mcs/mcs/decl.cs

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