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 //
  11 // TODO: Move the method verification stuff from the class.cs and interface.cs here
  12 //
  13
  14 using System;
  15 using System.Collections;
  16 using System.Globalization;
  17 using System.Reflection.Emit;
  18 using System.Reflection;
  19
  20 namespace Mono.CSharp {
  21
  22         public class MemberName {
  23                 public string Name;
  24                 public readonly MemberName Left;
  25
  26                 public static readonly MemberName Null = new MemberName ("");
  27
  28                 public MemberName (string name)
  29                 {
  30                         this.Name = name;
  31                 }
  32
  33                 public MemberName (MemberName left, string name)
  34                         : this (name)
  35                 {
  36                         this.Left = left;
  37                 }
  38
  39                 public MemberName (MemberName left, MemberName right)
  40                         : this (left, right.Name)
  41                 {
  42                 }
  43
  44                 public string GetName ()
  45                 {
  46                         return GetName (false);
  47                 }
  48
  49                 public string GetName (bool is_generic)
  50                 {
  51                         string name = is_generic ? Basename : Name;
  52                         if (Left != null)
  53                                 return Left.GetName (is_generic) + "." + name;
  54                         else
  55                                 return name;
  56                 }
  57
  58                 ///
  59                 /// This returns exclusively the name as seen on the source code
  60                 /// it is not the fully qualifed type after resolution
  61                 ///
  62                 public string GetPartialName ()
  63                 {
  64                         if (Left != null)
  65                                 return Left.GetPartialName () + "." + Name;
  66                         else
  67                                 return Name;
  68                 }
  69
  70                 public string GetTypeName ()
  71                 {
  72                         if (Left != null)
  73                                 return Left.GetTypeName () + "." + Name;
  74                         else
  75                                 return Name;
  76                 }
  77
  78                 public Expression GetTypeExpression (Location loc)
  79                 {
  80                         if (Left != null) {
  81                                 Expression lexpr = Left.GetTypeExpression (loc);
  82
  83                                 return new MemberAccess (lexpr, Name, loc);
  84                         } else {
  85                                 return new SimpleName (Name, loc);
  86                         }
  87                 }
  88
  89                 public MemberName Clone ()
  90                 {
  91                         if (Left != null)
  92                                 return new MemberName (Left.Clone (), Name);
  93                         else
  94                                 return new MemberName (Name);
  95                 }
  96
  97                 public string Basename {
  98                         get {
  99                                 return Name;
 100                         }
 101                 }
 102
 103                 public override string ToString ()
 104                 {
 105                         Console.WriteLine ("INTERNAL-WARNING: someone is miss-using MemberName.ToString in the compiler.  Please report this bug");
 106                         Console.WriteLine ("From: " + Environment.StackTrace);
 107                         return Name;
 108                 }
 109         }
 110
 111         /// <summary>
 112         ///   Base representation for members.  This is used to keep track
 113         ///   of Name, Location and Modifier flags, and handling Attributes.
 114         /// </summary>
 115         public abstract class MemberCore : Attributable {
 116                 /// <summary>
 117                 ///   Public name
 118                 /// </summary>
 119                 public string Name {
 120                         get {
 121                                 // !(this is GenericMethod) && !(this is Method)
 122                                 return MemberName.GetName (false);
 123                         }
 124                 }
 125 \r
 126                 // Is not readonly because of IndexerName attribute
 127                 public MemberName MemberName;
 128
 129                 /// <summary>
 130                 ///   Modifier flags that the user specified in the source code
 131                 /// </summary>
 132                 public int ModFlags;
 133
 134                 public readonly TypeContainer Parent;
 135
 136                 /// <summary>
 137                 ///   Location where this declaration happens
 138                 /// </summary>
 139                 public readonly Location Location;
 140
 141                 [Flags]
 142                 public enum Flags {
 143                         Obsolete_Undetected = 1,                // Obsolete attribute has not been detected yet
 144                         Obsolete = 1 << 1,                      // Type has obsolete attribute
 145                         ClsCompliance_Undetected = 1 << 2,      // CLS Compliance has not been detected yet
 146                         ClsCompliant = 1 << 3,                  // Type is CLS Compliant
 147                         CloseTypeCreated = 1 << 4,              // Tracks whether we have Closed the type
 148                         HasCompliantAttribute_Undetected = 1 << 5,      // Presence of CLSCompliantAttribute has not been detected
 149                         HasClsCompliantAttribute = 1 << 6,                      // Type has CLSCompliantAttribute
 150                         ClsCompliantAttributeTrue = 1 << 7,                     // Type has CLSCompliant (true)
 151                         Excluded_Undetected = 1 << 8,           // Conditional attribute has not been detected yet
 152                         Excluded = 1 << 9,                                      // Method is conditional
 153                         TestMethodDuplication = 1 << 10         // Test for duplication must be performed
 154                 }
 155
 156                 /// <summary>
 157                 ///   MemberCore flags at first detected then cached
 158                 /// </summary>
 159                 internal Flags caching_flags;
 160
 161                 public MemberCore (TypeContainer parent, MemberName name, Attributes attrs,
 162                                    Location loc)
 163                         : base (attrs)
 164                 {
 165                         Parent = parent;
 166                         MemberName = name;
 167                         Location = loc;
 168                         caching_flags = Flags.Obsolete_Undetected | Flags.ClsCompliance_Undetected | Flags.HasCompliantAttribute_Undetected | Flags.Excluded_Undetected;
 169                 }
 170
 171                 /// <summary>
 172                 /// Tests presence of ObsoleteAttribute and report proper error
 173                 /// </summary>
 174                 protected void CheckUsageOfObsoleteAttribute (Type type)
 175                 {
 176                         if (type == null)
 177                                 return;
 178
 179                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (type);
 180                         if (obsolete_attr == null)
 181                                 return;
 182
 183                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, type.FullName, Location);
 184                 }
 185
 186                 public abstract bool Define ();
 187
 188                 //
 189                 // Returns full member name for error message
 190                 //
 191                 public virtual string GetSignatureForError ()
 192                 {
 193                         return Name;
 194                 }
 195
 196                 /// <summary>
 197                 /// Use this method when MethodBuilder is null
 198                 /// </summary>
 199                 public virtual string GetSignatureForError (TypeContainer tc)
 200                 {
 201                         return Name;
 202                 }
 203
 204                 /// <summary>
 205                 /// Base Emit method. This is also entry point for CLS-Compliant verification.
 206                 /// </summary>
 207                 public virtual void Emit ()
 208                 {
 209                         // Hack with Parent == null is for EnumMember
 210                         if (Parent == null || (GetObsoleteAttribute (Parent) == null && Parent.GetObsoleteAttribute (Parent) == null))
 211                                 VerifyObsoleteAttribute ();
 212
 213                         if (!RootContext.VerifyClsCompliance)
 214                                 return;
 215
 216                         VerifyClsCompliance (Parent);
 217                 }
 218
 219                 public bool InUnsafe {
 220                         get {
 221                                 return ((ModFlags & Modifiers.UNSAFE) != 0) || Parent.UnsafeContext;
 222                         }
 223                 }
 224
 225                 //
 226                 // Whehter is it ok to use an unsafe pointer in this type container
 227                 //
 228                 public bool UnsafeOK (DeclSpace parent)
 229                 {
 230                         //
 231                         // First check if this MemberCore modifier flags has unsafe set
 232                         //
 233                         if ((ModFlags & Modifiers.UNSAFE) != 0)
 234                                 return true;
 235
 236                         if (parent.UnsafeContext)
 237                                 return true;
 238
 239                         Expression.UnsafeError (Location);
 240                         return false;
 241                 }
 242
 243                 /// <summary>
 244                 /// Returns instance of ObsoleteAttribute for this MemberCore
 245                 /// </summary>
 246                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 247                 {
 248                         // ((flags & (Flags.Obsolete_Undetected | Flags.Obsolete)) == 0) is slower, but why ?
 249                         if ((caching_flags & Flags.Obsolete_Undetected) == 0 && (caching_flags & Flags.Obsolete) == 0) {
 250                                 return null;
 251                         }
 252
 253                         caching_flags &= ~Flags.Obsolete_Undetected;
 254
 255                         if (OptAttributes == null)
 256                                 return null;
 257
 258                         // TODO: remove this allocation
 259                         EmitContext ec = new EmitContext (ds.Parent, ds, ds.Location,
 260                                 null, null, ds.ModFlags, false);
 261
 262                         Attribute obsolete_attr = OptAttributes.Search (TypeManager.obsolete_attribute_type, ec);
 263                         if (obsolete_attr == null)
 264                                 return null;
 265
 266                         ObsoleteAttribute obsolete = obsolete_attr.GetObsoleteAttribute (ds);
 267                         if (obsolete == null)
 268                                 return null;
 269
 270                         caching_flags |= Flags.Obsolete;
 271                         return obsolete;
 272                 }
 273
 274                 /// <summary>
 275                 /// Analyze whether CLS-Compliant verification must be execute for this MemberCore.
 276                 /// </summary>
 277                 public override bool IsClsCompliaceRequired (DeclSpace container)
 278                 {
 279                         if ((caching_flags & Flags.ClsCompliance_Undetected) == 0)
 280                                 return (caching_flags & Flags.ClsCompliant) != 0;
 281
 282                         if (GetClsCompliantAttributeValue (container) && IsExposedFromAssembly (container)) {
 283                                 caching_flags &= ~Flags.ClsCompliance_Undetected;
 284                                 caching_flags |= Flags.ClsCompliant;
 285                                 return true;
 286                         }
 287
 288                         caching_flags &= ~Flags.ClsCompliance_Undetected;
 289                         return false;
 290                 }
 291
 292                 /// <summary>
 293                 /// Returns true when MemberCore is exposed from assembly.
 294                 /// </summary>
 295                 protected bool IsExposedFromAssembly (DeclSpace ds)
 296                 {
 297                         if ((ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 298                                 return false;
 299
 300                         DeclSpace parentContainer = ds;
 301                         while (parentContainer != null && parentContainer.ModFlags != 0) {
 302                                 if ((parentContainer.ModFlags & (Modifiers.PUBLIC | Modifiers.PROTECTED)) == 0)
 303                                         return false;
 304                                 parentContainer = parentContainer.Parent;
 305                         }
 306                         return true;
 307                 }
 308
 309                 /// <summary>
 310                 /// Resolve CLSCompliantAttribute value or gets cached value.
 311                 /// </summary>
 312                 bool GetClsCompliantAttributeValue (DeclSpace ds)
 313                 {
 314                         if (OptAttributes != null) {
 315                                 EmitContext ec = new EmitContext (ds.Parent, ds, ds.Location,
 316                                                                   null, null, ds.ModFlags, false);
 317                                 Attribute cls_attribute = OptAttributes.GetClsCompliantAttribute (ec);
 318                                 if (cls_attribute != null) {
 319                                         caching_flags |= Flags.HasClsCompliantAttribute;
 320                                         return cls_attribute.GetClsCompliantAttributeValue (ds);
 321                                 }
 322                         }
 323                         return ds.GetClsCompliantAttributeValue ();
 324                 }
 325
 326                 /// <summary>
 327                 /// Returns true if MemberCore is explicitly marked with CLSCompliantAttribute
 328                 /// </summary>
 329                 protected bool HasClsCompliantAttribute {
 330                         get {
 331                                 return (caching_flags & Flags.HasClsCompliantAttribute) != 0;
 332                         }
 333                 }
 334
 335
 336                 /// <summary>
 337                 /// The main virtual method for CLS-Compliant verifications.
 338                 /// The method returns true if member is CLS-Compliant and false if member is not
 339                 /// CLS-Compliant which means that CLS-Compliant tests are not necessary. A descendants override it
 340                 /// and add their extra verifications.
 341                 /// </summary>
 342                 protected virtual bool VerifyClsCompliance (DeclSpace ds)
 343                 {
 344                         if (!IsClsCompliaceRequired (ds)) {
 345                                 if ((RootContext.WarningLevel >= 2) && HasClsCompliantAttribute && !IsExposedFromAssembly (ds)) {
 346                                         Report.Warning (3019, Location, "CLS compliance checking will not be performed on '{0}' because it is private or internal", GetSignatureForError ());
 347                                 }
 348                                 return false;
 349                         }
 350
 351                         if (!CodeGen.Assembly.IsClsCompliant) {
 352                                 if (HasClsCompliantAttribute) {
 353                                         Report.Error (3014, Location, "'{0}' cannot be marked as CLS-compliant because the assembly does not have a CLSCompliant attribute", GetSignatureForError ());
 354                                 }
 355                                 return false;
 356                         }
 357
 358                         int index = Name.LastIndexOf ('.');
 359                         if (Name [index > 0 ? index + 1 : 0] == '_') {
 360                                 Report.Error (3008, Location, "Identifier '{0}' is not CLS-compliant", GetSignatureForError () );
 361                         }
 362                         return true;
 363                 }
 364
 365                 protected abstract void VerifyObsoleteAttribute ();
 366
 367         }
 368
 369         /// <summary>
 370         ///   Base class for structs, classes, enumerations and interfaces.
 371         /// </summary>
 372         /// <remarks>
 373         ///   They all create new declaration spaces.  This
 374         ///   provides the common foundation for managing those name
 375         ///   spaces.
 376         /// </remarks>
 377         public abstract class DeclSpace : MemberCore {
 378                 /// <summary>
 379                 ///   this points to the actual definition that is being
 380                 ///   created with System.Reflection.Emit
 381                 /// </summary>
 382                 public TypeBuilder TypeBuilder;
 383
 384                 //
 385                 // This is the namespace in which this typecontainer
 386                 // was declared.  We use this to resolve names.
 387                 //
 388                 public NamespaceEntry NamespaceEntry;
 389
 390                 public Hashtable Cache = new Hashtable ();
 391
 392                 public string Basename;
 393
 394                 protected Hashtable defined_names;
 395
 396                 static string[] attribute_targets = new string [] { "type" };
 397
 398                 public DeclSpace (NamespaceEntry ns, TypeContainer parent, MemberName name,
 399                                   Attributes attrs, Location l)
 400                         : base (parent, name, attrs, l)
 401                 {
 402                         NamespaceEntry = ns;
 403                         Basename = name.Name;
 404                         defined_names = new Hashtable ();
 405                 }
 406
 407                 /// <summary>
 408                 /// Adds the member to defined_names table. It tests for duplications and enclosing name conflicts
 409                 /// </summary>
 410                 protected bool AddToContainer (MemberCore symbol, bool is_method, string fullname, string basename)
 411                 {
 412                         if (basename == Basename && !(this is Interface)) {
 413                                 Report.SymbolRelatedToPreviousError (this);
 414                                 Report.Error (542, "'{0}': member names cannot be the same as their enclosing type", symbol.Location, symbol.GetSignatureForError ());
 415                                 return false;
 416                         }
 417
 418                         MemberCore mc = (MemberCore)defined_names [fullname];
 419
 420                         if (is_method && (mc is MethodCore || mc is IMethodData)) {
 421                                 symbol.caching_flags |= Flags.TestMethodDuplication;
 422                                 mc.caching_flags |= Flags.TestMethodDuplication;
 423                                 return true;
 424                         }
 425
 426                         if (mc != null) {
 427                                 Report.SymbolRelatedToPreviousError (mc);
 428                                 Report.Error (102, symbol.Location, "The type '{0}' already contains a definition for '{1}'", GetSignatureForError (), basename);
 429                                 return false;
 430                         }
 431
 432                         defined_names.Add (fullname, symbol);
 433                         return true;
 434                 }
 435
 436                 public void RecordDecl ()
 437                 {
 438                         if ((NamespaceEntry != null) && (Parent == RootContext.Tree.Types))
 439                                 NamespaceEntry.DefineName (MemberName.Basename, this);
 440                 }
 441
 442                 /// <summary>
 443                 ///   Returns the MemberCore associated with a given name in the declaration
 444                 ///   space. It doesn't return method based symbols !!
 445                 /// </summary>
 446                 ///
 447                 public MemberCore GetDefinition (string name)
 448                 {
 449                         return (MemberCore)defined_names [name];
 450                 }
 451
 452                 bool in_transit = false;
 453
 454                 /// <summary>
 455                 ///   This function is used to catch recursive definitions
 456                 ///   in declarations.
 457                 /// </summary>
 458                 public bool InTransit {
 459                         get {
 460                                 return in_transit;
 461                         }
 462
 463                         set {
 464                                 in_transit = value;
 465                         }
 466                 }
 467
 468                 /// <summary>
 469                 ///   Looks up the alias for the name
 470                 /// </summary>
 471                 public string LookupAlias (string name)
 472                 {
 473                         if (NamespaceEntry != null)
 474                                 return NamespaceEntry.LookupAlias (name);
 475                         else
 476                                 return null;
 477                 }
 478
 479                 //
 480                 // root_types contains all the types.  All TopLevel types
 481                 // hence have a parent that points to `root_types', that is
 482                 // why there is a non-obvious test down here.
 483                 //
 484                 public bool IsTopLevel {
 485                         get {
 486                                 if (Parent != null){
 487                                         if (Parent.Parent == null)
 488                                                 return true;
 489                                 }
 490                                 return false;
 491                         }
 492                 }
 493
 494                 public virtual void CloseType ()
 495                 {
 496                         if ((caching_flags & Flags.CloseTypeCreated) == 0){
 497                                 try {
 498                                         TypeBuilder.CreateType ();
 499                                 } catch {
 500                                         //
 501                                         // The try/catch is needed because
 502                                         // nested enumerations fail to load when they
 503                                         // are defined.
 504                                         //
 505                                         // Even if this is the right order (enumerations
 506                                         // declared after types).
 507                                         //
 508                                         // Note that this still creates the type and
 509                                         // it is possible to save it
 510                                 }
 511                                 caching_flags |= Flags.CloseTypeCreated;
 512                         }
 513                 }
 514
 515                 /// <remarks>
 516                 ///  Should be overriten by the appropriate declaration space
 517                 /// </remarks>
 518                 public abstract TypeBuilder DefineType ();
 519
 520                 /// <summary>
 521                 ///   Define all members, but don't apply any attributes or do anything which may
 522                 ///   access not-yet-defined classes.  This method also creates the MemberCache.
 523                 /// </summary>
 524                 public abstract bool DefineMembers (TypeContainer parent);
 525
 526                 //
 527                 // Whether this is an `unsafe context'
 528                 //
 529                 public bool UnsafeContext {
 530                         get {
 531                                 if ((ModFlags & Modifiers.UNSAFE) != 0)
 532                                         return true;
 533                                 if (Parent != null)
 534                                         return Parent.UnsafeContext;
 535                                 return false;
 536                         }
 537                 }
 538
 539                 public static string MakeFQN (string nsn, string name)
 540                 {
 541                         if (nsn == "")
 542                                 return name;
 543                         return String.Concat (nsn, ".", name);
 544                 }
 545
 546                 EmitContext type_resolve_ec;
 547                 EmitContext GetTypeResolveEmitContext (TypeContainer parent, Location loc)
 548                 {
 549                         type_resolve_ec = new EmitContext (parent, this, loc, null, null, ModFlags, false);
 550                         type_resolve_ec.ResolvingTypeTree = true;
 551
 552                         return type_resolve_ec;
 553                 }
 554
 555                 // <summary>
 556                 //    Looks up the type, as parsed into the expression `e'.
 557                 // </summary>
 558                 //[Obsolete ("This method is going away soon")]
 559                 public Type ResolveType (Expression e, bool silent, Location loc)
 560                 {
 561                         TypeExpr d = ResolveTypeExpr (e, silent, loc);
 562                         return d == null ? null : d.Type;
 563                 }
 564
 565                 // <summary>
 566                 //    Resolves the expression `e' for a type, and will recursively define
 567                 //    types.  This should only be used for resolving base types.
 568                 // </summary>
 569                 public TypeExpr ResolveTypeExpr (Expression e, bool silent, Location loc)
 570                 {
 571                         if (type_resolve_ec == null)
 572                                 type_resolve_ec = GetTypeResolveEmitContext (Parent, loc);
 573                         type_resolve_ec.loc = loc;
 574                         type_resolve_ec.ContainerType = TypeBuilder;
 575
 576                         return e.ResolveAsTypeTerminal (type_resolve_ec, silent);
 577                 }
 578
 579                 public bool CheckAccessLevel (Type check_type)
 580                 {
 581                         if (check_type == TypeBuilder)
 582                                 return true;
 583
 584                         TypeAttributes check_attr = check_type.Attributes & TypeAttributes.VisibilityMask;
 585
 586                         //
 587                         // Broken Microsoft runtime, return public for arrays, no matter what
 588                         // the accessibility is for their underlying class, and they return
 589                         // NonPublic visibility for pointers
 590                         //
 591                         if (check_type.IsArray || check_type.IsPointer)
 592                                 return CheckAccessLevel (TypeManager.GetElementType (check_type));
 593
 594                         if (TypeBuilder == null)
 595                                 // FIXME: TypeBuilder will be null when invoked by Class.GetNormalBases().
 596                                 //        However, this is invoked again later -- so safe to return true.
 597                                 //        May also be null when resolving top-level attributes.
 598                                 return true;
 599
 600                         switch (check_attr){
 601                         case TypeAttributes.Public:
 602                                 return true;
 603
 604                         case TypeAttributes.NotPublic:
 605                                 //
 606                                 // This test should probably use the declaringtype.
 607                                 //
 608                                 return check_type.Assembly == TypeBuilder.Assembly;
 609
 610                         case TypeAttributes.NestedPublic:
 611                                 return true;
 612
 613                         case TypeAttributes.NestedPrivate:
 614                                 return NestedAccessible (check_type);
 615
 616                         case TypeAttributes.NestedFamily:
 617                                 return FamilyAccessible (check_type);
 618
 619                         case TypeAttributes.NestedFamANDAssem:
 620                                 return (check_type.Assembly == TypeBuilder.Assembly) &&
 621                                         FamilyAccessible (check_type);
 622
 623                         case TypeAttributes.NestedFamORAssem:
 624                                 return (check_type.Assembly == TypeBuilder.Assembly) ||
 625                                         FamilyAccessible (check_type);
 626
 627                         case TypeAttributes.NestedAssembly:
 628                                 return check_type.Assembly == TypeBuilder.Assembly;
 629                         }
 630
 631                         Console.WriteLine ("HERE: " + check_attr);
 632                         return false;
 633
 634                 }
 635
 636                 protected bool NestedAccessible (Type check_type)
 637                 {
 638                         string check_type_name = check_type.FullName;
 639
 640                         // At this point, we already know check_type is a nested class.
 641                         int cio = check_type_name.LastIndexOf ('+');
 642
 643                         // Ensure that the string 'container' has a '+' in it to avoid false matches
 644                         string container = check_type_name.Substring (0, cio + 1);
 645
 646                         // Ensure that type_name ends with a '+' so that it can match 'container', if necessary
 647                         string type_name = TypeBuilder.FullName + "+";
 648
 649                         // If the current class is nested inside the container of check_type,
 650                         // we can access check_type even if it is private or protected.
 651                         return type_name.StartsWith (container);
 652                 }
 653
 654                 protected bool FamilyAccessible (Type check_type)
 655                 {
 656                         Type declaring = check_type.DeclaringType;
 657                         if (TypeBuilder == declaring ||
 658                             TypeBuilder.IsSubclassOf (declaring))
 659                                 return true;
 660
 661                         return NestedAccessible (check_type);
 662                 }
 663
 664                 // Access level of a type.
 665                 const int X = 1;
 666                 enum AccessLevel { // Each column represents `is this scope larger or equal to Blah scope'
 667                                             // Public    Assembly   Protected
 668                         Protected           = (0 << 0) | (0 << 1) | (X << 2),
 669                         Public              = (X << 0) | (X << 1) | (X << 2),
 670                         Private             = (0 << 0) | (0 << 1) | (0 << 2),
 671                         Internal            = (0 << 0) | (X << 1) | (0 << 2),
 672                         ProtectedOrInternal = (0 << 0) | (X << 1) | (X << 2),
 673                 }
 674
 675                 static AccessLevel GetAccessLevelFromModifiers (int flags)
 676                 {
 677                         if ((flags & Modifiers.INTERNAL) != 0) {
 678
 679                                 if ((flags & Modifiers.PROTECTED) != 0)
 680                                         return AccessLevel.ProtectedOrInternal;
 681                                 else
 682                                         return AccessLevel.Internal;
 683
 684                         } else if ((flags & Modifiers.PROTECTED) != 0)
 685                                 return AccessLevel.Protected;
 686
 687                         else if ((flags & Modifiers.PRIVATE) != 0)
 688                                 return AccessLevel.Private;
 689
 690                         else
 691                                 return AccessLevel.Public;
 692                 }
 693
 694                 // What is the effective access level of this?
 695                 // TODO: Cache this?
 696                 AccessLevel EffectiveAccessLevel {
 697                         get {
 698                                 AccessLevel myAccess = GetAccessLevelFromModifiers (ModFlags);
 699                                 if (!IsTopLevel && (Parent != null))
 700                                         return myAccess & Parent.EffectiveAccessLevel;
 701                                 else
 702                                         return myAccess;
 703                         }
 704                 }
 705
 706                 // Return the access level for type `t'
 707                 static AccessLevel TypeEffectiveAccessLevel (Type t)
 708                 {
 709                         if (t.IsPublic)
 710                                 return AccessLevel.Public;
 711                         if (t.IsNestedPrivate)
 712                                 return AccessLevel.Private;
 713                         if (t.IsNotPublic)
 714                                 return AccessLevel.Internal;
 715
 716                         // By now, it must be nested
 717                         AccessLevel parentLevel = TypeEffectiveAccessLevel (t.DeclaringType);
 718
 719                         if (t.IsNestedPublic)
 720                                 return parentLevel;
 721                         if (t.IsNestedAssembly)
 722                                 return parentLevel & AccessLevel.Internal;
 723                         if (t.IsNestedFamily)
 724                                 return parentLevel & AccessLevel.Protected;
 725                         if (t.IsNestedFamORAssem)
 726                                 return parentLevel & AccessLevel.ProtectedOrInternal;
 727                         if (t.IsNestedFamANDAssem)
 728                                 throw new NotImplementedException ("NestedFamANDAssem not implemented, cant make this kind of type from c# anyways");
 729
 730                         // nested private is taken care of
 731
 732                         throw new Exception ("I give up, what are you?");
 733                 }
 734
 735                 //
 736                 // This answers `is the type P, as accessible as a member M which has the
 737                 // accessability @flags which is declared as a nested member of the type T, this declspace'
 738                 //
 739                 public bool AsAccessible (Type p, int flags)
 740                 {
 741                         //
 742                         // 1) if M is private, its accessability is the same as this declspace.
 743                         // we already know that P is accessible to T before this method, so we
 744                         // may return true.
 745                         //
 746
 747                         if ((flags & Modifiers.PRIVATE) != 0)
 748                                 return true;
 749
 750                         while (p.IsArray || p.IsPointer || p.IsByRef)
 751                                 p = TypeManager.GetElementType (p);
 752
 753                         AccessLevel pAccess = TypeEffectiveAccessLevel (p);
 754                         AccessLevel mAccess = this.EffectiveAccessLevel &
 755                                 GetAccessLevelFromModifiers (flags);
 756
 757                         // for every place from which we can access M, we must
 758                         // be able to access P as well. So, we want
 759                         // For every bit in M and P, M_i -> P_1 == true
 760                         // or, ~ (M -> P) == 0 <-> ~ ( ~M | P) == 0
 761
 762                         return ~ (~ mAccess | pAccess) == 0;
 763                 }
 764
 765                 static DoubleHash dh = new DoubleHash (1000);
 766
 767                 Type DefineTypeAndParents (DeclSpace tc)
 768                 {
 769                         DeclSpace container = tc.Parent;
 770
 771                         if (container.TypeBuilder == null && container.Name != "")
 772                                 DefineTypeAndParents (container);
 773
 774                         return tc.DefineType ();
 775                 }
 776
 777                 Type LookupInterfaceOrClass (string ns, string name, out bool error)
 778                 {
 779                         DeclSpace parent;
 780                         Type t;
 781                         object r;
 782
 783                         error = false;
 784                         int p = name.LastIndexOf ('.');
 785
 786                         if (dh.Lookup (ns, name, out r))
 787                                 return (Type) r;
 788                         else {
 789                                 //
 790                                 // If the type is not a nested type, we do not need `LookupType's processing.
 791                                 // If the @name does not have a `.' in it, this cant be a nested type.
 792                                 //
 793                                 if (ns != ""){
 794                                         if (Namespace.IsNamespace (ns)) {
 795                                                 if (p != -1)
 796                                                         t = TypeManager.LookupType (ns + "." + name);
 797                                                 else
 798                                                         t = TypeManager.LookupTypeDirect (ns + "." + name);
 799                                         } else
 800                                                 t = null;
 801                                 } else if (p != -1)
 802                                         t = TypeManager.LookupType (name);
 803                                 else
 804                                         t = TypeManager.LookupTypeDirect (name);
 805                         }
 806
 807                         if (t != null) {
 808                                 dh.Insert (ns, name, t);
 809                                 return t;
 810                         }
 811
 812                         //
 813                         // In case we are fed a composite name, normalize it.
 814                         //
 815
 816                         if (p != -1){
 817                                 ns = MakeFQN (ns, name.Substring (0, p));
 818                                 name = name.Substring (p+1);
 819                         }
 820
 821                         parent = RootContext.Tree.LookupByNamespace (ns, name);
 822                         if (parent == null) {
 823                                 dh.Insert (ns, name, null);
 824                                 return null;
 825                         }
 826
 827                         t = DefineTypeAndParents (parent);
 828                         if (t == null){
 829                                 error = true;
 830                                 return null;
 831                         }
 832
 833                         dh.Insert (ns, name, t);
 834                         return t;
 835                 }
 836
 837                 public static void Error_AmbiguousTypeReference (Location loc, string name, Type t1, Type t2)
 838                 {
 839                         Report.Error (104, loc,
 840                                       String.Format ("`{0}' is an ambiguous reference ({1} or {2}) ", name,
 841                                                      t1.FullName, t2.FullName));
 842                 }
 843
 844                 /// <summary>
 845                 ///   GetType is used to resolve type names at the DeclSpace level.
 846                 ///   Use this to lookup class/struct bases, interface bases or
 847                 ///   delegate type references
 848                 /// </summary>
 849                 ///
 850                 /// <remarks>
 851                 ///   Contrast this to LookupType which is used inside method bodies to
 852                 ///   lookup types that have already been defined.  GetType is used
 853                 ///   during the tree resolution process and potentially define
 854                 ///   recursively the type
 855                 /// </remarks>
 856                 public Type FindType (Location loc, string name)
 857                 {
 858                         Type t;
 859                         bool error;
 860
 861                         //
 862                         // For the case the type we are looking for is nested within this one
 863                         // or is in any base class
 864                         //
 865                         DeclSpace containing_ds = this;
 866
 867                         while (containing_ds != null){
 868                                 Type container_type = containing_ds.TypeBuilder;
 869                                 Type current_type = container_type;
 870
 871                                 while (current_type != null && current_type != TypeManager.object_type) {
 872                                         string pre = current_type.FullName;
 873
 874                                         t = LookupInterfaceOrClass (pre, name, out error);
 875                                         if (error)
 876                                                 return null;
 877
 878                                         if ((t != null) && containing_ds.CheckAccessLevel (t))
 879                                                 return t;
 880
 881                                         current_type = current_type.BaseType;
 882                                 }
 883                                 containing_ds = containing_ds.Parent;
 884                         }
 885
 886                         //
 887                         // Attempt to lookup the class on our namespace and all it's implicit parents
 888                         //
 889                         for (NamespaceEntry ns = NamespaceEntry; ns != null; ns = ns.ImplicitParent) {
 890                                 t = LookupInterfaceOrClass (ns.FullName, name, out error);
 891                                 if (error)
 892                                         return null;
 893
 894                                 if (t != null)
 895                                         return t;
 896                         }
 897
 898                         //
 899                         // Attempt to do a direct unqualified lookup
 900                         //
 901                         t = LookupInterfaceOrClass ("", name, out error);
 902                         if (error)
 903                                 return null;
 904
 905                         if (t != null)
 906                                 return t;
 907
 908                         //
 909                         // Attempt to lookup the class on any of the `using'
 910                         // namespaces
 911                         //
 912
 913                         for (NamespaceEntry ns = NamespaceEntry; ns != null; ns = ns.Parent){
 914
 915                                 t = LookupInterfaceOrClass (ns.FullName, name, out error);
 916                                 if (error)
 917                                         return null;
 918
 919                                 if (t != null)
 920                                         return t;
 921
 922                                 if (name.IndexOf ('.') > 0)
 923                                         continue;
 924
 925                                 string alias_value = ns.LookupAlias (name);
 926                                 if (alias_value != null) {
 927                                         t = LookupInterfaceOrClass ("", alias_value, out error);
 928                                         if (error)
 929                                                 return null;
 930
 931                                         if (t != null)
 932                                                 return t;
 933                                 }
 934
 935                                 //
 936                                 // Now check the using clause list
 937                                 //
 938                                 Type match = null;
 939                                 foreach (Namespace using_ns in ns.GetUsingTable ()) {
 940                                         match = LookupInterfaceOrClass (using_ns.Name, name, out error);
 941                                         if (error)
 942                                                 return null;
 943
 944                                         if (match != null){
 945                                                 if (t != null){
 946                                                         if (CheckAccessLevel (match)) {
 947                                                                 Error_AmbiguousTypeReference (loc, name, t, match);
 948                                                                 return null;
 949                                                         }
 950                                                         continue;
 951                                                 }
 952
 953                                                 t = match;
 954                                         }
 955                                 }
 956                                 if (t != null)
 957                                         return t;
 958                         }
 959
 960                         //Report.Error (246, Location, "Can not find type `"+name+"'");
 961                         return null;
 962                 }
 963
 964                 /// <remarks>
 965                 ///   This function is broken and not what you're looking for.  It should only
 966                 ///   be used while the type is still being created since it doesn't use the cache
 967                 ///   and relies on the filter doing the member name check.
 968                 /// </remarks>
 969                 public abstract MemberList FindMembers (MemberTypes mt, BindingFlags bf,
 970                                                         MemberFilter filter, object criteria);
 971
 972                 /// <remarks>
 973                 ///   If we have a MemberCache, return it.  This property may return null if the
 974                 ///   class doesn't have a member cache or while it's still being created.
 975                 /// </remarks>
 976                 public abstract MemberCache MemberCache {
 977                         get;
 978                 }
 979
 980                 public override void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb)
 981                 {
 982                         try {
 983                                 TypeBuilder.SetCustomAttribute (cb);
 984                         } catch (System.ArgumentException e) {
 985                                 Report.Warning (-21, a.Location,
 986                                                 "The CharSet named property on StructLayout\n"+
 987                                                 "\tdoes not work correctly on Microsoft.NET\n"+
 988                                                 "\tYou might want to remove the CharSet declaration\n"+
 989                                                 "\tor compile using the Mono runtime instead of the\n"+
 990                                                 "\tMicrosoft .NET runtime\n"+
 991                                                 "\tThe runtime gave the error: " + e);
 992                         }
 993                 }
 994
 995                 /// <summary>
 996                 /// Goes through class hierarchy and get value of first CLSCompliantAttribute that found.
 997                 /// If no is attribute exists then return assembly CLSCompliantAttribute.
 998                 /// </summary>
 999                 public bool GetClsCompliantAttributeValue ()
1000                 {
1001                         if ((caching_flags & Flags.HasCompliantAttribute_Undetected) == 0)
1002                                 return (caching_flags & Flags.ClsCompliantAttributeTrue) != 0;
1003
1004                         caching_flags &= ~Flags.HasCompliantAttribute_Undetected;
1005
1006                         if (OptAttributes != null) {
1007                                 EmitContext ec = new EmitContext (Parent, this, Location,
1008                                                                   null, null, ModFlags, false);
1009                                 Attribute cls_attribute = OptAttributes.GetClsCompliantAttribute (ec);
1010                                 if (cls_attribute != null) {
1011                                         caching_flags |= Flags.HasClsCompliantAttribute;
1012                                         if (cls_attribute.GetClsCompliantAttributeValue (this)) {
1013                                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1014                                                 return true;
1015                                         }
1016                                         return false;
1017                                 }
1018                         }
1019
1020                         if (Parent == null) {
1021                                 if (CodeGen.Assembly.IsClsCompliant) {
1022                                         caching_flags |= Flags.ClsCompliantAttributeTrue;
1023                                         return true;
1024                                 }
1025                                 return false;
1026                         }
1027
1028                         if (Parent.GetClsCompliantAttributeValue ()) {
1029                                 caching_flags |= Flags.ClsCompliantAttributeTrue;
1030                                 return true;
1031                         }
1032                         return false;
1033                 }
1034
1035                 public override string[] ValidAttributeTargets {
1036                         get {
1037                                 return attribute_targets;
1038                         }
1039                 }
1040         }
1041
1042         /// <summary>
1043         ///   This is a readonly list of MemberInfo's.
1044         /// </summary>
1045         public class MemberList : IList {
1046                 public readonly IList List;
1047                 int count;
1048
1049                 /// <summary>
1050                 ///   Create a new MemberList from the given IList.
1051                 /// </summary>
1052                 public MemberList (IList list)
1053                 {
1054                         if (list != null)
1055                                 this.List = list;
1056                         else
1057                                 this.List = new ArrayList ();
1058                         count = List.Count;
1059                 }
1060
1061                 /// <summary>
1062                 ///   Concatenate the ILists `first' and `second' to a new MemberList.
1063                 /// </summary>
1064                 public MemberList (IList first, IList second)
1065                 {
1066                         ArrayList list = new ArrayList ();
1067                         list.AddRange (first);
1068                         list.AddRange (second);
1069                         count = list.Count;
1070                         List = list;
1071                 }
1072
1073                 public static readonly MemberList Empty = new MemberList (new ArrayList ());
1074
1075                 /// <summary>
1076                 ///   Cast the MemberList into a MemberInfo[] array.
1077                 /// </summary>
1078                 /// <remarks>
1079                 ///   This is an expensive operation, only use it if it's really necessary.
1080                 /// </remarks>
1081                 public static explicit operator MemberInfo [] (MemberList list)
1082                 {
1083                         Timer.StartTimer (TimerType.MiscTimer);
1084                         MemberInfo [] result = new MemberInfo [list.Count];
1085                         list.CopyTo (result, 0);
1086                         Timer.StopTimer (TimerType.MiscTimer);
1087                         return result;
1088                 }
1089
1090                 // ICollection
1091
1092                 public int Count {
1093                         get {
1094                                 return count;
1095                         }
1096                 }
1097
1098                 public bool IsSynchronized {
1099                         get {
1100                                 return List.IsSynchronized;
1101                         }
1102                 }
1103
1104                 public object SyncRoot {
1105                         get {
1106                                 return List.SyncRoot;
1107                         }
1108                 }
1109
1110                 public void CopyTo (Array array, int index)
1111                 {
1112                         List.CopyTo (array, index);
1113                 }
1114
1115                 // IEnumerable
1116
1117                 public IEnumerator GetEnumerator ()
1118                 {
1119                         return List.GetEnumerator ();
1120                 }
1121
1122                 // IList
1123
1124                 public bool IsFixedSize {
1125                         get {
1126                                 return true;
1127                         }
1128                 }
1129
1130                 public bool IsReadOnly {
1131                         get {
1132                                 return true;
1133                         }
1134                 }
1135
1136                 object IList.this [int index] {
1137                         get {
1138                                 return List [index];
1139                         }
1140
1141                         set {
1142                                 throw new NotSupportedException ();
1143                         }
1144                 }
1145
1146                 // FIXME: try to find out whether we can avoid the cast in this indexer.
1147                 public MemberInfo this [int index] {
1148                         get {
1149                                 return (MemberInfo) List [index];
1150                         }
1151                 }
1152
1153                 public int Add (object value)
1154                 {
1155                         throw new NotSupportedException ();
1156                 }
1157
1158                 public void Clear ()
1159                 {
1160                         throw new NotSupportedException ();
1161                 }
1162
1163                 public bool Contains (object value)
1164                 {
1165                         return List.Contains (value);
1166                 }
1167
1168                 public int IndexOf (object value)
1169                 {
1170                         return List.IndexOf (value);
1171                 }
1172
1173                 public void Insert (int index, object value)
1174                 {
1175                         throw new NotSupportedException ();
1176                 }
1177
1178                 public void Remove (object value)
1179                 {
1180                         throw new NotSupportedException ();
1181                 }
1182
1183                 public void RemoveAt (int index)
1184                 {
1185                         throw new NotSupportedException ();
1186                 }
1187         }
1188
1189         /// <summary>
1190         ///   This interface is used to get all members of a class when creating the
1191         ///   member cache.  It must be implemented by all DeclSpace derivatives which
1192         ///   want to support the member cache and by TypeHandle to get caching of
1193         ///   non-dynamic types.
1194         /// </summary>
1195         public interface IMemberContainer {
1196                 /// <summary>
1197                 ///   The name of the IMemberContainer.  This is only used for
1198                 ///   debugging purposes.
1199                 /// </summary>
1200                 string Name {
1201                         get;
1202                 }
1203
1204                 /// <summary>
1205                 ///   The type of this IMemberContainer.
1206                 /// </summary>
1207                 Type Type {
1208                         get;
1209                 }
1210
1211                 /// <summary>
1212                 ///   Returns the IMemberContainer of the parent class or null if this
1213                 ///   is an interface or TypeManger.object_type.
1214                 ///   This is used when creating the member cache for a class to get all
1215                 ///   members from the parent class.
1216                 /// </summary>
1217                 MemberCache ParentCache {
1218                         get;
1219                 }
1220
1221                 /// <summary>
1222                 ///   Whether this is an interface.
1223                 /// </summary>
1224                 bool IsInterface {
1225                         get;
1226                 }
1227
1228                 /// <summary>
1229                 ///   Returns all members of this class with the corresponding MemberTypes
1230                 ///   and BindingFlags.
1231                 /// </summary>
1232                 /// <remarks>
1233                 ///   When implementing this method, make sure not to return any inherited
1234                 ///   members and check the MemberTypes and BindingFlags properly.
1235                 ///   Unfortunately, System.Reflection is lame and doesn't provide a way to
1236                 ///   get the BindingFlags (static/non-static,public/non-public) in the
1237                 ///   MemberInfo class, but the cache needs this information.  That's why
1238                 ///   this method is called multiple times with different BindingFlags.
1239                 /// </remarks>
1240                 MemberList GetMembers (MemberTypes mt, BindingFlags bf);
1241
1242                 /// <summary>
1243                 ///   Return the container's member cache.
1244                 /// </summary>
1245                 MemberCache MemberCache {
1246                         get;
1247                 }
1248         }
1249
1250         /// <summary>
1251         ///   The MemberCache is used by dynamic and non-dynamic types to speed up
1252         ///   member lookups.  It has a member name based hash table; it maps each member
1253         ///   name to a list of CacheEntry objects.  Each CacheEntry contains a MemberInfo
1254         ///   and the BindingFlags that were initially used to get it.  The cache contains
1255         ///   all members of the current class and all inherited members.  If this cache is
1256         ///   for an interface types, it also contains all inherited members.
1257         ///
1258         ///   There are two ways to get a MemberCache:
1259         ///   * if this is a dynamic type, lookup the corresponding DeclSpace and then
1260         ///     use the DeclSpace.MemberCache property.
1261         ///   * if this not a dynamic type, call TypeHandle.GetTypeHandle() to get a
1262         ///     TypeHandle instance for the type and then use TypeHandle.MemberCache.
1263         /// </summary>
1264         public class MemberCache {
1265                 public readonly IMemberContainer Container;
1266                 protected Hashtable member_hash;
1267                 protected Hashtable method_hash;
1268
1269                 /// <summary>
1270                 ///   Create a new MemberCache for the given IMemberContainer `container'.
1271                 /// </summary>
1272                 public MemberCache (IMemberContainer container)
1273                 {
1274                         this.Container = container;
1275
1276                         Timer.IncrementCounter (CounterType.MemberCache);
1277                         Timer.StartTimer (TimerType.CacheInit);
1278
1279                         // If we have a parent class (we have a parent class unless we're
1280                         // TypeManager.object_type), we deep-copy its MemberCache here.
1281                         if (Container.ParentCache != null)
1282                                 member_hash = SetupCache (Container.ParentCache);
1283                         else
1284                                 member_hash = new Hashtable ();
1285
1286                         // If this is neither a dynamic type nor an interface, create a special
1287                         // method cache with all declared and inherited methods.
1288                         Type type = container.Type;
1289                         if (!(type is TypeBuilder) && !type.IsInterface) {
1290                                 method_hash = new Hashtable ();
1291                                 AddMethods (type);
1292                         }
1293
1294                         // Add all members from the current class.
1295                         AddMembers (Container);
1296
1297                         Timer.StopTimer (TimerType.CacheInit);
1298                 }
1299
1300                 public MemberCache (Type[] ifaces)
1301                 {
1302                         //
1303                         // The members of this cache all belong to other caches.
1304                         // So, 'Container' will not be used.
1305                         //
1306                         this.Container = null;
1307
1308                         member_hash = new Hashtable ();
1309                         if (ifaces == null)
1310                                 return;
1311
1312                         foreach (Type itype in ifaces)
1313                                 AddCacheContents (TypeManager.LookupMemberCache (itype));
1314                 }
1315
1316                 /// <summary>
1317                 ///   Bootstrap this member cache by doing a deep-copy of our parent.
1318                 /// </summary>
1319                 Hashtable SetupCache (MemberCache parent)
1320                 {
1321                         Hashtable hash = new Hashtable ();
1322
1323                         if (parent == null)
1324                                 return hash;
1325
1326                         IDictionaryEnumerator it = parent.member_hash.GetEnumerator ();
1327                         while (it.MoveNext ()) {
1328                                 hash [it.Key] = ((ArrayList) it.Value).Clone ();
1329                         }
1330
1331                         return hash;
1332                 }
1333
1334                 /// <summary>
1335                 ///   Add the contents of `cache' to the member_hash.
1336                 /// </summary>
1337                 void AddCacheContents (MemberCache cache)
1338                 {
1339                         IDictionaryEnumerator it = cache.member_hash.GetEnumerator ();
1340                         while (it.MoveNext ()) {
1341                                 ArrayList list = (ArrayList) member_hash [it.Key];
1342                                 if (list == null)
1343                                         member_hash [it.Key] = list = new ArrayList ();
1344
1345                                 ArrayList entries = (ArrayList) it.Value;
1346                                 for (int i = entries.Count-1; i >= 0; i--) {
1347                                         CacheEntry entry = (CacheEntry) entries [i];
1348
1349                                         if (entry.Container != cache.Container)
1350                                                 break;
1351                                         list.Add (entry);
1352                                 }
1353                         }
1354                 }
1355
1356                 /// <summary>
1357                 ///   Add all members from class `container' to the cache.
1358                 /// </summary>
1359                 void AddMembers (IMemberContainer container)
1360                 {
1361                         // We need to call AddMembers() with a single member type at a time
1362                         // to get the member type part of CacheEntry.EntryType right.
1363                         if (!container.IsInterface) {
1364                                 AddMembers (MemberTypes.Constructor, container);
1365                                 AddMembers (MemberTypes.Field, container);
1366                         }
1367                         AddMembers (MemberTypes.Method, container);
1368                         AddMembers (MemberTypes.Property, container);
1369                         AddMembers (MemberTypes.Event, container);
1370                         // Nested types are returned by both Static and Instance searches.
1371                         AddMembers (MemberTypes.NestedType,
1372                                     BindingFlags.Static | BindingFlags.Public, container);
1373                         AddMembers (MemberTypes.NestedType,
1374                                     BindingFlags.Static | BindingFlags.NonPublic, container);
1375                 }
1376
1377                 void AddMembers (MemberTypes mt, IMemberContainer container)
1378                 {
1379                         AddMembers (mt, BindingFlags.Static | BindingFlags.Public, container);
1380                         AddMembers (mt, BindingFlags.Static | BindingFlags.NonPublic, container);
1381                         AddMembers (mt, BindingFlags.Instance | BindingFlags.Public, container);
1382                         AddMembers (mt, BindingFlags.Instance | BindingFlags.NonPublic, container);
1383                 }
1384
1385                 /// <summary>
1386                 ///   Add all members from class `container' with the requested MemberTypes and
1387                 ///   BindingFlags to the cache.  This method is called multiple times with different
1388                 ///   MemberTypes and BindingFlags.
1389                 /// </summary>
1390                 void AddMembers (MemberTypes mt, BindingFlags bf, IMemberContainer container)
1391                 {
1392                         MemberList members = container.GetMembers (mt, bf);
1393
1394                         foreach (MemberInfo member in members) {
1395                                 string name = member.Name;
1396
1397                                 // We use a name-based hash table of ArrayList's.
1398                                 ArrayList list = (ArrayList) member_hash [name];
1399                                 if (list == null) {
1400                                         list = new ArrayList ();
1401                                         member_hash.Add (name, list);
1402                                 }
1403
1404                                 // When this method is called for the current class, the list will
1405                                 // already contain all inherited members from our parent classes.
1406                                 // We cannot add new members in front of the list since this'd be an
1407                                 // expensive operation, that's why the list is sorted in reverse order
1408                                 // (ie. members from the current class are coming last).
1409                                 list.Add (new CacheEntry (container, member, mt, bf));
1410                         }
1411                 }
1412
1413                 /// <summary>
1414                 ///   Add all declared and inherited methods from class `type' to the method cache.
1415                 /// </summary>
1416                 void AddMethods (Type type)
1417                 {
1418                         AddMethods (BindingFlags.Static | BindingFlags.Public |
1419                                     BindingFlags.FlattenHierarchy, type);
1420                         AddMethods (BindingFlags.Static | BindingFlags.NonPublic |
1421                                     BindingFlags.FlattenHierarchy, type);
1422                         AddMethods (BindingFlags.Instance | BindingFlags.Public, type);
1423                         AddMethods (BindingFlags.Instance | BindingFlags.NonPublic, type);
1424                 }
1425
1426                 void AddMethods (BindingFlags bf, Type type)
1427                 {
1428                         MemberInfo [] members = type.GetMethods (bf);
1429
1430                         Array.Reverse (members);
1431
1432                         foreach (MethodBase member in members) {
1433                                 string name = member.Name;
1434
1435                                 // We use a name-based hash table of ArrayList's.
1436                                 ArrayList list = (ArrayList) method_hash [name];
1437                                 if (list == null) {
1438                                         list = new ArrayList ();
1439                                         method_hash.Add (name, list);
1440                                 }
1441
1442                                 // Unfortunately, the elements returned by Type.GetMethods() aren't
1443                                 // sorted so we need to do this check for every member.
1444                                 BindingFlags new_bf = bf;
1445                                 if (member.DeclaringType == type)
1446                                         new_bf |= BindingFlags.DeclaredOnly;
1447
1448                                 list.Add (new CacheEntry (Container, member, MemberTypes.Method, new_bf));
1449                         }
1450
1451
1452                 }
1453
1454                 /// <summary>
1455                 ///   Compute and return a appropriate `EntryType' magic number for the given
1456                 ///   MemberTypes and BindingFlags.
1457                 /// </summary>
1458                 protected static EntryType GetEntryType (MemberTypes mt, BindingFlags bf)
1459                 {
1460                         EntryType type = EntryType.None;
1461
1462                         if ((mt & MemberTypes.Constructor) != 0)
1463                                 type |= EntryType.Constructor;
1464                         if ((mt & MemberTypes.Event) != 0)
1465                                 type |= EntryType.Event;
1466                         if ((mt & MemberTypes.Field) != 0)
1467                                 type |= EntryType.Field;
1468                         if ((mt & MemberTypes.Method) != 0)
1469                                 type |= EntryType.Method;
1470                         if ((mt & MemberTypes.Property) != 0)
1471                                 type |= EntryType.Property;
1472                         // Nested types are returned by static and instance searches.
1473                         if ((mt & MemberTypes.NestedType) != 0)
1474                                 type |= EntryType.NestedType | EntryType.Static | EntryType.Instance;
1475
1476                         if ((bf & BindingFlags.Instance) != 0)
1477                                 type |= EntryType.Instance;
1478                         if ((bf & BindingFlags.Static) != 0)
1479                                 type |= EntryType.Static;
1480                         if ((bf & BindingFlags.Public) != 0)
1481                                 type |= EntryType.Public;
1482                         if ((bf & BindingFlags.NonPublic) != 0)
1483                                 type |= EntryType.NonPublic;
1484                         if ((bf & BindingFlags.DeclaredOnly) != 0)
1485                                 type |= EntryType.Declared;
1486
1487                         return type;
1488                 }
1489
1490                 /// <summary>
1491                 ///   The `MemberTypes' enumeration type is a [Flags] type which means that it may
1492                 ///   denote multiple member types.  Returns true if the given flags value denotes a
1493                 ///   single member types.
1494                 /// </summary>
1495                 public static bool IsSingleMemberType (MemberTypes mt)
1496                 {
1497                         switch (mt) {
1498                         case MemberTypes.Constructor:
1499                         case MemberTypes.Event:
1500                         case MemberTypes.Field:
1501                         case MemberTypes.Method:
1502                         case MemberTypes.Property:
1503                         case MemberTypes.NestedType:
1504                                 return true;
1505
1506                         default:
1507                                 return false;
1508                         }
1509                 }
1510
1511                 /// <summary>
1512                 ///   We encode the MemberTypes and BindingFlags of each members in a "magic"
1513                 ///   number to speed up the searching process.
1514                 /// </summary>
1515                 [Flags]
1516                 protected enum EntryType {
1517                         None            = 0x000,
1518
1519                         Instance        = 0x001,
1520                         Static          = 0x002,
1521                         MaskStatic      = Instance|Static,
1522
1523                         Public          = 0x004,
1524                         NonPublic       = 0x008,
1525                         MaskProtection  = Public|NonPublic,
1526
1527                         Declared        = 0x010,
1528
1529                         Constructor     = 0x020,
1530                         Event           = 0x040,
1531                         Field           = 0x080,
1532                         Method          = 0x100,
1533                         Property        = 0x200,
1534                         NestedType      = 0x400,
1535
1536                         MaskType        = Constructor|Event|Field|Method|Property|NestedType
1537                 }
1538
1539                 protected struct CacheEntry {
1540                         public readonly IMemberContainer Container;
1541                         public readonly EntryType EntryType;
1542                         public readonly MemberInfo Member;
1543
1544                         public CacheEntry (IMemberContainer container, MemberInfo member,
1545                                            MemberTypes mt, BindingFlags bf)
1546                         {
1547                                 this.Container = container;
1548                                 this.Member = member;
1549                                 this.EntryType = GetEntryType (mt, bf);
1550                         }
1551
1552                         public override string ToString ()
1553                         {
1554                                 return String.Format ("CacheEntry ({0}:{1}:{2})", Container.Name,
1555                                                       EntryType, Member);
1556                         }
1557                 }
1558
1559                 /// <summary>
1560                 ///   This is called each time we're walking up one level in the class hierarchy
1561                 ///   and checks whether we can abort the search since we've already found what
1562                 ///   we were looking for.
1563                 /// </summary>
1564                 protected bool DoneSearching (ArrayList list)
1565                 {
1566                         //
1567                         // We've found exactly one member in the current class and it's not
1568                         // a method or constructor.
1569                         //
1570                         if (list.Count == 1 && !(list [0] is MethodBase))
1571                                 return true;
1572
1573                         //
1574                         // Multiple properties: we query those just to find out the indexer
1575                         // name
1576                         //
1577                         if ((list.Count > 0) && (list [0] is PropertyInfo))
1578                                 return true;
1579
1580                         return false;
1581                 }
1582
1583                 /// <summary>
1584                 ///   Looks up members with name `name'.  If you provide an optional
1585                 ///   filter function, it'll only be called with members matching the
1586                 ///   requested member name.
1587                 ///
1588                 ///   This method will try to use the cache to do the lookup if possible.
1589                 ///
1590                 ///   Unlike other FindMembers implementations, this method will always
1591                 ///   check all inherited members - even when called on an interface type.
1592                 ///
1593                 ///   If you know that you're only looking for methods, you should use
1594                 ///   MemberTypes.Method alone since this speeds up the lookup a bit.
1595                 ///   When doing a method-only search, it'll try to use a special method
1596                 ///   cache (unless it's a dynamic type or an interface) and the returned
1597                 ///   MemberInfo's will have the correct ReflectedType for inherited methods.
1598                 ///   The lookup process will automatically restart itself in method-only
1599                 ///   search mode if it discovers that it's about to return methods.
1600                 /// </summary>
1601                 ArrayList global = new ArrayList ();
1602                 bool using_global = false;
1603
1604                 static MemberInfo [] emptyMemberInfo = new MemberInfo [0];
1605
1606                 public MemberInfo [] FindMembers (MemberTypes mt, BindingFlags bf, string name,
1607                                                   MemberFilter filter, object criteria)
1608                 {
1609                         if (using_global)
1610                                 throw new Exception ();
1611
1612                         bool declared_only = (bf & BindingFlags.DeclaredOnly) != 0;
1613                         bool method_search = mt == MemberTypes.Method;
1614                         // If we have a method cache and we aren't already doing a method-only search,
1615                         // then we restart a method search if the first match is a method.
1616                         bool do_method_search = !method_search && (method_hash != null);
1617
1618                         ArrayList applicable;
1619
1620                         // If this is a method-only search, we try to use the method cache if
1621                         // possible; a lookup in the method cache will return a MemberInfo with
1622                         // the correct ReflectedType for inherited methods.
1623
1624                         if (method_search && (method_hash != null))
1625                                 applicable = (ArrayList) method_hash [name];
1626                         else
1627                                 applicable = (ArrayList) member_hash [name];
1628
1629                         if (applicable == null)
1630                                 return emptyMemberInfo;
1631
1632                         //
1633                         // 32  slots gives 53 rss/54 size
1634                         // 2/4 slots gives 55 rss
1635                         //
1636                         // Strange: from 25,000 calls, only 1,800
1637                         // are above 2.  Why does this impact it?
1638                         //
1639                         global.Clear ();
1640                         using_global = true;
1641
1642                         Timer.StartTimer (TimerType.CachedLookup);
1643
1644                         EntryType type = GetEntryType (mt, bf);
1645
1646                         IMemberContainer current = Container;
1647
1648
1649                         // `applicable' is a list of all members with the given member name `name'
1650                         // in the current class and all its parent classes.  The list is sorted in
1651                         // reverse order due to the way how the cache is initialy created (to speed
1652                         // things up, we're doing a deep-copy of our parent).
1653
1654                         for (int i = applicable.Count-1; i >= 0; i--) {
1655                                 CacheEntry entry = (CacheEntry) applicable [i];
1656
1657                                 // This happens each time we're walking one level up in the class
1658                                 // hierarchy.  If we're doing a DeclaredOnly search, we must abort
1659                                 // the first time this happens (this may already happen in the first
1660                                 // iteration of this loop if there are no members with the name we're
1661                                 // looking for in the current class).
1662                                 if (entry.Container != current) {
1663                                         if (declared_only || DoneSearching (global))
1664                                                 break;
1665
1666                                         current = entry.Container;
1667                                 }
1668
1669                                 // Is the member of the correct type ?
1670                                 if ((entry.EntryType & type & EntryType.MaskType) == 0)
1671                                         continue;
1672
1673                                 // Is the member static/non-static ?
1674                                 if ((entry.EntryType & type & EntryType.MaskStatic) == 0)
1675                                         continue;
1676
1677                                 // Apply the filter to it.
1678                                 if (filter (entry.Member, criteria)) {
1679                                         if ((entry.EntryType & EntryType.MaskType) != EntryType.Method)
1680                                                 do_method_search = false;
1681                                         global.Add (entry.Member);
1682                                 }
1683                         }
1684
1685                         Timer.StopTimer (TimerType.CachedLookup);
1686
1687                         // If we have a method cache and we aren't already doing a method-only
1688                         // search, we restart in method-only search mode if the first match is
1689                         // a method.  This ensures that we return a MemberInfo with the correct
1690                         // ReflectedType for inherited methods.
1691                         if (do_method_search && (global.Count > 0)){
1692                                 using_global = false;
1693
1694                                 return FindMembers (MemberTypes.Method, bf, name, filter, criteria);
1695                         }
1696
1697                         using_global = false;
1698                         MemberInfo [] copy = new MemberInfo [global.Count];
1699                         global.CopyTo (copy);
1700                         return copy;
1701                 }
1702
1703                 // find the nested type @name in @this.
1704                 public Type FindNestedType (string name)
1705                 {
1706                         ArrayList applicable = (ArrayList) member_hash [name];
1707                         if (applicable == null)
1708                                 return null;
1709
1710                         for (int i = applicable.Count-1; i >= 0; i--) {
1711                                 CacheEntry entry = (CacheEntry) applicable [i];
1712                                 if ((entry.EntryType & EntryType.NestedType & EntryType.MaskType) != 0)
1713                                         return (Type) entry.Member;
1714                         }
1715
1716                         return null;
1717                 }
1718
1719                 //
1720                 // This finds the method or property for us to override. invocationType is the type where
1721                 // the override is going to be declared, name is the name of the method/property, and
1722                 // paramTypes is the parameters, if any to the method or property
1723                 //
1724                 // Because the MemberCache holds members from this class and all the base classes,
1725                 // we can avoid tons of reflection stuff.
1726                 //
1727                 public MemberInfo FindMemberToOverride (Type invocationType, string name, Type [] paramTypes, bool is_property)
1728                 {
1729                         ArrayList applicable;
1730                         if (method_hash != null && !is_property)
1731                                 applicable = (ArrayList) method_hash [name];
1732                         else
1733                                 applicable = (ArrayList) member_hash [name];
1734
1735                         if (applicable == null)
1736                                 return null;
1737                         //
1738                         // Walk the chain of methods, starting from the top.
1739                         //
1740                         for (int i = applicable.Count - 1; i >= 0; i--) {
1741                                 CacheEntry entry = (CacheEntry) applicable [i];
1742
1743                                 if ((entry.EntryType & (is_property ? (EntryType.Property | EntryType.Field) : EntryType.Method)) == 0)
1744                                         continue;
1745
1746                                 PropertyInfo pi = null;
1747                                 MethodInfo mi = null;
1748                                 FieldInfo fi = null;
1749                                 Type [] cmpAttrs = null;
1750
1751                                 if (is_property) {
1752                                         if ((entry.EntryType & EntryType.Field) != 0) {
1753                                                 fi = (FieldInfo)entry.Member;
1754
1755                                                 // TODO: For this case we ignore member type
1756                                                 //fb = TypeManager.GetField (fi);
1757                                                 //cmpAttrs = new Type[] { fb.MemberType };
1758                                         } else {
1759                                                 pi = (PropertyInfo) entry.Member;
1760                                                 cmpAttrs = TypeManager.GetArgumentTypes (pi);
1761                                         }
1762                                 } else {
1763                                         mi = (MethodInfo) entry.Member;
1764                                         cmpAttrs = TypeManager.GetArgumentTypes (mi);
1765                                 }
1766
1767                                 if (fi != null) {
1768                                         // TODO: Almost duplicate !
1769                                         // Check visibility
1770                                         switch (fi.Attributes & FieldAttributes.FieldAccessMask) {
1771                                                 case FieldAttributes.Private:
1772                                                         //
1773                                                         // A private method is Ok if we are a nested subtype.
1774                                                         // The spec actually is not very clear about this, see bug 52458.
1775                                                         //
1776                                                         if (invocationType != entry.Container.Type &
1777                                                                 TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1778                                                                 continue;
1779
1780                                                         break;
1781                                                 case FieldAttributes.FamANDAssem:
1782                                                 case FieldAttributes.Assembly:
1783                                                         //
1784                                                         // Check for assembly methods
1785                                                         //
1786                                                         if (mi.DeclaringType.Assembly != CodeGen.Assembly.Builder)
1787                                                                 continue;
1788                                                         break;
1789                                         }
1790                                         return entry.Member;
1791                                 }
1792
1793                                 //
1794                                 // Check the arguments
1795                                 //
1796                                 if (cmpAttrs.Length != paramTypes.Length)
1797                                         continue;
1798
1799                                 for (int j = cmpAttrs.Length - 1; j >= 0; j --)
1800                                         if (paramTypes [j] != cmpAttrs [j])
1801                                                 goto next;
1802
1803                                 //
1804                                 // get one of the methods because this has the visibility info.
1805                                 //
1806                                 if (is_property) {
1807                                         mi = pi.GetGetMethod (true);
1808                                         if (mi == null)
1809                                                 mi = pi.GetSetMethod (true);
1810                                 }
1811
1812                                 //
1813                                 // Check visibility
1814                                 //
1815                                 switch (mi.Attributes & MethodAttributes.MemberAccessMask) {
1816                                 case MethodAttributes.Private:
1817                                         //
1818                                         // A private method is Ok if we are a nested subtype.
1819                                         // The spec actually is not very clear about this, see bug 52458.
1820                                         //
1821                                         if (invocationType == entry.Container.Type ||
1822                                             TypeManager.IsNestedChildOf (invocationType, entry.Container.Type))
1823                                                 return entry.Member;
1824
1825                                         break;
1826                                 case MethodAttributes.FamANDAssem:
1827                                 case MethodAttributes.Assembly:
1828                                         //
1829                                         // Check for assembly methods
1830                                         //
1831                                         if (mi.DeclaringType.Assembly == CodeGen.Assembly.Builder)
1832                                                 return entry.Member;
1833
1834                                         break;
1835                                 default:
1836                                         //
1837                                         // A protected method is ok, because we are overriding.
1838                                         // public is always ok.
1839                                         //
1840                                         return entry.Member;
1841                                 }
1842                         next:
1843                                 ;
1844                         }
1845
1846                         return null;
1847                 }
1848
1849                 /// <summary>
1850                 /// The method is looking for conflict with inherited symbols (errors CS0108, CS0109).
1851                 /// We handle two cases. The first is for types without parameters (events, field, properties).
1852                 /// The second are methods, indexers and this is why ignore_complex_types is here.
1853                 /// The latest param is temporary hack. See DoDefineMembers method for more info.
1854                 /// </summary>
1855                 public MemberInfo FindMemberWithSameName (string name, bool ignore_complex_types, MemberInfo ignore_member)
1856                 {
1857                         ArrayList applicable = null;
1858
1859                         if (method_hash != null)
1860                                 applicable = (ArrayList) method_hash [name];
1861
1862                         if (applicable != null) {
1863                                 for (int i = applicable.Count - 1; i >= 0; i--) {
1864                                         CacheEntry entry = (CacheEntry) applicable [i];
1865                                         if ((entry.EntryType & EntryType.Public) != 0)
1866                                                 return entry.Member;
1867                                 }
1868                         }
1869
1870                         if (member_hash == null)
1871                                 return null;
1872                         applicable = (ArrayList) member_hash [name];
1873
1874                         if (applicable != null) {
1875                                 for (int i = applicable.Count - 1; i >= 0; i--) {
1876                                         CacheEntry entry = (CacheEntry) applicable [i];
1877                                         if ((entry.EntryType & EntryType.Public) != 0 & entry.Member != ignore_member) {
1878                                                 if (ignore_complex_types) {
1879                                                         if ((entry.EntryType & EntryType.Method) != 0)
1880                                                                 continue;
1881
1882                                                         // Does exist easier way how to detect indexer ?
1883                                                         if ((entry.EntryType & EntryType.Property) != 0) {
1884                                                                 Type[] arg_types = TypeManager.GetArgumentTypes ((PropertyInfo)entry.Member);
1885                                                                 if (arg_types.Length > 0)
1886                                                                         continue;
1887                                                         }
1888                                                 }
1889                                                 return entry.Member;
1890                                         }
1891                                 }
1892                         }
1893                         return null;
1894                 }
1895
1896                 Hashtable locase_table;
1897
1898                 /// <summary>
1899                 /// Builds low-case table for CLS Compliance test
1900                 /// </summary>
1901                 public Hashtable GetPublicMembers ()
1902                 {
1903                         if (locase_table != null)
1904                                 return locase_table;
1905
1906                         locase_table = new Hashtable ();
1907                         foreach (DictionaryEntry entry in member_hash) {
1908                                 ArrayList members = (ArrayList)entry.Value;
1909                                 for (int ii = 0; ii < members.Count; ++ii) {
1910                                         CacheEntry member_entry = (CacheEntry) members [ii];
1911
1912                                         if ((member_entry.EntryType & EntryType.Public) == 0)
1913                                                 continue;
1914
1915                                         // TODO: Does anyone know easier way how to detect that member is internal ?
1916                                         switch (member_entry.EntryType & EntryType.MaskType) {
1917                                                 case EntryType.Constructor:
1918                                                         continue;
1919
1920                                                 case EntryType.Field:
1921                                                         if ((((FieldInfo)member_entry.Member).Attributes & (FieldAttributes.Assembly | FieldAttributes.Public)) == FieldAttributes.Assembly)
1922                                                                 continue;
1923                                                         break;
1924
1925                                                 case EntryType.Method:
1926                                                         if ((((MethodInfo)member_entry.Member).Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
1927                                                                 continue;
1928                                                         break;
1929
1930                                                 case EntryType.Property:
1931                                                         PropertyInfo pi = (PropertyInfo)member_entry.Member;
1932                                                         if (pi.GetSetMethod () == null && pi.GetGetMethod () == null)
1933                                                                 continue;
1934                                                         break;
1935
1936                                                 case EntryType.Event:
1937                                                         EventInfo ei = (EventInfo)member_entry.Member;
1938                                                         MethodInfo mi = ei.GetAddMethod ();
1939                                                         if ((mi.Attributes & (MethodAttributes.Assembly | MethodAttributes.Public)) == MethodAttributes.Assembly)
1940                                                                 continue;
1941                                                         break;
1942                                         }
1943                                         string lcase = ((string)entry.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture);
1944                                         locase_table [lcase] = member_entry.Member;
1945                                         break;
1946                                 }
1947                         }
1948                         return locase_table;
1949                 }
1950
1951                 public Hashtable Members {
1952                         get {
1953                                 return member_hash;
1954                         }
1955                 }
1956
1957                 /// <summary>
1958                 /// Cls compliance check whether methods or constructors parameters differing only in ref or out, or in array rank
1959                 /// </summary>
1960                 public void VerifyClsParameterConflict (ArrayList al, MethodCore method, MemberInfo this_builder)
1961                 {
1962                         EntryType tested_type = (method is Constructor ? EntryType.Constructor : EntryType.Method) | EntryType.Public;
1963
1964                         for (int i = 0; i < al.Count; ++i) {
1965                                 MemberCache.CacheEntry entry = (MemberCache.CacheEntry) al [i];
1966
1967                                 // skip itself
1968                                 if (entry.Member == this_builder)
1969                                         continue;
1970
1971                                 if ((entry.EntryType & tested_type) != tested_type)
1972                                         continue;
1973
1974                                 MethodBase method_to_compare = (MethodBase)entry.Member;
1975                                 if (AttributeTester.AreOverloadedMethodParamsClsCompliant (method.ParameterTypes, TypeManager.GetArgumentTypes (method_to_compare)))
1976                                         continue;
1977
1978                                 IMethodData md = TypeManager.GetMethod (method_to_compare);
1979
1980                                 // TODO: now we are ignoring CLSCompliance(false) on method from other assembly which is buggy.
1981                                 // However it is exactly what csc does.
1982                                 if (md != null && !md.IsClsCompliaceRequired (method.Parent))
1983                                         continue;
1984
1985                                 Report.SymbolRelatedToPreviousError (entry.Member);
1986                                 Report.Error (3006, method.Location, "Overloaded method '{0}' differing only in ref or out, or in array rank, is not CLS-compliant", method.GetSignatureForError ());
1987                         }
1988                 }
1989         }
1990 }