                                         tc.CloseContainer ();
 219                                 }
 220                         }
 221                 }
 222
 223                 public virtual void CreateMetadataName (StringBuilder sb)
 224                 {
 225                         if (Parent != null && Parent.MemberName != null)
 226                                 Parent.CreateMetadataName (sb);
 227
 228                         MemberName.CreateMetadataName (sb);
 229                 }
 230
 231                 public virtual bool CreateContainer ()
 232                 {
 233                         if (containers != null) {
 234                                 foreach (TypeContainer tc in containers) {
 235                                         tc.CreateContainer ();
 236                                 }
 237                         }
 238
 239                         return true;
 240                 }
 241
 242                 public override bool Define ()
 243                 {
 244                         if (containers != null) {
 245                                 foreach (TypeContainer tc in containers) {
 246                                         tc.Define ();
 247                                 }
 248                         }
 249
 250                         // Release cache used by parser only
 251                         if (Module.Evaluator == null) {
 252                                 defined_names = null;
 253                         } else {
 254                                 defined_names.Clear ();
 255                         }
 256
 257                         return true;
 258                 }
 259
 260                 public virtual void PrepareEmit ()
 261                 {
 262                         if (containers != null) {
 263                                 foreach (var t in containers) {
 264                                         try {
 265                                                 t.PrepareEmit ();
 266                                         } catch (Exception e) {
 267                                                 if (MemberName == MemberName.Null)
 268                                                         throw;
 269
 270                                                 throw new InternalErrorException (t, e);
 271                                         }
 272                                 }
 273                         }
 274                 }
 275
 276                 public virtual bool DefineContainer ()
 277                 {
 278                         if (is_defined)
 279                                 return true;
 280
 281                         is_defined = true;
 282
 283                         DoDefineContainer ();
 284
 285                         if (containers != null) {
 286                                 foreach (TypeContainer tc in containers) {
 287                                         try {
 288                                                 tc.DefineContainer ();
 289                                         } catch (Exception e) {
 290                                                 if (MemberName == MemberName.Null)
 291                                                         throw;
 292
 293                                                 throw new InternalErrorException (tc, e);
 294                                         }
 295                                 }
 296                         }
 297
 298                         return true;
 299                 }
 300
 301                 protected virtual void DefineNamespace ()
 302                 {
 303                         if (containers != null) {
 304                                 foreach (var tc in containers) {
 305                                         try {
 306                                                 tc.DefineNamespace ();
 307                                         } catch (Exception e) {
 308                                                 throw new InternalErrorException (tc, e);
 309                                         }
 310                                 }
 311                         }
 312                 }
 313
 314                 protected virtual void DoDefineContainer ()
 315                 {
 316                 }
 317
 318                 public virtual void EmitContainer ()
 319                 {
 320                         if (containers != null) {
 321                                 for (int i = 0; i < containers.Count; ++i)
 322                                         containers[i].EmitContainer ();
 323                         }
 324                 }
 325
 326                 protected void Error_MissingPartialModifier (MemberCore type)
 327                 {
 328                         Report.Error (260, type.Location,
 329                                 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
 330                                 type.GetSignatureForError ());
 331                 }
 332
 333                 public override string GetSignatureForDocumentation ()
 334                 {
 335                         if (Parent != null && Parent.MemberName != null)
 336                                 return Parent.GetSignatureForDocumentation () + "." + MemberName.GetSignatureForDocumentation ();
 337
 338                         return MemberName.GetSignatureForDocumentation ();
 339                 }
 340
 341                 public override string GetSignatureForError ()
 342                 {
 343                         if (Parent != null && Parent.MemberName != null)
 344                                 return Parent.GetSignatureForError () + "." + MemberName.GetSignatureForError ();
 345
 346                         return MemberName.GetSignatureForError ();
 347                 }
 348
 349                 public string GetSignatureForMetadata ()
 350                 {
 351 #if STATIC
 352                         if (Parent is TypeDefinition) {
 353                                 return Parent.GetSignatureForMetadata () + "+" + TypeNameParser.Escape (MemberName.Basename);
 354                         }
 355
 356                         var sb = new StringBuilder ();
 357                         CreateMetadataName (sb);
 358                         return sb.ToString ();
 359 #else
 360                         throw new NotImplementedException ();
 361 #endif
 362                 }
 363
 364                 public virtual void RemoveContainer (TypeContainer cont)
 365                 {
 366                         if (containers != null)
 367                                 containers.Remove (cont);
 368
 369                         var tc = Parent == Module ? Module : this;
 370                         tc.defined_names.Remove (cont.Basename);
 371                 }
 372
 373                 public virtual void VerifyMembers ()
 374                 {
 375                         if (containers != null) {
 376                                 foreach (TypeContainer tc in containers)
 377                                         tc.VerifyMembers ();
 378                         }
 379                 }
 380
 381                 public override void WriteDebugSymbol (MonoSymbolFile file)
 382                 {
 383                         if (containers != null) {
 384                                 foreach (TypeContainer tc in containers) {
 385                                         tc.WriteDebugSymbol (file);
 386                                 }
 387                         }
 388                 }
 389         }
 390
 391         public abstract class TypeDefinition : TypeContainer, ITypeDefinition
 392         {
 393                 //
 394                 // Different context is needed when resolving type container base
 395                 // types. Type names come from the parent scope but type parameter
 396                 // names from the container scope.
 397                 //
 398                 public struct BaseContext : IMemberContext
 399                 {
 400                         TypeContainer tc;
 401
 402                         public BaseContext (TypeContainer tc)
 403                         {
 404                                 this.tc = tc;
 405                         }
 406
 407                         #region IMemberContext Members
 408
 409                         public CompilerContext Compiler {
 410                                 get { return tc.Compiler; }
 411                         }
 412
 413                         public TypeSpec CurrentType {
 414                                 get { return tc.Parent.CurrentType; }
 415                         }
 416
 417                         public TypeParameters CurrentTypeParameters {
 418                                 get { return tc.PartialContainer.CurrentTypeParameters; }
 419                         }
 420
 421                         public MemberCore CurrentMemberDefinition {
 422                                 get { return tc; }
 423                         }
 424
 425                         public bool IsObsolete {
 426                                 get { return tc.IsObsolete; }
 427                         }
 428
 429                         public bool IsUnsafe {
 430                                 get { return tc.IsUnsafe; }
 431                         }
 432
 433                         public bool IsStatic {
 434                                 get { return tc.IsStatic; }
 435                         }
 436
 437                         public ModuleContainer Module {
 438                                 get { return tc.Module; }
 439                         }
 440
 441                         public string GetSignatureForError ()
 442                         {
 443                                 return tc.GetSignatureForError ();
 444                         }
 445
 446                         public ExtensionMethodCandidates LookupExtensionMethod (TypeSpec extensionType, string name, int arity)
 447                         {
 448                                 return null;
 449                         }
 450
 451                         public FullNamedExpression LookupNamespaceAlias (string name)
 452                         {
 453                                 return tc.Parent.LookupNamespaceAlias (name);
 454                         }
 455
 456                         public FullNamedExpression LookupNamespaceOrType (string name, int arity, LookupMode mode, Location loc)
 457                         {
 458                                 if (arity == 0) {
 459                                         var tp = CurrentTypeParameters;
 460                                         if (tp != null) {
 461                                                 TypeParameter t = tp.Find (name);
 462                                                 if (t != null)
 463                                                         return new TypeParameterExpr (t, loc);
 464                                         }
 465                                 }
 466
 467                                 return tc.Parent.LookupNamespaceOrType (name, arity, mode, loc);
 468                         }
 469
 470                         #endregion
 471                 }
 472
 473                 [Flags]
 474                 enum CachedMethods
 475                 {
 476                         Equals                          = 1,
 477                         GetHashCode                     = 1 << 1,
 478                         HasStaticFieldInitializer       = 1 << 2
 479                 }
 480
 481                 readonly List<MemberCore> members;
 482
 483                 // Holds a list of fields that have initializers
 484                 protected List<FieldInitializer> initialized_fields;
 485
 486                 // Holds a list of static fields that have initializers
 487                 protected List<FieldInitializer> initialized_static_fields;
 488
 489                 Dictionary<MethodSpec, Method> hoisted_base_call_proxies;
 490
 491                 Dictionary<string, FullNamedExpression> Cache = new Dictionary<string, FullNamedExpression> ();
 492
 493                 //
 494                 // Points to the first non-static field added to the container.
 495                 //
 496                 // This is an arbitrary choice.  We are interested in looking at _some_ non-static field,
 497                 // and the first one's as good as any.
 498                 //
 499                 protected FieldBase first_nonstatic_field;
 500
 501                 //
 502                 // This one is computed after we can distinguish interfaces
 503                 // from classes from the arraylist `type_bases'
 504                 //
 505                 protected TypeSpec base_type;
 506                 FullNamedExpression base_type_expr;     // TODO: It's temporary variable
 507                 protected TypeSpec[] iface_exprs;
 508
 509                 protected List<FullNamedExpression> type_bases;
 510
 511                 TypeDefinition InTransit;
 512
 513                 public TypeBuilder TypeBuilder;
 514                 GenericTypeParameterBuilder[] all_tp_builders;
 515                 //
 516                 // All recursive type parameters put together sharing same
 517                 // TypeParameter instances
 518                 //
 519                 TypeParameters all_type_parameters;
 520
 521                 public const string DefaultIndexerName = "Item";
 522
 523                 bool has_normal_indexers;
 524                 string indexer_name;
 525                 protected bool requires_delayed_unmanagedtype_check;
 526                 bool error;
 527                 bool members_defined;
 528                 bool members_defined_ok;
 529                 protected bool has_static_constructor;
 530
 531                 private CachedMethods cached_method;
 532
 533                 protected TypeSpec spec;
 534                 TypeSpec current_type;
 535
 536                 public int DynamicSitesCounter;
 537                 public int AnonymousMethodsCounter;
 538
 539                 static readonly string[] attribute_targets = new string[] { "type" };
 540
 541                 /// <remarks>
 542                 ///  The pending methods that need to be implemented
 543                 //   (interfaces or abstract methods)
 544                 /// </remarks>
 545                 PendingImplementation pending;
 546
 547                 public TypeDefinition (TypeContainer parent, MemberName name, Attributes attrs, MemberKind kind)
 548                         : base (parent, name, attrs, kind)
 549                 {
 550                         PartialContainer = this;
 551                         members = new List<MemberCore> ();
 552                 }
 553
 554                 #region Properties
 555
 556                 public List<FullNamedExpression> BaseTypeExpressions {
 557                         get {
 558                                 return type_bases;
 559                         }
 560                 }
 561
 562                 public override TypeSpec CurrentType {
 563                         get {
 564                                 if (current_type == null) {
 565                                         if (IsGenericOrParentIsGeneric) {
 566                                                 //
 567                                                 // Switch to inflated version as it's used by all expressions
 568                                                 //
 569                                                 var targs = CurrentTypeParameters == null ? TypeSpec.EmptyTypes : CurrentTypeParameters.Types;
 570                                                 current_type = spec.MakeGenericType (this, targs);
 571                                         } else {
 572                                                 current_type = spec;
 573                                         }
 574                                 }
 575
 576                                 return current_type;
 577                         }
 578                 }
 579
 580                 public override TypeParameters CurrentTypeParameters {
 581                         get {
 582                                 return PartialContainer.MemberName.TypeParameters;
 583                         }
 584                 }
 585
 586                 int CurrentTypeParametersStartIndex {
 587                         get {
 588                                 int total = all_tp_builders.Length;
 589                                 if (CurrentTypeParameters != null) {
 590                                         return total - CurrentTypeParameters.Count;
 591                                 }
 592                                 return total;
 593                         }
 594                 }
 595
 596                 public virtual AssemblyDefinition DeclaringAssembly {
 597                         get {
 598                                 return Module.DeclaringAssembly;
 599                         }
 600                 }
 601
 602                 IAssemblyDefinition ITypeDefinition.DeclaringAssembly {
 603                         get {
 604                                 return Module.DeclaringAssembly;
 605                         }
 606                 }
 607
 608                 public TypeSpec Definition {
 609                         get {
 610                                 return spec;
 611                         }
 612                 }
 613
 614                 public bool HasMembersDefined {
 615                         get {
 616                                 return members_defined;
 617                         }
 618                 }
 619
 620                 public bool HasInstanceConstructor {
 621                         get {
 622                                 return (caching_flags & Flags.HasInstanceConstructor) != 0;
 623                         }
 624                         set {
 625                                 caching_flags |= Flags.HasInstanceConstructor;
 626                         }
 627                 }
 628
 629                 // Indicated whether container has StructLayout attribute set Explicit
 630                 public bool HasExplicitLayout {
 631                         get { return (caching_flags & Flags.HasExplicitLayout) != 0; }
 632                         set { caching_flags |= Flags.HasExplicitLayout; }
 633                 }
 634
 635                 public bool HasOperators {
 636                         get {
 637                                 return (caching_flags & Flags.HasUserOperators) != 0;
 638                         }
 639                         set {
 640                                 caching_flags |= Flags.HasUserOperators;
 641                         }
 642                 }
 643
 644                 public bool HasStructLayout {
 645                         get { return (caching_flags & Flags.HasStructLayout) != 0; }
 646                         set { caching_flags |= Flags.HasStructLayout; }
 647                 }
 648
 649                 public TypeSpec[] Interfaces {
 650                         get {
 651                                 return iface_exprs;
 652                         }
 653                 }
 654
 655                 public bool IsGenericOrParentIsGeneric {
 656                         get {
 657                                 return all_type_parameters != null;
 658                         }
 659                 }
 660
 661                 public bool IsTopLevel {
 662                         get {
 663                                 return !(Parent is TypeDefinition);
 664                         }
 665                 }
 666
 667                 public bool IsPartial {
 668                         get {
 669                                 return (ModFlags & Modifiers.PARTIAL) != 0;
 670                         }
 671                 }
 672
 673                 //
 674                 // Returns true for secondary partial containers
 675                 //
 676                 bool IsPartialPart {
 677                         get {
 678                                 return PartialContainer != this;
 679                         }
 680                 }
 681
 682                 public MemberCache MemberCache {
 683                         get {
 684                                 return spec.MemberCache;
 685                         }
 686                 }
 687
 688                 public List<MemberCore> Members {
 689                         get {
 690                                 return members;
 691                         }
 692                 }
 693
 694                 string ITypeDefinition.Namespace {
 695                         get {
 696                                 var p = Parent;
 697                                 while (p.Kind != MemberKind.Namespace)
 698                                         p = p.Parent;
 699
 700                                 return p.MemberName == null ? null : p.GetSignatureForError ();
 701                         }
 702                 }
 703
 704                 public TypeParameters TypeParametersAll {
 705                         get {
 706                                 return all_type_parameters;
 707                         }
 708                 }
 709
 710                 public override string[] ValidAttributeTargets {
 711                         get {
 712                                 return attribute_targets;
 713                         }
 714                 }
 715
 716                 #endregion
 717
 718                 public override void Accept (StructuralVisitor visitor)
 719                 {
 720                         visitor.Visit (this);
 721                 }
 722
 723                 public void AddMember (MemberCore symbol)
 724                 {
 725                         if (symbol.MemberName.ExplicitInterface != null) {
 726                                 if (!(Kind == MemberKind.Class || Kind == MemberKind.Struct)) {
 727                                         Report.Error (541, symbol.Location,
 728                                                 "`{0}': explicit interface declaration can only be declared in a class or struct",
 729                                                 symbol.GetSignatureForError ());
 730                                 }
 731                         }
 732
 733                         AddNameToContainer (symbol, symbol.MemberName.Basename);
 734                         members.Add (symbol);
 735                 }
 736
 737                 public override void AddTypeContainer (TypeContainer tc)
 738                 {
 739                         AddNameToContainer (tc, tc.Basename);
 740
 741                         if (containers == null)
 742                                 containers = new List<TypeContainer> ();
 743
 744                         members.Add (tc);
 745                         base.AddTypeContainer (tc);
 746                 }
 747
 748                 public override void AddCompilerGeneratedClass (CompilerGeneratedContainer c)
 749                 {
 750                         members.Add (c);
 751
 752                         if (containers == null)
 753                                 containers = new List<TypeContainer> ();
 754
 755                         base.AddCompilerGeneratedClass (c);
 756                 }
 757
 758                 //
 759                 // Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 760                 //
 761                 public virtual void AddNameToContainer (MemberCore symbol, string name)
 762                 {
 763                         if (((ModFlags | symbol.ModFlags) & Modifiers.COMPILER_GENERATED) != 0)
 764                                 return;
 765
 766                         MemberCore mc;
 767                         if (!PartialContainer.defined_names.TryGetValue (name, out mc)) {
 768                                 PartialContainer.defined_names.Add (name, symbol);
 769                                 return;
 770                         }
 771
 772                         if (symbol.EnableOverloadChecks (mc))
 773                                 return;
 774
 775                         InterfaceMemberBase im = mc as InterfaceMemberBase;
 776                         if (im != null && im.IsExplicitImpl)
 777                                 return;
 778
 779                         Report.SymbolRelatedToPreviousError (mc);
 780                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
 781                                 Error_MissingPartialModifier (symbol);
 782                                 return;
 783                         }
 784
 785                         if (symbol is TypeParameter) {
 786                                 Report.Error (692, symbol.Location,
 787                                         "Duplicate type parameter `{0}'", symbol.GetSignatureForError ());
 788                         } else {
 789                                 Report.Error (102, symbol.Location,
 790                                         "The type `{0}' already contains a definition for `{1}'",
 791                                         GetSignatureForError (), name);
 792                         }
 793
 794                         return;
 795                 }
 796
 797                 public void AddConstructor (Constructor c)
 798                 {
 799                         AddConstructor (c, false);
 800                 }
 801
 802                 public void AddConstructor (Constructor c, bool isDefault)
 803                 {
 804                         bool is_static = (c.ModFlags & Modifiers.STATIC) != 0;
 805                         if (!isDefault)
 806                                 AddNameToContainer (c, is_static ? Constructor.TypeConstructorName : Constructor.ConstructorName);
 807
 808                         if (is_static && c.ParameterInfo.IsEmpty) {
 809                                 PartialContainer.has_static_constructor = true;
 810                         } else {
 811                                 PartialContainer.HasInstanceConstructor = true;
 812                         }
 813
 814                         members.Add (c);
 815                 }
 816
 817                 public bool AddField (FieldBase field)
 818                 {
 819                         AddMember (field);
 820
 821                         if ((field.ModFlags & Modifiers.STATIC) != 0)
 822                                 return true;
 823
 824                         var first_field = PartialContainer.first_nonstatic_field;
 825                         if (first_field == null) {
 826                                 PartialContainer.first_nonstatic_field = field;
 827                                 return true;
 828                         }
 829
 830                         if (Kind == MemberKind.Struct && first_field.Parent != field.Parent) {
 831                                 Report.SymbolRelatedToPreviousError (first_field.Parent);
 832                                 Report.Warning (282, 3, field.Location,
 833                                         "struct instance field `{0}' found in different declaration from instance field `{1}'",
 834                                         field.GetSignatureForError (), first_field.GetSignatureForError ());
 835                         }
 836                         return true;
 837                 }
 838
 839                 /// <summary>
 840                 /// Indexer has special handling in constrast to other AddXXX because the name can be driven by IndexerNameAttribute
 841                 /// </summary>
 842                 public void AddIndexer (Indexer i)
 843                 {
 844                         members.Add (i);
 845                 }
 846
 847                 public void AddOperator (Operator op)
 848                 {
 849                         PartialContainer.HasOperators = true;
 850                         AddMember (op);
 851                 }
 852
 853                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 854                 {
 855                         if (has_normal_indexers && a.Type == pa.DefaultMember) {
 856                                 Report.Error (646, a.Location, "Cannot specify the `DefaultMember' attribute on type containing an indexer");
 857                                 return;
 858                         }
 859
 860                         if (a.Type == pa.Required) {
 861                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
 862                                 return;
 863                         }
 864
 865                         TypeBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
 866                 }
 867
 868                 public override AttributeTargets AttributeTargets {
 869                         get {
 870                                 throw new NotSupportedException ();
 871                         }
 872                 }
 873
 874                 public TypeSpec BaseType {
 875                         get {
 876                                 return spec.BaseType;
 877                         }
 878                 }
 879
 880                 protected virtual TypeAttributes TypeAttr {
 881                         get {
 882                                 return ModifiersExtensions.TypeAttr (ModFlags, IsTopLevel);
 883                         }
 884                 }
 885
 886                 public int TypeParametersCount {
 887                         get {
 888                                 return MemberName.Arity;
 889                         }
 890                 }
 891
 892                 TypeParameterSpec[] ITypeDefinition.TypeParameters {
 893                         get {
 894                                 return PartialContainer.CurrentTypeParameters.Types;
 895                         }
 896                 }
 897
 898                 public string GetAttributeDefaultMember ()
 899                 {
 900                         return indexer_name ?? DefaultIndexerName;
 901                 }
 902
 903                 public bool IsComImport {
 904                         get {
 905                                 if (OptAttributes == null)
 906                                         return false;
 907
 908                                 return OptAttributes.Contains (Module.PredefinedAttributes.ComImport);
 909                         }
 910                 }
 911
 912                 public virtual void RegisterFieldForInitialization (MemberCore field, FieldInitializer expression)
 913                 {
 914                         if (IsPartialPart)
 915                                 PartialContainer.RegisterFieldForInitialization (field, expression);
 916
 917                         if ((field.ModFlags & Modifiers.STATIC) != 0){
 918                                 if (initialized_static_fields == null) {
 919                                         HasStaticFieldInitializer = true;
 920                                         initialized_static_fields = new List<FieldInitializer> (4);
 921                                 }
 922
 923                                 initialized_static_fields.Add (expression);
 924                         } else {
 925                                 if (initialized_fields == null)
 926                                         initialized_fields = new List<FieldInitializer> (4);
 927
 928                                 initialized_fields.Add (expression);
 929                         }
 930                 }
 931
 932                 public void ResolveFieldInitializers (BlockContext ec)
 933                 {
 934                         Debug.Assert (!IsPartialPart);
 935
 936                         if (ec.IsStatic) {
 937                                 if (initialized_static_fields == null)
 938                                         return;
 939
 940                                 bool has_complex_initializer = !ec.Module.Compiler.Settings.Optimize;
 941                                 int i;
 942                                 ExpressionStatement [] init = new ExpressionStatement [initialized_static_fields.Count];
 943                                 for (i = 0; i < initialized_static_fields.Count; ++i) {
 944                                         FieldInitializer fi = initialized_static_fields [i];
 945                                         ExpressionStatement s = fi.ResolveStatement (ec);
 946                                         if (s == null) {
 947                                                 s = EmptyExpressionStatement.Instance;
 948                                         } else if (!fi.IsSideEffectFree) {
 949                                                 has_complex_initializer |= true;
 950                                         }
 951
 952                                         init [i] = s;
 953                                 }
 954
 955                                 for (i = 0; i < initialized_static_fields.Count; ++i) {
 956                                         FieldInitializer fi = initialized_static_fields [i];
 957                                         //
 958                                         // Need special check to not optimize code like this
 959                                         // static int a = b = 5;
 960                                         // static int b = 0;
 961                                         //
 962                                         if (!has_complex_initializer && fi.IsDefaultInitializer)
 963                                                 continue;
 964
 965                                         ec.CurrentBlock.AddScopeStatement (new StatementExpression (init [i]));
 966                                 }
 967
 968                                 return;
 969                         }
 970
 971                         if (initialized_fields == null)
 972                                 return;
 973
 974                         for (int i = 0; i < initialized_fields.Count; ++i) {
 975                                 FieldInitializer fi = initialized_fields [i];
 976                                 ExpressionStatement s = fi.ResolveStatement (ec);
 977                                 if (s == null)
 978                                         continue;
 979
 980                                 //
 981                                 // Field is re-initialized to its default value => removed
 982                                 //
 983                                 if (fi.IsDefaultInitializer && ec.Module.Compiler.Settings.Optimize)
 984                                         continue;
 985
 986                                 ec.CurrentBlock.AddScopeStatement (new StatementExpression (s));
 987                         }
 988                 }
 989
 990                 public override string DocComment {
 991                         get {
 992                                 return comment;
 993                         }
 994                         set {
 995                                 if (value == null)
 996                                         return;
 997
 998                                 comment += value;
 999                         }
1000                 }
1001
1002                 public PendingImplementation PendingImplementations {
1003                         get { return pending; }
1004                 }
1005
1006                 internal override void GenerateDocComment (DocumentationBuilder builder)
1007                 {
1008                         if (IsPartialPart)
1009                                 return;
1010
1011                         base.GenerateDocComment (builder);
1012
1013                         foreach (var member in members)
1014                                 member.GenerateDocComment (builder);
1015                 }
1016
1017                 public TypeSpec GetAttributeCoClass ()
1018                 {
1019                         if (OptAttributes == null)
1020                                 return null;
1021
1022                         Attribute a = OptAttributes.Search (Module.PredefinedAttributes.CoClass);
1023                         if (a == null)
1024                                 return null;
1025
1026                         return a.GetCoClassAttributeValue ();
1027                 }
1028
1029                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
1030                 {
1031                         Attribute a = null;
1032                         if (OptAttributes != null) {
1033                                 a = OptAttributes.Search (pa);
1034                         }
1035
1036                         if (a == null)
1037                                 return null;
1038
1039                         return a.GetAttributeUsageAttribute ();
1040                 }
1041
1042                 public virtual CompilationSourceFile GetCompilationSourceFile ()
1043                 {
1044                         TypeContainer ns = Parent;
1045                         while (true) {
1046                                 var sf = ns as CompilationSourceFile;
1047                                 if (sf != null)
1048                                         return sf;
1049
1050                                 ns = ns.Parent;
1051                         }
1052                 }
1053
1054                 public virtual void AddBasesForPart (List<FullNamedExpression> bases)
1055                 {
1056                         type_bases = bases;
1057                 }
1058
1059                 /// <summary>
1060                 ///   This function computes the Base class and also the
1061                 ///   list of interfaces that the class or struct @c implements.
1062                 ///
1063                 ///   The return value is an array (might be null) of
1064                 ///   interfaces implemented (as Types).
1065                 ///
1066                 ///   The @base_class argument is set to the base object or null
1067                 ///   if this is `System.Object'.
1068                 /// </summary>
1069                 protected virtual TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
1070                 {
1071                         base_class = null;
1072                         if (type_bases == null)
1073                                 return null;
1074
1075                         int count = type_bases.Count;
1076                         TypeSpec[] ifaces = null;
1077                         var base_context = new BaseContext (this);
1078                         for (int i = 0, j = 0; i < count; i++){
1079                                 FullNamedExpression fne = type_bases [i];
1080
1081                                 var fne_resolved = fne.ResolveAsType (base_context);
1082                                 if (fne_resolved == null)
1083                                         continue;
1084
1085                                 if (i == 0 && Kind == MemberKind.Class && !fne_resolved.IsInterface) {
1086                                         if (fne_resolved.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
1087                                                 Report.Error (1965, Location, "Class `{0}' cannot derive from the dynamic type",
1088                                                         GetSignatureForError ());
1089
1090                                                 continue;
1091                                         }
1092
1093                                         base_type = fne_resolved;
1094                                         base_class = fne;
1095                                         continue;
1096                                 }
1097
1098                                 if (ifaces == null)
1099                                         ifaces = new TypeSpec [count - i];
1100
1101                                 if (fne_resolved.IsInterface) {
1102                                         for (int ii = 0; ii < j; ++ii) {
1103                                                 if (fne_resolved == ifaces [ii]) {
1104                                                         Report.Error (528, Location, "`{0}' is already listed in interface list",
1105                                                                 fne_resolved.GetSignatureForError ());
1106                                                         break;
1107                                                 }
1108                                         }
1109
1110                                         if (Kind == MemberKind.Interface && !IsAccessibleAs (fne_resolved)) {
1111                                                 Report.Error (61, fne.Location,
1112                                                         "Inconsistent accessibility: base interface `{0}' is less accessible than interface `{1}'",
1113                                                         fne_resolved.GetSignatureForError (), GetSignatureForError ());
1114                                         }
1115                                 } else {
1116                                         Report.SymbolRelatedToPreviousError (fne_resolved);
1117                                         if (Kind != MemberKind.Class) {
1118                                                 Report.Error (527, fne.Location, "Type `{0}' in interface list is not an interface", fne_resolved.GetSignatureForError ());
1119                                         } else if (base_class != null)
1120                                                 Report.Error (1721, fne.Location, "`{0}': Classes cannot have multiple base classes (`{1}' and `{2}')",
1121                                                         GetSignatureForError (), base_class.GetSignatureForError (), fne_resolved.GetSignatureForError ());
1122                                         else {
1123                                                 Report.Error (1722, fne.Location, "`{0}': Base class `{1}' must be specified as first",
1124                                                         GetSignatureForError (), fne_resolved.GetSignatureForError ());
1125                                         }
1126                                 }
1127
1128                                 ifaces [j++] = fne_resolved;
1129                         }
1130
1131                         return ifaces;
1132                 }
1133
1134                 //
1135                 // Checks that some operators come in pairs:
1136                 //  == and !=
1137                 // > and <
1138                 // >= and <=
1139                 // true and false
1140                 //
1141                 // They are matched based on the return type and the argument types
1142                 //
1143                 void CheckPairedOperators ()
1144                 {
1145                         bool has_equality_or_inequality = false;
1146                         List<Operator.OpType> found_matched = new List<Operator.OpType> ();
1147
1148                         for (int i = 0; i < members.Count; ++i) {
1149                                 var o_a = members[i] as Operator;
1150                                 if (o_a == null)
1151                                         continue;
1152
1153                                 var o_type = o_a.OperatorType;
1154                                 if (o_type == Operator.OpType.Equality || o_type == Operator.OpType.Inequality)
1155                                         has_equality_or_inequality = true;
1156
1157                                 if (found_matched.Contains (o_type))
1158                                         continue;
1159
1160                                 var matching_type = o_a.GetMatchingOperator ();
1161                                 if (matching_type == Operator.OpType.TOP) {
1162                                         continue;
1163                                 }
1164
1165                                 bool pair_found = false;
1166                                 for (int ii = i + 1; ii < members.Count; ++ii) {
1167                                         var o_b = members[ii] as Operator;
1168                                         if (o_b == null || o_b.OperatorType != matching_type)
1169                                                 continue;
1170
1171                                         if (!TypeSpecComparer.IsEqual (o_a.ReturnType, o_b.ReturnType))
1172                                                 continue;
1173
1174                                         if (!TypeSpecComparer.Equals (o_a.ParameterTypes, o_b.ParameterTypes))
1175                                                 continue;
1176
1177                                         found_matched.Add (matching_type);
1178                                         pair_found = true;
1179                                         break;
1180                                 }
1181
1182                                 if (!pair_found) {
1183                                         Report.Error (216, o_a.Location,
1184                                                 "The operator `{0}' requires a matching operator `{1}' to also be defined",
1185                                                 o_a.GetSignatureForError (), Operator.GetName (matching_type));
1186                                 }
1187                         }
1188
1189                         if (has_equality_or_inequality) {
1190                                 if (!HasEquals)
1191                                         Report.Warning (660, 2, Location, "`{0}' defines operator == or operator != but does not override Object.Equals(object o)",
1192                                                 GetSignatureForError ());
1193
1194                                 if (!HasGetHashCode)
1195                                         Report.Warning (661, 2, Location, "`{0}' defines operator == or operator != but does not override Object.GetHashCode()",
1196                                                 GetSignatureForError ());
1197                         }
1198                 }
1199
1200                 public override void CreateMetadataName (StringBuilder sb)
1201                 {
1202                         if (Parent.MemberName != null) {
1203                                 Parent.CreateMetadataName (sb);
1204
1205                                 if (sb.Length != 0) {
1206                                         sb.Append (".");
1207                                 }
1208                         }
1209
1210                         sb.Append (MemberName.Basename);
1211                 }
1212
1213                 bool CreateTypeBuilder ()
1214                 {
1215                         //
1216                         // Sets .size to 1 for structs with no instance fields
1217                         //
1218                         int type_size = Kind == MemberKind.Struct && first_nonstatic_field == null && !(this is StateMachine) ? 1 : 0;
1219
1220                         var parent_def = Parent as TypeDefinition;
1221                         if (parent_def == null) {
1222                                 var sb = new StringBuilder ();
1223                                 CreateMetadataName (sb);
1224                                 TypeBuilder = Module.CreateBuilder (sb.ToString (), TypeAttr, type_size);
1225                         } else {
1226                                 TypeBuilder = parent_def.TypeBuilder.DefineNestedType (Basename, TypeAttr, null, type_size);
1227                         }
1228
1229                         if (DeclaringAssembly.Importer != null)
1230                                 DeclaringAssembly.Importer.AddCompiledType (TypeBuilder, spec);
1231
1232                         spec.SetMetaInfo (TypeBuilder);
1233                         spec.MemberCache = new MemberCache (this);
1234
1235                         TypeParameters parentAllTypeParameters = null;
1236                         if (parent_def != null) {
1237                                 spec.DeclaringType = Parent.CurrentType;
1238                                 parent_def.MemberCache.AddMember (spec);
1239                                 parentAllTypeParameters = parent_def.all_type_parameters;
1240                         }
1241
1242                         if (MemberName.TypeParameters != null || parentAllTypeParameters != null) {
1243                                 var tparam_names = CreateTypeParameters (parentAllTypeParameters);
1244
1245                                 all_tp_builders = TypeBuilder.DefineGenericParameters (tparam_names);
1246
1247                                 if (CurrentTypeParameters != null)
1248                                         CurrentTypeParameters.Define (all_tp_builders, spec, CurrentTypeParametersStartIndex, this);
1249                         }
1250
1251                         return true;
1252                 }
1253
1254                 string[] CreateTypeParameters (TypeParameters parentAllTypeParameters)
1255                 {
1256                         string[] names;
1257                         int parent_offset = 0;
1258                         if (parentAllTypeParameters != null) {
1259                                 if (CurrentTypeParameters == null) {
1260                                         all_type_parameters = parentAllTypeParameters;
1261                                         return parentAllTypeParameters.GetAllNames ();
1262                                 }
1263
1264                                 names = new string[parentAllTypeParameters.Count + CurrentTypeParameters.Count];
1265                                 all_type_parameters = new TypeParameters (names.Length);
1266                                 all_type_parameters.Add (parentAllTypeParameters);
1267
1268                                 parent_offset = all_type_parameters.Count;
1269                                 for (int i = 0; i < parent_offset; ++i)
1270                                         names[i] = all_type_parameters[i].MemberName.Name;
1271
1272                         } else {
1273                                 names = new string[CurrentTypeParameters.Count];
1274                         }
1275
1276                         for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
1277                                 if (all_type_parameters != null)
1278                                         all_type_parameters.Add (MemberName.TypeParameters[i]);
1279
1280                                 var name = CurrentTypeParameters[i].MemberName.Name;
1281                                 names[parent_offset + i] = name;
1282                                 for (int ii = 0; ii < parent_offset + i; ++ii) {
1283                                         if (names[ii] != name)
1284                                                 continue;
1285
1286                                         var tp = CurrentTypeParameters[i];
1287                                         var conflict = all_type_parameters[ii];
1288
1289                                         tp.WarningParentNameConflict (conflict);
1290                                 }
1291                         }
1292
1293                         if (all_type_parameters == null)
1294                                 all_type_parameters = CurrentTypeParameters;
1295
1296                         return names;
1297                 }
1298
1299
1300                 public SourceMethodBuilder CreateMethodSymbolEntry ()
1301                 {
1302                         if (Module.DeclaringAssembly.SymbolWriter == null)
1303                                 return null;
1304
1305                         var source_file = GetCompilationSourceFile ();
1306                         if (source_file == null)
1307                                 return null;
1308
1309                         return new SourceMethodBuilder (source_file.SymbolUnitEntry);
1310                 }
1311
1312                 //
1313                 // Creates a proxy base method call inside this container for hoisted base member calls
1314                 //
1315                 public MethodSpec CreateHoistedBaseCallProxy (ResolveContext rc, MethodSpec method)
1316                 {
1317                         Method proxy_method;
1318
1319                         //
1320                         // One proxy per base method is enough
1321                         //
1322                         if (hoisted_base_call_proxies == null) {
1323                                 hoisted_base_call_proxies = new Dictionary<MethodSpec, Method> ();
1324                                 proxy_method = null;
1325                         } else {
1326                                 hoisted_base_call_proxies.TryGetValue (method, out proxy_method);
1327                         }
1328
1329                         if (proxy_method == null) {
1330                                 string name = CompilerGeneratedContainer.MakeName (method.Name, null, "BaseCallProxy", hoisted_base_call_proxies.Count);
1331                                 var base_parameters = new Parameter[method.Parameters.Count];
1332                                 for (int i = 0; i < base_parameters.Length; ++i) {
1333                                         var base_param = method.Parameters.FixedParameters[i];
1334                                         base_parameters[i] = new Parameter (new TypeExpression (method.Parameters.Types[i], Location),
1335                                                 base_param.Name, base_param.ModFlags, null, Location);
1336                                         base_parameters[i].Resolve (this, i);
1337                                 }
1338
1339                                 var cloned_params = ParametersCompiled.CreateFullyResolved (base_parameters, method.Parameters.Types);
1340                                 if (method.Parameters.HasArglist) {
1341                                         cloned_params.FixedParameters[0] = new Parameter (null, "__arglist", Parameter.Modifier.NONE, null, Location);
1342                                         cloned_params.Types[0] = Module.PredefinedTypes.RuntimeArgumentHandle.Resolve ();
1343                                 }
1344
1345                                 MemberName member_name;
1346                                 TypeArguments targs = null;
1347                                 if (method.IsGeneric) {
1348                                         //
1349                                         // Copy all base generic method type parameters info
1350                                         //
1351                                         var hoisted_tparams = method.GenericDefinition.TypeParameters;
1352                                         var tparams = new TypeParameters ();
1353
1354                                         targs = new TypeArguments ();
1355                                         targs.Arguments = new TypeSpec[hoisted_tparams.Length];
1356                                         for (int i = 0; i < hoisted_tparams.Length; ++i) {
1357                                                 var tp = hoisted_tparams[i];
1358                                                 tparams.Add (new TypeParameter (tp, null, new MemberName (tp.Name, Location), null));
1359
1360                                                 targs.Add (new SimpleName (tp.Name, Location));
1361                                                 targs.Arguments[i] = tp;
1362                                         }
1363
1364                                         member_name = new MemberName (name, tparams, Location);
1365                                 } else {
1366                                         member_name = new MemberName (name);
1367                                 }
1368
1369                                 // Compiler generated proxy
1370                                 proxy_method = new Method (this, new TypeExpression (method.ReturnType, Location),
1371                                         Modifiers.PRIVATE | Modifiers.COMPILER_GENERATED | Modifiers.DEBUGGER_HIDDEN,
1372                                         member_name, cloned_params, null);
1373
1374                                 var block = new ToplevelBlock (Compiler, proxy_method.ParameterInfo, Location) {
1375                                         IsCompilerGenerated = true
1376                                 };
1377
1378                                 var mg = MethodGroupExpr.CreatePredefined (method, method.DeclaringType, Location);
1379                                 mg.InstanceExpression = new BaseThis (method.DeclaringType, Location);
1380                                 if (targs != null)
1381                                         mg.SetTypeArguments (rc, targs);
1382
1383                                 // Get all the method parameters and pass them as arguments
1384                                 var real_base_call = new Invocation (mg, block.GetAllParametersArguments ());
1385                                 Statement statement;
1386                                 if (method.ReturnType.Kind == MemberKind.Void)
1387                                         statement = new StatementExpression (real_base_call);
1388                                 else
1389                                         statement = new Return (real_base_call, Location);
1390
1391                                 block.AddStatement (statement);
1392                                 proxy_method.Block = block;
1393
1394                                 members.Add (proxy_method);
1395                                 proxy_method.Define ();
1396
1397                                 hoisted_base_call_proxies.Add (method, proxy_method);
1398                         }
1399
1400                         return proxy_method.Spec;
1401                 }
1402
1403                 protected bool DefineBaseTypes ()
1404                 {
1405                         iface_exprs = ResolveBaseTypes (out base_type_expr);
1406                         bool set_base_type;
1407
1408                         if (IsPartialPart) {
1409                                 set_base_type = false;
1410
1411                                 if (base_type_expr != null) {
1412                                         if (PartialContainer.base_type_expr != null && PartialContainer.base_type != base_type) {
1413                                                 Report.SymbolRelatedToPreviousError (base_type_expr.Location, "");
1414                                                 Report.Error (263, Location,
1415                                                         "Partial declarations of `{0}' must not specify different base classes",
1416                                                         GetSignatureForError ());
1417                                         } else {
1418                                                 PartialContainer.base_type_expr = base_type_expr;
1419                                                 PartialContainer.base_type = base_type;
1420                                                 set_base_type = true;
1421                                         }
1422                                 }
1423
1424                                 if (iface_exprs != null) {
1425                                         if (PartialContainer.iface_exprs == null)
1426                                                 PartialContainer.iface_exprs = iface_exprs;
1427                                         else {
1428                                                 var ifaces = new List<TypeSpec> (PartialContainer.iface_exprs);
1429                                                 foreach (var iface_partial in iface_exprs) {
1430                                                         if (ifaces.Contains (iface_partial))
1431                                                                 continue;
1432
1433                                                         ifaces.Add (iface_partial);
1434                                                 }
1435
1436                                                 PartialContainer.iface_exprs = ifaces.ToArray ();
1437                                         }
1438                                 }
1439
1440                                 PartialContainer.members.AddRange (members);
1441                                 if (containers != null) {
1442                                         if (PartialContainer.containers == null)
1443                                                 PartialContainer.containers = new List<TypeContainer> ();
1444
1445                                         PartialContainer.containers.AddRange (containers);
1446                                 }
1447
1448                                 members_defined = members_defined_ok = true;
1449                                 caching_flags |= Flags.CloseTypeCreated;
1450                         } else {
1451                                 set_base_type = true;
1452                         }
1453
1454                         var cycle = CheckRecursiveDefinition (this);
1455                         if (cycle != null) {
1456                                 Report.SymbolRelatedToPreviousError (cycle);
1457                                 if (this is Interface) {
1458                                         Report.Error (529, Location,
1459                                                 "Inherited interface `{0}' causes a cycle in the interface hierarchy of `{1}'",
1460                                             GetSignatureForError (), cycle.GetSignatureForError ());
1461
1462                                         iface_exprs = null;
1463                                 } else {
1464                                         Report.Error (146, Location,
1465                                                 "Circular base class dependency involving `{0}' and `{1}'",
1466                                                 GetSignatureForError (), cycle.GetSignatureForError ());
1467
1468                                         base_type = null;
1469                                 }
1470                         }
1471
1472                         if (iface_exprs != null) {
1473                                 foreach (var iface_type in iface_exprs) {
1474                                         // Prevents a crash, the interface might not have been resolved: 442144
1475                                         if (iface_type == null)
1476                                                 continue;
1477
1478                                         if (!spec.AddInterfaceDefined (iface_type))
1479                                                 continue;
1480
1481                                         TypeBuilder.AddInterfaceImplementation (iface_type.GetMetaInfo ());
1482
1483                                         // Ensure the base is always setup
1484                                         var compiled_iface = iface_type.MemberDefinition as Interface;
1485                                         if (compiled_iface != null) {
1486                                                 // TODO: Need DefineBaseType only
1487                                                 compiled_iface.DefineContainer ();
1488                                         }
1489
1490                                         if (iface_type.Interfaces != null) {
1491                                                 var base_ifaces = new List<TypeSpec> (iface_type.Interfaces);
1492                                                 for (int i = 0; i < base_ifaces.Count; ++i) {
1493                                                         var ii_iface_type = base_ifaces[i];
1494                                                         if (spec.AddInterfaceDefined (ii_iface_type)) {
1495                                                                 TypeBuilder.AddInterfaceImplementation (ii_iface_type.GetMetaInfo ());
1496
1497                                                                 if (ii_iface_type.Interfaces != null)
1498                                                                         base_ifaces.AddRange (ii_iface_type.Interfaces);
1499                                                         }
1500                                                 }
1501                                         }
1502                                 }
1503                         }
1504
1505                         if (Kind == MemberKind.Interface) {
1506                                 spec.BaseType = Compiler.BuiltinTypes.Object;
1507                                 return true;
1508                         }
1509
1510                         if (set_base_type) {
1511                                 if (base_type != null) {
1512                                         spec.BaseType = base_type;
1513
1514                                         // Set base type after type creation
1515                                         TypeBuilder.SetParent (base_type.GetMetaInfo ());
1516                                 } else {
1517                                         TypeBuilder.SetParent (null);
1518                                 }
1519                         }
1520
1521                         return true;
1522                 }
1523
1524                 public override void PrepareEmit ()
1525                 {
1526                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
1527                                 return;
1528
1529                         foreach (var member in members) {
1530                                 var pm = member as IParametersMember;
1531                                 if (pm != null) {
1532
1533                                         var p = pm.Parameters;
1534                                         if (p.IsEmpty)
1535                                                 continue;
1536
1537                                         ((ParametersCompiled) p).ResolveDefaultValues (member);
1538                                 }
1539
1540                                 var c = member as Const;
1541                                 if (c != null)
1542                                         c.DefineValue ();
1543                         }
1544
1545                         base.PrepareEmit ();
1546                 }
1547
1548                 //
1549                 // Defines the type in the appropriate ModuleBuilder or TypeBuilder.
1550                 //
1551                 public override bool CreateContainer ()
1552                 {
1553                         if (TypeBuilder != null)
1554                                 return !error;
1555
1556                         if (error)
1557                                 return false;
1558
1559                         if (IsPartialPart) {
1560                                 spec = PartialContainer.spec;
1561                                 TypeBuilder = PartialContainer.TypeBuilder;
1562                                 all_tp_builders = PartialContainer.all_tp_builders;
1563                                 all_type_parameters = PartialContainer.all_type_parameters;
1564                         } else {
1565                                 if (!CreateTypeBuilder ()) {
1566                                         error = true;
1567                                         return false;
1568                                 }
1569                         }
1570
1571                         return base.CreateContainer ();
1572                 }
1573
1574                 protected override void DoDefineContainer ()
1575                 {
1576                         DefineBaseTypes ();
1577
1578                         DoResolveTypeParameters ();
1579                 }
1580
1581                 //
1582                 // Replaces normal spec with predefined one when compiling corlib
1583                 // and this type container defines predefined type
1584                 //
1585                 public void SetPredefinedSpec (BuiltinTypeSpec spec)
1586                 {
1587                         // When compiling build-in types we start with two
1588                         // version of same type. One is of BuiltinTypeSpec and
1589                         // second one is ordinary TypeSpec. The unification
1590                         // happens at later stage when we know which type
1591                         // really matches the builtin type signature. However
1592                         // that means TypeSpec create during CreateType of this
1593                         // type has to be replaced with builtin one
1594                         //
1595                         spec.SetMetaInfo (TypeBuilder);
1596                         spec.MemberCache = this.spec.MemberCache;
1597                         spec.DeclaringType = this.spec.DeclaringType;
1598
1599                         this.spec = spec;
1600                         current_type = null;
1601                 }
1602
1603                 void UpdateTypeParameterConstraints (TypeDefinition part)
1604                 {
1605                         for (int i = 0; i < CurrentTypeParameters.Count; i++) {
1606                                 if (CurrentTypeParameters[i].AddPartialConstraints (part, part.MemberName.TypeParameters[i]))
1607                                         continue;
1608
1609                                 Report.SymbolRelatedToPreviousError (Location, "");
1610                                 Report.Error (265, part.Location,
1611                                         "Partial declarations of `{0}' have inconsistent constraints for type parameter `{1}'",
1612                                         GetSignatureForError (), CurrentTypeParameters[i].GetSignatureForError ());
1613                         }
1614                 }
1615
1616                 public override void RemoveContainer (TypeContainer cont)
1617                 {
1618                         base.RemoveContainer (cont);
1619                         Members.Remove (cont);
1620                         Cache.Remove (cont.Basename);
1621                 }
1622
1623                 protected virtual bool DoResolveTypeParameters ()
1624                 {
1625                         var tparams = CurrentTypeParameters;
1626                         if (tparams == null)
1627                                 return true;
1628
1629                         var base_context = new BaseContext (this);
1630                         for (int i = 0; i < tparams.Count; ++i) {
1631                                 var tp = tparams[i];
1632
1633                                 if (!tp.ResolveConstraints (base_context)) {
1634                                         error = true;
1635                                         return false;
1636                                 }
1637                         }
1638
1639                         if (IsPartialPart) {
1640                                 PartialContainer.UpdateTypeParameterConstraints (this);
1641                         }
1642
1643                         return true;
1644                 }
1645
1646                 TypeSpec CheckRecursiveDefinition (TypeDefinition tc)
1647                 {
1648                         if (InTransit != null)
1649                                 return spec;
1650
1651                         InTransit = tc;
1652
1653                         if (base_type != null) {
1654                                 var ptc = base_type.MemberDefinition as TypeDefinition;
1655                                 if (ptc != null && ptc.CheckRecursiveDefinition (this) != null)
1656                                         return base_type;
1657                         }
1658
1659                         if (iface_exprs != null) {
1660                                 foreach (var iface in iface_exprs) {
1661                                         // the interface might not have been resolved, prevents a crash, see #442144
1662                                         if (iface == null)
1663                                                 continue;
1664                                         var ptc = iface.MemberDefinition as Interface;
1665                                         if (ptc != null && ptc.CheckRecursiveDefinition (this) != null)
1666                                                 return iface;
1667                                 }
1668                         }
1669
1670                         if (!IsTopLevel && Parent.PartialContainer.CheckRecursiveDefinition (this) != null)
1671                                 return spec;
1672
1673                         InTransit = null;
1674                         return null;
1675                 }
1676
1677                 /// <summary>
1678                 ///   Populates our TypeBuilder with fields and methods
1679                 /// </summary>
1680                 public sealed override bool Define ()
1681                 {
1682                         if (members_defined)
1683                                 return members_defined_ok;
1684
1685                         members_defined_ok = DoDefineMembers ();
1686                         members_defined = true;
1687
1688                         base.Define ();
1689
1690                         return members_defined_ok;
1691                 }
1692
1693                 protected virtual bool DoDefineMembers ()
1694                 {
1695                         Debug.Assert (!IsPartialPart);
1696
1697                         if (iface_exprs != null) {
1698                                 foreach (var iface_type in iface_exprs) {
1699                                         if (iface_type == null)
1700                                                 continue;
1701
1702                                         // Ensure the base is always setup
1703                                         var compiled_iface = iface_type.MemberDefinition as Interface;
1704                                         if (compiled_iface != null)
1705                                                 compiled_iface.Define ();
1706
1707                                         if (Kind == MemberKind.Interface)
1708                                                 MemberCache.AddInterface (iface_type);
1709
1710                                         ObsoleteAttribute oa = iface_type.GetAttributeObsolete ();
1711                                         if (oa != null && !IsObsolete)
1712                                                 AttributeTester.Report_ObsoleteMessage (oa, iface_type.GetSignatureForError (), Location, Report);
1713
1714                                         if (iface_type.Arity > 0) {
1715                                                 // TODO: passing `this' is wrong, should be base type iface instead
1716                                                 TypeManager.CheckTypeVariance (iface_type, Variance.Covariant, this);
1717
1718                                                 if (((InflatedTypeSpec) iface_type).HasDynamicArgument () && !IsCompilerGenerated) {
1719                                                         Report.Error (1966, Location,
1720                                                                 "`{0}': cannot implement a dynamic interface `{1}'",
1721                                                                 GetSignatureForError (), iface_type.GetSignatureForError ());
1722                                                         return false;
1723                                                 }
1724                                         }
1725
1726                                         if (iface_type.IsGenericOrParentIsGeneric) {
1727                                                 if (spec.Interfaces != null) {
1728                                                         foreach (var prev_iface in iface_exprs) {
1729                                                                 if (prev_iface == iface_type)
1730                                                                         break;
1731
1732                                                                 if (!TypeSpecComparer.Unify.IsEqual (iface_type, prev_iface))
1733                                                                         continue;
1734
1735                                                                 Report.Error (695, Location,
1736                                                                         "`{0}' cannot implement both `{1}' and `{2}' because they may unify for some type parameter substitutions",
1737                                                                         GetSignatureForError (), prev_iface.GetSignatureForError (), iface_type.GetSignatureForError ());
1738                                                         }
1739                                                 }
1740                                         }
1741                                 }
1742                         }
1743
1744                         if (base_type != null) {
1745                                 //
1746                                 // Run checks skipped during DefineType (e.g FullNamedExpression::ResolveAsType)
1747                                 //
1748                                 if (base_type_expr != null) {
1749                                         ObsoleteAttribute obsolete_attr = base_type.GetAttributeObsolete ();
1750                                         if (obsolete_attr != null && !IsObsolete)
1751                                                 AttributeTester.Report_ObsoleteMessage (obsolete_attr, base_type.GetSignatureForError (), base_type_expr.Location, Report);
1752
1753                                         if (IsGenericOrParentIsGeneric && base_type.IsAttribute) {
1754                                                 Report.Error (698, base_type_expr.Location,
1755                                                         "A generic type cannot derive from `{0}' because it is an attribute class",
1756                                                         base_type.GetSignatureForError ());
1757                                         }
1758                                 }
1759
1760                                 if (base_type.Interfaces != null) {
1761                                         foreach (var iface in base_type.Interfaces)
1762                                                 spec.AddInterface (iface);
1763                                 }
1764
1765                                 var baseContainer = base_type.MemberDefinition as ClassOrStruct;
1766                                 if (baseContainer != null) {
1767                                         baseContainer.Define ();
1768
1769                                         //
1770                                         // It can trigger define of this type (for generic types only)
1771                                         //
1772                                         if (HasMembersDefined)
1773                                                 return true;
1774                                 }
1775                         }
1776
1777                         if (Kind == MemberKind.Struct || Kind == MemberKind.Class) {
1778                                 pending = PendingImplementation.GetPendingImplementations (this);
1779                         }
1780
1781                         var count = members.Count;
1782                         for (int i = 0; i < count; ++i) {
1783                                 var mc = members[i] as InterfaceMemberBase;
1784                                 if (mc == null || !mc.IsExplicitImpl)
1785                                         continue;
1786
1787                                 try {
1788                                         mc.Define ();
1789                                 } catch (Exception e) {
1790                                         throw new InternalErrorException (mc, e);
1791                                 }
1792                         }
1793
1794                         for (int i = 0; i < count; ++i) {
1795                                 var mc = members[i] as InterfaceMemberBase;
1796                                 if (mc != null && mc.IsExplicitImpl)
1797                                         continue;
1798
1799                                 if (members[i] is TypeContainer)
1800                                         continue;
1801
1802                                 try {
1803                                         members[i].Define ();
1804                                 } catch (Exception e) {
1805                                         throw new InternalErrorException (members[i], e);
1806                                 }
1807                         }
1808
1809                         if (HasOperators) {
1810                                 CheckPairedOperators ();
1811                         }
1812
1813                         if (requires_delayed_unmanagedtype_check) {
1814                                 requires_delayed_unmanagedtype_check = false;
1815                                 foreach (var member in members) {
1816                                         var f = member as Field;
1817                                         if (f != null && f.MemberType != null && f.MemberType.IsPointer)
1818                                                 TypeManager.VerifyUnmanaged (Module, f.MemberType, f.Location);
1819                                 }
1820                         }
1821
1822                         ComputeIndexerName();
1823
1824                         if (HasEquals && !HasGetHashCode) {
1825                                 Report.Warning (659, 3, Location,
1826                                         "`{0}' overrides Object.Equals(object) but does not override Object.GetHashCode()", GetSignatureForError ());
1827                         }
1828
1829                         if (Kind == MemberKind.Interface && iface_exprs != null) {
1830                                 MemberCache.RemoveHiddenMembers (spec);
1831                         }
1832
1833                         return true;
1834                 }
1835
1836                 void ComputeIndexerName ()
1837                 {
1838                         var indexers = MemberCache.FindMembers (spec, MemberCache.IndexerNameAlias, true);
1839                         if (indexers == null)
1840                                 return;
1841
1842                         string class_indexer_name = null;
1843
1844                         //
1845                         // Check normal indexers for consistent name, explicit interface implementation
1846                         // indexers are ignored
1847                         //
1848                         foreach (var indexer in indexers) {
1849                                 //
1850                                 // FindMembers can return unfiltered full hierarchy names
1851                                 //
1852                                 if (indexer.DeclaringType != spec)
1853                                         continue;
1854
1855                                 has_normal_indexers = true;
1856
1857                                 if (class_indexer_name == null) {
1858                                         indexer_name = class_indexer_name = indexer.Name;
1859                                         continue;
1860                                 }
1861
1862                                 if (indexer.Name != class_indexer_name)
1863                                         Report.Error (668, ((Indexer)indexer.MemberDefinition).Location,
1864                                                 "Two indexers have different names; the IndexerName attribute must be used with the same name on every indexer within a type");
1865                         }
1866                 }
1867
1868                 void EmitIndexerName ()
1869                 {
1870                         if (!has_normal_indexers)
1871                                 return;
1872
1873                         var ctor = Module.PredefinedMembers.DefaultMemberAttributeCtor.Get ();
1874                         if (ctor == null)
1875                                 return;
1876
1877                         var encoder = new AttributeEncoder ();
1878                         encoder.Encode (GetAttributeDefaultMember ());
1879                         encoder.EncodeEmptyNamedArguments ();
1880
1881                         TypeBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), encoder.ToArray ());
1882                 }
1883
1884                 public override void VerifyMembers ()
1885                 {
1886                         //
1887                         // Check for internal or private fields that were never assigned
1888                         //
1889                         if (!IsCompilerGenerated && Compiler.Settings.WarningLevel >= 3 && this == PartialContainer) {
1890                                 bool is_type_exposed = Kind == MemberKind.Struct || IsExposedFromAssembly ();
1891                                 foreach (var member in members) {
1892                                         if (member is Event) {
1893                                                 //
1894                                                 // An event can be assigned from same class only, so we can report
1895                                                 // this warning for all accessibility modes
1896                                                 //
1897                                                 if (!member.IsUsed)
1898                                                         Report.Warning (67, 3, member.Location, "The event `{0}' is never used", member.GetSignatureForError ());
1899
1900                                                 continue;
1901                                         }
1902
1903                                         if ((member.ModFlags & Modifiers.AccessibilityMask) != Modifiers.PRIVATE) {
1904                                                 if (is_type_exposed)
1905                                                         continue;
1906
1907                                                 member.SetIsUsed ();
1908                                         }
1909
1910                                         var f = member as Field;
1911                                         if (f == null)
1912                                                 continue;
1913
1914                                         if (!member.IsUsed) {
1915                                                 if ((member.caching_flags & Flags.IsAssigned) == 0) {
1916                                                         Report.Warning (169, 3, member.Location, "The private field `{0}' is never used", member.GetSignatureForError ());
1917                                                 } else {
1918                                                         Report.Warning (414, 3, member.Location, "The private field `{0}' is assigned but its value is never used",
1919                                                                 member.GetSignatureForError ());
1920                                                 }
1921                                                 continue;
1922                                         }
1923
1924                                         if ((f.caching_flags & Flags.IsAssigned) != 0)
1925                                                 continue;
1926
1927                                         //
1928                                         // Only report 649 on level 4
1929                                         //
1930                                         if (Compiler.Settings.WarningLevel < 4)
1931                                                 continue;
1932
1933                                         //
1934                                         // Don't be pedantic when type requires specific layout
1935                                         //
1936                                         if (f.OptAttributes != null || PartialContainer.HasStructLayout)
1937                                                 continue;
1938
1939                                         Constant c = New.Constantify (f.MemberType, f.Location);
1940                                         string value;
1941                                         if (c != null) {
1942                                                 value = c.GetValueAsLiteral ();
1943                                         } else if (TypeSpec.IsReferenceType (f.MemberType)) {
1944                                                 value = "null";
1945                                         } else {
1946                                                 value = null;
1947                                         }
1948
1949                                         if (value != null)
1950                                                 value = " `" + value + "'";
1951
1952                                         Report.Warning (649, 4, f.Location, "Field `{0}' is never assigned to, and will always have its default value{1}",
1953                                                 f.GetSignatureForError (), value);
1954                                 }
1955                         }
1956
1957                         base.VerifyMembers ();
1958                 }
1959
1960                 public override void Emit ()
1961                 {
1962                         if (OptAttributes != null)
1963                                 OptAttributes.Emit ();
1964
1965                         if (!IsCompilerGenerated) {
1966                                 if (!IsTopLevel) {
1967                                         MemberSpec candidate;
1968                                         bool overrides = false;
1969                                         var conflict_symbol = MemberCache.FindBaseMember (this, out candidate, ref overrides);
1970                                         if (conflict_symbol == null && candidate == null) {
1971                                                 if ((ModFlags & Modifiers.NEW) != 0)
1972                                                         Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required",
1973                                                                 GetSignatureForError ());
1974                                         } else {
1975                                                 if ((ModFlags & Modifiers.NEW) == 0) {
1976                                                         if (candidate == null)
1977                                                                 candidate = conflict_symbol;
1978
1979                                                         Report.SymbolRelatedToPreviousError (candidate);
1980                                                         Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended",
1981                                                                 GetSignatureForError (), candidate.GetSignatureForError ());
1982                                                 }
1983                                         }
1984                                 }
1985
1986                                 // Run constraints check on all possible generic types
1987                                 if (base_type != null && base_type_expr != null) {
1988                                         ConstraintChecker.Check (this, base_type, base_type_expr.Location);
1989                                 }
1990
1991                                 if (iface_exprs != null) {
1992                                         foreach (var iface_type in iface_exprs) {
1993                                                 if (iface_type == null)
1994                                                         continue;
1995
1996                                                 ConstraintChecker.Check (this, iface_type, Location);   // TODO: Location is wrong
1997                                         }
1998                                 }
1999                         }
2000
2001                         if (all_tp_builders != null) {
2002                                 int current_starts_index = CurrentTypeParametersStartIndex;
2003                                 for (int i = 0; i < all_tp_builders.Length; i++) {
2004                                         if (i < current_starts_index) {
2005                                                 all_type_parameters[i].EmitConstraints (all_tp_builders [i]);
2006                                         } else {
2007                                                 var tp = CurrentTypeParameters [i - current_starts_index];
2008                                                 tp.CheckGenericConstraints (!IsObsolete);
2009                                                 tp.Emit ();
2010                                         }
2011                                 }
2012                         }
2013
2014                         if ((ModFlags & Modifiers.COMPILER_GENERATED) != 0 && !Parent.IsCompilerGenerated)
2015                                 Module.PredefinedAttributes.CompilerGenerated.EmitAttribute (TypeBuilder);
2016
2017 #if STATIC
2018                         if ((TypeBuilder.Attributes & TypeAttributes.StringFormatMask) == 0 && Module.HasDefaultCharSet)
2019                                 TypeBuilder.__SetAttributes (TypeBuilder.Attributes | Module.DefaultCharSetType);
2020 #endif
2021
2022                         base.Emit ();
2023
2024                         for (int i = 0; i < members.Count; i++)
2025                                 members[i].Emit ();
2026
2027                         EmitIndexerName ();
2028                         CheckAttributeClsCompliance ();
2029
2030                         if (pending != null)
2031                                 pending.VerifyPendingMethods ();
2032                 }
2033
2034
2035                 void CheckAttributeClsCompliance ()
2036                 {
2037                         if (!spec.IsAttribute || !IsExposedFromAssembly () || !Compiler.Settings.VerifyClsCompliance || !IsClsComplianceRequired ())
2038                                 return;
2039
2040                         foreach (var m in members) {
2041                                 var c = m as Constructor;
2042                                 if (c == null)
2043                                         continue;
2044
2045                                 if (c.HasCompliantArgs)
2046                                         return;
2047                         }
2048
2049                         Report.Warning (3015, 1, Location, "`{0}' has no accessible constructors which use only CLS-compliant types", GetSignatureForError ());
2050                 }
2051
2052                 public sealed override void EmitContainer ()
2053                 {
2054                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
2055                                 return;
2056
2057                         Emit ();
2058                 }
2059
2060                 public override void CloseContainer ()
2061                 {
2062                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
2063                                 return;
2064
2065                         // Close base type container first to avoid TypeLoadException
2066                         if (spec.BaseType != null) {
2067                                 var btype = spec.BaseType.MemberDefinition as TypeContainer;
2068                                 if (btype != null) {
2069                                         btype.CloseContainer ();
2070
2071                                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
2072                                                 return;
2073                                 }
2074                         }
2075
2076                         try {
2077                                 caching_flags |= Flags.CloseTypeCreated;
2078                                 TypeBuilder.CreateType ();
2079                         } catch (TypeLoadException) {
2080                                 //
2081                                 // This is fine, the code still created the type
2082                                 //
2083                         } catch (Exception e) {
2084                                 throw new InternalErrorException (this, e);
2085                         }
2086
2087                         base.CloseContainer ();
2088
2089                         containers = null;
2090                         initialized_fields = null;
2091                         initialized_static_fields = null;
2092                         type_bases = null;
2093                         OptAttributes = null;
2094                 }
2095
2096                 //
2097                 // Performs the validation on a Method's modifiers (properties have
2098                 // the same properties).
2099                 //
2100                 // TODO: Why is it not done at parse stage, move to Modifiers::Check
2101                 //
2102                 public bool MethodModifiersValid (MemberCore mc)
2103                 {
2104                         const Modifiers vao = (Modifiers.VIRTUAL | Modifiers.ABSTRACT | Modifiers.OVERRIDE);
2105                         const Modifiers nv = (Modifiers.NEW | Modifiers.VIRTUAL);
2106                         bool ok = true;
2107                         var flags = mc.ModFlags;
2108
2109                         //
2110                         // At most one of static, virtual or override
2111                         //
2112                         if ((flags & Modifiers.STATIC) != 0){
2113                                 if ((flags & vao) != 0){
2114                                         Report.Error (112, mc.Location, "A static member `{0}' cannot be marked as override, virtual or abstract",
2115                                                 mc.GetSignatureForError ());
2116                                         ok = false;
2117                                 }
2118                         }
2119
2120                         if ((flags & Modifiers.OVERRIDE) != 0 && (flags & nv) != 0){
2121                                 Report.Error (113, mc.Location, "A member `{0}' marked as override cannot be marked as new or virtual",
2122                                         mc.GetSignatureForError ());
2123                                 ok = false;
2124                         }
2125
2126                         //
2127                         // If the declaration includes the abstract modifier, then the
2128                         // declaration does not include static, virtual or extern
2129                         //
2130                         if ((flags & Modifiers.ABSTRACT) != 0){
2131                                 if ((flags & Modifiers.EXTERN) != 0){
2132                                         Report.Error (
2133                                                 180, mc.Location, "`{0}' cannot be both extern and abstract", mc.GetSignatureForError ());
2134                                         ok = false;
2135                                 }
2136
2137                                 if ((flags & Modifiers.SEALED) != 0) {
2138                                         Report.Error (502, mc.Location, "`{0}' cannot be both abstract and sealed", mc.GetSignatureForError ());
2139                                         ok = false;
2140                                 }
2141
2142                                 if ((flags & Modifiers.VIRTUAL) != 0){
2143                                         Report.Error (503, mc.Location, "The abstract method `{0}' cannot be marked virtual", mc.GetSignatureForError ());
2144                                         ok = false;
2145                                 }
2146
2147                                 if ((ModFlags & Modifiers.ABSTRACT) == 0){
2148                                         Report.SymbolRelatedToPreviousError (this);
2149                                         Report.Error (513, mc.Location, "`{0}' is abstract but it is declared in the non-abstract class `{1}'",
2150                                                 mc.GetSignatureForError (), GetSignatureForError ());
2151                                         ok = false;
2152                                 }
2153                         }
2154
2155                         if ((flags & Modifiers.PRIVATE) != 0){
2156                                 if ((flags & vao) != 0){
2157                                         Report.Error (621, mc.Location, "`{0}': virtual or abstract members cannot be private", mc.GetSignatureForError ());
2158                                         ok = false;
2159                                 }
2160                         }
2161
2162                         if ((flags & Modifiers.SEALED) != 0){
2163                                 if ((flags & Modifiers.OVERRIDE) == 0){
2164                                         Report.Error (238, mc.Location, "`{0}' cannot be sealed because it is not an override", mc.GetSignatureForError ());
2165                                         ok = false;
2166                                 }
2167                         }
2168
2169                         return ok;
2170                 }
2171
2172                 protected override bool VerifyClsCompliance ()
2173                 {
2174                         if (!base.VerifyClsCompliance ())
2175                                 return false;
2176
2177                         // Check all container names for user classes
2178                         if (Kind != MemberKind.Delegate)
2179                                 MemberCache.VerifyClsCompliance (Definition, Report);
2180
2181                         if (BaseType != null && !BaseType.IsCLSCompliant ()) {
2182                                 Report.Warning (3009, 1, Location, "`{0}': base type `{1}' is not CLS-compliant",
2183                                         GetSignatureForError (), BaseType.GetSignatureForError ());
2184                         }
2185                         return true;
2186                 }
2187
2188                 /// <summary>
2189                 ///   Performs checks for an explicit interface implementation.  First it
2190                 ///   checks whether the `interface_type' is a base inteface implementation.
2191                 ///   Then it checks whether `name' exists in the interface type.
2192                 /// </summary>
2193                 public bool VerifyImplements (InterfaceMemberBase mb)
2194                 {
2195                         var ifaces = spec.Interfaces;
2196                         if (ifaces != null) {
2197                                 foreach (TypeSpec t in ifaces){
2198                                         if (t == mb.InterfaceType)
2199                                                 return true;
2200                                 }
2201                         }
2202
2203                         Report.SymbolRelatedToPreviousError (mb.InterfaceType);
2204                         Report.Error (540, mb.Location, "`{0}': containing type does not implement interface `{1}'",
2205                                 mb.GetSignatureForError (), TypeManager.CSharpName (mb.InterfaceType));
2206                         return false;
2207                 }
2208
2209                 //
2210                 // Used for visiblity checks to tests whether this definition shares
2211                 // base type baseType, it does member-definition search
2212                 //
2213                 public bool IsBaseTypeDefinition (TypeSpec baseType)
2214                 {
2215                         // RootContext check
2216                         if (TypeBuilder == null)
2217                                 return false;
2218
2219                         var type = spec;
2220                         do {
2221                                 if (type.MemberDefinition == baseType.MemberDefinition)
2222                                         return true;
2223
2224                                 type = type.BaseType;
2225                         } while (type != null);
2226
2227                         return false;
2228                 }
2229
2230                 public override bool IsClsComplianceRequired ()
2231                 {
2232                         if (IsPartialPart)
2233                                 return PartialContainer.IsClsComplianceRequired ();
2234
2235                         return base.IsClsComplianceRequired ();
2236                 }
2237
2238                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2239                 {
2240                         return Module.DeclaringAssembly == assembly;
2241                 }
2242
2243                 public virtual bool IsUnmanagedType ()
2244                 {
2245                         return false;
2246                 }
2247
2248                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2249                 {
2250                         throw new NotSupportedException ("Not supported for compiled definition " + GetSignatureForError ());
2251                 }
2252
2253                 //
2254                 // Public function used to locate types.
2255                 //
2256                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
2257                 //
2258                 // Returns: Type or null if they type can not be found.
2259                 //
2260                 public override FullNamedExpression LookupNamespaceOrType (string name, int arity, LookupMode mode, Location loc)
2261                 {
2262                         FullNamedExpression e;
2263                         if (arity == 0 && Cache.TryGetValue (name, out e) && mode != LookupMode.IgnoreAccessibility)
2264                                 return e;
2265
2266                         e = null;
2267
2268                         if (arity == 0) {
2269                                 var tp = CurrentTypeParameters;
2270                                 if (tp != null) {
2271                                         TypeParameter tparam = tp.Find (name);
2272                                         if (tparam != null)
2273                                                 e = new TypeParameterExpr (tparam, Location.Null);
2274                                 }
2275                         }
2276
2277                         if (e == null) {
2278                                 TypeSpec t = LookupNestedTypeInHierarchy (name, arity);
2279
2280                                 if (t != null && (t.IsAccessible (this) || mode == LookupMode.IgnoreAccessibility))
2281                                         e = new TypeExpression (t, Location.Null);
2282                                 else {
2283                                         e = Parent.LookupNamespaceOrType (name, arity, mode, loc);
2284                                 }
2285                         }
2286
2287                         // TODO MemberCache: How to cache arity stuff ?
2288                         if (arity == 0 && mode == LookupMode.Normal)
2289                                 Cache[name] = e;
2290
2291                         return e;
2292                 }
2293
2294                 TypeSpec LookupNestedTypeInHierarchy (string name, int arity)
2295                 {
2296                         // Has any nested type
2297                         // Does not work, because base type can have
2298                         //if (PartialContainer.Types == null)
2299                         //      return null;
2300
2301                         var container = PartialContainer.CurrentType;
2302                         return MemberCache.FindNestedType (container, name, arity);
2303                 }
2304
2305                 public void Mark_HasEquals ()
2306                 {
2307                         cached_method |= CachedMethods.Equals;
2308                 }
2309
2310                 public void Mark_HasGetHashCode ()
2311                 {
2312                         cached_method |= CachedMethods.GetHashCode;
2313                 }
2314
2315                 public override void WriteDebugSymbol (MonoSymbolFile file)
2316                 {
2317                         if (IsPartialPart)
2318                                 return;
2319
2320                         foreach (var m in members) {
2321                                 m.WriteDebugSymbol (file);
2322                         }
2323                 }
2324
2325                 /// <summary>
2326                 /// Method container contains Equals method
2327                 /// </summary>
2328                 public bool HasEquals {
2329                         get {
2330                                 return (cached_method & CachedMethods.Equals) != 0;
2331                         }
2332                 }
2333
2334                 /// <summary>
2335                 /// Method container contains GetHashCode method
2336                 /// </summary>
2337                 public bool HasGetHashCode {
2338                         get {
2339                                 return (cached_method & CachedMethods.GetHashCode) != 0;
2340                         }
2341                 }
2342
2343                 public bool HasStaticFieldInitializer {
2344                         get {
2345                                 return (cached_method & CachedMethods.HasStaticFieldInitializer) != 0;
2346                         }
2347                         set {
2348                                 if (value)
2349                                         cached_method |= CachedMethods.HasStaticFieldInitializer;
2350                                 else
2351                                         cached_method &= ~CachedMethods.HasStaticFieldInitializer;
2352                         }
2353                 }
2354
2355                 public override string DocCommentHeader {
2356                         get { return "T:"; }
2357                 }
2358         }
2359
2360         public abstract class ClassOrStruct : TypeDefinition
2361         {
2362                 public const TypeAttributes StaticClassAttribute = TypeAttributes.Abstract | TypeAttributes.Sealed;
2363
2364                 SecurityType declarative_security;
2365
2366                 public ClassOrStruct (TypeContainer parent, MemberName name, Attributes attrs, MemberKind kind)
2367                         : base (parent, name, attrs, kind)
2368                 {
2369                 }
2370
2371                 protected override TypeAttributes TypeAttr {
2372                         get {
2373                                 TypeAttributes ta = base.TypeAttr;
2374                                 if (!has_static_constructor)
2375                                         ta |= TypeAttributes.BeforeFieldInit;
2376
2377                                 if (Kind == MemberKind.Class) {
2378                                         ta |= TypeAttributes.AutoLayout | TypeAttributes.Class;
2379                                         if (IsStatic)
2380                                                 ta |= StaticClassAttribute;
2381                                 } else {
2382                                         ta |= TypeAttributes.SequentialLayout;
2383                                 }
2384
2385                                 return ta;
2386                         }
2387                 }
2388
2389                 public override void AddNameToContainer (MemberCore symbol, string name)
2390                 {
2391                         if (!(symbol is Constructor) && symbol.MemberName.Name == MemberName.Name) {
2392                                 if (symbol is TypeParameter) {
2393                                         Report.Error (694, symbol.Location,
2394                                                 "Type parameter `{0}' has same name as containing type, or method",
2395                                                 symbol.GetSignatureForError ());
2396                                         return;
2397                                 }
2398
2399                                 InterfaceMemberBase imb = symbol as InterfaceMemberBase;
2400                                 if (imb == null || !imb.IsExplicitImpl) {
2401                                         Report.SymbolRelatedToPreviousError (this);
2402                                         Report.Error (542, symbol.Location, "`{0}': member names cannot be the same as their enclosing type",
2403                                                 symbol.GetSignatureForError ());
2404                                         return;
2405                                 }
2406                         }
2407
2408                         base.AddNameToContainer (symbol, name);
2409                 }
2410
2411                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2412                 {
2413                         if (a.IsValidSecurityAttribute ()) {
2414                                 a.ExtractSecurityPermissionSet (ctor, ref declarative_security);
2415                                 return;
2416                         }
2417
2418                         if (a.Type == pa.StructLayout) {
2419                                 PartialContainer.HasStructLayout = true;
2420                                 if (a.IsExplicitLayoutKind ())
2421                                         PartialContainer.HasExplicitLayout = true;
2422                         }
2423
2424                         if (a.Type == pa.Dynamic) {
2425                                 a.Error_MisusedDynamicAttribute ();
2426                                 return;
2427                         }
2428
2429                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2430                 }
2431
2432                 /// <summary>
2433                 /// Defines the default constructors
2434                 /// </summary>
2435                 protected Constructor DefineDefaultConstructor (bool is_static)
2436                 {
2437                         // The default instance constructor is public
2438                         // If the class is abstract, the default constructor is protected
2439                         // The default static constructor is private
2440
2441                         Modifiers mods;
2442                         if (is_static) {
2443                                 mods = Modifiers.STATIC | Modifiers.PRIVATE;
2444                         } else {
2445                                 mods = ((ModFlags & Modifiers.ABSTRACT) != 0) ? Modifiers.PROTECTED : Modifiers.PUBLIC;
2446                         }
2447
2448                         var c = new Constructor (this, MemberName.Name, mods, null, ParametersCompiled.EmptyReadOnlyParameters, Location);
2449                         c.Initializer = new GeneratedBaseInitializer (Location);
2450
2451                         AddConstructor (c, true);
2452                         c.Block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location) {
2453                                 IsCompilerGenerated = true
2454                         };
2455
2456                         return c;
2457                 }
2458
2459                 protected override bool DoDefineMembers ()
2460                 {
2461                         CheckProtectedModifier ();
2462
2463                         base.DoDefineMembers ();
2464
2465                         return true;
2466                 }
2467
2468                 public override void Emit ()
2469                 {
2470                         if (!has_static_constructor && HasStaticFieldInitializer) {
2471                                 var c = DefineDefaultConstructor (true);
2472                                 c.Define ();
2473                         }
2474
2475                         base.Emit ();
2476
2477                         if (declarative_security != null) {
2478                                 foreach (var de in declarative_security) {
2479 #if STATIC
2480                                         TypeBuilder.__AddDeclarativeSecurity (de);
2481 #else
2482                                         TypeBuilder.AddDeclarativeSecurity (de.Key, de.Value);
2483 #endif
2484                                 }
2485                         }
2486                 }
2487         }
2488
2489
2490         public sealed class Class : ClassOrStruct
2491         {
2492                 const Modifiers AllowedModifiers =
2493                         Modifiers.NEW |
2494                         Modifiers.PUBLIC |
2495                         Modifiers.PROTECTED |
2496                         Modifiers.INTERNAL |
2497                         Modifiers.PRIVATE |
2498                         Modifiers.ABSTRACT |
2499                         Modifiers.SEALED |
2500                         Modifiers.STATIC |
2501                         Modifiers.UNSAFE;
2502
2503                 public Class (TypeContainer parent, MemberName name, Modifiers mod, Attributes attrs)
2504                         : base (parent, name, attrs, MemberKind.Class)
2505                 {
2506                         var accmods = IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2507                         this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, Location, Report);
2508                         spec = new TypeSpec (Kind, null, this, null, ModFlags);
2509                 }
2510
2511                 public override void Accept (StructuralVisitor visitor)
2512                 {
2513                         visitor.Visit (this);
2514                 }
2515
2516                 public override void AddBasesForPart (List<FullNamedExpression> bases)
2517                 {
2518                         var pmn = MemberName;
2519                         if (pmn.Name == "Object" && !pmn.IsGeneric && Parent.MemberName.Name == "System" && Parent.MemberName.Left == null)
2520                                 Report.Error (537, Location,
2521                                         "The class System.Object cannot have a base class or implement an interface.");
2522
2523                         base.AddBasesForPart (bases);
2524                 }
2525
2526                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2527                 {
2528                         if (a.Type == pa.AttributeUsage) {
2529                                 if (!BaseType.IsAttribute && spec.BuiltinType != BuiltinTypeSpec.Type.Attribute) {
2530                                         Report.Error (641, a.Location, "Attribute `{0}' is only valid on classes derived from System.Attribute", a.GetSignatureForError ());
2531                                 }
2532                         }
2533
2534                         if (a.Type == pa.Conditional && !BaseType.IsAttribute) {
2535                                 Report.Error (1689, a.Location, "Attribute `System.Diagnostics.ConditionalAttribute' is only valid on methods or attribute classes");
2536                                 return;
2537                         }
2538
2539                         if (a.Type == pa.ComImport && !attributes.Contains (pa.Guid)) {
2540                                 a.Error_MissingGuidAttribute ();
2541                                 return;
2542                         }
2543
2544                         if (a.Type == pa.Extension) {
2545                                 a.Error_MisusedExtensionAttribute ();
2546                                 return;
2547                         }
2548
2549                         if (a.Type.IsConditionallyExcluded (this, Location))
2550                                 return;
2551
2552                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2553                 }
2554
2555                 public override AttributeTargets AttributeTargets {
2556                         get {
2557                                 return AttributeTargets.Class;
2558                         }
2559                 }
2560
2561                 protected override bool DoDefineMembers ()
2562                 {
2563                         if ((ModFlags & Modifiers.ABSTRACT) == Modifiers.ABSTRACT && (ModFlags & (Modifiers.SEALED | Modifiers.STATIC)) != 0) {
2564                                 Report.Error (418, Location, "`{0}': an abstract class cannot be sealed or static", GetSignatureForError ());
2565                         }
2566
2567                         if ((ModFlags & (Modifiers.SEALED | Modifiers.STATIC)) == (Modifiers.SEALED | Modifiers.STATIC)) {
2568                                 Report.Error (441, Location, "`{0}': a class cannot be both static and sealed", GetSignatureForError ());
2569                         }
2570
2571                         if (IsStatic) {
2572                                 foreach (var m in Members) {
2573                                         if (m is Operator) {
2574                                                 Report.Error (715, m.Location, "`{0}': Static classes cannot contain user-defined operators", m.GetSignatureForError ());
2575                                                 continue;
2576                                         }
2577
2578                                         if (m is Destructor) {
2579                                                 Report.Error (711, m.Location, "`{0}': Static classes cannot contain destructor", GetSignatureForError ());
2580                                                 continue;
2581                                         }
2582
2583                                         if (m is Indexer) {
2584                                                 Report.Error (720, m.Location, "`{0}': cannot declare indexers in a static class", m.GetSignatureForError ());
2585                                                 continue;
2586                                         }
2587
2588                                         if ((m.ModFlags & Modifiers.STATIC) != 0 || m is TypeContainer)
2589                                                 continue;
2590
2591                                         if (m is Constructor) {
2592                                                 Report.Error (710, m.Location, "`{0}': Static classes cannot have instance constructors", GetSignatureForError ());
2593                                                 continue;
2594                                         }
2595
2596                                         Report.Error (708, m.Location, "`{0}': cannot declare instance members in a static class", m.GetSignatureForError ());
2597                                 }
2598                         } else {
2599                                 if (!PartialContainer.HasInstanceConstructor)
2600                                         DefineDefaultConstructor (false);
2601                         }
2602
2603                         return base.DoDefineMembers ();
2604                 }
2605
2606                 public override void Emit ()
2607                 {
2608                         base.Emit ();
2609
2610                         if ((ModFlags & Modifiers.METHOD_EXTENSION) != 0)
2611                                 Module.PredefinedAttributes.Extension.EmitAttribute (TypeBuilder);
2612
2613                         if (base_type != null && base_type.HasDynamicElement) {
2614                                 Module.PredefinedAttributes.Dynamic.EmitAttribute (TypeBuilder, base_type, Location);
2615                         }
2616                 }
2617
2618                 protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
2619                 {
2620                         var ifaces = base.ResolveBaseTypes (out base_class);
2621
2622                         if (base_class == null) {
2623                                 if (spec.BuiltinType != BuiltinTypeSpec.Type.Object)
2624                                         base_type = Compiler.BuiltinTypes.Object;
2625                         } else {
2626                                 if (base_type.IsGenericParameter){
2627                                         Report.Error (689, base_class.Location, "`{0}': Cannot derive from type parameter `{1}'",
2628                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2629                                 } else if (base_type.IsStatic) {
2630                                         Report.SymbolRelatedToPreviousError (base_type);
2631                                         Report.Error (709, Location, "`{0}': Cannot derive from static class `{1}'",
2632                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2633                                 } else if (base_type.IsSealed) {
2634                                         Report.SymbolRelatedToPreviousError (base_type);
2635                                         Report.Error (509, Location, "`{0}': cannot derive from sealed type `{1}'",
2636                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2637                                 } else if (PartialContainer.IsStatic && base_type.BuiltinType != BuiltinTypeSpec.Type.Object) {
2638                                         Report.Error (713, Location, "Static class `{0}' cannot derive from type `{1}'. Static classes must derive from object",
2639                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2640                                 }
2641
2642                                 switch (base_type.BuiltinType) {
2643                                 case BuiltinTypeSpec.Type.Enum:
2644                                 case BuiltinTypeSpec.Type.ValueType:
2645                                 case BuiltinTypeSpec.Type.MulticastDelegate:
2646                                 case BuiltinTypeSpec.Type.Delegate:
2647                                 case BuiltinTypeSpec.Type.Array:
2648                                         if (!(spec is BuiltinTypeSpec)) {
2649                                                 Report.Error (644, Location, "`{0}' cannot derive from special class `{1}'",
2650                                                         GetSignatureForError (), base_type.GetSignatureForError ());
2651
2652                                                 base_type = Compiler.BuiltinTypes.Object;
2653                                         }
2654                                         break;
2655                                 }
2656
2657                                 if (!IsAccessibleAs (base_type)) {
2658                                         Report.SymbolRelatedToPreviousError (base_type);
2659                                         Report.Error (60, Location, "Inconsistent accessibility: base class `{0}' is less accessible than class `{1}'",
2660                                                 base_type.GetSignatureForError (), GetSignatureForError ());
2661                                 }
2662                         }
2663
2664                         if (PartialContainer.IsStatic && ifaces != null) {
2665                                 foreach (var t in ifaces)
2666                                         Report.SymbolRelatedToPreviousError (t);
2667                                 Report.Error (714, Location, "Static class `{0}' cannot implement interfaces", GetSignatureForError ());
2668                         }
2669
2670                         return ifaces;
2671                 }
2672
2673                 /// Search for at least one defined condition in ConditionalAttribute of attribute class
2674                 /// Valid only for attribute classes.
2675                 public override string[] ConditionalConditions ()
2676                 {
2677                         if ((caching_flags & (Flags.Excluded_Undetected | Flags.Excluded)) == 0)
2678                                 return null;
2679
2680                         caching_flags &= ~Flags.Excluded_Undetected;
2681
2682                         if (OptAttributes == null)
2683                                 return null;
2684
2685                         Attribute[] attrs = OptAttributes.SearchMulti (Module.PredefinedAttributes.Conditional);
2686                         if (attrs == null)
2687                                 return null;
2688
2689                         string[] conditions = new string[attrs.Length];
2690                         for (int i = 0; i < conditions.Length; ++i)
2691                                 conditions[i] = attrs[i].GetConditionalAttributeValue ();
2692
2693                         caching_flags |= Flags.Excluded;
2694                         return conditions;
2695                 }
2696         }
2697
2698         public sealed class Struct : ClassOrStruct
2699         {
2700                 bool is_unmanaged, has_unmanaged_check_done;
2701                 bool InTransit;
2702
2703                 // <summary>
2704                 //   Modifiers allowed in a struct declaration
2705                 // </summary>
2706                 const Modifiers AllowedModifiers =
2707                         Modifiers.NEW       |
2708                         Modifiers.PUBLIC    |
2709                         Modifiers.PROTECTED |
2710                         Modifiers.INTERNAL  |
2711                         Modifiers.UNSAFE    |
2712                         Modifiers.PRIVATE;
2713
2714                 public Struct (TypeContainer parent, MemberName name, Modifiers mod, Attributes attrs)
2715                         : base (parent, name, attrs, MemberKind.Struct)
2716                 {
2717                         var accmods = IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2718                         this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, Location, Report) | Modifiers.SEALED ;
2719                         spec = new TypeSpec (Kind, null, this, null, ModFlags);
2720                 }
2721
2722                 public override AttributeTargets AttributeTargets {
2723                         get {
2724                                 return AttributeTargets.Struct;
2725                         }
2726                 }
2727
2728                 public override void Accept (StructuralVisitor visitor)
2729                 {
2730                         visitor.Visit (this);
2731                 }
2732
2733                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2734                 {
2735                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2736
2737                         //
2738                         // When struct constains fixed fixed and struct layout has explicitly
2739                         // set CharSet, its value has to be propagated to compiler generated
2740                         // fixed types
2741                         //
2742                         if (a.Type == pa.StructLayout) {
2743                                 var value = a.GetNamedValue ("CharSet");
2744                                 if (value == null)
2745                                         return;
2746
2747                                 for (int i = 0; i < Members.Count; ++i) {
2748                                         FixedField ff = Members [i] as FixedField;
2749                                         if (ff == null)
2750                                                 continue;
2751
2752                                         ff.CharSet = (CharSet) System.Enum.Parse (typeof (CharSet), value.GetValue ().ToString ());
2753                                 }
2754                         }
2755                 }
2756
2757                 bool CheckStructCycles ()
2758                 {
2759                         if (InTransit)
2760                                 return false;
2761
2762                         InTransit = true;
2763                         foreach (var member in Members) {
2764                                 var field = member as Field;
2765                                 if (field == null)
2766                                         continue;
2767
2768                                 TypeSpec ftype = field.Spec.MemberType;
2769                                 if (!ftype.IsStruct)
2770                                         continue;
2771
2772                                 if (ftype is BuiltinTypeSpec)
2773                                         continue;
2774
2775                                 foreach (var targ in ftype.TypeArguments) {
2776                                         if (!CheckFieldTypeCycle (targ)) {
2777                                                 Report.Error (523, field.Location,
2778                                                         "Struct member `{0}' of type `{1}' causes a cycle in the struct layout",
2779                                                         field.GetSignatureForError (), ftype.GetSignatureForError ());
2780                                                 break;
2781                                         }
2782                                 }
2783
2784                                 //
2785                                 // Static fields of exactly same type are allowed
2786                                 //
2787                                 if (field.IsStatic && ftype == CurrentType)
2788                                         continue;
2789
2790                                 if (!CheckFieldTypeCycle (ftype)) {
2791                                         Report.Error (523, field.Location,
2792                                                 "Struct member `{0}' of type `{1}' causes a cycle in the struct layout",
2793                                                 field.GetSignatureForError (), ftype.GetSignatureForError ());
2794                                         break;
2795                                 }
2796                         }
2797
2798                         InTransit = false;
2799                         return true;
2800                 }
2801
2802                 static bool CheckFieldTypeCycle (TypeSpec ts)
2803                 {
2804                         var fts = ts.MemberDefinition as Struct;
2805                         if (fts == null)
2806                                 return true;
2807
2808                         return fts.CheckStructCycles ();
2809                 }
2810
2811                 public override void Emit ()
2812                 {
2813                         CheckStructCycles ();
2814
2815                         base.Emit ();
2816                 }
2817
2818                 public override bool IsUnmanagedType ()
2819                 {
2820                         if (has_unmanaged_check_done)
2821                                 return is_unmanaged;
2822
2823                         if (requires_delayed_unmanagedtype_check)
2824                                 return true;
2825
2826                         var parent_def = Parent.PartialContainer;
2827                         if (parent_def != null && parent_def.IsGenericOrParentIsGeneric) {
2828                                 has_unmanaged_check_done = true;
2829                                 return false;
2830                         }
2831
2832                         if (first_nonstatic_field != null) {
2833                                 requires_delayed_unmanagedtype_check = true;
2834
2835                                 foreach (var member in Members) {
2836                                         var f = member as Field;
2837                                         if (f == null)
2838                                                 continue;
2839
2840                                         if (f.IsStatic)
2841                                                 continue;
2842
2843                                         // It can happen when recursive unmanaged types are defined
2844                                         // struct S { S* s; }
2845                                         TypeSpec mt = f.MemberType;
2846                                         if (mt == null) {
2847                                                 return true;
2848                                         }
2849
2850                                         if (mt.IsUnmanaged)
2851                                                 continue;
2852
2853                                         has_unmanaged_check_done = true;
2854                                         return false;
2855                                 }
2856
2857                                 has_unmanaged_check_done = true;
2858                         }
2859
2860                         is_unmanaged = true;
2861                         return true;
2862                 }
2863
2864                 protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
2865                 {
2866                         var ifaces = base.ResolveBaseTypes (out base_class);
2867                         base_type = Compiler.BuiltinTypes.ValueType;
2868                         return ifaces;
2869                 }
2870
2871                 public override void RegisterFieldForInitialization (MemberCore field, FieldInitializer expression)
2872                 {
2873                         if ((field.ModFlags & Modifiers.STATIC) == 0) {
2874                                 Report.Error (573, field.Location, "`{0}': Structs cannot have instance field initializers",
2875                                         field.GetSignatureForError ());
2876                                 return;
2877                         }
2878                         base.RegisterFieldForInitialization (field, expression);
2879                 }
2880
2881         }
2882
2883         /// <summary>
2884         ///   Interfaces
2885         /// </summary>
2886         public sealed class Interface : TypeDefinition {
2887
2888                 /// <summary>
2889                 ///   Modifiers allowed in a class declaration
2890                 /// </summary>
2891                 const Modifiers AllowedModifiers =
2892                         Modifiers.NEW       |
2893                         Modifiers.PUBLIC    |
2894                         Modifiers.PROTECTED |
2895                         Modifiers.INTERNAL  |
2896                         Modifiers.UNSAFE    |
2897                         Modifiers.PRIVATE;
2898
2899                 public Interface (TypeContainer parent, MemberName name, Modifiers mod, Attributes attrs)
2900                         : base (parent, name, attrs, MemberKind.Interface)
2901                 {
2902                         var accmods = IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2903
2904                         this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, name.Location, Report);
2905                         spec = new TypeSpec (Kind, null, this, null, ModFlags);
2906                 }
2907
2908                 #region Properties
2909
2910                 public override AttributeTargets AttributeTargets {
2911                         get {
2912                                 return AttributeTargets.Interface;
2913                         }
2914                 }
2915
2916                 protected override TypeAttributes TypeAttr {
2917                         get {
2918                                 const TypeAttributes DefaultTypeAttributes =
2919                                         TypeAttributes.AutoLayout |
2920                                         TypeAttributes.Abstract |
2921                                         TypeAttributes.Interface;
2922
2923                                 return base.TypeAttr | DefaultTypeAttributes;
2924                         }
2925                 }
2926
2927                 #endregion
2928
2929                 public override void Accept (StructuralVisitor visitor)
2930                 {
2931                         visitor.Visit (this);
2932                 }
2933
2934                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2935                 {
2936                         if (a.Type == pa.ComImport && !attributes.Contains (pa.Guid)) {
2937                                 a.Error_MissingGuidAttribute ();
2938                                 return;
2939                         }
2940
2941                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2942                 }
2943
2944                 protected override bool VerifyClsCompliance ()
2945                 {
2946                         if (!base.VerifyClsCompliance ())
2947                                 return false;
2948
2949                         if (iface_exprs != null) {
2950                                 foreach (var iface in iface_exprs) {
2951                                         if (iface.IsCLSCompliant ())
2952                                                 continue;
2953
2954                                         Report.SymbolRelatedToPreviousError (iface);
2955                                         Report.Warning (3027, 1, Location, "`{0}' is not CLS-compliant because base interface `{1}' is not CLS-compliant",
2956                                                 GetSignatureForError (), TypeManager.CSharpName (iface));
2957                                 }
2958                         }
2959
2960                         return true;
2961                 }
2962         }
2963
2964         public abstract class InterfaceMemberBase : MemberBase
2965         {
2966                 //
2967                 // Common modifiers allowed in a class declaration
2968                 //
2969                 protected const Modifiers AllowedModifiersClass =
2970                         Modifiers.NEW |
2971                         Modifiers.PUBLIC |
2972                         Modifiers.PROTECTED |
2973                         Modifiers.INTERNAL |
2974                         Modifiers.PRIVATE |
2975                         Modifiers.STATIC |
2976                         Modifiers.VIRTUAL |
2977                         Modifiers.SEALED |
2978                         Modifiers.OVERRIDE |
2979                         Modifiers.ABSTRACT |
2980                         Modifiers.UNSAFE |
2981                         Modifiers.EXTERN;
2982
2983                 //
2984                 // Common modifiers allowed in a struct declaration
2985                 //
2986                 protected const Modifiers AllowedModifiersStruct =
2987                         Modifiers.NEW |
2988                         Modifiers.PUBLIC |
2989                         Modifiers.PROTECTED |
2990                         Modifiers.INTERNAL |
2991                         Modifiers.PRIVATE |
2992                         Modifiers.STATIC |
2993                         Modifiers.OVERRIDE |
2994                         Modifiers.UNSAFE |
2995                         Modifiers.EXTERN;
2996
2997                 //
2998                 // Common modifiers allowed in a interface declaration
2999                 //
3000                 protected const Modifiers AllowedModifiersInterface =
3001                         Modifiers.NEW |
3002                         Modifiers.UNSAFE;
3003
3004                 //
3005                 // Whether this is an interface member.
3006                 //
3007                 public bool IsInterface;
3008
3009                 //
3010                 // If true, this is an explicit interface implementation
3011                 //
3012                 public readonly bool IsExplicitImpl;
3013
3014                 protected bool is_external_implementation;
3015
3016                 //
3017                 // The interface type we are explicitly implementing
3018                 //
3019                 public TypeSpec InterfaceType;
3020
3021                 //
3022                 // The method we're overriding if this is an override method.
3023                 //
3024                 protected MethodSpec base_method;
3025
3026                 readonly Modifiers explicit_mod_flags;
3027                 public MethodAttributes flags;
3028
3029                 public InterfaceMemberBase (TypeDefinition parent, FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, MemberName name, Attributes attrs)
3030                         : base (parent, type, mod, allowed_mod, Modifiers.PRIVATE, name, attrs)
3031                 {
3032                         IsInterface = parent.Kind == MemberKind.Interface;
3033                         IsExplicitImpl = (MemberName.ExplicitInterface != null);
3034                         explicit_mod_flags = mod;
3035                 }
3036
3037                 public abstract Variance ExpectedMemberTypeVariance { get; }
3038
3039                 protected override bool CheckBase ()
3040                 {
3041                         if (!base.CheckBase ())
3042                                 return false;
3043
3044                         if ((caching_flags & Flags.MethodOverloadsExist) != 0)
3045                                 CheckForDuplications ();
3046
3047                         if (IsExplicitImpl)
3048                                 return true;
3049
3050                         // For System.Object only
3051                         if (Parent.BaseType == null)
3052                                 return true;
3053
3054                         MemberSpec candidate;
3055                         bool overrides = false;
3056                         var base_member = FindBaseMember (out candidate, ref overrides);
3057
3058                         if ((ModFlags & Modifiers.OVERRIDE) != 0) {
3059                                 if (base_member == null) {
3060                                         if (candidate == null) {
3061                                                 if (this is Method && ((Method)this).ParameterInfo.IsEmpty && MemberName.Name == Destructor.MetadataName && MemberName.Arity == 0) {
3062                                                         Report.Error (249, Location, "Do not override `{0}'. Use destructor syntax instead",
3063                                                                 "object.Finalize()");
3064                                                 } else {
3065                                                         Report.Error (115, Location, "`{0}' is marked as an override but no suitable {1} found to override",
3066                                                                 GetSignatureForError (), SimpleName.GetMemberType (this));
3067                                                 }
3068                                         } else {
3069                                                 Report.SymbolRelatedToPreviousError (candidate);
3070                                                 if (this is Event)
3071                                                         Report.Error (72, Location, "`{0}': cannot override because `{1}' is not an event",
3072                                                                 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
3073                                                 else if (this is PropertyBase)
3074                                                         Report.Error (544, Location, "`{0}': cannot override because `{1}' is not a property",
3075                                                                 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
3076                                                 else
3077                                                         Report.Error (505, Location, "`{0}': cannot override because `{1}' is not a method",
3078                                                                 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
3079                                         }
3080
3081                                         return false;
3082                                 }
3083
3084                                 //
3085                                 // Handles ambiguous overrides
3086                                 //
3087                                 if (candidate != null) {
3088                                         Report.SymbolRelatedToPreviousError (candidate);
3089                                         Report.SymbolRelatedToPreviousError (base_member);
3090
3091                                         // Get member definition for error reporting
3092                                         var m1 = MemberCache.GetMember (base_member.DeclaringType.GetDefinition (), base_member);
3093                                         var m2 = MemberCache.GetMember (candidate.DeclaringType.GetDefinition (), candidate);
3094
3095                                         Report.Error (462, Location,
3096                                                 "`{0}' cannot override inherited members `{1}' and `{2}' because they have the same signature when used in type `{3}'",
3097                                                 GetSignatureForError (), m1.GetSignatureForError (), m2.GetSignatureForError (), Parent.GetSignatureForError ());
3098                                 }
3099
3100                                 if (!CheckOverrideAgainstBase (base_member))
3101                                         return false;
3102
3103                                 ObsoleteAttribute oa = base_member.GetAttributeObsolete ();
3104                                 if (oa != null) {
3105                                         if (OptAttributes == null || !OptAttributes.Contains (Module.PredefinedAttributes.Obsolete)) {
3106                                                 Report.SymbolRelatedToPreviousError (base_member);
3107                                                 Report.Warning (672, 1, Location, "Member `{0}' overrides obsolete member `{1}'. Add the Obsolete attribute to `{0}'",
3108                                                         GetSignatureForError (), base_member.GetSignatureForError ());
3109                                         }
3110                                 } else {
3111                                         if (OptAttributes != null && OptAttributes.Contains (Module.PredefinedAttributes.Obsolete)) {
3112                                                 Report.SymbolRelatedToPreviousError (base_member);
3113                                                 Report.Warning (809, 1, Location, "Obsolete member `{0}' overrides non-obsolete member `{1}'",
3114                                                         GetSignatureForError (), base_member.GetSignatureForError ());
3115                                         }
3116                                 }
3117
3118                                 base_method = base_member as MethodSpec;
3119                                 return true;
3120                         }
3121
3122                         if (base_member == null && candidate != null && (!(candidate is IParametersMember) || !(this is IParametersMember)))
3123                                 base_member = candidate;
3124
3125                         if (base_member == null) {
3126                                 if ((ModFlags & Modifiers.NEW) != 0) {
3127                                         if (base_member == null) {
3128                                                 Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required",
3129                                                         GetSignatureForError ());
3130                                         }
3131                                 }
3132                         } else {
3133                                 if ((ModFlags & Modifiers.NEW) == 0) {
3134                                         ModFlags |= Modifiers.NEW;
3135                                         if (!IsCompilerGenerated) {
3136                                                 Report.SymbolRelatedToPreviousError (base_member);
3137                                                 if (!IsInterface && (base_member.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE)) != 0) {
3138                                                         Report.Warning (114, 2, Location, "`{0}' hides inherited member `{1}'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword",
3139                                                                 GetSignatureForError (), base_member.GetSignatureForError ());
3140                                                 } else {
3141                                                         Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended",
3142                                                                 GetSignatureForError (), base_member.GetSignatureForError ());
3143                                                 }
3144                                         }
3145                                 }
3146
3147                                 if (!IsInterface && base_member.IsAbstract && !overrides) {
3148                                         Report.SymbolRelatedToPreviousError (base_member);
3149                                         Report.Error (533, Location, "`{0}' hides inherited abstract member `{1}'",
3150                                                 GetSignatureForError (), base_member.GetSignatureForError ());
3151                                 }
3152                         }
3153
3154                         return true;
3155                 }
3156
3157                 protected virtual bool CheckForDuplications ()
3158                 {
3159                         return Parent.MemberCache.CheckExistingMembersOverloads (this, ParametersCompiled.EmptyReadOnlyParameters);
3160                 }
3161
3162                 //
3163                 // Performs various checks on the MethodInfo `mb' regarding the modifier flags
3164                 // that have been defined.
3165                 //
3166                 protected virtual bool CheckOverrideAgainstBase (MemberSpec base_member)
3167                 {
3168                         bool ok = true;
3169
3170                         if ((base_member.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE)) == 0) {
3171                                 Report.SymbolRelatedToPreviousError (base_member);
3172                                 Report.Error (506, Location,
3173                                         "`{0}': cannot override inherited member `{1}' because it is not marked virtual, abstract or override",
3174                                          GetSignatureForError (), TypeManager.CSharpSignature (base_member));
3175                                 ok = false;
3176                         }
3177
3178                         // Now we check that the overriden method is not final
3179                         if ((base_member.Modifiers & Modifiers.SEALED) != 0) {
3180                                 Report.SymbolRelatedToPreviousError (base_member);
3181                                 Report.Error (239, Location, "`{0}': cannot override inherited member `{1}' because it is sealed",
3182                                                           GetSignatureForError (), TypeManager.CSharpSignature (base_member));
3183                                 ok = false;
3184                         }
3185
3186                         var base_member_type = ((IInterfaceMemberSpec) base_member).MemberType;
3187                         if (!TypeSpecComparer.Override.IsEqual (MemberType, base_member_type)) {
3188                                 Report.SymbolRelatedToPreviousError (base_member);
3189                                 if (this is PropertyBasedMember) {
3190                                         Report.Error (1715, Location, "`{0}': type must be `{1}' to match overridden member `{2}'",
3191                                                 GetSignatureForError (), TypeManager.CSharpName (base_member_type), TypeManager.CSharpSignature (base_member));
3192                                 } else {
3193                                         Report.Error (508, Location, "`{0}': return type must be `{1}' to match overridden member `{2}'",
3194                                                 GetSignatureForError (), TypeManager.CSharpName (base_member_type), TypeManager.CSharpSignature (base_member));
3195                                 }
3196                                 ok = false;
3197                         }
3198
3199                         return ok;
3200                 }
3201
3202                 protected static bool CheckAccessModifiers (MemberCore this_member, MemberSpec base_member)
3203                 {
3204                         var thisp = this_member.ModFlags & Modifiers.AccessibilityMask;
3205                         var base_classp = base_member.Modifiers & Modifiers.AccessibilityMask;
3206
3207                         if ((base_classp & (Modifiers.PROTECTED | Modifiers.INTERNAL)) == (Modifiers.PROTECTED | Modifiers.INTERNAL)) {
3208                                 //
3209                                 // It must be at least "protected"
3210                                 //
3211                                 if ((thisp & Modifiers.PROTECTED) == 0) {
3212                                         return false;
3213                                 }
3214
3215                                 //
3216                                 // when overriding protected internal, the method can be declared
3217                                 // protected internal only within the same assembly or assembly
3218                                 // which has InternalsVisibleTo
3219                                 //
3220                                 if ((thisp & Modifiers.INTERNAL) != 0) {
3221                                         return base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (this_member.Module.DeclaringAssembly);
3222                                 }
3223
3224                                 //
3225                                 // protected overriding protected internal inside same assembly
3226                                 // requires internal modifier as well
3227                                 //
3228                                 if (base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (this_member.Module.DeclaringAssembly)) {
3229                                         return false;
3230                                 }
3231
3232                                 return true;
3233                         }
3234
3235                         return thisp == base_classp;
3236                 }
3237
3238                 public override bool Define ()
3239                 {
3240                         if (IsInterface) {
3241                                 ModFlags = Modifiers.PUBLIC | Modifiers.ABSTRACT |
3242                                         Modifiers.VIRTUAL | (ModFlags & (Modifiers.UNSAFE | Modifiers.NEW));
3243
3244                                 flags = MethodAttributes.Public |
3245                                         MethodAttributes.Abstract |
3246                                         MethodAttributes.HideBySig |
3247                                         MethodAttributes.NewSlot |
3248                                         MethodAttributes.Virtual;
3249                         } else {
3250                                 Parent.PartialContainer.MethodModifiersValid (this);
3251
3252                                 flags = ModifiersExtensions.MethodAttr (ModFlags);
3253                         }
3254
3255                         if (IsExplicitImpl) {
3256                                 InterfaceType = MemberName.ExplicitInterface.ResolveAsType (Parent);
3257                                 if (InterfaceType == null)
3258                                         return false;
3259
3260                                 if ((ModFlags & Modifiers.PARTIAL) != 0) {
3261                                         Report.Error (754, Location, "A partial method `{0}' cannot explicitly implement an interface",
3262                                                 GetSignatureForError ());
3263                                 }
3264
3265                                 if (!InterfaceType.IsInterface) {
3266                                         Report.SymbolRelatedToPreviousError (InterfaceType);
3267                                         Report.Error (538, Location, "The type `{0}' in explicit interface declaration is not an interface",
3268                                                 TypeManager.CSharpName (InterfaceType));
3269                                 } else {
3270                                         Parent.PartialContainer.VerifyImplements (this);
3271                                 }
3272
3273                                 ModifiersExtensions.Check (Modifiers.AllowedExplicitImplFlags, explicit_mod_flags, 0, Location, Report);
3274                         }
3275
3276                         return base.Define ();
3277                 }
3278
3279                 protected bool DefineParameters (ParametersCompiled parameters)
3280                 {
3281                         if (!parameters.Resolve (this))
3282                                 return false;
3283
3284                         bool error = false;
3285                         for (int i = 0; i < parameters.Count; ++i) {
3286                                 Parameter p = parameters [i];
3287
3288                                 if (p.HasDefaultValue && (IsExplicitImpl || this is Operator || (this is Indexer && parameters.Count == 1)))
3289                                         p.Warning_UselessOptionalParameter (Report);
3290
3291                                 if (p.CheckAccessibility (this))
3292                                         continue;
3293
3294                                 TypeSpec t = parameters.Types [i];
3295                                 Report.SymbolRelatedToPreviousError (t);
3296                                 if (this is Indexer)
3297                                         Report.Error (55, Location,
3298                                                       "Inconsistent accessibility: parameter type `{0}' is less accessible than indexer `{1}'",
3299                                                       TypeManager.CSharpName (t), GetSignatureForError ());
3300                                 else if (this is Operator)
3301                                         Report.Error (57, Location,
3302                                                       "Inconsistent accessibility: parameter type `{0}' is less accessible than operator `{1}'",
3303                                                       TypeManager.CSharpName (t), GetSignatureForError ());
3304                                 else
3305                                         Report.Error (51, Location,
3306                                                 "Inconsistent accessibility: parameter type `{0}' is less accessible than method `{1}'",
3307                                                 TypeManager.CSharpName (t), GetSignatureForError ());
3308                                 error = true;
3309                         }
3310                         return !error;
3311                 }
3312
3313                 protected override void DoMemberTypeDependentChecks ()
3314                 {
3315                         base.DoMemberTypeDependentChecks ();
3316
3317                         TypeManager.CheckTypeVariance (MemberType, ExpectedMemberTypeVariance, this);
3318                 }
3319
3320                 public override void Emit()
3321                 {
3322                         // for extern static method must be specified either DllImport attribute or MethodImplAttribute.
3323                         // We are more strict than csc and report this as an error because SRE does not allow emit that
3324                         if ((ModFlags & Modifiers.EXTERN) != 0 && !is_external_implementation && (OptAttributes == null || !OptAttributes.HasResolveError ())) {
3325                                 if (this is Constructor) {
3326                                         Report.Warning (824, 1, Location,
3327                                                 "Constructor `{0}' is marked `external' but has no external implementation specified", GetSignatureForError ());
3328                                 } else {
3329                                         Report.Warning (626, 1, Location,
3330                                                 "`{0}' is marked as an external but has no DllImport attribute. Consider adding a DllImport attribute to specify the external implementation",
3331                                                 GetSignatureForError ());
3332                                 }
3333                         }
3334
3335                         base.Emit ();
3336                 }
3337
3338                 public override bool EnableOverloadChecks (MemberCore overload)
3339                 {
3340                         //
3341                         // Two members can differ in their explicit interface
3342                         // type parameter only
3343                         //
3344                         InterfaceMemberBase imb = overload as InterfaceMemberBase;
3345                         if (imb != null && imb.IsExplicitImpl) {
3346                                 if (IsExplicitImpl) {
3347                                         caching_flags |= Flags.MethodOverloadsExist;
3348                                 }
3349                                 return true;
3350                         }
3351
3352                         return IsExplicitImpl;
3353                 }
3354
3355                 protected void Error_CannotChangeAccessModifiers (MemberCore member, MemberSpec base_member)
3356                 {
3357                         var base_modifiers = base_member.Modifiers;
3358
3359                         // Remove internal modifier from types which are not internally accessible
3360                         if ((base_modifiers & Modifiers.AccessibilityMask) == (Modifiers.PROTECTED | Modifiers.INTERNAL) &&
3361                                 !base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (member.Module.DeclaringAssembly))
3362                                 base_modifiers = Modifiers.PROTECTED;
3363
3364                         Report.SymbolRelatedToPreviousError (base_member);
3365                         Report.Error (507, member.Location,
3366                                 "`{0}': cannot change access modifiers when overriding `{1}' inherited member `{2}'",
3367                                 member.GetSignatureForError (),
3368                                 ModifiersExtensions.AccessibilityName (base_modifiers),
3369                                 base_member.GetSignatureForError ());
3370                 }
3371
3372                 protected void Error_StaticReturnType ()
3373                 {
3374                         Report.Error (722, Location,
3375                                 "`{0}': static types cannot be used as return types",
3376                                 MemberType.GetSignatureForError ());
3377                 }
3378
3379                 /// <summary>
3380                 /// Gets base method and its return type
3381                 /// </summary>
3382                 protected virtual MemberSpec FindBaseMember (out MemberSpec bestCandidate, ref bool overrides)
3383                 {
3384                         return MemberCache.FindBaseMember (this, out bestCandidate, ref overrides);
3385                 }
3386
3387                 //
3388                 // The "short" name of this property / indexer / event.  This is the
3389                 // name without the explicit interface.
3390                 //
3391                 public string ShortName {
3392                         get { return MemberName.Name; }
3393                 }
3394
3395                 //
3396                 // Returns full metadata method name
3397                 //
3398                 public string GetFullName (MemberName name)
3399                 {
3400                         return GetFullName (name.Name);
3401                 }
3402
3403                 public string GetFullName (string name)
3404                 {
3405                         if (!IsExplicitImpl)
3406                                 return name;
3407
3408                         //
3409                         // When dealing with explicit members a full interface type
3410                         // name is added to member name to avoid possible name conflicts
3411                         //
3412                         // We use CSharpName which gets us full name with benefit of
3413                         // replacing predefined names which saves some space and name
3414                         // is still unique
3415                         //
3416                         return TypeManager.CSharpName (InterfaceType) + "." + name;
3417                 }
3418
3419                 public override string GetSignatureForDocumentation ()
3420                 {
3421                         if (IsExplicitImpl)
3422                                 return Parent.GetSignatureForDocumentation () + "." + InterfaceType.GetExplicitNameSignatureForDocumentation () + "#" + ShortName;
3423
3424                         return Parent.GetSignatureForDocumentation () + "." + ShortName;
3425                 }
3426
3427                 public override bool IsUsed
3428                 {
3429                         get { return IsExplicitImpl || base.IsUsed; }
3430                 }
3431
3432                 public override void SetConstraints (List<Constraints> constraints_list)
3433                 {
3434                         if (((ModFlags & Modifiers.OVERRIDE) != 0 || IsExplicitImpl)) {
3435                                 Report.Error (460, Location,
3436                                         "`{0}': Cannot specify constraints for overrides and explicit interface implementation methods",
3437                                         GetSignatureForError ());
3438                         }
3439
3440                         base.SetConstraints (constraints_list);
3441                 }
3442         }
3443
3444         public abstract class MemberBase : MemberCore
3445         {
3446                 protected FullNamedExpression type_expr;
3447                 protected TypeSpec member_type;
3448                 public new TypeDefinition Parent;
3449
3450                 protected MemberBase (TypeDefinition parent, FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, Modifiers def_mod, MemberName name, Attributes attrs)
3451                         : base (parent, name, attrs)
3452                 {
3453                         this.Parent = parent;
3454                         this.type_expr = type;
3455                         ModFlags = ModifiersExtensions.Check (allowed_mod, mod, def_mod, Location, Report);
3456                 }
3457
3458                 #region Properties
3459
3460                 public TypeSpec MemberType {
3461                         get {
3462                                 return member_type;
3463                         }
3464                 }
3465
3466                 public FullNamedExpression TypeExpression {
3467                         get {
3468                                 return type_expr;
3469                         }
3470                 }
3471
3472                 #endregion
3473
3474                 //
3475                 // Main member define entry
3476                 //
3477                 public override bool Define ()
3478                 {
3479                         DoMemberTypeIndependentChecks ();
3480
3481                         //
3482                         // Returns false only when type resolution failed
3483                         //
3484                         if (!ResolveMemberType ())
3485                                 return false;
3486
3487                         DoMemberTypeDependentChecks ();
3488                         return true;
3489                 }
3490
3491                 //
3492                 // Any type_name independent checks
3493                 //
3494                 protected virtual void DoMemberTypeIndependentChecks ()
3495                 {
3496                         if ((Parent.ModFlags & Modifiers.SEALED) != 0 &&
3497                                 (ModFlags & (Modifiers.VIRTUAL | Modifiers.ABSTRACT)) != 0) {
3498                                 Report.Error (549, Location, "New virtual member `{0}' is declared in a sealed class `{1}'",
3499                                         GetSignatureForError (), Parent.GetSignatureForError ());
3500                         }
3501                 }
3502
3503                 //
3504                 // Any type_name dependent checks
3505                 //
3506                 protected virtual void DoMemberTypeDependentChecks ()
3507                 {
3508                         // verify accessibility
3509                         if (!IsAccessibleAs (MemberType)) {
3510                                 Report.SymbolRelatedToPreviousError (MemberType);
3511                                 if (this is Property)
3512                                         Report.Error (53, Location,
3513                                                       "Inconsistent accessibility: property type `" +
3514                                                       TypeManager.CSharpName (MemberType) + "' is less " +
3515                                                       "accessible than property `" + GetSignatureForError () + "'");
3516                                 else if (this is Indexer)
3517                                         Report.Error (54, Location,
3518                                                       "Inconsistent accessibility: indexer return type `" +
3519                                                       TypeManager.CSharpName (MemberType) + "' is less " +
3520                                                       "accessible than indexer `" + GetSignatureForError () + "'");
3521                                 else if (this is MethodCore) {
3522                                         if (this is Operator)
3523                                                 Report.Error (56, Location,
3524                                                               "Inconsistent accessibility: return type `" +
3525                                                               TypeManager.CSharpName (MemberType) + "' is less " +
3526                                                               "accessible than operator `" + GetSignatureForError () + "'");
3527                                         else
3528                                                 Report.Error (50, Location,
3529                                                               "Inconsistent accessibility: return type `" +
3530                                                               TypeManager.CSharpName (MemberType) + "' is less " +
3531                                                               "accessible than method `" + GetSignatureForError () + "'");
3532                                 } else {
3533                                         Report.Error (52, Location,
3534                                                       "Inconsistent accessibility: field type `" +
3535                                                       TypeManager.CSharpName (MemberType) + "' is less " +
3536                                                       "accessible than field `" + GetSignatureForError () + "'");
3537                                 }
3538                         }
3539                 }
3540
3541                 protected void IsTypePermitted ()
3542                 {
3543                         if (MemberType.IsSpecialRuntimeType) {
3544                                 if (Parent is StateMachine) {
3545                                         Report.Error (4012, Location,
3546                                                 "Parameters or local variables of type `{0}' cannot be declared in async methods or iterators",
3547                                                 MemberType.GetSignatureForError ());
3548                                 } else if (Parent is HoistedStoreyClass) {
3549                                         Report.Error (4013, Location,
3550                                                 "Local variables of type `{0}' cannot be used inside anonymous methods, lambda expressions or query expressions",
3551                                                 MemberType.GetSignatureForError ());
3552                                 } else {
3553                                         Report.Error (610, Location,
3554                                                 "Field or property cannot be of type `{0}'", MemberType.GetSignatureForError ());
3555                                 }
3556                         }
3557                 }
3558
3559                 protected virtual bool CheckBase ()
3560                 {
3561                         CheckProtectedModifier ();
3562
3563                         return true;
3564                 }
3565
3566                 public override string GetSignatureForDocumentation ()
3567                 {
3568                         return Parent.GetSignatureForDocumentation () + "." + MemberName.Basename;
3569                 }
3570
3571                 protected virtual bool ResolveMemberType ()
3572                 {
3573                         if (member_type != null)
3574                                 throw new InternalErrorException ("Multi-resolve");
3575
3576                         member_type = type_expr.ResolveAsType (this);
3577                         return member_type != null;
3578                 }
3579         }
3580 }
3581