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.Linq;
  17 using System.Collections.Generic;
  18 using System.Runtime.InteropServices;
  19 using System.Security;
  20 using System.Security.Permissions;
  21 using System.Text;
  22 using System.Diagnostics;
  23 using Mono.CompilerServices.SymbolWriter;
  24
  25 #if MOBILE
  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
  48                 protected List<TypeContainer> containers;
  49
  50                 TypeDefinition main_container;
  51
  52                 protected Dictionary<string, MemberCore> defined_names;
  53
  54                 protected bool is_defined;
  55
  56                 public int CounterAnonymousMethods { get; set; }
  57                 public int CounterAnonymousContainers { get; set; }
  58                 public int CounterSwitchTypes { get; set; }
  59
  60                 protected TypeContainer (TypeContainer parent, MemberName name, Attributes attrs, MemberKind kind)
  61                         : base (parent, name, attrs)
  62                 {
  63                         this.Kind = kind;
  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. Used
  96                 // by FULL_AST mode
  97                 //
  98                 public Attributes UnattachedAttributes {
  99                         get; set;
 100                 }
 101
 102                 public void AddCompilerGeneratedClass (CompilerGeneratedContainer c)
 103                 {
 104                         AddTypeContainerMember (c);
 105                 }
 106
 107                 public virtual void AddPartial (TypeDefinition next_part)
 108                 {
 109                         MemberCore mc;
 110                         (PartialContainer ?? this).defined_names.TryGetValue (next_part.MemberName.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_MODIFIER) == 0 &&
 144                                  (next_part.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFIER) == 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_MODIFIER) != 0) {
 172                                 existing.ModFlags |= next_part.ModFlags & ~(Modifiers.DEFAULT_ACCESS_MODIFIER | Modifiers.AccessibilityMask);
 173                         } else if ((existing.ModFlags & Modifiers.DEFAULT_ACCESS_MODIFIER) != 0) {
 174                                 existing.ModFlags &= ~(Modifiers.DEFAULT_ACCESS_MODIFIER | 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                         existing.AddPartialPart (next_part);
 192
 193                         AddTypeContainerMember (next_part);
 194                 }
 195
 196                 public virtual void AddTypeContainer (TypeContainer tc)
 197                 {
 198                         AddTypeContainerMember (tc);
 199
 200                         var tparams = tc.MemberName.TypeParameters;
 201                         if (tparams != null && tc.PartialContainer != null) {
 202                                 var td = (TypeDefinition) tc;
 203                                 for (int i = 0; i < tparams.Count; ++i) {
 204                                         var tp = tparams[i];
 205                                         if (tp.MemberName == null)
 206                                                 continue;
 207
 208                                         td.AddNameToContainer (tp, tp.Name);
 209                                 }
 210                         }
 211                 }
 212
 213                 protected virtual void AddTypeContainerMember (TypeContainer tc)
 214                 {
 215                         containers.Add (tc);
 216                 }
 217
 218                 public virtual void CloseContainer ()
 219                 {
 220                         if (containers != null) {
 221                                 foreach (TypeContainer tc in containers) {
 222                                         tc.CloseContainer ();
 223                                 }
 224                         }
 225                 }
 226
 227                 public virtual void CreateMetadataName (StringBuilder sb)
 228                 {
 229                         if (Parent != null && Parent.MemberName != null)
 230                                 Parent.CreateMetadataName (sb);
 231
 232                         MemberName.CreateMetadataName (sb);
 233                 }
 234
 235                 public virtual bool CreateContainer ()
 236                 {
 237                         if (containers != null) {
 238                                 foreach (TypeContainer tc in containers) {
 239                                         tc.CreateContainer ();
 240                                 }
 241                         }
 242
 243                         return true;
 244                 }
 245
 246                 public override bool Define ()
 247                 {
 248                         if (containers != null) {
 249                                 foreach (TypeContainer tc in containers) {
 250                                         tc.Define ();
 251                                 }
 252                         }
 253
 254                         // Release cache used by parser only
 255                         if (Module.Evaluator == null) {
 256                                 defined_names = null;
 257                         } else {
 258                                 defined_names.Clear ();
 259                         }
 260
 261                         return true;
 262                 }
 263
 264                 public virtual void PrepareEmit ()
 265                 {
 266                         if (containers != null) {
 267                                 foreach (var t in containers) {
 268                                         try {
 269                                                 t.PrepareEmit ();
 270                                         } catch (Exception e) {
 271                                                 if (MemberName == MemberName.Null)
 272                                                         throw;
 273
 274                                                 throw new InternalErrorException (t, e);
 275                                         }
 276                                 }
 277                         }
 278                 }
 279
 280                 public virtual bool DefineContainer ()
 281                 {
 282                         if (is_defined)
 283                                 return true;
 284
 285                         is_defined = true;
 286
 287                         DoDefineContainer ();
 288
 289                         if (containers != null) {
 290                                 foreach (TypeContainer tc in containers) {
 291                                         try {
 292                                                 tc.DefineContainer ();
 293                                         } catch (Exception e) {
 294                                                 if (MemberName == MemberName.Null)
 295                                                         throw;
 296
 297                                                 throw new InternalErrorException (tc, e);
 298                                         }
 299                                 }
 300
 301                                 if (PartialContainer != null && PartialContainer != this) {
 302                                         containers = null;
 303                                 }
 304                         }
 305
 306                         return true;
 307                 }
 308
 309                 public virtual void ExpandBaseInterfaces ()
 310                 {
 311                         if (containers != null) {
 312                                 foreach (TypeContainer tc in containers) {
 313                                         tc.ExpandBaseInterfaces ();
 314                                 }
 315                         }
 316                 }
 317
 318                 protected virtual void DefineNamespace ()
 319                 {
 320                         if (containers != null) {
 321                                 foreach (var tc in containers) {
 322                                         try {
 323                                                 tc.DefineNamespace ();
 324                                         } catch (Exception e) {
 325                                                 throw new InternalErrorException (tc, e);
 326                                         }
 327                                 }
 328                         }
 329                 }
 330
 331                 protected virtual void DoDefineContainer ()
 332                 {
 333                 }
 334
 335                 public virtual void EmitContainer ()
 336                 {
 337                         if (containers != null) {
 338                                 for (int i = 0; i < containers.Count; ++i)
 339                                         containers[i].EmitContainer ();
 340                         }
 341                 }
 342
 343                 protected void Error_MissingPartialModifier (MemberCore type)
 344                 {
 345                         Report.Error (260, type.Location,
 346                                 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
 347                                 type.GetSignatureForError ());
 348                 }
 349
 350                 public override string GetSignatureForDocumentation ()
 351                 {
 352                         if (Parent != null && Parent.MemberName != null)
 353                                 return Parent.GetSignatureForDocumentation () + "." + MemberName.GetSignatureForDocumentation ();
 354
 355                         return MemberName.GetSignatureForDocumentation ();
 356                 }
 357
 358                 public override string GetSignatureForError ()
 359                 {
 360                         if (Parent != null && Parent.MemberName != null)
 361                                 return Parent.GetSignatureForError () + "." + MemberName.GetSignatureForError ();
 362
 363                         return MemberName.GetSignatureForError ();
 364                 }
 365
 366                 public virtual string GetSignatureForMetadata ()
 367                 {
 368                         var sb = new StringBuilder ();
 369                         CreateMetadataName (sb);
 370                         return sb.ToString ();
 371                 }
 372
 373                 public virtual void RemoveContainer (TypeContainer cont)
 374                 {
 375                         if (containers != null)
 376                                 containers.Remove (cont);
 377
 378                         var tc = Parent == Module ? Module : this;
 379                         tc.defined_names.Remove (cont.MemberName.Basename);
 380                 }
 381
 382                 public virtual void VerifyMembers ()
 383                 {
 384                         if (containers != null) {
 385                                 foreach (TypeContainer tc in containers)
 386                                         tc.VerifyMembers ();
 387                         }
 388                 }
 389
 390                 public override void WriteDebugSymbol (MonoSymbolFile file)
 391                 {
 392                         if (containers != null) {
 393                                 foreach (TypeContainer tc in containers) {
 394                                         tc.WriteDebugSymbol (file);
 395                                 }
 396                         }
 397                 }
 398         }
 399
 400         public abstract class TypeDefinition : TypeContainer, ITypeDefinition
 401         {
 402                 //
 403                 // Different context is needed when resolving type container base
 404                 // types. Type names come from the parent scope but type parameter
 405                 // names from the container scope.
 406                 //
 407                 public struct BaseContext : IMemberContext
 408                 {
 409                         TypeContainer tc;
 410
 411                         public BaseContext (TypeContainer tc)
 412                         {
 413                                 this.tc = tc;
 414                         }
 415
 416                         #region IMemberContext Members
 417
 418                         public CompilerContext Compiler {
 419                                 get { return tc.Compiler; }
 420                         }
 421
 422                         public TypeSpec CurrentType {
 423                                 get { return tc.PartialContainer.CurrentType; }
 424                         }
 425
 426                         public TypeParameters CurrentTypeParameters {
 427                                 get { return tc.PartialContainer.CurrentTypeParameters; }
 428                         }
 429
 430                         public MemberCore CurrentMemberDefinition {
 431                                 get { return tc; }
 432                         }
 433
 434                         public bool IsObsolete {
 435                                 get { return tc.IsObsolete; }
 436                         }
 437
 438                         public bool IsUnsafe {
 439                                 get { return tc.IsUnsafe; }
 440                         }
 441
 442                         public bool IsStatic {
 443                                 get { return tc.IsStatic; }
 444                         }
 445
 446                         public ModuleContainer Module {
 447                                 get { return tc.Module; }
 448                         }
 449
 450                         public string GetSignatureForError ()
 451                         {
 452                                 return tc.GetSignatureForError ();
 453                         }
 454
 455                         public ExtensionMethodCandidates LookupExtensionMethod (string name, int arity)
 456                         {
 457                                 return null;
 458                         }
 459
 460                         public FullNamedExpression LookupNamespaceAlias (string name)
 461                         {
 462                                 return tc.Parent.LookupNamespaceAlias (name);
 463                         }
 464
 465                         public FullNamedExpression LookupNamespaceOrType (string name, int arity, LookupMode mode, Location loc)
 466                         {
 467                                 if (arity == 0) {
 468                                         var tp = CurrentTypeParameters;
 469                                         if (tp != null) {
 470                                                 TypeParameter t = tp.Find (name);
 471                                                 if (t != null)
 472                                                         return new TypeParameterExpr (t, loc);
 473                                         }
 474                                 }
 475
 476                                 return tc.Parent.LookupNamespaceOrType (name, arity, mode, loc);
 477                         }
 478
 479                         #endregion
 480                 }
 481
 482                 [Flags]
 483                 enum CachedMethods
 484                 {
 485                         Equals                          = 1,
 486                         GetHashCode                     = 1 << 1,
 487                         HasStaticFieldInitializer       = 1 << 2
 488                 }
 489
 490                 readonly List<MemberCore> members;
 491
 492                 // Holds a list of fields that have initializers
 493                 protected List<FieldInitializer> initialized_fields;
 494
 495                 // Holds a list of static fields that have initializers
 496                 protected List<FieldInitializer> initialized_static_fields;
 497
 498                 Dictionary<MethodSpec, Method> hoisted_base_call_proxies;
 499
 500                 Dictionary<string, FullNamedExpression> Cache = new Dictionary<string, FullNamedExpression> ();
 501
 502                 //
 503                 // Points to the first non-static field added to the container.
 504                 //
 505                 // This is an arbitrary choice.  We are interested in looking at _some_ non-static field,
 506                 // and the first one's as good as any.
 507                 //
 508                 protected FieldBase first_nonstatic_field;
 509
 510                 //
 511                 // This one is computed after we can distinguish interfaces
 512                 // from classes from the arraylist `type_bases'
 513                 //
 514                 protected TypeSpec base_type;
 515                 FullNamedExpression base_type_expr;     // TODO: It's temporary variable
 516                 protected TypeSpec[] iface_exprs;
 517
 518                 protected List<FullNamedExpression> type_bases;
 519
 520                 // Partial parts for classes only
 521                 List<TypeDefinition> class_partial_parts;
 522
 523                 TypeDefinition InTransit;
 524
 525                 public TypeBuilder TypeBuilder;
 526                 GenericTypeParameterBuilder[] all_tp_builders;
 527                 //
 528                 // All recursive type parameters put together sharing same
 529                 // TypeParameter instances
 530                 //
 531                 TypeParameters all_type_parameters;
 532
 533                 public const string DefaultIndexerName = "Item";
 534
 535                 bool has_normal_indexers;
 536                 string indexer_name;
 537                 bool error;
 538                 bool members_defined;
 539                 bool members_defined_ok;
 540                 protected bool has_static_constructor;
 541
 542                 private CachedMethods cached_method;
 543
 544                 protected TypeSpec spec;
 545                 TypeSpec current_type;
 546
 547                 public int DynamicSitesCounter;
 548                 public int AnonymousMethodsCounter;
 549                 public int MethodGroupsCounter;
 550
 551                 static readonly string[] attribute_targets = new [] { "type" };
 552                 static readonly string[] attribute_targets_primary = new [] { "type", "method" };
 553
 554                 /// <remarks>
 555                 ///  The pending methods that need to be implemented
 556                 //   (interfaces or abstract methods)
 557                 /// </remarks>
 558                 PendingImplementation pending;
 559
 560                 protected TypeDefinition (TypeContainer parent, MemberName name, Attributes attrs, MemberKind kind)
 561                         : base (parent, name, attrs, kind)
 562                 {
 563                         PartialContainer = this;
 564                         members = new List<MemberCore> ();
 565                 }
 566
 567                 #region Properties
 568
 569                 public List<FullNamedExpression> BaseTypeExpressions {
 570                         get {
 571                                 return type_bases;
 572                         }
 573                 }
 574
 575                 public override TypeSpec CurrentType {
 576                         get {
 577                                 if (current_type == null) {
 578                                         if (IsGenericOrParentIsGeneric) {
 579                                                 //
 580                                                 // Switch to inflated version as it's used by all expressions
 581                                                 //
 582                                                 var targs = CurrentTypeParameters == null ? TypeSpec.EmptyTypes : CurrentTypeParameters.Types;
 583                                                 current_type = spec.MakeGenericType (this, targs);
 584                                         } else {
 585                                                 current_type = spec;
 586                                         }
 587                                 }
 588
 589                                 return current_type;
 590                         }
 591                 }
 592
 593                 public override TypeParameters CurrentTypeParameters {
 594                         get {
 595                                 return PartialContainer.MemberName.TypeParameters;
 596                         }
 597                 }
 598
 599                 int CurrentTypeParametersStartIndex {
 600                         get {
 601                                 int total = all_tp_builders.Length;
 602                                 if (CurrentTypeParameters != null) {
 603                                         return total - CurrentTypeParameters.Count;
 604                                 }
 605                                 return total;
 606                         }
 607                 }
 608
 609                 public virtual AssemblyDefinition DeclaringAssembly {
 610                         get {
 611                                 return Module.DeclaringAssembly;
 612                         }
 613                 }
 614
 615                 IAssemblyDefinition ITypeDefinition.DeclaringAssembly {
 616                         get {
 617                                 return Module.DeclaringAssembly;
 618                         }
 619                 }
 620
 621                 public TypeSpec Definition {
 622                         get {
 623                                 return spec;
 624                         }
 625                 }
 626
 627                 public bool HasMembersDefined {
 628                         get {
 629                                 return members_defined;
 630                         }
 631                 }
 632
 633                 public bool HasInstanceConstructor {
 634                         get {
 635                                 return (caching_flags & Flags.HasInstanceConstructor) != 0;
 636                         }
 637                         set {
 638                                 caching_flags |= Flags.HasInstanceConstructor;
 639                         }
 640                 }
 641
 642                 // Indicated whether container has StructLayout attribute set Explicit
 643                 public bool HasExplicitLayout {
 644                         get { return (caching_flags & Flags.HasExplicitLayout) != 0; }
 645                         set { caching_flags |= Flags.HasExplicitLayout; }
 646                 }
 647
 648                 public bool HasOperators {
 649                         get {
 650                                 return (caching_flags & Flags.HasUserOperators) != 0;
 651                         }
 652                         set {
 653                                 caching_flags |= Flags.HasUserOperators;
 654                         }
 655                 }
 656
 657                 public bool HasStructLayout {
 658                         get { return (caching_flags & Flags.HasStructLayout) != 0; }
 659                         set { caching_flags |= Flags.HasStructLayout; }
 660                 }
 661
 662                 public TypeSpec[] Interfaces {
 663                         get {
 664                                 return iface_exprs;
 665                         }
 666                 }
 667
 668                 public bool IsGenericOrParentIsGeneric {
 669                         get {
 670                                 return all_type_parameters != null;
 671                         }
 672                 }
 673
 674                 public bool IsTopLevel {
 675                         get {
 676                                 return !(Parent is TypeDefinition);
 677                         }
 678                 }
 679
 680                 public bool IsPartial {
 681                         get {
 682                                 return (ModFlags & Modifiers.PARTIAL) != 0;
 683                         }
 684                 }
 685
 686                 bool ITypeDefinition.IsTypeForwarder {
 687                         get {
 688                                 return false;
 689                         }
 690                 }
 691
 692                 bool ITypeDefinition.IsCyclicTypeForwarder {
 693                         get {
 694                                 return false;
 695                         }
 696                 }
 697
 698                 //
 699                 // Returns true for secondary partial containers
 700                 //
 701                 bool IsPartialPart {
 702                         get {
 703                                 return PartialContainer != this;
 704                         }
 705                 }
 706
 707                 public MemberCache MemberCache {
 708                         get {
 709                                 return spec.MemberCache;
 710                         }
 711                 }
 712
 713                 public List<MemberCore> Members {
 714                         get {
 715                                 return members;
 716                         }
 717                 }
 718
 719                 string ITypeDefinition.Namespace {
 720                         get {
 721                                 var p = Parent;
 722                                 while (p.Kind != MemberKind.Namespace)
 723                                         p = p.Parent;
 724
 725                                 return p.MemberName == null ? null : p.GetSignatureForError ();
 726                         }
 727                 }
 728
 729                 public ParametersCompiled PrimaryConstructorParameters { get; set; }
 730
 731                 public Arguments PrimaryConstructorBaseArguments { get; set; }
 732
 733                 public Location PrimaryConstructorBaseArgumentsStart { get; set; }
 734
 735                 public TypeParameters TypeParametersAll {
 736                         get {
 737                                 return all_type_parameters;
 738                         }
 739                 }
 740
 741                 public override string[] ValidAttributeTargets {
 742                         get {
 743                                 return PrimaryConstructorParameters != null ? attribute_targets_primary : attribute_targets;
 744                         }
 745                 }
 746
 747                 #endregion
 748
 749                 public override void Accept (StructuralVisitor visitor)
 750                 {
 751                         visitor.Visit (this);
 752                 }
 753
 754                 public void AddMember (MemberCore symbol)
 755                 {
 756                         if (symbol.MemberName.ExplicitInterface != null) {
 757                                 if (!(Kind == MemberKind.Class || Kind == MemberKind.Struct)) {
 758                                         Report.Error (541, symbol.Location,
 759                                                 "`{0}': explicit interface declaration can only be declared in a class or struct",
 760                                                 symbol.GetSignatureForError ());
 761                                 }
 762                         }
 763
 764                         AddNameToContainer (symbol, symbol.MemberName.Name);
 765                         members.Add (symbol);
 766                 }
 767
 768                 public override void AddTypeContainer (TypeContainer tc)
 769                 {
 770                         AddNameToContainer (tc, tc.MemberName.Basename);
 771
 772                         base.AddTypeContainer (tc);
 773                 }
 774
 775                 protected override void AddTypeContainerMember (TypeContainer tc)
 776                 {
 777                         members.Add (tc);
 778
 779                         if (containers == null)
 780                                 containers = new List<TypeContainer> ();
 781
 782                         base.AddTypeContainerMember (tc);
 783                 }
 784
 785                 //
 786                 // Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 787                 //
 788                 public virtual void AddNameToContainer (MemberCore symbol, string name)
 789                 {
 790                         if (((ModFlags | symbol.ModFlags) & Modifiers.COMPILER_GENERATED) != 0)
 791                                 return;
 792
 793                         MemberCore mc;
 794                         if (!PartialContainer.defined_names.TryGetValue (name, out mc)) {
 795                                 PartialContainer.defined_names.Add (name, symbol);
 796                                 return;
 797                         }
 798
 799                         if (symbol.EnableOverloadChecks (mc))
 800                                 return;
 801
 802                         InterfaceMemberBase im = mc as InterfaceMemberBase;
 803                         if (im != null && im.IsExplicitImpl)
 804                                 return;
 805
 806                         Report.SymbolRelatedToPreviousError (mc);
 807                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
 808                                 Error_MissingPartialModifier (symbol);
 809                                 return;
 810                         }
 811
 812                         if (symbol is TypeParameter) {
 813                                 Report.Error (692, symbol.Location,
 814                                         "Duplicate type parameter `{0}'", symbol.GetSignatureForError ());
 815                         } else {
 816                                 Report.Error (102, symbol.Location,
 817                                         "The type `{0}' already contains a definition for `{1}'",
 818                                         GetSignatureForError (), name);
 819                         }
 820
 821                         return;
 822                 }
 823
 824                 public void AddConstructor (Constructor c)
 825                 {
 826                         AddConstructor (c, false);
 827                 }
 828
 829                 public void AddConstructor (Constructor c, bool isDefault)
 830                 {
 831                         bool is_static = (c.ModFlags & Modifiers.STATIC) != 0;
 832                         if (!isDefault)
 833                                 AddNameToContainer (c, is_static ? Constructor.TypeConstructorName : Constructor.ConstructorName);
 834
 835                         if (is_static && c.ParameterInfo.IsEmpty) {
 836                                 PartialContainer.has_static_constructor = true;
 837                         } else {
 838                                 PartialContainer.HasInstanceConstructor = true;
 839                         }
 840
 841                         members.Add (c);
 842                 }
 843
 844                 public bool AddField (FieldBase field)
 845                 {
 846                         AddMember (field);
 847
 848                         if ((field.ModFlags & Modifiers.STATIC) != 0)
 849                                 return true;
 850
 851                         var first_field = PartialContainer.first_nonstatic_field;
 852                         if (first_field == null) {
 853                                 PartialContainer.first_nonstatic_field = field;
 854                                 return true;
 855                         }
 856
 857                         if (Kind == MemberKind.Struct && first_field.Parent != field.Parent) {
 858                                 Report.SymbolRelatedToPreviousError (first_field.Parent);
 859                                 Report.Warning (282, 3, field.Location,
 860                                         "struct instance field `{0}' found in different declaration from instance field `{1}'",
 861                                         field.GetSignatureForError (), first_field.GetSignatureForError ());
 862                         }
 863                         return true;
 864                 }
 865
 866                 /// <summary>
 867                 /// Indexer has special handling in constrast to other AddXXX because the name can be driven by IndexerNameAttribute
 868                 /// </summary>
 869                 public void AddIndexer (Indexer i)
 870                 {
 871                         members.Add (i);
 872                 }
 873
 874                 public void AddOperator (Operator op)
 875                 {
 876                         PartialContainer.HasOperators = true;
 877                         AddMember (op);
 878                 }
 879
 880                 public void AddPartialPart (TypeDefinition part)
 881                 {
 882                         if (Kind != MemberKind.Class)
 883                                 return;
 884
 885                         if (class_partial_parts == null)
 886                                 class_partial_parts = new List<TypeDefinition> ();
 887
 888                         class_partial_parts.Add (part);
 889                 }
 890
 891                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
 892                 {
 893                         if (a.Target == AttributeTargets.Method) {
 894                                 foreach (var m in members) {
 895                                         var c = m as Constructor;
 896                                         if (c == null)
 897                                                 continue;
 898
 899                                         if (c.IsPrimaryConstructor) {
 900                                                 c.ApplyAttributeBuilder (a, ctor, cdata, pa);
 901                                                 return;
 902                                         }
 903                                 }
 904
 905                                 throw new InternalErrorException ();
 906                         }
 907
 908                         if (has_normal_indexers && a.Type == pa.DefaultMember) {
 909                                 Report.Error (646, a.Location, "Cannot specify the `DefaultMember' attribute on type containing an indexer");
 910                                 return;
 911                         }
 912
 913                         if (a.Type == pa.Required) {
 914                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
 915                                 return;
 916                         }
 917
 918                         TypeBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), cdata);
 919                 }
 920
 921                 public override AttributeTargets AttributeTargets {
 922                         get {
 923                                 throw new NotSupportedException ();
 924                         }
 925                 }
 926
 927                 public TypeSpec BaseType {
 928                         get {
 929                                 return spec.BaseType;
 930                         }
 931                 }
 932
 933                 protected virtual TypeAttributes TypeAttr {
 934                         get {
 935                                 return ModifiersExtensions.TypeAttr (ModFlags, IsTopLevel);
 936                         }
 937                 }
 938
 939                 public int TypeParametersCount {
 940                         get {
 941                                 return MemberName.Arity;
 942                         }
 943                 }
 944
 945                 TypeParameterSpec[] ITypeDefinition.TypeParameters {
 946                         get {
 947                                 var ctp = PartialContainer.CurrentTypeParameters;
 948                                 return ctp == null ? TypeParameterSpec.EmptyTypes : ctp.Types;
 949                         }
 950                 }
 951
 952                 public string GetAttributeDefaultMember ()
 953                 {
 954                         return indexer_name ?? DefaultIndexerName;
 955                 }
 956
 957                 public bool IsComImport {
 958                         get {
 959                                 if (OptAttributes == null)
 960                                         return false;
 961
 962                                 return OptAttributes.Contains (Module.PredefinedAttributes.ComImport);
 963                         }
 964                 }
 965
 966                 public void RegisterFieldForInitialization (MemberCore field, FieldInitializer expression)
 967                 {
 968                         if (IsPartialPart)
 969                                 PartialContainer.RegisterFieldForInitialization (field, expression);
 970
 971                         if ((field.ModFlags & Modifiers.STATIC) != 0){
 972                                 if (initialized_static_fields == null) {
 973                                         HasStaticFieldInitializer = true;
 974                                         initialized_static_fields = new List<FieldInitializer> (4);
 975                                 }
 976
 977                                 initialized_static_fields.Add (expression);
 978                         } else {
 979                                 if (Kind == MemberKind.Struct) {
 980                                         if (Compiler.Settings.Version != LanguageVersion.Experimental) {
 981                                                 Report.Error (573, expression.Location, "'{0}': Structs cannot have instance property or field initializers",
 982                                                         GetSignatureForError ());
 983                                         }
 984                                 }
 985
 986                                 if (initialized_fields == null)
 987                                         initialized_fields = new List<FieldInitializer> (4);
 988
 989                                 initialized_fields.Add (expression);
 990                         }
 991                 }
 992
 993                 public void ResolveFieldInitializers (BlockContext ec)
 994                 {
 995                         Debug.Assert (!IsPartialPart);
 996
 997                         if (ec.IsStatic) {
 998                                 if (initialized_static_fields == null)
 999                                         return;
1000
1001                                 bool has_complex_initializer = !ec.Module.Compiler.Settings.Optimize;
1002                                 int i;
1003                                 ExpressionStatement [] init = new ExpressionStatement [initialized_static_fields.Count];
1004                                 for (i = 0; i < initialized_static_fields.Count; ++i) {
1005                                         FieldInitializer fi = initialized_static_fields [i];
1006                                         ExpressionStatement s = fi.ResolveStatement (ec);
1007                                         if (s == null) {
1008                                                 s = EmptyExpressionStatement.Instance;
1009                                         } else if (!fi.IsSideEffectFree) {
1010                                                 has_complex_initializer = true;
1011                                         }
1012
1013                                         init [i] = s;
1014                                 }
1015
1016                                 for (i = 0; i < initialized_static_fields.Count; ++i) {
1017                                         FieldInitializer fi = initialized_static_fields [i];
1018                                         //
1019                                         // Need special check to not optimize code like this
1020                                         // static int a = b = 5;
1021                                         // static int b = 0;
1022                                         //
1023                                         if (!has_complex_initializer && fi.IsDefaultInitializer)
1024                                                 continue;
1025
1026                                         ec.AssignmentInfoOffset += fi.AssignmentOffset;
1027                                         ec.CurrentBlock.AddScopeStatement (new StatementExpression (init [i]));
1028                                 }
1029
1030                                 return;
1031                         }
1032
1033                         if (initialized_fields == null)
1034                                 return;
1035
1036                         for (int i = 0; i < initialized_fields.Count; ++i) {
1037                                 FieldInitializer fi = initialized_fields [i];
1038
1039                                 //
1040                                 // Clone before resolving otherwise when field initializer is needed
1041                                 // in more than 1 constructor any resolve after the initial one would
1042                                 // only took the resolved expression which is problem for expressions
1043                                 // that generate extra expressions or code during Resolve phase
1044                                 //
1045                                 var cloned = fi.Clone (new CloneContext ());
1046
1047                                 ExpressionStatement s = fi.ResolveStatement (ec);
1048                                 if (s == null) {
1049                                         initialized_fields [i] = new FieldInitializer (fi.Field, ErrorExpression.Instance, Location.Null);
1050                                         continue;
1051                                 }
1052
1053                                 //
1054                                 // Field is re-initialized to its default value => removed
1055                                 //
1056                                 if (fi.IsDefaultInitializer && Kind != MemberKind.Struct && ec.Module.Compiler.Settings.Optimize)
1057                                         continue;
1058
1059                                 ec.AssignmentInfoOffset += fi.AssignmentOffset;
1060                                 ec.CurrentBlock.AddScopeStatement (new StatementExpression (s));
1061                                 initialized_fields [i] = (FieldInitializer) cloned;
1062                         }
1063                 }
1064
1065                 public override string DocComment {
1066                         get {
1067                                 return comment;
1068                         }
1069                         set {
1070                                 if (value == null)
1071                                         return;
1072
1073                                 comment += value;
1074                         }
1075                 }
1076
1077                 public PendingImplementation PendingImplementations {
1078                         get { return pending; }
1079                 }
1080
1081                 internal override void GenerateDocComment (DocumentationBuilder builder)
1082                 {
1083                         if (IsPartialPart)
1084                                 return;
1085
1086                         base.GenerateDocComment (builder);
1087
1088                         foreach (var member in members)
1089                                 member.GenerateDocComment (builder);
1090                 }
1091
1092                 public TypeSpec GetAttributeCoClass ()
1093                 {
1094                         if (OptAttributes == null)
1095                                 return null;
1096
1097                         Attribute a = OptAttributes.Search (Module.PredefinedAttributes.CoClass);
1098                         if (a == null)
1099                                 return null;
1100
1101                         return a.GetCoClassAttributeValue ();
1102                 }
1103
1104                 public AttributeUsageAttribute GetAttributeUsage (PredefinedAttribute pa)
1105                 {
1106                         Attribute a = null;
1107                         if (OptAttributes != null) {
1108                                 a = OptAttributes.Search (pa);
1109                         }
1110
1111                         if (a == null)
1112                                 return null;
1113
1114                         return a.GetAttributeUsageAttribute ();
1115                 }
1116
1117                 public virtual CompilationSourceFile GetCompilationSourceFile ()
1118                 {
1119                         TypeContainer ns = Parent;
1120                         while (true) {
1121                                 var sf = ns as CompilationSourceFile;
1122                                 if (sf != null)
1123                                         return sf;
1124
1125                                 ns = ns.Parent;
1126                         }
1127                 }
1128
1129                 public override string GetSignatureForMetadata ()
1130                 {
1131                         if (Parent is TypeDefinition) {
1132                                 return Parent.GetSignatureForMetadata () + "+" + TypeNameParser.Escape (FilterNestedName (MemberName.Basename));
1133                         }
1134
1135                         return base.GetSignatureForMetadata ();
1136                 }
1137
1138                 public virtual void SetBaseTypes (List<FullNamedExpression> baseTypes)
1139                 {
1140                         type_bases = baseTypes;
1141                 }
1142
1143                 /// <summary>
1144                 ///   This function computes the Base class and also the
1145                 ///   list of interfaces that the class or struct @c implements.
1146                 ///
1147                 ///   The return value is an array (might be null) of
1148                 ///   interfaces implemented (as Types).
1149                 ///
1150                 ///   The @base_class argument is set to the base object or null
1151                 ///   if this is `System.Object'.
1152                 /// </summary>
1153                 protected virtual TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
1154                 {
1155                         base_class = null;
1156                         if (type_bases == null)
1157                                 return null;
1158
1159                         int count = type_bases.Count;
1160                         TypeSpec[] ifaces = null;
1161                         var base_context = new BaseContext (this);
1162                         for (int i = 0, j = 0; i < count; i++){
1163                                 FullNamedExpression fne = type_bases [i];
1164
1165                                 var fne_resolved = fne.ResolveAsType (base_context);
1166                                 if (fne_resolved == null)
1167                                         continue;
1168
1169                                 if (i == 0 && Kind == MemberKind.Class && !fne_resolved.IsInterface) {
1170                                         if (fne_resolved.BuiltinType == BuiltinTypeSpec.Type.Dynamic) {
1171                                                 Report.Error (1965, Location, "Class `{0}' cannot derive from the dynamic type",
1172                                                         GetSignatureForError ());
1173
1174                                                 continue;
1175                                         }
1176
1177                                         base_type = fne_resolved;
1178                                         base_class = fne;
1179                                         continue;
1180                                 }
1181
1182                                 if (ifaces == null)
1183                                         ifaces = new TypeSpec [count - i];
1184
1185                                 if (fne_resolved.IsInterface) {
1186                                         for (int ii = 0; ii < j; ++ii) {
1187                                                 if (fne_resolved == ifaces [ii]) {
1188                                                         Report.Error (528, Location, "`{0}' is already listed in interface list",
1189                                                                 fne_resolved.GetSignatureForError ());
1190                                                         break;
1191                                                 }
1192                                         }
1193
1194                                         if (Kind == MemberKind.Interface && !IsAccessibleAs (fne_resolved)) {
1195                                                 Report.Error (61, fne.Location,
1196                                                         "Inconsistent accessibility: base interface `{0}' is less accessible than interface `{1}'",
1197                                                         fne_resolved.GetSignatureForError (), GetSignatureForError ());
1198                                         }
1199                                 } else {
1200                                         Report.SymbolRelatedToPreviousError (fne_resolved);
1201                                         if (Kind != MemberKind.Class) {
1202                                                 Report.Error (527, fne.Location, "Type `{0}' in interface list is not an interface", fne_resolved.GetSignatureForError ());
1203                                         } else if (base_class != null)
1204                                                 Report.Error (1721, fne.Location, "`{0}': Classes cannot have multiple base classes (`{1}' and `{2}')",
1205                                                         GetSignatureForError (), base_class.GetSignatureForError (), fne_resolved.GetSignatureForError ());
1206                                         else {
1207                                                 Report.Error (1722, fne.Location, "`{0}': Base class `{1}' must be specified as first",
1208                                                         GetSignatureForError (), fne_resolved.GetSignatureForError ());
1209                                         }
1210                                 }
1211
1212                                 ifaces [j++] = fne_resolved;
1213                         }
1214
1215                         return ifaces;
1216                 }
1217
1218                 //
1219                 // Checks that some operators come in pairs:
1220                 //  == and !=
1221                 // > and <
1222                 // >= and <=
1223                 // true and false
1224                 //
1225                 // They are matched based on the return type and the argument types
1226                 //
1227                 void CheckPairedOperators ()
1228                 {
1229                         bool has_equality_or_inequality = false;
1230                         List<Operator.OpType> found_matched = new List<Operator.OpType> ();
1231
1232                         for (int i = 0; i < members.Count; ++i) {
1233                                 var o_a = members[i] as Operator;
1234                                 if (o_a == null)
1235                                         continue;
1236
1237                                 var o_type = o_a.OperatorType;
1238                                 if (o_type == Operator.OpType.Equality || o_type == Operator.OpType.Inequality)
1239                                         has_equality_or_inequality = true;
1240
1241                                 if (found_matched.Contains (o_type))
1242                                         continue;
1243
1244                                 var matching_type = o_a.GetMatchingOperator ();
1245                                 if (matching_type == Operator.OpType.TOP) {
1246                                         continue;
1247                                 }
1248
1249                                 bool pair_found = false;
1250                                 for (int ii = 0; ii < members.Count; ++ii) {
1251                                         var o_b = members[ii] as Operator;
1252                                         if (o_b == null || o_b.OperatorType != matching_type)
1253                                                 continue;
1254
1255                                         if (!TypeSpecComparer.IsEqual (o_a.ReturnType, o_b.ReturnType))
1256                                                 continue;
1257
1258                                         if (!TypeSpecComparer.Equals (o_a.ParameterTypes, o_b.ParameterTypes))
1259                                                 continue;
1260
1261                                         found_matched.Add (matching_type);
1262                                         pair_found = true;
1263                                         break;
1264                                 }
1265
1266                                 if (!pair_found) {
1267                                         Report.Error (216, o_a.Location,
1268                                                 "The operator `{0}' requires a matching operator `{1}' to also be defined",
1269                                                 o_a.GetSignatureForError (), Operator.GetName (matching_type));
1270                                 }
1271                         }
1272
1273                         if (has_equality_or_inequality) {
1274                                 if (!HasEquals)
1275                                         Report.Warning (660, 2, Location, "`{0}' defines operator == or operator != but does not override Object.Equals(object o)",
1276                                                 GetSignatureForError ());
1277
1278                                 if (!HasGetHashCode)
1279                                         Report.Warning (661, 2, Location, "`{0}' defines operator == or operator != but does not override Object.GetHashCode()",
1280                                                 GetSignatureForError ());
1281                         }
1282                 }
1283
1284                 public override void CreateMetadataName (StringBuilder sb)
1285                 {
1286                         if (Parent.MemberName != null) {
1287                                 Parent.CreateMetadataName (sb);
1288
1289                                 if (sb.Length != 0) {
1290                                         sb.Append (".");
1291                                 }
1292                         }
1293
1294                         sb.Append (MemberName.Basename);
1295                 }
1296
1297                 bool CreateTypeBuilder ()
1298                 {
1299                         //
1300                         // Sets .size to 1 for structs with no instance fields
1301                         //
1302                         int type_size = Kind == MemberKind.Struct && first_nonstatic_field == null && !(this is StateMachine) ? 1 : 0;
1303
1304                         var parent_def = Parent as TypeDefinition;
1305                         if (parent_def == null) {
1306                                 var sb = new StringBuilder ();
1307                                 CreateMetadataName (sb);
1308                                 TypeBuilder = Module.CreateBuilder (sb.ToString (), TypeAttr, type_size);
1309                         } else {
1310                                 TypeBuilder = parent_def.TypeBuilder.DefineNestedType (FilterNestedName (MemberName.Basename), TypeAttr, null, type_size);
1311                         }
1312
1313                         if (DeclaringAssembly.Importer != null)
1314                                 DeclaringAssembly.Importer.AddCompiledType (TypeBuilder, spec);
1315
1316                         spec.SetMetaInfo (TypeBuilder);
1317                         spec.MemberCache = new MemberCache (this);
1318
1319                         TypeParameters parentAllTypeParameters = null;
1320                         if (parent_def != null) {
1321                                 spec.DeclaringType = Parent.CurrentType;
1322                                 parent_def.MemberCache.AddMember (spec);
1323                                 parentAllTypeParameters = parent_def.all_type_parameters;
1324                         }
1325
1326                         if (MemberName.TypeParameters != null || parentAllTypeParameters != null) {
1327                                 var tparam_names = CreateTypeParameters (parentAllTypeParameters);
1328
1329                                 all_tp_builders = TypeBuilder.DefineGenericParameters (tparam_names);
1330
1331                                 if (CurrentTypeParameters != null) {
1332                                         CurrentTypeParameters.Create (spec, CurrentTypeParametersStartIndex, this);
1333                                         CurrentTypeParameters.Define (all_tp_builders);
1334                                 }
1335                         }
1336
1337                         return true;
1338                 }
1339
1340                 public static string FilterNestedName (string name)
1341                 {
1342                         //
1343                         // SRE API does not handle namespaces and types separately but
1344                         // determine that from '.' in name. That's problematic because
1345                         // dot is valid character for type name. By replacing any '.'
1346                         // in name we avoid any ambiguities and never emit metadata
1347                         // namespace for nested types
1348                         //
1349                         return name.Replace ('.', '_');
1350                 }
1351
1352                 string[] CreateTypeParameters (TypeParameters parentAllTypeParameters)
1353                 {
1354                         string[] names;
1355                         int parent_offset = 0;
1356                         if (parentAllTypeParameters != null) {
1357                                 if (CurrentTypeParameters == null) {
1358                                         all_type_parameters = parentAllTypeParameters;
1359                                         return parentAllTypeParameters.GetAllNames ();
1360                                 }
1361
1362                                 names = new string[parentAllTypeParameters.Count + CurrentTypeParameters.Count];
1363                                 all_type_parameters = new TypeParameters (names.Length);
1364                                 all_type_parameters.Add (parentAllTypeParameters);
1365
1366                                 parent_offset = all_type_parameters.Count;
1367                                 for (int i = 0; i < parent_offset; ++i)
1368                                         names[i] = all_type_parameters[i].MemberName.Name;
1369
1370                         } else {
1371                                 names = new string[CurrentTypeParameters.Count];
1372                         }
1373
1374                         for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
1375                                 if (all_type_parameters != null)
1376                                         all_type_parameters.Add (MemberName.TypeParameters[i]);
1377
1378                                 var name = CurrentTypeParameters[i].MemberName.Name;
1379                                 names[parent_offset + i] = name;
1380                                 for (int ii = 0; ii < parent_offset + i; ++ii) {
1381                                         if (names[ii] != name)
1382                                                 continue;
1383
1384                                         var tp = CurrentTypeParameters[i];
1385                                         var conflict = all_type_parameters[ii];
1386
1387                                         tp.WarningParentNameConflict (conflict);
1388                                 }
1389                         }
1390
1391                         if (all_type_parameters == null)
1392                                 all_type_parameters = CurrentTypeParameters;
1393
1394                         return names;
1395                 }
1396
1397
1398                 public SourceMethodBuilder CreateMethodSymbolEntry ()
1399                 {
1400                         if (Module.DeclaringAssembly.SymbolWriter == null || (ModFlags & Modifiers.DEBUGGER_HIDDEN) != 0)
1401                                 return null;
1402
1403                         var source_file = GetCompilationSourceFile ();
1404                         if (source_file == null)
1405                                 return null;
1406
1407                         return new SourceMethodBuilder (source_file.SymbolUnitEntry);
1408                 }
1409
1410                 //
1411                 // Creates a proxy base method call inside this container for hoisted base member calls
1412                 //
1413                 public MethodSpec CreateHoistedBaseCallProxy (ResolveContext rc, MethodSpec method)
1414                 {
1415                         Method proxy_method;
1416
1417                         //
1418                         // One proxy per base method is enough
1419                         //
1420                         if (hoisted_base_call_proxies == null) {
1421                                 hoisted_base_call_proxies = new Dictionary<MethodSpec, Method> ();
1422                                 proxy_method = null;
1423                         } else {
1424                                 hoisted_base_call_proxies.TryGetValue (method, out proxy_method);
1425                         }
1426
1427                         if (proxy_method == null) {
1428                                 string name = CompilerGeneratedContainer.MakeName (method.Name, null, "BaseCallProxy", hoisted_base_call_proxies.Count);
1429
1430                                 MemberName member_name;
1431                                 TypeArguments targs = null;
1432                                 TypeSpec return_type = method.ReturnType;
1433                                 var local_param_types = method.Parameters.Types;
1434
1435                                 if (method.IsGeneric) {
1436                                         //
1437                                         // Copy all base generic method type parameters info
1438                                         //
1439                                         var hoisted_tparams = method.GenericDefinition.TypeParameters;
1440                                         var tparams = new TypeParameters ();
1441
1442                                         targs = new TypeArguments ();
1443                                         targs.Arguments = new TypeSpec[hoisted_tparams.Length];
1444                                         for (int i = 0; i < hoisted_tparams.Length; ++i) {
1445                                                 var tp = hoisted_tparams[i];
1446                                                 var local_tp = new TypeParameter (tp, null, new MemberName (tp.Name, Location), null);
1447                                                 tparams.Add (local_tp);
1448
1449                                                 targs.Add (new SimpleName (tp.Name, Location));
1450                                                 targs.Arguments[i] = local_tp.Type;
1451                                         }
1452
1453                                         member_name = new MemberName (name, tparams, Location);
1454
1455                                         //
1456                                         // Mutate any method type parameters from original
1457                                         // to newly created hoisted version
1458                                         //
1459                                         var mutator = new TypeParameterMutator (hoisted_tparams, tparams);
1460                                         return_type = mutator.Mutate (return_type);
1461                                         local_param_types = mutator.Mutate (local_param_types);
1462                                 } else {
1463                                         member_name = new MemberName (name);
1464                                 }
1465
1466                                 var base_parameters = new Parameter[method.Parameters.Count];
1467                                 for (int i = 0; i < base_parameters.Length; ++i) {
1468                                         var base_param = method.Parameters.FixedParameters[i];
1469                                         base_parameters[i] = new Parameter (new TypeExpression (local_param_types [i], Location),
1470                                                 base_param.Name, base_param.ModFlags, null, Location);
1471                                         base_parameters[i].Resolve (this, i);
1472                                 }
1473
1474                                 var cloned_params = ParametersCompiled.CreateFullyResolved (base_parameters, method.Parameters.Types);
1475                                 if (method.Parameters.HasArglist) {
1476                                         cloned_params.FixedParameters[0] = new Parameter (null, "__arglist", Parameter.Modifier.NONE, null, Location);
1477                                         cloned_params.Types[0] = Module.PredefinedTypes.RuntimeArgumentHandle.Resolve ();
1478                                 }
1479
1480                                 // Compiler generated proxy
1481                                 proxy_method = new Method (this, new TypeExpression (return_type, Location),
1482                                         Modifiers.PRIVATE | Modifiers.COMPILER_GENERATED | Modifiers.DEBUGGER_HIDDEN,
1483                                         member_name, cloned_params, null);
1484
1485                                 var block = new ToplevelBlock (Compiler, proxy_method.ParameterInfo, Location) {
1486                                         IsCompilerGenerated = true
1487                                 };
1488
1489                                 var mg = MethodGroupExpr.CreatePredefined (method, method.DeclaringType, Location);
1490                                 mg.InstanceExpression = new BaseThis (method.DeclaringType, Location);
1491                                 if (targs != null)
1492                                         mg.SetTypeArguments (rc, targs);
1493
1494                                 // Get all the method parameters and pass them as arguments
1495                                 var real_base_call = new Invocation (mg, block.GetAllParametersArguments ());
1496                                 Statement statement;
1497                                 if (method.ReturnType.Kind == MemberKind.Void)
1498                                         statement = new StatementExpression (real_base_call);
1499                                 else
1500                                         statement = new Return (real_base_call, Location);
1501
1502                                 block.AddStatement (statement);
1503                                 proxy_method.Block = block;
1504
1505                                 members.Add (proxy_method);
1506                                 proxy_method.Define ();
1507                                 proxy_method.PrepareEmit ();
1508
1509                                 hoisted_base_call_proxies.Add (method, proxy_method);
1510                         }
1511
1512                         return proxy_method.Spec;
1513                 }
1514
1515                 protected bool DefineBaseTypes ()
1516                 {
1517                         if (IsPartialPart && Kind == MemberKind.Class)
1518                                 return true;
1519
1520                         return DoDefineBaseType ();
1521                 }
1522
1523                 bool DoDefineBaseType ()
1524                 {
1525                         iface_exprs = ResolveBaseTypes (out base_type_expr);
1526                         bool set_base_type;
1527
1528                         if (IsPartialPart) {
1529                                 set_base_type = false;
1530
1531                                 if (base_type_expr != null) {
1532                                         if (PartialContainer.base_type_expr != null && PartialContainer.base_type != base_type) {
1533                                                 Report.SymbolRelatedToPreviousError (base_type_expr.Location, "");
1534                                                 Report.Error (263, Location,
1535                                                         "Partial declarations of `{0}' must not specify different base classes",
1536                                                         GetSignatureForError ());
1537                                         } else {
1538                                                 PartialContainer.base_type_expr = base_type_expr;
1539                                                 PartialContainer.base_type = base_type;
1540                                                 set_base_type = true;
1541                                         }
1542                                 }
1543
1544                                 if (iface_exprs != null) {
1545                                         if (PartialContainer.iface_exprs == null)
1546                                                 PartialContainer.iface_exprs = iface_exprs;
1547                                         else {
1548                                                 var ifaces = new List<TypeSpec> (PartialContainer.iface_exprs);
1549                                                 foreach (var iface_partial in iface_exprs) {
1550                                                         if (ifaces.Contains (iface_partial))
1551                                                                 continue;
1552
1553                                                         ifaces.Add (iface_partial);
1554                                                 }
1555
1556                                                 PartialContainer.iface_exprs = ifaces.ToArray ();
1557                                         }
1558                                 }
1559
1560                                 PartialContainer.members.AddRange (members);
1561                                 if (containers != null) {
1562                                         if (PartialContainer.containers == null)
1563                                                 PartialContainer.containers = new List<TypeContainer> ();
1564
1565                                         PartialContainer.containers.AddRange (containers);
1566                                 }
1567
1568                                 if (PrimaryConstructorParameters != null) {
1569                                         if (PartialContainer.PrimaryConstructorParameters != null) {
1570                                                 Report.Error (8036, Location, "Only one part of a partial type can declare primary constructor parameters");
1571                                         } else {
1572                                                 PartialContainer.PrimaryConstructorParameters = PrimaryConstructorParameters;
1573                                         }
1574                                 }
1575
1576                                 members_defined = members_defined_ok = true;
1577                                 caching_flags |= Flags.CloseTypeCreated;
1578                         } else {
1579                                 set_base_type = true;
1580                         }
1581
1582                         var cycle = CheckRecursiveDefinition (this);
1583                         if (cycle != null) {
1584                                 Report.SymbolRelatedToPreviousError (cycle);
1585                                 if (this is Interface) {
1586                                         Report.Error (529, Location,
1587                                                 "Inherited interface `{0}' causes a cycle in the interface hierarchy of `{1}'",
1588                                             GetSignatureForError (), cycle.GetSignatureForError ());
1589
1590                                         iface_exprs = null;
1591                                         PartialContainer.iface_exprs = null;
1592                                 } else {
1593                                         Report.Error (146, Location,
1594                                                 "Circular base class dependency involving `{0}' and `{1}'",
1595                                                 GetSignatureForError (), cycle.GetSignatureForError ());
1596
1597                                         base_type = null;
1598                                         PartialContainer.base_type = null;
1599                                 }
1600                         }
1601
1602                         if (iface_exprs != null) {
1603                                 if (!PrimaryConstructorBaseArgumentsStart.IsNull) {
1604                                         Report.Error (8049, PrimaryConstructorBaseArgumentsStart, "Implemented interfaces cannot have arguments");
1605                                 }
1606
1607                                 foreach (var iface_type in iface_exprs) {
1608                                         // Prevents a crash, the interface might not have been resolved: 442144
1609                                         if (iface_type == null)
1610                                                 continue;
1611
1612                                         if (!spec.AddInterfaceDefined (iface_type))
1613                                                 continue;
1614
1615                                         TypeBuilder.AddInterfaceImplementation (iface_type.GetMetaInfo ());
1616                                 }
1617                         }
1618
1619                         if (Kind == MemberKind.Interface) {
1620                                 spec.BaseType = Compiler.BuiltinTypes.Object;
1621                                 return true;
1622                         }
1623
1624                         if (set_base_type) {
1625                                 SetBaseType ();
1626                         }
1627
1628                         //
1629                         // Base type of partial container has to be resolved before we
1630                         // resolve any nested types of the container. We need to know
1631                         // partial parts because the base type can be specified in file
1632                         // defined after current container
1633                         //
1634                         if (class_partial_parts != null) {
1635                                 foreach (var pp in class_partial_parts) {
1636                                         if (pp.PrimaryConstructorBaseArguments != null)
1637                                                 PrimaryConstructorBaseArguments = pp.PrimaryConstructorBaseArguments;
1638
1639                                         pp.DoDefineBaseType ();
1640                                 }
1641
1642                         }
1643
1644                         return true;
1645                 }
1646
1647                 void SetBaseType ()
1648                 {
1649                         if (base_type == null) {
1650                                 TypeBuilder.SetParent (null);
1651                                 return;
1652                         }
1653
1654                         if (spec.BaseType == base_type)
1655                                 return;
1656
1657                         spec.BaseType = base_type;
1658
1659                         if (IsPartialPart)
1660                                 spec.UpdateInflatedInstancesBaseType ();
1661
1662                         // Set base type after type creation
1663                         TypeBuilder.SetParent (base_type.GetMetaInfo ());
1664                 }
1665
1666                 public override void ExpandBaseInterfaces ()
1667                 {
1668                         DoResolveTypeParameters ();
1669
1670                         if (!IsPartialPart)
1671                                 DoExpandBaseInterfaces ();
1672
1673                         base.ExpandBaseInterfaces ();
1674                 }
1675
1676                 public void DoExpandBaseInterfaces ()
1677                 {
1678                         if ((caching_flags & Flags.InterfacesExpanded) != 0)
1679                                 return;
1680
1681                         caching_flags |= Flags.InterfacesExpanded;
1682
1683                         //
1684                         // Expand base interfaces. It cannot be done earlier because all partial
1685                         // interface parts need to be defined before the type they are used from
1686                         //
1687                         if (iface_exprs != null) {
1688                                 foreach (var iface in iface_exprs) {
1689                                         if (iface == null)
1690                                                 continue;
1691
1692                                         var td = iface.MemberDefinition as TypeDefinition;
1693                                         if (td != null)
1694                                                 td.DoExpandBaseInterfaces ();
1695
1696                                         if (iface.Interfaces == null)
1697                                                 continue;
1698
1699                                         foreach (var biface in iface.Interfaces) {
1700                                                 if (spec.AddInterfaceDefined (biface)) {
1701                                                         TypeBuilder.AddInterfaceImplementation (biface.GetMetaInfo ());
1702                                                 }
1703                                         }
1704                                 }
1705                         }
1706
1707                         //
1708                         // Include all base type interfaces too, see ImportTypeBase for details
1709                         //
1710                         if (base_type != null) {
1711                                 var td = base_type.MemberDefinition as TypeDefinition;
1712                                 if (td != null)
1713                                         td.DoExpandBaseInterfaces ();
1714
1715                                 //
1716                                 // Simply use base interfaces only, they are all expanded which makes
1717                                 // it easy to handle generic type argument propagation with single
1718                                 // inflator only.
1719                                 //
1720                                 // interface IA<T> : IB<T>
1721                                 // interface IB<U> : IC<U>
1722                                 // interface IC<V>
1723                                 //
1724                                 if (base_type.Interfaces != null) {
1725                                         foreach (var iface in base_type.Interfaces) {
1726                                                 spec.AddInterfaceDefined (iface);
1727                                         }
1728                                 }
1729                         }
1730                 }
1731
1732                 public override void PrepareEmit ()
1733                 {
1734                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
1735                                 return;
1736
1737                         foreach (var member in members) {
1738                                 var pbm = member as MemberBase;
1739                                 if (pbm != null)
1740                                         pbm.PrepareEmit ();
1741                         }
1742
1743                         base.PrepareEmit ();
1744                 }
1745
1746                 //
1747                 // Defines the type in the appropriate ModuleBuilder or TypeBuilder.
1748                 //
1749                 public override bool CreateContainer ()
1750                 {
1751                         if (TypeBuilder != null)
1752                                 return !error;
1753
1754                         if (error)
1755                                 return false;
1756
1757                         if (IsPartialPart) {
1758                                 spec = PartialContainer.spec;
1759                                 TypeBuilder = PartialContainer.TypeBuilder;
1760                                 all_tp_builders = PartialContainer.all_tp_builders;
1761                                 all_type_parameters = PartialContainer.all_type_parameters;
1762                         } else {
1763                                 if (!CreateTypeBuilder ()) {
1764                                         error = true;
1765                                         return false;
1766                                 }
1767                         }
1768
1769                         return base.CreateContainer ();
1770                 }
1771
1772                 protected override void DoDefineContainer ()
1773                 {
1774                         DefineBaseTypes ();
1775                 }
1776
1777                 //
1778                 // Replaces normal spec with predefined one when compiling corlib
1779                 // and this type container defines predefined type
1780                 //
1781                 public void SetPredefinedSpec (BuiltinTypeSpec spec)
1782                 {
1783                         // When compiling build-in types we start with two
1784                         // version of same type. One is of BuiltinTypeSpec and
1785                         // second one is ordinary TypeSpec. The unification
1786                         // happens at later stage when we know which type
1787                         // really matches the builtin type signature. However
1788                         // that means TypeSpec create during CreateType of this
1789                         // type has to be replaced with builtin one
1790                         //
1791                         spec.SetMetaInfo (TypeBuilder);
1792                         spec.MemberCache = this.spec.MemberCache;
1793                         spec.DeclaringType = this.spec.DeclaringType;
1794
1795                         this.spec = spec;
1796                         current_type = null;
1797                         if (class_partial_parts != null) {
1798                                 foreach (var part in class_partial_parts)
1799                                         part.spec = spec;
1800                         }
1801                 }
1802
1803                 public override void RemoveContainer (TypeContainer cont)
1804                 {
1805                         base.RemoveContainer (cont);
1806                         Members.Remove (cont);
1807                         Cache.Remove (cont.MemberName.Basename);
1808                 }
1809
1810                 protected virtual bool DoResolveTypeParameters ()
1811                 {
1812                         var tparams = MemberName.TypeParameters;
1813                         if (tparams == null)
1814                                 return true;
1815
1816                         var base_context = new BaseContext (this);
1817                         for (int i = 0; i < tparams.Count; ++i) {
1818                                 var tp = tparams[i];
1819
1820                                 if (!tp.ResolveConstraints (base_context)) {
1821                                         error = true;
1822                                         return false;
1823                                 }
1824
1825                                 if (IsPartialPart) {
1826                                         var pc_tp = PartialContainer.CurrentTypeParameters [i];
1827
1828                                         tp.Create (spec, this);
1829                                         tp.Define (pc_tp);
1830
1831                                         if (tp.OptAttributes != null) {
1832                                                 if (pc_tp.OptAttributes == null)
1833                                                         pc_tp.OptAttributes = tp.OptAttributes;
1834                                                 else
1835                                                         pc_tp.OptAttributes.Attrs.AddRange (tp.OptAttributes.Attrs);
1836                                         }
1837                                 }
1838                         }
1839
1840                         if (IsPartialPart) {
1841                                 PartialContainer.CurrentTypeParameters.UpdateConstraints (this);
1842                         }
1843
1844                         return true;
1845                 }
1846
1847                 TypeSpec CheckRecursiveDefinition (TypeDefinition tc)
1848                 {
1849                         if (InTransit != null)
1850                                 return spec;
1851
1852                         InTransit = tc;
1853
1854                         if (base_type != null) {
1855                                 var ptc = base_type.MemberDefinition as TypeDefinition;
1856                                 if (ptc != null && ptc.CheckRecursiveDefinition (this) != null)
1857                                         return base_type;
1858                         }
1859
1860                         if (iface_exprs != null && this is Interface) {
1861                                 foreach (var iface in iface_exprs) {
1862                                         // the interface might not have been resolved, prevents a crash, see #442144
1863                                         if (iface == null)
1864                                                 continue;
1865                                         var ptc = iface.MemberDefinition as Interface;
1866                                         if (ptc != null && ptc.CheckRecursiveDefinition (this) != null)
1867                                                 return iface;
1868                                 }
1869                         }
1870
1871                         if (!IsTopLevel && Parent.PartialContainer.CheckRecursiveDefinition (this) != null)
1872                                 return spec;
1873
1874                         InTransit = null;
1875                         return null;
1876                 }
1877
1878                 /// <summary>
1879                 ///   Populates our TypeBuilder with fields and methods
1880                 /// </summary>
1881                 public sealed override bool Define ()
1882                 {
1883                         if (members_defined)
1884                                 return members_defined_ok;
1885
1886                         members_defined_ok = DoDefineMembers ();
1887                         members_defined = true;
1888
1889                         base.Define ();
1890
1891                         return members_defined_ok;
1892                 }
1893
1894                 protected virtual bool DoDefineMembers ()
1895                 {
1896                         Debug.Assert (!IsPartialPart);
1897
1898                         if (iface_exprs != null) {
1899                                 foreach (var iface_type in iface_exprs) {
1900                                         if (iface_type == null)
1901                                                 continue;
1902
1903                                         // Ensure the base is always setup
1904                                         var compiled_iface = iface_type.MemberDefinition as Interface;
1905                                         if (compiled_iface != null)
1906                                                 compiled_iface.Define ();
1907
1908                                         iface_type.CheckObsoleteness (this, Location);
1909
1910                                         if (iface_type.Arity > 0) {
1911                                                 // TODO: passing `this' is wrong, should be base type iface instead
1912                                                 VarianceDecl.CheckTypeVariance (iface_type, Variance.Covariant, this);
1913
1914                                                 if (((InflatedTypeSpec) iface_type).HasDynamicArgument () && !IsCompilerGenerated) {
1915                                                         Report.Error (1966, Location,
1916                                                                 "`{0}': cannot implement a dynamic interface `{1}'",
1917                                                                 GetSignatureForError (), iface_type.GetSignatureForError ());
1918                                                         return false;
1919                                                 }
1920                                         }
1921
1922                                         if (iface_type.IsGenericOrParentIsGeneric) {
1923                                                 foreach (var prev_iface in iface_exprs) {
1924                                                         if (prev_iface == iface_type || prev_iface == null)
1925                                                                 break;
1926
1927                                                         if (!TypeSpecComparer.Unify.IsEqual (iface_type, prev_iface))
1928                                                                 continue;
1929
1930                                                         Report.Error (695, Location,
1931                                                                 "`{0}' cannot implement both `{1}' and `{2}' because they may unify for some type parameter substitutions",
1932                                                                 GetSignatureForError (), prev_iface.GetSignatureForError (), iface_type.GetSignatureForError ());
1933                                                 }
1934                                         }
1935                                 }
1936
1937                                 if (Kind == MemberKind.Interface) {
1938                                         foreach (var iface in spec.Interfaces) {
1939                                                 MemberCache.AddInterface (iface);
1940                                         }
1941                                 }
1942                         }
1943
1944                         if (base_type != null) {
1945                                 //
1946                                 // Run checks skipped during DefineType (e.g FullNamedExpression::ResolveAsType)
1947                                 //
1948                                 if (base_type_expr != null) {
1949                                         base_type.CheckObsoleteness (this, base_type_expr.Location);
1950
1951                                         if (IsGenericOrParentIsGeneric && base_type.IsAttribute) {
1952                                                 Report.Error (698, base_type_expr.Location,
1953                                                         "A generic type cannot derive from `{0}' because it is an attribute class",
1954                                                         base_type.GetSignatureForError ());
1955                                         }
1956                                 }
1957
1958                                 var baseContainer = base_type.MemberDefinition as ClassOrStruct;
1959                                 if (baseContainer != null) {
1960                                         baseContainer.Define ();
1961
1962                                         //
1963                                         // It can trigger define of this type (for generic types only)
1964                                         //
1965                                         if (HasMembersDefined)
1966                                                 return true;
1967                                 }
1968                         }
1969
1970                         if (Kind == MemberKind.Struct || Kind == MemberKind.Class) {
1971                                 pending = PendingImplementation.GetPendingImplementations (this);
1972                         }
1973
1974                         var count = members.Count;
1975                         for (int i = 0; i < count; ++i) {
1976                                 var mc = members[i] as InterfaceMemberBase;
1977                                 if (mc == null || !mc.IsExplicitImpl)
1978                                         continue;
1979
1980                                 try {
1981                                         mc.Define ();
1982                                 } catch (Exception e) {
1983                                         throw new InternalErrorException (mc, e);
1984                                 }
1985                         }
1986
1987                         for (int i = 0; i < count; ++i) {
1988                                 var mc = members[i] as InterfaceMemberBase;
1989                                 if (mc != null && mc.IsExplicitImpl)
1990                                         continue;
1991
1992                                 if (members[i] is TypeContainer)
1993                                         continue;
1994
1995                                 try {
1996                                         members[i].Define ();
1997                                 } catch (Exception e) {
1998                                         throw new InternalErrorException (members[i], e);
1999                                 }
2000                         }
2001
2002                         if (HasOperators) {
2003                                 CheckPairedOperators ();
2004                         }
2005
2006                         ComputeIndexerName();
2007
2008                         if (HasEquals && !HasGetHashCode) {
2009                                 Report.Warning (659, 3, Location,
2010                                         "`{0}' overrides Object.Equals(object) but does not override Object.GetHashCode()", GetSignatureForError ());
2011                         }
2012
2013                         if (Kind == MemberKind.Interface && iface_exprs != null) {
2014                                 MemberCache.RemoveHiddenMembers (spec);
2015                         }
2016
2017                         return true;
2018                 }
2019
2020                 void ComputeIndexerName ()
2021                 {
2022                         var indexers = MemberCache.FindMembers (spec, MemberCache.IndexerNameAlias, true);
2023                         if (indexers == null)
2024                                 return;
2025
2026                         string class_indexer_name = null;
2027
2028                         //
2029                         // Check normal indexers for consistent name, explicit interface implementation
2030                         // indexers are ignored
2031                         //
2032                         foreach (var indexer in indexers) {
2033                                 //
2034                                 // FindMembers can return unfiltered full hierarchy names
2035                                 //
2036                                 if (indexer.DeclaringType != spec)
2037                                         continue;
2038
2039                                 has_normal_indexers = true;
2040
2041                                 if (class_indexer_name == null) {
2042                                         indexer_name = class_indexer_name = indexer.Name;
2043                                         continue;
2044                                 }
2045
2046                                 if (indexer.Name != class_indexer_name)
2047                                         Report.Error (668, ((Indexer)indexer.MemberDefinition).Location,
2048                                                 "Two indexers have different names; the IndexerName attribute must be used with the same name on every indexer within a type");
2049                         }
2050                 }
2051
2052                 void EmitIndexerName ()
2053                 {
2054                         if (!has_normal_indexers)
2055                                 return;
2056
2057                         var ctor = Module.PredefinedMembers.DefaultMemberAttributeCtor.Get ();
2058                         if (ctor == null)
2059                                 return;
2060
2061                         var encoder = new AttributeEncoder ();
2062                         encoder.Encode (GetAttributeDefaultMember ());
2063                         encoder.EncodeEmptyNamedArguments ();
2064
2065                         TypeBuilder.SetCustomAttribute ((ConstructorInfo) ctor.GetMetaInfo (), encoder.ToArray ());
2066                 }
2067
2068                 public override void VerifyMembers ()
2069                 {
2070                         //
2071                         // Check for internal or private fields that were never assigned
2072                         //
2073                         if (!IsCompilerGenerated && Compiler.Settings.WarningLevel >= 3 && this == PartialContainer) {
2074                                 bool is_type_exposed = Kind == MemberKind.Struct || IsExposedFromAssembly ();
2075                                 foreach (var member in members) {
2076                                         if (member is Event) {
2077                                                 //
2078                                                 // An event can be assigned from same class only, report
2079                                                 // this warning for all accessibility modes
2080                                                 //
2081                                                 if (!member.IsUsed && !PartialContainer.HasStructLayout)
2082                                                         Report.Warning (67, 3, member.Location, "The event `{0}' is never used", member.GetSignatureForError ());
2083
2084                                                 continue;
2085                                         }
2086
2087                                         if ((member.ModFlags & Modifiers.AccessibilityMask) != Modifiers.PRIVATE) {
2088                                                 if (is_type_exposed)
2089                                                         continue;
2090
2091                                                 member.SetIsUsed ();
2092                                         }
2093
2094                                         var f = member as Field;
2095                                         if (f == null)
2096                                                 continue;
2097
2098                                         if (!member.IsUsed) {
2099                                                 if (!PartialContainer.HasStructLayout) {
2100                                                         if ((member.caching_flags & Flags.IsAssigned) == 0) {
2101                                                                 Report.Warning (169, 3, member.Location, "The private field `{0}' is never used", member.GetSignatureForError ());
2102                                                         } else {
2103                                                                 Report.Warning (414, 3, member.Location, "The private field `{0}' is assigned but its value is never used",
2104                                                                         member.GetSignatureForError ());
2105                                                         }
2106                                                 }
2107
2108                                                 continue;
2109                                         }
2110
2111                                         if ((f.caching_flags & Flags.IsAssigned) != 0)
2112                                                 continue;
2113
2114                                         //
2115                                         // Only report 649 on level 4
2116                                         //
2117                                         if (Compiler.Settings.WarningLevel < 4)
2118                                                 continue;
2119
2120                                         //
2121                                         // Don't be pedantic when type requires specific layout
2122                                         //
2123                                         if (f.OptAttributes != null || PartialContainer.HasStructLayout)
2124                                                 continue;
2125
2126                                         Constant c = New.Constantify (f.MemberType, f.Location);
2127                                         string value;
2128                                         if (c != null) {
2129                                                 value = c.GetValueAsLiteral ();
2130                                         } else if (TypeSpec.IsReferenceType (f.MemberType)) {
2131                                                 value = "null";
2132                                         } else {
2133                                                 value = null;
2134                                         }
2135
2136                                         if (value != null)
2137                                                 value = " `" + value + "'";
2138
2139                                         Report.Warning (649, 4, f.Location, "Field `{0}' is never assigned to, and will always have its default value{1}",
2140                                                 f.GetSignatureForError (), value);
2141                                 }
2142                         }
2143
2144                         base.VerifyMembers ();
2145                 }
2146
2147                 public override void Emit ()
2148                 {
2149                         if (OptAttributes != null)
2150                                 OptAttributes.Emit ();
2151
2152                         if (!IsCompilerGenerated) {
2153                                 if (!IsTopLevel) {
2154                                         MemberSpec candidate;
2155                                         bool overrides = false;
2156                                         var conflict_symbol = MemberCache.FindBaseMember (this, out candidate, ref overrides);
2157                                         if (conflict_symbol == null && candidate == null) {
2158                                                 if ((ModFlags & Modifiers.NEW) != 0)
2159                                                         Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required",
2160                                                                 GetSignatureForError ());
2161                                         } else {
2162                                                 if ((ModFlags & Modifiers.NEW) == 0) {
2163                                                         if (candidate == null)
2164                                                                 candidate = conflict_symbol;
2165
2166                                                         Report.SymbolRelatedToPreviousError (candidate);
2167                                                         Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended",
2168                                                                 GetSignatureForError (), candidate.GetSignatureForError ());
2169                                                 }
2170                                         }
2171                                 }
2172
2173                                 // Run constraints check on all possible generic types
2174                                 if (base_type != null && base_type_expr != null) {
2175                                         ConstraintChecker.Check (this, base_type, base_type_expr.Location);
2176                                 }
2177
2178                                 if (iface_exprs != null) {
2179                                         foreach (var iface_type in iface_exprs) {
2180                                                 if (iface_type == null)
2181                                                         continue;
2182
2183                                                 ConstraintChecker.Check (this, iface_type, Location);   // TODO: Location is wrong
2184                                         }
2185                                 }
2186                         }
2187
2188                         if (all_tp_builders != null) {
2189                                 int current_starts_index = CurrentTypeParametersStartIndex;
2190                                 for (int i = 0; i < all_tp_builders.Length; i++) {
2191                                         if (i < current_starts_index) {
2192                                                 all_type_parameters[i].EmitConstraints (all_tp_builders [i]);
2193                                         } else {
2194                                                 var tp = CurrentTypeParameters [i - current_starts_index];
2195                                                 tp.CheckGenericConstraints (!IsObsolete);
2196                                                 tp.Emit ();
2197                                         }
2198                                 }
2199                         }
2200
2201                         if ((ModFlags & Modifiers.COMPILER_GENERATED) != 0 && !Parent.IsCompilerGenerated)
2202                                 Module.PredefinedAttributes.CompilerGenerated.EmitAttribute (TypeBuilder);
2203
2204 #if STATIC
2205                         if ((TypeBuilder.Attributes & TypeAttributes.StringFormatMask) == 0 && Module.HasDefaultCharSet)
2206                                 TypeBuilder.__SetAttributes (TypeBuilder.Attributes | Module.DefaultCharSetType);
2207 #endif
2208
2209                         base.Emit ();
2210
2211                         for (int i = 0; i < members.Count; i++) {
2212                                 var m = members[i];
2213                                 if ((m.caching_flags & Flags.CloseTypeCreated) != 0)
2214                                         continue;
2215
2216                                 m.Emit ();
2217                         }
2218
2219                         EmitIndexerName ();
2220                         CheckAttributeClsCompliance ();
2221
2222                         if (pending != null)
2223                                 pending.VerifyPendingMethods ();
2224                 }
2225
2226
2227                 void CheckAttributeClsCompliance ()
2228                 {
2229                         if (!spec.IsAttribute || !IsExposedFromAssembly () || !Compiler.Settings.VerifyClsCompliance || !IsClsComplianceRequired ())
2230                                 return;
2231
2232                         foreach (var m in members) {
2233                                 var c = m as Constructor;
2234                                 if (c == null)
2235                                         continue;
2236
2237                                 if (c.HasCompliantArgs)
2238                                         return;
2239                         }
2240
2241                         Report.Warning (3015, 1, Location, "`{0}' has no accessible constructors which use only CLS-compliant types", GetSignatureForError ());
2242                 }
2243
2244                 public sealed override void EmitContainer ()
2245                 {
2246                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
2247                                 return;
2248
2249                         Emit ();
2250                 }
2251
2252                 public override void CloseContainer ()
2253                 {
2254                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
2255                                 return;
2256
2257                         // Close base type container first to avoid TypeLoadException
2258                         if (spec.BaseType != null) {
2259                                 var btype = spec.BaseType.MemberDefinition as TypeContainer;
2260                                 if (btype != null) {
2261                                         btype.CloseContainer ();
2262
2263                                         if ((caching_flags & Flags.CloseTypeCreated) != 0)
2264                                                 return;
2265                                 }
2266                         }
2267
2268                         try {
2269                                 caching_flags |= Flags.CloseTypeCreated;
2270                                 TypeBuilder.CreateType ();
2271                         } catch (TypeLoadException) {
2272                                 //
2273                                 // This is fine, the code still created the type
2274                                 //
2275                         } catch (Exception e) {
2276                                 throw new InternalErrorException (this, e);
2277                         }
2278
2279                         base.CloseContainer ();
2280
2281                         containers = null;
2282                         initialized_fields = null;
2283                         initialized_static_fields = null;
2284                         type_bases = null;
2285                         OptAttributes = null;
2286                 }
2287
2288                 //
2289                 // Performs the validation on a Method's modifiers (properties have
2290                 // the same properties).
2291                 //
2292                 // TODO: Why is it not done at parse stage, move to Modifiers::Check
2293                 //
2294                 public bool MethodModifiersValid (MemberCore mc)
2295                 {
2296                         const Modifiers vao = (Modifiers.VIRTUAL | Modifiers.ABSTRACT | Modifiers.OVERRIDE);
2297                         const Modifiers nv = (Modifiers.NEW | Modifiers.VIRTUAL);
2298                         bool ok = true;
2299                         var flags = mc.ModFlags;
2300
2301                         //
2302                         // At most one of static, virtual or override
2303                         //
2304                         if ((flags & Modifiers.STATIC) != 0){
2305                                 if ((flags & vao) != 0){
2306                                         Report.Error (112, mc.Location, "A static member `{0}' cannot be marked as override, virtual or abstract",
2307                                                 mc.GetSignatureForError ());
2308                                         ok = false;
2309                                 }
2310                         }
2311
2312                         if ((flags & Modifiers.OVERRIDE) != 0 && (flags & nv) != 0){
2313                                 Report.Error (113, mc.Location, "A member `{0}' marked as override cannot be marked as new or virtual",
2314                                         mc.GetSignatureForError ());
2315                                 ok = false;
2316                         }
2317
2318                         //
2319                         // If the declaration includes the abstract modifier, then the
2320                         // declaration does not include static, virtual or extern
2321                         //
2322                         if ((flags & Modifiers.ABSTRACT) != 0){
2323                                 if ((flags & Modifiers.EXTERN) != 0){
2324                                         Report.Error (
2325                                                 180, mc.Location, "`{0}' cannot be both extern and abstract", mc.GetSignatureForError ());
2326                                         ok = false;
2327                                 }
2328
2329                                 if ((flags & Modifiers.SEALED) != 0) {
2330                                         Report.Error (502, mc.Location, "`{0}' cannot be both abstract and sealed", mc.GetSignatureForError ());
2331                                         ok = false;
2332                                 }
2333
2334                                 if ((flags & Modifiers.VIRTUAL) != 0){
2335                                         Report.Error (503, mc.Location, "The abstract method `{0}' cannot be marked virtual", mc.GetSignatureForError ());
2336                                         ok = false;
2337                                 }
2338
2339                                 if ((ModFlags & Modifiers.ABSTRACT) == 0){
2340                                         Report.SymbolRelatedToPreviousError (this);
2341                                         Report.Error (513, mc.Location, "`{0}' is abstract but it is declared in the non-abstract class `{1}'",
2342                                                 mc.GetSignatureForError (), GetSignatureForError ());
2343                                         ok = false;
2344                                 }
2345                         }
2346
2347                         if ((flags & Modifiers.PRIVATE) != 0){
2348                                 if ((flags & vao) != 0){
2349                                         Report.Error (621, mc.Location, "`{0}': virtual or abstract members cannot be private", mc.GetSignatureForError ());
2350                                         ok = false;
2351                                 }
2352                         }
2353
2354                         if ((flags & Modifiers.SEALED) != 0){
2355                                 if ((flags & Modifiers.OVERRIDE) == 0){
2356                                         Report.Error (238, mc.Location, "`{0}' cannot be sealed because it is not an override", mc.GetSignatureForError ());
2357                                         ok = false;
2358                                 }
2359                         }
2360
2361                         return ok;
2362                 }
2363
2364                 protected override bool VerifyClsCompliance ()
2365                 {
2366                         if (!base.VerifyClsCompliance ())
2367                                 return false;
2368
2369                         // Check all container names for user classes
2370                         if (Kind != MemberKind.Delegate)
2371                                 MemberCache.VerifyClsCompliance (Definition, Report);
2372
2373                         if (BaseType != null && !BaseType.IsCLSCompliant ()) {
2374                                 Report.Warning (3009, 1, Location, "`{0}': base type `{1}' is not CLS-compliant",
2375                                         GetSignatureForError (), BaseType.GetSignatureForError ());
2376                         }
2377                         return true;
2378                 }
2379
2380                 /// <summary>
2381                 ///   Performs checks for an explicit interface implementation.  First it
2382                 ///   checks whether the `interface_type' is a base inteface implementation.
2383                 ///   Then it checks whether `name' exists in the interface type.
2384                 /// </summary>
2385                 public bool VerifyImplements (InterfaceMemberBase mb)
2386                 {
2387                         var ifaces = PartialContainer.Interfaces;
2388                         if (ifaces != null) {
2389                                 foreach (TypeSpec t in ifaces){
2390                                         if (t == mb.InterfaceType || t == null)
2391                                                 return true;
2392
2393                                         var expanded_base = t.Interfaces;
2394                                         if (expanded_base == null)
2395                                                 continue;
2396
2397                                         foreach (var bt in expanded_base) {
2398                                                 if (bt == mb.InterfaceType)
2399                                                         return true;
2400                                         }
2401                                 }
2402                         }
2403
2404                         Report.SymbolRelatedToPreviousError (mb.InterfaceType);
2405                         Report.Error (540, mb.Location, "`{0}': containing type does not implement interface `{1}'",
2406                                 mb.GetSignatureForError (), mb.InterfaceType.GetSignatureForError ());
2407                         return false;
2408                 }
2409
2410                 //
2411                 // Used for visiblity checks to tests whether this definition shares
2412                 // base type baseType, it does member-definition search
2413                 //
2414                 public bool IsBaseTypeDefinition (TypeSpec baseType)
2415                 {
2416                         // RootContext check
2417                         if (TypeBuilder == null)
2418                                 return false;
2419
2420                         var type = spec;
2421                         do {
2422                                 if (type.MemberDefinition == baseType.MemberDefinition)
2423                                         return true;
2424
2425                                 type = type.BaseType;
2426                         } while (type != null);
2427
2428                         return false;
2429                 }
2430
2431                 public override bool IsClsComplianceRequired ()
2432                 {
2433                         if (IsPartialPart)
2434                                 return PartialContainer.IsClsComplianceRequired ();
2435
2436                         return base.IsClsComplianceRequired ();
2437                 }
2438
2439                 bool ITypeDefinition.IsInternalAsPublic (IAssemblyDefinition assembly)
2440                 {
2441                         return Module.DeclaringAssembly == assembly;
2442                 }
2443
2444                 public virtual bool IsUnmanagedType ()
2445                 {
2446                         return false;
2447                 }
2448
2449                 public void LoadMembers (TypeSpec declaringType, bool onlyTypes, ref MemberCache cache)
2450                 {
2451                         throw new NotSupportedException ("Not supported for compiled definition " + GetSignatureForError ());
2452                 }
2453
2454                 //
2455                 // Public function used to locate types.
2456                 //
2457                 // Returns: Type or null if they type can not be found.
2458                 //
2459                 public override FullNamedExpression LookupNamespaceOrType (string name, int arity, LookupMode mode, Location loc)
2460                 {
2461                         FullNamedExpression e;
2462                         if (arity == 0 && Cache.TryGetValue (name, out e) && mode != LookupMode.IgnoreAccessibility)
2463                                 return e;
2464
2465                         e = null;
2466
2467                         if (arity == 0) {
2468                                 var tp = CurrentTypeParameters;
2469                                 if (tp != null) {
2470                                         TypeParameter tparam = tp.Find (name);
2471                                         if (tparam != null)
2472                                                 e = new TypeParameterExpr (tparam, Location.Null);
2473                                 }
2474                         }
2475
2476                         if (e == null) {
2477                                 TypeSpec t = LookupNestedTypeInHierarchy (name, arity);
2478
2479                                 if (t != null && (t.IsAccessible (this) || mode == LookupMode.IgnoreAccessibility))
2480                                         e = new TypeExpression (t, Location.Null);
2481                                 else {
2482                                         var errors = Compiler.Report.Errors;
2483                                         e = Parent.LookupNamespaceOrType (name, arity, mode, loc);
2484
2485                                         // TODO: LookupNamespaceOrType does more than just lookup. The result
2486                                         // cannot be cached or the error reporting won't happen
2487                                         if (errors != Compiler.Report.Errors)
2488                                                 return e;
2489                                 }
2490                         }
2491
2492                         // TODO MemberCache: How to cache arity stuff ?
2493                         if (arity == 0 && mode == LookupMode.Normal)
2494                                 Cache[name] = e;
2495
2496                         return e;
2497                 }
2498
2499                 TypeSpec LookupNestedTypeInHierarchy (string name, int arity)
2500                 {
2501                         // Has any nested type
2502                         // Does not work, because base type can have
2503                         //if (PartialContainer.Types == null)
2504                         //      return null;
2505
2506                         var container = PartialContainer.CurrentType;
2507                         return MemberCache.FindNestedType (container, name, arity, false);
2508                 }
2509
2510                 public void Mark_HasEquals ()
2511                 {
2512                         cached_method |= CachedMethods.Equals;
2513                 }
2514
2515                 public void Mark_HasGetHashCode ()
2516                 {
2517                         cached_method |= CachedMethods.GetHashCode;
2518                 }
2519
2520                 public override void WriteDebugSymbol (MonoSymbolFile file)
2521                 {
2522                         if (IsPartialPart)
2523                                 return;
2524
2525                         foreach (var m in members) {
2526                                 m.WriteDebugSymbol (file);
2527                         }
2528                 }
2529
2530                 /// <summary>
2531                 /// Method container contains Equals method
2532                 /// </summary>
2533                 public bool HasEquals {
2534                         get {
2535                                 return (cached_method & CachedMethods.Equals) != 0;
2536                         }
2537                 }
2538
2539                 /// <summary>
2540                 /// Method container contains GetHashCode method
2541                 /// </summary>
2542                 public bool HasGetHashCode {
2543                         get {
2544                                 return (cached_method & CachedMethods.GetHashCode) != 0;
2545                         }
2546                 }
2547
2548                 public bool HasStaticFieldInitializer {
2549                         get {
2550                                 return (cached_method & CachedMethods.HasStaticFieldInitializer) != 0;
2551                         }
2552                         set {
2553                                 if (value)
2554                                         cached_method |= CachedMethods.HasStaticFieldInitializer;
2555                                 else
2556                                         cached_method &= ~CachedMethods.HasStaticFieldInitializer;
2557                         }
2558                 }
2559
2560                 public override string DocCommentHeader {
2561                         get { return "T:"; }
2562                 }
2563         }
2564
2565         public abstract class ClassOrStruct : TypeDefinition
2566         {
2567                 public const TypeAttributes StaticClassAttribute = TypeAttributes.Abstract | TypeAttributes.Sealed;
2568
2569                 SecurityType declarative_security;
2570                 protected Constructor generated_primary_constructor;
2571
2572                 protected ClassOrStruct (TypeContainer parent, MemberName name, Attributes attrs, MemberKind kind)
2573                         : base (parent, name, attrs, kind)
2574                 {
2575                 }
2576
2577                 public ToplevelBlock PrimaryConstructorBlock { get; set; }
2578
2579                 protected override TypeAttributes TypeAttr {
2580                         get {
2581                                 TypeAttributes ta = base.TypeAttr;
2582                                 if (!has_static_constructor)
2583                                         ta |= TypeAttributes.BeforeFieldInit;
2584
2585                                 if (Kind == MemberKind.Class) {
2586                                         ta |= TypeAttributes.AutoLayout | TypeAttributes.Class;
2587                                         if (IsStatic)
2588                                                 ta |= StaticClassAttribute;
2589                                 } else {
2590                                         ta |= TypeAttributes.SequentialLayout;
2591                                 }
2592
2593                                 return ta;
2594                         }
2595                 }
2596
2597                 public override void AddNameToContainer (MemberCore symbol, string name)
2598                 {
2599                         if (!(symbol is Constructor) && symbol.MemberName.Name == MemberName.Name) {
2600                                 if (symbol is TypeParameter) {
2601                                         Report.Error (694, symbol.Location,
2602                                                 "Type parameter `{0}' has same name as containing type, or method",
2603                                                 symbol.GetSignatureForError ());
2604                                         return;
2605                                 }
2606
2607                                 InterfaceMemberBase imb = symbol as InterfaceMemberBase;
2608                                 if (imb == null || !imb.IsExplicitImpl) {
2609                                         Report.SymbolRelatedToPreviousError (this);
2610                                         Report.Error (542, symbol.Location, "`{0}': member names cannot be the same as their enclosing type",
2611                                                 symbol.GetSignatureForError ());
2612                                         return;
2613                                 }
2614                         }
2615
2616                         base.AddNameToContainer (symbol, name);
2617                 }
2618
2619                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2620                 {
2621                         if (a.IsValidSecurityAttribute ()) {
2622                                 a.ExtractSecurityPermissionSet (ctor, ref declarative_security);
2623                                 return;
2624                         }
2625
2626                         if (a.Type == pa.StructLayout) {
2627                                 PartialContainer.HasStructLayout = true;
2628                                 if (a.IsExplicitLayoutKind ())
2629                                         PartialContainer.HasExplicitLayout = true;
2630                         }
2631
2632                         if (a.Type == pa.Dynamic) {
2633                                 a.Error_MisusedDynamicAttribute ();
2634                                 return;
2635                         }
2636
2637                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2638                 }
2639
2640                 /// <summary>
2641                 /// Defines the default constructors
2642                 /// </summary>
2643                 protected virtual Constructor DefineDefaultConstructor (bool is_static)
2644                 {
2645                         // The default instance constructor is public
2646                         // If the class is abstract, the default constructor is protected
2647                         // The default static constructor is private
2648
2649                         Modifiers mods;
2650                         ParametersCompiled parameters = null;
2651                         if (is_static) {
2652                                 mods = Modifiers.STATIC | Modifiers.PRIVATE;
2653                                 parameters = ParametersCompiled.EmptyReadOnlyParameters;
2654                         } else {
2655                                 mods = ((ModFlags & Modifiers.ABSTRACT) != 0) ? Modifiers.PROTECTED : Modifiers.PUBLIC;
2656                                 parameters = PrimaryConstructorParameters ?? ParametersCompiled.EmptyReadOnlyParameters;
2657                         }
2658
2659                         var c = new Constructor (this, MemberName.Name, mods, null, parameters, Location);
2660                         if (Kind == MemberKind.Class)
2661                                 c.Initializer = new GeneratedBaseInitializer (Location, PrimaryConstructorBaseArguments);
2662
2663                         if (PrimaryConstructorParameters != null && !is_static) {
2664                                 c.IsPrimaryConstructor = true;
2665                                 c.caching_flags |= Flags.MethodOverloadsExist;
2666                         }
2667
2668                         AddConstructor (c, true);
2669                         if (PrimaryConstructorBlock == null) {
2670                                 c.Block = new ToplevelBlock (Compiler, parameters, Location) {
2671                                         IsCompilerGenerated = true
2672                                 };
2673                         } else {
2674                                 c.Block = PrimaryConstructorBlock;
2675                         }
2676
2677                         return c;
2678                 }
2679
2680                 protected override bool DoDefineMembers ()
2681                 {
2682                         CheckProtectedModifier ();
2683
2684                         if (PrimaryConstructorParameters != null) {
2685
2686                                 foreach (Parameter p in PrimaryConstructorParameters.FixedParameters) {
2687                                         if (p.Name == MemberName.Name) {
2688                                                 Report.Error (8039, p.Location, "Primary constructor of type `{0}' has parameter of same name as containing type",
2689                                                         GetSignatureForError ());
2690                                         }
2691
2692                                         if (CurrentTypeParameters != null) {
2693                                                 for (int i = 0; i < CurrentTypeParameters.Count; ++i) {
2694                                                         var tp = CurrentTypeParameters [i];
2695                                                         if (p.Name == tp.Name) {
2696                                                                 Report.Error (8038, p.Location, "Primary constructor of type `{0}' has parameter of same name as type parameter `{1}'",
2697                                                                         GetSignatureForError (), p.GetSignatureForError ());
2698                                                         }
2699                                                 }
2700                                         }
2701                                 }
2702                         }
2703
2704                         base.DoDefineMembers ();
2705
2706                         return true;
2707                 }
2708
2709                 public override void PrepareEmit ()
2710                 {
2711                         var s = this as Struct;
2712                         if (s == null || !s.HasUnmanagedCheckDone) {
2713                                 for (int i = 0; i < Members.Count; ++i) {
2714                                         var f = Members [i] as Field;
2715                                         if (f == null || f.MemberType == null || !f.MemberType.IsPointer)
2716                                                 continue;
2717
2718                                         TypeManager.VerifyUnmanaged (Module, f.MemberType, f.Location);
2719                                 }
2720                         }
2721
2722                         base.PrepareEmit ();
2723                 }
2724
2725                 public override void Emit ()
2726                 {
2727                         if (!has_static_constructor && HasStaticFieldInitializer) {
2728                                 var c = DefineDefaultConstructor (true);
2729                                 c.Define ();
2730                         }
2731
2732                         base.Emit ();
2733
2734                         if (declarative_security != null) {
2735                                 foreach (var de in declarative_security) {
2736 #if STATIC
2737                                         TypeBuilder.__AddDeclarativeSecurity (de);
2738 #else
2739                                         TypeBuilder.AddDeclarativeSecurity (de.Key, de.Value);
2740 #endif
2741                                 }
2742                         }
2743                 }
2744         }
2745
2746
2747         public sealed class Class : ClassOrStruct
2748         {
2749                 const Modifiers AllowedModifiers =
2750                         Modifiers.NEW |
2751                         Modifiers.PUBLIC |
2752                         Modifiers.PROTECTED |
2753                         Modifiers.INTERNAL |
2754                         Modifiers.PRIVATE |
2755                         Modifiers.ABSTRACT |
2756                         Modifiers.SEALED |
2757                         Modifiers.STATIC |
2758                         Modifiers.UNSAFE;
2759
2760                 public Class (TypeContainer parent, MemberName name, Modifiers mod, Attributes attrs)
2761                         : base (parent, name, attrs, MemberKind.Class)
2762                 {
2763                         var accmods = IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2764                         this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, Location, Report);
2765                         spec = new TypeSpec (Kind, null, this, null, ModFlags);
2766                 }
2767
2768                 public override void Accept (StructuralVisitor visitor)
2769                 {
2770                         visitor.Visit (this);
2771                 }
2772
2773                 public override void SetBaseTypes (List<FullNamedExpression> baseTypes)
2774                 {
2775                         var pmn = MemberName;
2776                         if (pmn.Name == "Object" && !pmn.IsGeneric && Parent.MemberName.Name == "System" && Parent.MemberName.Left == null)
2777                                 Report.Error (537, Location,
2778                                         "The class System.Object cannot have a base class or implement an interface.");
2779
2780                         base.SetBaseTypes (baseTypes);
2781                 }
2782
2783                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
2784                 {
2785                         if (a.Type == pa.AttributeUsage) {
2786                                 if (!BaseType.IsAttribute && spec.BuiltinType != BuiltinTypeSpec.Type.Attribute) {
2787                                         Report.Error (641, a.Location, "Attribute `{0}' is only valid on classes derived from System.Attribute", a.GetSignatureForError ());
2788                                 }
2789                         }
2790
2791                         if (a.Type == pa.Conditional && !BaseType.IsAttribute) {
2792                                 Report.Error (1689, a.Location, "Attribute `System.Diagnostics.ConditionalAttribute' is only valid on methods or attribute classes");
2793                                 return;
2794                         }
2795
2796                         if (a.Type == pa.ComImport && !attributes.Contains (pa.Guid)) {
2797                                 a.Error_MissingGuidAttribute ();
2798                                 return;
2799                         }
2800
2801                         if (a.Type == pa.Extension) {
2802                                 a.Error_MisusedExtensionAttribute ();
2803                                 return;
2804                         }
2805
2806                         if (a.Type.IsConditionallyExcluded (this))
2807                                 return;
2808
2809                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
2810                 }
2811
2812                 public override AttributeTargets AttributeTargets {
2813                         get {
2814                                 return AttributeTargets.Class;
2815                         }
2816                 }
2817
2818                 protected override bool DoDefineMembers ()
2819                 {
2820                         if ((ModFlags & Modifiers.ABSTRACT) == Modifiers.ABSTRACT && (ModFlags & (Modifiers.SEALED | Modifiers.STATIC)) != 0) {
2821                                 Report.Error (418, Location, "`{0}': an abstract class cannot be sealed or static", GetSignatureForError ());
2822                         }
2823
2824                         if ((ModFlags & (Modifiers.SEALED | Modifiers.STATIC)) == (Modifiers.SEALED | Modifiers.STATIC)) {
2825                                 Report.Error (441, Location, "`{0}': a class cannot be both static and sealed", GetSignatureForError ());
2826                         }
2827
2828                         if (IsStatic) {
2829                                 if (PrimaryConstructorParameters != null) {
2830                                         Report.Error (-800, Location, "`{0}': Static classes cannot have primary constructor", GetSignatureForError ());
2831                                         PrimaryConstructorParameters = null;
2832                                 }
2833
2834                                 foreach (var m in Members) {
2835                                         if (m is Operator) {
2836                                                 Report.Error (715, m.Location, "`{0}': Static classes cannot contain user-defined operators", m.GetSignatureForError ());
2837                                                 continue;
2838                                         }
2839
2840                                         if (m is Destructor) {
2841                                                 Report.Error (711, m.Location, "`{0}': Static classes cannot contain destructor", GetSignatureForError ());
2842                                                 continue;
2843                                         }
2844
2845                                         if (m is Indexer) {
2846                                                 Report.Error (720, m.Location, "`{0}': cannot declare indexers in a static class", m.GetSignatureForError ());
2847                                                 continue;
2848                                         }
2849
2850                                         if ((m.ModFlags & Modifiers.STATIC) != 0 || m is TypeContainer)
2851                                                 continue;
2852
2853                                         if (m is Constructor) {
2854                                                 Report.Error (710, m.Location, "`{0}': Static classes cannot have instance constructors", GetSignatureForError ());
2855                                                 continue;
2856                                         }
2857
2858                                         Report.Error (708, m.Location, "`{0}': cannot declare instance members in a static class", m.GetSignatureForError ());
2859                                 }
2860                         } else {
2861                                 if (!PartialContainer.HasInstanceConstructor || PrimaryConstructorParameters != null)
2862                                         generated_primary_constructor = DefineDefaultConstructor (false);
2863                         }
2864
2865                         return base.DoDefineMembers ();
2866                 }
2867
2868                 public override void Emit ()
2869                 {
2870                         base.Emit ();
2871
2872                         if ((ModFlags & Modifiers.METHOD_EXTENSION) != 0)
2873                                 Module.PredefinedAttributes.Extension.EmitAttribute (TypeBuilder);
2874
2875                         if (base_type != null && base_type.HasDynamicElement) {
2876                                 Module.PredefinedAttributes.Dynamic.EmitAttribute (TypeBuilder, base_type, Location);
2877                         }
2878                 }
2879
2880                 public override void GetCompletionStartingWith (string prefix, List<string> results)
2881                 {
2882                         base.GetCompletionStartingWith (prefix, results);
2883
2884                         var bt = base_type;
2885                         while (bt != null) {
2886                                 results.AddRange (MemberCache.GetCompletitionMembers (this, bt, prefix).Where (l => l.IsStatic).Select (l => l.Name));
2887                                 bt = bt.BaseType;
2888                         }
2889                 }
2890
2891                 protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
2892                 {
2893                         var ifaces = base.ResolveBaseTypes (out base_class);
2894
2895                         if (base_class == null) {
2896                                 if (spec.BuiltinType != BuiltinTypeSpec.Type.Object)
2897                                         base_type = Compiler.BuiltinTypes.Object;
2898                         } else {
2899                                 if (base_type.IsGenericParameter){
2900                                         Report.Error (689, base_class.Location, "`{0}': Cannot derive from type parameter `{1}'",
2901                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2902                                 } else if (base_type.IsStatic) {
2903                                         Report.SymbolRelatedToPreviousError (base_type);
2904                                         Report.Error (709, Location, "`{0}': Cannot derive from static class `{1}'",
2905                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2906                                 } else if (base_type.IsSealed) {
2907                                         Report.SymbolRelatedToPreviousError (base_type);
2908                                         Report.Error (509, Location, "`{0}': cannot derive from sealed type `{1}'",
2909                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2910                                 } else if (PartialContainer.IsStatic && base_type.BuiltinType != BuiltinTypeSpec.Type.Object) {
2911                                         Report.Error (713, Location, "Static class `{0}' cannot derive from type `{1}'. Static classes must derive from object",
2912                                                 GetSignatureForError (), base_type.GetSignatureForError ());
2913                                 }
2914
2915                                 switch (base_type.BuiltinType) {
2916                                 case BuiltinTypeSpec.Type.Enum:
2917                                 case BuiltinTypeSpec.Type.ValueType:
2918                                 case BuiltinTypeSpec.Type.MulticastDelegate:
2919                                 case BuiltinTypeSpec.Type.Delegate:
2920                                 case BuiltinTypeSpec.Type.Array:
2921                                         if (!(spec is BuiltinTypeSpec)) {
2922                                                 Report.Error (644, Location, "`{0}' cannot derive from special class `{1}'",
2923                                                         GetSignatureForError (), base_type.GetSignatureForError ());
2924
2925                                                 base_type = Compiler.BuiltinTypes.Object;
2926                                         }
2927                                         break;
2928                                 }
2929
2930                                 if (!IsAccessibleAs (base_type)) {
2931                                         Report.SymbolRelatedToPreviousError (base_type);
2932                                         Report.Error (60, Location, "Inconsistent accessibility: base class `{0}' is less accessible than class `{1}'",
2933                                                 base_type.GetSignatureForError (), GetSignatureForError ());
2934                                 }
2935                         }
2936
2937                         if (PartialContainer.IsStatic && ifaces != null) {
2938                                 foreach (var t in ifaces)
2939                                         Report.SymbolRelatedToPreviousError (t);
2940                                 Report.Error (714, Location, "Static class `{0}' cannot implement interfaces", GetSignatureForError ());
2941                         }
2942
2943                         return ifaces;
2944                 }
2945
2946                 /// Search for at least one defined condition in ConditionalAttribute of attribute class
2947                 /// Valid only for attribute classes.
2948                 public override string[] ConditionalConditions ()
2949                 {
2950                         if ((caching_flags & (Flags.Excluded_Undetected | Flags.Excluded)) == 0)
2951                                 return null;
2952
2953                         caching_flags &= ~Flags.Excluded_Undetected;
2954
2955                         if (OptAttributes == null)
2956                                 return null;
2957
2958                         Attribute[] attrs = OptAttributes.SearchMulti (Module.PredefinedAttributes.Conditional);
2959                         if (attrs == null)
2960                                 return null;
2961
2962                         string[] conditions = new string[attrs.Length];
2963                         for (int i = 0; i < conditions.Length; ++i)
2964                                 conditions[i] = attrs[i].GetConditionalAttributeValue ();
2965
2966                         caching_flags |= Flags.Excluded;
2967                         return conditions;
2968                 }
2969         }
2970
2971         public sealed class Struct : ClassOrStruct
2972         {
2973                 bool is_unmanaged, has_unmanaged_check_done, requires_delayed_unmanagedtype_check;
2974                 bool InTransit;
2975
2976                 // <summary>
2977                 //   Modifiers allowed in a struct declaration
2978                 // </summary>
2979                 const Modifiers AllowedModifiers =
2980                         Modifiers.NEW       |
2981                         Modifiers.PUBLIC    |
2982                         Modifiers.PROTECTED |
2983                         Modifiers.INTERNAL  |
2984                         Modifiers.UNSAFE    |
2985                         Modifiers.PRIVATE;
2986
2987                 public Struct (TypeContainer parent, MemberName name, Modifiers mod, Attributes attrs)
2988                         : base (parent, name, attrs, MemberKind.Struct)
2989                 {
2990                         var accmods = IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE;
2991                         this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, Location, Report) | Modifiers.SEALED ;
2992                         spec = new TypeSpec (Kind, null, this, null, ModFlags);
2993                 }
2994
2995                 public override AttributeTargets AttributeTargets {
2996                         get {
2997                                 return AttributeTargets.Struct;
2998                         }
2999                 }
3000
3001                 public override void Accept (StructuralVisitor visitor)
3002                 {
3003                         visitor.Visit (this);
3004                 }
3005
3006                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
3007                 {
3008                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
3009
3010                         //
3011                         // When struct constains fixed fixed and struct layout has explicitly
3012                         // set CharSet, its value has to be propagated to compiler generated
3013                         // fixed types
3014                         //
3015                         if (a.Type == pa.StructLayout) {
3016                                 var value = a.GetNamedValue ("CharSet");
3017                                 if (value == null)
3018                                         return;
3019
3020                                 for (int i = 0; i < Members.Count; ++i) {
3021                                         FixedField ff = Members [i] as FixedField;
3022                                         if (ff == null)
3023                                                 continue;
3024
3025                                         ff.CharSetValue = (CharSet) System.Enum.Parse (typeof (CharSet), value.GetValue ().ToString ());
3026                                 }
3027                         }
3028                 }
3029
3030                 bool CheckStructCycles ()
3031                 {
3032                         if (InTransit)
3033                                 return false;
3034
3035                         InTransit = true;
3036                         foreach (var member in Members) {
3037                                 var field = member as Field;
3038                                 if (field == null)
3039                                         continue;
3040
3041                                 TypeSpec ftype = field.Spec.MemberType;
3042                                 if (!ftype.IsStruct)
3043                                         continue;
3044
3045                                 if (ftype is BuiltinTypeSpec)
3046                                         continue;
3047
3048                                 foreach (var targ in ftype.TypeArguments) {
3049                                         if (!CheckFieldTypeCycle (targ)) {
3050                                                 Report.Error (523, field.Location,
3051                                                         "Struct member `{0}' of type `{1}' causes a cycle in the struct layout",
3052                                                         field.GetSignatureForError (), ftype.GetSignatureForError ());
3053                                                 break;
3054                                         }
3055                                 }
3056
3057                                 //
3058                                 // Static fields of exactly same type are allowed
3059                                 //
3060                                 if (field.IsStatic && ftype == CurrentType)
3061                                         continue;
3062
3063                                 if (!CheckFieldTypeCycle (ftype)) {
3064                                         Report.Error (523, field.Location,
3065                                                 "Struct member `{0}' of type `{1}' causes a cycle in the struct layout",
3066                                                 field.GetSignatureForError (), ftype.GetSignatureForError ());
3067                                         break;
3068                                 }
3069                         }
3070
3071                         InTransit = false;
3072                         return true;
3073                 }
3074
3075                 static bool CheckFieldTypeCycle (TypeSpec ts)
3076                 {
3077                         var fts = ts.MemberDefinition as Struct;
3078                         if (fts == null)
3079                                 return true;
3080
3081                         return fts.CheckStructCycles ();
3082                 }
3083
3084                 protected override bool DoDefineMembers ()
3085                 {
3086                         var res = base.DoDefineMembers ();
3087
3088                         if (PrimaryConstructorParameters != null || (initialized_fields != null && !HasUserDefaultConstructor ())) {
3089                                 generated_primary_constructor = DefineDefaultConstructor (false);
3090                                 generated_primary_constructor.Define ();
3091                         }
3092
3093                         return res;
3094                 }
3095
3096                 public override void Emit ()
3097                 {
3098                         CheckStructCycles ();
3099
3100                         base.Emit ();
3101                 }
3102
3103                 public bool HasUnmanagedCheckDone {
3104                         get {
3105                                 return has_unmanaged_check_done;
3106                         }
3107                 }
3108
3109                 bool HasUserDefaultConstructor ()
3110                 {
3111                         foreach (var m in PartialContainer.Members) {
3112                                 var c = m as Constructor;
3113                                 if (c == null)
3114                                         continue;
3115
3116                                 if (!c.IsStatic && c.ParameterInfo.IsEmpty)
3117                                         return true;
3118                         }
3119
3120                         return false;
3121                 }
3122
3123                 public override bool IsUnmanagedType ()
3124                 {
3125                         if (has_unmanaged_check_done)
3126                                 return is_unmanaged;
3127
3128                         if (requires_delayed_unmanagedtype_check)
3129                                 return true;
3130
3131                         var parent_def = Parent.PartialContainer;
3132                         if (parent_def != null && parent_def.IsGenericOrParentIsGeneric) {
3133                                 has_unmanaged_check_done = true;
3134                                 return false;
3135                         }
3136
3137                         if (first_nonstatic_field != null) {
3138                                 requires_delayed_unmanagedtype_check = true;
3139
3140                                 foreach (var member in Members) {
3141                                         var f = member as Field;
3142                                         if (f == null)
3143                                                 continue;
3144
3145                                         if (f.IsStatic)
3146                                                 continue;
3147
3148                                         // It can happen when recursive unmanaged types are defined
3149                                         // struct S { S* s; }
3150                                         TypeSpec mt = f.MemberType;
3151                                         if (mt == null) {
3152                                                 return true;
3153                                         }
3154
3155                                         if (mt.IsUnmanaged)
3156                                                 continue;
3157
3158                                         has_unmanaged_check_done = true;
3159                                         return false;
3160                                 }
3161
3162                                 has_unmanaged_check_done = true;
3163                         }
3164
3165                         is_unmanaged = true;
3166                         return true;
3167                 }
3168
3169                 protected override TypeSpec[] ResolveBaseTypes (out FullNamedExpression base_class)
3170                 {
3171                         var ifaces = base.ResolveBaseTypes (out base_class);
3172                         base_type = Compiler.BuiltinTypes.ValueType;
3173                         return ifaces;
3174                 }
3175         }
3176
3177         /// <summary>
3178         ///   Interfaces
3179         /// </summary>
3180         public sealed class Interface : TypeDefinition {
3181
3182                 /// <summary>
3183                 ///   Modifiers allowed in a class declaration
3184                 /// </summary>
3185                 const Modifiers AllowedModifiers =
3186                         Modifiers.NEW       |
3187                         Modifiers.PUBLIC    |
3188                         Modifiers.PROTECTED |
3189                         Modifiers.INTERNAL  |
3190                         Modifiers.UNSAFE    |
3191                         Modifiers.PRIVATE;
3192
3193                 public Interface (TypeContainer parent, MemberName name, Modifiers mod, Attributes attrs)
3194                         : base (parent, name, attrs, MemberKind.Interface)
3195                 {
3196                         var accmods = IsTopLevel ? Modifiers.INTERNAL : Modifiers.PRIVATE;
3197
3198                         this.ModFlags = ModifiersExtensions.Check (AllowedModifiers, mod, accmods, name.Location, Report);
3199                         spec = new TypeSpec (Kind, null, this, null, ModFlags);
3200                 }
3201
3202                 #region Properties
3203
3204                 public override AttributeTargets AttributeTargets {
3205                         get {
3206                                 return AttributeTargets.Interface;
3207                         }
3208                 }
3209
3210                 protected override TypeAttributes TypeAttr {
3211                         get {
3212                                 const TypeAttributes DefaultTypeAttributes =
3213                                         TypeAttributes.AutoLayout |
3214                                         TypeAttributes.Abstract |
3215                                         TypeAttributes.Interface;
3216
3217                                 return base.TypeAttr | DefaultTypeAttributes;
3218                         }
3219                 }
3220
3221                 #endregion
3222
3223                 public override void Accept (StructuralVisitor visitor)
3224                 {
3225                         visitor.Visit (this);
3226                 }
3227
3228                 public override void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa)
3229                 {
3230                         if (a.Type == pa.ComImport && !attributes.Contains (pa.Guid)) {
3231                                 a.Error_MissingGuidAttribute ();
3232                                 return;
3233                         }
3234
3235                         base.ApplyAttributeBuilder (a, ctor, cdata, pa);
3236                 }
3237
3238                 protected override bool VerifyClsCompliance ()
3239                 {
3240                         if (!base.VerifyClsCompliance ())
3241                                 return false;
3242
3243                         if (iface_exprs != null) {
3244                                 foreach (var iface in iface_exprs) {
3245                                         if (iface.IsCLSCompliant ())
3246                                                 continue;
3247
3248                                         Report.SymbolRelatedToPreviousError (iface);
3249                                         Report.Warning (3027, 1, Location, "`{0}' is not CLS-compliant because base interface `{1}' is not CLS-compliant",
3250                                                 GetSignatureForError (), iface.GetSignatureForError ());
3251                                 }
3252                         }
3253
3254                         return true;
3255                 }
3256         }
3257
3258         public abstract class InterfaceMemberBase : MemberBase
3259         {
3260                 //
3261                 // Common modifiers allowed in a class declaration
3262                 //
3263                 protected const Modifiers AllowedModifiersClass =
3264                         Modifiers.NEW |
3265                         Modifiers.PUBLIC |
3266                         Modifiers.PROTECTED |
3267                         Modifiers.INTERNAL |
3268                         Modifiers.PRIVATE |
3269                         Modifiers.STATIC |
3270                         Modifiers.VIRTUAL |
3271                         Modifiers.SEALED |
3272                         Modifiers.OVERRIDE |
3273                         Modifiers.ABSTRACT |
3274                         Modifiers.UNSAFE |
3275                         Modifiers.EXTERN;
3276
3277                 //
3278                 // Common modifiers allowed in a struct declaration
3279                 //
3280                 protected const Modifiers AllowedModifiersStruct =
3281                         Modifiers.NEW |
3282                         Modifiers.PUBLIC |
3283                         Modifiers.PROTECTED |
3284                         Modifiers.INTERNAL |
3285                         Modifiers.PRIVATE |
3286                         Modifiers.STATIC |
3287                         Modifiers.OVERRIDE |
3288                         Modifiers.UNSAFE |
3289                         Modifiers.EXTERN;
3290
3291                 //
3292                 // Common modifiers allowed in a interface declaration
3293                 //
3294                 protected const Modifiers AllowedModifiersInterface =
3295                         Modifiers.NEW |
3296                         Modifiers.UNSAFE;
3297
3298                 //
3299                 // Whether this is an interface member.
3300                 //
3301                 public bool IsInterface;
3302
3303                 //
3304                 // If true, this is an explicit interface implementation
3305                 //
3306                 public readonly bool IsExplicitImpl;
3307
3308                 protected bool is_external_implementation;
3309
3310                 //
3311                 // The interface type we are explicitly implementing
3312                 //
3313                 public TypeSpec InterfaceType;
3314
3315                 //
3316                 // The method we're overriding if this is an override method.
3317                 //
3318                 protected MethodSpec base_method;
3319
3320                 readonly Modifiers explicit_mod_flags;
3321                 public MethodAttributes flags;
3322
3323                 protected InterfaceMemberBase (TypeDefinition parent, FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, MemberName name, Attributes attrs)
3324                         : base (parent, type, mod, allowed_mod, Modifiers.PRIVATE, name, attrs)
3325                 {
3326                         IsInterface = parent.Kind == MemberKind.Interface;
3327                         IsExplicitImpl = (MemberName.ExplicitInterface != null);
3328                         explicit_mod_flags = mod;
3329                 }
3330
3331                 public abstract Variance ExpectedMemberTypeVariance { get; }
3332
3333                 protected override bool CheckBase ()
3334                 {
3335                         if (!base.CheckBase ())
3336                                 return false;
3337
3338                         if ((caching_flags & Flags.MethodOverloadsExist) != 0)
3339                                 CheckForDuplications ();
3340
3341                         if (IsExplicitImpl)
3342                                 return true;
3343
3344                         // For System.Object only
3345                         if (Parent.BaseType == null)
3346                                 return true;
3347
3348                         MemberSpec candidate;
3349                         bool overrides = false;
3350                         var base_member = FindBaseMember (out candidate, ref overrides);
3351
3352                         if ((ModFlags & Modifiers.OVERRIDE) != 0) {
3353                                 if (base_member == null) {
3354                                         if (candidate == null) {
3355                                                 if (this is Method && ((Method)this).ParameterInfo.IsEmpty && MemberName.Name == Destructor.MetadataName && MemberName.Arity == 0) {
3356                                                         Report.Error (249, Location, "Do not override `{0}'. Use destructor syntax instead",
3357                                                                 "object.Finalize()");
3358                                                 } else {
3359                                                         Report.Error (115, Location, "`{0}' is marked as an override but no suitable {1} found to override",
3360                                                                 GetSignatureForError (), SimpleName.GetMemberType (this));
3361                                                 }
3362                                         } else {
3363                                                 Report.SymbolRelatedToPreviousError (candidate);
3364                                                 if (this is Event)
3365                                                         Report.Error (72, Location, "`{0}': cannot override because `{1}' is not an event",
3366                                                                 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
3367                                                 else if (this is PropertyBase)
3368                                                         Report.Error (544, Location, "`{0}': cannot override because `{1}' is not a property",
3369                                                                 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
3370                                                 else
3371                                                         Report.Error (505, Location, "`{0}': cannot override because `{1}' is not a method",
3372                                                                 GetSignatureForError (), TypeManager.GetFullNameSignature (candidate));
3373                                         }
3374
3375                                         return false;
3376                                 }
3377
3378                                 //
3379                                 // Handles ambiguous overrides
3380                                 //
3381                                 if (candidate != null) {
3382                                         Report.SymbolRelatedToPreviousError (candidate);
3383                                         Report.SymbolRelatedToPreviousError (base_member);
3384
3385                                         // Get member definition for error reporting
3386                                         var m1 = MemberCache.GetMember (base_member.DeclaringType.GetDefinition (), base_member);
3387                                         var m2 = MemberCache.GetMember (candidate.DeclaringType.GetDefinition (), candidate);
3388
3389                                         Report.Error (462, Location,
3390                                                 "`{0}' cannot override inherited members `{1}' and `{2}' because they have the same signature when used in type `{3}'",
3391                                                 GetSignatureForError (), m1.GetSignatureForError (), m2.GetSignatureForError (), Parent.GetSignatureForError ());
3392                                 }
3393
3394                                 if (!CheckOverrideAgainstBase (base_member))
3395                                         return false;
3396
3397                                 ObsoleteAttribute oa = base_member.GetAttributeObsolete ();
3398                                 if (oa != null) {
3399                                         if (OptAttributes == null || !OptAttributes.Contains (Module.PredefinedAttributes.Obsolete)) {
3400                                                 Report.SymbolRelatedToPreviousError (base_member);
3401                                                 Report.Warning (672, 1, Location, "Member `{0}' overrides obsolete member `{1}'. Add the Obsolete attribute to `{0}'",
3402                                                         GetSignatureForError (), base_member.GetSignatureForError ());
3403                                         }
3404                                 } else {
3405                                         if (OptAttributes != null && OptAttributes.Contains (Module.PredefinedAttributes.Obsolete)) {
3406                                                 Report.SymbolRelatedToPreviousError (base_member);
3407                                                 Report.Warning (809, 1, Location, "Obsolete member `{0}' overrides non-obsolete member `{1}'",
3408                                                         GetSignatureForError (), base_member.GetSignatureForError ());
3409                                         }
3410                                 }
3411
3412                                 base_method = base_member as MethodSpec;
3413                                 return true;
3414                         }
3415
3416                         if (base_member == null && candidate != null && (!(candidate is IParametersMember) || !(this is IParametersMember)))
3417                                 base_member = candidate;
3418
3419                         if (base_member == null) {
3420                                 if ((ModFlags & Modifiers.NEW) != 0) {
3421                                         if (base_member == null) {
3422                                                 Report.Warning (109, 4, Location, "The member `{0}' does not hide an inherited member. The new keyword is not required",
3423                                                         GetSignatureForError ());
3424                                         }
3425                                 }
3426                         } else {
3427                                 if ((ModFlags & Modifiers.NEW) == 0) {
3428                                         ModFlags |= Modifiers.NEW;
3429                                         if (!IsCompilerGenerated) {
3430                                                 Report.SymbolRelatedToPreviousError (base_member);
3431                                                 if ((base_member.Kind & MemberKind.NestedMask) == 0 && !IsInterface && (base_member.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE)) != 0) {
3432                                                         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",
3433                                                                 GetSignatureForError (), base_member.GetSignatureForError ());
3434                                                 } else {
3435                                                         Report.Warning (108, 2, Location, "`{0}' hides inherited member `{1}'. Use the new keyword if hiding was intended",
3436                                                                 GetSignatureForError (), base_member.GetSignatureForError ());
3437                                                 }
3438                                         }
3439                                 }
3440
3441                                 if (!IsInterface && base_member.IsAbstract && !overrides && !IsStatic) {
3442                                         switch (base_member.Kind) {
3443                                         case MemberKind.Event:
3444                                         case MemberKind.Indexer:
3445                                         case MemberKind.Method:
3446                                         case MemberKind.Property:
3447                                                 Report.SymbolRelatedToPreviousError (base_member);
3448                                                 Report.Error (533, Location, "`{0}' hides inherited abstract member `{1}'",
3449                                                         GetSignatureForError (), base_member.GetSignatureForError ());
3450                                                 break;
3451                                         }
3452                                 }
3453                         }
3454
3455                         return true;
3456                 }
3457
3458                 protected virtual bool CheckForDuplications ()
3459                 {
3460                         return Parent.MemberCache.CheckExistingMembersOverloads (this, ParametersCompiled.EmptyReadOnlyParameters);
3461                 }
3462
3463                 //
3464                 // Performs various checks on the MethodInfo `mb' regarding the modifier flags
3465                 // that have been defined.
3466                 //
3467                 protected virtual bool CheckOverrideAgainstBase (MemberSpec base_member)
3468                 {
3469                         bool ok = true;
3470
3471                         if ((base_member.Modifiers & (Modifiers.ABSTRACT | Modifiers.VIRTUAL | Modifiers.OVERRIDE)) == 0) {
3472                                 Report.SymbolRelatedToPreviousError (base_member);
3473                                 Report.Error (506, Location,
3474                                         "`{0}': cannot override inherited member `{1}' because it is not marked virtual, abstract or override",
3475                                          GetSignatureForError (), TypeManager.CSharpSignature (base_member));
3476                                 ok = false;
3477                         }
3478
3479                         // Now we check that the overriden method is not final
3480                         if ((base_member.Modifiers & Modifiers.SEALED) != 0) {
3481                                 Report.SymbolRelatedToPreviousError (base_member);
3482                                 Report.Error (239, Location, "`{0}': cannot override inherited member `{1}' because it is sealed",
3483                                                           GetSignatureForError (), TypeManager.CSharpSignature (base_member));
3484                                 ok = false;
3485                         }
3486
3487                         var base_member_type = ((IInterfaceMemberSpec) base_member).MemberType;
3488                         if (!TypeSpecComparer.Override.IsEqual (MemberType, base_member_type)) {
3489                                 Report.SymbolRelatedToPreviousError (base_member);
3490                                 if (this is PropertyBasedMember) {
3491                                         Report.Error (1715, Location, "`{0}': type must be `{1}' to match overridden member `{2}'",
3492                                                 GetSignatureForError (), base_member_type.GetSignatureForError (), base_member.GetSignatureForError ());
3493                                 } else {
3494                                         Report.Error (508, Location, "`{0}': return type must be `{1}' to match overridden member `{2}'",
3495                                                 GetSignatureForError (), base_member_type.GetSignatureForError (), base_member.GetSignatureForError ());
3496                                 }
3497                                 ok = false;
3498                         }
3499
3500                         return ok;
3501                 }
3502
3503                 protected static bool CheckAccessModifiers (MemberCore this_member, MemberSpec base_member)
3504                 {
3505                         var thisp = this_member.ModFlags & Modifiers.AccessibilityMask;
3506                         var base_classp = base_member.Modifiers & Modifiers.AccessibilityMask;
3507
3508                         if ((base_classp & (Modifiers.PROTECTED | Modifiers.INTERNAL)) == (Modifiers.PROTECTED | Modifiers.INTERNAL)) {
3509                                 //
3510                                 // It must be at least "protected"
3511                                 //
3512                                 if ((thisp & Modifiers.PROTECTED) == 0) {
3513                                         return false;
3514                                 }
3515
3516                                 //
3517                                 // when overriding protected internal, the method can be declared
3518                                 // protected internal only within the same assembly or assembly
3519                                 // which has InternalsVisibleTo
3520                                 //
3521                                 if ((thisp & Modifiers.INTERNAL) != 0) {
3522                                         return base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (this_member.Module.DeclaringAssembly);
3523                                 }
3524
3525                                 //
3526                                 // protected overriding protected internal inside same assembly
3527                                 // requires internal modifier as well
3528                                 //
3529                                 if (base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (this_member.Module.DeclaringAssembly)) {
3530                                         return false;
3531                                 }
3532
3533                                 return true;
3534                         }
3535
3536                         return thisp == base_classp;
3537                 }
3538
3539                 public override bool Define ()
3540                 {
3541                         if (IsInterface) {
3542                                 ModFlags = Modifiers.PUBLIC | Modifiers.ABSTRACT |
3543                                         Modifiers.VIRTUAL | (ModFlags & (Modifiers.UNSAFE | Modifiers.NEW));
3544
3545                                 flags = MethodAttributes.Public |
3546                                         MethodAttributes.Abstract |
3547                                         MethodAttributes.HideBySig |
3548                                         MethodAttributes.NewSlot |
3549                                         MethodAttributes.Virtual;
3550                         } else {
3551                                 Parent.PartialContainer.MethodModifiersValid (this);
3552
3553                                 flags = ModifiersExtensions.MethodAttr (ModFlags);
3554                         }
3555
3556                         if (IsExplicitImpl) {
3557                                 InterfaceType = MemberName.ExplicitInterface.ResolveAsType (Parent);
3558                                 if (InterfaceType == null)
3559                                         return false;
3560
3561                                 if ((ModFlags & Modifiers.PARTIAL) != 0) {
3562                                         Report.Error (754, Location, "A partial method `{0}' cannot explicitly implement an interface",
3563                                                 GetSignatureForError ());
3564                                 }
3565
3566                                 if (!InterfaceType.IsInterface) {
3567                                         Report.SymbolRelatedToPreviousError (InterfaceType);
3568                                         Report.Error (538, Location, "The type `{0}' in explicit interface declaration is not an interface",
3569                                                 InterfaceType.GetSignatureForError ());
3570                                 } else {
3571                                         Parent.PartialContainer.VerifyImplements (this);
3572                                 }
3573
3574                                 Modifiers allowed_explicit = Modifiers.AllowedExplicitImplFlags;
3575                                 if (this is Method)
3576                                         allowed_explicit |= Modifiers.ASYNC;
3577
3578                                 ModifiersExtensions.Check (allowed_explicit, explicit_mod_flags, 0, Location, Report);
3579                         }
3580
3581                         return base.Define ();
3582                 }
3583
3584                 protected bool DefineParameters (ParametersCompiled parameters)
3585                 {
3586                         if (!parameters.Resolve (this))
3587                                 return false;
3588
3589                         bool error = false;
3590                         for (int i = 0; i < parameters.Count; ++i) {
3591                                 Parameter p = parameters [i];
3592
3593                                 if (p.HasDefaultValue && (IsExplicitImpl || this is Operator || (this is Indexer && parameters.Count == 1)))
3594                                         p.Warning_UselessOptionalParameter (Report);
3595
3596                                 if (p.CheckAccessibility (this))
3597                                         continue;
3598
3599                                 TypeSpec t = parameters.Types [i];
3600                                 Report.SymbolRelatedToPreviousError (t);
3601                                 if (this is Indexer)
3602                                         Report.Error (55, Location,
3603                                                       "Inconsistent accessibility: parameter type `{0}' is less accessible than indexer `{1}'",
3604                                                       t.GetSignatureForError (), GetSignatureForError ());
3605                                 else if (this is Operator)
3606                                         Report.Error (57, Location,
3607                                                       "Inconsistent accessibility: parameter type `{0}' is less accessible than operator `{1}'",
3608                                                       t.GetSignatureForError (), GetSignatureForError ());
3609                                 else
3610                                         Report.Error (51, Location,
3611                                                 "Inconsistent accessibility: parameter type `{0}' is less accessible than method `{1}'",
3612                                                 t.GetSignatureForError (), GetSignatureForError ());
3613                                 error = true;
3614                         }
3615                         return !error;
3616                 }
3617
3618                 protected override void DoMemberTypeDependentChecks ()
3619                 {
3620                         base.DoMemberTypeDependentChecks ();
3621
3622                         VarianceDecl.CheckTypeVariance (MemberType, ExpectedMemberTypeVariance, this);
3623                 }
3624
3625                 public override void Emit()
3626                 {
3627                         // for extern static method must be specified either DllImport attribute or MethodImplAttribute.
3628                         // We are more strict than csc and report this as an error because SRE does not allow emit that
3629                         if ((ModFlags & Modifiers.EXTERN) != 0 && !is_external_implementation && (OptAttributes == null || !OptAttributes.HasResolveError ())) {
3630                                 if (this is Constructor) {
3631                                         Report.Warning (824, 1, Location,
3632                                                 "Constructor `{0}' is marked `external' but has no external implementation specified", GetSignatureForError ());
3633                                 } else {
3634                                         Report.Warning (626, 1, Location,
3635                                                 "`{0}' is marked as an external but has no DllImport attribute. Consider adding a DllImport attribute to specify the external implementation",
3636                                                 GetSignatureForError ());
3637                                 }
3638                         }
3639
3640                         base.Emit ();
3641                 }
3642
3643                 public override bool EnableOverloadChecks (MemberCore overload)
3644                 {
3645                         //
3646                         // Two members can differ in their explicit interface
3647                         // type parameter only
3648                         //
3649                         InterfaceMemberBase imb = overload as InterfaceMemberBase;
3650                         if (imb != null && imb.IsExplicitImpl) {
3651                                 if (IsExplicitImpl) {
3652                                         caching_flags |= Flags.MethodOverloadsExist;
3653                                 }
3654                                 return true;
3655                         }
3656
3657                         return IsExplicitImpl;
3658                 }
3659
3660                 protected void Error_CannotChangeAccessModifiers (MemberCore member, MemberSpec base_member)
3661                 {
3662                         var base_modifiers = base_member.Modifiers;
3663
3664                         // Remove internal modifier from types which are not internally accessible
3665                         if ((base_modifiers & Modifiers.AccessibilityMask) == (Modifiers.PROTECTED | Modifiers.INTERNAL) &&
3666                                 !base_member.DeclaringType.MemberDefinition.IsInternalAsPublic (member.Module.DeclaringAssembly))
3667                                 base_modifiers = Modifiers.PROTECTED;
3668
3669                         Report.SymbolRelatedToPreviousError (base_member);
3670                         Report.Error (507, member.Location,
3671                                 "`{0}': cannot change access modifiers when overriding `{1}' inherited member `{2}'",
3672                                 member.GetSignatureForError (),
3673                                 ModifiersExtensions.AccessibilityName (base_modifiers),
3674                                 base_member.GetSignatureForError ());
3675                 }
3676
3677                 protected void Error_StaticReturnType ()
3678                 {
3679                         Report.Error (722, Location,
3680                                 "`{0}': static types cannot be used as return types",
3681                                 MemberType.GetSignatureForError ());
3682                 }
3683
3684                 /// <summary>
3685                 /// Gets base method and its return type
3686                 /// </summary>
3687                 protected virtual MemberSpec FindBaseMember (out MemberSpec bestCandidate, ref bool overrides)
3688                 {
3689                         return MemberCache.FindBaseMember (this, out bestCandidate, ref overrides);
3690                 }
3691
3692                 //
3693                 // The "short" name of this property / indexer / event.  This is the
3694                 // name without the explicit interface.
3695                 //
3696                 public string ShortName {
3697                         get { return MemberName.Name; }
3698                 }
3699
3700                 //
3701                 // Returns full metadata method name
3702                 //
3703                 public string GetFullName (MemberName name)
3704                 {
3705                         return GetFullName (name.Name);
3706                 }
3707
3708                 public string GetFullName (string name)
3709                 {
3710                         if (!IsExplicitImpl)
3711                                 return name;
3712
3713                         //
3714                         // When dealing with explicit members a full interface type
3715                         // name is added to member name to avoid possible name conflicts
3716                         //
3717                         // We use CSharpName which gets us full name with benefit of
3718                         // replacing predefined names which saves some space and name
3719                         // is still unique
3720                         //
3721                         return InterfaceType.GetSignatureForError () + "." + name;
3722                 }
3723
3724                 public override string GetSignatureForDocumentation ()
3725                 {
3726                         if (IsExplicitImpl)
3727                                 return Parent.GetSignatureForDocumentation () + "." + InterfaceType.GetSignatureForDocumentation (true) + "#" + ShortName;
3728
3729                         return Parent.GetSignatureForDocumentation () + "." + ShortName;
3730                 }
3731
3732                 public override bool IsUsed
3733                 {
3734                         get { return IsExplicitImpl || base.IsUsed; }
3735                 }
3736
3737                 public override void SetConstraints (List<Constraints> constraints_list)
3738                 {
3739                         if (((ModFlags & Modifiers.OVERRIDE) != 0 || IsExplicitImpl)) {
3740                                 Report.Error (460, Location,
3741                                         "`{0}': Cannot specify constraints for overrides and explicit interface implementation methods",
3742                                         GetSignatureForError ());
3743                         }
3744
3745                         base.SetConstraints (constraints_list);
3746                 }
3747         }
3748
3749         public abstract class MemberBase : MemberCore
3750         {
3751                 protected FullNamedExpression type_expr;
3752                 protected TypeSpec member_type;
3753                 public new TypeDefinition Parent;
3754
3755                 protected MemberBase (TypeDefinition parent, FullNamedExpression type, Modifiers mod, Modifiers allowed_mod, Modifiers def_mod, MemberName name, Attributes attrs)
3756                         : base (parent, name, attrs)
3757                 {
3758                         this.Parent = parent;
3759                         this.type_expr = type;
3760
3761                         if (name != MemberName.Null)
3762                                 ModFlags = ModifiersExtensions.Check (allowed_mod, mod, def_mod, Location, Report);
3763                 }
3764
3765                 #region Properties
3766
3767                 public TypeSpec MemberType {
3768                         get {
3769                                 return member_type;
3770                         }
3771                 }
3772
3773                 public FullNamedExpression TypeExpression {
3774                         get {
3775                                 return type_expr;
3776                         }
3777                         set {
3778                                 type_expr = value;
3779                         }
3780                 }
3781
3782                 #endregion
3783
3784                 //
3785                 // Main member define entry
3786                 //
3787                 public override bool Define ()
3788                 {
3789                         DoMemberTypeIndependentChecks ();
3790
3791                         //
3792                         // Returns false only when type resolution failed
3793                         //
3794                         if (!ResolveMemberType ())
3795                                 return false;
3796
3797                         DoMemberTypeDependentChecks ();
3798                         return true;
3799                 }
3800
3801                 //
3802                 // Any type_name independent checks
3803                 //
3804                 protected virtual void DoMemberTypeIndependentChecks ()
3805                 {
3806                         if ((Parent.ModFlags & Modifiers.SEALED) != 0 &&
3807                                 (ModFlags & (Modifiers.VIRTUAL | Modifiers.ABSTRACT)) != 0) {
3808                                 Report.Error (549, Location, "New virtual member `{0}' is declared in a sealed class `{1}'",
3809                                         GetSignatureForError (), Parent.GetSignatureForError ());
3810                         }
3811                 }
3812
3813                 //
3814                 // Any type_name dependent checks
3815                 //
3816                 protected virtual void DoMemberTypeDependentChecks ()
3817                 {
3818                         // verify accessibility
3819                         if (!IsAccessibleAs (MemberType)) {
3820                                 Report.SymbolRelatedToPreviousError (MemberType);
3821                                 if (this is Property)
3822                                         Report.Error (53, Location,
3823                                                 "Inconsistent accessibility: property type `" +
3824                                                 MemberType.GetSignatureForError () + "' is less " +
3825                                                 "accessible than property `" + GetSignatureForError () + "'");
3826                                 else if (this is Indexer)
3827                                         Report.Error (54, Location,
3828                                                 "Inconsistent accessibility: indexer return type `" +
3829                                                 MemberType.GetSignatureForError () + "' is less " +
3830                                                 "accessible than indexer `" + GetSignatureForError () + "'");
3831                                 else if (this is MethodCore) {
3832                                         if (this is Operator)
3833                                                 Report.Error (56, Location,
3834                                                         "Inconsistent accessibility: return type `" +
3835                                                         MemberType.GetSignatureForError () + "' is less " +
3836                                                         "accessible than operator `" + GetSignatureForError () + "'");
3837                                         else
3838                                                 Report.Error (50, Location,
3839                                                         "Inconsistent accessibility: return type `" +
3840                                                         MemberType.GetSignatureForError () + "' is less " +
3841                                                         "accessible than method `" + GetSignatureForError () + "'");
3842                                 } else if (this is Event) {
3843                                         Report.Error (7025, Location,
3844                                                 "Inconsistent accessibility: event type `{0}' is less accessible than event `{1}'",
3845                                                 MemberType.GetSignatureForError (), GetSignatureForError ());
3846                                 } else {
3847                                         Report.Error (52, Location,
3848                                                       "Inconsistent accessibility: field type `" +
3849                                                       MemberType.GetSignatureForError () + "' is less " +
3850                                                       "accessible than field `" + GetSignatureForError () + "'");
3851                                 }
3852                         }
3853                 }
3854
3855                 protected void IsTypePermitted ()
3856                 {
3857                         if (MemberType.IsSpecialRuntimeType) {
3858                                 if (Parent is StateMachine) {
3859                                         Report.Error (4012, Location,
3860                                                 "Parameters or local variables of type `{0}' cannot be declared in async methods or iterators",
3861                                                 MemberType.GetSignatureForError ());
3862                                 } else if (Parent is HoistedStoreyClass) {
3863                                         Report.Error (4013, Location,
3864                                                 "Local variables of type `{0}' cannot be used inside anonymous methods, lambda expressions or query expressions",
3865                                                 MemberType.GetSignatureForError ());
3866                                 } else {
3867                                         Report.Error (610, Location,
3868                                                 "Field or property cannot be of type `{0}'", MemberType.GetSignatureForError ());
3869                                 }
3870                         }
3871                 }
3872
3873                 protected virtual bool CheckBase ()
3874                 {
3875                         CheckProtectedModifier ();
3876
3877                         return true;
3878                 }
3879
3880                 public override string GetSignatureForDocumentation ()
3881                 {
3882                         return Parent.GetSignatureForDocumentation () + "." + MemberName.Basename;
3883                 }
3884
3885                 public virtual void PrepareEmit ()
3886                 {
3887                         if (member_type != null && type_expr != null)
3888                                 member_type.CheckObsoleteness (this, type_expr.Location);
3889                 }
3890
3891                 protected virtual bool ResolveMemberType ()
3892                 {
3893                         if (member_type != null)
3894                                 throw new InternalErrorException ("Multi-resolve");
3895
3896                         member_type = type_expr.ResolveAsType (this);
3897                         return member_type != null;
3898                 }
3899         }
3900 }
3901