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                         var name = TypeNameParser.Escape (MemberName.Basename);
 353
 354                         if (Parent is TypeDefinition) {
 355                                 return Parent.GetSignatureForMetadata () + "+" + name;
 356                         }
 357
 358                         if (Parent != null && Parent.MemberName != null)
 359                                 return Parent.GetSignatureForMetadata () + "." + name;
 360
 361                         return name;
 362 #else
 363                         throw new NotImplementedException ();
 364 #endif
 365                 }
 366
 367                 public virtual void RemoveContainer (TypeContainer cont)
 368                 {
 369                         if (containers != null)
 370                                 containers.Remove (cont);
 371
 372                         var tc = Parent == Module ? Module : this;
 373                         tc.defined_names.Remove (cont.Basename);
 374                 }
 375
 376                 public virtual void VerifyMembers ()
 377                 {
 378                         if (containers != null) {
 379                                 foreach (TypeContainer tc in containers)
 380                                         tc.VerifyMembers ();
 381                         }
 382                 }
 383
 384                 public override void WriteDebugSymbol (MonoSymbolFile file)
 385                 {
 386                         if (containers != null) {
 387                                 foreach (TypeContainer tc in containers) {
 388                                         tc.WriteDebugSymbol (file);
 389                                 }
 390                         }
 391                 }
 392         }
 393
 394         public abstract class TypeDefinition : TypeContainer, ITypeDefinition
 395         {
 396                 //
 397                 // Different context is needed when resolving type container base
 398                 // types. Type names come from the parent scope but type parameter
 399                 // names from the container scope.
 400                 //
 401                 public struct BaseContext : IMemberContext
 402                 {
 403                         TypeContainer tc;
 404
 405                         public BaseContext (TypeContainer tc)
 406                         {
 407                                 this.tc = tc;
 408                         }
 409
 410                         #region IMemberContext Members
 411
 412                         public CompilerContext Compiler {
 413                                 get { return tc.Compiler; }
 414                         }
 415
 416                         public TypeSpec CurrentType {
 417                                 get { return tc.Parent.CurrentType; }
 418                         }
 419
 420                         public TypeParameters CurrentTypeParameters {
 421                                 get { return tc.PartialContainer.CurrentTypeParameters; }
 422                         }
 423
 424                         public MemberCore CurrentMemberDefinition {
 425                                 get { return tc; }
 426                         }
 427
 428                         public bool IsObsolete {
 429                                 get { return tc.IsObsolete; }
 430                         }
 431
 432                         public bool IsUnsafe {
 433                                 get { return tc.IsUnsafe; }
 434                         }
 435
 436                         public bool IsStatic {
 437                                 get { return tc.IsStatic; }
 438                         }
 439
 440                         public ModuleContainer Module {
 441                                 get { return tc.Module; }
 442                         }
 443
 444                         public string GetSignatureForError ()
 445                         {
 446                                 return tc.GetSignatureForError ();
 447                         }
 448
 449                         public ExtensionMethodCandidates LookupExtensionMethod (TypeSpec extensionType, string name, int arity)
 450                         {
 451                                 return null;
 452                         }
 453
 454                         public FullNamedExpression LookupNamespaceAlias (string name)
 455                         {
 456                                 return tc.Parent.LookupNamespaceAlias (name);
 457                         }
 458
 459                         public FullNamedExpression LookupNamespaceOrType (string name, int arity, LookupMode mode, Location loc)
 460                         {
 461                                 if (arity == 0) {
 462                                         var tp = CurrentTypeParameters;
 463                                         if (tp != null) {
 464                                                 TypeParameter t = tp.Find (name);
 465                                                 if (t != null)
 466                                                         return new TypeParameterExpr (t, loc);
 467                                         }
 468                                 }
 469
 470                                 return tc.Parent.LookupNamespaceOrType (name, arity, mode, loc);
 471                         }
 472
 473                         #endregion
 474                 }
 475
 476                 [Flags]
 477                 enum CachedMethods
 478                 {
 479                         Equals                          = 1,
 480                         GetHashCode                     = 1 << 1,
 481                         HasStaticFieldInitializer       = 1 << 2
 482                 }
 483
 484                 readonly List<MemberCore> members;
 485
 486                 // Holds a list of fields that have initializers
 487                 protected List<FieldInitializer> initialized_fields;
 488
 489                 // Holds a list of static fields that have initializers
 490                 protected List<FieldInitializer> initialized_static_fields;
 491
 492                 Dictionary<MethodSpec, Method> hoisted_base_call_proxies;
 493
 494                 Dictionary<string, FullNamedExpression> Cache = new Dictionary<string, FullNamedExpression> ();
 495
 496                 //
 497                 // Points to the first non-static field added to the container.
 498                 //
 499                 // This is an arbitrary choice.  We are interested in looking at _some_ non-static field,
 500                 // and the first one's as good as any.
 501                 //
 502                 protected FieldBase first_nonstatic_field;
 503
 504                 //
 505                 // This one is computed after we can distinguish interfaces
 506                 // from classes from the arraylist `type_bases'
 507                 //
 508                 protected TypeSpec base_type;
 509                 FullNamedExpression base_type_expr;     // TODO: It's temporary variable
 510                 protected TypeSpec[] iface_exprs;
 511
 512                 protected List<FullNamedExpression> type_bases;
 513
 514                 TypeDefinition InTransit;
 515
 516                 public TypeBuilder TypeBuilder;
 517                 GenericTypeParameterBuilder[] all_tp_builders;
 518                 //
 519                 // All recursive type parameters put together sharing same
 520                 // TypeParameter instances
 521                 //
 522                 TypeParameters all_type_parameters;
 523
 524                 public const string DefaultIndexerName = "Item";
 525
 526                 bool has_normal_indexers;
 527                 string indexer_name;
 528                 protected bool requires_delayed_unmanagedtype_check;
 529                 bool error;
 530                 bool members_defined;
 531                 bool members_defined_ok;
 532                 protected bool has_static_constructor;
 533
 534                 private CachedMethods cached_method;
 535
 536                 protected TypeSpec spec;
 537                 TypeSpec current_type;
 538
 539                 public int DynamicSitesCounter;
 540                 public int AnonymousMethodsCounter;
 541
 542                 static readonly string[] attribute_targets = new string[] { "type" };
 543
 544                 /// <remarks>
 545                 ///  The pending methods that need to be implemented
 546                 //   (interfaces or abstract methods)
 547                 /// </remarks>
 548                 PendingImplementation pending;
 549
 550                 public TypeDefinition (TypeContainer parent, MemberName name, Attributes attrs, MemberKind kind)
 551                         : base (parent, name, attrs, kind)
 552                 {
 553                         PartialContainer = this;
 554                         members = new List<MemberCore> ();
 555                 }
 556
 557                 #region Properties
 558
 559                 public List<FullNamedExpression> BaseTypeExpressions {
 560                         get {
 561                                 return type_bases;
 562                         }
 563                 }
 564
 565                 public override TypeSpec CurrentType {
 566                         get {
 567                                 if (current_type == null) {
 568                                         if (IsGenericOrParentIsGeneric) {
 569                                                 //
 570                                                 // Switch to inflated version as it's used by all expressions
 571                                                 //
 572                                                 var targs = CurrentTypeParameters == null ? TypeSpec.EmptyTypes : CurrentTypeParameters.Types;
 573                                                 current_type = spec.MakeGenericType (this, targs);
 574                                         } else {
 575                                                 current_type = spec;
 576                                         }
 577                                 }
 578
 579                                 return current_type;
 580                         }
 581                 }
 582
 583                 public override TypeParameters CurrentTypeParameters {
 584                         get {
 585                                 return PartialContainer.MemberName.TypeParameters;
 586                         }
 587                 }
 588
 589                 int CurrentTypeParametersStartIndex {
 590                         get {
 591                                 int total = all_tp_builders.Length;
 592                                 if (CurrentTypeParameters != null) {
 593                                         return total - CurrentTypeParameters.Count;
 594                                 }
 595                                 return total;
 596                         }
 597                 }
 598
 599                 public virtual AssemblyDefinition DeclaringAssembly {
 600                         get {
 601                                 return Module.DeclaringAssembly;
 602                         }
 603                 }
 604
 605                 IAssemblyDefinition ITypeDefinition.DeclaringAssembly {
 606                         get {
 607                                 return Module.DeclaringAssembly;
 608                         }
 609                 }
 610
 611                 public TypeSpec Definition {
 612                         get {
 613                                 return spec;
 614                         }
 615                 }
 616
 617                 public bool HasMembersDefined {
 618                         get {
 619                                 return members_defined;
 620                         }
 621                 }
 622
 623                 public bool HasInstanceConstructor {
 624                         get {
 625                                 return (caching_flags & Flags.HasInstanceConstructor) != 0;
 626                         }
 627                         set {
 628                                 caching_flags |= Flags.HasInstanceConstructor;
 629                         }
 630                 }
 631
 632                 // Indicated whether container has StructLayout attribute set Explicit
 633                 public bool HasExplicitLayout {
 634                         get { return (caching_flags & Flags.HasExplicitLayout) != 0; }
 635                         set { caching_flags |= Flags.HasExplicitLayout; }
 636                 }
 637
 638                 public bool HasOperators {
 639                         get {
 640                                 return (caching_flags & Flags.HasUserOperators) != 0;
 641                         }
 642                         set {
 643                                 caching_flags |= Flags.HasUserOperators;
 644                         }
 645                 }
 646
 647                 public bool HasStructLayout {
 648                         get { return (caching_flags & Flags.HasStructLayout) != 0; }
 649                         set { caching_flags |= Flags.HasStructLayout; }
 650                 }
 651
 652                 public TypeSpec[] Interfaces {
 653                         get {
 654                                 return iface_exprs;
 655                         }
 656                 }
 657
 658                 public bool IsGenericOrParentIsGeneric {
 659                         get {
 660                                 return all_type_parameters != null;
 661                         }
 662                 }
 663
 664                 public bool IsTopLevel {
 665                         get {
 666                                 return !(Parent is TypeDefinition);
 667                         }
 668                 }
 669
 670                 public bool IsPartial {
 671                         get {
 672                                 return (ModFlags & Modifiers.PARTIAL) != 0;
 673                         }
 674                 }
 675
 676                 //
 677                 // Returns true for secondary partial containers
 678                 //
 679                 bool IsPartialPart {
 680                         get {
 681                                 return PartialContainer != this;
 682                         }
 683                 }
 684
 685                 public MemberCache MemberCache {
 686                         get {
 687                                 return spec.MemberCache;
 688                         }
 689                 }
 690
 691                 public List<MemberCore> Members {
 692                         get {
 693                                 return members;
 694                         }
 695                 }
 696
 697                 string ITypeDefinition.Namespace {
 698                         get {
 699                                 var p = Parent;
 700                                 while (p.Kind != MemberKind.Namespace)
 701                                         p = p.Parent;
 702
 703                                 return p.MemberName == null ? null : p.GetSignatureForError ();
 704                         }
 705                 }
 706
 707                 public TypeParameters TypeParametersAll {
 708                         get {
 709                                 return all_type_parameters;
 710                         }
 711                 }
 712
 713                 public override string[] ValidAttributeTargets {
 714                         get {
 715                                 return attribute_targets;
 716                         }
 717                 }
 718
 719                 #endregion
 720
 721                 public override void Accept (StructuralVisitor visitor)
 722                 {
 723                         visitor.Visit (this);
 724                 }
 725
 726                 public void AddMember (MemberCore symbol)
 727                 {
 728                         if (symbol.MemberName.ExplicitInterface != null) {
 729                                 if (!(Kind == MemberKind.Class || Kind == MemberKind.Struct)) {
 730                                         Report.Error (541, symbol.Location,
 731                                                 "`{0}': explicit interface declaration can only be declared in a class or struct",
 732                                                 symbol.GetSignatureForError ());
 733                                 }
 734                         }
 735
 736                         AddNameToContainer (symbol, symbol.MemberName.Basename);
 737                         members.Add (symbol);
 738                 }
 739
 740                 public override void AddTypeContainer (TypeContainer tc)
 741                 {
 742                         AddNameToContainer (tc, tc.Basename);
 743
 744                         if (containers == null)
 745                                 containers = new List<TypeContainer> ();
 746
 747                         members.Add (tc);
 748                         base.AddTypeContainer (tc);
 749                 }
 750
 751                 public override void AddCompilerGeneratedClass (CompilerGeneratedContainer c)
 752                 {
 753                         members.Add (c);
 754
 755                         if (containers == null)
 756                                 containers = new List<TypeContainer> ();
 757
 758                         base.AddCompilerGeneratedClass (c);
 759                 }
 760
 761                 //
 762                 // Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 763                 //
 764                 public virtual void AddNameToContainer (MemberCore symbol, string name)
 765                 {
 766                         if (((ModFlags | symbol.ModFlags) & Modifiers.COMPILER_GENERATED) != 0)
 767                                 return;
 768
 769                         MemberCore mc;
 770                         if (!PartialContainer.defined_names.TryGetValue (name, out mc)) {
 771                                 PartialContainer.defined_names.Add (name, symbol);
 772                                 return;
 773                         }
 774
 775                         if (symbol.EnableOverloadChecks (mc))
 776                                 return;
 777
 778                         InterfaceMemberBase im = mc as InterfaceMemberBase;
 779                         if (im != null && im.IsExplicitImpl)
 780                                 return;
 781
 782                         Report.SymbolRelatedToPreviousError (mc);
 783                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
 784                                 Error_MissingPartialModifier (symbol);
 785                                 return;
 786                         }
 787
 788                         if (symbol is TypeParameter) {
 789                                 Report.Error (692, symbol.Location,
 790                                         "Duplicate type parameter `{0}'", symbol.GetSignatureForError ());
 791                         } else {
 792                                 Report.Error (102, symbol.Location,
 793                                         "The type `{0}' already contains a definition for `{1}'",
 794                                         GetSignatureForError (), name);
 795                         }
 796
 797                         return;
 798                 }
 799
 800                 public void AddConstructor (Constructor c)
 801                 {
 802                         AddConstructor (c, false);
 803                 }
 804
 805                 public void AddConstructor (Constructor c, bool isDefault)
 806                 {
 807                         bool is_static = (c.ModFlags & Modifiers.STATIC) != 0;
 808                         if (!isDefault)
 809                                 AddNameToContainer (c, is_static ? Constructor.TypeConstructorName : Constructor.ConstructorName);
 810
 811                         if (is_static && c.ParameterInfo.IsEmpty) {
 812                                 PartialContainer.has_static_constructor = true;
 813                         } else {
 814                                 PartialContainer.HasInstanceConstructor = true;
 815                         }
 816
 817                         members.Add (c);
 818                 }
 819
 820                 public bool AddField (FieldBase field)
 821                 {
 822                         AddMember (field);
 823
 824                         if ((field.ModFlags & Modifiers.STATIC) != 0)
 825                                 return true;
 826
 827                         var first_field = PartialContainer.first_nonstatic_field;
 828                         if (first_field == null) {
 829                                 PartialContainer.first_nonstatic_field = field;
 830                                 return true;
 831                         }
 832
 833                         if (Kind == MemberKind.Struct && first_field.Parent != field.Parent) {
 834                                 Report.SymbolRelatedToPreviousError (first_field.Parent);
 835                                 Report.Warning (282, 3, field.Location,
 836                                         "struct instance field `{0}' found in different declaration from instance field `{1}'",
 837                                         field.GetSignatureForError (), first_field.GetSignatureForError ());
 838                         }
 839                         return true;
 840                 }
 841
 842                 /// <summary>
 843                 /// Indexer has special handling in constrast to other AddXXX because the name can be driven by IndexerNameAttribute
 844                 /// </summary>
 845                 public void AddIndexer (Indexer i)
 846                 {
 847                         members.Add (i);
 848                 }
 849
 850                 public void AddOperator (Operator op)
 851                 {
 852                         PartialContainer.HasOperators = true;
 853                         AddMember (op);
 854                 }
 855
 856                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 857                 {
 858                         if (has_normal_indexers && a.Type == pa.DefaultMember) {
 859                                 Report.Error (646, a.Location, "Cannot specify the `DefaultMember' attribute on type containing an indexer");
 860                                 return;
 861                         }
 862
 863                         if (a.Type == pa.Required) {
 864                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
 865                                 return;
 866                         }
 867
 868                         TypeBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
 869                 }
 870
 871                 public override AttributeTargets AttributeTargets {
 872                         get {
 873                                 throw new NotSupportedException ();
 874                         }
 875                 }
 876
 877                 public TypeSpec BaseType {
 878                         get {
 879                                 return spec.BaseType;
 880                         }
 881                 }
 882
 883                 protected virtual TypeAttributes TypeAttr {
 884                         get {
 885                                 return ModifiersExtensions.TypeAttr (ModFlags, IsTopLevel);
 886                         }
 887                 }
 888
 889                 public int TypeParametersCount {
 890                         get {
 891                                 return MemberName.Arity;
 892                         }
 893                 }
 894
 895                 TypeParameterSpec[] ITypeDefinition.TypeParameters {
 896                         get {
 897                                 return PartialContainer.CurrentTypeParameters.Types;
 898                         }
 899                 }
 900
 901                 public string GetAttributeDefaultMember ()
 902                 {
 903                         return indexer_name ?? DefaultIndexerName;
 904                 }
 905
 906                 public bool IsComImport {
 907                         get {
 908                                 if (OptAttributes == null)
 909                                         return false;
 910
 911                                 return OptAttributes.Contains (Module.PredefinedAttributes.ComImport);
 912                         }
 913                 }
 914
 915                 public virtual void RegisterFieldForInitialization (MemberCore field, FieldInitializer expression)
 916                 {
 917                         if (IsPartialPart)
 918                                 PartialContainer.RegisterFieldForInitialization (field, expression);
 919
 920                         if ((field.ModFlags & Modifiers.STATIC) != 0){
 921                                 if (initialized_static_fields == null) {
 922                                         HasStaticFieldInitializer = true;
 923                                         initialized_static_fields = new List<FieldInitializer> (4);
 924                                 }
 925
 926                                 initialized_static_fields.Add (expression);
 927                         } else {
 928                                 if (initialized_fields == null)
 929                                         initialized_fields = new List<FieldInitializer> (4);
 930
 931                                 initialized_fields.Add (expression);
 932                         }
 933                 }
 934
 935                 public void ResolveFieldInitializers (BlockContext ec)
 936                 {
 937                         Debug.Assert (!IsPartialPart);
 938
 939                         if (ec.IsStatic) {
 940                                 if (initialized_static_fields == null)
 941                                         return;
 942
 943                                 bool has_complex_initializer = !ec.Module.Compiler.Settings.Optimize;
 944                                 int i;
 945                                 ExpressionStatement [] init = new ExpressionStatement [initialized_static_fields.Count];
 946                                 for (i = 0; i < initialized_static_fields.Count; ++i) {
 947                                         FieldInitializer fi = initialized_static_fields [i];
 948                                         ExpressionStatement s = fi.ResolveStatement (ec);
 949                                         if (s == null) {
 950                                                 s = EmptyExpressionStatement.Instance;
 951                                         } else if (!fi.IsSideEffectFree) {
 952                                                 has_complex_initializer |= true;
 953                                         }
 954
 955                                         init [i] = s;
 956                                 }
 957
 958                                 for (i = 0; i < initialized_static_fields.Count; ++i) {
 959                                         FieldInitializer fi = initialized_static_fields [i];
 960                                         //
 961                                         // Need special check to not optimize code like this
 962                                         // static int a = b = 5;
 963                                         // static int b = 0;
 964                                         //
 965                                         if (!has_complex_initializer && fi.IsDefaultInitializer)
 966                                                 continue;
 967
 968                                         ec.CurrentBlock.AddScopeStatement (new StatementExpression (init [i]));
 969                                 }
 970
 971                                 return;
 972                         }
 973
 974                         if (initialized_fields == null)
 975                                 return;
 976
 977                         for (int i = 0; i < initialized_fields.Count; ++i) {
 978                                 FieldInitializer fi = initialized_fields [i];
 979                                 ExpressionStatement s = fi.ResolveStatement (ec);
 980                                 if (s == null)
 981                                         continue;
 982
 983                                 //
 984                                 // Field is re-initialized to its default value => removed
 985                                 //
 986                                 if (fi.IsDefaultInitializer && ec.Module.Compiler.Settings.Optimize)
 987                                         continue;
 988
 989                                 ec.CurrentBlock.AddScopeStatement (new StatementExpression (s));
 990                         }
 991                 }
 992
 993                 public override string DocComment {
 994                         get {
 995                                 return comment;
 996                         }
 997                         set {
 998                                 if (value == null)
 999                                         return;
1000
1001                                 comment += value;
1002                         }
1003                 }
1004
1005                 public PendingImplementation PendingImplementations {
1006                         get { return pending; }
1007                 }
1008
1009                 internal override void GenerateDocComment (DocumentationBuilder builder)
1010                 {
1011                         if (IsPartialPart)
1012                                 return;
1013
1014                         base.GenerateDocComment (builder);
1015
1016                         foreach (var member in members)
1017                                 member.GenerateDocComment (builder);
1018                 }
1019
1020                 public TypeSpec GetAttributeCoClass ()
1021                 {
1022                         if (OptAttributes == null)
1023                                 return null;
1024
1025                         Attribute a = OptAttributes.Search (Module.PredefinedAttributes.CoClass);
1026                         if (a == null)
1027                                 return null;
1028
1029                         return a.GetCoClassAttributeValue ();
1030                 }
1031
1032                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
1033                 {
1034                         Attribute a = null;
1035                         if (OptAttributes != null) {
1036                                 a = OptAttributes.Search (pa);
1037                         }
1038
1039                         if (a == null)
1040                                 return null;
1041
1042                         return a.GetAttributeUsageAttribute ();
1043                 }
1044
1045                 public virtual CompilationSourceFile GetCompilationSourceFile ()
1046                 {
1047                         TypeContainer ns = Parent;
1048                         while (true) {
1049                                 var sf = ns as CompilationSourceFile;
1050                                 if (sf != null)
1051                                         return sf;
1052
1053                                 ns = ns.Parent;
1054                         }
1055                 }
1056
1057                 public virtual void AddBasesForPart (List<FullNamedExpression> bases)
1058                 {
1059                         type_bases = bases;
1060                 }
1061
1062                 /// <summary>
1063                 ///   This function computes the Base class and also the
1064                 ///   list of interfaces that the class or struct @c implements.
1065                 ///
1066                 ///   The return value is an array (might be null) of
1067                 ///   interfaces implemented (as Types).
1068                 ///
1069                 ///   The @base_class argument is set to the base object or null
1070                 ///   if this is `System.Object'.
1071                 /// </summary>
1072                 protected virtual TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
1073                 {
1074                         base_class = null;
1075                         if (type_bases == null)
1076                                 return null;
1077
1078                         int count = type_bases.Count;
1079                         TypeSpec[] ifaces = null;
1080                         var base_context = new BaseContext (this);
1081                         for (int i = 0, j = 0; i < count; i++){
1082                                 FullNamedExpression fne = type_bases [i];
1083
1084                                 var fne_resolved = fne.ResolveAsType (base_context);
1085                                 if (fne_resolved == null)
1086                                         continue;
1087
1088                                 if (i == 0 && Kind == MemberKind.Class && !fne_resolved.IsInterface) {
1089                                         if (fne_resolved.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
1090                                                 Report.Error (1965, Location, "Class `{0}' cannot derive from the dynamic type",
1091                                                         GetSignatureForError ());
1092
1093                                                 continue;
1094                                         }
1095
1096                                         base_type = fne_resolved;
1097                                         base_class = fne;
1098                                         continue;
1099                                 }
1100
1101                                 if (ifaces == null)
1102                                         ifaces = new TypeSpec [count - i];
1103
1104                                 if (fne_resolved.IsInterface) {
1105                                         for (int ii = 0; ii < j; ++ii) {
1106                                                 if (fne_resolved == ifaces [ii]) {
1107                                                         Report.Error (528, Location, "`{0}' is already listed in interface list",
1108                                                                 fne_resolved.GetSignatureForError ());
1109                                                         break;
1110                                                 }
1111                                         }
1112
1113                                         if (Kind == MemberKind.Interface && !IsAccessibleAs (fne_resolved)) {
1114                                                 Report.Error (61, fne.Location,
1115                                                         "Inconsistent accessibility: base interface `{0}' is less accessible than interface `{1}'",
1116                                                         fne_resolved.GetSignatureForError (), GetSignatureForError ());
1117                                         }
1118                                 } else {
1119                                         Report.SymbolRelatedToPreviousError (fne_resolved);
1120                                         if (Kind != MemberKind.Class) {
1121                                                 Report.Error (527, fne.Location, "Type `{0}' in interface list is not an interface", fne_resolved.GetSignatureForError ());
1122                                         } else if (base_class != null)
1123                                                 Report.Error (1721, fne.Location, "`{0}': Classes cannot have multiple base classes (`{1}' and `{2}')",
1124                                                         GetSignatureForError (), base_class.GetSignatureForError (), fne_resolved.GetSignatureForError ());
1125                                         else {
1126                                                 Report.Error (1722, fne.Location, "`{0}': Base class `{1}' must be specified as first",
1127                                                         GetSignatureForError (), fne_resolved.GetSignatureForError ());
1128                                         }
1129                                 }
1130
1131                                 ifaces [j++] = fne_resolved;
1132                         }
1133
1134                         return ifaces;
1135                 }
1136
1137                 //
1138                 // Checks that some operators come in pairs:
1139                 //  == and !=
1140                 // > and <
1141                 // >= and <=
1142                 // true and false
1143                 //
1144                 // They are matched based on the return type and the argument types
1145                 //
1146                 void CheckPairedOperators ()
1147                 {
1148                         bool has_equality_or_inequality = false;
1149                         List<Operator.OpType> found_matched = new List<Operator.OpType> ();
1150
1151                         for (int i = 0; i < members.Count; ++i) {
1152                                 var o_a = members[i] as Operator;
1153                                 if (o_a == null)
1154                                         continue;
1155
1156                                 var o_type = o_a.OperatorType;
1157                                 if (o_type == Operator.OpType.Equality || o_type == Operator.OpType.Inequality)
1158                                         has_equality_or_inequality = true;
1159
1160                                 if (found_matched.Contains (o_type))
1161                                         continue;
1162
1163                                 var matching_type = o_a.GetMatchingOperator ();
1164                                 if (matching_type == Operator.OpType.TOP) {
1165                                         continue;
1166                                 }
1167
1168                                 bool pair_found = false;
1169                                 for (int ii = i + 1; ii < members.Count; ++ii) {
1170                                         var o_b = members[ii] as Operator;
1171                                         if (o_b == null || o_b.OperatorType != matching_type)
1172                                                 continue;
1173
1174                                         if (!TypeSpecComparer.IsEqual (o_a.ReturnType, o_b.ReturnType))
1175                                                 continue;
1176
1177                                         if (!TypeSpecComparer.Equals (o_a.ParameterTypes, o_b.ParameterTypes))
1178                                                 continue;
1179
1180                                         found_matched.Add (matching_type);
1181                                         pair_found = true;
1182                                         break;
1183                                 }
1184
1185                                 if (!pair_found) {
1186                                         Report.Error (216, o_a.Location,
1187                                                 "The operator `{0}' requires a matching operator `{1}' to also be defined",
1188                                                 o_a.GetSignatureForError (), Operator.GetName (matching_type));
1189                                 }
1190                         }
1191
1192                         if (has_equality_or_inequality) {
1193                                 if (!HasEquals)
1194                                         Report.Warning (660, 2, Location, "`{0}' defines operator == or operator != but does not override Object.Equals(object o)",
1195                                                 GetSignatureForError ());
1196
1197                                 if (!HasGetHashCode)
1198                                         Report.Warning (661, 2, Location, "`{0}' defines operator == or operator != but does not override Object.GetHashCode()",
1199                                                 GetSignatureForError ());
1200                         }
1201                 }
1202
1203                 public override void CreateMetadataName (StringBuilder sb)
1204                 {
1205                         if (Parent.MemberName != null) {
1206                                 Parent.CreateMetadataName (sb);
1207
1208                                 if (sb.Length != 0) {
1209                                         sb.Append (".");
1210                                 }
1211                         }
1212
1213                         sb.Append (MemberName.Basename);
1214                 }
1215
1216                 bool CreateTypeBuilder ()
1217                 {
1218                         //
1219                         // Sets .size to 1 for structs with no instance fields
1220                         //
1221                         int type_size = Kind == MemberKind.Struct && first_nonstatic_field == null ? 1 : 0;
1222
1223                         var parent_def = Parent as TypeDefinition;
1224                         if (parent_def == null) {
1225                                 var sb = new StringBuilder ();
1226                                 CreateMetadataName (sb);
1227                                 TypeBuilder = Module.CreateBuilder (sb.ToString (), TypeAttr, type_size);
1228                         } else {
1229                                 TypeBuilder = parent_def.TypeBuilder.DefineNestedType (Basename, TypeAttr, null, type_size);
1230                         }
1231
1232                         if (DeclaringAssembly.Importer != null)
1233                                 DeclaringAssembly.Importer.AddCompiledType (TypeBuilder, spec);
1234
1235                         spec.SetMetaInfo (TypeBuilder);
1236                         spec.MemberCache = new MemberCache (this);
1237
1238                         TypeParameters parentAllTypeParameters = null;
1239                         if (parent_def != null) {
1240                                 spec.DeclaringType = Parent.CurrentType;
1241                                 parent_def.MemberCache.AddMember (spec);
1242                                 parentAllTypeParameters = parent_def.all_type_parameters;
1243                         }
1244
1245                         if (MemberName.TypeParameters != null || parentAllTypeParameters != null) {
1246                                 var tparam_names = CreateTypeParameters (parentAllTypeParameters);
1247
1248                                 all_tp_builders = TypeBuilder.DefineGenericParameters (tparam_names);
1249
1250                                 if (CurrentTypeParameters != null)
1251                                         CurrentTypeParameters.Define (all_tp_builders, spec, CurrentTypeParametersStartIndex, this);
1252                         }
1253
1254                         return true;
1255                 }
1256
1257                 string[] CreateTypeParameters (TypeParameters parentAllTypeParameters)
1258                 {
1259                         string[] names;
1260                         int parent_offset = 0;
1261                         if (parentAllTypeParameters != null) {
1262                                 if (CurrentTypeParameters == null) {
1263                                         all_type_parameters = parentAllTypeParameters;
1264                                         return parentAllTypeParameters.GetAllNames ();
1265                                 }
1266
1267                                 names = new string[parentAllTypeParameters.Count + CurrentTypeParameters.Count];
1268                                 all_type_parameters = new TypeParameters (names.Length);
1269                                 all_type_parameters.Add (parentAllTypeParameters);
1270
1271                                 parent_offset = all_type_parameters.Count;
1272                                 for (int i = 0; i < parent_offset; ++i)
1273                                         names[i] = all_type_parameters[i].MemberName.Name;
1274
1275                         } else {
1276                                 names = new string[CurrentTypeParameters.Count];
1277                         }
1278
1279                         for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
1280                                 if (all_type_parameters != null)
1281                                         all_type_parameters.Add (MemberName.TypeParameters[i]);
1282
1283                                 var name = CurrentTypeParameters[i].MemberName.Name;
1284                                 names[parent_offset + i] = name;
1285                                 for (int ii = 0; ii < parent_offset + i; ++ii) {
1286                                         if (names[ii] != name)
1287                                                 continue;
1288
1289                                         var tp = CurrentTypeParameters[i];
1290                                         var conflict = all_type_parameters[ii];
1291
1292                                         tp.WarningParentNameConflict (conflict);
1293                                 }
1294                         }
1295
1296                         if (all_type_parameters == null)
1297                                 all_type_parameters = CurrentTypeParameters;
1298
1299                         return names;
1300                 }
1301
1302
1303                 public SourceMethodBuilder CreateMethodSymbolEntry ()
1304                 {
1305                         if (Module.DeclaringAssembly.SymbolWriter == null)
1306                                 return null;
1307
1308                         var source_file = GetCompilationSourceFile ();
1309                         if (source_file == null)
1310                                 return null;
1311
1312                         return new SourceMethodBuilder (source_file.SymbolUnitEntry);
1313                 }
1314
1315                 //
1316                 // Creates a proxy base method call inside this container for hoisted base member calls
1317                 //
1318                 public MethodSpec CreateHoistedBaseCallProxy (ResolveContext rc, MethodSpec method)
1319                 {
1320                         Method proxy_method;
1321
1322                         //
1323                         // One proxy per base method is enough
1324                         //
1325                         if (hoisted_base_call_proxies == null) {
1326                                 hoisted_base_call_proxies = new Dictionary<MethodSpec, Method> ();
1327                                 proxy_method = null;
1328                         } else {
1329                                 hoisted_base_call_proxies.TryGetValue (method, out proxy_method);
1330                         }
1331
1332                         if (proxy_method == null) {
1333                                 string name = CompilerGeneratedContainer.MakeName (method.Name, null, "BaseCallProxy", hoisted_base_call_proxies.Count);
1334                                 var base_parameters = new Parameter[method.Parameters.Count];
1335                                 for (int i = 0; i < base_parameters.Length; ++i) {
1336                                         var base_param = method.Parameters.FixedParameters[i];
1337                                         base_parameters[i] = new Parameter (new TypeExpression (method.Parameters.Types[i], Location),
1338                                                 base_param.Name, base_param.ModFlags, null, Location);
1339                                         base_parameters[i].Resolve (this, i);
1340                                 }
1341
1342                                 var cloned_params = ParametersCompiled.CreateFullyResolved (base_parameters, method.Parameters.Types);
1343                                 if (method.Parameters.HasArglist) {
1344                                         cloned_params.FixedParameters[0] = new Parameter (null, "__arglist", Parameter.Modifier.NONE, null, Location);
1345                                         cloned_params.Types[0] = Module.PredefinedTypes.RuntimeArgumentHandle.Resolve ();
1346                                 }
1347
1348                                 MemberName member_name;
1349                                 TypeArguments targs = null;
1350                                 if (method.IsGeneric) {
1351                                         //
1352                                         // Copy all base generic method type parameters info
1353                                         //
1354                                         var hoisted_tparams = method.GenericDefinition.TypeParameters;
1355                                         var tparams = new TypeParameters ();
1356
1357                                         targs = new TypeArguments ();
1358                                         targs.Arguments = new TypeSpec[hoisted_tparams.Length];
1359                                         for (int i = 0; i < hoisted_tparams.Length; ++i) {
1360                                                 var tp = hoisted_tparams[i];
1361                                                 tparams.Add (new TypeParameter (tp, null, new MemberName (tp.Name, Location), null));
1362
1363                                                 targs.Add (new SimpleName (tp.Name, Location));
1364                                                 targs.Arguments[i] = tp;
1365                                         }
1366
1367                                         member_name = new MemberName (name, tparams, Location);
1368                                 } else {
1369                                         member_name = new MemberName (name);
1370                                 }
1371
1372                                 // Compiler generated proxy
1373                                 proxy_method = new Method (this, new TypeExpression (method.ReturnType, Location),
1374                                         Modifiers.PRIVATE | Modifiers.COMPILER_GENERATED | Modifiers.DEBUGGER_HIDDEN,
1375                                         member_name, cloned_params, null);
1376
1377                                 var block = new ToplevelBlock (Compiler, proxy_method.ParameterInfo, Location) {
1378                                         IsCompilerGenerated = true
1379                                 };
1380
1381                                 var mg = MethodGroupExpr.CreatePredefined (method, method.DeclaringType, Location);
1382                                 mg.InstanceExpression = new BaseThis (method.DeclaringType, Location);
1383                                 if (targs != null)
1384                                         mg.SetTypeArguments (rc, targs);
1385
1386                                 // Get all the method parameters and pass them as arguments
1387                                 var real_base_call = new Invocation (mg, block.GetAllParametersArguments ());
1388                                 Statement statement;
1389                                 if (method.ReturnType.Kind == MemberKind.Void)
1390                                         statement = new StatementExpression (real_base_call);
1391                                 else
1392                                         statement = new Return (real_base_call, Location);
1393
1394                                 block.AddStatement (statement);
1395                                 proxy_method.Block = block;
1396
1397                                 members.Add (proxy_method);
1398                                 proxy_method.Define ();
1399
1400                                 hoisted_base_call_proxies.Add (method, proxy_method);
1401                         }
1402
1403                         return proxy_method.Spec;
1404                 }
1405
1406                 protected bool DefineBaseTypes ()
1407                 {
1408                         iface_exprs = ResolveBaseTypes (out base_type_expr);
1409                         bool set_base_type;
1410
1411                         if (IsPartialPart) {
1412                                 set_base_type = false;
1413
1414                                 if (base_type_expr != null) {
1415                                         if (PartialContainer.base_type_expr != null && PartialContainer.base_type != base_type) {
1416                                                 Report.SymbolRelatedToPreviousError (base_type_expr.Location, "");
1417                                                 Report.Error (263, Location,
1418                                                         "Partial declarations of `{0}' must not specify different base classes",
1419                                                         GetSignatureForError ());
1420                                         } else {
1421                                                 PartialContainer.base_type_expr = base_type_expr;
1422                                                 PartialContainer.base_type = base_type;
1423                                                 set_base_type = true;
1424                                         }
1425                                 }
1426
1427                                 if (iface_exprs != null) {
1428                                         if (PartialContainer.iface_exprs == null)
1429                                                 PartialContainer.iface_exprs = iface_exprs;
1430                                         else {
1431                                                 var ifaces = new List<TypeSpec> (PartialContainer.iface_exprs);
1432                                                 foreach (var iface_partial in iface_exprs) {
1433                                                         if (ifaces.Contains (iface_partial))
1434                                                                 continue;
1435
1436                                                         ifaces.Add (iface_partial);
1437                                                 }
1438
1439                                                 PartialContainer.iface_exprs = ifaces.ToArray ();
1440                                         }
1441                                 }
1442
1443                                 PartialContainer.members.AddRange (members);
1444                                 if (containers != null) {
1445                                         if (PartialContainer.containers == null)
1446                                                 PartialContainer.containers = new List<TypeContainer> ();
1447
1448                                         PartialContainer.containers.AddRange (containers);
1449                                 }
1450
1451                                 members_defined = members_defined_ok = true;
1452                                 caching_flags |= Flags.CloseTypeCreated;
1453                         } else {
1454                                 set_base_type = true;
1455                         }
1456
1457                         var cycle = CheckRecursiveDefinition (this);
1458                         if (cycle != null) {
1459                                 Report.SymbolRelatedToPreviousError (cycle);
1460                                 if (this is Interface) {
1461                                         Report.Error (529, Location,
1462                                                 "Inherited interface `{0}' causes a cycle in the interface hierarchy of `{1}'",
1463                                             GetSignatureForError (), cycle.GetSignatureForError ());
1464
1465                                         iface_exprs = null;
1466                                 } else {
1467                                         Report.Error (146, Location,
1468                                                 "Circular base class dependency involving `{0}' and `{1}'",
1469                                                 GetSignatureForError (), cycle.GetSignatureForError ());
1470
1471                                         base_type = null;
1472                                 }
1473                         }
1474
1475                         if (iface_exprs != null) {
1476                                 foreach (var iface_type in iface_exprs) {
1477                                         // Prevents a crash, the interface might not have been resolved: 442144
1478                                         if (iface_type == null)
1479                                                 continue;
1480
1481                                         if (!spec.AddInterfaceDefined (iface_type))
1482                                                 continue;
1483
1484                                         TypeBuilder.AddInterfaceImplementation (iface_type.GetMetaInfo ());
1485
1486                                         // Ensure the base is always setup
1487                                         var compiled_iface = iface_type.MemberDefinition as Interface;
1488                                         if (compiled_iface != null) {
1489                                                 // TODO: Need DefineBaseType only
1490                                                 compiled_iface.DefineContainer ();
1491                                         }
1492
1493                                         if (iface_type.Interfaces != null) {
1494                                                 var base_ifaces = new List<TypeSpec> (iface_type.Interfaces);
1495                                                 for (int i = 0; i < base_ifaces.Count; ++i) {
1496                                                         var ii_iface_type = base_ifaces[i];
1497                                                         if (spec.AddInterfaceDefined (ii_iface_type)) {
1498                                                                 TypeBuilder.AddInterfaceImplementation (ii_iface_type.GetMetaInfo ());
1499
1500                                                                 if (ii_iface_type.Interfaces != null)
1501                                                                         base_ifaces.AddRange (ii_iface_type.Interfaces);
1502                                                         }
1503                                                 }
1504                                         }
1505                                 }
1506                         }
1507
1508                         if (Kind == MemberKind.Interface) {
1509                                 spec.BaseType = Compiler.BuiltinTypes.Object;
1510                                 return true;
1511                         }
1512
1513                         if (set_base_type) {
1514                                 if (base_type != null) {
1515                                         spec.BaseType = base_type;
1516
1517                                         // Set base type after type creation
1518                                         TypeBuilder.SetParent (base_type.GetMetaInfo ());
1519                                 } else {
1520                                         TypeBuilder.SetParent (null);
1521                                 }
1522                         }
1523
1524                         return true;
1525                 }
1526
1527                 public override void PrepareEmit ()
1528                 {
1529                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
1530                                 return;
1531
1532                         foreach (var member in members) {
1533                                 var pm = member as IParametersMember;
1534                                 if (pm != null) {
1535
1536                                         var p = pm.Parameters;
1537                                         if (p.IsEmpty)
1538                                                 continue;
1539
1540                                         ((ParametersCompiled) p).ResolveDefaultValues (member);
1541                                 }
1542
1543                                 var c = member as Const;
1544                                 if (c != null)
1545                                         c.DefineValue ();
1546                         }
1547
1548                         base.PrepareEmit ();
1549                 }
1550
1551                 //
1552                 // Defines the type in the appropriate ModuleBuilder or TypeBuilder.
1553                 //
1554                 public override bool CreateContainer ()
1555                 {
1556                         if (TypeBuilder != null)
1557                                 return !error;
1558
1559                         if (error)
1560                                 return false;
1561
1562                         if (IsPartialPart) {
1563                                 spec = PartialContainer.spec;
1564                                 TypeBuilder = PartialContainer.TypeBuilder;
1565                                 all_tp_builders = PartialContainer.all_tp_builders;
1566                                 all_type_parameters = PartialContainer.all_type_parameters;
1567                         } else {
1568                                 if (!CreateTypeBuilder ()) {
1569                                         error = true;
1570                                         return false;
1571                                 }
1572                         }
1573
1574                         return base.CreateContainer ();
1575                 }
1576
1577                 protected override void DoDefineContainer ()
1578                 {
1579                         DefineBaseTypes ();
1580
1581                         DoResolveTypeParameters ();
1582                 }
1583
1584                 //
1585                 // Replaces normal spec with predefined one when compiling corlib
1586                 // and this type container defines predefined type
1587                 //
1588                 public void SetPredefinedSpec (BuiltinTypeSpec spec)
1589                 {
1590                         // When compiling build-in types we start with two
1591                         // version of same type. One is of BuiltinTypeSpec and
1592                         // second one is ordinary TypeSpec. The unification
1593                         // happens at later stage when we know which type
1594                         // really matches the builtin type signature. However
1595                         // that means TypeSpec create during CreateType of this
1596                         // type has to be replaced with builtin one
1597                         //
1598                         spec.SetMetaInfo (TypeBuilder);
1599                         spec.MemberCache = this.spec.MemberCache;
1600                         spec.DeclaringType = this.spec.DeclaringType;
1601
1602                         this.spec = spec;
1603                         current_type = null;
1604                 }
1605
1606                 void UpdateTypeParameterConstraints (TypeDefinition part)
1607                 {
1608                         for (int i = 0; i < CurrentTypeParameters.Count; i++) {
1609                                 if (CurrentTypeParameters[i].AddPartialConstraints (part, part.MemberName.TypeParameters[i]))
1610                                         continue;
1611
1612                                 Report.SymbolRelatedToPreviousError (Location, "");
1613                                 Report.Error (265, part.Location,
1614                                         "Partial declarations of `{0}' have inconsistent constraints for type parameter `{1}'",
1615                                         GetSignatureForError (), CurrentTypeParameters[i].GetSignatureForError ());
1616                         }
1617                 }
1618
1619                 public override void RemoveContainer (TypeContainer cont)
1620                 {
1621                         base.RemoveContainer (cont);
1622                         Members.Remove (cont);
1623                         Cache.Remove (cont.Basename);
1624                 }
1625
1626                 protected virtual bool DoResolveTypeParameters ()
1627                 {
1628                         var tparams = CurrentTypeParameters;
1629                         if (tparams == null)
1630                                 return true;
1631
1632                         var base_context = new BaseContext (this);
1633                         for (int i = 0; i < tparams.Count; ++i) {
1634                                 var tp = tparams[i];
1635
1636                                 if (!tp.ResolveConstraints (base_context)) {
1637                                         error = true;
1638                                         return false;
1639                                 }
1640                         }
1641
1642                         if (IsPartialPart) {
1643                                 PartialContainer.UpdateTypeParameterConstraints (this);
1644                         }
1645
1646                         return true;
1647                 }
1648
1649                 TypeSpec CheckRecursiveDefinition (TypeDefinition tc)
1650                 {
1651                         if (InTransit != null)
1652                                 return spec;
1653
1654                         InTransit = tc;
1655
1656                         if (base_type != null) {
1657                                 var ptc = base_type.MemberDefinition as TypeDefinition;
1658                                 if (ptc != null && ptc.CheckRecursiveDefinition (this) != null)
1659                                         return base_type;
1660                         }
1661
1662                         if (iface_exprs != null) {
1663                                 foreach (var iface in iface_exprs) {
1664                                         // the interface might not have been resolved, prevents a crash, see #442144
1665                                         if (iface == null)
1666                                                 continue;
1667                                         var ptc = iface.MemberDefinition as Interface;
1668                                         if (ptc != null && ptc.CheckRecursiveDefinition (this) != null)
1669                                                 return iface;
1670                                 }
1671                         }
1672
1673                         if (!IsTopLevel && Parent.PartialContainer.CheckRecursiveDefinition (this) != null)
1674                                 return spec;
1675
1676                         InTransit = null;
1677                         return null;
1678                 }
1679
1680                 /// <summary>
1681                 ///   Populates our TypeBuilder with fields and methods
1682                 /// </summary>
1683                 public sealed override bool Define ()
1684                 {
1685                         if (members_defined)
1686                                 return members_defined_ok;
1687
1688                         members_defined_ok = DoDefineMembers ();
1689                         members_defined = true;
1690
1691                         base.Define ();
1692
1693                         return members_defined_ok;
1694                 }
1695
1696                 protected virtual bool DoDefineMembers ()
1697                 {
1698                         Debug.Assert (!IsPartialPart);
1699
1700                         if (iface_exprs != null) {
1701                                 foreach (var iface_type in iface_exprs) {
1702                                         if (iface_type == null)
1703                                                 continue;
1704
1705                                         // Ensure the base is always setup
1706                                         var compiled_iface = iface_type.MemberDefinition as Interface;
1707                                         if (compiled_iface != null)
1708                                                 compiled_iface.Define ();
1709
1710                                         if (Kind == MemberKind.Interface)
1711                                                 MemberCache.AddInterface (iface_type);
1712
1713                                         ObsoleteAttribute oa = iface_type.GetAttributeObsolete ();
1714                                         if (oa != null && !IsObsolete)
1715                                                 AttributeTester.Report_ObsoleteMessage (oa, iface_type.GetSignatureForError (), Location, Report);
1716
1717                                         if (iface_type.Arity > 0) {
1718                                                 // TODO: passing `this' is wrong, should be base type iface instead
1719                                                 TypeManager.CheckTypeVariance (iface_type, Variance.Covariant, this);
1720
1721                                                 if (((InflatedTypeSpec) iface_type).HasDynamicArgument () && !IsCompilerGenerated) {
1722                                                         Report.Error (1966, Location,
1723                                                                 "`{0}': cannot implement a dynamic interface `{1}'",
1724                                                                 GetSignatureForError (), iface_type.GetSignatureForError ());
1725                                                         return false;
1726                                                 }
1727                                         }
1728
1729                                         if (iface_type.IsGenericOrParentIsGeneric) {
1730                                                 if (spec.Interfaces != null) {
1731                                                         foreach (var prev_iface in iface_exprs) {
1732                                                                 if (prev_iface == iface_type)
1733                                                                         break;
1734
1735                                                                 if (!TypeSpecComparer.Unify.IsEqual (iface_type, prev_iface))
1736                                                                         continue;
1737
1738                                                                 Report.Error (695, Location,
1739                                                                         "`{0}' cannot implement both `{1}' and `{2}' because they may unify for some type parameter substitutions",
1740                                                                         GetSignatureForError (), prev_iface.GetSignatureForError (), iface_type.GetSignatureForError ());
1741                                                         }
1742                                                 }
1743                                         }
1744                                 }
1745                         }
1746
1747                         if (base_type != null) {
1748                                 //
1749                                 // Run checks skipped during DefineType (e.g FullNamedExpression::ResolveAsType)
1750                                 //
1751                                 if (base_type_expr != null) {
1752                                         ObsoleteAttribute obsolete_attr = base_type.GetAttributeObsolete ();
1753                                         if (obsolete_attr != null && !IsObsolete)
1754                                                 AttributeTester.Report_ObsoleteMessage (obsolete_attr, base_type.GetSignatureForError (), base_type_expr.Location, Report);
1755
1756                                         if (IsGenericOrParentIsGeneric && base_type.IsAttribute) {
1757                                                 Report.Error (698, base_type_expr.Location,
1758                                                         "A generic type cannot derive from `{0}' because it is an attribute class",
1759                                                         base_type.GetSignatureForError ());
1760                                         }
1761                                 }
1762
1763                                 if (base_type.Interfaces != null) {
1764                                         foreach (var iface in base_type.Interfaces)
1765                                                 spec.AddInterface (iface);
1766                                 }
1767
1768                                 var baseContainer = base_type.MemberDefinition as ClassOrStruct;
1769                                 if (baseContainer != null) {
1770                                         baseContainer.Define ();
1771
1772                                         //
1773                                         // It can trigger define of this type (for generic types only)
1774                                         //
1775                                         if (HasMembersDefined)
1776                                                 return true;
1777                                 }
1778                         }
1779
1780                         if (Kind == MemberKind.Struct || Kind == MemberKind.Class) {
1781                                 pending = PendingImplementation.GetPendingImplementations (this);
1782                         }
1783
1784                         var count = members.Count;
1785                         for (int i = 0; i < count; ++i) {
1786                                 var mc = members[i] as InterfaceMemberBase;
1787                                 if (mc == null || !mc.IsExplicitImpl)
1788                                         continue;
1789
1790                                 try {
1791                                         mc.Define ();
1792                                 } catch (Exception e) {
1793                                         throw new InternalErrorException (mc, e);
1794                                 }
1795                         }
1796
1797                         for (int i = 0; i < count; ++i) {
1798                                 var mc = members[i] as InterfaceMemberBase;
1799                                 if (mc != null && mc.IsExplicitImpl)
1800                                         continue;
1801
1802                                 if (members[i] is TypeContainer)
1803                                         continue;
1804
1805                                 try {
1806                                         members[i].Define ();
1807                                 } catch (Exception e) {
1808                                         throw new InternalErrorException (members[i], e);
1809                                 }
1810                         }
1811
1812                         if (HasOperators) {
1813                                 CheckPairedOperators ();
1814                         }
1815
1816                         if (requires_delayed_unmanagedtype_check) {
1817                                 requires_delayed_unmanagedtype_check = false;
1818                                 foreach (var member in members) {
1819                                         var f = member as Field;
1820                                         if (f != null && f.MemberType != null && f.MemberType.IsPointer)
1821                                                 TypeManager.VerifyUnmanaged (Module, f.MemberType, f.Location);
1822                                 }
1823                         }
1824
1825                         ComputeIndexerName();
1826
1827                         if (HasEquals && !HasGetHashCode) {
1828                                 Report.Warning (659, 3, Location,
1829                                         "`{0}' overrides Object.Equals(object) but does not override Object.GetHashCode()", GetSignatureForError ());
1830                         }
1831
1832                         if (Kind == MemberKind.Interface && iface_exprs != null) {
1833                                 MemberCache.RemoveHiddenMembers (spec);
1834                         }
1835
1836                         return true;
1837                 }
1838
1839                 void ComputeIndexerName ()
1840                 {
1841                         var indexers = MemberCache.FindMembers (spec, MemberCache.IndexerNameAlias, true);
1842                         if (indexers == null)
1843                                 return;
1844
1845                         string class_indexer_name = null;
1846
1847                         //
1848                         // Check normal indexers for consistent name, explicit interface implementation
1849                         // indexers are ignored
1850                         //
1851                         foreach (var indexer in indexers) {
1852                                 //
1853                                 // FindMembers can return unfiltered full hierarchy names
1854                                 //
1855                                 if (indexer.DeclaringType != spec)
1856                                         continue;
1857
1858                                 has_normal_indexers = true;
1859
1860                                 if (class_indexer_name == null) {
1861                                         indexer_name = class_indexer_name = indexer.Name;
1862                                         continue;
1863                                 }
1864
1865                                 if (indexer.Name != class_indexer_name)
1866                                         Report.Error (668, ((Indexer)indexer.MemberDefinition).Location,
1867                                                 "Two indexers have different names; the IndexerName attribute must be used with the same name on every indexer within a type");
1868                         }
1869                 }
1870
1871                 void EmitIndexerName ()
1872                 {
1873                         if (!has_normal_indexers)
1874                                 return;
1875
1876                         var ctor = Module.PredefinedMembers.DefaultMemberAttributeCtor.Get ();
1877                         if (ctor == null)
1878                                 return;
1879
1880                         var encoder = new AttributeEncoder ();
1881                         encoder.Encode (GetAttributeDefaultMember ());
1882                         encoder.EncodeEmptyNamedArguments ();
1883
1884                         TypeBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), encoder.ToArray ());
1885                 }
1886
1887                 public override void VerifyMembers ()
1888                 {
1889                         //
1890                         // Check for internal or private fields that were never assigned
1891                         //
1892                         if (!IsCompilerGenerated && Compiler.Settings.WarningLevel >= 3 && this == PartialContainer) {
1893                                 bool is_type_exposed = Kind == MemberKind.Struct || IsExposedFromAssembly ();
1894                                 foreach (var member in members) {
1895                                         if (member is Event) {
1896                                                 //
1897                                                 // An event can be assigned from same class only, so we can report
1898                                                 // this warning for all accessibility modes
1899                                                 //
1900                                                 if (!member.IsUsed)
1901                                                         Report.Warning (67, 3, member.Location, "The event `{0}' is never used", member.GetSignatureForError ());
1902
1903                                                 continue;
1904                                         }
1905
1906                                         if ((member.ModFlags & Modifiers.AccessibilityMask) != Modifiers.PRIVATE) {
1907                                                 if (is_type_exposed)
1908                                                         continue;
1909
1910                                                 member.SetIsUsed ();
1911                                         }
1912
1913                                         var f = member as Field;
1914                                         if (f == null)
1915                                                 continue;
1916
1917                                         if (!member.IsUsed) {
1918                                                 if ((member.caching_flags & Flags.IsAssigned) == 0) {
1919                                                         Report.Warning (169, 3, member.Location, "The private field `{0}' is never used", member.GetSignatureForError ());
1920                                                 } else {
1921                                                         Report.Warning (414, 3, member.Location, "The private field `{0}' is assigned but its value is never used",
1922                                                                 member.GetSignatureForError ());
1923                                                 }
1924                                                 continue;
1925                                         }
1926
1927                                         if ((f.caching_flags & Flags.IsAssigned) != 0)
1928                                                 continue;
1929
1930                                         //
1931                                         // Only report 649 on level 4
1932                                         //
1933                                         if (Compiler.Settings.WarningLevel < 4)
1934                                                 continue;
1935
1936                                         //
1937                                         // Don't be pedantic when type requires specific layout
1938                                         //
1939                                         if (f.OptAttributes != null || PartialContainer.HasStructLayout)
1940                                                 continue;
1941
1942                                         Constant c = New.Constantify (f.MemberType, f.Location);
1943                                         string value;
1944                                         if (c != null) {
1945                                                 value = c.GetValueAsLiteral ();
1946                                         } else if (TypeSpec.IsReferenceType (f.MemberType)) {
1947                                                 value = "null";
1948                                         } else {
1949                                                 value = null;
1950                                         }
1951
1952                                         if (value != null)
1953                                                 value = " `" + value + "'";
1954
1955                                         Report.Warning (649, 4, f.Location, "Field `{0}' is never assigned to, and will always have its default value{1}",
1956                                                 f.GetSignatureForError (), value);
1957                                 }
1958                         }
1959
1960                         base.VerifyMembers ();
1961                 }
1962
1963                 public override void Emit ()
1964                 {
1965                         if (OptAttributes != null)
1966                                 OptAttributes.Emit ();
1967
1968                         if (!IsCompilerGenerated) {
1969                                 if (!IsTopLevel) {
1970                                         MemberSpec candidate;
1971                                         bool overrides = false;
1972                                         var conflict_symbol = MemberCache.FindBaseMember (this, out candidate, ref overrides);
1973                                         if (conflict_symbol == null && candidate == null) {
1974                                                 if ((ModFlags & Modifiers.NEW) != 0)
1975                                                         Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required",
1976                                                                 GetSignatureForError ());
1977                                         } else {
1978                                                 if ((ModFlags & Modifiers.NEW) == 0) {
1979                                                         if (candidate == null)
1980                                                                 candidate = conflict_symbol;
1981
1982                                                         Report.SymbolRelatedToPreviousError (candidate);
1983                                                         Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended",
1984                                                                 GetSignatureForError (), candidate.GetSignatureForError ());
1985                                                 }
1986                                         }
1987                                 }
1988
1989                                 // Run constraints check on all possible generic types
1990                                 if (base_type != null && base_type_expr != null) {
1991                                         ConstraintChecker.Check (this, base_type, base_type_expr.Location);
1992                                 }
1993
1994                                 if (iface_exprs != null) {
1995                                         foreach (var iface_type in iface_exprs) {
1996                                                 if (iface_type == null)
1997                                                         continue;
1998
1999                                                 ConstraintChecker.Check (this, iface_type, Location);   // TODO: Location is wrong
2000                                         }
2001                                 }
2002                         }
2003
2004                         if (all_tp_builders != null) {
2005                                 int current_starts_index = CurrentTypeParametersStartIndex;
2006                                 for (int i = 0; i < all_tp_builders.Length; i++) {
2007                                         if (i < current_starts_index) {
2008                                                 all_type_parameters[i].EmitConstraints (all_tp_builders [i]);
2009                                         } else {
2010                                                 var tp = CurrentTypeParameters [i - current_starts_index];
2011                                                 tp.CheckGenericConstraints (!IsObsolete);
2012                                                 tp.Emit ();
2013                                         }
2014                                 }
2015                         }
2016
2017                         if ((ModFlags & Modifiers.COMPILER_GENERATED) != 0 && !Parent.IsCompilerGenerated)
2018                                 Module.PredefinedAttributes.CompilerGenerated.EmitAttribute (TypeBuilder);
2019
2020 #if STATIC
2021                         if ((TypeBuilder.Attributes & TypeAttributes.StringFormatMask) == 0 && Module.HasDefaultCharSet)
2022                                 TypeBuilder.__SetAttributes (TypeBuilder.Attributes | Module.DefaultCharSetType);
2023 #endif
2024
2025                         base.Emit ();
2026
2027                         for (int i = 0; i < members.Count; i++)
2028                                 members[i].Emit ();
2029
2030                         EmitIndexerName ();
2031                         CheckAttributeClsCompliance ();
2032
2033                         if (pending != null)
2034                                 pending.VerifyPendingMethods ();
2035                 }
2036
2037
2038                 void CheckAttributeClsCompliance ()
2039                 {
2040                         if (!spec.IsAttribute || !IsExposedFromAssembly () || !Compiler.Settings.VerifyClsCompliance || !IsClsComplianceRequired ())
2041                                 return;
2042
2043                         foreach (var m in members) {
2044                                 var c = m as Constructor;
2045                                 if (c == null)
2046                                         continue;
2047
2048                                 if (c.HasCompliantArgs)
2049                                         return;
2050                         }
2051
2052                         Report.Warning (3015, 1, Location, "`{0}' has no accessible constructors which use only CLS-compliant types", GetSignatureForError ());
2053                 }
2054
2055                 public sealed override void EmitContainer ()
2056                 {
2057                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
2058                                 return;
2059
2060                         Emit ();
2061                 }
2062
2063                 public override void CloseContainer ()
2064                 {
2065                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
2066                                 return;
2067
2068                         // Close base type container first to avoid TypeLoadException
2069                         if (spec.BaseType != null) {
2070                                 var btype = spec.BaseType.MemberDefinition as TypeContainer;
2071                                 if (btype != null) {
2072                                         btype.CloseContainer ();
2073
2074                                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
2075                                                 return;
2076                                 }
2077                         }
2078
2079                         try {
2080                                 caching_flags |= Flags.CloseTypeCreated;
2081                                 TypeBuilder.CreateType ();
2082                         } catch (TypeLoadException) {
2083                                 //
2084                                 // This is fine, the code still created the type
2085                                 //
2086                         } catch (Exception e) {
2087                                 throw new InternalErrorException (this, e);
2088                         }
2089
2090                         base.CloseContainer ();
2091
2092                         containers = null;
2093                         initialized_fields = null;
2094                         initialized_static_fields = null;
2095                         type_bases = null;
2096                         OptAttributes = null;
2097                 }
2098
2099                 //
2100                 // Performs the validation on a Method's modifiers (properties have
2101                 // the same properties).
2102                 //
2103                 // TODO: Why is it not done at parse stage, move to Modifiers::Check
2104                 //
2105                 public bool MethodModifiersValid (MemberCore mc)
2106                 {
2107                         const Modifiers vao = (Modifiers.VIRTUAL | Modifiers.ABSTRACT | Modifiers.OVERRIDE);
2108                         const Modifiers nv = (Modifiers.NEW | Modifiers.VIRTUAL);
2109                         bool ok = true;
2110                         var flags = mc.ModFlags;
2111
2112                         //
2113                         // At most one of static, virtual or override
2114                         //
2115                         if ((flags & Modifiers.STATIC) != 0){
2116                                 if ((flags & vao) != 0){
2117                                         Report.Error (112, mc.Location, "A static member `{0}' cannot be marked as override, virtual or abstract",
2118                                                 mc.GetSignatureForError ());
2119                                         ok = false;
2120                                 }
2121                         }
2122
2123                         if ((flags & Modifiers.OVERRIDE) != 0 && (flags & nv) != 0){
2124                                 Report.Error (113, mc.Location, "A member `{0}' marked as override cannot be marked as new or virtual",
2125                                         mc.GetSignatureForError ());
2126                                 ok = false;
2127                         }
2128
2129                         //
2130                         // If the declaration includes the abstract modifier, then the
2131                         // declaration does not include static, virtual or extern
2132                         //
2133                         if ((flags & Modifiers.ABSTRACT) != 0){
2134                                 if ((flags & Modifiers.EXTERN) != 0){
2135                                         Report.Error (
2136                                                 180, mc.Location, "`{0}' cannot be both extern and abstract", mc.GetSignatureForError ());
2137                                         ok = false;
2138                                 }
2139
2140                                 if ((flags & Modifiers.SEALED) != 0) {
2141                                         Report.Error (502, mc.Location, "`{0}' cannot be both abstract and sealed", mc.GetSignatureForError ());
2142                                         ok = false;
2143                                 }
2144
2145                                 if ((flags & Modifiers.VIRTUAL) != 0){
2146                                         Report.Error (503, mc.Location, "The abstract method `{0}' cannot be marked virtual", mc.GetSignatureForError ());
2147                                         ok = false;
2148                                 }
2149
2150                                 if ((ModFlags & Modifiers.ABSTRACT) == 0){
2151                                         Report.SymbolRelatedToPreviousError (this);
2152                                         Report.Error (513, mc.Location, "`{0}' is abstract but it is declared in the non-abstract class `{1}'",
2153                                                 mc.GetSignatureForError (), GetSignatureForError ());
2154                                         ok = false;
2155                                 }
2156                         }
2157
2158                         if ((flags & Modifiers.PRIVATE) != 0){
2159                                 if ((flags & vao) != 0){
2160                                         Report.Error (621, mc.Location, "`{0}': virtual or abstract members cannot be private", mc.GetSignatureForError ());
2161                                         ok = false;
2162                                 }
2163                         }
2164
2165                         if ((flags & Modifiers.SEALED) != 0){
2166                                 if ((flags & Modifiers.OVERRIDE) == 0){
2167                                         Report.Error (238, mc.Location, "`{0}' cannot be sealed because it is not an override", mc.GetSignatureForError ());
2168                                         ok = false;
2169                                 }
2170                         }
2171
2172                         return ok;
2173                 }
2174
2175                 protected override bool VerifyClsCompliance ()
2176                 {
2177                         if (!base.VerifyClsCompliance ())
2178                                 return false;
2179
2180                         // Check all container names for user classes
2181                         if (Kind != MemberKind.Delegate)
2182                                 MemberCache.VerifyClsCompliance (Definition, Report);
2183
2184                         if (BaseType != null && !BaseType.IsCLSCompliant ()) {
2185                                 Report.Warning (3009, 1, Location, "`{0}': base type `{1}' is not CLS-compliant",
2186                                         GetSignatureForError (), BaseType.GetSignatureForError ());
2187                         }
2188                         return true;
2189                 }
2190
2191                 /// <summary>
2192                 ///   Performs checks for an explicit interface implementation.  First it
2193                 ///   checks whether the `interface_type' is a base inteface implementation.
2194                 ///   Then it checks whether `name' exists in the interface type.
2195                 /// </summary>
2196                 public bool VerifyImplements (InterfaceMemberBase mb)
2197                 {
2198                         var ifaces = spec.Interfaces;
2199                         if (ifaces != null) {
2200                                 foreach (TypeSpec t in ifaces){
2201                                         if (t == mb.InterfaceType)
2202                                                 return true;
2203                                 }
2204                         }
2205
2206                         Report.SymbolRelatedToPreviousError (mb.InterfaceType);
2207                         Report.Error (540, mb.Location, "`{0}': containing type does not implement interface `{1}'",
2208                                 mb.GetSignatureForError (), TypeManager.CSharpName (mb.InterfaceType));
2209                         return false;
2210                 }
2211
2212                 //
2213                 // Used for visiblity checks to tests whether this definition shares
2214                 // base type baseType, it does member-definition search
2215                 //
2216                 public bool IsBaseTypeDefinition (TypeSpec baseType)
2217                 {
2218                         // RootContext check
2219                         if (TypeBuilder == null)
2220                                 return false;
2221
2222                         var type = spec;
2223                         do {
2224                                 if (type.MemberDefinition == baseType.MemberDefinition)
2225                                         return true;
2226
2227                                 type = type.BaseType;
2228                         } while (type != null);
2229
2230                         return false;
2231                 }
2232
2233                 public override bool IsClsComplianceRequired ()
2234                 {
2235                         if (IsPartialPart)
2236                                 return PartialContainer.IsClsComplianceRequired ();
2237
2238                         return base.IsClsComplianceRequired ();
2239                 }
2240
2241                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2242                 {
2243                         return Module.DeclaringAssembly == assembly;
2244                 }
2245
2246                 public virtual bool IsUnmanagedType ()
2247                 {
2248                         return false;
2249                 }
2250
2251                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2252                 {
2253                         throw new NotSupportedException ("Not supported for compiled definition " + GetSignatureForError ());
2254                 }
2255
2256                 //
2257                 // Public function used to locate types.
2258                 //
2259                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
2260                 //
2261                 // Returns: Type or null if they type can not be found.
2262                 //
2263                 public override FullNamedExpression LookupNamespaceOrType (string name, int arity, LookupMode mode, Location loc)
2264                 {
2265                         FullNamedExpression e;
2266                         if (arity == 0 && Cache.TryGetValue (name, out e) && mode != LookupMode.IgnoreAccessibility)
2267                                 return e;
2268
2269                         e = null;
2270
2271                         if (arity == 0) {
2272                                 var tp = CurrentTypeParameters;
2273                                 if (tp != null) {
2274                                         TypeParameter tparam = tp.Find (name);
2275                                         if (tparam != null)
2276                                                 e = new TypeParameterExpr (tparam, Location.Null);
2277                                 }
2278                         }
2279
2280                         if (e == null) {
2281                                 TypeSpec t = LookupNestedTypeInHierarchy (name, arity);
2282
2283                                 if (t != null && (t.IsAccessible (this) || mode == LookupMode.IgnoreAccessibility))
2284                                         e = new TypeExpression (t, Location.Null);
2285                                 else {
2286                                         e = Parent.LookupNamespaceOrType (name, arity, mode, loc);
2287                                 }
2288                         }
2289
2290                         // TODO MemberCache: How to cache arity stuff ?
2291                         if (arity == 0 && mode == LookupMode.Normal)
2292                                 Cache[name] = e;
2293
2294                         return e;
2295                 }
2296
2297                 TypeSpec LookupNestedTypeInHierarchy (string name, int arity)
2298                 {
2299                         // Has any nested type
2300                         // Does not work, because base type can have
2301                         //if (PartialContainer.Types == null)
2302                         //      return null;
2303
2304                         var container = PartialContainer.CurrentType;
2305                         return MemberCache.FindNestedType (container, name, arity);
2306                 }
2307
2308                 public void Mark_HasEquals ()
2309                 {
2310                         cached_method |= CachedMethods.Equals;
2311                 }
2312
2313                 public void Mark_HasGetHashCode ()
2314                 {
2315                         cached_method |= CachedMethods.GetHashCode;
2316                 }
2317
2318                 public override void WriteDebugSymbol (MonoSymbolFile file)
2319                 {
2320                         if (IsPartialPart)
2321                                 return;
2322
2323                         foreach (var m in members) {
2324                                 m.WriteDebugSymbol (file);
2325                         }
2326                 }
2327
2328                 /// <summary>
2329                 /// Method container contains Equals method
2330                 /// </summary>
2331                 public bool HasEquals {
2332                         get {
2333                                 return (cached_method & CachedMethods.Equals) != 0;
2334                         }
2335                 }
2336
2337                 /// <summary>
2338                 /// Method container contains GetHashCode method
2339                 /// </summary>
2340                 public bool HasGetHashCode {
2341                         get {
2342                                 return (cached_method & CachedMethods.GetHashCode) != 0;
2343                         }
2344                 }
2345
2346                 public bool HasStaticFieldInitializer {
2347                         get {
2348                                 return (cached_method & CachedMethods.HasStaticFieldInitializer) != 0;
2349                         }
2350                         set {
2351                                 if (value)
2352                                         cached_method |= CachedMethods.HasStaticFieldInitializer;
2353                                 else
2354                                         cached_method &= ~CachedMethods.HasStaticFieldInitializer;
2355                         }
2356                 }
2357
2358                 public override string DocCommentHeader {
2359                         get { return "T:"; }
2360                 }
2361         }
2362
2363         public abstract class ClassOrStruct : TypeDefinition
2364         {
2365                 public const TypeAttributes StaticClassAttribute = TypeAttributes.Abstract | TypeAttributes.Sealed;
2366
2367                 SecurityType declarative_security;
2368
2369                 public ClassOrStruct (TypeContainer parent, MemberName name, Attributes attrs, MemberKind kind)
2370                         : base (parent, name, attrs, kind)
2371                 {
2372                 }
2373
2374                 protected override TypeAttributes TypeAttr {
2375                         get {
2376                                 TypeAttributes ta = base.TypeAttr;
2377                                 if (!has_static_constructor)
2378                                         ta |= TypeAttributes.BeforeFieldInit;
2379
2380                                 if (Kind == MemberKind.Class) {
2381                                         ta |= TypeAttributes.AutoLayout | TypeAttributes.Class;
2382                                         if (IsStatic)
2383                                                 ta |= StaticClassAttribute;
2384                                 } else {
2385                                         ta |= TypeAttributes.SequentialLayout;
2386                                 }
2387
2388                                 return ta;
2389                         }
2390                 }
2391
2392                 public override void AddNameToContainer (MemberCore symbol, string name)
2393                 {
2394                         if (!(symbol is Constructor) && symbol.MemberName.Name == MemberName.Name) {
2395                                 if (symbol is TypeParameter) {
2396                                         Report.Error (694, symbol.Location,
2397                                                 "Type parameter `{0}' has same name as containing type, or method",
2398                                                 symbol.GetSignatureForError ());
2399                                         return;
2400                                 }
2401
2402                                 InterfaceMemberBase imb = symbol as InterfaceMemberBase;
2403                                 if (imb == null || !imb.IsExplicitImpl) {
2404                                         Report.SymbolRelatedToPreviousError (this);
2405                                         Report.Error (542, symbol.Location, "`{0}': member names cannot be the same as their enclosing type",
2406                                                 symbol.GetSignatureForError ());
2407                                         return;
2408                                 }
2409                         }
2410
2411                         base.AddNameToContainer (symbol, name);
2412                 }
2413
2414                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2415                 {
2416                         if (a.IsValidSecurityAttribute ()) {
2417                                 a.ExtractSecurityPermissionSet (ctor, ref declarative_security);
2418                                 return;
2419                         }
2420
2421                         if (a.Type == pa.StructLayout) {
2422                                 PartialContainer.HasStructLayout = true;
2423                                 if (a.IsExplicitLayoutKind ())
2424                                         PartialContainer.HasExplicitLayout = true;
2425                         }
2426
2427                         if (a.Type == pa.Dynamic) {
2428                                 a.Error_MisusedDynamicAttribute ();
2429                                 return;
2430                         }
2431
2432                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2433                 }
2434
2435                 /// <summary>
2436                 /// Defines the default constructors
2437                 /// </summary>
2438                 protected Constructor DefineDefaultConstructor (bool is_static)
2439                 {
2440                         // The default instance constructor is public
2441                         // If the class is abstract, the default constructor is protected
2442                         // The default static constructor is private
2443
2444                         Modifiers mods;
2445                         if (is_static) {
2446                                 mods = Modifiers.STATIC | Modifiers.PRIVATE;
2447                         } else {
2448                                 mods = ((ModFlags & Modifiers.ABSTRACT) != 0) ? Modifiers.PROTECTED : Modifiers.PUBLIC;
2449                         }
2450
2451                         var c = new Constructor (this, MemberName.Name, mods, null, ParametersCompiled.EmptyReadOnlyParameters, Location);
2452                         c.Initializer = new GeneratedBaseInitializer (Location);
2453
2454                         AddConstructor (c, true);
2455                         c.Block = new ToplevelBlock (Compiler, ParametersCompiled.EmptyReadOnlyParameters, Location) {
2456                                 IsCompilerGenerated = true
2457                         };
2458
2459                         return c;
2460                 }
2461
2462                 protected override bool DoDefineMembers ()
2463                 {
2464                         CheckProtectedModifier ();
2465
2466                         base.DoDefineMembers ();
2467
2468                         return true;
2469                 }
2470
2471                 public override void Emit ()
2472                 {
2473                         if (!has_static_constructor && HasStaticFieldInitializer) {
2474                                 var c = DefineDefaultConstructor (true);
2475                                 c.Define ();
2476                         }
2477
2478                         base.Emit ();
2479
2480                         if (declarative_security != null) {
2481                                 foreach (var de in declarative_security) {
2482 #if STATIC
2483                                         TypeBuilder.__AddDeclarativeSecurity (de);
2484 #else
2485                                         TypeBuilder.AddDeclarativeSecurity (de.Key, de.Value);
2486 #endif
2487                                 }
2488                         }
2489                 }
2490         }
2491
2492
2493         public sealed class Class : ClassOrStruct
2494         {
2495                 const Modifiers AllowedModifiers =
2496                         Modifiers.NEW |
2497                         Modifiers.PUBLIC |
2498                         Modifiers.PROTECTED |
2499                         Modifiers.INTERNAL |
2500                         Modifiers.PRIVATE |
2501                         Modifiers.ABSTRACT |
2502                         Modifiers.SEALED |
2503                         Modifiers.STATIC |
2504                         Modifiers.UNSAFE;
2505
2506                 public Class (TypeContainer parent, MemberName name, Modifiers mod, Attributes attrs)
2507                         : base (parent, name, attrs, MemberKind.Class)
2508                 {
2509                         var accmods = IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2510                         this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, Location, Report);
2511                         spec = new TypeSpec (Kind, null, this, null, ModFlags);
2512                 }
2513
2514                 public override void Accept (StructuralVisitor visitor)
2515                 {
2516                         visitor.Visit (this);
2517                 }
2518
2519                 public override void AddBasesForPart (List<FullNamedExpression> bases)
2520                 {
2521                         var pmn = MemberName;
2522                         if (pmn.Name == "Object" && !pmn.IsGeneric && Parent.MemberName.Name == "System" && Parent.MemberName.Left == null)
2523                                 Report.Error (537, Location,
2524                                         "The class System.Object cannot have a base class or implement an interface.");
2525
2526                         base.AddBasesForPart (bases);
2527                 }
2528
2529                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2530                 {
2531                         if (a.Type == pa.AttributeUsage) {
2532                                 if (!BaseType.IsAttribute && spec.BuiltinType != BuiltinTypeSpec.Type.Attribute) {
2533                                         Report.Error (641, a.Location, "Attribute `{0}' is only valid on classes derived from System.Attribute", a.GetSignatureForError ());
2534                                 }
2535                         }
2536
2537                         if (a.Type == pa.Conditional && !BaseType.IsAttribute) {
2538                                 Report.Error (1689, a.Location, "Attribute `System.Diagnostics.ConditionalAttribute' is only valid on methods or attribute classes");
2539                                 return;
2540                         }
2541
2542                         if (a.Type == pa.ComImport && !attributes.Contains (pa.Guid)) {
2543                                 a.Error_MissingGuidAttribute ();
2544                                 return;
2545                         }
2546
2547                         if (a.Type == pa.Extension) {
2548                                 a.Error_MisusedExtensionAttribute ();
2549                                 return;
2550                         }
2551
2552                         if (a.Type.IsConditionallyExcluded (this, Location))
2553                                 return;
2554
2555                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2556                 }
2557
2558                 public override AttributeTargets AttributeTargets {
2559                         get {
2560                                 return AttributeTargets.Class;
2561                         }
2562                 }
2563
2564                 protected override bool DoDefineMembers ()
2565                 {
2566                         if ((ModFlags & Modifiers.ABSTRACT) == Modifiers.ABSTRACT && (ModFlags & (Modifiers.SEALED | Modifiers.STATIC)) != 0) {
2567                                 Report.Error (418, Location, "`{0}': an abstract class cannot be sealed or static", GetSignatureForError ());
2568                         }
2569
2570                         if ((ModFlags & (Modifiers.SEALED | Modifiers.STATIC)) == (Modifiers.SEALED | Modifiers.STATIC)) {
2571                                 Report.Error (441, Location, "`{0}': a class cannot be both static and sealed", GetSignatureForError ());
2572                         }
2573
2574                         if (IsStatic) {
2575                                 foreach (var m in Members) {
2576                                         if (m is Operator) {
2577                                                 Report.Error (715, m.Location, "`{0}': Static classes cannot contain user-defined operators", m.GetSignatureForError ());
2578                                                 continue;
2579                                         }
2580
2581                                         if (m is Destructor) {
2582                                                 Report.Error (711, m.Location, "`{0}': Static classes cannot contain destructor", GetSignatureForError ());
2583                                                 continue;
2584                                         }
2585
2586                                         if (m is Indexer) {
2587                                                 Report.Error (720, m.Location, "`{0}': cannot declare indexers in a static class", m.GetSignatureForError ());
2588                                                 continue;
2589                                         }
2590
2591                                         if ((m.ModFlags & Modifiers.STATIC) != 0 || m is TypeContainer)
2592                                                 continue;
2593
2594                                         if (m is Constructor) {
2595                                                 Report.Error (710, m.Location, "`{0}': Static classes cannot have instance constructors", GetSignatureForError ());
2596                                                 continue;
2597                                         }
2598
2599                                         Report.Error (708, m.Location, "`{0}': cannot declare instance members in a static class", m.GetSignatureForError ());
2600                                 }
2601                         } else {
2602                                 if (!PartialContainer.HasInstanceConstructor)
2603                                         DefineDefaultConstructor (false);
2604                         }
2605
2606                         return base.DoDefineMembers ();
2607                 }
2608
2609                 public override void Emit ()
2610                 {
2611                         base.Emit ();
2612
2613                         if ((ModFlags & Modifiers.METHOD_EXTENSION) != 0)
2614                                 Module.PredefinedAttributes.Extension.EmitAttribute (TypeBuilder);
2615
2616                         if (base_type != null && base_type.HasDynamicElement) {
2617                                 Module.PredefinedAttributes.Dynamic.EmitAttribute (TypeBuilder, base_type, Location);
2618                         }
2619                 }
2620
2621                 protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
2622                 {
2623                         var ifaces = base.ResolveBaseTypes (out base_class);
2624
2625                         if (base_class == null) {
2626                                 if (spec.BuiltinType != BuiltinTypeSpec.Type.Object)
2627                                         base_type = Compiler.BuiltinTypes.Object;
2628                         } else {
2629                                 if (base_type.IsGenericParameter){
2630                                         Report.Error (689, base_class.Location, "`{0}': Cannot derive from type parameter `{1}'",
2631                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2632                                 } else if (base_type.IsStatic) {
2633                                         Report.SymbolRelatedToPreviousError (base_type);
2634                                         Report.Error (709, Location, "`{0}': Cannot derive from static class `{1}'",
2635                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2636                                 } else if (base_type.IsSealed) {
2637                                         Report.SymbolRelatedToPreviousError (base_type);
2638                                         Report.Error (509, Location, "`{0}': cannot derive from sealed type `{1}'",
2639                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2640                                 } else if (PartialContainer.IsStatic && base_type.BuiltinType != BuiltinTypeSpec.Type.Object) {
2641                                         Report.Error (713, Location, "Static class `{0}' cannot derive from type `{1}'. Static classes must derive from object",
2642                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2643                                 }
2644
2645                                 switch (base_type.BuiltinType) {
2646                                 case BuiltinTypeSpec.Type.Enum:
2647                                 case BuiltinTypeSpec.Type.ValueType:
2648                                 case BuiltinTypeSpec.Type.MulticastDelegate:
2649                                 case BuiltinTypeSpec.Type.Delegate:
2650                                 case BuiltinTypeSpec.Type.Array:
2651                                         if (!(spec is BuiltinTypeSpec)) {
2652                                                 Report.Error (644, Location, "`{0}' cannot derive from special class `{1}'",
2653                                                         GetSignatureForError (), base_type.GetSignatureForError ());
2654
2655                                                 base_type = Compiler.BuiltinTypes.Object;
2656                                         }
2657                                         break;
2658                                 }
2659
2660                                 if (!IsAccessibleAs (base_type)) {
2661                                         Report.SymbolRelatedToPreviousError (base_type);
2662                                         Report.Error (60, Location, "Inconsistent accessibility: base class `{0}' is less accessible than class `{1}'",
2663                                                 base_type.GetSignatureForError (), GetSignatureForError ());
2664                                 }
2665                         }
2666
2667                         if (PartialContainer.IsStatic && ifaces != null) {
2668                                 foreach (var t in ifaces)
2669                                         Report.SymbolRelatedToPreviousError (t);
2670                                 Report.Error (714, Location, "Static class `{0}' cannot implement interfaces", GetSignatureForError ());
2671                         }
2672
2673                         return ifaces;
2674                 }
2675
2676                 /// Search for at least one defined condition in ConditionalAttribute of attribute class
2677                 /// Valid only for attribute classes.
2678                 public override string[] ConditionalConditions ()
2679                 {
2680                         if ((caching_flags & (Flags.Excluded_Undetected | Flags.Excluded)) == 0)
2681                                 return null;
2682
2683                         caching_flags &= ~Flags.Excluded_Undetected;
2684
2685                         if (OptAttributes == null)
2686                                 return null;
2687
2688                         Attribute[] attrs = OptAttributes.SearchMulti (Module.PredefinedAttributes.Conditional);
2689                         if (attrs == null)
2690                                 return null;
2691
2692                         string[] conditions = new string[attrs.Length];
2693                         for (int i = 0; i < conditions.Length; ++i)
2694                                 conditions[i] = attrs[i].GetConditionalAttributeValue ();
2695
2696                         caching_flags |= Flags.Excluded;
2697                         return conditions;
2698                 }
2699         }
2700
2701         public sealed class Struct : ClassOrStruct
2702         {
2703                 bool is_unmanaged, has_unmanaged_check_done;
2704                 bool InTransit;
2705
2706                 // <summary>
2707                 //   Modifiers allowed in a struct declaration
2708                 // </summary>
2709                 const Modifiers AllowedModifiers =
2710                         Modifiers.NEW       |
2711                         Modifiers.PUBLIC    |
2712                         Modifiers.PROTECTED |
2713                         Modifiers.INTERNAL  |
2714                         Modifiers.UNSAFE    |
2715                         Modifiers.PRIVATE;
2716
2717                 public Struct (TypeContainer parent, MemberName name, Modifiers mod, Attributes attrs)
2718                         : base (parent, name, attrs, MemberKind.Struct)
2719                 {
2720                         var accmods = IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2721                         this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, Location, Report) | Modifiers.SEALED ;
2722                         spec = new TypeSpec (Kind, null, this, null, ModFlags);
2723                 }
2724
2725                 public override AttributeTargets AttributeTargets {
2726                         get {
2727                                 return AttributeTargets.Struct;
2728                         }
2729                 }
2730
2731                 public override void Accept (StructuralVisitor visitor)
2732                 {
2733                         visitor.Visit (this);
2734                 }
2735
2736                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2737                 {
2738                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2739
2740                         //
2741                         // When struct constains fixed fixed and struct layout has explicitly
2742                         // set CharSet, its value has to be propagated to compiler generated
2743                         // fixed types
2744                         //
2745                         if (a.Type == pa.StructLayout) {
2746                                 var value = a.GetNamedValue ("CharSet");
2747                                 if (value == null)
2748                                         return;
2749
2750                                 for (int i = 0; i < Members.Count; ++i) {
2751                                         FixedField ff = Members [i] as FixedField;
2752                                         if (ff == null)
2753                                                 continue;
2754
2755                                         ff.CharSet = (CharSet) System.Enum.Parse (typeof (CharSet), value.GetValue ().ToString ());
2756                                 }
2757                         }
2758                 }
2759
2760                 bool CheckStructCycles ()
2761                 {
2762                         if (InTransit)
2763                                 return false;
2764
2765                         InTransit = true;
2766                         foreach (var member in Members) {
2767                                 var field = member as Field;
2768                                 if (field == null)
2769                                         continue;
2770
2771                                 TypeSpec ftype = field.Spec.MemberType;
2772                                 if (!ftype.IsStruct)
2773                                         continue;
2774
2775                                 if (ftype is BuiltinTypeSpec)
2776                                         continue;
2777
2778                                 foreach (var targ in ftype.TypeArguments) {
2779                                         if (!CheckFieldTypeCycle (targ)) {
2780                                                 Report.Error (523, field.Location,
2781                                                         "Struct member `{0}' of type `{1}' causes a cycle in the struct layout",
2782                                                         field.GetSignatureForError (), ftype.GetSignatureForError ());
2783                                                 break;
2784                                         }
2785                                 }
2786
2787                                 //
2788                                 // Static fields of exactly same type are allowed
2789                                 //
2790                                 if (field.IsStatic && ftype == CurrentType)
2791                                         continue;
2792
2793                                 if (!CheckFieldTypeCycle (ftype)) {
2794                                         Report.Error (523, field.Location,
2795                                                 "Struct member `{0}' of type `{1}' causes a cycle in the struct layout",
2796                                                 field.GetSignatureForError (), ftype.GetSignatureForError ());
2797                                         break;
2798                                 }
2799                         }
2800
2801                         InTransit = false;
2802                         return true;
2803                 }
2804
2805                 static bool CheckFieldTypeCycle (TypeSpec ts)
2806                 {
2807                         var fts = ts.MemberDefinition as Struct;
2808                         if (fts == null)
2809                                 return true;
2810
2811                         return fts.CheckStructCycles ();
2812                 }
2813
2814                 public override void Emit ()
2815                 {
2816                         CheckStructCycles ();
2817
2818                         base.Emit ();
2819                 }
2820
2821                 public override bool IsUnmanagedType ()
2822                 {
2823                         if (has_unmanaged_check_done)
2824                                 return is_unmanaged;
2825
2826                         if (requires_delayed_unmanagedtype_check)
2827                                 return true;
2828
2829                         var parent_def = Parent.PartialContainer;
2830                         if (parent_def != null && parent_def.IsGenericOrParentIsGeneric) {
2831                                 has_unmanaged_check_done = true;
2832                                 return false;
2833                         }
2834
2835                         if (first_nonstatic_field != null) {
2836                                 requires_delayed_unmanagedtype_check = true;
2837
2838                                 foreach (var member in Members) {
2839                                         var f = member as Field;
2840                                         if (f == null)
2841                                                 continue;
2842
2843                                         if (f.IsStatic)
2844                                                 continue;
2845
2846                                         // It can happen when recursive unmanaged types are defined
2847                                         // struct S { S* s; }
2848                                         TypeSpec mt = f.MemberType;
2849                                         if (mt == null) {
2850                                                 return true;
2851                                         }
2852
2853                                         if (mt.IsUnmanaged)
2854                                                 continue;
2855
2856                                         has_unmanaged_check_done = true;
2857                                         return false;
2858                                 }
2859
2860                                 has_unmanaged_check_done = true;
2861                         }
2862
2863                         is_unmanaged = true;
2864                         return true;
2865                 }
2866
2867                 protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
2868                 {
2869                         var ifaces = base.ResolveBaseTypes (out base_class);
2870                         base_type = Compiler.BuiltinTypes.ValueType;
2871                         return ifaces;
2872                 }
2873
2874                 public override void RegisterFieldForInitialization (MemberCore field, FieldInitializer expression)
2875                 {
2876                         if ((field.ModFlags & Modifiers.STATIC) == 0) {
2877                                 Report.Error (573, field.Location, "`{0}': Structs cannot have instance field initializers",
2878                                         field.GetSignatureForError ());
2879                                 return;
2880                         }
2881                         base.RegisterFieldForInitialization (field, expression);
2882                 }
2883
2884         }
2885
2886         /// <summary>
2887         ///   Interfaces
2888         /// </summary>
2889         public sealed class Interface : TypeDefinition {
2890
2891                 /// <summary>
2892                 ///   Modifiers allowed in a class declaration
2893                 /// </summary>
2894                 const Modifiers AllowedModifiers =
2895                         Modifiers.NEW       |
2896                         Modifiers.PUBLIC    |
2897                         Modifiers.PROTECTED |
2898                         Modifiers.INTERNAL  |
2899                         Modifiers.UNSAFE    |
2900                         Modifiers.PRIVATE;
2901
2902                 public Interface (TypeContainer parent, MemberName name, Modifiers mod, Attributes attrs)
2903                         : base (parent, name, attrs, MemberKind.Interface)
2904                 {
2905                         var accmods = IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2906
2907                         this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, name.Location, Report);
2908                         spec = new TypeSpec (Kind, null, this, null, ModFlags);
2909                 }
2910
2911                 #region Properties
2912
2913                 public override AttributeTargets AttributeTargets {
2914                         get {
2915                                 return AttributeTargets.Interface;
2916                         }
2917                 }
2918
2919                 protected override TypeAttributes TypeAttr {
2920                         get {
2921                                 const TypeAttributes DefaultTypeAttributes =
2922                                         TypeAttributes.AutoLayout |
2923                                         TypeAttributes.Abstract |
2924                                         TypeAttributes.Interface;
2925
2926                                 return base.TypeAttr | DefaultTypeAttributes;
2927                         }
2928                 }
2929
2930                 #endregion
2931
2932                 public override void Accept (StructuralVisitor visitor)
2933                 {
2934                         visitor.Visit (this);
2935                 }
2936
2937                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2938                 {
2939                         if (a.Type == pa.ComImport && !attributes.Contains (pa.Guid)) {
2940                                 a.Error_MissingGuidAttribute ();
2941                                 return;
2942                         }
2943
2944                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2945                 }
2946
2947                 protected override bool VerifyClsCompliance ()
2948                 {
2949                         if (!base.VerifyClsCompliance ())
2950                                 return false;
2951
2952                         if (iface_exprs != null) {
2953                                 foreach (var iface in iface_exprs) {
2954                                         if (iface.IsCLSCompliant ())
2955                                                 continue;
2956
2957                                         Report.SymbolRelatedToPreviousError (iface);
2958                                         Report.Warning (3027, 1, Location, "`{0}' is not CLS-compliant because base interface `{1}' is not CLS-compliant",
2959                                                 GetSignatureForError (), TypeManager.CSharpName (iface));
2960                                 }
2961                         }
2962
2963                         return true;
2964                 }
2965         }
2966
2967         public abstract class InterfaceMemberBase : MemberBase
2968         {
2969                 //
2970                 // Common modifiers allowed in a class declaration
2971                 //
2972                 protected const Modifiers AllowedModifiersClass =
2973                         Modifiers.NEW |
2974                         Modifiers.PUBLIC |
2975                         Modifiers.PROTECTED |
2976                         Modifiers.INTERNAL |
2977                         Modifiers.PRIVATE |
2978                         Modifiers.STATIC |
2979                         Modifiers.VIRTUAL |
2980                         Modifiers.SEALED |
2981                         Modifiers.OVERRIDE |
2982                         Modifiers.ABSTRACT |
2983                         Modifiers.UNSAFE |
2984                         Modifiers.EXTERN;
2985
2986                 //
2987                 // Common modifiers allowed in a struct declaration
2988                 //
2989                 protected const Modifiers AllowedModifiersStruct =
2990                         Modifiers.NEW |
2991                         Modifiers.PUBLIC |
2992                         Modifiers.PROTECTED |
2993                         Modifiers.INTERNAL |
2994                         Modifiers.PRIVATE |
2995                         Modifiers.STATIC |
2996                         Modifiers.OVERRIDE |
2997                         Modifiers.UNSAFE |
2998                         Modifiers.EXTERN;
2999
3000                 //
3001                 // Common modifiers allowed in a interface declaration
3002                 //
3003                 protected const Modifiers AllowedModifiersInterface =
3004                         Modifiers.NEW |
3005                         Modifiers.UNSAFE;
3006
3007                 //
3008                 // Whether this is an interface member.
3009                 //
3010                 public bool IsInterface;
3011
3012                 //
3013                 // If true, this is an explicit interface implementation
3014                 //
3015                 public readonly bool IsExplicitImpl;
3016
3017                 protected bool is_external_implementation;
3018
3019                 //
3020                 // The interface type we are explicitly implementing
3021                 //
3022                 public TypeSpec InterfaceType;
3023
3024                 //
3025                 // The method we're overriding if this is an override method.
3026                 //
3027                 protected MethodSpec base_method;
3028
3029                 readonly Modifiers explicit_mod_flags;
3030                 public MethodAttributes flags;
3031
3032                 public InterfaceMemberBase (TypeDefinition parent, FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, MemberName name, Attributes attrs)
3033                         : base (parent, type, mod, allowed_mod, Modifiers.PRIVATE, name, attrs)
3034                 {
3035                         IsInterface = parent.Kind == MemberKind.Interface;
3036                         IsExplicitImpl = (MemberName.ExplicitInterface != null);
3037                         explicit_mod_flags = mod;
3038                 }
3039
3040                 public abstract Variance ExpectedMemberTypeVariance { get; }
3041
3042                 protected override bool CheckBase ()
3043                 {
3044                         if (!base.CheckBase ())
3045                                 return false;
3046
3047                         if ((caching_flags & Flags.MethodOverloadsExist) != 0)
3048                                 CheckForDuplications ();
3049
3050                         if (IsExplicitImpl)
3051                                 return true;
3052
3053                         // For System.Object only
3054                         if (Parent.BaseType == null)
3055                                 return true;
3056
3057                         MemberSpec candidate;
3058                         bool overrides = false;
3059                         var base_member = FindBaseMember (out candidate, ref overrides);
3060
3061                         if ((ModFlags & Modifiers.OVERRIDE) != 0) {
3062                                 if (base_member == null) {
3063                                         if (candidate == null) {
3064                                                 if (this is Method && ((Method)this).ParameterInfo.IsEmpty && MemberName.Name == Destructor.MetadataName && MemberName.Arity == 0) {
3065                                                         Report.Error (249, Location, "Do not override `{0}'. Use destructor syntax instead",
3066                                                                 "object.Finalize()");
3067                                                 } else {
3068                                                         Report.Error (115, Location, "`{0}' is marked as an override but no suitable {1} found to override",
3069                                                                 GetSignatureForError (), SimpleName.GetMemberType (this));
3070                                                 }
3071                                         } else {
3072                                                 Report.SymbolRelatedToPreviousError (candidate);
3073                                                 if (this is Event)
3074                                                         Report.Error (72, Location, "`{0}': cannot override because `{1}' is not an event",
3075                                                                 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
3076                                                 else if (this is PropertyBase)
3077                                                         Report.Error (544, Location, "`{0}': cannot override because `{1}' is not a property",
3078                                                                 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
3079                                                 else
3080                                                         Report.Error (505, Location, "`{0}': cannot override because `{1}' is not a method",
3081                                                                 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
3082                                         }
3083
3084                                         return false;
3085                                 }
3086
3087                                 //
3088                                 // Handles ambiguous overrides
3089                                 //
3090                                 if (candidate != null) {
3091                                         Report.SymbolRelatedToPreviousError (candidate);
3092                                         Report.SymbolRelatedToPreviousError (base_member);
3093
3094                                         // Get member definition for error reporting
3095                                         var m1 = MemberCache.GetMember (base_member.DeclaringType.GetDefinition (), base_member);
3096                                         var m2 = MemberCache.GetMember (candidate.DeclaringType.GetDefinition (), candidate);
3097
3098                                         Report.Error (462, Location,
3099                                                 "`{0}' cannot override inherited members `{1}' and `{2}' because they have the same signature when used in type `{3}'",
3100                                                 GetSignatureForError (), m1.GetSignatureForError (), m2.GetSignatureForError (), Parent.GetSignatureForError ());
3101                                 }
3102
3103                                 if (!CheckOverrideAgainstBase (base_member))
3104                                         return false;
3105
3106                                 ObsoleteAttribute oa = base_member.GetAttributeObsolete ();
3107                                 if (oa != null) {
3108                                         if (OptAttributes == null || !OptAttributes.Contains (Module.PredefinedAttributes.Obsolete)) {
3109                                                 Report.SymbolRelatedToPreviousError (base_member);
3110                                                 Report.Warning (672, 1, Location, "Member `{0}' overrides obsolete member `{1}'. Add the Obsolete attribute to `{0}'",
3111                                                         GetSignatureForError (), base_member.GetSignatureForError ());
3112                                         }
3113                                 } else {
3114                                         if (OptAttributes != null && OptAttributes.Contains (Module.PredefinedAttributes.Obsolete)) {
3115                                                 Report.SymbolRelatedToPreviousError (base_member);
3116                                                 Report.Warning (809, 1, Location, "Obsolete member `{0}' overrides non-obsolete member `{1}'",
3117                                                         GetSignatureForError (), base_member.GetSignatureForError ());
3118                                         }
3119                                 }
3120
3121                                 base_method = base_member as MethodSpec;
3122                                 return true;
3123                         }
3124
3125                         if (base_member == null && candidate != null && (!(candidate is IParametersMember) || !(this is IParametersMember)))
3126                                 base_member = candidate;
3127
3128                         if (base_member == null) {
3129                                 if ((ModFlags & Modifiers.NEW) != 0) {
3130                                         if (base_member == null) {
3131                                                 Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required",
3132                                                         GetSignatureForError ());
3133                                         }
3134                                 }
3135                         } else {
3136                                 if ((ModFlags & Modifiers.NEW) == 0) {
3137                                         ModFlags |= Modifiers.NEW;
3138                                         if (!IsCompilerGenerated) {
3139                                                 Report.SymbolRelatedToPreviousError (base_member);
3140                                                 if (!IsInterface && (base_member.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE)) != 0) {
3141                                                         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",
3142                                                                 GetSignatureForError (), base_member.GetSignatureForError ());
3143                                                 } else {
3144                                                         Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended",
3145                                                                 GetSignatureForError (), base_member.GetSignatureForError ());
3146                                                 }
3147                                         }
3148                                 }
3149
3150                                 if (!IsInterface && base_member.IsAbstract && !overrides) {
3151                                         Report.SymbolRelatedToPreviousError (base_member);
3152                                         Report.Error (533, Location, "`{0}' hides inherited abstract member `{1}'",
3153                                                 GetSignatureForError (), base_member.GetSignatureForError ());
3154                                 }
3155                         }
3156
3157                         return true;
3158                 }
3159
3160                 protected virtual bool CheckForDuplications ()
3161                 {
3162                         return Parent.MemberCache.CheckExistingMembersOverloads (this, ParametersCompiled.EmptyReadOnlyParameters);
3163                 }
3164
3165                 //
3166                 // Performs various checks on the MethodInfo `mb' regarding the modifier flags
3167                 // that have been defined.
3168                 //
3169                 protected virtual bool CheckOverrideAgainstBase (MemberSpec base_member)
3170                 {
3171                         bool ok = true;
3172
3173                         if ((base_member.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE)) == 0) {
3174                                 Report.SymbolRelatedToPreviousError (base_member);
3175                                 Report.Error (506, Location,
3176                                         "`{0}': cannot override inherited member `{1}' because it is not marked virtual, abstract or override",
3177                                          GetSignatureForError (), TypeManager.CSharpSignature (base_member));
3178                                 ok = false;
3179                         }
3180
3181                         // Now we check that the overriden method is not final
3182                         if ((base_member.Modifiers & Modifiers.SEALED) != 0) {
3183                                 Report.SymbolRelatedToPreviousError (base_member);
3184                                 Report.Error (239, Location, "`{0}': cannot override inherited member `{1}' because it is sealed",
3185                                                           GetSignatureForError (), TypeManager.CSharpSignature (base_member));
3186                                 ok = false;
3187                         }
3188
3189                         var base_member_type = ((IInterfaceMemberSpec) base_member).MemberType;
3190                         if (!TypeSpecComparer.Override.IsEqual (MemberType, base_member_type)) {
3191                                 Report.SymbolRelatedToPreviousError (base_member);
3192                                 if (this is PropertyBasedMember) {
3193                                         Report.Error (1715, Location, "`{0}': type must be `{1}' to match overridden member `{2}'",
3194                                                 GetSignatureForError (), TypeManager.CSharpName (base_member_type), TypeManager.CSharpSignature (base_member));
3195                                 } else {
3196                                         Report.Error (508, Location, "`{0}': return type must be `{1}' to match overridden member `{2}'",
3197                                                 GetSignatureForError (), TypeManager.CSharpName (base_member_type), TypeManager.CSharpSignature (base_member));
3198                                 }
3199                                 ok = false;
3200                         }
3201
3202                         return ok;
3203                 }
3204
3205                 protected static bool CheckAccessModifiers (MemberCore this_member, MemberSpec base_member)
3206                 {
3207                         var thisp = this_member.ModFlags & Modifiers.AccessibilityMask;
3208                         var base_classp = base_member.Modifiers & Modifiers.AccessibilityMask;
3209
3210                         if ((base_classp & (Modifiers.PROTECTED | Modifiers.INTERNAL)) == (Modifiers.PROTECTED | Modifiers.INTERNAL)) {
3211                                 //
3212                                 // It must be at least "protected"
3213                                 //
3214                                 if ((thisp & Modifiers.PROTECTED) == 0) {
3215                                         return false;
3216                                 }
3217
3218                                 //
3219                                 // when overriding protected internal, the method can be declared
3220                                 // protected internal only within the same assembly or assembly
3221                                 // which has InternalsVisibleTo
3222                                 //
3223                                 if ((thisp & Modifiers.INTERNAL) != 0) {
3224                                         return base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (this_member.Module.DeclaringAssembly);
3225                                 }
3226
3227                                 //
3228                                 // protected overriding protected internal inside same assembly
3229                                 // requires internal modifier as well
3230                                 //
3231                                 if (base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (this_member.Module.DeclaringAssembly)) {
3232                                         return false;
3233                                 }
3234
3235                                 return true;
3236                         }
3237
3238                         return thisp == base_classp;
3239                 }
3240
3241                 public override bool Define ()
3242                 {
3243                         if (IsInterface) {
3244                                 ModFlags = Modifiers.PUBLIC | Modifiers.ABSTRACT |
3245                                         Modifiers.VIRTUAL | (ModFlags & (Modifiers.UNSAFE | Modifiers.NEW));
3246
3247                                 flags = MethodAttributes.Public |
3248                                         MethodAttributes.Abstract |
3249                                         MethodAttributes.HideBySig |
3250                                         MethodAttributes.NewSlot |
3251                                         MethodAttributes.Virtual;
3252                         } else {
3253                                 Parent.PartialContainer.MethodModifiersValid (this);
3254
3255                                 flags = ModifiersExtensions.MethodAttr (ModFlags);
3256                         }
3257
3258                         if (IsExplicitImpl) {
3259                                 InterfaceType = MemberName.ExplicitInterface.ResolveAsType (Parent);
3260                                 if (InterfaceType == null)
3261                                         return false;
3262
3263                                 if ((ModFlags & Modifiers.PARTIAL) != 0) {
3264                                         Report.Error (754, Location, "A partial method `{0}' cannot explicitly implement an interface",
3265                                                 GetSignatureForError ());
3266                                 }
3267
3268                                 if (!InterfaceType.IsInterface) {
3269                                         Report.SymbolRelatedToPreviousError (InterfaceType);
3270                                         Report.Error (538, Location, "The type `{0}' in explicit interface declaration is not an interface",
3271                                                 TypeManager.CSharpName (InterfaceType));
3272                                 } else {
3273                                         Parent.PartialContainer.VerifyImplements (this);
3274                                 }
3275
3276                                 ModifiersExtensions.Check (Modifiers.AllowedExplicitImplFlags, explicit_mod_flags, 0, Location, Report);
3277                         }
3278
3279                         return base.Define ();
3280                 }
3281
3282                 protected bool DefineParameters (ParametersCompiled parameters)
3283                 {
3284                         if (!parameters.Resolve (this))
3285                                 return false;
3286
3287                         bool error = false;
3288                         for (int i = 0; i < parameters.Count; ++i) {
3289                                 Parameter p = parameters [i];
3290
3291                                 if (p.HasDefaultValue && (IsExplicitImpl || this is Operator || (this is Indexer && parameters.Count == 1)))
3292                                         p.Warning_UselessOptionalParameter (Report);
3293
3294                                 if (p.CheckAccessibility (this))
3295                                         continue;
3296
3297                                 TypeSpec t = parameters.Types [i];
3298                                 Report.SymbolRelatedToPreviousError (t);
3299                                 if (this is Indexer)
3300                                         Report.Error (55, Location,
3301                                                       "Inconsistent accessibility: parameter type `{0}' is less accessible than indexer `{1}'",
3302                                                       TypeManager.CSharpName (t), GetSignatureForError ());
3303                                 else if (this is Operator)
3304                                         Report.Error (57, Location,
3305                                                       "Inconsistent accessibility: parameter type `{0}' is less accessible than operator `{1}'",
3306                                                       TypeManager.CSharpName (t), GetSignatureForError ());
3307                                 else
3308                                         Report.Error (51, Location,
3309                                                 "Inconsistent accessibility: parameter type `{0}' is less accessible than method `{1}'",
3310                                                 TypeManager.CSharpName (t), GetSignatureForError ());
3311                                 error = true;
3312                         }
3313                         return !error;
3314                 }
3315
3316                 protected override void DoMemberTypeDependentChecks ()
3317                 {
3318                         base.DoMemberTypeDependentChecks ();
3319
3320                         TypeManager.CheckTypeVariance (MemberType, ExpectedMemberTypeVariance, this);
3321                 }
3322
3323                 public override void Emit()
3324                 {
3325                         // for extern static method must be specified either DllImport attribute or MethodImplAttribute.
3326                         // We are more strict than csc and report this as an error because SRE does not allow emit that
3327                         if ((ModFlags & Modifiers.EXTERN) != 0 && !is_external_implementation && (OptAttributes == null || !OptAttributes.HasResolveError ())) {
3328                                 if (this is Constructor) {
3329                                         Report.Warning (824, 1, Location,
3330                                                 "Constructor `{0}' is marked `external' but has no external implementation specified", GetSignatureForError ());
3331                                 } else {
3332                                         Report.Warning (626, 1, Location,
3333                                                 "`{0}' is marked as an external but has no DllImport attribute. Consider adding a DllImport attribute to specify the external implementation",
3334                                                 GetSignatureForError ());
3335                                 }
3336                         }
3337
3338                         base.Emit ();
3339                 }
3340
3341                 public override bool EnableOverloadChecks (MemberCore overload)
3342                 {
3343                         //
3344                         // Two members can differ in their explicit interface
3345                         // type parameter only
3346                         //
3347                         InterfaceMemberBase imb = overload as InterfaceMemberBase;
3348                         if (imb != null && imb.IsExplicitImpl) {
3349                                 if (IsExplicitImpl) {
3350                                         caching_flags |= Flags.MethodOverloadsExist;
3351                                 }
3352                                 return true;
3353                         }
3354
3355                         return IsExplicitImpl;
3356                 }
3357
3358                 protected void Error_CannotChangeAccessModifiers (MemberCore member, MemberSpec base_member)
3359                 {
3360                         var base_modifiers = base_member.Modifiers;
3361
3362                         // Remove internal modifier from types which are not internally accessible
3363                         if ((base_modifiers & Modifiers.AccessibilityMask) == (Modifiers.PROTECTED | Modifiers.INTERNAL) &&
3364                                 !base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (member.Module.DeclaringAssembly))
3365                                 base_modifiers = Modifiers.PROTECTED;
3366
3367                         Report.SymbolRelatedToPreviousError (base_member);
3368                         Report.Error (507, member.Location,
3369                                 "`{0}': cannot change access modifiers when overriding `{1}' inherited member `{2}'",
3370                                 member.GetSignatureForError (),
3371                                 ModifiersExtensions.AccessibilityName (base_modifiers),
3372                                 base_member.GetSignatureForError ());
3373                 }
3374
3375                 protected void Error_StaticReturnType ()
3376                 {
3377                         Report.Error (722, Location,
3378                                 "`{0}': static types cannot be used as return types",
3379                                 MemberType.GetSignatureForError ());
3380                 }
3381
3382                 /// <summary>
3383                 /// Gets base method and its return type
3384                 /// </summary>
3385                 protected virtual MemberSpec FindBaseMember (out MemberSpec bestCandidate, ref bool overrides)
3386                 {
3387                         return MemberCache.FindBaseMember (this, out bestCandidate, ref overrides);
3388                 }
3389
3390                 //
3391                 // The "short" name of this property / indexer / event.  This is the
3392                 // name without the explicit interface.
3393                 //
3394                 public string ShortName {
3395                         get { return MemberName.Name; }
3396                 }
3397
3398                 //
3399                 // Returns full metadata method name
3400                 //
3401                 public string GetFullName (MemberName name)
3402                 {
3403                         return GetFullName (name.Name);
3404                 }
3405
3406                 public string GetFullName (string name)
3407                 {
3408                         if (!IsExplicitImpl)
3409                                 return name;
3410
3411                         //
3412                         // When dealing with explicit members a full interface type
3413                         // name is added to member name to avoid possible name conflicts
3414                         //
3415                         // We use CSharpName which gets us full name with benefit of
3416                         // replacing predefined names which saves some space and name
3417                         // is still unique
3418                         //
3419                         return TypeManager.CSharpName (InterfaceType) + "." + name;
3420                 }
3421
3422                 public override string GetSignatureForDocumentation ()
3423                 {
3424                         if (IsExplicitImpl)
3425                                 return Parent.GetSignatureForDocumentation () + "." + InterfaceType.GetExplicitNameSignatureForDocumentation () + "#" + ShortName;
3426
3427                         return Parent.GetSignatureForDocumentation () + "." + ShortName;
3428                 }
3429
3430                 public override bool IsUsed
3431                 {
3432                         get { return IsExplicitImpl || base.IsUsed; }
3433                 }
3434
3435                 public override void SetConstraints (List<Constraints> constraints_list)
3436                 {
3437                         if (((ModFlags & Modifiers.OVERRIDE) != 0 || IsExplicitImpl)) {
3438                                 Report.Error (460, Location,
3439                                         "`{0}': Cannot specify constraints for overrides and explicit interface implementation methods",
3440                                         GetSignatureForError ());
3441                         }
3442
3443                         base.SetConstraints (constraints_list);
3444                 }
3445         }
3446
3447         public abstract class MemberBase : MemberCore
3448         {
3449                 protected FullNamedExpression type_expr;
3450                 protected TypeSpec member_type;
3451                 public new TypeDefinition Parent;
3452
3453                 protected MemberBase (TypeDefinition parent, FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, Modifiers def_mod, MemberName name, Attributes attrs)
3454                         : base (parent, name, attrs)
3455                 {
3456                         this.Parent = parent;
3457                         this.type_expr = type;
3458                         ModFlags = ModifiersExtensions.Check (allowed_mod, mod, def_mod, Location, Report);
3459                 }
3460
3461                 #region Properties
3462
3463                 public TypeSpec MemberType {
3464                         get {
3465                                 return member_type;
3466                         }
3467                 }
3468
3469                 public FullNamedExpression TypeExpression {
3470                         get {
3471                                 return type_expr;
3472                         }
3473                 }
3474
3475                 #endregion
3476
3477                 //
3478                 // Main member define entry
3479                 //
3480                 public override bool Define ()
3481                 {
3482                         DoMemberTypeIndependentChecks ();
3483
3484                         //
3485                         // Returns false only when type resolution failed
3486                         //
3487                         if (!ResolveMemberType ())
3488                                 return false;
3489
3490                         DoMemberTypeDependentChecks ();
3491                         return true;
3492                 }
3493
3494                 //
3495                 // Any type_name independent checks
3496                 //
3497                 protected virtual void DoMemberTypeIndependentChecks ()
3498                 {
3499                         if ((Parent.ModFlags & Modifiers.SEALED) != 0 &&
3500                                 (ModFlags & (Modifiers.VIRTUAL | Modifiers.ABSTRACT)) != 0) {
3501                                 Report.Error (549, Location, "New virtual member `{0}' is declared in a sealed class `{1}'",
3502                                         GetSignatureForError (), Parent.GetSignatureForError ());
3503                         }
3504                 }
3505
3506                 //
3507                 // Any type_name dependent checks
3508                 //
3509                 protected virtual void DoMemberTypeDependentChecks ()
3510                 {
3511                         // verify accessibility
3512                         if (!IsAccessibleAs (MemberType)) {
3513                                 Report.SymbolRelatedToPreviousError (MemberType);
3514                                 if (this is Property)
3515                                         Report.Error (53, Location,
3516                                                       "Inconsistent accessibility: property type `" +
3517                                                       TypeManager.CSharpName (MemberType) + "' is less " +
3518                                                       "accessible than property `" + GetSignatureForError () + "'");
3519                                 else if (this is Indexer)
3520                                         Report.Error (54, Location,
3521                                                       "Inconsistent accessibility: indexer return type `" +
3522                                                       TypeManager.CSharpName (MemberType) + "' is less " +
3523                                                       "accessible than indexer `" + GetSignatureForError () + "'");
3524                                 else if (this is MethodCore) {
3525                                         if (this is Operator)
3526                                                 Report.Error (56, Location,
3527                                                               "Inconsistent accessibility: return type `" +
3528                                                               TypeManager.CSharpName (MemberType) + "' is less " +
3529                                                               "accessible than operator `" + GetSignatureForError () + "'");
3530                                         else
3531                                                 Report.Error (50, Location,
3532                                                               "Inconsistent accessibility: return type `" +
3533                                                               TypeManager.CSharpName (MemberType) + "' is less " +
3534                                                               "accessible than method `" + GetSignatureForError () + "'");
3535                                 } else {
3536                                         Report.Error (52, Location,
3537                                                       "Inconsistent accessibility: field type `" +
3538                                                       TypeManager.CSharpName (MemberType) + "' is less " +
3539                                                       "accessible than field `" + GetSignatureForError () + "'");
3540                                 }
3541                         }
3542                 }
3543
3544                 protected void IsTypePermitted ()
3545                 {
3546                         if (MemberType.IsSpecialRuntimeType) {
3547                                 if (Parent is StateMachine) {
3548                                         Report.Error (4012, Location,
3549                                                 "Parameters or local variables of type `{0}' cannot be declared in async methods or iterators",
3550                                                 MemberType.GetSignatureForError ());
3551                                 } else if (Parent is HoistedStoreyClass) {
3552                                         Report.Error (4013, Location,
3553                                                 "Local variables of type `{0}' cannot be used inside anonymous methods, lambda expressions or query expressions",
3554                                                 MemberType.GetSignatureForError ());
3555                                 } else {
3556                                         Report.Error (610, Location,
3557                                                 "Field or property cannot be of type `{0}'", MemberType.GetSignatureForError ());
3558                                 }
3559                         }
3560                 }
3561
3562                 protected virtual bool CheckBase ()
3563                 {
3564                         CheckProtectedModifier ();
3565
3566                         return true;
3567                 }
3568
3569                 public override string GetSignatureForDocumentation ()
3570                 {
3571                         return Parent.GetSignatureForDocumentation () + "." + MemberName.Basename;
3572                 }
3573
3574                 protected virtual bool ResolveMemberType ()
3575                 {
3576                         if (member_type != null)
3577                                 throw new InternalErrorException ("Multi-resolve");
3578
3579                         member_type = type_expr.ResolveAsType (this);
3580                         return member_type != null;
3581                 }
3582         }
3583 }
3584