mcs/mcs/attribute.cs

   1 //
   2 // attribute.cs: Attribute Handler
   3 //
   4 // Author: Ravi Pratap (ravi@ximian.com)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Dual licensed under the terms of the MIT X11 or GNU GPL
   8 //
   9 // Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
  10 // Copyright 2003-2008 Novell, Inc.
  11 //
  12
  13 using System;
  14 using System.Diagnostics;
  15 using System.Collections;
  16 using System.Collections.Specialized;
  17 using System.Reflection;
  18 using System.Reflection.Emit;
  19 using System.Runtime.InteropServices;
  20 using System.Runtime.CompilerServices;
  21 using System.Security;
  22 using System.Security.Permissions;
  23 using System.Text;
  24 using System.IO;
  25
  26 namespace Mono.CSharp {
  27
  28         /// <summary>
  29         ///   Base class for objects that can have Attributes applied to them.
  30         /// </summary>
  31         public abstract class Attributable {
  32                 /// <summary>
  33                 ///   Attributes for this type
  34                 /// </summary>
  35                 protected Attributes attributes;
  36
  37                 public Attributable (Attributes attrs)
  38                 {
  39                         if (attrs != null)
  40                                 OptAttributes = attrs;
  41                 }
  42
  43                 public Attributes OptAttributes
  44                 {
  45                         get {
  46                                 return attributes;
  47                         }
  48                         set {
  49                                 attributes = value;
  50
  51                                 if (attributes != null) {
  52                                         attributes.AttachTo (this);
  53                                 }
  54                         }
  55                 }
  56
  57                 /// <summary>
  58                 /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
  59                 /// </summary>
  60                 public abstract void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa);
  61
  62                 /// <summary>
  63                 /// Returns one AttributeTarget for this element.
  64                 /// </summary>
  65                 public abstract AttributeTargets AttributeTargets { get; }
  66
  67                 public abstract IResolveContext ResolveContext { get; }
  68
  69                 public abstract bool IsClsComplianceRequired ();
  70
  71                 /// <summary>
  72                 /// Gets list of valid attribute targets for explicit target declaration.
  73                 /// The first array item is default target. Don't break this rule.
  74                 /// </summary>
  75                 public abstract string[] ValidAttributeTargets { get; }
  76         };
  77
  78         public class Attribute : Expression
  79         {
  80                 //
  81                 // Wraps owner resolve context, the owner is an attribute
  82                 // parent and the rest is exactly same
  83                 //
  84                 struct AttributeResolveContext : IResolveContext
  85                 {
  86                         readonly IResolveContext rc;
  87
  88                         public AttributeResolveContext (IResolveContext rc)
  89                         {
  90                                 this.rc = rc;
  91                         }
  92
  93                         #region IResolveContext Members
  94
  95                         public DeclSpace DeclContainer {
  96                                 get {
  97                                         DeclSpace ds = rc as DeclSpace;
  98                                         if (ds == null)
  99                                                 return rc.DeclContainer;
 100
 101                                         return ds;
 102                                 }
 103                         }
 104
 105                         public bool IsInObsoleteScope {
 106                                 get { return rc.IsInObsoleteScope; }
 107                         }
 108
 109                         public bool IsInUnsafeScope {
 110                                 get { return rc.IsInUnsafeScope; }
 111                         }
 112
 113                         public DeclSpace GenericDeclContainer {
 114                                 get { return rc.GenericDeclContainer; }
 115                         }
 116
 117                         #endregion
 118                 }
 119
 120                 public readonly string ExplicitTarget;
 121                 public AttributeTargets Target;
 122
 123                 // TODO: remove this member
 124                 public readonly string    Name;
 125                 public readonly Expression LeftExpr;
 126                 public readonly string Identifier;
 127
 128                 ArrayList PosArguments;
 129                 ArrayList NamedArguments;
 130
 131                 bool resolve_error;
 132                 readonly bool nameEscaped;
 133
 134                 // It can contain more onwers when the attribute is applied to multiple fiels.
 135                 protected Attributable[] owners;
 136
 137                 static readonly AttributeUsageAttribute DefaultUsageAttribute = new AttributeUsageAttribute (AttributeTargets.All);
 138                 static Assembly orig_sec_assembly;
 139                 public static readonly object[] EmptyObject = new object [0];
 140
 141                 // non-null if named args present after Resolve () is called
 142                 PropertyInfo [] prop_info_arr;
 143                 FieldInfo [] field_info_arr;
 144                 object [] field_values_arr;
 145                 object [] prop_values_arr;
 146                 object [] pos_values;
 147
 148                 static PtrHashtable usage_attr_cache;
 149                 // Cache for parameter-less attributes
 150                 static PtrHashtable att_cache;
 151
 152                 public Attribute (string target, Expression left_expr, string identifier, object[] args, Location loc, bool nameEscaped)
 153                 {
 154                         LeftExpr = left_expr;
 155                         Identifier = identifier;
 156                         Name = LeftExpr == null ? identifier : LeftExpr + "." + identifier;
 157                         if (args != null) {
 158                                 PosArguments = (ArrayList)args [0];
 159                                 NamedArguments = (ArrayList)args [1];
 160                         }
 161                         this.loc = loc;
 162                         ExplicitTarget = target;
 163                         this.nameEscaped = nameEscaped;
 164                 }
 165
 166                 public Attribute Clone ()
 167                 {
 168                         Attribute a = new Attribute (ExplicitTarget, LeftExpr, Identifier, null, loc, nameEscaped);
 169                         a.PosArguments = PosArguments;
 170                         a.NamedArguments = NamedArguments;
 171                         return a;
 172                 }
 173
 174                 static Attribute ()
 175                 {
 176                         Reset ();
 177                 }
 178
 179                 public static void Reset ()
 180                 {
 181                         usage_attr_cache = new PtrHashtable ();
 182                         att_cache = new PtrHashtable ();
 183                 }
 184
 185                 public virtual void AttachTo (Attributable owner)
 186                 {
 187                         if (this.owners == null) {
 188                                 this.owners = new Attributable[1] { owner };
 189                                 return;
 190                         }
 191
 192                         // When the same attribute is attached to multiple fiels
 193                         // we use this extra_owners as a list of owners. The attribute
 194                         // then can be removed because will be emitted when first owner
 195                         // is served
 196                         Attributable[] new_array = new Attributable [this.owners.Length + 1];
 197                         owners.CopyTo (new_array, 0);
 198                         new_array [owners.Length] = owner;
 199                         this.owners = new_array;
 200                         owner.OptAttributes = null;
 201                 }
 202
 203                 void Error_InvalidNamedArgument (string name)
 204                 {
 205                         Report.Error (617, Location, "`{0}' is not a valid named attribute argument. Named attribute arguments " +
 206                                       "must be fields which are not readonly, static, const or read-write properties which are " +
 207                                       "public and not static",
 208                               name);
 209                 }
 210
 211                 void Error_InvalidNamedAgrumentType (string name)
 212                 {
 213                         Report.Error (655, Location, "`{0}' is not a valid named attribute argument because it is not a valid " +
 214                                       "attribute parameter type", name);
 215                 }
 216
 217                 public static void Error_AttributeArgumentNotValid (Location loc)
 218                 {
 219                         Report.Error (182, loc,
 220                                       "An attribute argument must be a constant expression, typeof " +
 221                                       "expression or array creation expression");
 222                 }
 223
 224                 static void Error_TypeParameterInAttribute (Location loc)
 225                 {
 226                         Report.Error (
 227                                 -202, loc, "Can not use a type parameter in an attribute");
 228                 }
 229
 230                 public void Error_MissingGuidAttribute ()
 231                 {
 232                         Report.Error (596, Location, "The Guid attribute must be specified with the ComImport attribute");
 233                 }
 234
 235                 public void Error_MisusedExtensionAttribute ()
 236                 {
 237                         Report.Error (1112, Location, "Do not use `{0}' directly. Use parameter modifier `this' instead", GetSignatureForError ());
 238                 }
 239
 240                 /// <summary>
 241                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 242                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 243                 /// </summary>
 244                 public void Error_AttributeEmitError (string inner)
 245                 {
 246                         Report.Error (647, Location, "Error during emitting `{0}' attribute. The reason is `{1}'",
 247                                       TypeManager.CSharpName (Type), inner);
 248                 }
 249
 250                 public void Error_InvalidSecurityParent ()
 251                 {
 252                         Error_AttributeEmitError ("it is attached to invalid parent");
 253                 }
 254
 255                 Attributable Owner {
 256                         get {
 257                                 return owners [0];
 258                         }
 259                 }
 260
 261                 protected virtual TypeExpr ResolveAsTypeTerminal (Expression expr, IResolveContext ec, bool silent)
 262                 {
 263                         return expr.ResolveAsTypeTerminal (ec, silent);
 264                 }
 265
 266                 Type ResolvePossibleAttributeType (string name, bool silent, ref bool is_attr)
 267                 {
 268                         IResolveContext rc = new AttributeResolveContext (Owner.ResolveContext);
 269
 270                         TypeExpr te;
 271                         if (LeftExpr == null) {
 272                                 te = ResolveAsTypeTerminal (new SimpleName (name, Location), rc, silent);
 273                         } else {
 274                                 te = ResolveAsTypeTerminal (new MemberAccess (LeftExpr, name), rc, silent);
 275                         }
 276
 277                         if (te == null)
 278                                 return null;
 279
 280                         Type t = te.Type;
 281                         if (TypeManager.IsSubclassOf (t, TypeManager.attribute_type)) {
 282                                 is_attr = true;
 283                         } else if (!silent) {
 284                                 Report.SymbolRelatedToPreviousError (t);
 285                                 Report.Error (616, Location, "`{0}': is not an attribute class", TypeManager.CSharpName (t));
 286                         }
 287                         return t;
 288                 }
 289
 290                 /// <summary>
 291                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 292                 /// </summary>
 293                 void ResolveAttributeType ()
 294                 {
 295                         bool t1_is_attr = false;
 296                         Type t1 = ResolvePossibleAttributeType (Identifier, true, ref t1_is_attr);
 297
 298                         bool t2_is_attr = false;
 299                         Type t2 = nameEscaped ? null :
 300                                 ResolvePossibleAttributeType (Identifier + "Attribute", true, ref t2_is_attr);
 301
 302                         if (t1_is_attr && t2_is_attr) {
 303                                 Report.Error (1614, Location, "`{0}' is ambiguous between `{0}' and `{0}Attribute'. " +
 304                                               "Use either `@{0}' or `{0}Attribute'", GetSignatureForError ());
 305                                 resolve_error = true;
 306                                 return;
 307                         }
 308
 309                         if (t1_is_attr) {
 310                                 Type = t1;
 311                                 return;
 312                         }
 313
 314                         if (t2_is_attr) {
 315                                 Type = t2;
 316                                 return;
 317                         }
 318
 319                         if (t1 == null && t2 == null)
 320                                 ResolvePossibleAttributeType (Identifier, false, ref t1_is_attr);
 321                         if (t1 != null)
 322                                 ResolvePossibleAttributeType (Identifier, false, ref t1_is_attr);
 323                         if (t2 != null)
 324                                 ResolvePossibleAttributeType (Identifier + "Attribute", false, ref t2_is_attr);
 325
 326                         resolve_error = true;
 327                 }
 328
 329                 public virtual Type ResolveType ()
 330                 {
 331                         if (Type == null && !resolve_error)
 332                                 ResolveAttributeType ();
 333                         return Type;
 334                 }
 335
 336                 public override string GetSignatureForError ()
 337                 {
 338                         if (Type != null)
 339                                 return TypeManager.CSharpName (Type);
 340
 341                         return LeftExpr == null ? Identifier : LeftExpr.GetSignatureForError () + "." + Identifier;
 342                 }
 343
 344                 public bool HasSecurityAttribute {
 345                         get {
 346                                 PredefinedAttribute pa = PredefinedAttributes.Get.Security;
 347                                 return pa.IsDefined && TypeManager.IsSubclassOf (type, pa.Type);
 348                         }
 349                 }
 350
 351                 public bool IsValidSecurityAttribute ()
 352                 {
 353                         return HasSecurityAttribute && IsSecurityActionValid (false);
 354                 }
 355
 356                 static bool IsValidArgumentType (Type t)
 357                 {
 358                         if (t.IsArray)
 359                                 t = TypeManager.GetElementType (t);
 360
 361                         return t == TypeManager.string_type ||
 362                                 TypeManager.IsPrimitiveType (t) ||
 363                                 TypeManager.IsEnumType (t) ||
 364                                 t == TypeManager.object_type ||
 365                                 t == TypeManager.type_type;
 366                 }
 367
 368                 [Conditional ("GMCS_SOURCE")]
 369                 void ApplyModuleCharSet ()
 370                 {
 371                         if (Type != PredefinedAttributes.Get.DllImport)
 372                                 return;
 373
 374                         if (!RootContext.ToplevelTypes.HasDefaultCharSet)
 375                                 return;
 376
 377                         const string CharSetEnumMember = "CharSet";
 378                         if (NamedArguments == null) {
 379                                 NamedArguments = new ArrayList (1);
 380                         } else {
 381                                 foreach (DictionaryEntry de in NamedArguments) {
 382                                         if ((string)de.Key == CharSetEnumMember)
 383                                                 return;
 384                                 }
 385                         }
 386
 387                         NamedArguments.Add (new DictionaryEntry (CharSetEnumMember,
 388                                 new Argument (Constant.CreateConstant (typeof (CharSet), RootContext.ToplevelTypes.DefaultCharSet, Location))));
 389                 }
 390
 391                 public CustomAttributeBuilder Resolve ()
 392                 {
 393                         if (resolve_error)
 394                                 return null;
 395
 396                         resolve_error = true;
 397
 398                         if (Type == null) {
 399                                 ResolveAttributeType ();
 400                                 if (Type == null)
 401                                         return null;
 402                         }
 403
 404                         if (Type.IsAbstract) {
 405                                 Report.Error (653, Location, "Cannot apply attribute class `{0}' because it is abstract", GetSignatureForError ());
 406                                 return null;
 407                         }
 408
 409                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (Type);
 410                         if (obsolete_attr != null) {
 411                                 AttributeTester.Report_ObsoleteMessage (obsolete_attr, TypeManager.CSharpName (Type), Location);
 412                         }
 413
 414                         if (PosArguments == null && NamedArguments == null) {
 415                                 object o = att_cache [Type];
 416                                 if (o != null) {
 417                                         resolve_error = false;
 418                                         return (CustomAttributeBuilder)o;
 419                                 }
 420                         }
 421
 422                         Attributable owner = Owner;
 423                         DeclSpace ds = owner.ResolveContext as DeclSpace;
 424                         if (ds == null)
 425                                 ds = owner.ResolveContext.DeclContainer;
 426
 427                         EmitContext ec = new EmitContext (owner.ResolveContext, ds, ds,
 428                                 Location, null, typeof (Attribute), ds.ModFlags, false);
 429                         ec.IsAnonymousMethodAllowed = false;
 430
 431                         ConstructorInfo ctor = ResolveConstructor (ec);
 432                         if (ctor == null) {
 433                                 if (Type is TypeBuilder &&
 434                                     TypeManager.LookupDeclSpace (Type).MemberCache == null)
 435                                         // The attribute type has been DefineType'd, but not Defined.  Let's not treat it as an error.
 436                                         // It'll be resolved again when the attached-to entity is emitted.
 437                                         resolve_error = false;
 438                                 return null;
 439                         }
 440
 441                         ApplyModuleCharSet ();
 442
 443                         CustomAttributeBuilder cb;
 444                         try {
 445                                 // SRE does not allow private ctor but we want to report all source code errors
 446                                 if (ctor.IsPrivate)
 447                                         return null;
 448
 449                                 if (NamedArguments == null) {
 450                                         cb = new CustomAttributeBuilder (ctor, pos_values);
 451
 452                                         if (pos_values.Length == 0)
 453                                                 att_cache.Add (Type, cb);
 454
 455                                         resolve_error = false;
 456                                         return cb;
 457                                 }
 458
 459                                 if (!ResolveNamedArguments (ec)) {
 460                                         return null;
 461                                 }
 462
 463                                 cb = new CustomAttributeBuilder (ctor, pos_values,
 464                                                 prop_info_arr, prop_values_arr,
 465                                                 field_info_arr, field_values_arr);
 466
 467                                 resolve_error = false;
 468                                 return cb;
 469                         }
 470                         catch (Exception) {
 471                                 Error_AttributeArgumentNotValid (Location);
 472                                 return null;
 473                         }
 474                 }
 475
 476                 protected virtual ConstructorInfo ResolveConstructor (EmitContext ec)
 477                 {
 478                         if (PosArguments != null) {
 479                                 for (int i = 0; i < PosArguments.Count; i++) {
 480                                         Argument a = (Argument) PosArguments [i];
 481
 482                                         if (!a.Resolve (ec, Location))
 483                                                 return null;
 484                                 }
 485                         }
 486
 487                         MethodGroupExpr mg = MemberLookupFinal (ec, ec.ContainerType,
 488                                 Type, ConstructorInfo.ConstructorName, MemberTypes.Constructor,
 489                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 490                                 Location) as MethodGroupExpr;
 491
 492                         if (mg == null)
 493                                 throw new NotImplementedException ();
 494
 495                         mg = mg.OverloadResolve (ec, ref PosArguments, false, Location);
 496                         if (mg == null)
 497                                 return null;
 498
 499                         ConstructorInfo constructor = (ConstructorInfo)mg;
 500                         if (PosArguments == null) {
 501                                 pos_values = EmptyObject;
 502                                 return constructor;
 503                         }
 504
 505                         AParametersCollection pd = TypeManager.GetParameterData (constructor);
 506
 507                         int pos_arg_count = PosArguments.Count;
 508                         pos_values = new object [pos_arg_count];
 509                         for (int j = 0; j < pos_arg_count; ++j) {
 510                                 Argument a = (Argument) PosArguments [j];
 511
 512                                 if (!a.Expr.GetAttributableValue (ec, a.Type, out pos_values [j]))
 513                                         return null;
 514                         }
 515
 516                         // Here we do the checks which should be done by corlib or by runtime.
 517                         // However Zoltan doesn't like it and every Mono compiler has to do it again.
 518                         PredefinedAttributes pa = PredefinedAttributes.Get;
 519                         if (Type == pa.Guid) {
 520                                 try {
 521                                         new Guid ((string)pos_values [0]);
 522                                 }
 523                                 catch (Exception e) {
 524                                         Error_AttributeEmitError (e.Message);
 525                                         return null;
 526                                 }
 527                         }
 528
 529                         if (Type == pa.AttributeUsage && (int)pos_values [0] == 0) {
 530                                 Report.Error (591, Location, "Invalid value for argument to `System.AttributeUsage' attribute");
 531                                 return null;
 532                         }
 533
 534                         if (Type == pa.IndexerName || Type == pa.Conditional) {
 535                                 string v = pos_values [0] as string;
 536                                 if (!Tokenizer.IsValidIdentifier (v) || Tokenizer.IsKeyword (v)) {
 537                                         Report.Error (633, ((Argument)PosArguments[0]).Expr.Location,
 538                                                 "The argument to the `{0}' attribute must be a valid identifier", GetSignatureForError ());
 539                                         return null;
 540                                 }
 541                         }
 542
 543                         if (Type == pa.MethodImpl && pos_values.Length == 1 &&
 544                                 pd.Types [0] == TypeManager.short_type &&
 545                                 !System.Enum.IsDefined (typeof (MethodImplOptions), pos_values [0].ToString ())) {
 546                                 Error_AttributeEmitError ("Incorrect argument value.");
 547                                 return null;
 548                         }
 549
 550                         return constructor;
 551                 }
 552
 553                 protected virtual bool ResolveNamedArguments (EmitContext ec)
 554                 {
 555                         int named_arg_count = NamedArguments.Count;
 556
 557                         ArrayList field_infos = new ArrayList (named_arg_count);
 558                         ArrayList prop_infos  = new ArrayList (named_arg_count);
 559                         ArrayList field_values = new ArrayList (named_arg_count);
 560                         ArrayList prop_values = new ArrayList (named_arg_count);
 561
 562                         ArrayList seen_names = new ArrayList(named_arg_count);
 563
 564                         foreach (DictionaryEntry de in NamedArguments) {
 565                                 string member_name = (string) de.Key;
 566
 567                                 if (seen_names.Contains(member_name)) {
 568                                         Report.Error(643, Location, "'{0}' duplicate named attribute argument", member_name);
 569                                         return false;
 570                                 }
 571                                 seen_names.Add(member_name);
 572
 573                                 Argument a = (Argument) de.Value;
 574                                 if (!a.Resolve (ec, Location))
 575                                         return false;
 576
 577                                 Expression member = Expression.MemberLookup (
 578                                         ec.ContainerType, Type, member_name,
 579                                         MemberTypes.Field | MemberTypes.Property,
 580                                         BindingFlags.Public | BindingFlags.Instance,
 581                                         Location);
 582
 583                                 if (member == null) {
 584                                         member = Expression.MemberLookup (ec.ContainerType, Type, member_name,
 585                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 586                                                 Location);
 587
 588                                         if (member != null) {
 589                                                 Report.SymbolRelatedToPreviousError (member.Type);
 590                                                 Expression.ErrorIsInaccesible (Location, member.GetSignatureForError ());
 591                                                 return false;
 592                                         }
 593                                 }
 594
 595                                 if (member == null){
 596                                         Expression.Error_TypeDoesNotContainDefinition (Location, Type, member_name);
 597                                         return false;
 598                                 }
 599
 600                                 if (!(member is PropertyExpr || member is FieldExpr)) {
 601                                         Error_InvalidNamedArgument (member_name);
 602                                         return false;
 603                                 }
 604
 605                                 if (a.Expr is TypeParameterExpr){
 606                                         Error_TypeParameterInAttribute (Location);
 607                                         return false;
 608                                 }
 609
 610                                 ObsoleteAttribute obsolete_attr;
 611
 612                                 if (member is PropertyExpr) {
 613                                         PropertyInfo pi = ((PropertyExpr) member).PropertyInfo;
 614
 615                                         if (!pi.CanWrite || !pi.CanRead) {
 616                                                 Report.SymbolRelatedToPreviousError (pi);
 617                                                 Error_InvalidNamedArgument (member_name);
 618                                                 return false;
 619                                         }
 620
 621                                         if (!IsValidArgumentType (member.Type)) {
 622                                                 Report.SymbolRelatedToPreviousError (pi);
 623                                                 Error_InvalidNamedAgrumentType (member_name);
 624                                                 return false;
 625                                         }
 626
 627                                         object value;
 628                                         if (!a.Expr.GetAttributableValue (ec, member.Type, out value))
 629                                                 return false;
 630
 631                                         PropertyBase pb = TypeManager.GetProperty (pi);
 632                                         if (pb != null)
 633                                                 obsolete_attr = pb.GetObsoleteAttribute ();
 634                                         else
 635                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (pi);
 636
 637                                         prop_values.Add (value);
 638                                         prop_infos.Add (pi);
 639
 640                                 } else {
 641                                         FieldInfo fi = ((FieldExpr) member).FieldInfo;
 642
 643                                         if (fi.IsInitOnly) {
 644                                                 Error_InvalidNamedArgument (member_name);
 645                                                 return false;
 646                                         }
 647
 648                                         if (!IsValidArgumentType (member.Type)) {
 649                                                 Report.SymbolRelatedToPreviousError (fi);
 650                                                 Error_InvalidNamedAgrumentType (member_name);
 651                                                 return false;
 652                                         }
 653
 654                                         object value;
 655                                         if (!a.Expr.GetAttributableValue (ec, member.Type, out value))
 656                                                 return false;
 657
 658                                         FieldBase fb = TypeManager.GetField (fi);
 659                                         if (fb != null)
 660                                                 obsolete_attr = fb.GetObsoleteAttribute ();
 661                                         else
 662                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (fi);
 663
 664                                         field_values.Add (value);
 665                                         field_infos.Add (fi);
 666                                 }
 667
 668                                 if (obsolete_attr != null && !Owner.ResolveContext.IsInObsoleteScope)
 669                                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, member.GetSignatureForError (), member.Location);
 670                         }
 671
 672                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 673                         field_info_arr = new FieldInfo [field_infos.Count];
 674                         field_values_arr = new object [field_values.Count];
 675                         prop_values_arr = new object [prop_values.Count];
 676
 677                         field_infos.CopyTo  (field_info_arr, 0);
 678                         field_values.CopyTo (field_values_arr, 0);
 679
 680                         prop_values.CopyTo  (prop_values_arr, 0);
 681                         prop_infos.CopyTo   (prop_info_arr, 0);
 682
 683                         return true;
 684                 }
 685
 686                 /// <summary>
 687                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 688                 /// </summary>
 689                 public string GetValidTargets ()
 690                 {
 691                         StringBuilder sb = new StringBuilder ();
 692                         AttributeTargets targets = GetAttributeUsage (Type).ValidOn;
 693
 694                         if ((targets & AttributeTargets.Assembly) != 0)
 695                                 sb.Append ("assembly, ");
 696
 697                         if ((targets & AttributeTargets.Module) != 0)
 698                                 sb.Append ("module, ");
 699
 700                         if ((targets & AttributeTargets.Class) != 0)
 701                                 sb.Append ("class, ");
 702
 703                         if ((targets & AttributeTargets.Struct) != 0)
 704                                 sb.Append ("struct, ");
 705
 706                         if ((targets & AttributeTargets.Enum) != 0)
 707                                 sb.Append ("enum, ");
 708
 709                         if ((targets & AttributeTargets.Constructor) != 0)
 710                                 sb.Append ("constructor, ");
 711
 712                         if ((targets & AttributeTargets.Method) != 0)
 713                                 sb.Append ("method, ");
 714
 715                         if ((targets & AttributeTargets.Property) != 0)
 716                                 sb.Append ("property, indexer, ");
 717
 718                         if ((targets & AttributeTargets.Field) != 0)
 719                                 sb.Append ("field, ");
 720
 721                         if ((targets & AttributeTargets.Event) != 0)
 722                                 sb.Append ("event, ");
 723
 724                         if ((targets & AttributeTargets.Interface) != 0)
 725                                 sb.Append ("interface, ");
 726
 727                         if ((targets & AttributeTargets.Parameter) != 0)
 728                                 sb.Append ("parameter, ");
 729
 730                         if ((targets & AttributeTargets.Delegate) != 0)
 731                                 sb.Append ("delegate, ");
 732
 733                         if ((targets & AttributeTargets.ReturnValue) != 0)
 734                                 sb.Append ("return, ");
 735
 736 #if NET_2_0
 737                         if ((targets & AttributeTargets.GenericParameter) != 0)
 738                                 sb.Append ("type parameter, ");
 739 #endif
 740                         return sb.Remove (sb.Length - 2, 2).ToString ();
 741                 }
 742
 743                 /// <summary>
 744                 /// Returns AttributeUsage attribute based on types hierarchy
 745                 /// </summary>
 746                 static AttributeUsageAttribute GetAttributeUsage (Type type)
 747                 {
 748                         AttributeUsageAttribute ua = usage_attr_cache [type] as AttributeUsageAttribute;
 749                         if (ua != null)
 750                                 return ua;
 751
 752                         Class attr_class = TypeManager.LookupClass (type);
 753                         PredefinedAttribute pa = PredefinedAttributes.Get.AttributeUsage;
 754
 755                         if (attr_class == null) {
 756                                 if (!pa.IsDefined)
 757                                         return new AttributeUsageAttribute (0);
 758
 759                                 object[] usage_attr = type.GetCustomAttributes (pa.Type, true);
 760                                 ua = (AttributeUsageAttribute)usage_attr [0];
 761                                 usage_attr_cache.Add (type, ua);
 762                                 return ua;
 763                         }
 764
 765                         Attribute a = null;
 766                         if (attr_class.OptAttributes != null)
 767                                 a = attr_class.OptAttributes.Search (pa);
 768
 769                         if (a == null) {
 770                                 if (attr_class.TypeBuilder.BaseType != TypeManager.attribute_type)
 771                                         ua = GetAttributeUsage (attr_class.TypeBuilder.BaseType);
 772                                 else
 773                                         ua = DefaultUsageAttribute;
 774                         } else {
 775                                 ua = a.GetAttributeUsageAttribute ();
 776                         }
 777
 778                         usage_attr_cache.Add (type, ua);
 779                         return ua;
 780                 }
 781
 782                 AttributeUsageAttribute GetAttributeUsageAttribute ()
 783                 {
 784                         if (pos_values == null)
 785                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 786                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 787                                 Resolve ();
 788
 789                         if (resolve_error)
 790                                 return DefaultUsageAttribute;
 791
 792                         AttributeUsageAttribute usage_attribute = new AttributeUsageAttribute ((AttributeTargets)pos_values [0]);
 793
 794                         object field = GetPropertyValue ("AllowMultiple");
 795                         if (field != null)
 796                                 usage_attribute.AllowMultiple = (bool)field;
 797
 798                         field = GetPropertyValue ("Inherited");
 799                         if (field != null)
 800                                 usage_attribute.Inherited = (bool)field;
 801
 802                         return usage_attribute;
 803                 }
 804
 805                 /// <summary>
 806                 /// Returns custom name of indexer
 807                 /// </summary>
 808                 public string GetIndexerAttributeValue ()
 809                 {
 810                         if (pos_values == null)
 811                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 812                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 813                                 Resolve ();
 814
 815                         if (resolve_error)
 816                                 return null;
 817
 818                         return pos_values [0] as string;
 819                 }
 820
 821                 /// <summary>
 822                 /// Returns condition of ConditionalAttribute
 823                 /// </summary>
 824                 public string GetConditionalAttributeValue ()
 825                 {
 826                         if (pos_values == null)
 827                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 828                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 829                                 Resolve ();
 830
 831                         if (resolve_error)
 832                                 return null;
 833
 834                         return (string)pos_values [0];
 835                 }
 836
 837                 /// <summary>
 838                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 839                 /// </summary>
 840                 public ObsoleteAttribute GetObsoleteAttribute ()
 841                 {
 842                         if (pos_values == null)
 843                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 844                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 845                                 Resolve ();
 846
 847                         if (resolve_error)
 848                                 return null;
 849
 850                         if (pos_values == null || pos_values.Length == 0)
 851                                 return new ObsoleteAttribute ();
 852
 853                         if (pos_values.Length == 1)
 854                                 return new ObsoleteAttribute ((string)pos_values [0]);
 855
 856                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 857                 }
 858
 859                 /// <summary>
 860                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 861                 /// before ApplyAttribute. We need to resolve the arguments.
 862                 /// This situation occurs when class deps is differs from Emit order.
 863                 /// </summary>
 864                 public bool GetClsCompliantAttributeValue ()
 865                 {
 866                         if (pos_values == null)
 867                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 868                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 869                                 Resolve ();
 870
 871                         if (resolve_error)
 872                                 return false;
 873
 874                         return (bool)pos_values [0];
 875                 }
 876
 877                 public Type GetCoClassAttributeValue ()
 878                 {
 879                         if (pos_values == null)
 880                                 Resolve ();
 881
 882                         if (resolve_error)
 883                                 return null;
 884
 885                         return (Type)pos_values [0];
 886                 }
 887
 888                 public bool CheckTarget ()
 889                 {
 890                         string[] valid_targets = Owner.ValidAttributeTargets;
 891                         if (ExplicitTarget == null || ExplicitTarget == valid_targets [0]) {
 892                                 Target = Owner.AttributeTargets;
 893                                 return true;
 894                         }
 895
 896                         // TODO: we can skip the first item
 897                         if (((IList) valid_targets).Contains (ExplicitTarget)) {
 898                                 switch (ExplicitTarget) {
 899                                 case "return": Target = AttributeTargets.ReturnValue; return true;
 900                                 case "param": Target = AttributeTargets.Parameter; return true;
 901                                 case "field": Target = AttributeTargets.Field; return true;
 902                                 case "method": Target = AttributeTargets.Method; return true;
 903                                 case "property": Target = AttributeTargets.Property; return true;
 904                                 }
 905                                 throw new InternalErrorException ("Unknown explicit target: " + ExplicitTarget);
 906                         }
 907
 908                         StringBuilder sb = new StringBuilder ();
 909                         foreach (string s in valid_targets) {
 910                                 sb.Append (s);
 911                                 sb.Append (", ");
 912                         }
 913                         sb.Remove (sb.Length - 2, 2);
 914                         Report.Error (657, Location, "`{0}' is not a valid attribute location for this declaration. " +
 915                                 "Valid attribute locations for this declaration are `{1}'", ExplicitTarget, sb.ToString ());
 916                         return false;
 917                 }
 918
 919                 /// <summary>
 920                 /// Tests permitted SecurityAction for assembly or other types
 921                 /// </summary>
 922                 protected virtual bool IsSecurityActionValid (bool for_assembly)
 923                 {
 924                         SecurityAction action = GetSecurityActionValue ();
 925
 926                         switch (action) {
 927                         case SecurityAction.Demand:
 928                         case SecurityAction.Assert:
 929                         case SecurityAction.Deny:
 930                         case SecurityAction.PermitOnly:
 931                         case SecurityAction.LinkDemand:
 932                         case SecurityAction.InheritanceDemand:
 933                                 if (!for_assembly)
 934                                         return true;
 935                                 break;
 936
 937                         case SecurityAction.RequestMinimum:
 938                         case SecurityAction.RequestOptional:
 939                         case SecurityAction.RequestRefuse:
 940                                 if (for_assembly)
 941                                         return true;
 942                                 break;
 943
 944                         default:
 945                                 Error_AttributeEmitError ("SecurityAction is out of range");
 946                                 return false;
 947                         }
 948
 949                         Error_AttributeEmitError (String.Concat ("SecurityAction `", action, "' is not valid for this declaration"));
 950                         return false;
 951                 }
 952
 953                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 954                 {
 955                         return (SecurityAction)pos_values [0];
 956                 }
 957
 958                 /// <summary>
 959                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 960                 /// </summary>
 961                 /// <returns></returns>
 962                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 963                 {
 964                         Type orig_assembly_type = null;
 965
 966                         if (TypeManager.LookupDeclSpace (Type) != null) {
 967                                 if (!RootContext.StdLib) {
 968                                         orig_assembly_type = Type.GetType (Type.FullName);
 969                                 } else {
 970                                         string orig_version_path = Environment.GetEnvironmentVariable ("__SECURITY_BOOTSTRAP_DB");
 971                                         if (orig_version_path == null) {
 972                                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 973                                                 return;
 974                                         }
 975
 976                                         if (orig_sec_assembly == null) {
 977                                                 string file = Path.Combine (orig_version_path, Driver.OutputFile);
 978                                                 orig_sec_assembly = Assembly.LoadFile (file);
 979                                         }
 980
 981                                         orig_assembly_type = orig_sec_assembly.GetType (Type.FullName, true);
 982                                         if (orig_assembly_type == null) {
 983                                                 Report.Warning (-112, 1, Location, "Self-referenced security attribute `{0}' " +
 984                                                                 "was not found in previous version of assembly");
 985                                                 return;
 986                                         }
 987                                 }
 988                         }
 989
 990                         SecurityAttribute sa;
 991                         // For all non-selfreferencing security attributes we can avoid all hacks
 992                         if (orig_assembly_type == null) {
 993                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 994
 995                                 if (prop_info_arr != null) {
 996                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 997                                                 PropertyInfo pi = prop_info_arr [i];
 998                                                 pi.SetValue (sa, prop_values_arr [i], null);
 999                                         }
1000                                 }
1001                         } else {
1002                                 // HACK: All security attributes have same ctor syntax
1003                                 sa = (SecurityAttribute) Activator.CreateInstance (orig_assembly_type, new object[] { GetSecurityActionValue () } );
1004
1005                                 // All types are from newly created assembly but for invocation with old one we need to convert them
1006                                 if (prop_info_arr != null) {
1007                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
1008                                                 PropertyInfo emited_pi = prop_info_arr [i];
1009                                                 // FIXME: We are missing return type filter
1010                                                 // TODO: pi can be null
1011                                                 PropertyInfo pi = orig_assembly_type.GetProperty (emited_pi.Name);
1012
1013                                                 object old_instance = TypeManager.IsEnumType (pi.PropertyType) ?
1014                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
1015                                                         prop_values_arr [i];
1016
1017                                                 pi.SetValue (sa, old_instance, null);
1018                                         }
1019                                 }
1020                         }
1021
1022                         IPermission perm;
1023                         perm = sa.CreatePermission ();
1024                         SecurityAction action = GetSecurityActionValue ();
1025
1026                         // IS is correct because for corlib we are using an instance from old corlib
1027                         if (!(perm is System.Security.CodeAccessPermission)) {
1028                                 switch (action) {
1029                                 case SecurityAction.Demand:
1030                                         action = (SecurityAction)13;
1031                                         break;
1032                                 case SecurityAction.LinkDemand:
1033                                         action = (SecurityAction)14;
1034                                         break;
1035                                 case SecurityAction.InheritanceDemand:
1036                                         action = (SecurityAction)15;
1037                                         break;
1038                                 }
1039                         }
1040
1041                         PermissionSet ps = (PermissionSet)permissions [action];
1042                         if (ps == null) {
1043                                 if (sa is PermissionSetAttribute)
1044                                         ps = new PermissionSet (sa.Unrestricted ? PermissionState.Unrestricted : PermissionState.None);
1045                                 else
1046                                         ps = new PermissionSet (PermissionState.None);
1047
1048                                 permissions.Add (action, ps);
1049                         } else if (!ps.IsUnrestricted () && (sa is PermissionSetAttribute) && sa.Unrestricted) {
1050                                 ps = ps.Union (new PermissionSet (PermissionState.Unrestricted));
1051                                 permissions [action] = ps;
1052                         }
1053                         ps.AddPermission (perm);
1054                 }
1055
1056                 public object GetPropertyValue (string name)
1057                 {
1058                         if (prop_info_arr == null)
1059                                 return null;
1060
1061                         for (int i = 0; i < prop_info_arr.Length; ++i) {
1062                                 if (prop_info_arr [i].Name == name)
1063                                         return prop_values_arr [i];
1064                         }
1065
1066                         return null;
1067                 }
1068
1069                 //
1070                 // Theoretically, we can get rid of this, since FieldBuilder.SetCustomAttribute()
1071                 // and ParameterBuilder.SetCustomAttribute() are supposed to handle this attribute.
1072                 // However, we can't, since it appears that the .NET 1.1 SRE hangs when given a MarshalAsAttribute.
1073                 //
1074 #if !NET_2_0
1075                 public UnmanagedMarshal GetMarshal (Attributable attr)
1076                 {
1077                         UnmanagedType UnmanagedType;
1078                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (UnmanagedType))
1079                                 UnmanagedType = (UnmanagedType) System.Enum.ToObject (typeof (UnmanagedType), pos_values [0]);
1080                         else
1081                                 UnmanagedType = (UnmanagedType) pos_values [0];
1082
1083                         object value = GetFieldValue ("SizeParamIndex");
1084                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
1085                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
1086                                 return null;
1087                         }
1088
1089                         object o = GetFieldValue ("ArraySubType");
1090                         UnmanagedType array_sub_type = o == null ? (UnmanagedType) 0x50 /* NATIVE_MAX */ : (UnmanagedType) o;
1091
1092                         switch (UnmanagedType) {
1093                         case UnmanagedType.CustomMarshaler: {
1094                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
1095                                         BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1096                                 if (define_custom == null) {
1097                                         Report.RuntimeMissingSupport (Location, "set marshal info");
1098                                         return null;
1099                                 }
1100
1101                                 object [] args = new object [4];
1102                                 args [0] = GetFieldValue ("MarshalTypeRef");
1103                                 args [1] = GetFieldValue ("MarshalCookie");
1104                                 args [2] = GetFieldValue ("MarshalType");
1105                                 args [3] = Guid.Empty;
1106                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
1107                         }
1108                         case UnmanagedType.LPArray: {
1109                                 object size_const = GetFieldValue ("SizeConst");
1110                                 object size_param_index = GetFieldValue ("SizeParamIndex");
1111
1112                                 if ((size_const != null) || (size_param_index != null)) {
1113                                         MethodInfo define_array = typeof (UnmanagedMarshal).GetMethod ("DefineLPArrayInternal",
1114                                                 BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1115                                         if (define_array == null) {
1116                                                 Report.RuntimeMissingSupport (Location, "set marshal info");
1117                                                 return null;
1118                                         }
1119
1120                                         object [] args = new object [3];
1121                                         args [0] = array_sub_type;
1122                                         args [1] = size_const == null ? -1 : size_const;
1123                                         args [2] = size_param_index == null ? -1 : size_param_index;
1124                                         return (UnmanagedMarshal) define_array.Invoke (null, args);
1125                                 }
1126                                 else
1127                                         return UnmanagedMarshal.DefineLPArray (array_sub_type);
1128                         }
1129                         case UnmanagedType.SafeArray:
1130                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
1131
1132                         case UnmanagedType.ByValArray:
1133                                 FieldBase fm = attr as FieldBase;
1134                                 if (fm == null) {
1135                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
1136                                         return null;
1137                                 }
1138                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
1139
1140                         case UnmanagedType.ByValTStr:
1141                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
1142
1143                         default:
1144                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
1145                         }
1146                 }
1147
1148                 object GetFieldValue (string name)
1149                 {
1150                         int i;
1151                         if (field_info_arr == null)
1152                                 return null;
1153                         i = 0;
1154                         foreach (FieldInfo fi in field_info_arr) {
1155                                 if (fi.Name == name)
1156                                         return GetValue (field_values_arr [i]);
1157                                 i++;
1158                         }
1159                         return null;
1160                 }
1161
1162                 static object GetValue (object value)
1163                 {
1164                         if (value is EnumConstant)
1165                                 return ((EnumConstant) value).GetValue ();
1166                         else
1167                                 return value;
1168                 }
1169
1170 #endif
1171
1172                 public CharSet GetCharSetValue ()
1173                 {
1174                         return (CharSet)System.Enum.Parse (typeof (CharSet), pos_values [0].ToString ());
1175                 }
1176
1177                 public bool HasField (string fieldName)
1178                 {
1179                         if (field_info_arr == null)
1180                                 return false;
1181
1182                         foreach (FieldInfo fi in field_info_arr) {
1183                                 if (fi.Name == fieldName)
1184                                         return true;
1185                         }
1186
1187                         return false;
1188                 }
1189
1190                 public bool IsInternalMethodImplAttribute {
1191                         get {
1192                                 if (Type != PredefinedAttributes.Get.MethodImpl)
1193                                         return false;
1194
1195                                 MethodImplOptions options;
1196                                 if (pos_values[0].GetType () != typeof (MethodImplOptions))
1197                                         options = (MethodImplOptions)System.Enum.ToObject (typeof (MethodImplOptions), pos_values[0]);
1198                                 else
1199                                         options = (MethodImplOptions)pos_values[0];
1200
1201                                 return (options & MethodImplOptions.InternalCall) != 0;
1202                         }
1203                 }
1204
1205                 public LayoutKind GetLayoutKindValue ()
1206                 {
1207                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (LayoutKind))
1208                                 return (LayoutKind)System.Enum.ToObject (typeof (LayoutKind), pos_values [0]);
1209
1210                         return (LayoutKind)pos_values [0];
1211                 }
1212
1213                 public object GetParameterDefaultValue ()
1214                 {
1215                         return pos_values [0];
1216                 }
1217
1218                 public override bool Equals (object obj)
1219                 {
1220                         Attribute a = obj as Attribute;
1221                         if (a == null)
1222                                 return false;
1223
1224                         return Type == a.Type && Target == a.Target;
1225                 }
1226
1227                 public override int GetHashCode ()
1228                 {
1229                         return base.GetHashCode ();
1230                 }
1231
1232                 /// <summary>
1233                 /// Emit attribute for Attributable symbol
1234                 /// </summary>
1235                 public void Emit (ListDictionary allEmitted)
1236                 {
1237                         CustomAttributeBuilder cb = Resolve ();
1238                         if (cb == null)
1239                                 return;
1240
1241                         AttributeUsageAttribute usage_attr = GetAttributeUsage (Type);
1242                         if ((usage_attr.ValidOn & Target) == 0) {
1243                                 Report.Error (592, Location, "The attribute `{0}' is not valid on this declaration type. " +
1244                                               "It is valid on `{1}' declarations only",
1245                                         GetSignatureForError (), GetValidTargets ());
1246                                 return;
1247                         }
1248
1249                         try {
1250                                 foreach (Attributable owner in owners)
1251                                         owner.ApplyAttributeBuilder (this, cb, PredefinedAttributes.Get);
1252                         }
1253                         catch (Exception e) {
1254                                 Error_AttributeEmitError (e.Message);
1255                                 return;
1256                         }
1257
1258                         if (!usage_attr.AllowMultiple && allEmitted != null) {
1259                                 if (allEmitted.Contains (this)) {
1260                                         ArrayList a = allEmitted [this] as ArrayList;
1261                                         if (a == null) {
1262                                                 a = new ArrayList (2);
1263                                                 allEmitted [this] = a;
1264                                         }
1265                                         a.Add (this);
1266                                 } else {
1267                                         allEmitted.Add (this, null);
1268                                 }
1269                         }
1270
1271                         if (!RootContext.VerifyClsCompliance)
1272                                 return;
1273
1274                         // Here we are testing attribute arguments for array usage (error 3016)
1275                         if (Owner.IsClsComplianceRequired ()) {
1276                                 if (PosArguments != null) {
1277                                         foreach (Argument arg in PosArguments) {
1278                                                 // Type is undefined (was error 246)
1279                                                 if (arg.Type == null)
1280                                                         return;
1281
1282                                                 if (arg.Type.IsArray) {
1283                                                         Report.Warning (3016, 1, Location, "Arrays as attribute arguments are not CLS-compliant");
1284                                                         return;
1285                                                 }
1286                                         }
1287                                 }
1288
1289                                 if (NamedArguments == null)
1290                                         return;
1291
1292                                 foreach (DictionaryEntry de in NamedArguments) {
1293                                         Argument arg  = (Argument) de.Value;
1294
1295                                         // Type is undefined (was error 246)
1296                                         if (arg.Type == null)
1297                                                 return;
1298
1299                                         if (arg.Type.IsArray) {
1300                                                 Report.Warning (3016, 1, Location, "Arrays as attribute arguments are not CLS-compliant");
1301                                                 return;
1302                                         }
1303                                 }
1304                         }
1305                 }
1306
1307                 private Expression GetValue ()
1308                 {
1309                         if (PosArguments == null || PosArguments.Count < 1)
1310                                 return null;
1311
1312                         return ((Argument) PosArguments [0]).Expr;
1313                 }
1314
1315                 public string GetString ()
1316                 {
1317                         Expression e = GetValue ();
1318                         if (e is StringConstant)
1319                                 return ((StringConstant)e).Value;
1320                         return null;
1321                 }
1322
1323                 public bool GetBoolean ()
1324                 {
1325                         Expression e = GetValue ();
1326                         if (e is BoolConstant)
1327                                 return ((BoolConstant)e).Value;
1328                         return false;
1329                 }
1330
1331                 public Type GetArgumentType ()
1332                 {
1333                         TypeOf e = GetValue () as TypeOf;
1334                         if (e == null)
1335                                 return null;
1336                         return e.TypeArgument;
1337                 }
1338
1339                 public override Expression CreateExpressionTree (EmitContext ec)
1340                 {
1341                         throw new NotSupportedException ("ET");
1342                 }
1343
1344                 public override Expression DoResolve (EmitContext ec)
1345                 {
1346                         throw new NotImplementedException ();
1347                 }
1348
1349                 public override void Emit (EmitContext ec)
1350                 {
1351                         throw new NotImplementedException ();
1352                 }
1353         }
1354
1355
1356         /// <summary>
1357         /// For global attributes (assembly, module) we need special handling.
1358         /// Attributes can be located in the several files
1359         /// </summary>
1360         public class GlobalAttribute : Attribute
1361         {
1362                 public readonly NamespaceEntry ns;
1363
1364                 public GlobalAttribute (NamespaceEntry ns, string target,
1365                                         Expression left_expr, string identifier, object[] args, Location loc, bool nameEscaped):
1366                         base (target, left_expr, identifier, args, loc, nameEscaped)
1367                 {
1368                         this.ns = ns;
1369                         this.owners = new Attributable[1];
1370                 }
1371
1372                 public override void AttachTo (Attributable owner)
1373                 {
1374                         if (ExplicitTarget == "assembly") {
1375                                 owners [0] = CodeGen.Assembly;
1376                                 return;
1377                         }
1378                         if (ExplicitTarget == "module") {
1379                                 owners [0] = RootContext.ToplevelTypes;
1380                                 return;
1381                         }
1382                         throw new NotImplementedException ("Unknown global explicit target " + ExplicitTarget);
1383                 }
1384
1385                 void Enter ()
1386                 {
1387                         // RootContext.ToplevelTypes has a single NamespaceEntry which gets overwritten
1388                         // each time a new file is parsed.  However, we need to use the NamespaceEntry
1389                         // in effect where the attribute was used.  Since code elsewhere cannot assume
1390                         // that the NamespaceEntry is right, just overwrite it.
1391                         //
1392                         // Precondition: RootContext.ToplevelTypes == null
1393
1394                         if (RootContext.ToplevelTypes.NamespaceEntry != null)
1395                                 throw new InternalErrorException (Location + " non-null NamespaceEntry");
1396
1397                         RootContext.ToplevelTypes.NamespaceEntry = ns;
1398                 }
1399
1400                 protected override bool IsSecurityActionValid (bool for_assembly)
1401                 {
1402                         return base.IsSecurityActionValid (true);
1403                 }
1404
1405                 void Leave ()
1406                 {
1407                         RootContext.ToplevelTypes.NamespaceEntry = null;
1408                 }
1409
1410                 protected override TypeExpr ResolveAsTypeTerminal (Expression expr, IResolveContext ec, bool silent)
1411                 {
1412                         try {
1413                                 Enter ();
1414                                 return base.ResolveAsTypeTerminal (expr, ec, silent);
1415                         }
1416                         finally {
1417                                 Leave ();
1418                         }
1419                 }
1420
1421                 protected override ConstructorInfo ResolveConstructor (EmitContext ec)
1422                 {
1423                         try {
1424                                 Enter ();
1425                                 return base.ResolveConstructor (ec);
1426                         }
1427                         finally {
1428                                 Leave ();
1429                         }
1430                 }
1431
1432                 protected override bool ResolveNamedArguments (EmitContext ec)
1433                 {
1434                         try {
1435                                 Enter ();
1436                                 return base.ResolveNamedArguments (ec);
1437                         }
1438                         finally {
1439                                 Leave ();
1440                         }
1441                 }
1442         }
1443
1444         public class Attributes {
1445                 public readonly ArrayList Attrs;
1446
1447                 public Attributes (Attribute a)
1448                 {
1449                         Attrs = new ArrayList ();
1450                         Attrs.Add (a);
1451                 }
1452
1453                 public Attributes (ArrayList attrs)
1454                 {
1455                         Attrs = attrs;
1456                 }
1457
1458                 public void AddAttributes (ArrayList attrs)
1459                 {
1460                         Attrs.AddRange (attrs);
1461                 }
1462
1463                 public void AttachTo (Attributable attributable)
1464                 {
1465                         foreach (Attribute a in Attrs)
1466                                 a.AttachTo (attributable);
1467                 }
1468
1469                 public Attributes Clone ()
1470                 {
1471                         ArrayList al = new ArrayList (Attrs.Count);
1472                         foreach (Attribute a in Attrs)
1473                                 al.Add (a.Clone ());
1474
1475                         return new Attributes (al);
1476                 }
1477
1478                 /// <summary>
1479                 /// Checks whether attribute target is valid for the current element
1480                 /// </summary>
1481                 public bool CheckTargets ()
1482                 {
1483                         foreach (Attribute a in Attrs) {
1484                                 if (!a.CheckTarget ())
1485                                         return false;
1486                         }
1487                         return true;
1488                 }
1489
1490                 public Attribute Search (PredefinedAttribute t)
1491                 {
1492                         foreach (Attribute a in Attrs) {
1493                                 if (a.ResolveType () == t)
1494                                         return a;
1495                         }
1496                         return null;
1497                 }
1498
1499                 /// <summary>
1500                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1501                 /// </summary>
1502                 public Attribute[] SearchMulti (PredefinedAttribute t)
1503                 {
1504                         ArrayList ar = null;
1505
1506                         foreach (Attribute a in Attrs) {
1507                                 if (a.ResolveType () == t) {
1508                                         if (ar == null)
1509                                                 ar = new ArrayList ();
1510                                         ar.Add (a);
1511                                 }
1512                         }
1513
1514                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1515                 }
1516
1517                 public void Emit ()
1518                 {
1519                         CheckTargets ();
1520
1521                         ListDictionary ld = Attrs.Count > 1 ? new ListDictionary () : null;
1522
1523                         foreach (Attribute a in Attrs)
1524                                 a.Emit (ld);
1525
1526                         if (ld == null || ld.Count == 0)
1527                                 return;
1528
1529                         foreach (DictionaryEntry d in ld) {
1530                                 if (d.Value == null)
1531                                         continue;
1532
1533                                 foreach (Attribute collision in (ArrayList)d.Value)
1534                                         Report.SymbolRelatedToPreviousError (collision.Location, "");
1535
1536                                 Attribute a = (Attribute)d.Key;
1537                                 Report.Error (579, a.Location, "The attribute `{0}' cannot be applied multiple times",
1538                                         a.GetSignatureForError ());
1539                         }
1540                 }
1541
1542                 public bool Contains (PredefinedAttribute t)
1543                 {
1544                         return Search (t) != null;
1545                 }
1546         }
1547
1548         /// <summary>
1549         /// Helper class for attribute verification routine.
1550         /// </summary>
1551         sealed class AttributeTester
1552         {
1553                 static PtrHashtable analyzed_types;
1554                 static PtrHashtable analyzed_types_obsolete;
1555                 static PtrHashtable analyzed_member_obsolete;
1556                 static PtrHashtable analyzed_method_excluded;
1557                 static PtrHashtable fixed_buffer_cache;
1558
1559                 static object TRUE = new object ();
1560                 static object FALSE = new object ();
1561
1562                 static AttributeTester ()
1563                 {
1564                         Reset ();
1565                 }
1566
1567                 private AttributeTester ()
1568                 {
1569                 }
1570
1571                 public static void Reset ()
1572                 {
1573                         analyzed_types = new PtrHashtable ();
1574                         analyzed_types_obsolete = new PtrHashtable ();
1575                         analyzed_member_obsolete = new PtrHashtable ();
1576                         analyzed_method_excluded = new PtrHashtable ();
1577                         fixed_buffer_cache = new PtrHashtable ();
1578                 }
1579
1580                 public enum Result {
1581                         Ok,
1582                         RefOutArrayError,
1583                         ArrayArrayError
1584                 }
1585
1586                 /// <summary>
1587                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1588                 /// It tests differing only in ref or out, or in array rank.
1589                 /// </summary>
1590                 public static Result AreOverloadedMethodParamsClsCompliant (AParametersCollection pa, AParametersCollection pb)
1591                 {
1592                         Type [] types_a = pa.Types;
1593                         Type [] types_b = pb.Types;
1594                         if (types_a == null || types_b == null)
1595                                 return Result.Ok;
1596
1597                         if (types_a.Length != types_b.Length)
1598                                 return Result.Ok;
1599
1600                         Result result = Result.Ok;
1601                         for (int i = 0; i < types_b.Length; ++i) {
1602                                 Type aType = types_a [i];
1603                                 Type bType = types_b [i];
1604
1605                                 if (aType.IsArray && bType.IsArray) {
1606                                         Type a_el_type = TypeManager.GetElementType (aType);
1607                                         Type b_el_type = TypeManager.GetElementType (bType);
1608                                         if (aType.GetArrayRank () != bType.GetArrayRank () && a_el_type == b_el_type) {
1609                                                 result = Result.RefOutArrayError;
1610                                                 continue;
1611                                         }
1612
1613                                         if (a_el_type.IsArray || b_el_type.IsArray) {
1614                                                 result = Result.ArrayArrayError;
1615                                                 continue;
1616                                         }
1617                                 }
1618
1619                                 if (aType != bType)
1620                                         return Result.Ok;
1621
1622                                 const Parameter.Modifier out_ref_mod = (Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK);
1623                                 if ((pa.FixedParameters[i].ModFlags & out_ref_mod) != (pb.FixedParameters[i].ModFlags & out_ref_mod))
1624                                         result = Result.RefOutArrayError;
1625                         }
1626                         return result;
1627                 }
1628
1629                 /// <summary>
1630                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1631                 /// </summary>
1632                 public static bool IsClsCompliant (Type type)
1633                 {
1634                         if (type == null)
1635                                 return true;
1636
1637                         object type_compliance = analyzed_types[type];
1638                         if (type_compliance != null)
1639                                 return type_compliance == TRUE;
1640
1641                         if (type.IsPointer) {
1642                                 analyzed_types.Add (type, FALSE);
1643                                 return false;
1644                         }
1645
1646                         bool result;
1647                         if (type.IsArray) {
1648                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1649                         } else if (TypeManager.IsNullableType (type)) {
1650                                 result = IsClsCompliant (TypeManager.GetTypeArguments (type) [0]);
1651                         } else {
1652                                 result = AnalyzeTypeCompliance (type);
1653                         }
1654                         analyzed_types.Add (type, result ? TRUE : FALSE);
1655                         return result;
1656                 }
1657
1658                 /// <summary>
1659                 /// Returns IFixedBuffer implementation if field is fixed buffer else null.
1660                 /// </summary>
1661                 public static IFixedBuffer GetFixedBuffer (FieldInfo fi)
1662                 {
1663                         // Fixed buffer helper type is generated as value type
1664                         if (TypeManager.IsReferenceType (fi.FieldType))
1665                                 return null;
1666
1667                         FieldBase fb = TypeManager.GetField (fi);
1668                         if (fb != null) {
1669                                 return fb as IFixedBuffer;
1670                         }
1671
1672                         if (TypeManager.GetConstant (fi) != null)
1673                                 return null;
1674
1675                         object o = fixed_buffer_cache [fi];
1676                         if (o == null) {
1677                                 PredefinedAttribute pa = PredefinedAttributes.Get.FixedBuffer;
1678                                 if (!pa.IsDefined)
1679                                         return null;
1680
1681                                 if (!fi.IsDefined (pa.Type, false)) {
1682                                         fixed_buffer_cache.Add (fi, FALSE);
1683                                         return null;
1684                                 }
1685
1686                                 IFixedBuffer iff = new FixedFieldExternal (fi);
1687                                 fixed_buffer_cache.Add (fi, iff);
1688                                 return iff;
1689                         }
1690
1691                         if (o == FALSE)
1692                                 return null;
1693
1694                         return (IFixedBuffer)o;
1695                 }
1696
1697                 public static void VerifyModulesClsCompliance ()
1698                 {
1699                         Module[] modules = GlobalRootNamespace.Instance.Modules;
1700                         if (modules == null)
1701                                 return;
1702
1703                         // The first module is generated assembly
1704                         for (int i = 1; i < modules.Length; ++i) {
1705                                 Module module = modules [i];
1706                                 if (!GetClsCompliantAttributeValue (module, null)) {
1707                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute " +
1708                                                       "to match the assembly", module.Name);
1709                                         return;
1710                                 }
1711                         }
1712                 }
1713
1714                 public static Type GetImportedIgnoreCaseClsType (string name)
1715                 {
1716                         foreach (Assembly a in GlobalRootNamespace.Instance.Assemblies) {
1717                                 Type t = a.GetType (name, false, true);
1718                                 if (t == null)
1719                                         continue;
1720
1721                                 if (IsClsCompliant (t))
1722                                         return t;
1723                         }
1724                         return null;
1725                 }
1726
1727                 static bool GetClsCompliantAttributeValue (ICustomAttributeProvider attribute_provider, Assembly a)
1728                 {
1729                         PredefinedAttribute pa = PredefinedAttributes.Get.CLSCompliant;
1730                         if (!pa.IsDefined)
1731                                 return false;
1732
1733                         object[] cls_attr = attribute_provider.GetCustomAttributes (pa.Type, false);
1734                         if (cls_attr.Length == 0) {
1735                                 if (a == null)
1736                                         return false;
1737
1738                                 return GetClsCompliantAttributeValue (a, null);
1739                         }
1740
1741                         return ((CLSCompliantAttribute)cls_attr [0]).IsCompliant;
1742                 }
1743
1744                 static bool AnalyzeTypeCompliance (Type type)
1745                 {
1746                         type = TypeManager.DropGenericTypeArguments (type);
1747                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1748                         if (ds != null) {
1749                                 return ds.IsClsComplianceRequired ();
1750                         }
1751
1752                         if (TypeManager.IsGenericParameter (type))
1753                                 return true;
1754
1755                         return GetClsCompliantAttributeValue (type, type.Assembly);
1756                 }
1757
1758                 /// <summary>
1759                 /// Returns instance of ObsoleteAttribute when type is obsolete
1760                 /// </summary>
1761                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1762                 {
1763                         object type_obsolete = analyzed_types_obsolete [type];
1764                         if (type_obsolete == FALSE)
1765                                 return null;
1766
1767                         if (type_obsolete != null)
1768                                 return (ObsoleteAttribute)type_obsolete;
1769
1770                         ObsoleteAttribute result = null;
1771                         if (TypeManager.HasElementType (type)) {
1772                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1773                         } else if (TypeManager.IsGenericParameter (type))
1774                                 result = null;  // TODO: throw new NotSupportedException ()
1775                         else if (TypeManager.IsGenericType (type) && !TypeManager.IsGenericTypeDefinition (type)) {
1776                                 return GetObsoleteAttribute (TypeManager.DropGenericTypeArguments (type));
1777                         } else {
1778                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1779
1780                                 // Type is external, we can get attribute directly
1781                                 if (type_ds == null) {
1782                                         PredefinedAttribute pa = PredefinedAttributes.Get.Obsolete;
1783                                         if (pa.IsDefined) {
1784                                                 object[] attribute = type.GetCustomAttributes (pa.Type, false);
1785                                                 if (attribute.Length == 1)
1786                                                         result = (ObsoleteAttribute) attribute[0];
1787                                         }
1788                                 } else {
1789                                         result = type_ds.GetObsoleteAttribute ();
1790                                 }
1791                         }
1792
1793                         // Cannot use .Add because of corlib bootstrap
1794                         analyzed_types_obsolete [type] = result == null ? FALSE : result;
1795                         return result;
1796                 }
1797
1798                 /// <summary>
1799                 /// Returns instance of ObsoleteAttribute when method is obsolete
1800                 /// </summary>
1801                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1802                 {
1803                         IMethodData mc = TypeManager.GetMethod (mb);
1804                         if (mc != null)
1805                                 return mc.GetObsoleteAttribute ();
1806
1807                         // compiler generated methods are not registered by AddMethod
1808                         if (mb.DeclaringType is TypeBuilder)
1809                                 return null;
1810
1811                         MemberInfo mi = TypeManager.GetPropertyFromAccessor (mb);
1812                         if (mi != null)
1813                                 return GetMemberObsoleteAttribute (mi);
1814
1815                         mi = TypeManager.GetEventFromAccessor (mb);
1816                         if (mi != null)
1817                                 return GetMemberObsoleteAttribute (mi);
1818
1819                         return GetMemberObsoleteAttribute (mb);
1820                 }
1821
1822                 /// <summary>
1823                 /// Returns instance of ObsoleteAttribute when member is obsolete
1824                 /// </summary>
1825                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1826                 {
1827                         object type_obsolete = analyzed_member_obsolete [mi];
1828                         if (type_obsolete == FALSE)
1829                                 return null;
1830
1831                         if (type_obsolete != null)
1832                                 return (ObsoleteAttribute)type_obsolete;
1833
1834                         if ((mi.DeclaringType is TypeBuilder) || TypeManager.IsGenericType (mi.DeclaringType))
1835                                 return null;
1836
1837                         PredefinedAttribute pa = PredefinedAttributes.Get.Obsolete;
1838                         if (!pa.IsDefined)
1839                                 return null;
1840
1841                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, pa.Type, false)
1842                                 as ObsoleteAttribute;
1843                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1844                         return oa;
1845                 }
1846
1847                 /// <summary>
1848                 /// Common method for Obsolete error/warning reporting.
1849                 /// </summary>
1850                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1851                 {
1852                         if (oa.IsError) {
1853                                 Report.Error (619, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1854                                 return;
1855                         }
1856
1857                         if (oa.Message == null || oa.Message.Length == 0) {
1858                                 Report.Warning (612, 1, loc, "`{0}' is obsolete", member);
1859                                 return;
1860                         }
1861                         Report.Warning (618, 2, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1862                 }
1863
1864                 public static bool IsConditionalMethodExcluded (MethodBase mb, Location loc)
1865                 {
1866                         object excluded = analyzed_method_excluded [mb];
1867                         if (excluded != null)
1868                                 return excluded == TRUE ? true : false;
1869
1870                         PredefinedAttribute pa = PredefinedAttributes.Get.Conditional;
1871                         if (!pa.IsDefined)
1872                                 return false;
1873
1874                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (pa.Type, true)
1875                                 as ConditionalAttribute[];
1876                         if (attrs.Length == 0) {
1877                                 analyzed_method_excluded.Add (mb, FALSE);
1878                                 return false;
1879                         }
1880
1881                         foreach (ConditionalAttribute a in attrs) {
1882                                 if (loc.CompilationUnit.IsConditionalDefined (a.ConditionString)) {
1883                                         analyzed_method_excluded.Add (mb, FALSE);
1884                                         return false;
1885                                 }
1886                         }
1887
1888                         analyzed_method_excluded.Add (mb, TRUE);
1889                         return true;
1890                 }
1891
1892                 /// <summary>
1893                 /// Analyzes class whether it has attribute which has ConditionalAttribute
1894                 /// and its condition is not defined.
1895                 /// </summary>
1896                 public static bool IsAttributeExcluded (Type type, Location loc)
1897                 {
1898                         if (!type.IsClass)
1899                                 return false;
1900
1901                         Class class_decl = TypeManager.LookupDeclSpace (type) as Class;
1902
1903                         // TODO: add caching
1904                         // TODO: merge all Type bases attribute caching to one cache to save memory
1905                         PredefinedAttribute pa = PredefinedAttributes.Get.Conditional;
1906                         if (class_decl == null && pa.IsDefined) {
1907                                 object[] attributes = type.GetCustomAttributes (pa.Type, false);
1908                                 foreach (ConditionalAttribute ca in attributes) {
1909                                         if (loc.CompilationUnit.IsConditionalDefined (ca.ConditionString))
1910                                                 return false;
1911                                 }
1912                                 return attributes.Length > 0;
1913                         }
1914
1915                         return class_decl.IsExcluded ();
1916                 }
1917
1918                 public static Type GetCoClassAttribute (Type type)
1919                 {
1920                         TypeContainer tc = TypeManager.LookupInterface (type);
1921                         PredefinedAttribute pa = PredefinedAttributes.Get.CoClass;
1922                         if (tc == null) {
1923                                 if (!pa.IsDefined)
1924                                         return null;
1925
1926                                 object[] o = type.GetCustomAttributes (pa.Type, false);
1927                                 if (o.Length < 1)
1928                                         return null;
1929                                 return ((System.Runtime.InteropServices.CoClassAttribute)o[0]).CoClass;
1930                         }
1931
1932                         if (tc.OptAttributes == null)
1933                                 return null;
1934
1935                         Attribute a = tc.OptAttributes.Search (pa);
1936                         if (a == null)
1937                                 return null;
1938
1939                         return a.GetCoClassAttributeValue ();
1940                 }
1941         }
1942
1943         public class PredefinedAttributes
1944         {
1945                 // Core types
1946                 public readonly PredefinedAttribute ParamArray;
1947                 public readonly PredefinedAttribute Out;
1948
1949                 // Optional types
1950                 public readonly PredefinedAttribute Obsolete;
1951                 public readonly PredefinedAttribute DllImport;
1952                 public readonly PredefinedAttribute MethodImpl;
1953                 public readonly PredefinedAttribute MarshalAs;
1954                 public readonly PredefinedAttribute In;
1955                 public readonly PredefinedAttribute IndexerName;
1956                 public readonly PredefinedAttribute Conditional;
1957                 public readonly PredefinedAttribute CLSCompliant;
1958                 public readonly PredefinedAttribute Security;
1959                 public readonly PredefinedAttribute Required;
1960                 public readonly PredefinedAttribute Guid;
1961                 public readonly PredefinedAttribute AssemblyCulture;
1962                 public readonly PredefinedAttribute AssemblyVersion;
1963                 public readonly PredefinedAttribute ComImport;
1964                 public readonly PredefinedAttribute CoClass;
1965                 public readonly PredefinedAttribute AttributeUsage;
1966                 public readonly PredefinedAttribute DefaultParameterValue;
1967
1968                 // New in .NET 2.0
1969                 public readonly PredefinedAttribute DefaultCharset;
1970                 public readonly PredefinedAttribute TypeForwarder;
1971                 public readonly PredefinedAttribute FixedBuffer;
1972                 public readonly PredefinedAttribute CompilerGenerated;
1973                 public readonly PredefinedAttribute InternalsVisibleTo;
1974                 public readonly PredefinedAttribute RuntimeCompatibility;
1975                 public readonly PredefinedAttribute DebuggerHidden;
1976                 public readonly PredefinedAttribute UnsafeValueType;
1977
1978                 // New in .NET 3.5
1979                 public readonly PredefinedAttribute Extension;
1980
1981                 //
1982                 // Optional types which are used as types and for member lookup
1983                 //
1984                 public readonly PredefinedAttribute DefaultMember;
1985                 public readonly PredefinedAttribute DecimalConstant;
1986                 public readonly PredefinedAttribute StructLayout;
1987                 public readonly PredefinedAttribute FieldOffset;
1988
1989                 public static PredefinedAttributes Get = new PredefinedAttributes ();
1990
1991                 private PredefinedAttributes ()
1992                 {
1993                         ParamArray = new PredefinedAttribute ("System", "ParamArrayAttribute");
1994                         Out = new PredefinedAttribute ("System.Runtime.InteropServices", "OutAttribute");
1995
1996                         Obsolete = new PredefinedAttribute ("System", "ObsoleteAttribute");
1997                         DllImport = new PredefinedAttribute ("System.Runtime.InteropServices", "DllImportAttribute");
1998                         MethodImpl = new PredefinedAttribute ("System.Runtime.CompilerServices", "MethodImplAttribute");
1999                         MarshalAs = new PredefinedAttribute ("System.Runtime.InteropServices", "MarshalAsAttribute");
2000                         In = new PredefinedAttribute ("System.Runtime.InteropServices", "InAttribute");
2001                         IndexerName = new PredefinedAttribute ("System.Runtime.CompilerServices", "IndexerNameAttribute");
2002                         Conditional = new PredefinedAttribute ("System.Diagnostics", "ConditionalAttribute");
2003                         CLSCompliant = new PredefinedAttribute ("System", "CLSCompliantAttribute");
2004                         Security = new PredefinedAttribute ("System.Security.Permissions", "SecurityAttribute");
2005                         Required = new PredefinedAttribute ("System.Runtime.CompilerServices", "RequiredAttributeAttribute");
2006                         Guid = new PredefinedAttribute ("System.Runtime.InteropServices", "GuidAttribute");
2007                         AssemblyCulture = new PredefinedAttribute ("System.Reflection", "AssemblyCultureAttribute");
2008                         AssemblyVersion = new PredefinedAttribute ("System.Reflection", "AssemblyVersionAttribute");
2009                         ComImport = new PredefinedAttribute ("System.Runtime.InteropServices", "ComImportAttribute");
2010                         CoClass = new PredefinedAttribute ("System.Runtime.InteropServices", "CoClassAttribute");
2011                         AttributeUsage = new PredefinedAttribute ("System", "AttributeUsageAttribute");
2012                         DefaultParameterValue = new PredefinedAttribute ("System.Runtime.InteropServices", "DefaultParameterValueAttribute");
2013
2014                         DefaultCharset = new PredefinedAttribute ("System.Runtime.InteropServices", "DefaultCharSetAttribute");
2015                         TypeForwarder = new PredefinedAttribute ("System.Runtime.CompilerServices", "TypeForwardedToAttribute");
2016                         FixedBuffer = new PredefinedAttribute ("System.Runtime.CompilerServices", "FixedBufferAttribute");
2017                         CompilerGenerated = new PredefinedAttribute ("System.Runtime.CompilerServices", "CompilerGeneratedAttribute");
2018                         InternalsVisibleTo = new PredefinedAttribute ("System.Runtime.CompilerServices", "InternalsVisibleToAttribute");
2019                         RuntimeCompatibility = new PredefinedAttribute ("System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
2020                         DebuggerHidden = new PredefinedAttribute ("System.Diagnostics", "DebuggerHiddenAttribute");
2021                         UnsafeValueType = new PredefinedAttribute ("System.Runtime.CompilerServices", "UnsafeValueTypeAttribute");
2022
2023                         Extension = new PredefinedAttribute ("System.Runtime.CompilerServices", "ExtensionAttribute");
2024
2025                         DefaultMember = new PredefinedAttribute ("System.Reflection", "DefaultMemberAttribute");
2026                         DecimalConstant = new PredefinedAttribute ("System.Runtime.CompilerServices", "DecimalConstantAttribute");
2027                         StructLayout = new PredefinedAttribute ("System.Runtime.InteropServices", "StructLayoutAttribute");
2028                         FieldOffset = new PredefinedAttribute ("System.Runtime.InteropServices", "FieldOffsetAttribute");
2029                 }
2030
2031                 public void Initialize ()
2032                 {
2033                         foreach (FieldInfo fi in GetType ().GetFields (BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly)) {
2034                                 ((PredefinedAttribute) fi.GetValue (this)).Resolve (true);
2035                         }
2036                 }
2037
2038                 public static void Reset ()
2039                 {
2040                         Get = new PredefinedAttributes ();
2041                 }
2042         }
2043
2044         public class PredefinedAttribute
2045         {
2046                 Type type;
2047                 CustomAttributeBuilder cab;
2048                 ConstructorInfo ctor;
2049                 readonly string ns, name;
2050
2051                 public PredefinedAttribute (string ns, string name)
2052                 {
2053                         this.ns = ns;
2054                         this.name = name;
2055                 }
2056
2057                 public static bool operator == (Type type, PredefinedAttribute pa)
2058                 {
2059                         return type == pa.type;
2060                 }
2061
2062                 public static bool operator != (Type type, PredefinedAttribute pa)
2063                 {
2064                         return type != pa.type;
2065                 }
2066
2067                 public ConstructorInfo Constructor {
2068                         get { return ctor; }
2069                 }
2070
2071                 public override int GetHashCode ()
2072                 {
2073                         return base.GetHashCode ();
2074                 }
2075
2076                 public override bool Equals (object obj)
2077                 {
2078                         throw new NotSupportedException ();
2079                 }
2080
2081                 public void EmitAttribute (ConstructorBuilder builder)
2082                 {
2083                         if (ResolveBuilder ())
2084                                 builder.SetCustomAttribute (cab);
2085                 }
2086
2087                 public void EmitAttribute (MethodBuilder builder)
2088                 {
2089                         if (ResolveBuilder ())
2090                                 builder.SetCustomAttribute (cab);
2091                 }
2092
2093                 public void EmitAttribute (FieldBuilder builder)
2094                 {
2095                         if (ResolveBuilder ())
2096                                 builder.SetCustomAttribute (cab);
2097                 }
2098
2099                 public void EmitAttribute (TypeBuilder builder)
2100                 {
2101                         if (ResolveBuilder ())
2102                                 builder.SetCustomAttribute (cab);
2103                 }
2104
2105                 public void EmitAttribute (AssemblyBuilder builder)
2106                 {
2107                         if (ResolveBuilder ())
2108                                 builder.SetCustomAttribute (cab);
2109                 }
2110
2111                 public void EmitAttribute (ParameterBuilder builder, Location loc)
2112                 {
2113                         if (ResolveBuilder ())
2114                                 builder.SetCustomAttribute (cab);
2115                 }
2116
2117                 public bool IsDefined {
2118                         get { return type != null && type != typeof (PredefinedAttribute); }
2119                 }
2120
2121                 public bool Resolve (bool canFail)
2122                 {
2123                         if (type != null) {
2124                                 if (IsDefined)
2125                                         return true;
2126                                 if (canFail)
2127                                         return false;
2128                         }
2129
2130                         type = TypeManager.CoreLookupType (ns, name, Kind.Class, !canFail);
2131                         if (type == null) {
2132                                 type = typeof (PredefinedAttribute);
2133                                 return false;
2134                         }
2135
2136                         return true;
2137                 }
2138
2139                 bool ResolveBuilder ()
2140                 {
2141                         if (cab != null)
2142                                 return true;
2143
2144                         //
2145                         // Handle all parameter-less attributes as optional
2146                         //
2147                         if (!Resolve (true))
2148                                 return false;
2149
2150                         ConstructorInfo ci = TypeManager.GetPredefinedConstructor (type, Location.Null, Type.EmptyTypes);
2151                         if (ci == null)
2152                                 return false;
2153
2154                         cab = new CustomAttributeBuilder (ci, new object[0]);
2155                         return true;
2156                 }
2157
2158                 public bool ResolveConstructor (Location loc, params Type[] argType)
2159                 {
2160                         if (ctor != null)
2161                                 throw new InternalErrorException ("Predefined ctor redefined");
2162
2163                         if (!Resolve (false))
2164                                 return false;
2165
2166                         ctor = TypeManager.GetPredefinedConstructor (type, loc, argType);
2167                         return ctor != null;
2168                 }
2169
2170                 public Type Type {
2171                         get { return type; }
2172                 }
2173         }
2174 }