mcs/mcs/decl.cs

   1 //
   2 // decl.cs: Declaration base class for structs, classes, enums and interfaces.
   3 //
   4 // Author: Miguel de Icaza (miguel@gnu.org)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10 // (C) 2004 Novell, Inc
  11 //
  12 // TODO: Move the method verification stuff from the class.cs and interface.cs here
  13 //
  14
  15 using System;
  16 using System.Collections;
  17 using System.Globalization;
  18 using System.Reflection.Emit;
  19 using System.Reflection;
  20
  21 #if BOOTSTRAP_WITH_OLDLIB
  22 using XmlElement = System.Object;
  23 #else
  24 using System.Xml;
  25 #endif
  26
  27 namespace Mono.CSharp {
  28
  29         public class MemberName {
  30                 public readonly string Name;
  31                 public readonly MemberName Left;
  32
  33                 public static readonly MemberName Null = new MemberName ("");
  34
  35                 public MemberName (string name)
  36                 {
  37                         this.Name = name;
  38                 }
  39
  40                 public MemberName (MemberName left, string name)
  41                         : this (name)
  42                 {
  43                         this.Left = left;
  44                 }
  45
  46                 public MemberName (MemberName left, MemberName right)
  47                 {
  48                         Name = right.Name;
  49                         Left = (right.Left == null) ? left : new MemberName (left, right.Left);
  50                 }
  51
  52                 static readonly char [] dot_array = { '.' };
  53
  54                 public static MemberName FromDotted (string name)
  55                 {
  56                         string [] elements = name.Split (dot_array);
  57                         int count = elements.Length;
  58                         int i = 0;
  59                         MemberName n = new MemberName (elements [i++]);
  60                         while (i < count)
  61                                 n = new MemberName (n, elements [i++]);
  62                         return n;
  63                 }
  64
  65                 public string GetName ()
  66                 {
  67                         return GetName (false);
  68                 }
  69
  70                 public string GetName (bool is_generic)
  71                 {
  72                         string name = is_generic ? Basename : Name;
  73                         if (Left != null)
  74                                 return Left.GetName (is_generic) + "." + name;
  75                         else
  76                                 return name;
  77                 }
  78
  79                 ///
  80                 /// This returns exclusively the name as seen on the source code
  81                 /// it is not the fully qualifed type after resolution
  82                 ///
  83                 public string GetPartialName ()
  84                 {
  85                         if (Left != null)
  86                                 return Left.GetPartialName () + "." + Name;
  87                         else
  88                                 return Name;
  89                 }
  90
  91                 public string GetTypeName ()
  92                 {
  93                         if (Left != null)
  94                                 return Left.GetTypeName () + "." + Name;
  95                         else
  96                                 return Name;
  97                 }
  98
  99                 public Expression GetTypeExpression (Location loc)
 100                 {
 101                         if (Left != null) {
 102                                 Expression lexpr = Left.GetTypeExpression (loc);
 103
 104                                 return new MemberAccess (lexpr, Name, loc);
 105                         } else {
 106                                 return new SimpleName (Name, loc);
 107                         }
 108                 }
 109
 110                 public MemberName Clone ()
 111                 {
 112                         if (Left != null)
 113                                 return new MemberName (Left.Clone (), Name);
 114                         else
 115                                 return new MemberName (Name);
 116                 }
 117
 118                 public string Basename {
 119                         get {
 120                                 return Name;
 121                         }
 122                 }
 123
 124                 public override string ToString ()
 125                 {
 126                         if (Left != null)
 127                                 return Left + "." + Name;
 128                         else
 129                                 return Name;
 130                 }
 131
 132                 public override bool Equals (object other)
 133                 {
 134                         return Equals (other as MemberName);
 135                 }
 136
 137                 public bool Equals (MemberName other)
 138                 {
 139                         if (this == other)
 140                                 return true;
 141                         if (other == null || Name != other.Name)
 142                                 return false;
 143 #if NET_2_0
 144                         if (TypeArguments == null)
 145                                 return other.TypeArguments == null;
 146
 147                         if (other.TypeArguments == null || TypeArguments.Count != other.TypeArguments.Count)
 148                                 return false;
 149 #endif
 150                         if (Left == null)
 151                                 return other.Left == null;
 152
 153                         return Left.Equals (other.Left);
 154                 }
 155
 156                 public override int GetHashCode ()
 157                 {
 158                         int hash = Name.GetHashCode ();
 159                         for (MemberName n = Left; n != null; n = n.Left)
 160                                 hash ^= n.Name.GetHashCode ();
 161
 162 #if NET_2_0
 163                         if (TypeArguments != null)
 164                                 hash ^= TypeArguments.Count << 5;
 165 #endif
 166
 167                         return hash & 0x7FFFFFFF;
 168                 }
 169         }
 170
 171         /// <summary>
 172         ///   Base representation for members.  This is used to keep track
 173         ///   of Name, Location and Modifier flags, and handling Attributes.
 174         /// </summary>
 175         public abstract class MemberCore : Attributable {
 176                 /// <summary>
 177                 ///   Public name
 178                 /// </summary>
 179
 180                 protected string cached_name;
 181                 public string Name {
 182                         get {
 183                                 if (cached_name == null)
 184                                         cached_name = MemberName.GetName (false);
 185                                 return cached_name;
 186                         }
 187                 }
 188
 189                 // Is not readonly because of IndexerName attribute
 190                 private MemberName member_name;
 191                 public MemberName MemberName {
 192                         get { return member_name; }
 193                 }
 194
 195                 /// <summary>
 196                 ///   Modifier flags that the user specified in the source code
 197                 /// </summary>
 198                 public int ModFlags;
 199
 200                 public /*readonly*/ TypeContainer Parent;
 201
 202                 /// <summary>
 203                 ///   Location where this declaration happens
 204                 /// </summary>
 205                 public readonly Location Location;
 206
 207                 /// <summary>
 208                 ///   XML documentation comment
 209                 /// </summary>
 210                 public string DocComment;
 211
 212                 /// <summary>
 213                 ///   Represents header string for documentation comment
 214                 ///   for each member types.
 215                 /// </summary>
 216                 public abstract string DocCommentHeader { get; }
 217
 218                 [Flags]
 219                 public enum Flags {
 220                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 221                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 222                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 223                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 224                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 225                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 226                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 227                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 228                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 229                         Excluded = 1 << 9,                                      // Method is conditional
 230                         TestMethodDuplication = 1 << 10,                // Test for duplication must be performed
 231                         IsUsed = 1 << 11
 232                 }
 233
 234                 /// <summary>
 235                 ///   MemberCore flags at first detected then cached
 236                 /// </summary>
 237                 internal Flags caching_flags;
 238
 239                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs,
 240                                    Location loc)
 241                         : base (attrs)
 242                 {
 243                         if (parent is PartialContainer && !(this is PartialContainer))
 244                                 throw new InternalErrorException ("A PartialContainer cannot be the direct parent of a member");
 245
 246                         Parent = parent;
 247                         member_name = name;
 248                         Location = loc;
 249                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 250                 }
 251
 252                 protected virtual void SetMemberName (MemberName new_name)
 253                 {
 254                         member_name = new_name;
 255                         cached_name = null;
 256                 }
 257
 258                 /// <summary>
 259                 /// Tests presence of ObsoleteAttribute and report proper error
 260                 /// </summary>
 261                 protected void CheckUsageOfObsoleteAttribute (Type type)
 262                 {
 263                         if (type == null)
 264                                 return;
 265
 266                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
 267                         if (obsolete_attr == null)
 268                                 return;
 269
 270                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
 271                 }
 272
 273                 public abstract bool Define ();
 274
 275                 //
 276                 // Returns full member name for error message
 277                 //
 278                 public virtual string GetSignatureForError ()
 279                 {
 280                         return Name;
 281                 }
 282
 283                 /// <summary>
 284                 /// Use this method when MethodBuilder is null
 285                 /// </summary>
 286                 public virtual string GetSignatureForError (TypeContainer tc)
 287                 {
 288                         return Name;
 289                 }
 290
 291                 /// <summary>
 292                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 293                 /// </summary>
 294                 public virtual void Emit ()
 295                 {
 296                         // Hack with Parent == null is for EnumMember
 297                         if (Parent == null || (GetObsoleteAttribute (Parent) == null && Parent.GetObsoleteAttribute (Parent) == null))
 298                                 VerifyObsoleteAttribute ();
 299
 300                         if (!RootContext.VerifyClsCompliance)
 301                                 return;
 302
 303                         VerifyClsCompliance (Parent);
 304                 }
 305
 306                 public bool InUnsafe {
 307                         get {
 308                                 return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
 309                         }
 310                 }
 311
 312                 public virtual bool IsUsed {
 313                         get {
 314                                 return (caching_flags & Flags.IsUsed) != 0;
 315                         }
 316                 }
 317
 318                 public void SetMemberIsUsed ()
 319                 {
 320                         caching_flags |= Flags.IsUsed;
 321                 }
 322
 323                 //
 324                 // Whehter is it ok to use an unsafe pointer in this type container
 325                 //
 326                 public bool UnsafeOK (DeclSpace parent)
 327                 {
 328                         //
 329                         // First check if this MemberCore modifier flags has unsafe set
 330                         //
 331                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 332                                 return true;
 333
 334                         if (parent.UnsafeContext)
 335                                 return true;
 336
 337                         Expression.UnsafeError (Location);
 338                         return false;
 339                 }
 340
 341                 /// <summary>
 342                 /// Returns instance of ObsoleteAttribute for this MemberCore
 343                 /// </summary>
 344                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 345                 {
 346                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 347                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 348                                 return null;
 349                         }
 350
 351                         caching_flags &= ~Flags.Obsolete_Undetected;
 352
 353                         if (OptAttributes == null)
 354                                 return null;
 355
 356                         Attribute obsolete_attr = OptAttributes.Search (
 357                                 TypeManager.obsolete_attribute_type, ds.EmitContext);
 358                         if (obsolete_attr == null)
 359                                 return null;
 360
 361                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds.EmitContext);
 362                         if (obsolete == null)
 363                                 return null;
 364
 365                         caching_flags |= Flags.Obsolete;
 366                         return obsolete;
 367                 }
 368
 369                 /// <summary>
 370                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 371                 /// </summary>
 372                 public override bool IsClsCompliaceRequired (DeclSpace container)
 373                 {
 374                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 375                                 return (caching_flags & Flags.ClsCompliant) != 0;
 376
 377                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 378                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 379                                 caching_flags |= Flags.ClsCompliant;
 380                                 return true;
 381                         }
 382
 383                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 384                         return false;
 385                 }
 386
 387                 /// <summary>
 388                 /// Returns true when MemberCore is exposed from assembly.
 389                 /// </summary>
 390                 public bool IsExposedFromAssembly (DeclSpace ds)
 391                 {
 392                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 393                                 return false;
 394
 395                         DeclSpace parentContainer = ds;
 396                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 397                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 398                                         return false;
 399                                 parentContainer = parentContainer.Parent;
 400                         }
 401                         return true;
 402                 }
 403
 404                 /// <summary>
 405                 /// Resolve CLSCompliantAttribute value or gets cached value.
 406                 /// </summary>
 407                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 408                 {
 409                         if (OptAttributes != null) {
 410                                 Attribute cls_attribute = OptAttributes.Search (
 411                                         TypeManager.cls_compliant_attribute_type, ds.EmitContext);
 412                                 if (cls_attribute != null) {
 413                                         caching_flags |= Flags.HasClsCompliantAttribute;
 414                                         return cls_attribute.GetClsCompliantAttributeValue (ds.EmitContext);
 415                                 }
 416                         }
 417                         return ds.GetClsCompliantAttributeValue ();
 418                 }
 419
 420                 /// <summary>
 421                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 422                 /// </summary>
 423                 protected bool HasClsCompliantAttribute {
 424                         get {
 425                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 426                         }
 427                 }
 428
 429                 /// <summary>
 430                 /// It helps to handle error 102 & 111 detection
 431                 /// </summary>
 432                 public virtual bool MarkForDuplicationCheck ()
 433                 {
 434                         return false;
 435                 }
 436
 437                 /// <summary>
 438                 /// The main virtual method for CLS-Compliant verifications.
 439                 /// The method returns true if member is CLS-Compliant and false if member is not
 440                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 441                 /// and add their extra verifications.
 442                 /// </summary>
 443                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 444                 {
 445                         if (!IsClsCompliaceRequired (ds)) {
 446                                 if (HasClsCompliantAttribute && RootContext.WarningLevel >= 2) {
 447                                         if (!IsExposedFromAssembly (ds))
 448                                                 Report.Warning (3019, Location, "CLS compliance checking will not be performed on '{0}' because it is private or internal", GetSignatureForError ());
 449                                         if (!CodeGen.Assembly.IsClsCompliant)
 450                                                 Report.Warning (3021, Location, "'{0}' does not need a CLSCompliant attribute because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 451                                 }
 452                                 return false;
 453                         }
 454
 455                         if (!CodeGen.Assembly.IsClsCompliant) {
 456                                 if (HasClsCompliantAttribute) {
 457                                         Report.Error (3014, Location, "'{0}' cannot be marked as CLS-compliant because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 458                                 }
 459                                 return false;
 460                         }
 461
 462                         int index = Name.LastIndexOf ('.');
 463                         if (Name [index > 0 ? index + 1 : 0] == '_') {
 464                                 Report.Error (3008, Location, "Identifier '{0}' is not CLS-compliant", GetSignatureForError () );
 465                         }
 466                         return true;
 467                 }
 468
 469                 protected abstract void VerifyObsoleteAttribute ();
 470
 471                 //
 472                 // Raised (and passed an XmlElement that contains the comment)
 473                 // when GenerateDocComment is writing documentation expectedly.
 474                 //
 475                 internal virtual void OnGenerateDocComment (DeclSpace ds, XmlElement intermediateNode)
 476                 {
 477                 }
 478
 479                 //
 480                 // Returns a string that represents the signature for this
 481                 // member which should be used in XML documentation.
 482                 //
 483                 public virtual string GetDocCommentName (DeclSpace ds)
 484                 {
 485                         if (ds == null || this is DeclSpace)
 486                                 return DocCommentHeader + Name;
 487                         else
 488                                 return String.Concat (DocCommentHeader, ds.Name, ".", Name);
 489                 }
 490
 491                 //
 492                 // Generates xml doc comments (if any), and if required,
 493                 // handle warning report.
 494                 //
 495                 internal virtual void GenerateDocComment (DeclSpace ds)
 496                 {
 497                         DocUtil.GenerateDocComment (this, ds);
 498                 }
 499         }
 500
 501         /// <summary>
 502         ///   Base class for structs, classes, enumerations and interfaces.
 503         /// </summary>
 504         /// <remarks>
 505         ///   They all create new declaration spaces.  This
 506         ///   provides the common foundation for managing those name
 507         ///   spaces.
 508         /// </remarks>
 509         public abstract class DeclSpace : MemberCore, IAlias {
 510                 /// <summary>
 511                 ///   This points to the actual definition that is being
 512                 ///   created with System.Reflection.Emit
 513                 /// </summary>
 514                 public TypeBuilder TypeBuilder;
 515
 516                 //
 517                 // This is the namespace in which this typecontainer
 518                 // was declared.  We use this to resolve names.
 519                 //
 520                 public NamespaceEntry NamespaceEntry;
 521
 522                 private Hashtable Cache = new Hashtable ();
 523
 524                 public string Basename;
 525
 526                 protected Hashtable defined_names;
 527
 528                 // The emit context for toplevel objects.
 529                 protected EmitContext ec;
 530
 531                 public EmitContext EmitContext {
 532                         get { return ec; }
 533                 }
 534
 535                 static string[] attribute_targets = new string [] { "type" };
 536
 537                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 538                                   Attributes attrs, Location l)
 539                         : base (parent, name, attrs, l)
 540                 {
 541                         NamespaceEntry = ns;
 542                         Basename = name.Name;
 543                         defined_names = new Hashtable ();
 544                 }
 545
 546                 /// <summary>
 547                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 548                 /// </summary>
 549                 protected bool AddToContainer (MemberCore symbol, string name)
 550                 {
 551                         if (name == Basename && !(this is Interface) && !(this is Enum)) {
 552                                 Report.SymbolRelatedToPreviousError (this);
 553                                 Report.Error (542,  symbol.Location, "'{0}': member names cannot be the same as their enclosing type", symbol.GetSignatureForError ());
 554                                 return false;
 555                         }
 556
 557                         MemberCore mc = (MemberCore) defined_names [name];
 558
 559                         if (mc == null) {
 560                                 defined_names.Add (name, symbol);
 561                                 return true;
 562                         }
 563
 564                         if (symbol.MarkForDuplicationCheck () && mc.MarkForDuplicationCheck ())
 565                                 return true;
 566
 567                         Report.SymbolRelatedToPreviousError (mc);
 568                         Report.Error (102, symbol.Location, "The type '{0}' already contains a definition for '{1}'", GetSignatureForError (), name);
 569                         return false;
 570                 }
 571
 572                 /// <summary>
 573                 ///   Returns the MemberCore associated with a given name in the declaration
 574                 ///   space. It doesn't return method based symbols !!
 575                 /// </summary>
 576                 ///
 577                 public MemberCore GetDefinition (string name)
 578                 {
 579                         return (MemberCore)defined_names [name];
 580                 }
 581
 582                 //
 583                 // root_types contains all the types.  All TopLevel types
 584                 // hence have a parent that points to `root_types', that is
 585                 // why there is a non-obvious test down here.
 586                 //
 587                 public bool IsTopLevel {
 588                         get {
 589                                 if (Parent != null){
 590                                         if (Parent.Parent == null)
 591                                                 return true;
 592                                 }
 593                                 return false;
 594                         }
 595                 }
 596
 597                 public virtual void CloseType ()
 598                 {
 599                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 600                                 try {
 601                                         TypeBuilder.CreateType ();
 602                                 } catch {
 603                                         //
 604                                         // The try/catch is needed because
 605                                         // nested enumerations fail to load when they
 606                                         // are defined.
 607                                         //
 608                                         // Even if this is the right order (enumerations
 609                                         // declared after types).
 610                                         //
 611                                         // Note that this still creates the type and
 612                                         // it is possible to save it
 613                                 }
 614                                 caching_flags |= Flags.CloseTypeCreated;
 615                         }
 616                 }
 617
 618                 protected virtual TypeAttributes TypeAttr {
 619                         get {
 620                                 return CodeGen.Module.DefaultCharSetType;
 621                         }
 622                 }
 623
 624                 /// <remarks>
 625                 ///  Should be overriten by the appropriate declaration space
 626                 /// </remarks>
 627                 public abstract TypeBuilder DefineType ();
 628
 629                 /// <summary>
 630                 ///   Define all members, but don't apply any attributes or do anything which may
 631                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 632                 /// </summary>
 633                 public abstract bool DefineMembers (TypeContainer parent);
 634
 635                 //
 636                 // Whether this is an `unsafe context'
 637                 //
 638                 public bool UnsafeContext {
 639                         get {
 640                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 641                                         return true;
 642                                 if (Parent != null)
 643                                         return Parent.UnsafeContext;
 644                                 return false;
 645                         }
 646                 }
 647
 648                 EmitContext type_resolve_ec;
 649                 protected EmitContext TypeResolveEmitContext {
 650                         get {
 651                                 if (type_resolve_ec == null) {
 652                                         // FIXME: I think this should really be one of:
 653                                         //
 654                                         // a. type_resolve_ec = Parent.EmitContext;
 655                                         // b. type_resolve_ec = new EmitContext (Parent, Parent, loc, null, null, ModFlags, false);
 656                                         //
 657                                         // However, if Parent == RootContext.Tree.Types, its NamespaceEntry will be null.
 658                                         //
 659                                         type_resolve_ec = new EmitContext (Parent, this, Location.Null, null, null, ModFlags, false);
 660                                 }
 661                                 return type_resolve_ec;
 662                         }
 663                 }
 664
 665                 // <summary>
 666                 //    Resolves the expression `e' for a type, and will recursively define
 667                 //    types.  This should only be used for resolving base types.
 668                 // </summary>
 669                 public TypeExpr ResolveBaseTypeExpr (Expression e, bool silent, Location loc)
 670                 {
 671                         TypeResolveEmitContext.loc = loc;
 672                         TypeResolveEmitContext.ContainerType = TypeBuilder;
 673
 674                         return e.ResolveAsTypeTerminal (TypeResolveEmitContext, silent);
 675                 }
 676
 677                 public bool CheckAccessLevel (Type check_type)
 678                 {
 679                         if (check_type == TypeBuilder)
 680                                 return true;
 681
 682                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 683
 684                         //
 685                         // Broken Microsoft runtime, return public for arrays, no matter what
 686                         // the accessibility is for their underlying class, and they return
 687                         // NonPublic visibility for pointers
 688                         //
 689                         if (check_type.IsArray || check_type.IsPointer)
 690                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 691
 692                         if (TypeBuilder == null)
 693                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 694                                 //        However, this is invoked again later -- so safe to return true.
 695                                 //        May also be null when resolving top-level attributes.
 696                                 return true;
 697
 698                         switch (check_attr){
 699                         case TypeAttributes.Public:
 700                                 return true;
 701
 702                         case TypeAttributes.NotPublic:
 703                                 //
 704                                 // This test should probably use the declaringtype.
 705                                 //
 706                                 return check_type.Assembly == TypeBuilder.Assembly;
 707
 708                         case TypeAttributes.NestedPublic:
 709                                 return true;
 710
 711                         case TypeAttributes.NestedPrivate:
 712                                 return NestedAccessible (check_type);
 713
 714                         case TypeAttributes.NestedFamily:
 715                                 return FamilyAccessible (check_type);
 716
 717                         case TypeAttributes.NestedFamANDAssem:
 718                                 return (check_type.Assembly == TypeBuilder.Assembly) &&
 719                                         FamilyAccessible (check_type);
 720
 721                         case TypeAttributes.NestedFamORAssem:
 722                                 return (check_type.Assembly == TypeBuilder.Assembly) ||
 723                                         FamilyAccessible (check_type);
 724
 725                         case TypeAttributes.NestedAssembly:
 726                                 return check_type.Assembly == TypeBuilder.Assembly;
 727                         }
 728
 729                         Console.WriteLine ("HERE: " + check_attr);
 730                         return false;
 731
 732                 }
 733
 734                 protected bool NestedAccessible (Type check_type)
 735                 {
 736                         Type declaring = check_type.DeclaringType;
 737                         return TypeBuilder == declaring ||
 738                                 TypeManager.IsNestedChildOf (TypeBuilder, declaring);
 739                 }
 740
 741                 protected bool FamilyAccessible (Type check_type)
 742                 {
 743                         Type declaring = check_type.DeclaringType;
 744                         return TypeManager.IsNestedFamilyAccessible (TypeBuilder, declaring);
 745                 }
 746
 747                 // Access level of a type.
 748                 const int X = 1;
 749                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 750                                             // Public    Assembly   Protected
 751                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 752                         Public              = (X << 0) | (X << 1) | (X << 2),
 753                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 754                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 755                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 756                 }
 757
 758                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 759                 {
 760                         if ((flags & Modifiers.INTERNAL) != 0) {
 761
 762                                 if ((flags & Modifiers.PROTECTED) != 0)
 763                                         return AccessLevel.ProtectedOrInternal;
 764                                 else
 765                                         return AccessLevel.Internal;
 766
 767                         } else if ((flags & Modifiers.PROTECTED) != 0)
 768                                 return AccessLevel.Protected;
 769
 770                         else if ((flags & Modifiers.PRIVATE) != 0)
 771                                 return AccessLevel.Private;
 772
 773                         else
 774                                 return AccessLevel.Public;
 775                 }
 776
 777                 // What is the effective access level of this?
 778                 // TODO: Cache this?
 779                 AccessLevel EffectiveAccessLevel {
 780                         get {
 781                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 782                                 if (!IsTopLevel && (Parent != null))
 783                                         return myAccess & Parent.EffectiveAccessLevel;
 784                                 else
 785                                         return myAccess;
 786                         }
 787                 }
 788
 789                 // Return the access level for type `t'
 790                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 791                 {
 792                         if (t.IsPublic)
 793                                 return AccessLevel.Public;
 794                         if (t.IsNestedPrivate)
 795                                 return AccessLevel.Private;
 796                         if (t.IsNotPublic)
 797                                 return AccessLevel.Internal;
 798
 799                         // By now, it must be nested
 800                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
 801
 802                         if (t.IsNestedPublic)
 803                                 return parentLevel;
 804                         if (t.IsNestedAssembly)
 805                                 return parentLevel & AccessLevel.Internal;
 806                         if (t.IsNestedFamily)
 807                                 return parentLevel & AccessLevel.Protected;
 808                         if (t.IsNestedFamORAssem)
 809                                 return parentLevel & AccessLevel.ProtectedOrInternal;
 810                         if (t.IsNestedFamANDAssem)
 811                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 812
 813                         // nested private is taken care of
 814
 815                         throw new Exception ("I give up, what are you?");
 816                 }
 817
 818                 //
 819                 // This answers `is the type P, as accessible as a member M which has the
 820                 // accessability @flags which is declared as a nested member of the type T, this declspace'
 821                 //
 822                 public bool AsAccessible (Type p, int flags)
 823                 {
 824                         //
 825                         // 1) if M is private, its accessability is the same as this declspace.
 826                         // we already know that P is accessible to T before this method, so we
 827                         // may return true.
 828                         //
 829
 830                         if ((flags & Modifiers.PRIVATE) != 0)
 831                                 return true;
 832
 833                         while (p.IsArray || p.IsPointer || p.IsByRef)
 834                                 p = TypeManager.GetElementType (p);
 835
 836                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
 837                         AccessLevel mAccess = this.EffectiveAccessLevel &
 838                                 GetAccessLevelFromModifiers (flags);
 839
 840                         // for every place from which we can access M, we must
 841                         // be able to access P as well. So, we want
 842                         // For every bit in M and P, M_i -> P_1 == true
 843                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
 844
 845                         return ~ (~ mAccess | pAccess) == 0;
 846                 }
 847
 848                 public static void Error_AmbiguousTypeReference (Location loc, string name, string t1, string t2)
 849                 {
 850                         Report.Error (104, loc,
 851                                       "`{0}' is an ambiguous reference ({1} or {2})",
 852                                       name, t1, t2);
 853                 }
 854
 855                 //
 856                 // Return the nested type with name @name.  Ensures that the nested type
 857                 // is defined if necessary.  Do _not_ use this when you have a MemberCache handy.
 858                 //
 859                 public virtual Type FindNestedType (string name)
 860                 {
 861                         return null;
 862                 }
 863
 864                 private Type LookupNestedTypeInHierarchy (string name)
 865                 {
 866                         // if the member cache has been created, lets use it.
 867                         // the member cache is MUCH faster.
 868                         if (MemberCache != null)
 869                                 return MemberCache.FindNestedType (name);
 870
 871                         // no member cache. Do it the hard way -- reflection
 872                         Type t = null;
 873                         for (Type current_type = TypeBuilder;
 874                              current_type != null && current_type != TypeManager.object_type;
 875                              current_type = current_type.BaseType) {
 876                                 if (current_type is TypeBuilder) {
 877                                         DeclSpace decl = this;
 878                                         if (current_type != TypeBuilder)
 879                                                 decl = TypeManager.LookupDeclSpace (current_type);
 880                                         t = decl.FindNestedType (name);
 881                                 } else {
 882                                         t = TypeManager.GetNestedType (current_type, name);
 883                                 }
 884
 885                                 if (t != null && CheckAccessLevel (t))
 886                                         return t;
 887                         }
 888
 889                         return null;
 890                 }
 891
 892                 //
 893                 // Public function used to locate types, this can only
 894                 // be used after the ResolveTree function has been invoked.
 895                 //
 896                 // Set 'ignore_cs0104' to true if you want to ignore cs0104 errors.
 897                 //
 898                 // Returns: Type or null if they type can not be found.
 899                 //
 900                 public FullNamedExpression LookupType (string name, Location loc, bool ignore_cs0104)
 901                 {
 902                         if (this is PartialContainer)
 903                                 throw new InternalErrorException ("Should not get here");
 904
 905                         if (Cache.Contains (name))
 906                                 return (FullNamedExpression) Cache [name];
 907
 908                         FullNamedExpression e;
 909                         Type t = LookupNestedTypeInHierarchy (name);
 910                         if (t != null)
 911                                 e = new TypeExpression (t, Location.Null);
 912                         else if (Parent != null && Parent != RootContext.Tree.Types)
 913                                 e = Parent.LookupType (name, loc, ignore_cs0104);
 914                         else
 915                                 e = NamespaceEntry.LookupNamespaceOrType (this, name, loc, ignore_cs0104);
 916
 917                         Cache [name] = e;
 918                         return e;
 919                 }
 920
 921                 /// <remarks>
 922                 ///   This function is broken and not what you're looking for.  It should only
 923                 ///   be used while the type is still being created since it doesn't use the cache
 924                 ///   and relies on the filter doing the member name check.
 925                 /// </remarks>
 926                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
 927                                                         MemberFilter filter, object criteria);
 928
 929                 /// <remarks>
 930                 ///   If we have a MemberCache, return it.  This property may return null if the
 931                 ///   class doesn't have a member cache or while it's still being created.
 932                 /// </remarks>
 933                 public abstract MemberCache MemberCache {
 934                         get;
 935                 }
 936
 937                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
 938                 {
 939                         if (a.Type == TypeManager.required_attr_type) {
 940                                 Report.Error (1608, a.Location, "The RequiredAttribute attribute is not permitted on C# types");
 941                                 return;
 942                         }
 943                         TypeBuilder.SetCustomAttribute (cb);
 944                 }
 945
 946                 /// <summary>
 947                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
 948                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
 949                 /// </summary>
 950                 public bool GetClsCompliantAttributeValue ()
 951                 {
 952                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
 953                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
 954
 955                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
 956
 957                         if (OptAttributes != null) {
 958                                 Attribute cls_attribute = OptAttributes.Search (TypeManager.cls_compliant_attribute_type, ec);
 959                                 if (cls_attribute != null) {
 960                                         caching_flags |= Flags.HasClsCompliantAttribute;
 961                                         if (cls_attribute.GetClsCompliantAttributeValue (ec)) {
 962                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 963                                                 return true;
 964                                         }
 965                                         return false;
 966                                 }
 967                         }
 968
 969                         if (Parent == null) {
 970                                 if (CodeGen.Assembly.IsClsCompliant) {
 971                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
 972                                         return true;
 973                                 }
 974                                 return false;
 975                         }
 976
 977                         if (Parent.GetClsCompliantAttributeValue ()) {
 978                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
 979                                 return true;
 980                         }
 981                         return false;
 982                 }
 983
 984                 public override string[] ValidAttributeTargets {
 985                         get {
 986                                 return attribute_targets;
 987                         }
 988                 }
 989
 990                 bool IAlias.IsType {
 991                         get { return true; }
 992                 }
 993
 994                 string IAlias.Name {
 995                         get { return Name; }
 996                 }
 997
 998                 TypeExpr IAlias.ResolveAsType (EmitContext ec)
 999                 {
1000                         if (TypeBuilder == null)
1001                                 throw new InvalidOperationException ();
1002
1003                         return new TypeExpression (TypeBuilder, Location);
1004                 }
1005         }
1006
1007         /// <summary>
1008         ///   This is a readonly list of MemberInfo's.
1009         /// </summary>
1010         public class MemberList : IList {
1011                 public readonly IList List;
1012                 int count;
1013
1014                 /// <summary>
1015                 ///   Create a new MemberList from the given IList.
1016                 /// </summary>
1017                 public MemberList (IList list)
1018                 {
1019                         if (list != null)
1020                                 this.List = list;
1021                         else
1022                                 this.List = new ArrayList ();
1023                         count = List.Count;
1024                 }
1025
1026                 /// <summary>
1027                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1028                 /// </summary>
1029                 public MemberList (IList first, IList second)
1030                 {
1031                         ArrayList list = new ArrayList ();
1032                         list.AddRange (first);
1033                         list.AddRange (second);
1034                         count = list.Count;
1035                         List = list;
1036                 }
1037
1038                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1039
1040                 /// <summary>
1041                 ///   Cast the MemberList into a MemberInfo[] array.
1042                 /// </summary>
1043                 /// <remarks>
1044                 ///   This is an expensive operation, only use it if it's really necessary.
1045                 /// </remarks>
1046                 public static explicit operator MemberInfo [] (MemberList list)
1047                 {
1048                         Timer.StartTimer (TimerType.MiscTimer);
1049                         MemberInfo [] result = new MemberInfo [list.Count];
1050                         list.CopyTo (result, 0);
1051                         Timer.StopTimer (TimerType.MiscTimer);
1052                         return result;
1053                 }
1054
1055                 // ICollection
1056
1057                 public int Count {
1058                         get {
1059                                 return count;
1060                         }
1061                 }
1062
1063                 public bool IsSynchronized {
1064                         get {
1065                                 return List.IsSynchronized;
1066                         }
1067                 }
1068
1069                 public object SyncRoot {
1070                         get {
1071                                 return List.SyncRoot;
1072                         }
1073                 }
1074
1075                 public void CopyTo (Array array, int index)
1076                 {
1077                         List.CopyTo (array, index);
1078                 }
1079
1080                 // IEnumerable
1081
1082                 public IEnumerator GetEnumerator ()
1083                 {
1084                         return List.GetEnumerator ();
1085                 }
1086
1087                 // IList
1088
1089                 public bool IsFixedSize {
1090                         get {
1091                                 return true;
1092                         }
1093                 }
1094
1095                 public bool IsReadOnly {
1096                         get {
1097                                 return true;
1098                         }
1099                 }
1100
1101                 object IList.this [int index] {
1102                         get {
1103                                 return List [index];
1104                         }
1105
1106                         set {
1107                                 throw new NotSupportedException ();
1108                         }
1109                 }
1110
1111                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1112                 public MemberInfo this [int index] {
1113                         get {
1114                                 return (MemberInfo) List [index];
1115                         }
1116                 }
1117
1118                 public int Add (object value)
1119                 {
1120                         throw new NotSupportedException ();
1121                 }
1122
1123                 public void Clear ()
1124                 {
1125                         throw new NotSupportedException ();
1126                 }
1127
1128                 public bool Contains (object value)
1129                 {
1130                         return List.Contains (value);
1131                 }
1132
1133                 public int IndexOf (object value)
1134                 {
1135                         return List.IndexOf (value);
1136                 }
1137
1138                 public void Insert (int index, object value)
1139                 {
1140                         throw new NotSupportedException ();
1141                 }
1142
1143                 public void Remove (object value)
1144                 {
1145                         throw new NotSupportedException ();
1146                 }
1147
1148                 public void RemoveAt (int index)
1149                 {
1150                         throw new NotSupportedException ();
1151                 }
1152         }
1153
1154         /// <summary>
1155         ///   This interface is used to get all members of a class when creating the
1156         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1157         ///   want to support the member cache and by TypeHandle to get caching of
1158         ///   non-dynamic types.
1159         /// </summary>
1160         public interface IMemberContainer {
1161                 /// <summary>
1162                 ///   The name of the IMemberContainer.  This is only used for
1163                 ///   debugging purposes.
1164                 /// </summary>
1165                 string Name {
1166                         get;
1167                 }
1168
1169                 /// <summary>
1170                 ///   The type of this IMemberContainer.
1171                 /// </summary>
1172                 Type Type {
1173                         get;
1174                 }
1175
1176                 /// <summary>
1177                 ///   Returns the IMemberContainer of the base class or null if this
1178                 ///   is an interface or TypeManger.object_type.
1179                 ///   This is used when creating the member cache for a class to get all
1180                 ///   members from the base class.
1181                 /// </summary>
1182                 MemberCache BaseCache {
1183                         get;
1184                 }
1185
1186                 /// <summary>
1187                 ///   Whether this is an interface.
1188                 /// </summary>
1189                 bool IsInterface {
1190                         get;
1191                 }
1192
1193                 /// <summary>
1194                 ///   Returns all members of this class with the corresponding MemberTypes
1195                 ///   and BindingFlags.
1196                 /// </summary>
1197                 /// <remarks>
1198                 ///   When implementing this method, make sure not to return any inherited
1199                 ///   members and check the MemberTypes and BindingFlags properly.
1200                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1201                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1202                 ///   MemberInfo class, but the cache needs this information.  That's why
1203                 ///   this method is called multiple times with different BindingFlags.
1204                 /// </remarks>
1205                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1206
1207                 /// <summary>
1208                 ///   Return the container's member cache.
1209                 /// </summary>
1210                 MemberCache MemberCache {
1211                         get;
1212                 }
1213         }
1214
1215         /// <summary>
1216         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1217         ///   member lookups.  It has a member name based hash table; it maps each member
1218         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1219         ///   and the BindingFlags that were initially used to get it.  The cache contains
1220         ///   all members of the current class and all inherited members.  If this cache is
1221         ///   for an interface types, it also contains all inherited members.
1222         ///
1223         ///   There are two ways to get a MemberCache:
1224         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1225         ///     use the DeclSpace.MemberCache property.
1226         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1227         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1228         /// </summary>
1229         public class MemberCache {
1230                 public readonly IMemberContainer Container;
1231                 protected Hashtable member_hash;
1232                 protected Hashtable method_hash;
1233
1234                 /// <summary>
1235                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1236                 /// </summary>
1237                 public MemberCache (IMemberContainer container)
1238                 {
1239                         this.Container = container;
1240
1241                         Timer.IncrementCounter (CounterType.MemberCache);
1242                         Timer.StartTimer (TimerType.CacheInit);
1243
1244                         // If we have a base class (we have a base class unless we're
1245                         // TypeManager.object_type), we deep-copy its MemberCache here.
1246                         if (Container.BaseCache != null)
1247                                 member_hash = SetupCache (Container.BaseCache);
1248                         else
1249                                 member_hash = new Hashtable ();
1250
1251                         // If this is neither a dynamic type nor an interface, create a special
1252                         // method cache with all declared and inherited methods.
1253                         Type type = container.Type;
1254                         if (!(type is TypeBuilder) && !type.IsInterface &&
1255                             (Container.BaseCache == null || Container.BaseCache.method_hash != null)) {
1256                                 method_hash = new Hashtable ();
1257                                 AddMethods (type);
1258                         }
1259
1260                         // Add all members from the current class.
1261                         AddMembers (Container);
1262
1263                         Timer.StopTimer (TimerType.CacheInit);
1264                 }
1265
1266                 public MemberCache (Type[] ifaces)
1267                 {
1268                         //
1269                         // The members of this cache all belong to other caches.
1270                         // So, 'Container' will not be used.
1271                         //
1272                         this.Container = null;
1273
1274                         member_hash = new Hashtable ();
1275                         if (ifaces == null)
1276                                 return;
1277
1278                         foreach (Type itype in ifaces)
1279                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1280                 }
1281
1282                 /// <summary>
1283                 ///   Bootstrap this member cache by doing a deep-copy of our base.
1284                 /// </summary>
1285                 Hashtable SetupCache (MemberCache base_class)
1286                 {
1287                         Hashtable hash = new Hashtable ();
1288
1289                         if (base_class == null)
1290                                 return hash;
1291
1292                         IDictionaryEnumerator it = base_class.member_hash.GetEnumerator ();
1293                         while (it.MoveNext ()) {
1294                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1295                          }
1296
1297                         return hash;
1298                 }
1299
1300                 /// <summary>
1301                 ///   Add the contents of `cache' to the member_hash.
1302                 /// </summary>
1303                 void AddCacheContents (MemberCache cache)
1304                 {
1305                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1306                         while (it.MoveNext ()) {
1307                                 ArrayList list = (ArrayList) member_hash [it.Key];
1308                                 if (list == null)
1309                                         member_hash [it.Key] = list = new ArrayList ();
1310
1311                                 ArrayList entries = (ArrayList) it.Value;
1312                                 for (int i = entries.Count-1; i >= 0; i--) {
1313                                         CacheEntry entry = (CacheEntry) entries [i];
1314
1315                                         if (entry.Container != cache.Container)
1316                                                 break;
1317                                         list.Add (entry);
1318                                 }
1319                         }
1320                 }
1321
1322                 /// <summary>
1323                 ///   Add all members from class `container' to the cache.
1324                 /// </summary>
1325                 void AddMembers (IMemberContainer container)
1326                 {
1327                         // We need to call AddMembers() with a single member type at a time
1328                         // to get the member type part of CacheEntry.EntryType right.
1329                         if (!container.IsInterface) {
1330                                 AddMembers (MemberTypes.Constructor, container);
1331                                 AddMembers (MemberTypes.Field, container);
1332                         }
1333                         AddMembers (MemberTypes.Method, container);
1334                         AddMembers (MemberTypes.Property, container);
1335                         AddMembers (MemberTypes.Event, container);
1336                         // Nested types are returned by both Static and Instance searches.
1337                         AddMembers (MemberTypes.NestedType,
1338                                     BindingFlags.Static | BindingFlags.Public, container);
1339                         AddMembers (MemberTypes.NestedType,
1340                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1341                 }
1342
1343                 void AddMembers (MemberTypes mt, IMemberContainer container)
1344                 {
1345                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1346                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1347                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1348                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1349                 }
1350
1351                 /// <summary>
1352                 ///   Add all members from class `container' with the requested MemberTypes and
1353                 ///   BindingFlags to the cache.  This method is called multiple times with different
1354                 ///   MemberTypes and BindingFlags.
1355                 /// </summary>
1356                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1357                 {
1358                         MemberList members = container.GetMembers (mt, bf);
1359
1360                         foreach (MemberInfo member in members) {
1361                                 string name = member.Name;
1362
1363                                 // We use a name-based hash table of ArrayList's.
1364                                 ArrayList list = (ArrayList) member_hash [name];
1365                                 if (list == null) {
1366                                         list = new ArrayList ();
1367                                         member_hash.Add (name, list);
1368                                 }
1369
1370                                 // When this method is called for the current class, the list will
1371                                 // already contain all inherited members from our base classes.
1372                                 // We cannot add new members in front of the list since this'd be an
1373                                 // expensive operation, that's why the list is sorted in reverse order
1374                                 // (ie. members from the current class are coming last).
1375                                 list.Add (new CacheEntry (container, member, mt, bf));
1376                         }
1377                 }
1378
1379                 /// <summary>
1380                 ///   Add all declared and inherited methods from class `type' to the method cache.
1381                 /// </summary>
1382                 void AddMethods (Type type)
1383                 {
1384                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1385                                     BindingFlags.FlattenHierarchy, type);
1386                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1387                                     BindingFlags.FlattenHierarchy, type);
1388                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1389                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1390                 }
1391
1392                 static ArrayList overrides = new ArrayList ();
1393
1394                 void AddMethods (BindingFlags bf, Type type)
1395                 {
1396                         MethodBase [] members = type.GetMethods (bf);
1397
1398                         Array.Reverse (members);
1399
1400                         foreach (MethodBase member in members) {
1401                                 string name = member.Name;
1402
1403                                 // We use a name-based hash table of ArrayList's.
1404                                 ArrayList list = (ArrayList) method_hash [name];
1405                                 if (list == null) {
1406                                         list = new ArrayList ();
1407                                         method_hash.Add (name, list);
1408                                 }
1409
1410                                 MethodInfo curr = (MethodInfo) member;
1411                                 while (curr.IsVirtual && (curr.Attributes & MethodAttributes.NewSlot) == 0) {
1412                                         MethodInfo base_method = curr.GetBaseDefinition ();
1413
1414                                         if (base_method == curr)
1415                                                 // Not every virtual function needs to have a NewSlot flag.
1416                                                 break;
1417
1418                                         overrides.Add (curr);
1419                                         list.Add (new CacheEntry (null, base_method, MemberTypes.Method, bf));
1420                                         curr = base_method;
1421                                 }
1422
1423                                 if (overrides.Count > 0) {
1424                                         for (int i = 0; i < overrides.Count; ++i)
1425                                                 TypeManager.RegisterOverride ((MethodBase) overrides [i], curr);
1426                                         overrides.Clear ();
1427                                 }
1428
1429                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1430                                 // sorted so we need to do this check for every member.
1431                                 BindingFlags new_bf = bf;
1432                                 if (member.DeclaringType == type)
1433                                         new_bf |= BindingFlags.DeclaredOnly;
1434
1435                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1436                         }
1437                 }
1438
1439                 /// <summary>
1440                 ///   Compute and return a appropriate `EntryType' magic number for the given
1441                 ///   MemberTypes and BindingFlags.
1442                 /// </summary>
1443                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1444                 {
1445                         EntryType type = EntryType.None;
1446
1447                         if ((mt & MemberTypes.Constructor) != 0)
1448                                 type |= EntryType.Constructor;
1449                         if ((mt & MemberTypes.Event) != 0)
1450                                 type |= EntryType.Event;
1451                         if ((mt & MemberTypes.Field) != 0)
1452                                 type |= EntryType.Field;
1453                         if ((mt & MemberTypes.Method) != 0)
1454                                 type |= EntryType.Method;
1455                         if ((mt & MemberTypes.Property) != 0)
1456                                 type |= EntryType.Property;
1457                         // Nested types are returned by static and instance searches.
1458                         if ((mt & MemberTypes.NestedType) != 0)
1459                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1460
1461                         if ((bf & BindingFlags.Instance) != 0)
1462                                 type |= EntryType.Instance;
1463                         if ((bf & BindingFlags.Static) != 0)
1464                                 type |= EntryType.Static;
1465                         if ((bf & BindingFlags.Public) != 0)
1466                                 type |= EntryType.Public;
1467                         if ((bf & BindingFlags.NonPublic) != 0)
1468                                 type |= EntryType.NonPublic;
1469                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1470                                 type |= EntryType.Declared;
1471
1472                         return type;
1473                 }
1474
1475                 /// <summary>
1476                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1477                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1478                 ///   single member types.
1479                 /// </summary>
1480                 public static bool IsSingleMemberType (MemberTypes mt)
1481                 {
1482                         switch (mt) {
1483                         case MemberTypes.Constructor:
1484                         case MemberTypes.Event:
1485                         case MemberTypes.Field:
1486                         case MemberTypes.Method:
1487                         case MemberTypes.Property:
1488                         case MemberTypes.NestedType:
1489                                 return true;
1490
1491                         default:
1492                                 return false;
1493                         }
1494                 }
1495
1496                 /// <summary>
1497                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1498                 ///   number to speed up the searching process.
1499                 /// </summary>
1500                 [Flags]
1501                 protected enum EntryType {
1502                         None            = 0x000,
1503
1504                         Instance        = 0x001,
1505                         Static          = 0x002,
1506                         MaskStatic      = Instance|Static,
1507
1508                         Public          = 0x004,
1509                         NonPublic       = 0x008,
1510                         MaskProtection  = Public|NonPublic,
1511
1512                         Declared        = 0x010,
1513
1514                         Constructor     = 0x020,
1515                         Event           = 0x040,
1516                         Field           = 0x080,
1517                         Method          = 0x100,
1518                         Property        = 0x200,
1519                         NestedType      = 0x400,
1520
1521                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1522                 }
1523
1524                 protected class CacheEntry {
1525                         public readonly IMemberContainer Container;
1526                         public readonly EntryType EntryType;
1527                         public readonly MemberInfo Member;
1528
1529                         public CacheEntry (IMemberContainer container, MemberInfo member,
1530                                            MemberTypes mt, BindingFlags bf)
1531                         {
1532                                 this.Container = container;
1533                                 this.Member = member;
1534                                 this.EntryType = GetEntryType (mt, bf);
1535                         }
1536
1537                         public override string ToString ()
1538                         {
1539                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1540                                                       EntryType, Member);
1541                         }
1542                 }
1543
1544                 /// <summary>
1545                 ///   This is called each time we're walking up one level in the class hierarchy
1546                 ///   and checks whether we can abort the search since we've already found what
1547                 ///   we were looking for.
1548                 /// </summary>
1549                 protected bool DoneSearching (ArrayList list)
1550                 {
1551                         //
1552                         // We've found exactly one member in the current class and it's not
1553                         // a method or constructor.
1554                         //
1555                         if (list.Count == 1 && !(list [0] is MethodBase))
1556                                 return true;
1557
1558                         //
1559                         // Multiple properties: we query those just to find out the indexer
1560                         // name
1561                         //
1562                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1563                                 return true;
1564
1565                         return false;
1566                 }
1567
1568                 /// <summary>
1569                 ///   Looks up members with name `name'.  If you provide an optional
1570                 ///   filter function, it'll only be called with members matching the
1571                 ///   requested member name.
1572                 ///
1573                 ///   This method will try to use the cache to do the lookup if possible.
1574                 ///
1575                 ///   Unlike other FindMembers implementations, this method will always
1576                 ///   check all inherited members - even when called on an interface type.
1577                 ///
1578                 ///   If you know that you're only looking for methods, you should use
1579                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1580                 ///   When doing a method-only search, it'll try to use a special method
1581                 ///   cache (unless it's a dynamic type or an interface) and the returned
1582                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1583                 ///   The lookup process will automatically restart itself in method-only
1584                 ///   search mode if it discovers that it's about to return methods.
1585                 /// </summary>
1586                 ArrayList global = new ArrayList ();
1587                 bool using_global = false;
1588
1589                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1590
1591                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1592                                                   MemberFilter filter, object criteria)
1593                 {
1594                         if (using_global)
1595                                 throw new Exception ();
1596
1597                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1598                         bool method_search = mt == MemberTypes.Method;
1599                         // If we have a method cache and we aren't already doing a method-only search,
1600                         // then we restart a method search if the first match is a method.
1601                         bool do_method_search = !method_search && (method_hash != null);
1602
1603                         ArrayList applicable;
1604
1605                         // If this is a method-only search, we try to use the method cache if
1606                         // possible; a lookup in the method cache will return a MemberInfo with
1607                         // the correct ReflectedType for inherited methods.
1608
1609                         if (method_search && (method_hash != null))
1610                                 applicable = (ArrayList) method_hash [name];
1611                         else
1612                                 applicable = (ArrayList) member_hash [name];
1613
1614                         if (applicable == null)
1615                                 return emptyMemberInfo;
1616
1617                         //
1618                         // 32  slots gives 53 rss/54 size
1619                         // 2/4 slots gives 55 rss
1620                         //
1621                         // Strange: from 25,000 calls, only 1,800
1622                         // are above 2.  Why does this impact it?
1623                         //
1624                         global.Clear ();
1625                         using_global = true;
1626
1627                         Timer.StartTimer (TimerType.CachedLookup);
1628
1629                         EntryType type = GetEntryType (mt, bf);
1630
1631                         IMemberContainer current = Container;
1632
1633
1634                         // `applicable' is a list of all members with the given member name `name'
1635                         // in the current class and all its base classes.  The list is sorted in
1636                         // reverse order due to the way how the cache is initialy created (to speed
1637                         // things up, we're doing a deep-copy of our base).
1638
1639                         for (int i = applicable.Count-1; i >= 0; i--) {
1640                                 CacheEntry entry = (CacheEntry) applicable [i];
1641
1642                                 // This happens each time we're walking one level up in the class
1643                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
1644                                 // the first time this happens (this may already happen in the first
1645                                 // iteration of this loop if there are no members with the name we're
1646                                 // looking for in the current class).
1647                                 if (entry.Container != current) {
1648                                         if (declared_only || DoneSearching (global))
1649                                                 break;
1650
1651                                         current = entry.Container;
1652                                 }
1653
1654                                 // Is the member of the correct type ?
1655                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
1656                                         continue;
1657
1658                                 // Is the member static/non-static ?
1659                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
1660                                         continue;
1661
1662                                 // Apply the filter to it.
1663                                 if (filter (entry.Member, criteria)) {
1664                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
1665                                                 do_method_search = false;
1666                                         global.Add (entry.Member);
1667                                 }
1668                         }
1669
1670                         Timer.StopTimer (TimerType.CachedLookup);
1671
1672                         // If we have a method cache and we aren't already doing a method-only
1673                         // search, we restart in method-only search mode if the first match is
1674                         // a method.  This ensures that we return a MemberInfo with the correct
1675                         // ReflectedType for inherited methods.
1676                         if (do_method_search && (global.Count > 0)){
1677                                 using_global = false;
1678
1679                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
1680                         }
1681
1682                         using_global = false;
1683                         MemberInfo [] copy = new MemberInfo [global.Count];
1684                         global.CopyTo (copy);
1685                         return copy;
1686                 }
1687
1688                 // find the nested type @name in @this.
1689                 public Type FindNestedType (string name)
1690                 {
1691                         ArrayList applicable = (ArrayList) member_hash [name];
1692                         if (applicable == null)
1693                                 return null;
1694
1695                         for (int i = applicable.Count-1; i >= 0; i--) {
1696                                 CacheEntry entry = (CacheEntry) applicable [i];
1697                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
1698                                         return (Type) entry.Member;
1699                         }
1700
1701                         return null;
1702                 }
1703
1704                 //
1705                 // This finds the method or property for us to override. invocationType is the type where
1706                 // the override is going to be declared, name is the name of the method/property, and
1707                 // paramTypes is the parameters, if any to the method or property
1708                 //
1709                 // Because the MemberCache holds members from this class and all the base classes,
1710                 // we can avoid tons of reflection stuff.
1711                 //
1712                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
1713                 {
1714                         ArrayList applicable;
1715                         if (method_hash != null && !is_property)
1716                                 applicable = (ArrayList) method_hash [name];
1717                         else
1718                                 applicable = (ArrayList) member_hash [name];
1719
1720                         if (applicable == null)
1721                                 return null;
1722                         //
1723                         // Walk the chain of methods, starting from the top.
1724                         //
1725                         for (int i = applicable.Count - 1; i >= 0; i--) {
1726                                 CacheEntry entry = (CacheEntry) applicable [i];
1727
1728                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
1729                                         continue;
1730
1731                                 PropertyInfo pi = null;
1732                                 MethodInfo mi = null;
1733                                 FieldInfo fi = null;
1734                                 Type [] cmpAttrs = null;
1735
1736                                 if (is_property) {
1737                                         if ((entry.EntryType & EntryType.Field) != 0) {
1738                                                 fi = (FieldInfo)entry.Member;
1739
1740                                                 // TODO: For this case we ignore member type
1741                                                 //fb = TypeManager.GetField (fi);
1742                                                 //cmpAttrs = new Type[] { fb.MemberType };
1743                                         } else {
1744                                                 pi = (PropertyInfo) entry.Member;
1745                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
1746                                         }
1747                                 } else {
1748                                         mi = (MethodInfo) entry.Member;
1749                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
1750                                 }
1751
1752                                 if (fi != null) {
1753                                         // TODO: Almost duplicate !
1754                                         // Check visibility
1755                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
1756                                                 case FieldAttributes.Private:
1757                                                         //
1758                                                         // A private method is Ok if we are a nested subtype.
1759                                                         // The spec actually is not very clear about this, see bug 52458.
1760                                                         //
1761                                                         if (invocationType != entry.Container.Type &
1762                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1763                                                                 continue;
1764
1765                                                         break;
1766                                                 case FieldAttributes.FamANDAssem:
1767                                                 case FieldAttributes.Assembly:
1768                                                         //
1769                                                         // Check for assembly methods
1770                                                         //
1771                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
1772                                                                 continue;
1773                                                         break;
1774                                         }
1775                                         return entry.Member;
1776                                 }
1777
1778                                 //
1779                                 // Check the arguments
1780                                 //
1781                                 if (cmpAttrs.Length != paramTypes.Length)
1782                                         continue;
1783
1784                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --)
1785                                         if (paramTypes [j] != cmpAttrs [j])
1786                                                 goto next;
1787
1788                                 //
1789                                 // get one of the methods because this has the visibility info.
1790                                 //
1791                                 if (is_property) {
1792                                         mi = pi.GetGetMethod (true);
1793                                         if (mi == null)
1794                                                 mi = pi.GetSetMethod (true);
1795                                 }
1796
1797                                 //
1798                                 // Check visibility
1799                                 //
1800                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
1801                                 case MethodAttributes.Private:
1802                                         //
1803                                         // A private method is Ok if we are a nested subtype.
1804                                         // The spec actually is not very clear about this, see bug 52458.
1805                                         //
1806                                         if (invocationType == entry.Container.Type ||
1807                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1808                                                 return entry.Member;
1809
1810                                         break;
1811                                 case MethodAttributes.FamANDAssem:
1812                                 case MethodAttributes.Assembly:
1813                                         //
1814                                         // Check for assembly methods
1815                                         //
1816                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
1817                                                 return entry.Member;
1818
1819                                         break;
1820                                 default:
1821                                         //
1822                                         // A protected method is ok, because we are overriding.
1823                                         // public is always ok.
1824                                         //
1825                                         return entry.Member;
1826                                 }
1827                         next:
1828                                 ;
1829                         }
1830
1831                         return null;
1832                 }
1833
1834                 /// <summary>
1835                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
1836                 /// We handle two cases. The first is for types without parameters (events, field, properties).
1837                 /// The second are methods, indexers and this is why ignore_complex_types is here.
1838                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
1839                 /// </summary>
1840                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
1841                 {
1842                         ArrayList applicable = null;
1843
1844                         if (method_hash != null)
1845                                 applicable = (ArrayList) method_hash [name];
1846
1847                         if (applicable != null) {
1848                                 for (int i = applicable.Count - 1; i >= 0; i--) {
1849                                         CacheEntry entry = (CacheEntry) applicable [i];
1850                                         if ((entry.EntryType & EntryType.Public) != 0)
1851                                                 return entry.Member;
1852                                 }
1853                         }
1854
1855                         if (member_hash == null)
1856                                 return null;
1857                         applicable = (ArrayList) member_hash [name];
1858
1859                         if (applicable != null) {
1860                                 for (int i = applicable.Count - 1; i >= 0; i--) {
1861                                         CacheEntry entry = (CacheEntry) applicable [i];
1862                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
1863                                                 if (ignore_complex_types) {
1864                                                         if ((entry.EntryType & EntryType.Method) != 0)
1865                                                                 continue;
1866
1867                                                         // Does exist easier way how to detect indexer ?
1868                                                         if ((entry.EntryType & EntryType.Property) != 0) {
1869                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
1870                                                                 if (arg_types.Length > 0)
1871                                                                         continue;
1872                                                         }
1873                                                 }
1874                                                 return entry.Member;
1875                                         }
1876                                 }
1877                         }
1878                         return null;
1879                 }
1880
1881                 Hashtable locase_table;
1882
1883                 /// <summary>
1884                 /// Builds low-case table for CLS Compliance test
1885                 /// </summary>
1886                 public Hashtable GetPublicMembers ()
1887                 {
1888                         if (locase_table != null)
1889                                 return locase_table;
1890
1891                         locase_table = new Hashtable ();
1892                         foreach (DictionaryEntry entry in member_hash) {
1893                                 ArrayList members = (ArrayList)entry.Value;
1894                                 for (int ii = 0; ii < members.Count; ++ii) {
1895                                         CacheEntry member_entry = (CacheEntry) members [ii];
1896
1897                                         if ((member_entry.EntryType & EntryType.Public) == 0)
1898                                                 continue;
1899
1900                                         // TODO: Does anyone know easier way how to detect that member is internal ?
1901                                         switch (member_entry.EntryType & EntryType.MaskType) {
1902                                                 case EntryType.Constructor:
1903                                                         continue;
1904
1905                                                 case EntryType.Field:
1906                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
1907                                                                 continue;
1908                                                         break;
1909
1910                                                 case EntryType.Method:
1911                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
1912                                                                 continue;
1913                                                         break;
1914
1915                                                 case EntryType.Property:
1916                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
1917                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
1918                                                                 continue;
1919                                                         break;
1920
1921                                                 case EntryType.Event:
1922                                                         EventInfo ei = (EventInfo)member_entry.Member;
1923                                                         MethodInfo mi = ei.GetAddMethod ();
1924                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
1925                                                                 continue;
1926                                                         break;
1927                                         }
1928                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
1929                                         locase_table [lcase] = member_entry.Member;
1930                                         break;
1931                                 }
1932                         }
1933                         return locase_table;
1934                 }
1935
1936                 public Hashtable Members {
1937                         get {
1938                                 return member_hash;
1939                         }
1940                 }
1941
1942                 /// <summary>
1943                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
1944                 /// </summary>
1945                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
1946                 {
1947                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
1948
1949                         for (int i = 0; i < al.Count; ++i) {
1950                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
1951
1952                                 // skip itself
1953                                 if (entry.Member == this_builder)
1954                                         continue;
1955
1956                                 if ((entry.EntryType & tested_type) != tested_type)
1957                                         continue;
1958
1959                                 MethodBase method_to_compare = (MethodBase)entry.Member;
1960                                 AttributeTester.Result result = AttributeTester.AreOverloadedMethodParamsClsCompliant (
1961                                         method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare));
1962
1963                                 if (result == AttributeTester.Result.Ok)
1964                                         continue;
1965
1966                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
1967
1968                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
1969                                 // However it is exactly what csc does.
1970                                 if (md != null && !md.IsClsCompliaceRequired (method.Parent))
1971                                         continue;
1972
1973                                 Report.SymbolRelatedToPreviousError (entry.Member);
1974                                 switch (result) {
1975                                         case AttributeTester.Result.RefOutArrayError:
1976                                                 Report.Error (3006, method.Location, "Overloaded method '{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
1977                                                 continue;
1978                                         case AttributeTester.Result.ArrayArrayError:
1979                                                 Report.Error (3007, method.Location, "Overloaded method '{0}' differing only by unnamed array types is not CLS-compliant", method.GetSignatureForError ());
1980                                                 continue;
1981                                 }
1982
1983                                 throw new NotImplementedException (result.ToString ());
1984                         }
1985                 }
1986         }
1987 }