mcs/mcs/decl.cs

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