mcs/mcs/decl.cs

   1 //
   2 // decl.cs: Declaration base class for structs, classes, enums and interfaces.
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10 // (C) 2004 Novell, Inc
  11 //
  12 // TODO: Move the method verification stuff from the class.cs and interface.cs here
  13 //
  14
  15 using System;
  16 using System.Text;
  17 using System.Collections;
  18 using System.Globalization;
  19 using System.Reflection.Emit;
  20 using System.Reflection;
  21
  22 #if BOOTSTRAP_WITH_OLDLIB || NET_2_1
  23 using XmlElement = System.Object;
  24 #else
  25 using System.Xml;
  26 #endif
  27
  28 namespace Mono.CSharp {
  29
  30         public class MemberName {
  31                 public readonly string Name;
  32                 public readonly TypeArguments TypeArguments;
  33
  34                 public readonly MemberName Left;
  35                 public readonly Location Location;
  36
  37                 public static readonly MemberName Null = new MemberName ("");
  38
  39                 bool is_double_colon;
  40
  41                 private MemberName (MemberName left, string name, bool is_double_colon,
  42                                     Location loc)
  43                 {
  44                         this.Name = name;
  45                         this.Location = loc;
  46                         this.is_double_colon = is_double_colon;
  47                         this.Left = left;
  48                 }
  49
  50                 private MemberName (MemberName left, string name, bool is_double_colon,
  51                                     TypeArguments args, Location loc)
  52                         : this (left, name, is_double_colon, loc)
  53                 {
  54                         if (args != null && args.Count > 0)
  55                                 this.TypeArguments = args;
  56                 }
  57
  58                 public MemberName (string name)
  59                         : this (name, Location.Null)
  60                 { }
  61
  62                 public MemberName (string name, Location loc)
  63                         : this (null, name, false, loc)
  64                 { }
  65
  66                 public MemberName (string name, TypeArguments args, Location loc)
  67                         : this (null, name, false, args, loc)
  68                 { }
  69
  70                 public MemberName (MemberName left, string name)
  71                         : this (left, name, left != null ? left.Location : Location.Null)
  72                 { }
  73
  74                 public MemberName (MemberName left, string name, Location loc)
  75                         : this (left, name, false, loc)
  76                 { }
  77
  78                 public MemberName (MemberName left, string name, TypeArguments args, Location loc)
  79                         : this (left, name, false, args, loc)
  80                 { }
  81
  82                 public MemberName (string alias, string name, TypeArguments args, Location loc)
  83                         : this (new MemberName (alias, loc), name, true, args, loc)
  84                 { }
  85
  86                 public MemberName (MemberName left, MemberName right)
  87                         : this (left, right, right.Location)
  88                 { }
  89
  90                 public MemberName (MemberName left, MemberName right, Location loc)
  91                         : this (null, right.Name, false, right.TypeArguments, loc)
  92                 {
  93                         if (right.is_double_colon)
  94                                 throw new InternalErrorException ("Cannot append double_colon member name");
  95                         this.Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  96                 }
  97
  98                 public string GetName ()
  99                 {
 100                         return GetName (false);
 101                 }
 102
 103                 public bool IsGeneric {
 104                         get {
 105                                 if (TypeArguments != null)
 106                                         return true;
 107                                 else if (Left != null)
 108                                         return Left.IsGeneric;
 109                                 else
 110                                         return false;
 111                         }
 112                 }
 113
 114                 public string GetName (bool is_generic)
 115                 {
 116                         string name = is_generic ? Basename : Name;
 117                         string connect = is_double_colon ? "::" : ".";
 118                         if (Left != null)
 119                                 return Left.GetName (is_generic) + connect + name;
 120                         else
 121                                 return name;
 122                 }
 123
 124                 public string GetTypeName ()
 125                 {
 126                         string connect = is_double_colon ? "::" : ".";
 127                         if (Left != null)
 128                                 return Left.GetTypeName () + connect + MakeName (Name, TypeArguments);
 129                         else
 130                                 return MakeName (Name, TypeArguments);
 131                 }
 132
 133                 public Expression GetTypeExpression ()
 134                 {
 135                         if (Left == null) {
 136                                 if (TypeArguments != null)
 137                                         return new SimpleName (Basename, TypeArguments, Location);
 138
 139                                 return new SimpleName (Name, Location);
 140                         }
 141
 142                         if (is_double_colon) {
 143                                 if (Left.Left != null)
 144                                         throw new InternalErrorException ("The left side of a :: should be an identifier");
 145                                 return new QualifiedAliasMember (Left.Name, Basename, Location);
 146                         }
 147
 148                         Expression lexpr = Left.GetTypeExpression ();
 149                         return new MemberAccess (lexpr, Name, TypeArguments, Location);
 150                 }
 151
 152                 public MemberName Clone ()
 153                 {
 154                         MemberName left_clone = Left == null ? null : Left.Clone ();
 155                         return new MemberName (left_clone, Name, is_double_colon, TypeArguments, Location);
 156                 }
 157
 158                 public string Basename {
 159                         get {
 160                                 if (TypeArguments != null)
 161                                         return MakeName (Name, TypeArguments);
 162                                 else
 163                                         return Name;
 164                         }
 165                 }
 166
 167                 public string FullName {
 168                         get {
 169                                 if (TypeArguments != null)
 170                                         return Name + "<" + TypeArguments + ">";
 171                                 else
 172                                         return Name;
 173                         }
 174                 }
 175
 176                 public string MethodName {
 177                         get {
 178                                 string connect = is_double_colon ? "::" : ".";
 179                                 if (Left != null)
 180                                         return Left.FullName + connect + Name;
 181                                 else
 182                                         return Name;
 183                         }
 184                 }
 185
 186                 public string GetSignatureForError ()
 187                 {
 188                         if (TypeArguments != null)
 189                                 return MethodName + "<" + TypeArguments.GetSignatureForError () + ">";
 190
 191                         return MethodName;
 192                 }
 193
 194                 public override bool Equals (object other)
 195                 {
 196                         return Equals (other as MemberName);
 197                 }
 198
 199                 public bool Equals (MemberName other)
 200                 {
 201                         if (this == other)
 202                                 return true;
 203                         if (other == null || Name != other.Name)
 204                                 return false;
 205                         if (is_double_colon != other.is_double_colon)
 206                                 return false;
 207
 208                         if ((TypeArguments != null) &&
 209                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 210                                 return false;
 211
 212                         if ((TypeArguments == null) && (other.TypeArguments != null))
 213                                 return false;
 214
 215                         if (Left == null)
 216                                 return other.Left == null;
 217
 218                         return Left.Equals (other.Left);
 219                 }
 220
 221                 public override int GetHashCode ()
 222                 {
 223                         int hash = Name.GetHashCode ();
 224                         for (MemberName n = Left; n != null; n = n.Left)
 225                                 hash ^= n.Name.GetHashCode ();
 226                         if (is_double_colon)
 227                                 hash ^= 0xbadc01d;
 228
 229                         if (TypeArguments != null)
 230                                 hash ^= TypeArguments.Count << 5;
 231
 232                         return hash & 0x7FFFFFFF;
 233                 }
 234
 235                 public int CountTypeArguments {
 236                         get {
 237                                 if (TypeArguments != null)
 238                                         return TypeArguments.Count;
 239                                 else if (Left != null)
 240                                         return Left.CountTypeArguments;
 241                                 else
 242                                         return 0;
 243                         }
 244                 }
 245
 246                 public static string MakeName (string name, TypeArguments args)
 247                 {
 248                         if (args == null)
 249                                 return name;
 250                         else
 251                                 return name + "`" + args.Count;
 252                 }
 253
 254                 public static string MakeName (string name, int count)
 255                 {
 256                         return name + "`" + count;
 257                 }
 258         }
 259
 260         /// <summary>
 261         ///   Base representation for members.  This is used to keep track
 262         ///   of Name, Location and Modifier flags, and handling Attributes.
 263         /// </summary>
 264         public abstract class MemberCore : Attributable, IResolveContext {
 265                 /// <summary>
 266                 ///   Public name
 267                 /// </summary>
 268
 269                 protected string cached_name;
 270                 public string Name {
 271                         get {
 272                                 if (cached_name == null)
 273                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 274                                 return cached_name;
 275                         }
 276                 }
 277
 278                 // Is not readonly because of IndexerName attribute
 279                 private MemberName member_name;
 280                 public MemberName MemberName {
 281                         get { return member_name; }
 282                 }
 283
 284                 /// <summary>
 285                 ///   Modifier flags that the user specified in the source code
 286                 /// </summary>
 287                 private int mod_flags;
 288                 public int ModFlags {
 289                         set {
 290                                 mod_flags = value;
 291                                 if ((value & Modifiers.COMPILER_GENERATED) != 0)
 292                                         caching_flags = Flags.IsUsed | Flags.IsAssigned;
 293                         }
 294                         get {
 295                                 return mod_flags;
 296                         }
 297                 }
 298
 299                 public /*readonly*/ DeclSpace Parent;
 300
 301                 /// <summary>
 302                 ///   Location where this declaration happens
 303                 /// </summary>
 304                 public Location Location {
 305                         get { return member_name.Location; }
 306                 }
 307
 308                 /// <summary>
 309                 ///   XML documentation comment
 310                 /// </summary>
 311                 protected string comment;
 312
 313                 /// <summary>
 314                 ///   Represents header string for documentation comment
 315                 ///   for each member types.
 316                 /// </summary>
 317                 public abstract string DocCommentHeader { get; }
 318
 319                 [Flags]
 320                 public enum Flags {
 321                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 322                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 323                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 324                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 325                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 326                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 327                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 328                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 329                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 330                         Excluded = 1 << 9,                                      // Method is conditional
 331                         MethodOverloadsExist = 1 << 10,         // Test for duplication must be performed
 332                         IsUsed = 1 << 11,
 333                         IsAssigned = 1 << 12,                           // Field is assigned
 334                         HasExplicitLayout       = 1 << 13,
 335                         PartialDefinitionExists = 1 << 14       // Set when corresponding partial method definition exists
 336                 }
 337
 338                 /// <summary>
 339                 ///   MemberCore flags at first detected then cached
 340                 /// </summary>
 341                 internal Flags caching_flags;
 342
 343                 public MemberCore (DeclSpace parent, MemberName name, Attributes attrs)
 344                         : base (attrs)
 345                 {
 346                         this.Parent = parent;
 347                         member_name = name;
 348                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 349                 }
 350
 351                 protected virtual void SetMemberName (MemberName new_name)
 352                 {
 353                         member_name = new_name;
 354                         cached_name = null;
 355                 }
 356
 357                 protected bool CheckAbstractAndExtern (bool has_block)
 358                 {
 359                         if (Parent.PartialContainer.Kind == Kind.Interface)
 360                                 return true;
 361
 362                         if (has_block) {
 363                                 if ((ModFlags & Modifiers.EXTERN) != 0) {
 364                                         Report.Error (179, Location, "`{0}' cannot declare a body because it is marked extern",
 365                                                 GetSignatureForError ());
 366                                         return false;
 367                                 }
 368
 369                                 if ((ModFlags & Modifiers.ABSTRACT) != 0) {
 370                                         Report.Error (500, Location, "`{0}' cannot declare a body because it is marked abstract",
 371                                                 GetSignatureForError ());
 372                                         return false;
 373                                 }
 374                         } else {
 375                                 if ((ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN | Modifiers.PARTIAL)) == 0) {
 376                                         if (RootContext.Version >= LanguageVersion.LINQ && this is Property.PropertyMethod) {
 377                                                 Report.Error (840, Location, "`{0}' must have a body because it is not marked abstract or extern. The property can be automatically implemented when you define both accessors",
 378                                                               GetSignatureForError ());
 379                                         } else {
 380                                                 Report.Error (501, Location, "`{0}' must have a body because it is not marked abstract, extern, or partial",
 381                                                               GetSignatureForError ());
 382                                         }
 383                                         return false;
 384                                 }
 385                         }
 386
 387                         return true;
 388                 }
 389
 390                 public abstract bool Define ();
 391
 392                 public virtual string DocComment {
 393                         get {
 394                                 return comment;
 395                         }
 396                         set {
 397                                 comment = value;
 398                         }
 399                 }
 400
 401                 //
 402                 // Returns full member name for error message
 403                 //
 404                 public virtual string GetSignatureForError ()
 405                 {
 406                         if (Parent == null || Parent.Parent == null)
 407                                 return member_name.GetSignatureForError ();
 408
 409                         return Parent.GetSignatureForError () + "." + member_name.GetSignatureForError ();
 410                 }
 411
 412                 /// <summary>
 413                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 414                 /// </summary>
 415                 public virtual void Emit ()
 416                 {
 417                         if (!RootContext.VerifyClsCompliance)
 418                                 return;
 419
 420                         VerifyClsCompliance ();
 421                 }
 422
 423                 public virtual bool IsUsed {
 424                         get { return (caching_flags & Flags.IsUsed) != 0; }
 425                 }
 426
 427                 public void SetMemberIsUsed ()
 428                 {
 429                         caching_flags |= Flags.IsUsed;
 430                 }
 431
 432                 /// <summary>
 433                 /// Returns instance of ObsoleteAttribute for this MemberCore
 434                 /// </summary>
 435                 public virtual ObsoleteAttribute GetObsoleteAttribute ()
 436                 {
 437                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 438                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 439                                 return null;
 440                         }
 441
 442                         caching_flags &= ~Flags.Obsolete_Undetected;
 443
 444                         if (OptAttributes == null)
 445                                 return null;
 446
 447                         Attribute obsolete_attr = OptAttributes.Search (
 448                                 TypeManager.obsolete_attribute_type);
 449                         if (obsolete_attr == null)
 450                                 return null;
 451
 452                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute ();
 453                         if (obsolete == null)
 454                                 return null;
 455
 456                         caching_flags |= Flags.Obsolete;
 457                         return obsolete;
 458                 }
 459
 460                 /// <summary>
 461                 /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
 462                 /// </summary>
 463                 public virtual void CheckObsoleteness (Location loc)
 464                 {
 465                         if (Parent != null)
 466                                 Parent.CheckObsoleteness (loc);
 467
 468                         ObsoleteAttribute oa = GetObsoleteAttribute ();
 469                         if (oa == null) {
 470                                 return;
 471                         }
 472
 473                         AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc);
 474                 }
 475
 476                 /// <summary>
 477                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 478                 /// </summary>
 479                 public override bool IsClsComplianceRequired ()
 480                 {
 481                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 482                                 return (caching_flags & Flags.ClsCompliant) != 0;
 483
 484                         if (GetClsCompliantAttributeValue () && IsExposedFromAssembly ()) {
 485                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 486                                 caching_flags |= Flags.ClsCompliant;
 487                                 return true;
 488                         }
 489
 490                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 491                         return false;
 492                 }
 493
 494                 /// <summary>
 495                 /// Returns true when MemberCore is exposed from assembly.
 496                 /// </summary>
 497                 public bool IsExposedFromAssembly ()
 498                 {
 499                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 500                                 return false;
 501
 502                         DeclSpace parentContainer = Parent;
 503                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 504                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 505                                         return false;
 506                                 parentContainer = parentContainer.Parent;
 507                         }
 508                         return true;
 509                 }
 510
 511                 /// <summary>
 512                 /// Goes through class hierarchy and gets value of first found CLSCompliantAttribute.
 513                 /// If no is attribute exists then assembly CLSCompliantAttribute is returned.
 514                 /// </summary>
 515                 public virtual bool GetClsCompliantAttributeValue ()
 516                 {
 517                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
 518                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
 519
 520                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
 521
 522                         if (OptAttributes != null) {
 523                                 Attribute cls_attribute = OptAttributes.Search (
 524                                         TypeManager.cls_compliant_attribute_type);
 525                                 if (cls_attribute != null) {
 526                                         caching_flags |= Flags.HasClsCompliantAttribute;
 527                                         bool value = cls_attribute.GetClsCompliantAttributeValue ();
 528                                         if (value)
 529                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 530                                         return value;
 531                                 }
 532                         }
 533
 534                         // It's null for TypeParameter
 535                         if (Parent == null)
 536                                 return false;
 537
 538                         if (Parent.GetClsCompliantAttributeValue ()) {
 539                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 540                                 return true;
 541                         }
 542                         return false;
 543                 }
 544
 545                 /// <summary>
 546                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 547                 /// </summary>
 548                 protected bool HasClsCompliantAttribute {
 549                         get {
 550                                 if ((caching_flags & Flags.HasCompliantAttribute_Undetected) != 0)
 551                                         GetClsCompliantAttributeValue ();
 552
 553                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 554                         }
 555                 }
 556
 557                 /// <summary>
 558                 /// Returns true when a member supports multiple overloads (methods, indexers, etc)
 559                 /// </summary>
 560                 public virtual bool EnableOverloadChecks (MemberCore overload)
 561                 {
 562                         return false;
 563                 }
 564
 565                 /// <summary>
 566                 /// The main virtual method for CLS-Compliant verifications.
 567                 /// The method returns true if member is CLS-Compliant and false if member is not
 568                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 569                 /// and add their extra verifications.
 570                 /// </summary>
 571                 protected virtual bool VerifyClsCompliance ()
 572                 {
 573                         if (!IsClsComplianceRequired ()) {
 574                                 if (HasClsCompliantAttribute && Report.WarningLevel >= 2) {
 575                                         if (!IsExposedFromAssembly ())
 576                                                 Report.Warning (3019, 2, Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
 577                                         if (!CodeGen.Assembly.IsClsCompliant)
 578                                                 Report.Warning (3021, 2, Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
 579                                 }
 580                                 return false;
 581                         }
 582
 583                         if (HasClsCompliantAttribute) {
 584                                 if (CodeGen.Assembly.ClsCompliantAttribute == null && !CodeGen.Assembly.IsClsCompliant) {
 585                                         Report.Error (3014, Location,
 586                                                 "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 587                                                 GetSignatureForError ());
 588                                         return false;
 589                                 }
 590
 591                                 if (!Parent.IsClsComplianceRequired ()) {
 592                                         Report.Warning (3018, 1, Location, "`{0}' cannot be marked as CLS-compliant because it is a member of non CLS-compliant type `{1}'",
 593                                                 GetSignatureForError (), Parent.GetSignatureForError ());
 594                                         return false;
 595                                 }
 596                         }
 597
 598                         if (member_name.Name [0] == '_') {
 599                                 Report.Error (3008, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 600                         }
 601                         return true;
 602                 }
 603
 604                 //
 605                 // Raised (and passed an XmlElement that contains the comment)
 606                 // when GenerateDocComment is writing documentation expectedly.
 607                 //
 608                 internal virtual void OnGenerateDocComment (XmlElement intermediateNode)
 609                 {
 610                 }
 611
 612                 //
 613                 // Returns a string that represents the signature for this
 614                 // member which should be used in XML documentation.
 615                 //
 616                 public virtual string GetDocCommentName (DeclSpace ds)
 617                 {
 618                         if (ds == null || this is DeclSpace)
 619                                 return DocCommentHeader + Name;
 620                         else
 621                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 622                 }
 623
 624                 //
 625                 // Generates xml doc comments (if any), and if required,
 626                 // handle warning report.
 627                 //
 628                 internal virtual void GenerateDocComment (DeclSpace ds)
 629                 {
 630                         try {
 631                                 DocUtil.GenerateDocComment (this, ds);
 632                         } catch (Exception e) {
 633                                 throw new InternalErrorException (this, e);
 634                         }
 635                 }
 636
 637                 public override IResolveContext ResolveContext {
 638                         get { return this; }
 639                 }
 640
 641                 #region IResolveContext Members
 642
 643                 public DeclSpace DeclContainer {
 644                         get { return Parent; }
 645                 }
 646
 647                 public virtual DeclSpace GenericDeclContainer {
 648                         get { return DeclContainer; }
 649                 }
 650
 651                 public bool IsInObsoleteScope {
 652                         get {
 653                                 if (GetObsoleteAttribute () != null)
 654                                         return true;
 655
 656                                 return Parent == null ? false : Parent.IsInObsoleteScope;
 657                         }
 658                 }
 659
 660                 public bool IsInUnsafeScope {
 661                         get {
 662                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 663                                         return true;
 664
 665                                 return Parent == null ? false : Parent.IsInUnsafeScope;
 666                         }
 667                 }
 668
 669                 #endregion
 670         }
 671
 672         /// <summary>
 673         ///   Base class for structs, classes, enumerations and interfaces.
 674         /// </summary>
 675         /// <remarks>
 676         ///   They all create new declaration spaces.  This
 677         ///   provides the common foundation for managing those name
 678         ///   spaces.
 679         /// </remarks>
 680         public abstract class DeclSpace : MemberCore {
 681                 /// <summary>
 682                 ///   This points to the actual definition that is being
 683                 ///   created with System.Reflection.Emit
 684                 /// </summary>
 685                 public TypeBuilder TypeBuilder;
 686
 687                 /// <summary>
 688                 ///   If we are a generic type, this is the type we are
 689                 ///   currently defining.  We need to lookup members on this
 690                 ///   instead of the TypeBuilder.
 691                 /// </summary>
 692                 public Type CurrentType;
 693
 694                 //
 695                 // This is the namespace in which this typecontainer
 696                 // was declared.  We use this to resolve names.
 697                 //
 698                 public NamespaceEntry NamespaceEntry;
 699
 700                 private Hashtable Cache = new Hashtable ();
 701
 702                 public readonly string Basename;
 703
 704                 protected Hashtable defined_names;
 705
 706                 public TypeContainer PartialContainer;
 707
 708                 readonly bool is_generic;
 709                 readonly int count_type_params;
 710                 readonly int count_current_type_params;
 711
 712                 //
 713                 // Whether we are Generic
 714                 //
 715                 public bool IsGeneric {
 716                         get {
 717                                 if (is_generic)
 718                                         return true;
 719                                 else if (Parent != null)
 720                                         return Parent.IsGeneric;
 721                                 else
 722                                         return false;
 723                         }
 724                 }
 725
 726                 static string[] attribute_targets = new string [] { "type" };
 727
 728                 public DeclSpace (NamespaceEntry ns, DeclSpace parent, MemberName name,
 729                                   Attributes attrs)
 730                         : base (parent, name, attrs)
 731                 {
 732                         NamespaceEntry = ns;
 733                         Basename = name.Basename;
 734                         defined_names = new Hashtable ();
 735                         PartialContainer = null;
 736                         if (name.TypeArguments != null) {
 737                                 is_generic = true;
 738                                 count_type_params = count_current_type_params = name.TypeArguments.Count;
 739                         }
 740                         if (parent != null)
 741                                 count_type_params += parent.count_type_params;
 742                 }
 743
 744                 public override DeclSpace GenericDeclContainer {
 745                         get { return this; }
 746                 }
 747
 748                 /// <summary>
 749                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 750                 /// </summary>
 751                 protected virtual bool AddToContainer (MemberCore symbol, string name)
 752                 {
 753                         MemberCore mc = (MemberCore) defined_names [name];
 754
 755                         if (mc == null) {
 756                                 defined_names.Add (name, symbol);
 757                                 return true;
 758                         }
 759
 760                         if (symbol.EnableOverloadChecks (mc))
 761                                 return true;
 762
 763                         Report.SymbolRelatedToPreviousError (mc);
 764                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
 765                                 Error_MissingPartialModifier (symbol);
 766                                 return false;
 767                         }
 768
 769                         if (this is RootTypes) {
 770                                 Report.Error (101, symbol.Location,
 771                                         "The namespace `{0}' already contains a definition for `{1}'",
 772                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
 773                         } else if (symbol is TypeParameter) {
 774                                 Report.Error (692, symbol.Location,
 775                                               "Duplicate type parameter `{0}'", name);
 776                         } else {
 777                                 Report.Error (102, symbol.Location,
 778                                               "The type `{0}' already contains a definition for `{1}'",
 779                                               GetSignatureForError (), symbol.MemberName.Name);
 780                         }
 781
 782                         return false;
 783                 }
 784
 785                 /// <summary>
 786                 ///   Returns the MemberCore associated with a given name in the declaration
 787                 ///   space. It doesn't return method based symbols !!
 788                 /// </summary>
 789                 ///
 790                 public MemberCore GetDefinition (string name)
 791                 {
 792                         return (MemberCore)defined_names [name];
 793                 }
 794
 795                 public bool IsStaticClass {
 796                         get { return (ModFlags & Modifiers.STATIC) != 0; }
 797                 }
 798
 799                 //
 800                 // root_types contains all the types.  All TopLevel types
 801                 // hence have a parent that points to `root_types', that is
 802                 // why there is a non-obvious test down here.
 803                 //
 804                 public bool IsTopLevel {
 805                         get { return (Parent != null && Parent.Parent == null); }
 806                 }
 807
 808                 public virtual void CloseType ()
 809                 {
 810                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 811                                 try {
 812                                         TypeBuilder.CreateType ();
 813                                 } catch {
 814                                         //
 815                                         // The try/catch is needed because
 816                                         // nested enumerations fail to load when they
 817                                         // are defined.
 818                                         //
 819                                         // Even if this is the right order (enumerations
 820                                         // declared after types).
 821                                         //
 822                                         // Note that this still creates the type and
 823                                         // it is possible to save it
 824                                 }
 825                                 caching_flags |= Flags.CloseTypeCreated;
 826                         }
 827                 }
 828
 829                 protected virtual TypeAttributes TypeAttr {
 830                         get { return CodeGen.Module.DefaultCharSetType; }
 831                 }
 832
 833                 /// <remarks>
 834                 ///  Should be overriten by the appropriate declaration space
 835                 /// </remarks>
 836                 public abstract TypeBuilder DefineType ();
 837
 838                 /// <summary>
 839                 ///   Define all members, but don't apply any attributes or do anything which may
 840                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 841                 /// </summary>
 842                 public virtual bool DefineMembers ()
 843                 {
 844                         if (((ModFlags & Modifiers.NEW) != 0) && IsTopLevel) {
 845                                 Report.Error (1530, Location, "Keyword `new' is not allowed on namespace elements");
 846                                 return false;
 847                         }
 848                         return true;
 849                 }
 850
 851                 protected void Error_MissingPartialModifier (MemberCore type)
 852                 {
 853                         Report.Error (260, type.Location,
 854                                 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
 855                                 type.GetSignatureForError ());
 856                 }
 857
 858                 public override string GetSignatureForError ()
 859                 {
 860                         if (IsGeneric) {
 861                                 return SimpleName.RemoveGenericArity (Name) + TypeParameter.GetSignatureForError (CurrentTypeParameters);
 862                         }
 863                         // Parent.GetSignatureForError
 864                         return Name;
 865                 }
 866
 867                 public bool CheckAccessLevel (Type check_type)
 868                 {
 869                         TypeBuilder tb;
 870                         if (this is GenericMethod)
 871                                 tb = Parent.TypeBuilder;
 872                         else
 873                                 tb = TypeBuilder;
 874
 875                         check_type = TypeManager.DropGenericTypeArguments (check_type);
 876                         if (check_type == tb)
 877                                 return true;
 878
 879                         if (TypeBuilder == null)
 880                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 881                                 //        However, this is invoked again later -- so safe to return true.
 882                                 //        May also be null when resolving top-level attributes.
 883                                 return true;
 884
 885                         //
 886                         // Broken Microsoft runtime, return public for arrays, no matter what
 887                         // the accessibility is for their underlying class, and they return
 888                         // NonPublic visibility for pointers
 889                         //
 890                         if (check_type.IsArray || check_type.IsPointer)
 891                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 892
 893                         if (TypeManager.IsGenericParameter(check_type))
 894                                 return true; // FIXME
 895
 896                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 897
 898                         switch (check_attr){
 899                         case TypeAttributes.Public:
 900                                 return true;
 901
 902                         case TypeAttributes.NotPublic:
 903
 904                                 if (TypeBuilder == null)
 905                                         // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 906                                         //        However, this is invoked again later -- so safe to return true.
 907                                         //        May also be null when resolving top-level attributes.
 908                                         return true;
 909                                 //
 910                                 // This test should probably use the declaringtype.
 911                                 //
 912                                 return check_type.Assembly == TypeBuilder.Assembly ||
 913                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 914
 915                         case TypeAttributes.NestedPublic:
 916                                 return true;
 917
 918                         case TypeAttributes.NestedPrivate:
 919                                 return NestedAccessible (tb, check_type);
 920
 921                         case TypeAttributes.NestedFamily:
 922                                 //
 923                                 // Only accessible to methods in current type or any subtypes
 924                                 //
 925                                 return FamilyAccessible (tb, check_type);
 926
 927                         case TypeAttributes.NestedFamANDAssem:
 928                                 return ((check_type.Assembly == tb.Assembly) ||
 929                                                 TypeManager.IsFriendAssembly (check_type.Assembly)) &&
 930                                         FamilyAccessible (tb, check_type);
 931
 932                         case TypeAttributes.NestedFamORAssem:
 933                                 return (check_type.Assembly == tb.Assembly) ||
 934                                         FamilyAccessible (tb, check_type) ||
 935                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 936
 937                         case TypeAttributes.NestedAssembly:
 938                                 return check_type.Assembly == tb.Assembly ||
 939                                         TypeManager.IsFriendAssembly (check_type.Assembly);
 940                         }
 941
 942                         Console.WriteLine ("HERE: " + check_attr);
 943                         return false;
 944
 945                 }
 946
 947                 protected bool NestedAccessible (Type tb, Type check_type)
 948                 {
 949                         Type declaring = check_type.DeclaringType;
 950                         return TypeBuilder == declaring ||
 951                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 952                 }
 953
 954                 protected bool FamilyAccessible (Type tb, Type check_type)
 955                 {
 956                         Type declaring = check_type.DeclaringType;
 957                         return TypeManager.IsNestedFamilyAccessible (TypeBuilder, declaring);
 958                 }
 959
 960                 // Access level of a type.
 961                 const int X = 1;
 962                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 963                         // Public    Assembly   Protected
 964                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 965                         Public              = (X << 0) | (X << 1) | (X << 2),
 966                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 967                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 968                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 969                 }
 970
 971                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 972                 {
 973                         if ((flags & Modifiers.INTERNAL) != 0) {
 974
 975                                 if ((flags & Modifiers.PROTECTED) != 0)
 976                                         return AccessLevel.ProtectedOrInternal;
 977                                 else
 978                                         return AccessLevel.Internal;
 979
 980                         } else if ((flags & Modifiers.PROTECTED) != 0)
 981                                 return AccessLevel.Protected;
 982                         else if ((flags & Modifiers.PRIVATE) != 0)
 983                                 return AccessLevel.Private;
 984                         else
 985                                 return AccessLevel.Public;
 986                 }
 987
 988                 // What is the effective access level of this?
 989                 // TODO: Cache this?
 990                 AccessLevel EffectiveAccessLevel {
 991                         get {
 992                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 993                                 if (!IsTopLevel && (Parent != null))
 994                                         return myAccess & Parent.EffectiveAccessLevel;
 995                                 return myAccess;
 996                         }
 997                 }
 998
 999                 // Return the access level for type `t'
1000                 static AccessLevel TypeEffectiveAccessLevel (Type t)
1001                 {
1002                         if (t.IsPublic)
1003                                 return AccessLevel.Public;
1004                         if (t.IsNestedPrivate)
1005                                 return AccessLevel.Private;
1006                         if (t.IsNotPublic)
1007                                 return AccessLevel.Internal;
1008
1009                         // By now, it must be nested
1010                         AccessLevel parent_level = TypeEffectiveAccessLevel (t.DeclaringType);
1011
1012                         if (t.IsNestedPublic)
1013                                 return parent_level;
1014                         if (t.IsNestedAssembly)
1015                                 return parent_level & AccessLevel.Internal;
1016                         if (t.IsNestedFamily)
1017                                 return parent_level & AccessLevel.Protected;
1018                         if (t.IsNestedFamORAssem)
1019                                 return parent_level & AccessLevel.ProtectedOrInternal;
1020                         if (t.IsNestedFamANDAssem)
1021                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
1022
1023                         // nested private is taken care of
1024
1025                         throw new Exception ("I give up, what are you?");
1026                 }
1027
1028                 //
1029                 // This answers `is the type P, as accessible as a member M which has the
1030                 // accessability @flags which is declared as a nested member of the type T, this declspace'
1031                 //
1032                 public bool AsAccessible (Type p, int flags)
1033                 {
1034                         //
1035                         // 1) if M is private, its accessability is the same as this declspace.
1036                         // we already know that P is accessible to T before this method, so we
1037                         // may return true.
1038                         //
1039
1040                         if ((flags & Modifiers.PRIVATE) != 0)
1041                                 return true;
1042
1043                         while (p.IsArray || p.IsPointer || p.IsByRef)
1044                                 p = TypeManager.GetElementType (p);
1045
1046 #if GMCS_SOURCE
1047                         if (p.IsGenericParameter)
1048                                 return true;
1049
1050                         if (TypeManager.IsGenericType (p)) {
1051                                 foreach (Type t in p.GetGenericArguments ()) {
1052                                         if (!AsAccessible (t, flags))
1053                                                 return false;
1054                                 }
1055                         }
1056 #endif
1057                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
1058                         AccessLevel mAccess = this.EffectiveAccessLevel &
1059                                 GetAccessLevelFromModifiers (flags);
1060
1061                         // for every place from which we can access M, we must
1062                         // be able to access P as well. So, we want
1063                         // For every bit in M and P, M_i -> P_1 == true
1064                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
1065
1066                         return ~ (~ mAccess | pAccess) == 0;
1067                 }
1068
1069                 private Type LookupNestedTypeInHierarchy (string name)
1070                 {
1071                         Type t = null;
1072                         // if the member cache has been created, lets use it.
1073                         // the member cache is MUCH faster.
1074                         if (MemberCache != null) {
1075                                 t = MemberCache.FindNestedType (name);
1076                                 if (t == null)
1077                                         return null;
1078
1079                         //
1080                         // FIXME: This hack is needed because member cache does not work
1081                         // with nested base generic types, it does only type name copy and
1082                         // not type construction
1083                         //
1084 #if !GMCS_SOURCE
1085                                 return t;
1086 #endif
1087                         }
1088
1089                         // no member cache. Do it the hard way -- reflection
1090                         for (Type current_type = TypeBuilder;
1091                              current_type != null && current_type != TypeManager.object_type;
1092                              current_type = current_type.BaseType) {
1093
1094                                 Type ct = TypeManager.DropGenericTypeArguments (current_type);
1095                                 if (ct is TypeBuilder) {
1096                                         TypeContainer tc = ct == TypeBuilder
1097                                                 ? PartialContainer : TypeManager.LookupTypeContainer (ct);
1098                                         if (tc != null)
1099                                                 t = tc.FindNestedType (name);
1100                                 } else {
1101                                         t = TypeManager.GetNestedType (ct, name);
1102                                 }
1103
1104                                 if ((t == null) || !CheckAccessLevel (t))
1105                                         continue;
1106
1107 #if GMCS_SOURCE
1108                                 if (!TypeManager.IsGenericType (current_type))
1109                                         return t;
1110
1111                                 Type[] args = TypeManager.GetTypeArguments (current_type);
1112                                 Type[] targs = TypeManager.GetTypeArguments (t);
1113                                 for (int i = 0; i < args.Length; i++)
1114                                         targs [i] = args [i];
1115
1116                                 t = t.MakeGenericType (targs);
1117 #endif
1118
1119                                 return t;
1120                         }
1121
1122                         return null;
1123                 }
1124
1125                 public virtual ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name)
1126                 {
1127                         return null;
1128                 }
1129
1130                 //
1131                 // Public function used to locate types.
1132                 //
1133                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1134                 //
1135                 // Returns: Type or null if they type can not be found.
1136                 //
1137                 public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
1138                 {
1139                         if (Cache.Contains (name))
1140                                 return (FullNamedExpression) Cache [name];
1141
1142                         FullNamedExpression e;
1143                         int errors = Report.Errors;
1144                         Type t = LookupNestedTypeInHierarchy (name);
1145                         if (t != null)
1146                                 e = new TypeExpression (t, Location.Null);
1147                         else if (Parent != null)
1148                                 e = Parent.LookupNamespaceOrType (name, loc, ignore_cs0104);
1149                         else
1150                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
1151
1152                         if (errors == Report.Errors)
1153                                 Cache [name] = e;
1154
1155                         return e;
1156                 }
1157
1158                 /// <remarks>
1159                 ///   This function is broken and not what you're looking for.  It should only
1160                 ///   be used while the type is still being created since it doesn't use the cache
1161                 ///   and relies on the filter doing the member name check.
1162                 /// </remarks>
1163                 ///
1164                 // [Obsolete ("Only MemberCache approach should be used")]
1165                 public virtual MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1166                                                         MemberFilter filter, object criteria)
1167                 {
1168                         throw new NotSupportedException ();
1169                 }
1170
1171                 /// <remarks>
1172                 ///   If we have a MemberCache, return it.  This property may return null if the
1173                 ///   class doesn't have a member cache or while it's still being created.
1174                 /// </remarks>
1175                 public abstract MemberCache MemberCache {
1176                         get;
1177                 }
1178
1179                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1180                 {
1181                         if (a.Type == TypeManager.required_attr_type) {
1182                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1183                                 return;
1184                         }
1185                         TypeBuilder.SetCustomAttribute (cb);
1186                 }
1187
1188                 //
1189                 // Extensions for generics
1190                 //
1191                 TypeParameter[] type_params;
1192                 TypeParameter[] type_param_list;
1193
1194                 protected string GetInstantiationName ()
1195                 {
1196                         StringBuilder sb = new StringBuilder (Name);
1197                         sb.Append ("<");
1198                         for (int i = 0; i < type_param_list.Length; i++) {
1199                                 if (i > 0)
1200                                         sb.Append (",");
1201                                 sb.Append (type_param_list [i].Name);
1202                         }
1203                         sb.Append (">");
1204                         return sb.ToString ();
1205                 }
1206
1207                 bool check_type_parameter (ArrayList list, int start, string name)
1208                 {
1209                         for (int i = 0; i < start; i++) {
1210                                 TypeParameter param = (TypeParameter) list [i];
1211
1212                                 if (param.Name != name)
1213                                         continue;
1214
1215                                 Report.SymbolRelatedToPreviousError (Parent);
1216                                 // TODO: Location is wrong (parent instead of child)
1217                                 Report.Warning (693, 3, Location,
1218                                         "Type parameter `{0}' has the same name as the type parameter from outer type `{1}'",
1219                                         name, Parent.GetSignatureForError ());
1220
1221                                 return false;
1222                         }
1223
1224                         return true;
1225                 }
1226
1227                 TypeParameter[] initialize_type_params ()
1228                 {
1229                         if (type_param_list != null)
1230                                 return type_param_list;
1231
1232                         DeclSpace the_parent = Parent;
1233                         if (this is GenericMethod)
1234                                 the_parent = null;
1235
1236                         int start = 0;
1237                         ArrayList list = new ArrayList ();
1238                         if (the_parent != null && the_parent.IsGeneric) {
1239                                 // FIXME: move generics info out of DeclSpace
1240                                 TypeParameter[] parent_params = the_parent.PartialContainer.TypeParameters;
1241                                 start = parent_params.Length;
1242                                 list.AddRange (parent_params);
1243                         }
1244
1245                         int count = type_params != null ? type_params.Length : 0;
1246                         for (int i = 0; i < count; i++) {
1247                                 TypeParameter param = type_params [i];
1248                                 check_type_parameter (list, start, param.Name);
1249                                 list.Add (param);
1250                         }
1251
1252                         type_param_list = new TypeParameter [list.Count];
1253                         list.CopyTo (type_param_list, 0);
1254                         return type_param_list;
1255                 }
1256
1257                 public virtual void SetParameterInfo (ArrayList constraints_list)
1258                 {
1259                         if (!is_generic) {
1260                                 if (constraints_list != null) {
1261                                         Report.Error (
1262                                                 80, Location, "Constraints are not allowed " +
1263                                                 "on non-generic declarations");
1264                                 }
1265
1266                                 return;
1267                         }
1268
1269                         TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1270                         type_params = new TypeParameter [names.Length];
1271
1272                         //
1273                         // Register all the names
1274                         //
1275                         for (int i = 0; i < type_params.Length; i++) {
1276                                 TypeParameterName name = names [i];
1277
1278                                 Constraints constraints = null;
1279                                 if (constraints_list != null) {
1280                                         int total = constraints_list.Count;
1281                                         for (int ii = 0; ii < total; ++ii) {
1282                                                 Constraints constraints_at = (Constraints)constraints_list[ii];
1283                                                 // TODO: it is used by iterators only
1284                                                 if (constraints_at == null) {
1285                                                         constraints_list.RemoveAt (ii);
1286                                                         --total;
1287                                                         continue;
1288                                                 }
1289                                                 if (constraints_at.TypeParameter == name.Name) {
1290                                                         constraints = constraints_at;
1291                                                         constraints_list.RemoveAt(ii);
1292                                                         break;
1293                                                 }
1294                                         }
1295                                 }
1296
1297                                 type_params [i] = new TypeParameter (
1298                                         Parent, this, name.Name, constraints, name.OptAttributes,
1299                                         Location);
1300
1301                                 AddToContainer (type_params [i], name.Name);
1302                         }
1303
1304                         if (constraints_list != null && constraints_list.Count > 0) {
1305                                 foreach (Constraints constraint in constraints_list) {
1306                                         Report.Error(699, constraint.Location, "`{0}': A constraint references nonexistent type parameter `{1}'",
1307                                                 GetSignatureForError (), constraint.TypeParameter);
1308                                 }
1309                         }
1310                 }
1311
1312                 public TypeParameter[] TypeParameters {
1313                         get {
1314                                 if (!IsGeneric)
1315                                         throw new InvalidOperationException ();
1316                                 if ((PartialContainer != null) && (PartialContainer != this))
1317                                         return PartialContainer.TypeParameters;
1318                                 if (type_param_list == null)
1319                                         initialize_type_params ();
1320
1321                                 return type_param_list;
1322                         }
1323                 }
1324
1325                 public TypeParameter[] CurrentTypeParameters {
1326                         get {
1327                                 if (!IsGeneric)
1328                                         throw new InvalidOperationException ();
1329                                 if ((PartialContainer != null) && (PartialContainer != this))
1330                                         return PartialContainer.CurrentTypeParameters;
1331                                 if (type_params != null)
1332                                         return type_params;
1333                                 else
1334                                         return new TypeParameter [0];
1335                         }
1336                 }
1337
1338                 public int CountTypeParameters {
1339                         get {
1340                                 return count_type_params;
1341                         }
1342                 }
1343
1344                 public int CountCurrentTypeParameters {
1345                         get {
1346                                 return count_current_type_params;
1347                         }
1348                 }
1349
1350                 public TypeParameterExpr LookupGeneric (string name, Location loc)
1351                 {
1352                         if (!IsGeneric)
1353                                 return null;
1354
1355                         TypeParameter [] current_params;
1356                         if (this is TypeContainer)
1357                                 current_params = PartialContainer.CurrentTypeParameters;
1358                         else
1359                                 current_params = CurrentTypeParameters;
1360
1361                         foreach (TypeParameter type_param in current_params) {
1362                                 if (type_param.Name == name)
1363                                         return new TypeParameterExpr (type_param, loc);
1364                         }
1365
1366                         if (Parent != null)
1367                                 return Parent.LookupGeneric (name, loc);
1368
1369                         return null;
1370                 }
1371
1372                 // Used for error reporting only
1373                 public virtual Type LookupAnyGeneric (string typeName)
1374                 {
1375                         return NamespaceEntry.NS.LookForAnyGenericType (typeName);
1376                 }
1377
1378                 public override string[] ValidAttributeTargets {
1379                         get { return attribute_targets; }
1380                 }
1381
1382                 protected override bool VerifyClsCompliance ()
1383                 {
1384                         if (!base.VerifyClsCompliance ()) {
1385                                 return false;
1386                         }
1387
1388                         if (type_params != null) {
1389                                 foreach (TypeParameter tp in type_params) {
1390                                         if (tp.Constraints == null)
1391                                                 continue;
1392
1393                                         tp.Constraints.VerifyClsCompliance ();
1394                                 }
1395                         }
1396
1397                         IDictionary cache = TypeManager.AllClsTopLevelTypes;
1398                         if (cache == null)
1399                                 return true;
1400
1401                         string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1402                         if (!cache.Contains (lcase)) {
1403                                 cache.Add (lcase, this);
1404                                 return true;
1405                         }
1406
1407                         object val = cache [lcase];
1408                         if (val == null) {
1409                                 Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
1410                                 if (t == null)
1411                                         return true;
1412                                 Report.SymbolRelatedToPreviousError (t);
1413                         }
1414                         else {
1415                                 Report.SymbolRelatedToPreviousError ((DeclSpace)val);
1416                         }
1417 #if GMCS_SOURCE
1418                         Report.Warning (3005, 1, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1419 #else
1420                         Report.Error (3005, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1421 #endif
1422                         return true;
1423                 }
1424         }
1425
1426         /// <summary>
1427         ///   This is a readonly list of MemberInfo's.
1428         /// </summary>
1429         public class MemberList : IList {
1430                 public readonly IList List;
1431                 int count;
1432
1433                 /// <summary>
1434                 ///   Create a new MemberList from the given IList.
1435                 /// </summary>
1436                 public MemberList (IList list)
1437                 {
1438                         if (list != null)
1439                                 this.List = list;
1440                         else
1441                                 this.List = new ArrayList ();
1442                         count = List.Count;
1443                 }
1444
1445                 /// <summary>
1446                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1447                 /// </summary>
1448                 public MemberList (IList first, IList second)
1449                 {
1450                         ArrayList list = new ArrayList ();
1451                         list.AddRange (first);
1452                         list.AddRange (second);
1453                         count = list.Count;
1454                         List = list;
1455                 }
1456
1457                 public static readonly MemberList Empty = new MemberList (new ArrayList (0));
1458
1459                 /// <summary>
1460                 ///   Cast the MemberList into a MemberInfo[] array.
1461                 /// </summary>
1462                 /// <remarks>
1463                 ///   This is an expensive operation, only use it if it's really necessary.
1464                 /// </remarks>
1465                 public static explicit operator MemberInfo [] (MemberList list)
1466                 {
1467                         Timer.StartTimer (TimerType.MiscTimer);
1468                         MemberInfo [] result = new MemberInfo [list.Count];
1469                         list.CopyTo (result, 0);
1470                         Timer.StopTimer (TimerType.MiscTimer);
1471                         return result;
1472                 }
1473
1474                 // ICollection
1475
1476                 public int Count {
1477                         get {
1478                                 return count;
1479                         }
1480                 }
1481
1482                 public bool IsSynchronized {
1483                         get {
1484                                 return List.IsSynchronized;
1485                         }
1486                 }
1487
1488                 public object SyncRoot {
1489                         get {
1490                                 return List.SyncRoot;
1491                         }
1492                 }
1493
1494                 public void CopyTo (Array array, int index)
1495                 {
1496                         List.CopyTo (array, index);
1497                 }
1498
1499                 // IEnumerable
1500
1501                 public IEnumerator GetEnumerator ()
1502                 {
1503                         return List.GetEnumerator ();
1504                 }
1505
1506                 // IList
1507
1508                 public bool IsFixedSize {
1509                         get {
1510                                 return true;
1511                         }
1512                 }
1513
1514                 public bool IsReadOnly {
1515                         get {
1516                                 return true;
1517                         }
1518                 }
1519
1520                 object IList.this [int index] {
1521                         get {
1522                                 return List [index];
1523                         }
1524
1525                         set {
1526                                 throw new NotSupportedException ();
1527                         }
1528                 }
1529
1530                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1531                 public MemberInfo this [int index] {
1532                         get {
1533                                 return (MemberInfo) List [index];
1534                         }
1535                 }
1536
1537                 public int Add (object value)
1538                 {
1539                         throw new NotSupportedException ();
1540                 }
1541
1542                 public void Clear ()
1543                 {
1544                         throw new NotSupportedException ();
1545                 }
1546
1547                 public bool Contains (object value)
1548                 {
1549                         return List.Contains (value);
1550                 }
1551
1552                 public int IndexOf (object value)
1553                 {
1554                         return List.IndexOf (value);
1555                 }
1556
1557                 public void Insert (int index, object value)
1558                 {
1559                         throw new NotSupportedException ();
1560                 }
1561
1562                 public void Remove (object value)
1563                 {
1564                         throw new NotSupportedException ();
1565                 }
1566
1567                 public void RemoveAt (int index)
1568                 {
1569                         throw new NotSupportedException ();
1570                 }
1571         }
1572
1573         /// <summary>
1574         ///   This interface is used to get all members of a class when creating the
1575         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1576         ///   want to support the member cache and by TypeHandle to get caching of
1577         ///   non-dynamic types.
1578         /// </summary>
1579         public interface IMemberContainer {
1580                 /// <summary>
1581                 ///   The name of the IMemberContainer.  This is only used for
1582                 ///   debugging purposes.
1583                 /// </summary>
1584                 string Name {
1585                         get;
1586                 }
1587
1588                 /// <summary>
1589                 ///   The type of this IMemberContainer.
1590                 /// </summary>
1591                 Type Type {
1592                         get;
1593                 }
1594
1595                 /// <summary>
1596                 ///   Returns the IMemberContainer of the base class or null if this
1597                 ///   is an interface or TypeManger.object_type.
1598                 ///   This is used when creating the member cache for a class to get all
1599                 ///   members from the base class.
1600                 /// </summary>
1601                 MemberCache BaseCache {
1602                         get;
1603                 }
1604
1605                 /// <summary>
1606                 ///   Whether this is an interface.
1607                 /// </summary>
1608                 bool IsInterface {
1609                         get;
1610                 }
1611
1612                 /// <summary>
1613                 ///   Returns all members of this class with the corresponding MemberTypes
1614                 ///   and BindingFlags.
1615                 /// </summary>
1616                 /// <remarks>
1617                 ///   When implementing this method, make sure not to return any inherited
1618                 ///   members and check the MemberTypes and BindingFlags properly.
1619                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1620                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1621                 ///   MemberInfo class, but the cache needs this information.  That's why
1622                 ///   this method is called multiple times with different BindingFlags.
1623                 /// </remarks>
1624                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1625         }
1626
1627         /// <summary>
1628         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1629         ///   member lookups.  It has a member name based hash table; it maps each member
1630         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1631         ///   and the BindingFlags that were initially used to get it.  The cache contains
1632         ///   all members of the current class and all inherited members.  If this cache is
1633         ///   for an interface types, it also contains all inherited members.
1634         ///
1635         ///   There are two ways to get a MemberCache:
1636         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1637         ///     use the DeclSpace.MemberCache property.
1638         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1639         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1640         /// </summary>
1641         public class MemberCache {
1642                 public readonly IMemberContainer Container;
1643                 protected Hashtable member_hash;
1644                 protected Hashtable method_hash;
1645
1646                 /// <summary>
1647                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1648                 /// </summary>
1649                 public MemberCache (IMemberContainer container)
1650                 {
1651                         this.Container = container;
1652
1653                         Timer.IncrementCounter (CounterType.MemberCache);
1654                         Timer.StartTimer (TimerType.CacheInit);
1655
1656                         // If we have a base class (we have a base class unless we're
1657                         // TypeManager.object_type), we deep-copy its MemberCache here.
1658                         if (Container.BaseCache != null)
1659                                 member_hash = SetupCache (Container.BaseCache);
1660                         else
1661                                 member_hash = new Hashtable ();
1662
1663                         // If this is neither a dynamic type nor an interface, create a special
1664                         // method cache with all declared and inherited methods.
1665                         Type type = container.Type;
1666                         if (!(type is TypeBuilder) && !type.IsInterface &&
1667                             // !(type.IsGenericType && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
1668                             !TypeManager.IsGenericType (type) && !TypeManager.IsGenericParameter (type) &&
1669                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1670                                 method_hash = new Hashtable ();
1671                                 AddMethods (type);
1672                         }
1673
1674                         // Add all members from the current class.
1675                         AddMembers (Container);
1676
1677                         Timer.StopTimer (TimerType.CacheInit);
1678                 }
1679
1680                 public MemberCache (Type baseType, IMemberContainer container)
1681                 {
1682                         this.Container = container;
1683                         if (baseType == null)
1684                                 this.member_hash = new Hashtable ();
1685                         else
1686                                 this.member_hash = SetupCache (TypeManager.LookupMemberCache (baseType));
1687                 }
1688
1689                 public MemberCache (Type[] ifaces)
1690                 {
1691                         //
1692                         // The members of this cache all belong to other caches.
1693                         // So, 'Container' will not be used.
1694                         //
1695                         this.Container = null;
1696
1697                         member_hash = new Hashtable ();
1698                         if (ifaces == null)
1699                                 return;
1700
1701                         foreach (Type itype in ifaces)
1702                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1703                 }
1704
1705                 public MemberCache (IMemberContainer container, Type base_class, Type[] ifaces)
1706                 {
1707                         this.Container = container;
1708
1709                         // If we have a base class (we have a base class unless we're
1710                         // TypeManager.object_type), we deep-copy its MemberCache here.
1711                         if (Container.BaseCache != null)
1712                                 member_hash = SetupCache (Container.BaseCache);
1713                         else
1714                                 member_hash = new Hashtable ();
1715
1716                         if (base_class != null)
1717                                 AddCacheContents (TypeManager.LookupMemberCache (base_class));
1718                         if (ifaces != null) {
1719                                 foreach (Type itype in ifaces) {
1720                                         MemberCache cache = TypeManager.LookupMemberCache (itype);
1721                                         if (cache != null)
1722                                                 AddCacheContents (cache);
1723                                 }
1724                         }
1725                 }
1726
1727                 /// <summary>
1728                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1729                 /// </summary>
1730                 static Hashtable SetupCache (MemberCache base_class)
1731                 {
1732                         if (base_class == null)
1733                                 return new Hashtable ();
1734
1735                         Hashtable hash = new Hashtable (base_class.member_hash.Count);
1736                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1737                         while (it.MoveNext ()) {
1738                                 hash.Add (it.Key, ((ArrayList) it.Value).Clone ());
1739                          }
1740
1741                         return hash;
1742                 }
1743
1744                 //
1745                 // Converts ModFlags to BindingFlags
1746                 //
1747                 static BindingFlags GetBindingFlags (int modifiers)
1748                 {
1749                         BindingFlags bf;
1750                         if ((modifiers & Modifiers.STATIC) != 0)
1751                                 bf = BindingFlags.Static;
1752                         else
1753                                 bf = BindingFlags.Instance;
1754
1755                         if ((modifiers & Modifiers.PRIVATE) != 0)
1756                                 bf |= BindingFlags.NonPublic;
1757                         else
1758                                 bf |= BindingFlags.Public;
1759
1760                         return bf;
1761                 }
1762
1763                 /// <summary>
1764                 ///   Add the contents of `cache' to the member_hash.
1765                 /// </summary>
1766                 void AddCacheContents (MemberCache cache)
1767                 {
1768                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1769                         while (it.MoveNext ()) {
1770                                 ArrayList list = (ArrayList) member_hash [it.Key];
1771                                 if (list == null)
1772                                         member_hash [it.Key] = list = new ArrayList ();
1773
1774                                 ArrayList entries = (ArrayList) it.Value;
1775                                 for (int i = entries.Count-1; i >= 0; i--) {
1776                                         CacheEntry entry = (CacheEntry) entries [i];
1777
1778                                         if (entry.Container != cache.Container)
1779                                                 break;
1780                                         list.Add (entry);
1781                                 }
1782                         }
1783                 }
1784
1785                 /// <summary>
1786                 ///   Add all members from class `container' to the cache.
1787                 /// </summary>
1788                 void AddMembers (IMemberContainer container)
1789                 {
1790                         // We need to call AddMembers() with a single member type at a time
1791                         // to get the member type part of CacheEntry.EntryType right.
1792                         if (!container.IsInterface) {
1793                                 AddMembers (MemberTypes.Constructor, container);
1794                                 AddMembers (MemberTypes.Field, container);
1795                         }
1796                         AddMembers (MemberTypes.Method, container);
1797                         AddMembers (MemberTypes.Property, container);
1798                         AddMembers (MemberTypes.Event, container);
1799                         // Nested types are returned by both Static and Instance searches.
1800                         AddMembers (MemberTypes.NestedType,
1801                                     BindingFlags.Static | BindingFlags.Public, container);
1802                         AddMembers (MemberTypes.NestedType,
1803                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1804                 }
1805
1806                 void AddMembers (MemberTypes mt, IMemberContainer container)
1807                 {
1808                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1809                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1810                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1811                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1812                 }
1813
1814                 public void AddMember (MemberInfo mi, MemberCore mc)
1815                 {
1816                         AddMember (mi.MemberType, GetBindingFlags (mc.ModFlags), Container, mi.Name, mi);
1817                 }
1818
1819                 public void AddGenericMember (MemberInfo mi, MemberCore mc)
1820                 {
1821                         AddMember (mi.MemberType, GetBindingFlags (mc.ModFlags), Container, mc.MemberName.Basename, mi);
1822                 }
1823
1824                 public void AddNestedType (DeclSpace type)
1825                 {
1826                         AddMember (MemberTypes.NestedType, GetBindingFlags (type.ModFlags), (IMemberContainer) type.Parent,
1827                                 type.TypeBuilder.Name, type.TypeBuilder);
1828                 }
1829
1830                 public void AddInterface (MemberCache baseCache)
1831                 {
1832                         if (baseCache.member_hash.Count > 0)
1833                                 AddCacheContents (baseCache);
1834                 }
1835
1836                 void AddMember (MemberTypes mt, BindingFlags bf, IMemberContainer container,
1837                                 string name, MemberInfo member)
1838                 {
1839                         // We use a name-based hash table of ArrayList's.
1840                         ArrayList list = (ArrayList) member_hash [name];
1841                         if (list == null) {
1842                                 list = new ArrayList (1);
1843                                 member_hash.Add (name, list);
1844                         }
1845
1846                         // When this method is called for the current class, the list will
1847                         // already contain all inherited members from our base classes.
1848                         // We cannot add new members in front of the list since this'd be an
1849                         // expensive operation, that's why the list is sorted in reverse order
1850                         // (ie. members from the current class are coming last).
1851                         list.Add (new CacheEntry (container, member, mt, bf));
1852                 }
1853
1854                 /// <summary>
1855                 ///   Add all members from class `container' with the requested MemberTypes and
1856                 ///   BindingFlags to the cache.  This method is called multiple times with different
1857                 ///   MemberTypes and BindingFlags.
1858                 /// </summary>
1859                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1860                 {
1861                         MemberList members = container.GetMembers (mt, bf);
1862
1863                         foreach (MemberInfo member in members) {
1864                                 string name = member.Name;
1865
1866                                 AddMember (mt, bf, container, name, member);
1867
1868                                 if (member is MethodInfo) {
1869                                         string gname = TypeManager.GetMethodName ((MethodInfo) member);
1870                                         if (gname != name)
1871                                                 AddMember (mt, bf, container, gname, member);
1872                                 }
1873                         }
1874                 }
1875
1876                 /// <summary>
1877                 ///   Add all declared and inherited methods from class `type' to the method cache.
1878                 /// </summary>
1879                 void AddMethods (Type type)
1880                 {
1881                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1882                                     BindingFlags.FlattenHierarchy, type);
1883                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1884                                     BindingFlags.FlattenHierarchy, type);
1885                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1886                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1887                 }
1888
1889                 static ArrayList overrides = new ArrayList ();
1890
1891                 void AddMethods (BindingFlags bf, Type type)
1892                 {
1893                         MethodBase [] members = type.GetMethods (bf);
1894
1895                         Array.Reverse (members);
1896
1897                         foreach (MethodBase member in members) {
1898                                 string name = member.Name;
1899
1900                                 // We use a name-based hash table of ArrayList's.
1901                                 ArrayList list = (ArrayList) method_hash [name];
1902                                 if (list == null) {
1903                                         list = new ArrayList (1);
1904                                         method_hash.Add (name, list);
1905                                 }
1906
1907                                 MethodInfo curr = (MethodInfo) member;
1908                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1909                                         MethodInfo base_method = curr.GetBaseDefinition ();
1910
1911                                         if (base_method == curr)
1912                                                 // Not every virtual function needs to have a NewSlot flag.
1913                                                 break;
1914
1915                                         overrides.Add (curr);
1916                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1917                                         curr = base_method;
1918                                 }
1919
1920                                 if (overrides.Count > 0) {
1921                                         for (int i = 0; i < overrides.Count; ++i)
1922                                                 TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
1923                                         overrides.Clear ();
1924                                 }
1925
1926                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1927                                 // sorted so we need to do this check for every member.
1928                                 BindingFlags new_bf = bf;
1929                                 if (member.DeclaringType == type)
1930                                         new_bf |= BindingFlags.DeclaredOnly;
1931
1932                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1933                         }
1934                 }
1935
1936                 /// <summary>
1937                 ///   Compute and return a appropriate `EntryType' magic number for the given
1938                 ///   MemberTypes and BindingFlags.
1939                 /// </summary>
1940                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1941                 {
1942                         EntryType type = EntryType.None;
1943
1944                         if ((mt & MemberTypes.Constructor) != 0)
1945                                 type |= EntryType.Constructor;
1946                         if ((mt & MemberTypes.Event) != 0)
1947                                 type |= EntryType.Event;
1948                         if ((mt & MemberTypes.Field) != 0)
1949                                 type |= EntryType.Field;
1950                         if ((mt & MemberTypes.Method) != 0)
1951                                 type |= EntryType.Method;
1952                         if ((mt & MemberTypes.Property) != 0)
1953                                 type |= EntryType.Property;
1954                         // Nested types are returned by static and instance searches.
1955                         if ((mt & MemberTypes.NestedType) != 0)
1956                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1957
1958                         if ((bf & BindingFlags.Instance) != 0)
1959                                 type |= EntryType.Instance;
1960                         if ((bf & BindingFlags.Static) != 0)
1961                                 type |= EntryType.Static;
1962                         if ((bf & BindingFlags.Public) != 0)
1963                                 type |= EntryType.Public;
1964                         if ((bf & BindingFlags.NonPublic) != 0)
1965                                 type |= EntryType.NonPublic;
1966                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1967                                 type |= EntryType.Declared;
1968
1969                         return type;
1970                 }
1971
1972                 /// <summary>
1973                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1974                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1975                 ///   single member types.
1976                 /// </summary>
1977                 public static bool IsSingleMemberType (MemberTypes mt)
1978                 {
1979                         switch (mt) {
1980                         case MemberTypes.Constructor:
1981                         case MemberTypes.Event:
1982                         case MemberTypes.Field:
1983                         case MemberTypes.Method:
1984                         case MemberTypes.Property:
1985                         case MemberTypes.NestedType:
1986                                 return true;
1987
1988                         default:
1989                                 return false;
1990                         }
1991                 }
1992
1993                 /// <summary>
1994                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1995                 ///   number to speed up the searching process.
1996                 /// </summary>
1997                 [Flags]
1998                 protected enum EntryType {
1999                         None            = 0x000,
2000
2001                         Instance        = 0x001,
2002                         Static          = 0x002,
2003                         MaskStatic      = Instance|Static,
2004
2005                         Public          = 0x004,
2006                         NonPublic       = 0x008,
2007                         MaskProtection  = Public|NonPublic,
2008
2009                         Declared        = 0x010,
2010
2011                         Constructor     = 0x020,
2012                         Event           = 0x040,
2013                         Field           = 0x080,
2014                         Method          = 0x100,
2015                         Property        = 0x200,
2016                         NestedType      = 0x400,
2017
2018                         NotExtensionMethod      = 0x800,
2019
2020                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
2021                 }
2022
2023                 protected class CacheEntry {
2024                         public readonly IMemberContainer Container;
2025                         public EntryType EntryType;
2026                         public readonly MemberInfo Member;
2027
2028                         public CacheEntry (IMemberContainer container, MemberInfo member,
2029                                            MemberTypes mt, BindingFlags bf)
2030                         {
2031                                 this.Container = container;
2032                                 this.Member = member;
2033                                 this.EntryType = GetEntryType (mt, bf);
2034                         }
2035
2036                         public override string ToString ()
2037                         {
2038                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
2039                                                       EntryType, Member);
2040                         }
2041                 }
2042
2043                 /// <summary>
2044                 ///   This is called each time we're walking up one level in the class hierarchy
2045                 ///   and checks whether we can abort the search since we've already found what
2046                 ///   we were looking for.
2047                 /// </summary>
2048                 protected bool DoneSearching (ArrayList list)
2049                 {
2050                         //
2051                         // We've found exactly one member in the current class and it's not
2052                         // a method or constructor.
2053                         //
2054                         if (list.Count == 1 && !(list [0] is MethodBase))
2055                                 return true;
2056
2057                         //
2058                         // Multiple properties: we query those just to find out the indexer
2059                         // name
2060                         //
2061                         if ((list.Count > 0) && (list [0] is PropertyInfo))
2062                                 return true;
2063
2064                         return false;
2065                 }
2066
2067                 /// <summary>
2068                 ///   Looks up members with name `name'.  If you provide an optional
2069                 ///   filter function, it'll only be called with members matching the
2070                 ///   requested member name.
2071                 ///
2072                 ///   This method will try to use the cache to do the lookup if possible.
2073                 ///
2074                 ///   Unlike other FindMembers implementations, this method will always
2075                 ///   check all inherited members - even when called on an interface type.
2076                 ///
2077                 ///   If you know that you're only looking for methods, you should use
2078                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
2079                 ///   When doing a method-only search, it'll try to use a special method
2080                 ///   cache (unless it's a dynamic type or an interface) and the returned
2081                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
2082                 ///   The lookup process will automatically restart itself in method-only
2083                 ///   search mode if it discovers that it's about to return methods.
2084                 /// </summary>
2085                 ArrayList global = new ArrayList ();
2086                 bool using_global = false;
2087
2088                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
2089
2090                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
2091                                                   MemberFilter filter, object criteria)
2092                 {
2093                         if (using_global)
2094                                 throw new Exception ();
2095
2096                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
2097                         bool method_search = mt == MemberTypes.Method;
2098                         // If we have a method cache and we aren't already doing a method-only search,
2099                         // then we restart a method search if the first match is a method.
2100                         bool do_method_search = !method_search && (method_hash != null);
2101
2102                         ArrayList applicable;
2103
2104                         // If this is a method-only search, we try to use the method cache if
2105                         // possible; a lookup in the method cache will return a MemberInfo with
2106                         // the correct ReflectedType for inherited methods.
2107
2108                         if (method_search && (method_hash != null))
2109                                 applicable = (ArrayList) method_hash [name];
2110                         else
2111                                 applicable = (ArrayList) member_hash [name];
2112
2113                         if (applicable == null)
2114                                 return emptyMemberInfo;
2115
2116                         //
2117                         // 32  slots gives 53 rss/54 size
2118                         // 2/4 slots gives 55 rss
2119                         //
2120                         // Strange: from 25,000 calls, only 1,800
2121                         // are above 2.  Why does this impact it?
2122                         //
2123                         global.Clear ();
2124                         using_global = true;
2125
2126                         Timer.StartTimer (TimerType.CachedLookup);
2127
2128                         EntryType type = GetEntryType (mt, bf);
2129
2130                         IMemberContainer current = Container;
2131
2132                         bool do_interface_search = current.IsInterface;
2133
2134                         // `applicable' is a list of all members with the given member name `name'
2135                         // in the current class and all its base classes.  The list is sorted in
2136                         // reverse order due to the way how the cache is initialy created (to speed
2137                         // things up, we're doing a deep-copy of our base).
2138
2139                         for (int i = applicable.Count-1; i >= 0; i--) {
2140                                 CacheEntry entry = (CacheEntry) applicable [i];
2141
2142                                 // This happens each time we're walking one level up in the class
2143                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
2144                                 // the first time this happens (this may already happen in the first
2145                                 // iteration of this loop if there are no members with the name we're
2146                                 // looking for in the current class).
2147                                 if (entry.Container != current) {
2148                                         if (declared_only)
2149                                                 break;
2150
2151                                         if (!do_interface_search && DoneSearching (global))
2152                                                 break;
2153
2154                                         current = entry.Container;
2155                                 }
2156
2157                                 // Is the member of the correct type ?
2158                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2159                                         continue;
2160
2161                                 // Is the member static/non-static ?
2162                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2163                                         continue;
2164
2165                                 // Apply the filter to it.
2166                                 if (filter (entry.Member, criteria)) {
2167                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method) {
2168                                                 do_method_search = false;
2169                                         }
2170
2171                                         // Because interfaces support multiple inheritance we have to be sure that
2172                                         // base member is from same interface, so only top level member will be returned
2173                                         if (do_interface_search && global.Count > 0) {
2174                                                 bool member_already_exists = false;
2175
2176                                                 foreach (MemberInfo mi in global) {
2177                                                         if (mi is MethodBase)
2178                                                                 continue;
2179
2180                                                         if (IsInterfaceBaseInterface (TypeManager.GetInterfaces (mi.DeclaringType), entry.Member.DeclaringType)) {
2181                                                                 member_already_exists = true;
2182                                                                 break;
2183                                                         }
2184                                                 }
2185                                                 if (member_already_exists)
2186                                                         continue;
2187                                         }
2188
2189                                         global.Add (entry.Member);
2190                                 }
2191                         }
2192
2193                         Timer.StopTimer (TimerType.CachedLookup);
2194
2195                         // If we have a method cache and we aren't already doing a method-only
2196                         // search, we restart in method-only search mode if the first match is
2197                         // a method.  This ensures that we return a MemberInfo with the correct
2198                         // ReflectedType for inherited methods.
2199                         if (do_method_search && (global.Count > 0)){
2200                                 using_global = false;
2201
2202                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2203                         }
2204
2205                         using_global = false;
2206                         MemberInfo [] copy = new MemberInfo [global.Count];
2207                         global.CopyTo (copy);
2208                         return copy;
2209                 }
2210
2211                 /// <summary>
2212                 /// Returns true if iterface exists in any base interfaces (ifaces)
2213                 /// </summary>
2214                 static bool IsInterfaceBaseInterface (Type[] ifaces, Type ifaceToFind)
2215                 {
2216                         foreach (Type iface in ifaces) {
2217                                 if (iface == ifaceToFind)
2218                                         return true;
2219
2220                                 Type[] base_ifaces = TypeManager.GetInterfaces (iface);
2221                                 if (base_ifaces.Length > 0 && IsInterfaceBaseInterface (base_ifaces, ifaceToFind))
2222                                         return true;
2223                         }
2224                         return false;
2225                 }
2226
2227                 // find the nested type @name in @this.
2228                 public Type FindNestedType (string name)
2229                 {
2230                         ArrayList applicable = (ArrayList) member_hash [name];
2231                         if (applicable == null)
2232                                 return null;
2233
2234                         for (int i = applicable.Count-1; i >= 0; i--) {
2235                                 CacheEntry entry = (CacheEntry) applicable [i];
2236                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
2237                                         return (Type) entry.Member;
2238                         }
2239
2240                         return null;
2241                 }
2242
2243                 public MemberInfo FindBaseEvent (Type invocation_type, string name)
2244                 {
2245                         ArrayList applicable = (ArrayList) member_hash [name];
2246                         if (applicable == null)
2247                                 return null;
2248
2249                         //
2250                         // Walk the chain of events, starting from the top.
2251                         //
2252                         for (int i = applicable.Count - 1; i >= 0; i--)
2253                         {
2254                                 CacheEntry entry = (CacheEntry) applicable [i];
2255                                 if ((entry.EntryType & EntryType.Event) == 0)
2256                                         continue;
2257
2258                                 EventInfo ei = (EventInfo)entry.Member;
2259                                 return ei.GetAddMethod (true);
2260                         }
2261
2262                         return null;
2263                 }
2264
2265                 //
2266                 // Looks for extension methods with defined name and extension type
2267                 //
2268                 public ArrayList FindExtensionMethods (Type extensionType, string name, bool publicOnly)
2269                 {
2270                         ArrayList entries;
2271                         if (method_hash != null)
2272                                 entries = (ArrayList)method_hash [name];
2273                         else
2274                                 entries = (ArrayList)member_hash [name];
2275
2276                         if (entries == null)
2277                                 return null;
2278
2279                         EntryType entry_type = EntryType.Static | EntryType.Method | EntryType.NotExtensionMethod;
2280                         if (publicOnly) {
2281                                 entry_type |= EntryType.Public;
2282                         }
2283                         EntryType found_entry_type = entry_type & ~EntryType.NotExtensionMethod;
2284
2285                         ArrayList candidates = null;
2286                         foreach (CacheEntry entry in entries) {
2287                                 if ((entry.EntryType & entry_type) == found_entry_type) {
2288                                         MethodBase mb = (MethodBase)entry.Member;
2289
2290                                         IMethodData md = TypeManager.GetMethod (mb);
2291                                         ParameterData pd = md == null ?
2292                                                 TypeManager.GetParameterData (mb) : md.ParameterInfo;
2293
2294                                         Type ex_type = pd.ExtensionMethodType;
2295                                         if (ex_type == null) {
2296                                                 entry.EntryType |= EntryType.NotExtensionMethod;
2297                                                 continue;
2298                                         }
2299
2300                                         //if (implicit conversion between ex_type and extensionType exist) {
2301                                                 if (candidates == null)
2302                                                         candidates = new ArrayList (2);
2303                                                 candidates.Add (mb);
2304                                         //}
2305                                 }
2306                         }
2307
2308                         return candidates;
2309                 }
2310
2311                 //
2312                 // This finds the method or property for us to override. invocation_type is the type where
2313                 // the override is going to be declared, name is the name of the method/property, and
2314                 // param_types is the parameters, if any to the method or property
2315                 //
2316                 // Because the MemberCache holds members from this class and all the base classes,
2317                 // we can avoid tons of reflection stuff.
2318                 //
2319                 public MemberInfo FindMemberToOverride (Type invocation_type, string name, Type [] param_types, GenericMethod generic_method, bool is_property)
2320                 {
2321                         ArrayList applicable;
2322                         if (method_hash != null && !is_property)
2323                                 applicable = (ArrayList) method_hash [name];
2324                         else
2325                                 applicable = (ArrayList) member_hash [name];
2326
2327                         if (applicable == null)
2328                                 return null;
2329                         //
2330                         // Walk the chain of methods, starting from the top.
2331                         //
2332                         for (int i = applicable.Count - 1; i >= 0; i--) {
2333                                 CacheEntry entry = (CacheEntry) applicable [i];
2334
2335                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2336                                         continue;
2337
2338                                 PropertyInfo pi = null;
2339                                 MethodInfo mi = null;
2340                                 FieldInfo fi = null;
2341                                 Type [] cmp_attrs = null;
2342
2343                                 if (is_property) {
2344                                         if ((entry.EntryType & EntryType.Field) != 0) {
2345                                                 fi = (FieldInfo)entry.Member;
2346
2347                                                 // TODO: For this case we ignore member type
2348                                                 //fb = TypeManager.GetField (fi);
2349                                                 //cmp_attrs = new Type[] { fb.MemberType };
2350                                         } else {
2351                                                 pi = (PropertyInfo) entry.Member;
2352                                                 cmp_attrs = TypeManager.GetArgumentTypes (pi);
2353                                         }
2354                                 } else {
2355                                         mi = (MethodInfo) entry.Member;
2356                                         cmp_attrs = TypeManager.GetParameterData (mi).Types;
2357                                 }
2358
2359                                 if (fi != null) {
2360                                         // TODO: Almost duplicate !
2361                                         // Check visibility
2362                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2363                                         case FieldAttributes.PrivateScope:
2364                                                 continue;
2365                                         case FieldAttributes.Private:
2366                                                 //
2367                                                 // A private method is Ok if we are a nested subtype.
2368                                                 // The spec actually is not very clear about this, see bug 52458.
2369                                                 //
2370                                                 if (!invocation_type.Equals (entry.Container.Type) &&
2371                                                     !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
2372                                                         continue;
2373                                                 break;
2374                                         case FieldAttributes.FamANDAssem:
2375                                         case FieldAttributes.Assembly:
2376                                                 //
2377                                                 // Check for assembly methods
2378                                                 //
2379                                                 if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2380                                                         continue;
2381                                                 break;
2382                                         }
2383                                         return entry.Member;
2384                                 }
2385
2386                                 //
2387                                 // Check the arguments
2388                                 //
2389                                 if (cmp_attrs.Length != param_types.Length)
2390                                         continue;
2391
2392                                 int j;
2393                                 for (j = 0; j < cmp_attrs.Length; ++j)
2394                                         if (!TypeManager.IsEqual (param_types [j], cmp_attrs [j]))
2395                                                 break;
2396                                 if (j < cmp_attrs.Length)
2397                                         continue;
2398
2399                                 //
2400                                 // check generic arguments for methods
2401                                 //
2402                                 if (mi != null) {
2403                                         Type [] cmpGenArgs = TypeManager.GetGenericArguments (mi);
2404                                         if (generic_method == null && cmpGenArgs.Length != 0)
2405                                                 continue;
2406                                         if (generic_method != null && cmpGenArgs.Length != generic_method.TypeParameters.Length)
2407                                                 continue;
2408                                 }
2409
2410                                 //
2411                                 // get one of the methods because this has the visibility info.
2412                                 //
2413                                 if (is_property) {
2414                                         mi = pi.GetGetMethod (true);
2415                                         if (mi == null)
2416                                                 mi = pi.GetSetMethod (true);
2417                                 }
2418
2419                                 //
2420                                 // Check visibility
2421                                 //
2422                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2423                                 case MethodAttributes.PrivateScope:
2424                                         continue;
2425                                 case MethodAttributes.Private:
2426                                         //
2427                                         // A private method is Ok if we are a nested subtype.
2428                                         // The spec actually is not very clear about this, see bug 52458.
2429                                         //
2430                                         if (!invocation_type.Equals (entry.Container.Type) &&
2431                                             !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
2432                                                 continue;
2433                                         break;
2434                                 case MethodAttributes.FamANDAssem:
2435                                 case MethodAttributes.Assembly:
2436                                         //
2437                                         // Check for assembly methods
2438                                         //
2439                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2440                                                 continue;
2441                                         break;
2442                                 }
2443                                 return entry.Member;
2444                         }
2445
2446                         return null;
2447                 }
2448
2449                 /// <summary>
2450                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2451                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2452                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2453                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2454                 /// </summary>
2455                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2456                 {
2457                         ArrayList applicable = null;
2458
2459                         if (method_hash != null)
2460                                 applicable = (ArrayList) method_hash [name];
2461
2462                         if (applicable != null) {
2463                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2464                                         CacheEntry entry = (CacheEntry) applicable [i];
2465                                         if ((entry.EntryType & EntryType.Public) != 0)
2466                                                 return entry.Member;
2467                                 }
2468                         }
2469
2470                         if (member_hash == null)
2471                                 return null;
2472                         applicable = (ArrayList) member_hash [name];
2473
2474                         if (applicable != null) {
2475                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2476                                         CacheEntry entry = (CacheEntry) applicable [i];
2477                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2478                                                 if (ignore_complex_types) {
2479                                                         if ((entry.EntryType & EntryType.Method) != 0)
2480                                                                 continue;
2481
2482                                                         // Does exist easier way how to detect indexer ?
2483                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2484                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
2485                                                                 if (arg_types.Length > 0)
2486                                                                         continue;
2487                                                         }
2488                                                 }
2489                                                 return entry.Member;
2490                                         }
2491                                 }
2492                         }
2493                         return null;
2494                 }
2495
2496                 Hashtable locase_table;
2497
2498                 /// <summary>
2499                 /// Builds low-case table for CLS Compliance test
2500                 /// </summary>
2501                 public Hashtable GetPublicMembers ()
2502                 {
2503                         if (locase_table != null)
2504                                 return locase_table;
2505
2506                         locase_table = new Hashtable ();
2507                         foreach (DictionaryEntry entry in member_hash) {
2508                                 ArrayList members = (ArrayList)entry.Value;
2509                                 for (int ii = 0; ii < members.Count; ++ii) {
2510                                         CacheEntry member_entry = (CacheEntry) members [ii];
2511
2512                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2513                                                 continue;
2514
2515                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2516                                         switch (member_entry.EntryType & EntryType.MaskType) {
2517                                                 case EntryType.Constructor:
2518                                                         continue;
2519
2520                                                 case EntryType.Field:
2521                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2522                                                                 continue;
2523                                                         break;
2524
2525                                                 case EntryType.Method:
2526                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2527                                                                 continue;
2528                                                         break;
2529
2530                                                 case EntryType.Property:
2531                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
2532                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2533                                                                 continue;
2534                                                         break;
2535
2536                                                 case EntryType.Event:
2537                                                         EventInfo ei = (EventInfo)member_entry.Member;
2538                                                         MethodInfo mi = ei.GetAddMethod ();
2539                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2540                                                                 continue;
2541                                                         break;
2542                                         }
2543                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2544                                         locase_table [lcase] = member_entry.Member;
2545                                         break;
2546                                 }
2547                         }
2548                         return locase_table;
2549                 }
2550
2551                 public Hashtable Members {
2552                         get {
2553                                 return member_hash;
2554                         }
2555                 }
2556
2557                 /// <summary>
2558                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2559                 /// </summary>
2560                 ///
2561                 // TODO: refactor as method is always 'this'
2562                 public static void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2563                 {
2564                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2565
2566                         for (int i = 0; i < al.Count; ++i) {
2567                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2568
2569                                 // skip itself
2570                                 if (entry.Member == this_builder)
2571                                         continue;
2572
2573                                 if ((entry.EntryType & tested_type) != tested_type)
2574                                         continue;
2575
2576                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2577                                 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
2578                                         method.ParameterTypes, TypeManager.GetParameterData (method_to_compare).Types);
2579
2580                                 if (result == AttributeTester.Result.Ok)
2581                                         continue;
2582
2583                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2584
2585                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2586                                 // However it is exactly what csc does.
2587                                 if (md != null && !md.IsClsComplianceRequired ())
2588                                         continue;
2589
2590                                 Report.SymbolRelatedToPreviousError (entry.Member);
2591                                 switch (result) {
2592                                         case AttributeTester.Result.RefOutArrayError:
2593                                                 Report.Error (3006, method.Location, "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
2594                                                 continue;
2595                                         case AttributeTester.Result.ArrayArrayError:
2596                                                 Report.Error (3007, method.Location, "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant", method.GetSignatureForError ());
2597                                                 continue;
2598                                 }
2599
2600                                 throw new NotImplementedException (result.ToString ());
2601                         }
2602                 }
2603
2604                 public bool CheckExistingMembersOverloads (MemberCore member, string name, Parameters parameters)
2605                 {
2606                         ArrayList entries = (ArrayList)member_hash [name];
2607                         if (entries == null)
2608                                 return true;
2609
2610                         int method_param_count = parameters.Count;
2611                         for (int i = entries.Count - 1; i >= 0; --i) {
2612                                 CacheEntry ce = (CacheEntry) entries [i];
2613
2614                                 if (ce.Container != member.Parent.PartialContainer)
2615                                         return true;
2616
2617                                 Type [] p_types;
2618                                 ParameterData pd = null;
2619                                 if ((ce.EntryType & EntryType.Property) != 0) {
2620                                         p_types = TypeManager.GetArgumentTypes ((PropertyInfo) ce.Member);
2621                                 } else {
2622                                         MethodBase mb = (MethodBase) ce.Member;
2623 #if GMCS_SOURCE
2624                                         // TODO: This is more like a hack, because we are adding generic methods
2625                                         // twice with and without arity name
2626                                         if (mb.IsGenericMethod && !member.MemberName.IsGeneric)
2627                                                 continue;
2628 #endif
2629                                         pd = TypeManager.GetParameterData (mb);
2630                                         p_types = pd.Types;
2631                                 }
2632
2633                                 if (p_types.Length != method_param_count)
2634                                         continue;
2635
2636                                 if (method_param_count > 0) {
2637                                         int ii = method_param_count - 1;
2638                                         Type type_a, type_b;
2639                                         do {
2640                                                 type_a = parameters.ParameterType (ii);
2641                                                 type_b = p_types [ii];
2642 #if GMCS_SOURCE
2643                                                 if (type_a.IsGenericParameter && type_a.DeclaringMethod != null)
2644                                                         type_a = null;
2645
2646                                                 if (type_b.IsGenericParameter && type_b.DeclaringMethod != null)
2647                                                         type_b = null;
2648 #endif
2649                                         } while (type_a == type_b && ii-- != 0);
2650
2651                                         if (ii >= 0)
2652                                                 continue;
2653
2654                                         //
2655                                         // Operators can differ in return type only
2656                                         //
2657                                         if (member is Operator) {
2658                                                 Operator op = TypeManager.GetMethod ((MethodBase) ce.Member) as Operator;
2659                                                 if (op != null && op.ReturnType != ((Operator) member).ReturnType)
2660                                                         continue;
2661                                         }
2662
2663                                         //
2664                                         // Report difference in parameter modifiers only
2665                                         //
2666                                         if (pd != null && !(member is AbstractPropertyEventMethod)) {
2667                                                 ii = method_param_count;
2668                                                 while (ii-- != 0 && parameters.ParameterModifier (ii) == pd.ParameterModifier (ii) &&
2669                                                         parameters.ExtensionMethodType == pd.ExtensionMethodType);
2670
2671                                                 if (ii >= 0) {
2672                                                         MethodCore mc = TypeManager.GetMethod ((MethodBase) ce.Member) as MethodCore;
2673                                                         Report.SymbolRelatedToPreviousError (ce.Member);
2674                                                         if ((member.ModFlags & Modifiers.PARTIAL) != 0 && (mc.ModFlags & Modifiers.PARTIAL) != 0) {
2675                                                                 if (parameters.HasParams || pd.HasParams) {
2676                                                                         Report.Error (758, member.Location,
2677                                                                                 "A partial method declaration and partial method implementation cannot differ on use of `params' modifier");
2678                                                                 } else {
2679                                                                         Report.Error (755, member.Location,
2680                                                                                 "A partial method declaration and partial method implementation must be both an extension method or neither");
2681                                                                 }
2682                                                         } else {
2683                                                                 Report.Error (663, member.Location,
2684                                                                         "An overloaded method `{0}' cannot differ on use of parameter modifiers only",
2685                                                                         member.GetSignatureForError ());
2686                                                         }
2687                                                         return false;
2688                                                 }
2689                                         }
2690                                 }
2691
2692                                 if ((ce.EntryType & EntryType.Method) != 0) {
2693                                         Method method_a = member as Method;
2694                                         Method method_b = TypeManager.GetMethod ((MethodBase) ce.Member) as Method;
2695                                         if (method_a != null && method_b != null && (method_a.ModFlags & method_b.ModFlags & Modifiers.PARTIAL) != 0) {
2696                                                 const int partial_modifiers = Modifiers.STATIC | Modifiers.UNSAFE;
2697                                                 if (method_a.IsPartialDefinition == method_b.IsPartialImplementation) {
2698                                                         if ((method_a.ModFlags & partial_modifiers) == (method_b.ModFlags & partial_modifiers) ||
2699                                                                 method_a.Parent.IsInUnsafeScope && method_b.Parent.IsInUnsafeScope) {
2700                                                                 if (method_a.IsPartialImplementation) {
2701                                                                         method_a.SetPartialDefinition (method_b);
2702                                                                         entries.RemoveAt (i);
2703                                                                 } else {
2704                                                                         method_b.SetPartialDefinition (method_a);
2705                                                                 }
2706                                                                 continue;
2707                                                         }
2708
2709                                                         if ((method_a.ModFlags & Modifiers.STATIC) != (method_b.ModFlags & Modifiers.STATIC)) {
2710                                                                 Report.SymbolRelatedToPreviousError (ce.Member);
2711                                                                 Report.Error (763, member.Location,
2712                                                                         "A partial method declaration and partial method implementation must be both `static' or neither");
2713                                                         }
2714
2715                                                         Report.SymbolRelatedToPreviousError (ce.Member);
2716                                                         Report.Error (764, member.Location,
2717                                                                 "A partial method declaration and partial method implementation must be both `unsafe' or neither");
2718                                                         return false;
2719                                                 }
2720
2721                                                 Report.SymbolRelatedToPreviousError (ce.Member);
2722                                                 if (method_a.IsPartialDefinition) {
2723                                                         Report.Error (756, member.Location, "A partial method `{0}' declaration is already defined",
2724                                                                 member.GetSignatureForError ());
2725                                                 }
2726
2727                                                 Report.Error (757, member.Location, "A partial method `{0}' implementation is already defined",
2728                                                         member.GetSignatureForError ());
2729                                                 return false;
2730                                         }
2731
2732                                         Report.SymbolRelatedToPreviousError (ce.Member);
2733                                         IMethodData duplicate_member = TypeManager.GetMethod ((MethodBase) ce.Member);
2734                                         if (member is Operator && duplicate_member is Operator) {
2735                                                 Report.Error (557, member.Location, "Duplicate user-defined conversion in type `{0}'",
2736                                                         member.Parent.GetSignatureForError ());
2737                                                 return false;
2738                                         }
2739
2740                                         bool is_reserved_a = member is AbstractPropertyEventMethod || member is Operator;
2741                                         bool is_reserved_b = duplicate_member is AbstractPropertyEventMethod || duplicate_member is Operator;
2742
2743                                         if (is_reserved_a || is_reserved_b) {
2744                                                 Report.Error (82, member.Location, "A member `{0}' is already reserved",
2745                                                         is_reserved_a ?
2746                                                         TypeManager.GetFullNameSignature (ce.Member) :
2747                                                         member.GetSignatureForError ());
2748                                                 return false;
2749                                         }
2750                                 } else {
2751                                         Report.SymbolRelatedToPreviousError (ce.Member);
2752                                 }
2753
2754                                 Report.Error (111, member.Location,
2755                                         "A member `{0}' is already defined. Rename this member or use different parameter types",
2756                                         member.GetSignatureForError ());
2757                                 return false;
2758                         }
2759
2760                         return true;
2761                 }
2762         }
2763 }