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 // Dual licensed under the terms of the MIT X11 or GNU GPL
   8 //
   9 // Copyright 2001 Ximian, Inc (http://www.ximian.com)
  10 // Copyright 2004-2008 Novell, Inc
  11 //
  12 //
  13
  14 using System;
  15 using System.Text;
  16 using System.Collections;
  17 using System.Globalization;
  18 using System.Reflection.Emit;
  19 using System.Reflection;
  20
  21 #if BOOTSTRAP_WITH_OLDLIB || NET_2_1
  22 using XmlElement = System.Object;
  23 #else
  24 using System.Xml;
  25 #endif
  26
  27 namespace Mono.CSharp {
  28
  29         //
  30         // Better name would be DottenName
  31         //
  32         public class MemberName {
  33                 public readonly string Name;
  34                 public readonly TypeArguments TypeArguments;
  35
  36                 public readonly MemberName Left;
  37                 public readonly Location Location;
  38
  39                 public static readonly MemberName Null = new MemberName ("");
  40
  41                 bool is_double_colon;
  42
  43                 private MemberName (MemberName left, string name, bool is_double_colon,
  44                                     Location loc)
  45                 {
  46                         this.Name = name;
  47                         this.Location = loc;
  48                         this.is_double_colon = is_double_colon;
  49                         this.Left = left;
  50                 }
  51
  52                 private MemberName (MemberName left, string name, bool is_double_colon,
  53                                     TypeArguments args, Location loc)
  54                         : this (left, name, is_double_colon, loc)
  55                 {
  56                         if (args != null && args.Count > 0)
  57                                 this.TypeArguments = args;
  58                 }
  59
  60                 public MemberName (string name)
  61                         : this (name, Location.Null)
  62                 { }
  63
  64                 public MemberName (string name, Location loc)
  65                         : this (null, name, false, loc)
  66                 { }
  67
  68                 public MemberName (string name, TypeArguments args, Location loc)
  69                         : this (null, name, false, args, loc)
  70                 { }
  71
  72                 public MemberName (MemberName left, string name)
  73                         : this (left, name, left != null ? left.Location : Location.Null)
  74                 { }
  75
  76                 public MemberName (MemberName left, string name, Location loc)
  77                         : this (left, name, false, loc)
  78                 { }
  79
  80                 public MemberName (MemberName left, string name, TypeArguments args, Location loc)
  81                         : this (left, name, false, args, loc)
  82                 { }
  83
  84                 public MemberName (string alias, string name, TypeArguments args, Location loc)
  85                         : this (new MemberName (alias, loc), name, true, args, loc)
  86                 { }
  87
  88                 public MemberName (MemberName left, MemberName right)
  89                         : this (left, right, right.Location)
  90                 { }
  91
  92                 public MemberName (MemberName left, MemberName right, Location loc)
  93                         : this (null, right.Name, false, right.TypeArguments, loc)
  94                 {
  95                         if (right.is_double_colon)
  96                                 throw new InternalErrorException ("Cannot append double_colon member name");
  97                         this.Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  98                 }
  99
 100                 // TODO: Remove
 101                 public string GetName ()
 102                 {
 103                         return GetName (false);
 104                 }
 105
 106                 public bool IsGeneric {
 107                         get {
 108                                 if (TypeArguments != null)
 109                                         return true;
 110                                 else if (Left != null)
 111                                         return Left.IsGeneric;
 112                                 else
 113                                         return false;
 114                         }
 115                 }
 116
 117                 public string GetName (bool is_generic)
 118                 {
 119                         string name = is_generic ? Basename : Name;
 120                         if (Left != null)
 121                                 return Left.GetName (is_generic) + (is_double_colon ? "::" : ".") + name;
 122
 123                         return name;
 124                 }
 125
 126                 public ATypeNameExpression GetTypeExpression ()
 127                 {
 128                         if (Left == null) {
 129                                 if (TypeArguments != null)
 130                                         return new SimpleName (Basename, TypeArguments, Location);
 131
 132                                 return new SimpleName (Name, Location);
 133                         }
 134
 135                         if (is_double_colon) {
 136                                 if (Left.Left != null)
 137                                         throw new InternalErrorException ("The left side of a :: should be an identifier");
 138                                 return new QualifiedAliasMember (Left.Name, Name, TypeArguments, Location);
 139                         }
 140
 141                         Expression lexpr = Left.GetTypeExpression ();
 142                         return new MemberAccess (lexpr, Name, TypeArguments, Location);
 143                 }
 144
 145                 public MemberName Clone ()
 146                 {
 147                         MemberName left_clone = Left == null ? null : Left.Clone ();
 148                         return new MemberName (left_clone, Name, is_double_colon, TypeArguments, Location);
 149                 }
 150
 151                 public string Basename {
 152                         get {
 153                                 if (TypeArguments != null)
 154                                         return MakeName (Name, TypeArguments);
 155                                 return Name;
 156                         }
 157                 }
 158
 159                 public string GetSignatureForError ()
 160                 {
 161                         string append = TypeArguments == null ? "" : "<" + TypeArguments.GetSignatureForError () + ">";
 162                         if (Left == null)
 163                                 return Name + append;
 164                         string connect = is_double_colon ? "::" : ".";
 165                         return Left.GetSignatureForError () + connect + Name + append;
 166                 }
 167
 168                 public override bool Equals (object other)
 169                 {
 170                         return Equals (other as MemberName);
 171                 }
 172
 173                 public bool Equals (MemberName other)
 174                 {
 175                         if (this == other)
 176                                 return true;
 177                         if (other == null || Name != other.Name)
 178                                 return false;
 179                         if (is_double_colon != other.is_double_colon)
 180                                 return false;
 181
 182                         if ((TypeArguments != null) &&
 183                             (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count))
 184                                 return false;
 185
 186                         if ((TypeArguments == null) && (other.TypeArguments != null))
 187                                 return false;
 188
 189                         if (Left == null)
 190                                 return other.Left == null;
 191
 192                         return Left.Equals (other.Left);
 193                 }
 194
 195                 public override int GetHashCode ()
 196                 {
 197                         int hash = Name.GetHashCode ();
 198                         for (MemberName n = Left; n != null; n = n.Left)
 199                                 hash ^= n.Name.GetHashCode ();
 200                         if (is_double_colon)
 201                                 hash ^= 0xbadc01d;
 202
 203                         if (TypeArguments != null)
 204                                 hash ^= TypeArguments.Count << 5;
 205
 206                         return hash & 0x7FFFFFFF;
 207                 }
 208
 209                 public int CountTypeArguments {
 210                         get {
 211                                 if (TypeArguments != null)
 212                                         return TypeArguments.Count;
 213                                 else if (Left != null)
 214                                         return Left.CountTypeArguments;
 215                                 else
 216                                         return 0;
 217                         }
 218                 }
 219
 220                 public static string MakeName (string name, TypeArguments args)
 221                 {
 222                         if (args == null)
 223                                 return name;
 224                         else
 225                                 return name + "`" + args.Count;
 226                 }
 227
 228                 public static string MakeName (string name, int count)
 229                 {
 230                         return name + "`" + count;
 231                 }
 232         }
 233
 234         /// <summary>
 235         ///   Base representation for members.  This is used to keep track
 236         ///   of Name, Location and Modifier flags, and handling Attributes.
 237         /// </summary>
 238         public abstract class MemberCore : Attributable, IResolveContext {
 239                 /// <summary>
 240                 ///   Public name
 241                 /// </summary>
 242
 243                 protected string cached_name;
 244                 // TODO: Remove in favor of MemberName
 245                 public string Name {
 246                         get {
 247                                 if (cached_name == null)
 248                                         cached_name = MemberName.GetName (!(this is GenericMethod) && !(this is Method));
 249                                 return cached_name;
 250                         }
 251                 }
 252
 253                 // Is not readonly because of IndexerName attribute
 254                 private MemberName member_name;
 255                 public MemberName MemberName {
 256                         get { return member_name; }
 257                 }
 258
 259                 /// <summary>
 260                 ///   Modifier flags that the user specified in the source code
 261                 /// </summary>
 262                 private int mod_flags;
 263                 public int ModFlags {
 264                         set {
 265                                 mod_flags = value;
 266                                 if ((value & Modifiers.COMPILER_GENERATED) != 0)
 267                                         caching_flags = Flags.IsUsed | Flags.IsAssigned;
 268                         }
 269                         get {
 270                                 return mod_flags;
 271                         }
 272                 }
 273
 274                 public /*readonly*/ DeclSpace Parent;
 275
 276                 /// <summary>
 277                 ///   Location where this declaration happens
 278                 /// </summary>
 279                 public Location Location {
 280                         get { return member_name.Location; }
 281                 }
 282
 283                 /// <summary>
 284                 ///   XML documentation comment
 285                 /// </summary>
 286                 protected string comment;
 287
 288                 /// <summary>
 289                 ///   Represents header string for documentation comment
 290                 ///   for each member types.
 291                 /// </summary>
 292                 public abstract string DocCommentHeader { get; }
 293
 294                 [Flags]
 295                 public enum Flags {
 296                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 297                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 298                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 299                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 300                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 301                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 302                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 303                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 304                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 305                         Excluded = 1 << 9,                                      // Method is conditional
 306                         MethodOverloadsExist = 1 << 10,         // Test for duplication must be performed
 307                         IsUsed = 1 << 11,
 308                         IsAssigned = 1 << 12,                           // Field is assigned
 309                         HasExplicitLayout       = 1 << 13,
 310                         PartialDefinitionExists = 1 << 14,      // Set when corresponding partial method definition exists
 311                         HasStructLayout         = 1 << 15                       // Has StructLayoutAttribute
 312                 }
 313
 314                 /// <summary>
 315                 ///   MemberCore flags at first detected then cached
 316                 /// </summary>
 317                 internal Flags caching_flags;
 318
 319                 public MemberCore (DeclSpace parent, MemberName name, Attributes attrs)
 320                         : base (attrs)
 321                 {
 322                         this.Parent = parent;
 323                         member_name = name;
 324                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 325                 }
 326
 327                 protected virtual void SetMemberName (MemberName new_name)
 328                 {
 329                         member_name = new_name;
 330                         cached_name = null;
 331                 }
 332
 333                 protected bool CheckAbstractAndExtern (bool has_block)
 334                 {
 335                         if (Parent.PartialContainer.Kind == Kind.Interface)
 336                                 return true;
 337
 338                         if (has_block) {
 339                                 if ((ModFlags & Modifiers.EXTERN) != 0) {
 340                                         Report.Error (179, Location, "`{0}' cannot declare a body because it is marked extern",
 341                                                 GetSignatureForError ());
 342                                         return false;
 343                                 }
 344
 345                                 if ((ModFlags & Modifiers.ABSTRACT) != 0) {
 346                                         Report.Error (500, Location, "`{0}' cannot declare a body because it is marked abstract",
 347                                                 GetSignatureForError ());
 348                                         return false;
 349                                 }
 350                         } else {
 351                                 if ((ModFlags & (Modifiers.ABSTRACT | Modifiers.EXTERN | Modifiers.PARTIAL)) == 0) {
 352                                         if (RootContext.Version >= LanguageVersion.LINQ && this is Property.PropertyMethod &&
 353                                                 !(this is Indexer.GetIndexerMethod || this is Indexer.SetIndexerMethod)) {
 354                                                 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",
 355                                                               GetSignatureForError ());
 356                                         } else {
 357                                                 Report.Error (501, Location, "`{0}' must have a body because it is not marked abstract, extern, or partial",
 358                                                               GetSignatureForError ());
 359                                         }
 360                                         return false;
 361                                 }
 362                         }
 363
 364                         return true;
 365                 }
 366
 367                 public void CheckProtectedModifier ()
 368                 {
 369                         if ((ModFlags & Modifiers.PROTECTED) == 0)
 370                                 return;
 371
 372                         if (Parent.PartialContainer.Kind == Kind.Struct) {
 373                                 Report.Error (666, Location, "`{0}': Structs cannot contain protected members",
 374                                         GetSignatureForError ());
 375                                 return;
 376                         }
 377
 378                         if ((Parent.ModFlags & Modifiers.STATIC) != 0) {
 379                                 Report.Error (1057, Location, "`{0}': Static classes cannot contain protected members",
 380                                         GetSignatureForError ());
 381                                 return;
 382                         }
 383
 384                         if (((Parent.ModFlags & Modifiers.SEALED) != 0) &&
 385                                 ((ModFlags & Modifiers.OVERRIDE) == 0) && (Name != "Finalize")) {
 386                                 Report.Warning (628, 4, Location, "`{0}': new protected member declared in sealed class",
 387                                         GetSignatureForError ());
 388                                 return;
 389                         }
 390                 }
 391
 392                 public abstract bool Define ();
 393
 394                 public virtual string DocComment {
 395                         get {
 396                                 return comment;
 397                         }
 398                         set {
 399                                 comment = value;
 400                         }
 401                 }
 402
 403                 //
 404                 // Returns full member name for error message
 405                 //
 406                 public virtual string GetSignatureForError ()
 407                 {
 408                         if (Parent == null || Parent.Parent == null)
 409                                 return member_name.GetSignatureForError ();
 410
 411                         return Parent.GetSignatureForError () + "." + member_name.GetSignatureForError ();
 412                 }
 413
 414                 /// <summary>
 415                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 416                 /// </summary>
 417                 public virtual void Emit ()
 418                 {
 419                         if (!RootContext.VerifyClsCompliance)
 420                                 return;
 421
 422                         if (Report.WarningLevel > 0)
 423                                 VerifyClsCompliance ();
 424                 }
 425
 426                 public bool IsCompilerGenerated {
 427                         get     {
 428                                 if ((mod_flags & Modifiers.COMPILER_GENERATED) != 0)
 429                                         return true;
 430
 431                                 return Parent == null ? false : Parent.IsCompilerGenerated;
 432                         }
 433                 }
 434
 435                 public virtual bool IsUsed {
 436                         get { return (caching_flags & Flags.IsUsed) != 0; }
 437                 }
 438
 439                 public void SetMemberIsUsed ()
 440                 {
 441                         caching_flags |= Flags.IsUsed;
 442                 }
 443
 444                 /// <summary>
 445                 /// Returns instance of ObsoleteAttribute for this MemberCore
 446                 /// </summary>
 447                 public virtual ObsoleteAttribute GetObsoleteAttribute ()
 448                 {
 449                         if ((caching_flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0)
 450                                 return null;
 451
 452                         caching_flags &= ~Flags.Obsolete_Undetected;
 453
 454                         if (OptAttributes == null || TypeManager.obsolete_attribute_type == null)
 455                                 return null;
 456
 457                         Attribute obsolete_attr = OptAttributes.Search (TypeManager.obsolete_attribute_type);
 458                         if (obsolete_attr == null)
 459                                 return null;
 460
 461                         caching_flags |= Flags.Obsolete;
 462
 463                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute ();
 464                         if (obsolete == null)
 465                                 return null;
 466
 467                         return obsolete;
 468                 }
 469
 470                 /// <summary>
 471                 /// Checks for ObsoleteAttribute presence. It's used for testing of all non-types elements
 472                 /// </summary>
 473                 public virtual void CheckObsoleteness (Location loc)
 474                 {
 475                         ObsoleteAttribute oa = GetObsoleteAttribute ();
 476                         if (oa != null)
 477                                 AttributeTester.Report_ObsoleteMessage (oa, GetSignatureForError (), loc);
 478                 }
 479
 480                 // Access level of a type.
 481                 const int X = 1;
 482                 enum AccessLevel
 483                 { // Each column represents `is this scope larger or equal to Blah scope'
 484                         // Public    Assembly   Protected
 485                         Protected = (0 << 0) | (0 << 1) | (X << 2),
 486                         Public = (X << 0) | (X << 1) | (X << 2),
 487                         Private = (0 << 0) | (0 << 1) | (0 << 2),
 488                         Internal = (0 << 0) | (X << 1) | (0 << 2),
 489                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 490                 }
 491
 492                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 493                 {
 494                         if ((flags & Modifiers.INTERNAL) != 0) {
 495
 496                                 if ((flags & Modifiers.PROTECTED) != 0)
 497                                         return AccessLevel.ProtectedOrInternal;
 498                                 else
 499                                         return AccessLevel.Internal;
 500
 501                         } else if ((flags & Modifiers.PROTECTED) != 0)
 502                                 return AccessLevel.Protected;
 503                         else if ((flags & Modifiers.PRIVATE) != 0)
 504                                 return AccessLevel.Private;
 505                         else
 506                                 return AccessLevel.Public;
 507                 }
 508
 509                 //
 510                 // Returns the access level for type `t'
 511                 //
 512                 static AccessLevel GetAccessLevelFromType (Type t)
 513                 {
 514                         if (t.IsPublic)
 515                                 return AccessLevel.Public;
 516                         if (t.IsNestedPrivate)
 517                                 return AccessLevel.Private;
 518                         if (t.IsNotPublic)
 519                                 return AccessLevel.Internal;
 520
 521                         if (t.IsNestedPublic)
 522                                 return AccessLevel.Public;
 523                         if (t.IsNestedAssembly)
 524                                 return AccessLevel.Internal;
 525                         if (t.IsNestedFamily)
 526                                 return AccessLevel.Protected;
 527                         if (t.IsNestedFamORAssem)
 528                                 return AccessLevel.ProtectedOrInternal;
 529                         if (t.IsNestedFamANDAssem)
 530                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 531
 532                         // nested private is taken care of
 533
 534                         throw new Exception ("I give up, what are you?");
 535                 }
 536
 537                 //
 538                 // Checks whether the type P is as accessible as this member
 539                 //
 540                 public bool IsAccessibleAs (Type p)
 541                 {
 542                         //
 543                         // if M is private, its accessibility is the same as this declspace.
 544                         // we already know that P is accessible to T before this method, so we
 545                         // may return true.
 546                         //
 547                         if ((mod_flags & Modifiers.PRIVATE) != 0)
 548                                 return true;
 549
 550                         while (TypeManager.HasElementType (p))
 551                                 p = TypeManager.GetElementType (p);
 552
 553 #if GMCS_SOURCE
 554                         if (p.IsGenericParameter)
 555                                 return true;
 556
 557                         if (TypeManager.IsGenericType (p)) {
 558                                 foreach (Type t in p.GetGenericArguments ()) {
 559                                         if (!IsAccessibleAs (t))
 560                                                 return false;
 561                                 }
 562                         }
 563 #endif
 564
 565                         for (Type p_parent = null; p != null; p = p_parent) {
 566                                 p_parent = p.DeclaringType;
 567                                 AccessLevel pAccess = GetAccessLevelFromType (p);
 568                                 if (pAccess == AccessLevel.Public)
 569                                         continue;
 570
 571                                 bool same_access_restrictions = false;
 572                                 for (MemberCore mc = this; !same_access_restrictions && mc != null && mc.Parent != null; mc = mc.Parent) {
 573                                         AccessLevel al = GetAccessLevelFromModifiers (mc.ModFlags);
 574                                         switch (pAccess) {
 575                                         case AccessLevel.Internal:
 576                                                 if (al == AccessLevel.Private || al == AccessLevel.Internal)
 577                                                         same_access_restrictions = TypeManager.IsThisOrFriendAssembly (p.Assembly);
 578
 579                                                 break;
 580
 581                                         case AccessLevel.Protected:
 582                                                 if (al == AccessLevel.Protected) {
 583                                                         same_access_restrictions = mc.Parent.IsBaseType (p_parent);
 584                                                         break;
 585                                                 }
 586
 587                                                 if (al == AccessLevel.Private) {
 588                                                         //
 589                                                         // When type is private and any of its parents derives from
 590                                                         // protected type then the type is accessible
 591                                                         //
 592                                                         while (mc.Parent != null) {
 593                                                                 if (mc.Parent.IsBaseType (p_parent))
 594                                                                         same_access_restrictions = true;
 595                                                                 mc = mc.Parent;
 596                                                         }
 597                                                 }
 598
 599                                                 break;
 600
 601                                         case AccessLevel.ProtectedOrInternal:
 602                                                 if (al == AccessLevel.Protected)
 603                                                         same_access_restrictions = mc.Parent.IsBaseType (p_parent);
 604                                                 else if (al == AccessLevel.Internal)
 605                                                         same_access_restrictions = TypeManager.IsThisOrFriendAssembly (p.Assembly);
 606                                                 else if (al == AccessLevel.ProtectedOrInternal)
 607                                                         same_access_restrictions = mc.Parent.IsBaseType (p_parent) &&
 608                                                                 TypeManager.IsThisOrFriendAssembly (p.Assembly);
 609
 610                                                 break;
 611
 612                                         case AccessLevel.Private:
 613                                                 //
 614                                                 // Both are private and share same parent
 615                                                 //
 616                                                 if (al == AccessLevel.Private)
 617                                                         same_access_restrictions = TypeManager.IsEqual (mc.Parent.TypeBuilder, p_parent);
 618
 619                                                 break;
 620
 621                                         default:
 622                                                 throw new InternalErrorException (al.ToString ());
 623                                         }
 624                                 }
 625
 626                                 if (!same_access_restrictions)
 627                                         return false;
 628                         }
 629
 630                         return true;
 631                 }
 632
 633                 /// <summary>
 634                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 635                 /// </summary>
 636                 public override bool IsClsComplianceRequired ()
 637                 {
 638                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 639                                 return (caching_flags & Flags.ClsCompliant) != 0;
 640
 641                         if (GetClsCompliantAttributeValue () && IsExposedFromAssembly ()) {
 642                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 643                                 caching_flags |= Flags.ClsCompliant;
 644                                 return true;
 645                         }
 646
 647                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 648                         return false;
 649                 }
 650
 651                 /// <summary>
 652                 /// Returns true when MemberCore is exposed from assembly.
 653                 /// </summary>
 654                 public bool IsExposedFromAssembly ()
 655                 {
 656                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 657                                 return false;
 658
 659                         DeclSpace parentContainer = Parent;
 660                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 661                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 662                                         return false;
 663                                 parentContainer = parentContainer.Parent;
 664                         }
 665                         return true;
 666                 }
 667
 668                 /// <summary>
 669                 /// Goes through class hierarchy and gets value of first found CLSCompliantAttribute.
 670                 /// If no is attribute exists then assembly CLSCompliantAttribute is returned.
 671                 /// </summary>
 672                 public virtual bool GetClsCompliantAttributeValue ()
 673                 {
 674                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
 675                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
 676
 677                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
 678
 679                         if (OptAttributes != null && TypeManager.cls_compliant_attribute_type != null) {
 680                                 Attribute cls_attribute = OptAttributes.Search (
 681                                         TypeManager.cls_compliant_attribute_type);
 682                                 if (cls_attribute != null) {
 683                                         caching_flags |= Flags.HasClsCompliantAttribute;
 684                                         bool value = cls_attribute.GetClsCompliantAttributeValue ();
 685                                         if (value)
 686                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 687                                         return value;
 688                                 }
 689                         }
 690
 691                         // It's null for TypeParameter
 692                         if (Parent == null)
 693                                 return false;
 694
 695                         if (Parent.GetClsCompliantAttributeValue ()) {
 696                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 697                                 return true;
 698                         }
 699                         return false;
 700                 }
 701
 702                 /// <summary>
 703                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 704                 /// </summary>
 705                 protected bool HasClsCompliantAttribute {
 706                         get {
 707                                 if ((caching_flags & Flags.HasCompliantAttribute_Undetected) != 0)
 708                                         GetClsCompliantAttributeValue ();
 709
 710                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 711                         }
 712                 }
 713
 714                 /// <summary>
 715                 /// Returns true when a member supports multiple overloads (methods, indexers, etc)
 716                 /// </summary>
 717                 public virtual bool EnableOverloadChecks (MemberCore overload)
 718                 {
 719                         return false;
 720                 }
 721
 722                 /// <summary>
 723                 /// The main virtual method for CLS-Compliant verifications.
 724                 /// The method returns true if member is CLS-Compliant and false if member is not
 725                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 726                 /// and add their extra verifications.
 727                 /// </summary>
 728                 protected virtual bool VerifyClsCompliance ()
 729                 {
 730                         if (!IsClsComplianceRequired ()) {
 731                                 if (HasClsCompliantAttribute && Report.WarningLevel >= 2) {
 732                                         if (!IsExposedFromAssembly ())
 733                                                 Report.Warning (3019, 2, Location, "CLS compliance checking will not be performed on `{0}' because it is not visible from outside this assembly", GetSignatureForError ());
 734                                         if (!CodeGen.Assembly.IsClsCompliant)
 735                                                 Report.Warning (3021, 2, Location, "`{0}' does not need a CLSCompliant attribute because the assembly is not marked as CLS-compliant", GetSignatureForError ());
 736                                 }
 737                                 return false;
 738                         }
 739
 740                         if (HasClsCompliantAttribute) {
 741                                 if (CodeGen.Assembly.ClsCompliantAttribute == null && !CodeGen.Assembly.IsClsCompliant) {
 742                                         Report.Warning (3014, 1, Location,
 743                                                 "`{0}' cannot be marked as CLS-compliant because the assembly is not marked as CLS-compliant",
 744                                                 GetSignatureForError ());
 745                                         return false;
 746                                 }
 747
 748                                 if (!Parent.IsClsComplianceRequired ()) {
 749                                         Report.Warning (3018, 1, Location, "`{0}' cannot be marked as CLS-compliant because it is a member of non CLS-compliant type `{1}'",
 750                                                 GetSignatureForError (), Parent.GetSignatureForError ());
 751                                         return false;
 752                                 }
 753                         }
 754
 755                         if (member_name.Name [0] == '_') {
 756                                 Report.Warning (3008, 1, Location, "Identifier `{0}' is not CLS-compliant", GetSignatureForError () );
 757                         }
 758                         return true;
 759                 }
 760
 761                 //
 762                 // Raised (and passed an XmlElement that contains the comment)
 763                 // when GenerateDocComment is writing documentation expectedly.
 764                 //
 765                 internal virtual void OnGenerateDocComment (XmlElement intermediateNode)
 766                 {
 767                 }
 768
 769                 //
 770                 // Returns a string that represents the signature for this
 771                 // member which should be used in XML documentation.
 772                 //
 773                 public virtual string GetDocCommentName (DeclSpace ds)
 774                 {
 775                         if (ds == null || this is DeclSpace)
 776                                 return DocCommentHeader + Name;
 777                         else
 778                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 779                 }
 780
 781                 //
 782                 // Generates xml doc comments (if any), and if required,
 783                 // handle warning report.
 784                 //
 785                 internal virtual void GenerateDocComment (DeclSpace ds)
 786                 {
 787                         try {
 788                                 DocUtil.GenerateDocComment (this, ds);
 789                         } catch (Exception e) {
 790                                 throw new InternalErrorException (this, e);
 791                         }
 792                 }
 793
 794                 public override IResolveContext ResolveContext {
 795                         get { return this; }
 796                 }
 797
 798                 #region IResolveContext Members
 799
 800                 public DeclSpace DeclContainer {
 801                         get { return Parent; }
 802                 }
 803
 804                 public virtual DeclSpace GenericDeclContainer {
 805                         get { return DeclContainer; }
 806                 }
 807
 808                 public bool IsInObsoleteScope {
 809                         get {
 810                                 if (GetObsoleteAttribute () != null)
 811                                         return true;
 812
 813                                 return Parent == null ? false : Parent.IsInObsoleteScope;
 814                         }
 815                 }
 816
 817                 public bool IsInUnsafeScope {
 818                         get {
 819                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 820                                         return true;
 821
 822                                 return Parent == null ? false : Parent.IsInUnsafeScope;
 823                         }
 824                 }
 825
 826                 #endregion
 827         }
 828
 829         /// <summary>
 830         ///   Base class for structs, classes, enumerations and interfaces.
 831         /// </summary>
 832         /// <remarks>
 833         ///   They all create new declaration spaces.  This
 834         ///   provides the common foundation for managing those name
 835         ///   spaces.
 836         /// </remarks>
 837         public abstract class DeclSpace : MemberCore {
 838                 /// <summary>
 839                 ///   This points to the actual definition that is being
 840                 ///   created with System.Reflection.Emit
 841                 /// </summary>
 842                 public TypeBuilder TypeBuilder;
 843
 844                 /// <summary>
 845                 ///   If we are a generic type, this is the type we are
 846                 ///   currently defining.  We need to lookup members on this
 847                 ///   instead of the TypeBuilder.
 848                 /// </summary>
 849                 public Type CurrentType;
 850
 851                 //
 852                 // This is the namespace in which this typecontainer
 853                 // was declared.  We use this to resolve names.
 854                 //
 855                 public NamespaceEntry NamespaceEntry;
 856
 857                 private Hashtable Cache = new Hashtable ();
 858
 859                 public readonly string Basename;
 860
 861                 protected Hashtable defined_names;
 862
 863                 public TypeContainer PartialContainer;
 864
 865                 protected readonly bool is_generic;
 866                 readonly int count_type_params;
 867
 868                 //
 869                 // Whether we are Generic
 870                 //
 871                 public bool IsGeneric {
 872                         get {
 873                                 if (is_generic)
 874                                         return true;
 875                                 else if (Parent != null)
 876                                         return Parent.IsGeneric;
 877                                 else
 878                                         return false;
 879                         }
 880                 }
 881
 882                 static string[] attribute_targets = new string [] { "type" };
 883
 884                 public DeclSpace (NamespaceEntry ns, DeclSpace parent, MemberName name,
 885                                   Attributes attrs)
 886                         : base (parent, name, attrs)
 887                 {
 888                         NamespaceEntry = ns;
 889                         Basename = name.Basename;
 890                         defined_names = new Hashtable ();
 891                         PartialContainer = null;
 892                         if (name.TypeArguments != null) {
 893                                 is_generic = true;
 894                                 count_type_params = name.TypeArguments.Count;
 895                         }
 896                         if (parent != null)
 897                                 count_type_params += parent.count_type_params;
 898                 }
 899
 900                 public override DeclSpace GenericDeclContainer {
 901                         get { return this; }
 902                 }
 903
 904                 /// <summary>
 905                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 906                 /// </summary>
 907                 protected virtual bool AddToContainer (MemberCore symbol, string name)
 908                 {
 909                         MemberCore mc = (MemberCore) defined_names [name];
 910
 911                         if (mc == null) {
 912                                 defined_names.Add (name, symbol);
 913                                 return true;
 914                         }
 915
 916                         if (symbol.EnableOverloadChecks (mc))
 917                                 return true;
 918
 919                         Report.SymbolRelatedToPreviousError (mc);
 920                         if ((mc.ModFlags & Modifiers.PARTIAL) != 0 && (symbol is ClassOrStruct || symbol is Interface)) {
 921                                 Error_MissingPartialModifier (symbol);
 922                                 return false;
 923                         }
 924
 925                         if (this is RootTypes) {
 926                                 Report.Error (101, symbol.Location,
 927                                         "The namespace `{0}' already contains a definition for `{1}'",
 928                                         ((DeclSpace)symbol).NamespaceEntry.GetSignatureForError (), symbol.MemberName.Name);
 929                         } else if (symbol is TypeParameter) {
 930                                 Report.Error (692, symbol.Location,
 931                                         "Duplicate type parameter `{0}'", symbol.GetSignatureForError ());
 932                         } else {
 933                                 Report.Error (102, symbol.Location,
 934                                               "The type `{0}' already contains a definition for `{1}'",
 935                                               GetSignatureForError (), symbol.MemberName.Name);
 936                         }
 937
 938                         return false;
 939                 }
 940
 941                 protected void RemoveFromContainer (string name)
 942                 {
 943                         defined_names.Remove (name);
 944                 }
 945
 946                 /// <summary>
 947                 ///   Returns the MemberCore associated with a given name in the declaration
 948                 ///   space. It doesn't return method based symbols !!
 949                 /// </summary>
 950                 ///
 951                 public MemberCore GetDefinition (string name)
 952                 {
 953                         return (MemberCore)defined_names [name];
 954                 }
 955
 956                 public bool IsStaticClass {
 957                         get { return (ModFlags & Modifiers.STATIC) != 0; }
 958                 }
 959
 960                 //
 961                 // root_types contains all the types.  All TopLevel types
 962                 // hence have a parent that points to `root_types', that is
 963                 // why there is a non-obvious test down here.
 964                 //
 965                 public bool IsTopLevel {
 966                         get { return (Parent != null && Parent.Parent == null); }
 967                 }
 968
 969                 public virtual void CloseType ()
 970                 {
 971                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 972                                 try {
 973                                         TypeBuilder.CreateType ();
 974                                 } catch {
 975                                         //
 976                                         // The try/catch is needed because
 977                                         // nested enumerations fail to load when they
 978                                         // are defined.
 979                                         //
 980                                         // Even if this is the right order (enumerations
 981                                         // declared after types).
 982                                         //
 983                                         // Note that this still creates the type and
 984                                         // it is possible to save it
 985                                 }
 986                                 caching_flags |= Flags.CloseTypeCreated;
 987                         }
 988                 }
 989
 990                 protected virtual TypeAttributes TypeAttr {
 991                         get { return CodeGen.Module.DefaultCharSetType; }
 992                 }
 993
 994                 /// <remarks>
 995                 ///  Should be overriten by the appropriate declaration space
 996                 /// </remarks>
 997                 public abstract TypeBuilder DefineType ();
 998
 999                 protected void Error_MissingPartialModifier (MemberCore type)
1000                 {
1001                         Report.Error (260, type.Location,
1002                                 "Missing partial modifier on declaration of type `{0}'. Another partial declaration of this type exists",
1003                                 type.GetSignatureForError ());
1004                 }
1005
1006                 public override void Emit ()
1007                 {
1008 #if GMCS_SOURCE
1009                         if (type_params != null) {
1010                                 int offset = count_type_params - type_params.Length;
1011                                 for (int i = offset; i < type_params.Length; i++)
1012                                         CurrentTypeParameters [i - offset].Emit ();
1013                         }
1014
1015                         if ((ModFlags & Modifiers.COMPILER_GENERATED) != 0 && !Parent.IsCompilerGenerated)
1016                                 TypeBuilder.SetCustomAttribute (TypeManager.GetCompilerGeneratedAttribute (Location));
1017 #endif
1018
1019                         base.Emit ();
1020                 }
1021
1022                 public override string GetSignatureForError ()
1023                 {
1024                         return MemberName.GetSignatureForError ();
1025                 }
1026
1027                 public bool CheckAccessLevel (Type check_type)
1028                 {
1029                         TypeBuilder tb = TypeBuilder;
1030 #if GMCS_SOURCE
1031                         if (this is GenericMethod) {
1032                                 tb = Parent.TypeBuilder;
1033
1034                                 // FIXME: Generic container does not work with nested generic
1035                                 // anonymous method stories
1036                                 if (TypeBuilder == null)
1037                                         return true;
1038                         }
1039 #endif
1040
1041                         check_type = TypeManager.DropGenericTypeArguments (check_type);
1042                         if (check_type == tb)
1043                                 return true;
1044
1045                         //
1046                         // Broken Microsoft runtime, return public for arrays, no matter what
1047                         // the accessibility is for their underlying class, and they return
1048                         // NonPublic visibility for pointers
1049                         //
1050                         if (check_type.IsArray || check_type.IsPointer)
1051                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
1052
1053                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
1054
1055                         switch (check_attr){
1056                         case TypeAttributes.Public:
1057                                 return true;
1058
1059                         case TypeAttributes.NotPublic:
1060                                 return TypeManager.IsThisOrFriendAssembly (check_type.Assembly);
1061
1062                         case TypeAttributes.NestedPublic:
1063                                 return CheckAccessLevel (check_type.DeclaringType);
1064
1065                         case TypeAttributes.NestedPrivate:
1066                                 Type declaring = check_type.DeclaringType;
1067                                 return tb == declaring || TypeManager.IsNestedChildOf (tb, declaring);
1068
1069                         case TypeAttributes.NestedFamily:
1070                                 //
1071                                 // Only accessible to methods in current type or any subtypes
1072                                 //
1073                                 return FamilyAccessible (tb, check_type);
1074
1075                         case TypeAttributes.NestedFamANDAssem:
1076                                 return TypeManager.IsThisOrFriendAssembly (check_type.Assembly) &&
1077                                         FamilyAccessible (tb, check_type);
1078
1079                         case TypeAttributes.NestedFamORAssem:
1080                                 return FamilyAccessible (tb, check_type) ||
1081                                         TypeManager.IsThisOrFriendAssembly (check_type.Assembly);
1082
1083                         case TypeAttributes.NestedAssembly:
1084                                 return TypeManager.IsThisOrFriendAssembly (check_type.Assembly);
1085                         }
1086
1087                         throw new NotImplementedException (check_attr.ToString ());
1088                 }
1089
1090                 static bool FamilyAccessible (Type tb, Type check_type)
1091                 {
1092                         Type declaring = check_type.DeclaringType;
1093                         return TypeManager.IsNestedFamilyAccessible (tb, declaring);
1094                 }
1095
1096                 public bool IsBaseType (Type baseType)
1097                 {
1098                         if (TypeManager.IsInterfaceType (baseType))
1099                                 throw new NotImplementedException ();
1100
1101                         Type type = TypeBuilder;
1102                         while (type != null) {
1103                                 if (TypeManager.IsEqual (type, baseType))
1104                                         return true;
1105
1106                                 type = type.BaseType;
1107                         }
1108
1109                         return false;
1110                 }
1111
1112                 private Type LookupNestedTypeInHierarchy (string name)
1113                 {
1114                         Type t = null;
1115                         // if the member cache has been created, lets use it.
1116                         // the member cache is MUCH faster.
1117                         if (MemberCache != null) {
1118                                 t = MemberCache.FindNestedType (name);
1119                                 if (t == null)
1120                                         return null;
1121
1122                         //
1123                         // FIXME: This hack is needed because member cache does not work
1124                         // with nested base generic types, it does only type name copy and
1125                         // not type construction
1126                         //
1127 #if !GMCS_SOURCE
1128                                 return t;
1129 #endif
1130                         }
1131
1132                         // no member cache. Do it the hard way -- reflection
1133                         for (Type current_type = TypeBuilder;
1134                              current_type != null && current_type != TypeManager.object_type;
1135                              current_type = current_type.BaseType) {
1136
1137                                 Type ct = TypeManager.DropGenericTypeArguments (current_type);
1138                                 if (ct is TypeBuilder) {
1139                                         TypeContainer tc = ct == TypeBuilder
1140                                                 ? PartialContainer : TypeManager.LookupTypeContainer (ct);
1141                                         if (tc != null)
1142                                                 t = tc.FindNestedType (name);
1143                                 } else {
1144                                         t = TypeManager.GetNestedType (ct, name);
1145                                 }
1146
1147                                 if ((t == null) || !CheckAccessLevel (t))
1148                                         continue;
1149
1150 #if GMCS_SOURCE
1151                                 if (!TypeManager.IsGenericType (current_type))
1152                                         return t;
1153
1154                                 Type[] args = TypeManager.GetTypeArguments (current_type);
1155                                 Type[] targs = TypeManager.GetTypeArguments (t);
1156                                 for (int i = 0; i < args.Length; i++)
1157                                         targs [i] = args [i];
1158
1159                                 t = t.MakeGenericType (targs);
1160 #endif
1161
1162                                 return t;
1163                         }
1164
1165                         return null;
1166                 }
1167
1168                 public virtual ExtensionMethodGroupExpr LookupExtensionMethod (Type extensionType, string name, Location loc)
1169                 {
1170                         return null;
1171                 }
1172
1173                 //
1174                 // Public function used to locate types.
1175                 //
1176                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
1177                 //
1178                 // Returns: Type or null if they type can not be found.
1179                 //
1180                 public FullNamedExpression LookupNamespaceOrType (string name, Location loc, bool ignore_cs0104)
1181                 {
1182                         if (Cache.Contains (name))
1183                                 return (FullNamedExpression) Cache [name];
1184
1185                         FullNamedExpression e;
1186                         int errors = Report.Errors;
1187                         Type t = LookupNestedTypeInHierarchy (name);
1188                         if (t != null)
1189                                 e = new TypeExpression (t, Location.Null);
1190                         else if (Parent != null)
1191                                 e = Parent.LookupNamespaceOrType (name, loc, ignore_cs0104);
1192                         else
1193                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
1194
1195                         if (errors == Report.Errors)
1196                                 Cache [name] = e;
1197
1198                         return e;
1199                 }
1200
1201                 /// <remarks>
1202                 ///   This function is broken and not what you're looking for.  It should only
1203                 ///   be used while the type is still being created since it doesn't use the cache
1204                 ///   and relies on the filter doing the member name check.
1205                 /// </remarks>
1206                 ///
1207                 // [Obsolete ("Only MemberCache approach should be used")]
1208                 public virtual MemberList FindMembers (MemberTypes mt, BindingFlags bf,
1209                                                         MemberFilter filter, object criteria)
1210                 {
1211                         throw new NotSupportedException ();
1212                 }
1213
1214                 /// <remarks>
1215                 ///   If we have a MemberCache, return it.  This property may return null if the
1216                 ///   class doesn't have a member cache or while it's still being created.
1217                 /// </remarks>
1218                 public abstract MemberCache MemberCache {
1219                         get;
1220                 }
1221
1222                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
1223                 {
1224                         if (a.Type == TypeManager.required_attr_type) {
1225                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
1226                                 return;
1227                         }
1228                         TypeBuilder.SetCustomAttribute (cb);
1229                 }
1230
1231                 //
1232                 // Extensions for generics
1233                 //
1234                 protected TypeParameter[] type_params;
1235                 TypeParameter[] type_param_list;
1236
1237                 TypeParameter[] initialize_type_params ()
1238                 {
1239                         if (type_param_list != null)
1240                                 return type_param_list;
1241
1242                         DeclSpace the_parent = Parent;
1243                         if (this is GenericMethod)
1244                                 the_parent = null;
1245
1246                         ArrayList list = new ArrayList ();
1247                         if (the_parent != null && the_parent.IsGeneric) {
1248                                 // FIXME: move generics info out of DeclSpace
1249                                 TypeParameter[] parent_params = the_parent.PartialContainer.TypeParameters;
1250                                 list.AddRange (parent_params);
1251                         }
1252
1253                         int count = type_params != null ? type_params.Length : 0;
1254                         for (int i = 0; i < count; i++) {
1255                                 TypeParameter param = type_params [i];
1256                                 list.Add (param);
1257                                 if (Parent.IsGeneric) {
1258                                         foreach (TypeParameter tp in Parent.PartialContainer.CurrentTypeParameters) {
1259                                                 if (tp.Name != param.Name)
1260                                                         continue;
1261
1262                                                 Report.SymbolRelatedToPreviousError (tp.Location, null);
1263                                                 Report.Warning (693, 3, param.Location,
1264                                                         "Type parameter `{0}' has the same name as the type parameter from outer type `{1}'",
1265                                                         param.Name, Parent.GetSignatureForError ());
1266                                         }
1267                                 }
1268                         }
1269
1270                         type_param_list = new TypeParameter [list.Count];
1271                         list.CopyTo (type_param_list, 0);
1272                         return type_param_list;
1273                 }
1274
1275                 public virtual void SetParameterInfo (ArrayList constraints_list)
1276                 {
1277                         if (!is_generic) {
1278                                 if (constraints_list != null) {
1279                                         Report.Error (
1280                                                 80, Location, "Constraints are not allowed " +
1281                                                 "on non-generic declarations");
1282                                 }
1283
1284                                 return;
1285                         }
1286
1287                         TypeParameterName[] names = MemberName.TypeArguments.GetDeclarations ();
1288                         type_params = new TypeParameter [names.Length];
1289
1290                         //
1291                         // Register all the names
1292                         //
1293                         for (int i = 0; i < type_params.Length; i++) {
1294                                 TypeParameterName name = names [i];
1295
1296                                 Constraints constraints = null;
1297                                 if (constraints_list != null) {
1298                                         int total = constraints_list.Count;
1299                                         for (int ii = 0; ii < total; ++ii) {
1300                                                 Constraints constraints_at = (Constraints)constraints_list[ii];
1301                                                 // TODO: it is used by iterators only
1302                                                 if (constraints_at == null) {
1303                                                         constraints_list.RemoveAt (ii);
1304                                                         --total;
1305                                                         continue;
1306                                                 }
1307                                                 if (constraints_at.TypeParameter == name.Name) {
1308                                                         constraints = constraints_at;
1309                                                         constraints_list.RemoveAt(ii);
1310                                                         break;
1311                                                 }
1312                                         }
1313                                 }
1314
1315                                 type_params [i] = new TypeParameter (
1316                                         Parent, this, name.Name, constraints, name.OptAttributes,
1317                                         Location);
1318
1319                                 AddToContainer (type_params [i], name.Name);
1320                         }
1321
1322                         if (constraints_list != null && constraints_list.Count > 0) {
1323                                 foreach (Constraints constraint in constraints_list) {
1324                                         Report.Error(699, constraint.Location, "`{0}': A constraint references nonexistent type parameter `{1}'",
1325                                                 GetSignatureForError (), constraint.TypeParameter);
1326                                 }
1327                         }
1328                 }
1329
1330                 public TypeParameter[] TypeParameters {
1331                         get {
1332                                 if (!IsGeneric)
1333                                         throw new InvalidOperationException ();
1334                                 if ((PartialContainer != null) && (PartialContainer != this))
1335                                         return PartialContainer.TypeParameters;
1336                                 if (type_param_list == null)
1337                                         initialize_type_params ();
1338
1339                                 return type_param_list;
1340                         }
1341                 }
1342
1343                 public TypeParameter[] CurrentTypeParameters {
1344                         get {
1345                                 if (!IsGeneric)
1346                                         throw new InvalidOperationException ();
1347
1348                                 // TODO: Something is seriously broken here
1349                                 if (type_params == null)
1350                                         return new TypeParameter [0];
1351
1352                                 return type_params;
1353                         }
1354                 }
1355
1356                 public int CountTypeParameters {
1357                         get {
1358                                 return count_type_params;
1359                         }
1360                 }
1361
1362                 public TypeParameterExpr LookupGeneric (string name, Location loc)
1363                 {
1364                         if (!IsGeneric)
1365                                 return null;
1366
1367                         TypeParameter [] current_params;
1368                         if (this is TypeContainer)
1369                                 current_params = PartialContainer.CurrentTypeParameters;
1370                         else
1371                                 current_params = CurrentTypeParameters;
1372
1373                         foreach (TypeParameter type_param in current_params) {
1374                                 if (type_param.Name == name)
1375                                         return new TypeParameterExpr (type_param, loc);
1376                         }
1377
1378                         if (Parent != null)
1379                                 return Parent.LookupGeneric (name, loc);
1380
1381                         return null;
1382                 }
1383
1384                 // Used for error reporting only
1385                 public virtual Type LookupAnyGeneric (string typeName)
1386                 {
1387                         return NamespaceEntry.NS.LookForAnyGenericType (typeName);
1388                 }
1389
1390                 public override string[] ValidAttributeTargets {
1391                         get { return attribute_targets; }
1392                 }
1393
1394                 protected override bool VerifyClsCompliance ()
1395                 {
1396                         if (!base.VerifyClsCompliance ()) {
1397                                 return false;
1398                         }
1399
1400                         if (type_params != null) {
1401                                 foreach (TypeParameter tp in type_params) {
1402                                         if (tp.Constraints == null)
1403                                                 continue;
1404
1405                                         tp.Constraints.VerifyClsCompliance ();
1406                                 }
1407                         }
1408
1409                         IDictionary cache = TypeManager.AllClsTopLevelTypes;
1410                         if (cache == null)
1411                                 return true;
1412
1413                         string lcase = Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1414                         if (!cache.Contains (lcase)) {
1415                                 cache.Add (lcase, this);
1416                                 return true;
1417                         }
1418
1419                         object val = cache [lcase];
1420                         if (val == null) {
1421                                 Type t = AttributeTester.GetImportedIgnoreCaseClsType (lcase);
1422                                 if (t == null)
1423                                         return true;
1424                                 Report.SymbolRelatedToPreviousError (t);
1425                         }
1426                         else {
1427                                 Report.SymbolRelatedToPreviousError ((DeclSpace)val);
1428                         }
1429
1430                         Report.Warning (3005, 1, Location, "Identifier `{0}' differing only in case is not CLS-compliant", GetSignatureForError ());
1431                         return true;
1432                 }
1433         }
1434
1435         /// <summary>
1436         ///   This is a readonly list of MemberInfo's.
1437         /// </summary>
1438         public class MemberList : IList {
1439                 public readonly IList List;
1440                 int count;
1441
1442                 /// <summary>
1443                 ///   Create a new MemberList from the given IList.
1444                 /// </summary>
1445                 public MemberList (IList list)
1446                 {
1447                         if (list != null)
1448                                 this.List = list;
1449                         else
1450                                 this.List = new ArrayList ();
1451                         count = List.Count;
1452                 }
1453
1454                 /// <summary>
1455                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1456                 /// </summary>
1457                 public MemberList (IList first, IList second)
1458                 {
1459                         ArrayList list = new ArrayList ();
1460                         list.AddRange (first);
1461                         list.AddRange (second);
1462                         count = list.Count;
1463                         List = list;
1464                 }
1465
1466                 public static readonly MemberList Empty = new MemberList (new ArrayList (0));
1467
1468                 /// <summary>
1469                 ///   Cast the MemberList into a MemberInfo[] array.
1470                 /// </summary>
1471                 /// <remarks>
1472                 ///   This is an expensive operation, only use it if it's really necessary.
1473                 /// </remarks>
1474                 public static explicit operator MemberInfo [] (MemberList list)
1475                 {
1476                         Timer.StartTimer (TimerType.MiscTimer);
1477                         MemberInfo [] result = new MemberInfo [list.Count];
1478                         list.CopyTo (result, 0);
1479                         Timer.StopTimer (TimerType.MiscTimer);
1480                         return result;
1481                 }
1482
1483                 // ICollection
1484
1485                 public int Count {
1486                         get {
1487                                 return count;
1488                         }
1489                 }
1490
1491                 public bool IsSynchronized {
1492                         get {
1493                                 return List.IsSynchronized;
1494                         }
1495                 }
1496
1497                 public object SyncRoot {
1498                         get {
1499                                 return List.SyncRoot;
1500                         }
1501                 }
1502
1503                 public void CopyTo (Array array, int index)
1504                 {
1505                         List.CopyTo (array, index);
1506                 }
1507
1508                 // IEnumerable
1509
1510                 public IEnumerator GetEnumerator ()
1511                 {
1512                         return List.GetEnumerator ();
1513                 }
1514
1515                 // IList
1516
1517                 public bool IsFixedSize {
1518                         get {
1519                                 return true;
1520                         }
1521                 }
1522
1523                 public bool IsReadOnly {
1524                         get {
1525                                 return true;
1526                         }
1527                 }
1528
1529                 object IList.this [int index] {
1530                         get {
1531                                 return List [index];
1532                         }
1533
1534                         set {
1535                                 throw new NotSupportedException ();
1536                         }
1537                 }
1538
1539                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1540                 public MemberInfo this [int index] {
1541                         get {
1542                                 return (MemberInfo) List [index];
1543                         }
1544                 }
1545
1546                 public int Add (object value)
1547                 {
1548                         throw new NotSupportedException ();
1549                 }
1550
1551                 public void Clear ()
1552                 {
1553                         throw new NotSupportedException ();
1554                 }
1555
1556                 public bool Contains (object value)
1557                 {
1558                         return List.Contains (value);
1559                 }
1560
1561                 public int IndexOf (object value)
1562                 {
1563                         return List.IndexOf (value);
1564                 }
1565
1566                 public void Insert (int index, object value)
1567                 {
1568                         throw new NotSupportedException ();
1569                 }
1570
1571                 public void Remove (object value)
1572                 {
1573                         throw new NotSupportedException ();
1574                 }
1575
1576                 public void RemoveAt (int index)
1577                 {
1578                         throw new NotSupportedException ();
1579                 }
1580         }
1581
1582         /// <summary>
1583         ///   This interface is used to get all members of a class when creating the
1584         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1585         ///   want to support the member cache and by TypeHandle to get caching of
1586         ///   non-dynamic types.
1587         /// </summary>
1588         public interface IMemberContainer {
1589                 /// <summary>
1590                 ///   The name of the IMemberContainer.  This is only used for
1591                 ///   debugging purposes.
1592                 /// </summary>
1593                 string Name {
1594                         get;
1595                 }
1596
1597                 /// <summary>
1598                 ///   The type of this IMemberContainer.
1599                 /// </summary>
1600                 Type Type {
1601                         get;
1602                 }
1603
1604                 /// <summary>
1605                 ///   Returns the IMemberContainer of the base class or null if this
1606                 ///   is an interface or TypeManger.object_type.
1607                 ///   This is used when creating the member cache for a class to get all
1608                 ///   members from the base class.
1609                 /// </summary>
1610                 MemberCache BaseCache {
1611                         get;
1612                 }
1613
1614                 /// <summary>
1615                 ///   Whether this is an interface.
1616                 /// </summary>
1617                 bool IsInterface {
1618                         get;
1619                 }
1620
1621                 /// <summary>
1622                 ///   Returns all members of this class with the corresponding MemberTypes
1623                 ///   and BindingFlags.
1624                 /// </summary>
1625                 /// <remarks>
1626                 ///   When implementing this method, make sure not to return any inherited
1627                 ///   members and check the MemberTypes and BindingFlags properly.
1628                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1629                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1630                 ///   MemberInfo class, but the cache needs this information.  That's why
1631                 ///   this method is called multiple times with different BindingFlags.
1632                 /// </remarks>
1633                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1634         }
1635
1636         /// <summary>
1637         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1638         ///   member lookups.  It has a member name based hash table; it maps each member
1639         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1640         ///   and the BindingFlags that were initially used to get it.  The cache contains
1641         ///   all members of the current class and all inherited members.  If this cache is
1642         ///   for an interface types, it also contains all inherited members.
1643         ///
1644         ///   There are two ways to get a MemberCache:
1645         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1646         ///     use the DeclSpace.MemberCache property.
1647         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1648         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1649         /// </summary>
1650         public class MemberCache {
1651                 public readonly IMemberContainer Container;
1652                 protected Hashtable member_hash;
1653                 protected Hashtable method_hash;
1654
1655                 /// <summary>
1656                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1657                 /// </summary>
1658                 public MemberCache (IMemberContainer container)
1659                 {
1660                         this.Container = container;
1661
1662                         Timer.IncrementCounter (CounterType.MemberCache);
1663                         Timer.StartTimer (TimerType.CacheInit);
1664
1665                         // If we have a base class (we have a base class unless we're
1666                         // TypeManager.object_type), we deep-copy its MemberCache here.
1667                         if (Container.BaseCache != null)
1668                                 member_hash = SetupCache (Container.BaseCache);
1669                         else
1670                                 member_hash = new Hashtable ();
1671
1672                         // If this is neither a dynamic type nor an interface, create a special
1673                         // method cache with all declared and inherited methods.
1674                         Type type = container.Type;
1675                         if (!(type is TypeBuilder) && !type.IsInterface &&
1676                             // !(type.IsGenericType && (type.GetGenericTypeDefinition () is TypeBuilder)) &&
1677                             !TypeManager.IsGenericType (type) && !TypeManager.IsGenericParameter (type) &&
1678                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1679                                 method_hash = new Hashtable ();
1680                                 AddMethods (type);
1681                         }
1682
1683                         // Add all members from the current class.
1684                         AddMembers (Container);
1685
1686                         Timer.StopTimer (TimerType.CacheInit);
1687                 }
1688
1689                 public MemberCache (Type baseType, IMemberContainer container)
1690                 {
1691                         this.Container = container;
1692                         if (baseType == null)
1693                                 this.member_hash = new Hashtable ();
1694                         else
1695                                 this.member_hash = SetupCache (TypeManager.LookupMemberCache (baseType));
1696                 }
1697
1698                 public MemberCache (Type[] ifaces)
1699                 {
1700                         //
1701                         // The members of this cache all belong to other caches.
1702                         // So, 'Container' will not be used.
1703                         //
1704                         this.Container = null;
1705
1706                         member_hash = new Hashtable ();
1707                         if (ifaces == null)
1708                                 return;
1709
1710                         foreach (Type itype in ifaces)
1711                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1712                 }
1713
1714                 public MemberCache (IMemberContainer container, Type base_class, Type[] ifaces)
1715                 {
1716                         this.Container = container;
1717
1718                         // If we have a base class (we have a base class unless we're
1719                         // TypeManager.object_type), we deep-copy its MemberCache here.
1720                         if (Container.BaseCache != null)
1721                                 member_hash = SetupCache (Container.BaseCache);
1722                         else
1723                                 member_hash = new Hashtable ();
1724
1725                         if (base_class != null)
1726                                 AddCacheContents (TypeManager.LookupMemberCache (base_class));
1727                         if (ifaces != null) {
1728                                 foreach (Type itype in ifaces) {
1729                                         MemberCache cache = TypeManager.LookupMemberCache (itype);
1730                                         if (cache != null)
1731                                                 AddCacheContents (cache);
1732                                 }
1733                         }
1734                 }
1735
1736                 /// <summary>
1737                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1738                 /// </summary>
1739                 static Hashtable SetupCache (MemberCache base_class)
1740                 {
1741                         if (base_class == null)
1742                                 return new Hashtable ();
1743
1744                         Hashtable hash = new Hashtable (base_class.member_hash.Count);
1745                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1746                         while (it.MoveNext ()) {
1747                                 hash.Add (it.Key, ((ArrayList) it.Value).Clone ());
1748                          }
1749
1750                         return hash;
1751                 }
1752
1753                 //
1754                 // Converts ModFlags to BindingFlags
1755                 //
1756                 static BindingFlags GetBindingFlags (int modifiers)
1757                 {
1758                         BindingFlags bf;
1759                         if ((modifiers & Modifiers.STATIC) != 0)
1760                                 bf = BindingFlags.Static;
1761                         else
1762                                 bf = BindingFlags.Instance;
1763
1764                         if ((modifiers & Modifiers.PRIVATE) != 0)
1765                                 bf |= BindingFlags.NonPublic;
1766                         else
1767                                 bf |= BindingFlags.Public;
1768
1769                         return bf;
1770                 }
1771
1772                 /// <summary>
1773                 ///   Add the contents of `cache' to the member_hash.
1774                 /// </summary>
1775                 void AddCacheContents (MemberCache cache)
1776                 {
1777                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1778                         while (it.MoveNext ()) {
1779                                 ArrayList list = (ArrayList) member_hash [it.Key];
1780                                 if (list == null)
1781                                         member_hash [it.Key] = list = new ArrayList ();
1782
1783                                 ArrayList entries = (ArrayList) it.Value;
1784                                 for (int i = entries.Count-1; i >= 0; i--) {
1785                                         CacheEntry entry = (CacheEntry) entries [i];
1786
1787                                         if (entry.Container != cache.Container)
1788                                                 break;
1789                                         list.Add (entry);
1790                                 }
1791                         }
1792                 }
1793
1794                 /// <summary>
1795                 ///   Add all members from class `container' to the cache.
1796                 /// </summary>
1797                 void AddMembers (IMemberContainer container)
1798                 {
1799                         // We need to call AddMembers() with a single member type at a time
1800                         // to get the member type part of CacheEntry.EntryType right.
1801                         if (!container.IsInterface) {
1802                                 AddMembers (MemberTypes.Constructor, container);
1803                                 AddMembers (MemberTypes.Field, container);
1804                         }
1805                         AddMembers (MemberTypes.Method, container);
1806                         AddMembers (MemberTypes.Property, container);
1807                         AddMembers (MemberTypes.Event, container);
1808                         // Nested types are returned by both Static and Instance searches.
1809                         AddMembers (MemberTypes.NestedType,
1810                                     BindingFlags.Static | BindingFlags.Public, container);
1811                         AddMembers (MemberTypes.NestedType,
1812                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1813                 }
1814
1815                 void AddMembers (MemberTypes mt, IMemberContainer container)
1816                 {
1817                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1818                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1819                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1820                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1821                 }
1822
1823                 public void AddMember (MemberInfo mi, MemberCore mc)
1824                 {
1825                         AddMember (mi.MemberType, GetBindingFlags (mc.ModFlags), Container, mi.Name, mi);
1826                 }
1827
1828                 public void AddGenericMember (MemberInfo mi, InterfaceMemberBase mc)
1829                 {
1830                         AddMember (mi.MemberType, GetBindingFlags (mc.ModFlags), Container,
1831                                 MemberName.MakeName (mc.GetFullName (mc.MemberName), mc.MemberName.TypeArguments), mi);
1832                 }
1833
1834                 public void AddNestedType (DeclSpace type)
1835                 {
1836                         AddMember (MemberTypes.NestedType, GetBindingFlags (type.ModFlags), (IMemberContainer) type.Parent,
1837                                 type.TypeBuilder.Name, type.TypeBuilder);
1838                 }
1839
1840                 public void AddInterface (MemberCache baseCache)
1841                 {
1842                         if (baseCache.member_hash.Count > 0)
1843                                 AddCacheContents (baseCache);
1844                 }
1845
1846                 void AddMember (MemberTypes mt, BindingFlags bf, IMemberContainer container,
1847                                 string name, MemberInfo member)
1848                 {
1849                         // We use a name-based hash table of ArrayList's.
1850                         ArrayList list = (ArrayList) member_hash [name];
1851                         if (list == null) {
1852                                 list = new ArrayList (1);
1853                                 member_hash.Add (name, list);
1854                         }
1855
1856                         // When this method is called for the current class, the list will
1857                         // already contain all inherited members from our base classes.
1858                         // We cannot add new members in front of the list since this'd be an
1859                         // expensive operation, that's why the list is sorted in reverse order
1860                         // (ie. members from the current class are coming last).
1861                         list.Add (new CacheEntry (container, member, mt, bf));
1862                 }
1863
1864                 /// <summary>
1865                 ///   Add all members from class `container' with the requested MemberTypes and
1866                 ///   BindingFlags to the cache.  This method is called multiple times with different
1867                 ///   MemberTypes and BindingFlags.
1868                 /// </summary>
1869                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1870                 {
1871                         MemberList members = container.GetMembers (mt, bf);
1872
1873                         foreach (MemberInfo member in members) {
1874                                 string name = member.Name;
1875
1876                                 AddMember (mt, bf, container, name, member);
1877
1878                                 if (member is MethodInfo) {
1879                                         string gname = TypeManager.GetMethodName ((MethodInfo) member);
1880                                         if (gname != name)
1881                                                 AddMember (mt, bf, container, gname, member);
1882                                 }
1883                         }
1884                 }
1885
1886                 /// <summary>
1887                 ///   Add all declared and inherited methods from class `type' to the method cache.
1888                 /// </summary>
1889                 void AddMethods (Type type)
1890                 {
1891                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1892                                     BindingFlags.FlattenHierarchy, type);
1893                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1894                                     BindingFlags.FlattenHierarchy, type);
1895                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1896                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1897                 }
1898
1899                 static ArrayList overrides = new ArrayList ();
1900
1901                 void AddMethods (BindingFlags bf, Type type)
1902                 {
1903                         MethodBase [] members = type.GetMethods (bf);
1904
1905                         Array.Reverse (members);
1906
1907                         foreach (MethodBase member in members) {
1908                                 string name = member.Name;
1909
1910                                 // We use a name-based hash table of ArrayList's.
1911                                 ArrayList list = (ArrayList) method_hash [name];
1912                                 if (list == null) {
1913                                         list = new ArrayList (1);
1914                                         method_hash.Add (name, list);
1915                                 }
1916
1917                                 MethodInfo curr = (MethodInfo) member;
1918                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1919                                         MethodInfo base_method = curr.GetBaseDefinition ();
1920
1921                                         if (base_method == curr)
1922                                                 // Not every virtual function needs to have a NewSlot flag.
1923                                                 break;
1924
1925                                         overrides.Add (curr);
1926                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1927                                         curr = base_method;
1928                                 }
1929
1930                                 if (overrides.Count > 0) {
1931                                         for (int i = 0; i < overrides.Count; ++i)
1932                                                 TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
1933                                         overrides.Clear ();
1934                                 }
1935
1936                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1937                                 // sorted so we need to do this check for every member.
1938                                 BindingFlags new_bf = bf;
1939                                 if (member.DeclaringType == type)
1940                                         new_bf |= BindingFlags.DeclaredOnly;
1941
1942                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1943                         }
1944                 }
1945
1946                 /// <summary>
1947                 ///   Compute and return a appropriate `EntryType' magic number for the given
1948                 ///   MemberTypes and BindingFlags.
1949                 /// </summary>
1950                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1951                 {
1952                         EntryType type = EntryType.None;
1953
1954                         if ((mt & MemberTypes.Constructor) != 0)
1955                                 type |= EntryType.Constructor;
1956                         if ((mt & MemberTypes.Event) != 0)
1957                                 type |= EntryType.Event;
1958                         if ((mt & MemberTypes.Field) != 0)
1959                                 type |= EntryType.Field;
1960                         if ((mt & MemberTypes.Method) != 0)
1961                                 type |= EntryType.Method;
1962                         if ((mt & MemberTypes.Property) != 0)
1963                                 type |= EntryType.Property;
1964                         // Nested types are returned by static and instance searches.
1965                         if ((mt & MemberTypes.NestedType) != 0)
1966                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1967
1968                         if ((bf & BindingFlags.Instance) != 0)
1969                                 type |= EntryType.Instance;
1970                         if ((bf & BindingFlags.Static) != 0)
1971                                 type |= EntryType.Static;
1972                         if ((bf & BindingFlags.Public) != 0)
1973                                 type |= EntryType.Public;
1974                         if ((bf & BindingFlags.NonPublic) != 0)
1975                                 type |= EntryType.NonPublic;
1976                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1977                                 type |= EntryType.Declared;
1978
1979                         return type;
1980                 }
1981
1982                 /// <summary>
1983                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1984                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1985                 ///   single member types.
1986                 /// </summary>
1987                 public static bool IsSingleMemberType (MemberTypes mt)
1988                 {
1989                         switch (mt) {
1990                         case MemberTypes.Constructor:
1991                         case MemberTypes.Event:
1992                         case MemberTypes.Field:
1993                         case MemberTypes.Method:
1994                         case MemberTypes.Property:
1995                         case MemberTypes.NestedType:
1996                                 return true;
1997
1998                         default:
1999                                 return false;
2000                         }
2001                 }
2002
2003                 /// <summary>
2004                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
2005                 ///   number to speed up the searching process.
2006                 /// </summary>
2007                 [Flags]
2008                 protected enum EntryType {
2009                         None            = 0x000,
2010
2011                         Instance        = 0x001,
2012                         Static          = 0x002,
2013                         MaskStatic      = Instance|Static,
2014
2015                         Public          = 0x004,
2016                         NonPublic       = 0x008,
2017                         MaskProtection  = Public|NonPublic,
2018
2019                         Declared        = 0x010,
2020
2021                         Constructor     = 0x020,
2022                         Event           = 0x040,
2023                         Field           = 0x080,
2024                         Method          = 0x100,
2025                         Property        = 0x200,
2026                         NestedType      = 0x400,
2027
2028                         NotExtensionMethod      = 0x800,
2029
2030                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
2031                 }
2032
2033                 protected class CacheEntry {
2034                         public readonly IMemberContainer Container;
2035                         public EntryType EntryType;
2036                         public readonly MemberInfo Member;
2037
2038                         public CacheEntry (IMemberContainer container, MemberInfo member,
2039                                            MemberTypes mt, BindingFlags bf)
2040                         {
2041                                 this.Container = container;
2042                                 this.Member = member;
2043                                 this.EntryType = GetEntryType (mt, bf);
2044                         }
2045
2046                         public override string ToString ()
2047                         {
2048                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
2049                                                       EntryType, Member);
2050                         }
2051                 }
2052
2053                 /// <summary>
2054                 ///   This is called each time we're walking up one level in the class hierarchy
2055                 ///   and checks whether we can abort the search since we've already found what
2056                 ///   we were looking for.
2057                 /// </summary>
2058                 protected bool DoneSearching (ArrayList list)
2059                 {
2060                         //
2061                         // We've found exactly one member in the current class and it's not
2062                         // a method or constructor.
2063                         //
2064                         if (list.Count == 1 && !(list [0] is MethodBase))
2065                                 return true;
2066
2067                         //
2068                         // Multiple properties: we query those just to find out the indexer
2069                         // name
2070                         //
2071                         if ((list.Count > 0) && (list [0] is PropertyInfo))
2072                                 return true;
2073
2074                         return false;
2075                 }
2076
2077                 /// <summary>
2078                 ///   Looks up members with name `name'.  If you provide an optional
2079                 ///   filter function, it'll only be called with members matching the
2080                 ///   requested member name.
2081                 ///
2082                 ///   This method will try to use the cache to do the lookup if possible.
2083                 ///
2084                 ///   Unlike other FindMembers implementations, this method will always
2085                 ///   check all inherited members - even when called on an interface type.
2086                 ///
2087                 ///   If you know that you're only looking for methods, you should use
2088                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
2089                 ///   When doing a method-only search, it'll try to use a special method
2090                 ///   cache (unless it's a dynamic type or an interface) and the returned
2091                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
2092                 ///   The lookup process will automatically restart itself in method-only
2093                 ///   search mode if it discovers that it's about to return methods.
2094                 /// </summary>
2095                 ArrayList global = new ArrayList ();
2096                 bool using_global = false;
2097
2098                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
2099
2100                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
2101                                                   MemberFilter filter, object criteria)
2102                 {
2103                         if (using_global)
2104                                 throw new Exception ();
2105
2106                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
2107                         bool method_search = mt == MemberTypes.Method;
2108                         // If we have a method cache and we aren't already doing a method-only search,
2109                         // then we restart a method search if the first match is a method.
2110                         bool do_method_search = !method_search && (method_hash != null);
2111
2112                         ArrayList applicable;
2113
2114                         // If this is a method-only search, we try to use the method cache if
2115                         // possible; a lookup in the method cache will return a MemberInfo with
2116                         // the correct ReflectedType for inherited methods.
2117
2118                         if (method_search && (method_hash != null))
2119                                 applicable = (ArrayList) method_hash [name];
2120                         else
2121                                 applicable = (ArrayList) member_hash [name];
2122
2123                         if (applicable == null)
2124                                 return emptyMemberInfo;
2125
2126                         //
2127                         // 32  slots gives 53 rss/54 size
2128                         // 2/4 slots gives 55 rss
2129                         //
2130                         // Strange: from 25,000 calls, only 1,800
2131                         // are above 2.  Why does this impact it?
2132                         //
2133                         global.Clear ();
2134                         using_global = true;
2135
2136                         Timer.StartTimer (TimerType.CachedLookup);
2137
2138                         EntryType type = GetEntryType (mt, bf);
2139
2140                         IMemberContainer current = Container;
2141
2142                         bool do_interface_search = current.IsInterface;
2143
2144                         // `applicable' is a list of all members with the given member name `name'
2145                         // in the current class and all its base classes.  The list is sorted in
2146                         // reverse order due to the way how the cache is initialy created (to speed
2147                         // things up, we're doing a deep-copy of our base).
2148
2149                         for (int i = applicable.Count-1; i >= 0; i--) {
2150                                 CacheEntry entry = (CacheEntry) applicable [i];
2151
2152                                 // This happens each time we're walking one level up in the class
2153                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
2154                                 // the first time this happens (this may already happen in the first
2155                                 // iteration of this loop if there are no members with the name we're
2156                                 // looking for in the current class).
2157                                 if (entry.Container != current) {
2158                                         if (declared_only)
2159                                                 break;
2160
2161                                         if (!do_interface_search && DoneSearching (global))
2162                                                 break;
2163
2164                                         current = entry.Container;
2165                                 }
2166
2167                                 // Is the member of the correct type ?
2168                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
2169                                         continue;
2170
2171                                 // Is the member static/non-static ?
2172                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
2173                                         continue;
2174
2175                                 // Apply the filter to it.
2176                                 if (filter (entry.Member, criteria)) {
2177                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method) {
2178                                                 do_method_search = false;
2179                                         }
2180
2181                                         // Because interfaces support multiple inheritance we have to be sure that
2182                                         // base member is from same interface, so only top level member will be returned
2183                                         if (do_interface_search && global.Count > 0) {
2184                                                 bool member_already_exists = false;
2185
2186                                                 foreach (MemberInfo mi in global) {
2187                                                         if (mi is MethodBase)
2188                                                                 continue;
2189
2190                                                         if (IsInterfaceBaseInterface (TypeManager.GetInterfaces (mi.DeclaringType), entry.Member.DeclaringType)) {
2191                                                                 member_already_exists = true;
2192                                                                 break;
2193                                                         }
2194                                                 }
2195                                                 if (member_already_exists)
2196                                                         continue;
2197                                         }
2198
2199                                         global.Add (entry.Member);
2200                                 }
2201                         }
2202
2203                         Timer.StopTimer (TimerType.CachedLookup);
2204
2205                         // If we have a method cache and we aren't already doing a method-only
2206                         // search, we restart in method-only search mode if the first match is
2207                         // a method.  This ensures that we return a MemberInfo with the correct
2208                         // ReflectedType for inherited methods.
2209                         if (do_method_search && (global.Count > 0)){
2210                                 using_global = false;
2211
2212                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
2213                         }
2214
2215                         using_global = false;
2216                         MemberInfo [] copy = new MemberInfo [global.Count];
2217                         global.CopyTo (copy);
2218                         return copy;
2219                 }
2220
2221                 /// <summary>
2222                 /// Returns true if iterface exists in any base interfaces (ifaces)
2223                 /// </summary>
2224                 static bool IsInterfaceBaseInterface (Type[] ifaces, Type ifaceToFind)
2225                 {
2226                         foreach (Type iface in ifaces) {
2227                                 if (iface == ifaceToFind)
2228                                         return true;
2229
2230                                 Type[] base_ifaces = TypeManager.GetInterfaces (iface);
2231                                 if (base_ifaces.Length > 0 && IsInterfaceBaseInterface (base_ifaces, ifaceToFind))
2232                                         return true;
2233                         }
2234                         return false;
2235                 }
2236
2237                 // find the nested type @name in @this.
2238                 public Type FindNestedType (string name)
2239                 {
2240                         ArrayList applicable = (ArrayList) member_hash [name];
2241                         if (applicable == null)
2242                                 return null;
2243
2244                         for (int i = applicable.Count-1; i >= 0; i--) {
2245                                 CacheEntry entry = (CacheEntry) applicable [i];
2246                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
2247                                         return (Type) entry.Member;
2248                         }
2249
2250                         return null;
2251                 }
2252
2253                 public MemberInfo FindBaseEvent (Type invocation_type, string name)
2254                 {
2255                         ArrayList applicable = (ArrayList) member_hash [name];
2256                         if (applicable == null)
2257                                 return null;
2258
2259                         //
2260                         // Walk the chain of events, starting from the top.
2261                         //
2262                         for (int i = applicable.Count - 1; i >= 0; i--)
2263                         {
2264                                 CacheEntry entry = (CacheEntry) applicable [i];
2265                                 if ((entry.EntryType & EntryType.Event) == 0)
2266                                         continue;
2267
2268                                 EventInfo ei = (EventInfo)entry.Member;
2269                                 return ei.GetAddMethod (true);
2270                         }
2271
2272                         return null;
2273                 }
2274
2275                 //
2276                 // Looks for extension methods with defined name and extension type
2277                 //
2278                 public ArrayList FindExtensionMethods (Type extensionType, string name, bool publicOnly)
2279                 {
2280                         ArrayList entries;
2281                         if (method_hash != null)
2282                                 entries = (ArrayList)method_hash [name];
2283                         else
2284                                 entries = (ArrayList)member_hash [name];
2285
2286                         if (entries == null)
2287                                 return null;
2288
2289                         EntryType entry_type = EntryType.Static | EntryType.Method | EntryType.NotExtensionMethod;
2290                         if (publicOnly) {
2291                                 entry_type |= EntryType.Public;
2292                         }
2293                         EntryType found_entry_type = entry_type & ~EntryType.NotExtensionMethod;
2294
2295                         ArrayList candidates = null;
2296                         foreach (CacheEntry entry in entries) {
2297                                 if ((entry.EntryType & entry_type) == found_entry_type) {
2298                                         MethodBase mb = (MethodBase)entry.Member;
2299
2300                                         IMethodData md = TypeManager.GetMethod (mb);
2301                                         AParametersCollection pd = md == null ?
2302                                                 TypeManager.GetParameterData (mb) : md.ParameterInfo;
2303
2304                                         Type ex_type = pd.ExtensionMethodType;
2305                                         if (ex_type == null) {
2306                                                 entry.EntryType |= EntryType.NotExtensionMethod;
2307                                                 continue;
2308                                         }
2309
2310                                         //if (implicit conversion between ex_type and extensionType exist) {
2311                                                 if (candidates == null)
2312                                                         candidates = new ArrayList (2);
2313                                                 candidates.Add (mb);
2314                                         //}
2315                                 }
2316                         }
2317
2318                         return candidates;
2319                 }
2320
2321                 //
2322                 // This finds the method or property for us to override. invocation_type is the type where
2323                 // the override is going to be declared, name is the name of the method/property, and
2324                 // param_types is the parameters, if any to the method or property
2325                 //
2326                 // Because the MemberCache holds members from this class and all the base classes,
2327                 // we can avoid tons of reflection stuff.
2328                 //
2329                 public MemberInfo FindMemberToOverride (Type invocation_type, string name, AParametersCollection parameters, GenericMethod generic_method, bool is_property)
2330                 {
2331                         ArrayList applicable;
2332                         if (method_hash != null && !is_property)
2333                                 applicable = (ArrayList) method_hash [name];
2334                         else
2335                                 applicable = (ArrayList) member_hash [name];
2336
2337                         if (applicable == null)
2338                                 return null;
2339                         //
2340                         // Walk the chain of methods, starting from the top.
2341                         //
2342                         for (int i = applicable.Count - 1; i >= 0; i--) {
2343                                 CacheEntry entry = (CacheEntry) applicable [i];
2344
2345                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
2346                                         continue;
2347
2348                                 PropertyInfo pi = null;
2349                                 MethodInfo mi = null;
2350                                 FieldInfo fi = null;
2351                                 AParametersCollection cmp_attrs;
2352
2353                                 if (is_property) {
2354                                         if ((entry.EntryType & EntryType.Field) != 0) {
2355                                                 fi = (FieldInfo)entry.Member;
2356                                                 cmp_attrs = Parameters.EmptyReadOnlyParameters;
2357                                         } else {
2358                                                 pi = (PropertyInfo) entry.Member;
2359                                                 cmp_attrs = TypeManager.GetParameterData (pi);
2360                                         }
2361                                 } else {
2362                                         mi = (MethodInfo) entry.Member;
2363                                         cmp_attrs = TypeManager.GetParameterData (mi);
2364                                 }
2365
2366                                 if (fi != null) {
2367                                         // TODO: Almost duplicate !
2368                                         // Check visibility
2369                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
2370                                         case FieldAttributes.PrivateScope:
2371                                                 continue;
2372                                         case FieldAttributes.Private:
2373                                                 //
2374                                                 // A private method is Ok if we are a nested subtype.
2375                                                 // The spec actually is not very clear about this, see bug 52458.
2376                                                 //
2377                                                 if (!invocation_type.Equals (entry.Container.Type) &&
2378                                                     !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
2379                                                         continue;
2380                                                 break;
2381                                         case FieldAttributes.FamANDAssem:
2382                                         case FieldAttributes.Assembly:
2383                                                 //
2384                                                 // Check for assembly methods
2385                                                 //
2386                                                 if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
2387                                                         continue;
2388                                                 break;
2389                                         }
2390                                         return entry.Member;
2391                                 }
2392
2393                                 //
2394                                 // Check the arguments
2395                                 //
2396                                 if (cmp_attrs.Count != parameters.Count)
2397                                         continue;
2398
2399                                 int j;
2400                                 for (j = 0; j < cmp_attrs.Count; ++j) {
2401                                         //
2402                                         // LAMESPEC: No idea why `params' modifier is ignored
2403                                         //
2404                                         if ((parameters.FixedParameters [j].ModFlags & ~Parameter.Modifier.PARAMS) !=
2405                                                 (cmp_attrs.FixedParameters [j].ModFlags & ~Parameter.Modifier.PARAMS))
2406                                                 break;
2407
2408                                         if (!TypeManager.IsEqual (parameters.Types [j], cmp_attrs.Types [j]))
2409                                                 break;
2410                                 }
2411
2412                                 if (j < cmp_attrs.Count)
2413                                         continue;
2414
2415                                 //
2416                                 // check generic arguments for methods
2417                                 //
2418                                 if (mi != null) {
2419                                         Type [] cmpGenArgs = TypeManager.GetGenericArguments (mi);
2420                                         if (generic_method == null && cmpGenArgs != null && cmpGenArgs.Length != 0)
2421                                                 continue;
2422                                         if (generic_method != null && cmpGenArgs != null && cmpGenArgs.Length != generic_method.TypeParameters.Length)
2423                                                 continue;
2424                                 }
2425
2426                                 //
2427                                 // get one of the methods because this has the visibility info.
2428                                 //
2429                                 if (is_property) {
2430                                         mi = pi.GetGetMethod (true);
2431                                         if (mi == null)
2432                                                 mi = pi.GetSetMethod (true);
2433                                 }
2434
2435                                 //
2436                                 // Check visibility
2437                                 //
2438                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
2439                                 case MethodAttributes.PrivateScope:
2440                                         continue;
2441                                 case MethodAttributes.Private:
2442                                         //
2443                                         // A private method is Ok if we are a nested subtype.
2444                                         // The spec actually is not very clear about this, see bug 52458.
2445                                         //
2446                                         if (!invocation_type.Equals (entry.Container.Type) &&
2447                                             !TypeManager.IsNestedChildOf (invocation_type, entry.Container.Type))
2448                                                 continue;
2449                                         break;
2450                                 case MethodAttributes.FamANDAssem:
2451                                 case MethodAttributes.Assembly:
2452                                         //
2453                                         // Check for assembly methods
2454                                         //
2455                                         if (!TypeManager.IsThisOrFriendAssembly (mi.DeclaringType.Assembly))
2456                                                 continue;
2457                                         break;
2458                                 }
2459                                 return entry.Member;
2460                         }
2461
2462                         return null;
2463                 }
2464
2465                 /// <summary>
2466                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
2467                 /// We handle two cases. The first is for types without parameters (events, field, properties).
2468                 /// The second are methods, indexers and this is why ignore_complex_types is here.
2469                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
2470                 /// </summary>
2471                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
2472                 {
2473                         ArrayList applicable = null;
2474
2475                         if (method_hash != null)
2476                                 applicable = (ArrayList) method_hash [name];
2477
2478                         if (applicable != null) {
2479                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2480                                         CacheEntry entry = (CacheEntry) applicable [i];
2481                                         if ((entry.EntryType & EntryType.Public) != 0)
2482                                                 return entry.Member;
2483                                 }
2484                         }
2485
2486                         if (member_hash == null)
2487                                 return null;
2488                         applicable = (ArrayList) member_hash [name];
2489
2490                         if (applicable != null) {
2491                                 for (int i = applicable.Count - 1; i >= 0; i--) {
2492                                         CacheEntry entry = (CacheEntry) applicable [i];
2493                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
2494                                                 if (ignore_complex_types) {
2495                                                         if ((entry.EntryType & EntryType.Method) != 0)
2496                                                                 continue;
2497
2498                                                         // Does exist easier way how to detect indexer ?
2499                                                         if ((entry.EntryType & EntryType.Property) != 0) {
2500                                                                 AParametersCollection arg_types = TypeManager.GetParameterData ((PropertyInfo)entry.Member);
2501                                                                 if (arg_types.Count > 0)
2502                                                                         continue;
2503                                                         }
2504                                                 }
2505                                                 return entry.Member;
2506                                         }
2507                                 }
2508                         }
2509                         return null;
2510                 }
2511
2512                 Hashtable locase_table;
2513
2514                 /// <summary>
2515                 /// Builds low-case table for CLS Compliance test
2516                 /// </summary>
2517                 public Hashtable GetPublicMembers ()
2518                 {
2519                         if (locase_table != null)
2520                                 return locase_table;
2521
2522                         locase_table = new Hashtable ();
2523                         foreach (DictionaryEntry entry in member_hash) {
2524                                 ArrayList members = (ArrayList)entry.Value;
2525                                 for (int ii = 0; ii < members.Count; ++ii) {
2526                                         CacheEntry member_entry = (CacheEntry) members [ii];
2527
2528                                         if ((member_entry.EntryType & EntryType.Public) == 0)
2529                                                 continue;
2530
2531                                         // TODO: Does anyone know easier way how to detect that member is internal ?
2532                                         switch (member_entry.EntryType & EntryType.MaskType) {
2533                                         case EntryType.Constructor:
2534                                                 continue;
2535
2536                                         case EntryType.Field:
2537                                                 if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
2538                                                         continue;
2539                                                 break;
2540
2541                                         case EntryType.Method:
2542                                                 if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2543                                                         continue;
2544                                                 break;
2545
2546                                         case EntryType.Property:
2547                                                 PropertyInfo pi = (PropertyInfo)member_entry.Member;
2548                                                 if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
2549                                                         continue;
2550                                                 break;
2551
2552                                         case EntryType.Event:
2553                                                 EventInfo ei = (EventInfo)member_entry.Member;
2554                                                 MethodInfo mi = ei.GetAddMethod ();
2555                                                 if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
2556                                                         continue;
2557                                                 break;
2558                                         }
2559                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
2560                                         locase_table [lcase] = member_entry.Member;
2561                                         break;
2562                                 }
2563                         }
2564                         return locase_table;
2565                 }
2566
2567                 public Hashtable Members {
2568                         get {
2569                                 return member_hash;
2570                         }
2571                 }
2572
2573                 /// <summary>
2574                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
2575                 /// </summary>
2576                 ///
2577                 // TODO: refactor as method is always 'this'
2578                 public static void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
2579                 {
2580                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
2581
2582                         for (int i = 0; i < al.Count; ++i) {
2583                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
2584
2585                                 // skip itself
2586                                 if (entry.Member == this_builder)
2587                                         continue;
2588
2589                                 if ((entry.EntryType & tested_type) != tested_type)
2590                                         continue;
2591
2592                                 MethodBase method_to_compare = (MethodBase)entry.Member;
2593                                 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
2594                                         method.Parameters, TypeManager.GetParameterData (method_to_compare));
2595
2596                                 if (result == AttributeTester.Result.Ok)
2597                                         continue;
2598
2599                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
2600
2601                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
2602                                 // However it is exactly what csc does.
2603                                 if (md != null && !md.IsClsComplianceRequired ())
2604                                         continue;
2605
2606                                 Report.SymbolRelatedToPreviousError (entry.Member);
2607                                 switch (result) {
2608                                 case AttributeTester.Result.RefOutArrayError:
2609                                         Report.Warning (3006, 1, method.Location,
2610                                                         "Overloaded method `{0}' differing only in ref or out, or in array rank, is not CLS-compliant",
2611                                                         method.GetSignatureForError ());
2612                                         continue;
2613                                 case AttributeTester.Result.ArrayArrayError:
2614                                         Report.Warning (3007, 1, method.Location,
2615                                                         "Overloaded method `{0}' differing only by unnamed array types is not CLS-compliant",
2616                                                         method.GetSignatureForError ());
2617                                         continue;
2618                                 }
2619
2620                                 throw new NotImplementedException (result.ToString ());
2621                         }
2622                 }
2623
2624                 public bool CheckExistingMembersOverloads (MemberCore member, string name, Parameters parameters)
2625                 {
2626                         ArrayList entries = (ArrayList)member_hash [name];
2627                         if (entries == null)
2628                                 return true;
2629
2630                         int method_param_count = parameters.Count;
2631                         for (int i = entries.Count - 1; i >= 0; --i) {
2632                                 CacheEntry ce = (CacheEntry) entries [i];
2633
2634                                 if (ce.Container != member.Parent.PartialContainer)
2635                                         return true;
2636
2637                                 Type [] p_types;
2638                                 AParametersCollection pd;
2639                                 if ((ce.EntryType & EntryType.Property) != 0) {
2640                                         pd = TypeManager.GetParameterData ((PropertyInfo) ce.Member);
2641                                         p_types = pd.Types;
2642                                 } else {
2643                                         MethodBase mb = (MethodBase) ce.Member;
2644 #if GMCS_SOURCE
2645                                         // TODO: This is more like a hack, because we are adding generic methods
2646                                         // twice with and without arity name
2647                                         if (mb.IsGenericMethod && !member.MemberName.IsGeneric)
2648                                                 continue;
2649 #endif
2650                                         pd = TypeManager.GetParameterData (mb);
2651                                         p_types = pd.Types;
2652                                 }
2653
2654                                 if (p_types.Length != method_param_count)
2655                                         continue;
2656
2657                                 if (method_param_count > 0) {
2658                                         int ii = method_param_count - 1;
2659                                         Type type_a, type_b;
2660                                         do {
2661                                                 type_a = parameters.Types [ii];
2662                                                 type_b = p_types [ii];
2663
2664 #if GMCS_SOURCE
2665                                                 if (type_a.IsGenericParameter && type_a.DeclaringMethod != null)
2666                                                         type_a = null;
2667
2668                                                 if (type_b.IsGenericParameter && type_b.DeclaringMethod != null)
2669                                                         type_b = null;
2670 #endif
2671                                                 if ((pd.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF) !=
2672                                                         (parameters.FixedParameters [ii].ModFlags & Parameter.Modifier.ISBYREF))
2673                                                         type_a = null;
2674
2675                                         } while (type_a == type_b && ii-- != 0);
2676
2677                                         if (ii >= 0)
2678                                                 continue;
2679
2680                                         //
2681                                         // Operators can differ in return type only
2682                                         //
2683                                         if (member is Operator) {
2684                                                 Operator op = TypeManager.GetMethod ((MethodBase) ce.Member) as Operator;
2685                                                 if (op != null && op.ReturnType != ((Operator) member).ReturnType)
2686                                                         continue;
2687                                         }
2688
2689                                         //
2690                                         // Report difference in parameter modifiers only
2691                                         //
2692                                         if (pd != null && member is MethodCore) {
2693                                                 ii = method_param_count;
2694                                                 while (ii-- != 0 && parameters.FixedParameters [ii].ModFlags == pd.FixedParameters [ii].ModFlags &&
2695                                                         parameters.ExtensionMethodType == pd.ExtensionMethodType);
2696
2697                                                 if (ii >= 0) {
2698                                                         MethodCore mc = TypeManager.GetMethod ((MethodBase) ce.Member) as MethodCore;
2699                                                         Report.SymbolRelatedToPreviousError (ce.Member);
2700                                                         if ((member.ModFlags & Modifiers.PARTIAL) != 0 && (mc.ModFlags & Modifiers.PARTIAL) != 0) {
2701                                                                 if (parameters.HasParams || pd.HasParams) {
2702                                                                         Report.Error (758, member.Location,
2703                                                                                 "A partial method declaration and partial method implementation cannot differ on use of `params' modifier");
2704                                                                 } else {
2705                                                                         Report.Error (755, member.Location,
2706                                                                                 "A partial method declaration and partial method implementation must be both an extension method or neither");
2707                                                                 }
2708                                                         } else {
2709                                                                 Report.Error (663, member.Location,
2710                                                                         "An overloaded method `{0}' cannot differ on use of parameter modifiers only",
2711                                                                         member.GetSignatureForError ());
2712                                                         }
2713                                                         return false;
2714                                                 }
2715                                         }
2716                                 }
2717
2718                                 if ((ce.EntryType & EntryType.Method) != 0) {
2719                                         Method method_a = member as Method;
2720                                         Method method_b = TypeManager.GetMethod ((MethodBase) ce.Member) as Method;
2721                                         if (method_a != null && method_b != null && (method_a.ModFlags & method_b.ModFlags & Modifiers.PARTIAL) != 0) {
2722                                                 const int partial_modifiers = Modifiers.STATIC | Modifiers.UNSAFE;
2723                                                 if (method_a.IsPartialDefinition == method_b.IsPartialImplementation) {
2724                                                         if ((method_a.ModFlags & partial_modifiers) == (method_b.ModFlags & partial_modifiers) ||
2725                                                                 method_a.Parent.IsInUnsafeScope && method_b.Parent.IsInUnsafeScope) {
2726                                                                 if (method_a.IsPartialImplementation) {
2727                                                                         method_a.SetPartialDefinition (method_b);
2728                                                                         entries.RemoveAt (i);
2729                                                                 } else {
2730                                                                         method_b.SetPartialDefinition (method_a);
2731                                                                 }
2732                                                                 continue;
2733                                                         }
2734
2735                                                         if ((method_a.ModFlags & Modifiers.STATIC) != (method_b.ModFlags & Modifiers.STATIC)) {
2736                                                                 Report.SymbolRelatedToPreviousError (ce.Member);
2737                                                                 Report.Error (763, member.Location,
2738                                                                         "A partial method declaration and partial method implementation must be both `static' or neither");
2739                                                         }
2740
2741                                                         Report.SymbolRelatedToPreviousError (ce.Member);
2742                                                         Report.Error (764, member.Location,
2743                                                                 "A partial method declaration and partial method implementation must be both `unsafe' or neither");
2744                                                         return false;
2745                                                 }
2746
2747                                                 Report.SymbolRelatedToPreviousError (ce.Member);
2748                                                 if (method_a.IsPartialDefinition) {
2749                                                         Report.Error (756, member.Location, "A partial method `{0}' declaration is already defined",
2750                                                                 member.GetSignatureForError ());
2751                                                 }
2752
2753                                                 Report.Error (757, member.Location, "A partial method `{0}' implementation is already defined",
2754                                                         member.GetSignatureForError ());
2755                                                 return false;
2756                                         }
2757
2758                                         Report.SymbolRelatedToPreviousError (ce.Member);
2759                                         IMethodData duplicate_member = TypeManager.GetMethod ((MethodBase) ce.Member);
2760                                         if (member is Operator && duplicate_member is Operator) {
2761                                                 Report.Error (557, member.Location, "Duplicate user-defined conversion in type `{0}'",
2762                                                         member.Parent.GetSignatureForError ());
2763                                                 return false;
2764                                         }
2765
2766                                         bool is_reserved_a = member is AbstractPropertyEventMethod || member is Operator;
2767                                         bool is_reserved_b = duplicate_member is AbstractPropertyEventMethod || duplicate_member is Operator;
2768
2769                                         if (is_reserved_a || is_reserved_b) {
2770                                                 Report.Error (82, member.Location, "A member `{0}' is already reserved",
2771                                                         is_reserved_a ?
2772                                                         TypeManager.GetFullNameSignature (ce.Member) :
2773                                                         member.GetSignatureForError ());
2774                                                 return false;
2775                                         }
2776                                 } else {
2777                                         Report.SymbolRelatedToPreviousError (ce.Member);
2778                                 }
2779
2780                                 Report.Error (111, member.Location,
2781                                         "A member `{0}' is already defined. Rename this member or use different parameter types",
2782                                         member.GetSignatureForError ());
2783                                 return false;
2784                         }
2785
2786                         return true;
2787                 }
2788         }
2789 }