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                 Arguments PosArguments;
 129                 Arguments 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, Arguments[] 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 = args [0];
 159                                 NamedArguments = 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 (NamedArgument name)
 204                 {
 205                         Report.Error (617, name.Name.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.Name.Value);
 209                 }
 210
 211                 void Error_InvalidNamedArgumentType (NamedArgument name)
 212                 {
 213                         Report.Error (655, name.Name.Location,
 214                                 "`{0}' is not a valid named attribute argument because it is not a valid attribute parameter type",
 215                                 name.Name.Value);
 216                 }
 217
 218                 public static void Error_AttributeArgumentNotValid (Location loc)
 219                 {
 220                         Report.Error (182, loc,
 221                                       "An attribute argument must be a constant expression, typeof " +
 222                                       "expression or array creation expression");
 223                 }
 224
 225                 static void Error_TypeParameterInAttribute (Location loc)
 226                 {
 227                         Report.Error (
 228                                 -202, loc, "Can not use a type parameter in an attribute");
 229                 }
 230
 231                 public void Error_MissingGuidAttribute ()
 232                 {
 233                         Report.Error (596, Location, "The Guid attribute must be specified with the ComImport attribute");
 234                 }
 235
 236                 public void Error_MisusedExtensionAttribute ()
 237                 {
 238                         Report.Error (1112, Location, "Do not use `{0}' directly. Use parameter modifier `this' instead", GetSignatureForError ());
 239                 }
 240
 241                 /// <summary>
 242                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 243                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 244                 /// </summary>
 245                 public void Error_AttributeEmitError (string inner)
 246                 {
 247                         Report.Error (647, Location, "Error during emitting `{0}' attribute. The reason is `{1}'",
 248                                       TypeManager.CSharpName (Type), inner);
 249                 }
 250
 251                 public void Error_InvalidSecurityParent ()
 252                 {
 253                         Error_AttributeEmitError ("it is attached to invalid parent");
 254                 }
 255
 256                 Attributable Owner {
 257                         get {
 258                                 return owners [0];
 259                         }
 260                 }
 261
 262                 protected virtual TypeExpr ResolveAsTypeTerminal (Expression expr, IResolveContext ec, bool silent)
 263                 {
 264                         return expr.ResolveAsTypeTerminal (ec, silent);
 265                 }
 266
 267                 Type ResolvePossibleAttributeType (string name, bool silent, ref bool is_attr)
 268                 {
 269                         IResolveContext rc = new AttributeResolveContext (Owner.ResolveContext);
 270
 271                         TypeExpr te;
 272                         if (LeftExpr == null) {
 273                                 te = ResolveAsTypeTerminal (new SimpleName (name, Location), rc, silent);
 274                         } else {
 275                                 te = ResolveAsTypeTerminal (new MemberAccess (LeftExpr, name), rc, silent);
 276                         }
 277
 278                         if (te == null)
 279                                 return null;
 280
 281                         Type t = te.Type;
 282                         if (TypeManager.IsSubclassOf (t, TypeManager.attribute_type)) {
 283                                 is_attr = true;
 284                         } else if (!silent) {
 285                                 Report.SymbolRelatedToPreviousError (t);
 286                                 Report.Error (616, Location, "`{0}': is not an attribute class", TypeManager.CSharpName (t));
 287                         }
 288                         return t;
 289                 }
 290
 291                 /// <summary>
 292                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 293                 /// </summary>
 294                 void ResolveAttributeType ()
 295                 {
 296                         bool t1_is_attr = false;
 297                         Type t1 = ResolvePossibleAttributeType (Identifier, true, ref t1_is_attr);
 298
 299                         bool t2_is_attr = false;
 300                         Type t2 = nameEscaped ? null :
 301                                 ResolvePossibleAttributeType (Identifier + "Attribute", true, ref t2_is_attr);
 302
 303                         if (t1_is_attr && t2_is_attr) {
 304                                 Report.Error (1614, Location, "`{0}' is ambiguous between `{0}' and `{0}Attribute'. " +
 305                                               "Use either `@{0}' or `{0}Attribute'", GetSignatureForError ());
 306                                 resolve_error = true;
 307                                 return;
 308                         }
 309
 310                         if (t1_is_attr) {
 311                                 Type = t1;
 312                                 return;
 313                         }
 314
 315                         if (t2_is_attr) {
 316                                 Type = t2;
 317                                 return;
 318                         }
 319
 320                         if (t1 == null && t2 == null)
 321                                 ResolvePossibleAttributeType (Identifier, false, ref t1_is_attr);
 322                         if (t1 != null)
 323                                 ResolvePossibleAttributeType (Identifier, false, ref t1_is_attr);
 324                         if (t2 != null)
 325                                 ResolvePossibleAttributeType (Identifier + "Attribute", false, ref t2_is_attr);
 326
 327                         resolve_error = true;
 328                 }
 329
 330                 public virtual Type ResolveType ()
 331                 {
 332                         if (Type == null && !resolve_error)
 333                                 ResolveAttributeType ();
 334                         return Type;
 335                 }
 336
 337                 public override string GetSignatureForError ()
 338                 {
 339                         if (Type != null)
 340                                 return TypeManager.CSharpName (Type);
 341
 342                         return LeftExpr == null ? Identifier : LeftExpr.GetSignatureForError () + "." + Identifier;
 343                 }
 344
 345                 public bool HasSecurityAttribute {
 346                         get {
 347                                 PredefinedAttribute pa = PredefinedAttributes.Get.Security;
 348                                 return pa.IsDefined && TypeManager.IsSubclassOf (type, pa.Type);
 349                         }
 350                 }
 351
 352                 public bool IsValidSecurityAttribute ()
 353                 {
 354                         return HasSecurityAttribute && IsSecurityActionValid (false);
 355                 }
 356
 357                 static bool IsValidArgumentType (Type t)
 358                 {
 359                         if (t.IsArray)
 360                                 t = TypeManager.GetElementType (t);
 361
 362                         return t == TypeManager.string_type ||
 363                                 TypeManager.IsPrimitiveType (t) ||
 364                                 TypeManager.IsEnumType (t) ||
 365                                 t == TypeManager.object_type ||
 366                                 t == TypeManager.type_type;
 367                 }
 368
 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 Arguments (1);
 380                         } else {
 381                                 foreach (NamedArgument a in NamedArguments) {
 382                                         if (a.Name.Value == CharSetEnumMember)
 383                                                 return;
 384                                 }
 385                         }
 386
 387                         NamedArguments.Add (new NamedArgument (new LocatedToken (loc, CharSetEnumMember),
 388                                 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                                 bool dynamic;
 480                                 PosArguments.Resolve (ec, out dynamic);
 481                                 if (dynamic)
 482                                         throw new NotImplementedException ("dynamic");
 483                         }
 484
 485                         MethodGroupExpr mg = MemberLookupFinal (ec, ec.ContainerType,
 486                                 Type, ConstructorInfo.ConstructorName, MemberTypes.Constructor,
 487                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 488                                 Location) as MethodGroupExpr;
 489
 490                         if (mg == null)
 491                                 throw new NotImplementedException ();
 492
 493                         mg = mg.OverloadResolve (ec, ref PosArguments, false, Location);
 494                         if (mg == null)
 495                                 return null;
 496
 497                         ConstructorInfo constructor = (ConstructorInfo)mg;
 498                         if (PosArguments == null) {
 499                                 pos_values = EmptyObject;
 500                                 return constructor;
 501                         }
 502
 503                         AParametersCollection pd = TypeManager.GetParameterData (constructor);
 504
 505                         if (!PosArguments.GetAttributableValue (ec, out pos_values))
 506                                 return null;
 507
 508                         // Here we do the checks which should be done by corlib or by runtime.
 509                         // However Zoltan doesn't like it and every Mono compiler has to do it again.
 510                         PredefinedAttributes pa = PredefinedAttributes.Get;
 511                         if (Type == pa.Guid) {
 512                                 try {
 513                                         new Guid ((string)pos_values [0]);
 514                                 }
 515                                 catch (Exception e) {
 516                                         Error_AttributeEmitError (e.Message);
 517                                         return null;
 518                                 }
 519                         }
 520
 521                         if (Type == pa.AttributeUsage && (int)pos_values [0] == 0) {
 522                                 Report.Error (591, Location, "Invalid value for argument to `System.AttributeUsage' attribute");
 523                                 return null;
 524                         }
 525
 526                         if (Type == pa.IndexerName || Type == pa.Conditional) {
 527                                 string v = pos_values [0] as string;
 528                                 if (!Tokenizer.IsValidIdentifier (v) || Tokenizer.IsKeyword (v)) {
 529                                         Report.Error (633, PosArguments [0].Expr.Location,
 530                                                 "The argument to the `{0}' attribute must be a valid identifier", GetSignatureForError ());
 531                                         return null;
 532                                 }
 533                         }
 534
 535                         if (Type == pa.MethodImpl && pos_values.Length == 1 &&
 536                                 pd.Types [0] == TypeManager.short_type &&
 537                                 !System.Enum.IsDefined (typeof (MethodImplOptions), pos_values [0].ToString ())) {
 538                                 Error_AttributeEmitError ("Incorrect argument value.");
 539                                 return null;
 540                         }
 541
 542                         return constructor;
 543                 }
 544
 545                 protected virtual bool ResolveNamedArguments (EmitContext ec)
 546                 {
 547                         int named_arg_count = NamedArguments.Count;
 548
 549                         ArrayList field_infos = new ArrayList (named_arg_count);
 550                         ArrayList prop_infos  = new ArrayList (named_arg_count);
 551                         ArrayList field_values = new ArrayList (named_arg_count);
 552                         ArrayList prop_values = new ArrayList (named_arg_count);
 553
 554                         ArrayList seen_names = new ArrayList (named_arg_count);
 555
 556                         foreach (NamedArgument a in NamedArguments) {
 557                                 string name = a.Name.Value;
 558                                 if (seen_names.Contains (name)) {
 559                                         Report.Error (643, a.Name.Location, "Duplicate named attribute `{0}' argument", name);
 560                                         continue;
 561                                 }
 562
 563                                 seen_names.Add (name);
 564
 565                                 a.Resolve (ec);
 566
 567                                 Expression member = Expression.MemberLookup (
 568                                         ec.ContainerType, Type, name,
 569                                         MemberTypes.All,
 570                                         BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static,
 571                                         Location);
 572
 573                                 if (member == null) {
 574                                         member = Expression.MemberLookup (ec.ContainerType, Type, name,
 575                                                 MemberTypes.All, BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static,
 576                                                 Location);
 577
 578                                         if (member != null) {
 579                                                 Report.SymbolRelatedToPreviousError (member.Type);
 580                                                 Expression.ErrorIsInaccesible (Location, member.GetSignatureForError ());
 581                                                 return false;
 582                                         }
 583                                 }
 584
 585                                 if (member == null){
 586                                         Expression.Error_TypeDoesNotContainDefinition (Location, Type, name);
 587                                         return false;
 588                                 }
 589
 590                                 if (!(member is PropertyExpr || member is FieldExpr)) {
 591                                         Error_InvalidNamedArgument (a);
 592                                         return false;
 593                                 }
 594
 595                                 if (a.Expr is TypeParameterExpr){
 596                                         Error_TypeParameterInAttribute (Location);
 597                                         return false;
 598                                 }
 599
 600                                 ObsoleteAttribute obsolete_attr;
 601
 602                                 if (member is PropertyExpr) {
 603                                         PropertyInfo pi = ((PropertyExpr) member).PropertyInfo;
 604
 605                                         if (!pi.CanWrite || !pi.CanRead || pi.GetGetMethod ().IsStatic) {
 606                                                 Report.SymbolRelatedToPreviousError (pi);
 607                                                 Error_InvalidNamedArgument (a);
 608                                                 return false;
 609                                         }
 610
 611                                         if (!IsValidArgumentType (member.Type)) {
 612                                                 Report.SymbolRelatedToPreviousError (pi);
 613                                                 Error_InvalidNamedArgumentType (a);
 614                                                 return false;
 615                                         }
 616
 617                                         object value;
 618                                         if (!a.Expr.GetAttributableValue (ec, member.Type, out value))
 619                                                 return false;
 620
 621                                         PropertyBase pb = TypeManager.GetProperty (pi);
 622                                         if (pb != null)
 623                                                 obsolete_attr = pb.GetObsoleteAttribute ();
 624                                         else
 625                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (pi);
 626
 627                                         prop_values.Add (value);
 628                                         prop_infos.Add (pi);
 629
 630                                 } else {
 631                                         FieldInfo fi = ((FieldExpr) member).FieldInfo;
 632
 633                                         if (fi.IsInitOnly || fi.IsStatic) {
 634                                                 Error_InvalidNamedArgument (a);
 635                                                 return false;
 636                                         }
 637
 638                                         if (!IsValidArgumentType (member.Type)) {
 639                                                 Report.SymbolRelatedToPreviousError (fi);
 640                                                 Error_InvalidNamedArgumentType (a);
 641                                                 return false;
 642                                         }
 643
 644                                         object value;
 645                                         if (!a.Expr.GetAttributableValue (ec, member.Type, out value))
 646                                                 return false;
 647
 648                                         FieldBase fb = TypeManager.GetField (fi);
 649                                         if (fb != null)
 650                                                 obsolete_attr = fb.GetObsoleteAttribute ();
 651                                         else
 652                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (fi);
 653
 654                                         field_values.Add (value);
 655                                         field_infos.Add (fi);
 656                                 }
 657
 658                                 if (obsolete_attr != null && !Owner.ResolveContext.IsInObsoleteScope)
 659                                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, member.GetSignatureForError (), member.Location);
 660                         }
 661
 662                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 663                         field_info_arr = new FieldInfo [field_infos.Count];
 664                         field_values_arr = new object [field_values.Count];
 665                         prop_values_arr = new object [prop_values.Count];
 666
 667                         field_infos.CopyTo  (field_info_arr, 0);
 668                         field_values.CopyTo (field_values_arr, 0);
 669
 670                         prop_values.CopyTo  (prop_values_arr, 0);
 671                         prop_infos.CopyTo   (prop_info_arr, 0);
 672
 673                         return true;
 674                 }
 675
 676                 /// <summary>
 677                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 678                 /// </summary>
 679                 public string GetValidTargets ()
 680                 {
 681                         StringBuilder sb = new StringBuilder ();
 682                         AttributeTargets targets = GetAttributeUsage (Type).ValidOn;
 683
 684                         if ((targets & AttributeTargets.Assembly) != 0)
 685                                 sb.Append ("assembly, ");
 686
 687                         if ((targets & AttributeTargets.Module) != 0)
 688                                 sb.Append ("module, ");
 689
 690                         if ((targets & AttributeTargets.Class) != 0)
 691                                 sb.Append ("class, ");
 692
 693                         if ((targets & AttributeTargets.Struct) != 0)
 694                                 sb.Append ("struct, ");
 695
 696                         if ((targets & AttributeTargets.Enum) != 0)
 697                                 sb.Append ("enum, ");
 698
 699                         if ((targets & AttributeTargets.Constructor) != 0)
 700                                 sb.Append ("constructor, ");
 701
 702                         if ((targets & AttributeTargets.Method) != 0)
 703                                 sb.Append ("method, ");
 704
 705                         if ((targets & AttributeTargets.Property) != 0)
 706                                 sb.Append ("property, indexer, ");
 707
 708                         if ((targets & AttributeTargets.Field) != 0)
 709                                 sb.Append ("field, ");
 710
 711                         if ((targets & AttributeTargets.Event) != 0)
 712                                 sb.Append ("event, ");
 713
 714                         if ((targets & AttributeTargets.Interface) != 0)
 715                                 sb.Append ("interface, ");
 716
 717                         if ((targets & AttributeTargets.Parameter) != 0)
 718                                 sb.Append ("parameter, ");
 719
 720                         if ((targets & AttributeTargets.Delegate) != 0)
 721                                 sb.Append ("delegate, ");
 722
 723                         if ((targets & AttributeTargets.ReturnValue) != 0)
 724                                 sb.Append ("return, ");
 725
 726 #if NET_2_0
 727                         if ((targets & AttributeTargets.GenericParameter) != 0)
 728                                 sb.Append ("type parameter, ");
 729 #endif
 730                         return sb.Remove (sb.Length - 2, 2).ToString ();
 731                 }
 732
 733                 /// <summary>
 734                 /// Returns AttributeUsage attribute based on types hierarchy
 735                 /// </summary>
 736                 static AttributeUsageAttribute GetAttributeUsage (Type type)
 737                 {
 738                         AttributeUsageAttribute ua = usage_attr_cache [type] as AttributeUsageAttribute;
 739                         if (ua != null)
 740                                 return ua;
 741
 742                         Class attr_class = TypeManager.LookupClass (type);
 743                         PredefinedAttribute pa = PredefinedAttributes.Get.AttributeUsage;
 744
 745                         if (attr_class == null) {
 746                                 if (!pa.IsDefined)
 747                                         return new AttributeUsageAttribute (0);
 748
 749                                 object[] usage_attr = type.GetCustomAttributes (pa.Type, true);
 750                                 ua = (AttributeUsageAttribute)usage_attr [0];
 751                                 usage_attr_cache.Add (type, ua);
 752                                 return ua;
 753                         }
 754
 755                         Attribute a = null;
 756                         if (attr_class.OptAttributes != null)
 757                                 a = attr_class.OptAttributes.Search (pa);
 758
 759                         if (a == null) {
 760                                 if (attr_class.TypeBuilder.BaseType != TypeManager.attribute_type)
 761                                         ua = GetAttributeUsage (attr_class.TypeBuilder.BaseType);
 762                                 else
 763                                         ua = DefaultUsageAttribute;
 764                         } else {
 765                                 ua = a.GetAttributeUsageAttribute ();
 766                         }
 767
 768                         usage_attr_cache.Add (type, ua);
 769                         return ua;
 770                 }
 771
 772                 AttributeUsageAttribute GetAttributeUsageAttribute ()
 773                 {
 774                         if (pos_values == null)
 775                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 776                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 777                                 Resolve ();
 778
 779                         if (resolve_error)
 780                                 return DefaultUsageAttribute;
 781
 782                         AttributeUsageAttribute usage_attribute = new AttributeUsageAttribute ((AttributeTargets)pos_values [0]);
 783
 784                         object field = GetPropertyValue ("AllowMultiple");
 785                         if (field != null)
 786                                 usage_attribute.AllowMultiple = (bool)field;
 787
 788                         field = GetPropertyValue ("Inherited");
 789                         if (field != null)
 790                                 usage_attribute.Inherited = (bool)field;
 791
 792                         return usage_attribute;
 793                 }
 794
 795                 /// <summary>
 796                 /// Returns custom name of indexer
 797                 /// </summary>
 798                 public string GetIndexerAttributeValue ()
 799                 {
 800                         if (pos_values == null)
 801                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 802                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 803                                 Resolve ();
 804
 805                         if (resolve_error)
 806                                 return null;
 807
 808                         return pos_values [0] as string;
 809                 }
 810
 811                 /// <summary>
 812                 /// Returns condition of ConditionalAttribute
 813                 /// </summary>
 814                 public string GetConditionalAttributeValue ()
 815                 {
 816                         if (pos_values == null)
 817                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 818                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 819                                 Resolve ();
 820
 821                         if (resolve_error)
 822                                 return null;
 823
 824                         return (string)pos_values [0];
 825                 }
 826
 827                 /// <summary>
 828                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 829                 /// </summary>
 830                 public ObsoleteAttribute GetObsoleteAttribute ()
 831                 {
 832                         if (pos_values == null)
 833                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 834                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 835                                 Resolve ();
 836
 837                         if (resolve_error)
 838                                 return null;
 839
 840                         if (pos_values == null || pos_values.Length == 0)
 841                                 return new ObsoleteAttribute ();
 842
 843                         if (pos_values.Length == 1)
 844                                 return new ObsoleteAttribute ((string)pos_values [0]);
 845
 846                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 847                 }
 848
 849                 /// <summary>
 850                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 851                 /// before ApplyAttribute. We need to resolve the arguments.
 852                 /// This situation occurs when class deps is differs from Emit order.
 853                 /// </summary>
 854                 public bool GetClsCompliantAttributeValue ()
 855                 {
 856                         if (pos_values == null)
 857                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 858                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 859                                 Resolve ();
 860
 861                         if (resolve_error)
 862                                 return false;
 863
 864                         return (bool)pos_values [0];
 865                 }
 866
 867                 public Type GetCoClassAttributeValue ()
 868                 {
 869                         if (pos_values == null)
 870                                 Resolve ();
 871
 872                         if (resolve_error)
 873                                 return null;
 874
 875                         return (Type)pos_values [0];
 876                 }
 877
 878                 public bool CheckTarget ()
 879                 {
 880                         string[] valid_targets = Owner.ValidAttributeTargets;
 881                         if (ExplicitTarget == null || ExplicitTarget == valid_targets [0]) {
 882                                 Target = Owner.AttributeTargets;
 883                                 return true;
 884                         }
 885
 886                         // TODO: we can skip the first item
 887                         if (((IList) valid_targets).Contains (ExplicitTarget)) {
 888                                 switch (ExplicitTarget) {
 889                                 case "return": Target = AttributeTargets.ReturnValue; return true;
 890                                 case "param": Target = AttributeTargets.Parameter; return true;
 891                                 case "field": Target = AttributeTargets.Field; return true;
 892                                 case "method": Target = AttributeTargets.Method; return true;
 893                                 case "property": Target = AttributeTargets.Property; return true;
 894                                 }
 895                                 throw new InternalErrorException ("Unknown explicit target: " + ExplicitTarget);
 896                         }
 897
 898                         StringBuilder sb = new StringBuilder ();
 899                         foreach (string s in valid_targets) {
 900                                 sb.Append (s);
 901                                 sb.Append (", ");
 902                         }
 903                         sb.Remove (sb.Length - 2, 2);
 904                         Report.Error (657, Location, "`{0}' is not a valid attribute location for this declaration. " +
 905                                 "Valid attribute locations for this declaration are `{1}'", ExplicitTarget, sb.ToString ());
 906                         return false;
 907                 }
 908
 909                 /// <summary>
 910                 /// Tests permitted SecurityAction for assembly or other types
 911                 /// </summary>
 912                 protected virtual bool IsSecurityActionValid (bool for_assembly)
 913                 {
 914                         SecurityAction action = GetSecurityActionValue ();
 915
 916                         switch (action) {
 917                         case SecurityAction.Demand:
 918                         case SecurityAction.Assert:
 919                         case SecurityAction.Deny:
 920                         case SecurityAction.PermitOnly:
 921                         case SecurityAction.LinkDemand:
 922                         case SecurityAction.InheritanceDemand:
 923                                 if (!for_assembly)
 924                                         return true;
 925                                 break;
 926
 927                         case SecurityAction.RequestMinimum:
 928                         case SecurityAction.RequestOptional:
 929                         case SecurityAction.RequestRefuse:
 930                                 if (for_assembly)
 931                                         return true;
 932                                 break;
 933
 934                         default:
 935                                 Error_AttributeEmitError ("SecurityAction is out of range");
 936                                 return false;
 937                         }
 938
 939                         Error_AttributeEmitError (String.Concat ("SecurityAction `", action, "' is not valid for this declaration"));
 940                         return false;
 941                 }
 942
 943                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 944                 {
 945                         return (SecurityAction)pos_values [0];
 946                 }
 947
 948                 /// <summary>
 949                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 950                 /// </summary>
 951                 /// <returns></returns>
 952                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 953                 {
 954                         Type orig_assembly_type = null;
 955
 956                         if (TypeManager.LookupDeclSpace (Type) != null) {
 957                                 if (!RootContext.StdLib) {
 958                                         orig_assembly_type = Type.GetType (Type.FullName);
 959                                 } else {
 960                                         string orig_version_path = Environment.GetEnvironmentVariable ("__SECURITY_BOOTSTRAP_DB");
 961                                         if (orig_version_path == null) {
 962                                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 963                                                 return;
 964                                         }
 965
 966                                         if (orig_sec_assembly == null) {
 967                                                 string file = Path.Combine (orig_version_path, Driver.OutputFile);
 968                                                 orig_sec_assembly = Assembly.LoadFile (file);
 969                                         }
 970
 971                                         orig_assembly_type = orig_sec_assembly.GetType (Type.FullName, true);
 972                                         if (orig_assembly_type == null) {
 973                                                 Report.Warning (-112, 1, Location, "Self-referenced security attribute `{0}' " +
 974                                                                 "was not found in previous version of assembly");
 975                                                 return;
 976                                         }
 977                                 }
 978                         }
 979
 980                         SecurityAttribute sa;
 981                         // For all non-selfreferencing security attributes we can avoid all hacks
 982                         if (orig_assembly_type == null) {
 983                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 984
 985                                 if (prop_info_arr != null) {
 986                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 987                                                 PropertyInfo pi = prop_info_arr [i];
 988                                                 pi.SetValue (sa, prop_values_arr [i], null);
 989                                         }
 990                                 }
 991                         } else {
 992                                 // HACK: All security attributes have same ctor syntax
 993                                 sa = (SecurityAttribute) Activator.CreateInstance (orig_assembly_type, new object[] { GetSecurityActionValue () } );
 994
 995                                 // All types are from newly created assembly but for invocation with old one we need to convert them
 996                                 if (prop_info_arr != null) {
 997                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 998                                                 PropertyInfo emited_pi = prop_info_arr [i];
 999                                                 // FIXME: We are missing return type filter
1000                                                 // TODO: pi can be null
1001                                                 PropertyInfo pi = orig_assembly_type.GetProperty (emited_pi.Name);
1002
1003                                                 object old_instance = TypeManager.IsEnumType (pi.PropertyType) ?
1004                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
1005                                                         prop_values_arr [i];
1006
1007                                                 pi.SetValue (sa, old_instance, null);
1008                                         }
1009                                 }
1010                         }
1011
1012                         IPermission perm;
1013                         perm = sa.CreatePermission ();
1014                         SecurityAction action = GetSecurityActionValue ();
1015
1016                         // IS is correct because for corlib we are using an instance from old corlib
1017                         if (!(perm is System.Security.CodeAccessPermission)) {
1018                                 switch (action) {
1019                                 case SecurityAction.Demand:
1020                                         action = (SecurityAction)13;
1021                                         break;
1022                                 case SecurityAction.LinkDemand:
1023                                         action = (SecurityAction)14;
1024                                         break;
1025                                 case SecurityAction.InheritanceDemand:
1026                                         action = (SecurityAction)15;
1027                                         break;
1028                                 }
1029                         }
1030
1031                         PermissionSet ps = (PermissionSet)permissions [action];
1032                         if (ps == null) {
1033                                 if (sa is PermissionSetAttribute)
1034                                         ps = new PermissionSet (sa.Unrestricted ? PermissionState.Unrestricted : PermissionState.None);
1035                                 else
1036                                         ps = new PermissionSet (PermissionState.None);
1037
1038                                 permissions.Add (action, ps);
1039                         } else if (!ps.IsUnrestricted () && (sa is PermissionSetAttribute) && sa.Unrestricted) {
1040                                 ps = ps.Union (new PermissionSet (PermissionState.Unrestricted));
1041                                 permissions [action] = ps;
1042                         }
1043                         ps.AddPermission (perm);
1044                 }
1045
1046                 public object GetPropertyValue (string name)
1047                 {
1048                         if (prop_info_arr == null)
1049                                 return null;
1050
1051                         for (int i = 0; i < prop_info_arr.Length; ++i) {
1052                                 if (prop_info_arr [i].Name == name)
1053                                         return prop_values_arr [i];
1054                         }
1055
1056                         return null;
1057                 }
1058
1059                 //
1060                 // Theoretically, we can get rid of this, since FieldBuilder.SetCustomAttribute()
1061                 // and ParameterBuilder.SetCustomAttribute() are supposed to handle this attribute.
1062                 // However, we can't, since it appears that the .NET 1.1 SRE hangs when given a MarshalAsAttribute.
1063                 //
1064 #if !NET_2_0
1065                 public UnmanagedMarshal GetMarshal (Attributable attr)
1066                 {
1067                         UnmanagedType UnmanagedType;
1068                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (UnmanagedType))
1069                                 UnmanagedType = (UnmanagedType) System.Enum.ToObject (typeof (UnmanagedType), pos_values [0]);
1070                         else
1071                                 UnmanagedType = (UnmanagedType) pos_values [0];
1072
1073                         object value = GetFieldValue ("SizeParamIndex");
1074                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
1075                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
1076                                 return null;
1077                         }
1078
1079                         object o = GetFieldValue ("ArraySubType");
1080                         UnmanagedType array_sub_type = o == null ? (UnmanagedType) 0x50 /* NATIVE_MAX */ : (UnmanagedType) o;
1081
1082                         switch (UnmanagedType) {
1083                         case UnmanagedType.CustomMarshaler: {
1084                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
1085                                         BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1086                                 if (define_custom == null) {
1087                                         Report.RuntimeMissingSupport (Location, "set marshal info");
1088                                         return null;
1089                                 }
1090
1091                                 object [] args = new object [4];
1092                                 args [0] = GetFieldValue ("MarshalTypeRef");
1093                                 args [1] = GetFieldValue ("MarshalCookie");
1094                                 args [2] = GetFieldValue ("MarshalType");
1095                                 args [3] = Guid.Empty;
1096                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
1097                         }
1098                         case UnmanagedType.LPArray: {
1099                                 object size_const = GetFieldValue ("SizeConst");
1100                                 object size_param_index = GetFieldValue ("SizeParamIndex");
1101
1102                                 if ((size_const != null) || (size_param_index != null)) {
1103                                         MethodInfo define_array = typeof (UnmanagedMarshal).GetMethod ("DefineLPArrayInternal",
1104                                                 BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1105                                         if (define_array == null) {
1106                                                 Report.RuntimeMissingSupport (Location, "set marshal info");
1107                                                 return null;
1108                                         }
1109
1110                                         object [] args = new object [3];
1111                                         args [0] = array_sub_type;
1112                                         args [1] = size_const == null ? -1 : size_const;
1113                                         args [2] = size_param_index == null ? -1 : size_param_index;
1114                                         return (UnmanagedMarshal) define_array.Invoke (null, args);
1115                                 }
1116                                 else
1117                                         return UnmanagedMarshal.DefineLPArray (array_sub_type);
1118                         }
1119                         case UnmanagedType.SafeArray:
1120                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
1121
1122                         case UnmanagedType.ByValArray:
1123                                 FieldBase fm = attr as FieldBase;
1124                                 if (fm == null) {
1125                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
1126                                         return null;
1127                                 }
1128                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
1129
1130                         case UnmanagedType.ByValTStr:
1131                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
1132
1133                         default:
1134                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
1135                         }
1136                 }
1137
1138                 object GetFieldValue (string name)
1139                 {
1140                         int i;
1141                         if (field_info_arr == null)
1142                                 return null;
1143                         i = 0;
1144                         foreach (FieldInfo fi in field_info_arr) {
1145                                 if (fi.Name == name)
1146                                         return GetValue (field_values_arr [i]);
1147                                 i++;
1148                         }
1149                         return null;
1150                 }
1151
1152                 static object GetValue (object value)
1153                 {
1154                         if (value is EnumConstant)
1155                                 return ((EnumConstant) value).GetValue ();
1156                         else
1157                                 return value;
1158                 }
1159
1160 #endif
1161
1162                 public CharSet GetCharSetValue ()
1163                 {
1164                         return (CharSet)System.Enum.Parse (typeof (CharSet), pos_values [0].ToString ());
1165                 }
1166
1167                 public bool HasField (string fieldName)
1168                 {
1169                         if (field_info_arr == null)
1170                                 return false;
1171
1172                         foreach (FieldInfo fi in field_info_arr) {
1173                                 if (fi.Name == fieldName)
1174                                         return true;
1175                         }
1176
1177                         return false;
1178                 }
1179
1180                 public bool IsInternalMethodImplAttribute {
1181                         get {
1182                                 if (Type != PredefinedAttributes.Get.MethodImpl)
1183                                         return false;
1184
1185                                 MethodImplOptions options;
1186                                 if (pos_values[0].GetType () != typeof (MethodImplOptions))
1187                                         options = (MethodImplOptions)System.Enum.ToObject (typeof (MethodImplOptions), pos_values[0]);
1188                                 else
1189                                         options = (MethodImplOptions)pos_values[0];
1190
1191                                 return (options & MethodImplOptions.InternalCall) != 0;
1192                         }
1193                 }
1194
1195                 public LayoutKind GetLayoutKindValue ()
1196                 {
1197                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (LayoutKind))
1198                                 return (LayoutKind)System.Enum.ToObject (typeof (LayoutKind), pos_values [0]);
1199
1200                         return (LayoutKind)pos_values [0];
1201                 }
1202
1203                 public object GetParameterDefaultValue ()
1204                 {
1205                         return pos_values [0];
1206                 }
1207
1208                 public override bool Equals (object obj)
1209                 {
1210                         Attribute a = obj as Attribute;
1211                         if (a == null)
1212                                 return false;
1213
1214                         return Type == a.Type && Target == a.Target;
1215                 }
1216
1217                 public override int GetHashCode ()
1218                 {
1219                         return base.GetHashCode ();
1220                 }
1221
1222                 /// <summary>
1223                 /// Emit attribute for Attributable symbol
1224                 /// </summary>
1225                 public void Emit (ListDictionary allEmitted)
1226                 {
1227                         CustomAttributeBuilder cb = Resolve ();
1228                         if (cb == null)
1229                                 return;
1230
1231                         AttributeUsageAttribute usage_attr = GetAttributeUsage (Type);
1232                         if ((usage_attr.ValidOn & Target) == 0) {
1233                                 Report.Error (592, Location, "The attribute `{0}' is not valid on this declaration type. " +
1234                                               "It is valid on `{1}' declarations only",
1235                                         GetSignatureForError (), GetValidTargets ());
1236                                 return;
1237                         }
1238
1239                         try {
1240                                 foreach (Attributable owner in owners)
1241                                         owner.ApplyAttributeBuilder (this, cb, PredefinedAttributes.Get);
1242                         }
1243                         catch (Exception e) {
1244                                 Error_AttributeEmitError (e.Message);
1245                                 return;
1246                         }
1247
1248                         if (!usage_attr.AllowMultiple && allEmitted != null) {
1249                                 if (allEmitted.Contains (this)) {
1250                                         ArrayList a = allEmitted [this] as ArrayList;
1251                                         if (a == null) {
1252                                                 a = new ArrayList (2);
1253                                                 allEmitted [this] = a;
1254                                         }
1255                                         a.Add (this);
1256                                 } else {
1257                                         allEmitted.Add (this, null);
1258                                 }
1259                         }
1260
1261                         if (!RootContext.VerifyClsCompliance)
1262                                 return;
1263
1264                         // Here we are testing attribute arguments for array usage (error 3016)
1265                         if (Owner.IsClsComplianceRequired ()) {
1266                                 if (PosArguments != null)
1267                                         PosArguments.CheckArrayAsAttribute ();
1268
1269                                 if (NamedArguments == null)
1270                                         return;
1271
1272                                 NamedArguments.CheckArrayAsAttribute ();
1273                         }
1274                 }
1275
1276                 private Expression GetValue ()
1277                 {
1278                         if (PosArguments == null || PosArguments.Count < 1)
1279                                 return null;
1280
1281                         return PosArguments [0].Expr;
1282                 }
1283
1284                 public string GetString ()
1285                 {
1286                         Expression e = GetValue ();
1287                         if (e is StringConstant)
1288                                 return ((StringConstant)e).Value;
1289                         return null;
1290                 }
1291
1292                 public bool GetBoolean ()
1293                 {
1294                         Expression e = GetValue ();
1295                         if (e is BoolConstant)
1296                                 return ((BoolConstant)e).Value;
1297                         return false;
1298                 }
1299
1300                 public Type GetArgumentType ()
1301                 {
1302                         TypeOf e = GetValue () as TypeOf;
1303                         if (e == null)
1304                                 return null;
1305                         return e.TypeArgument;
1306                 }
1307
1308                 public override Expression CreateExpressionTree (EmitContext ec)
1309                 {
1310                         throw new NotSupportedException ("ET");
1311                 }
1312
1313                 public override Expression DoResolve (EmitContext ec)
1314                 {
1315                         throw new NotImplementedException ();
1316                 }
1317
1318                 public override void Emit (EmitContext ec)
1319                 {
1320                         throw new NotImplementedException ();
1321                 }
1322         }
1323
1324
1325         /// <summary>
1326         /// For global attributes (assembly, module) we need special handling.
1327         /// Attributes can be located in the several files
1328         /// </summary>
1329         public class GlobalAttribute : Attribute
1330         {
1331                 public readonly NamespaceEntry ns;
1332
1333                 public GlobalAttribute (NamespaceEntry ns, string target,
1334                                         Expression left_expr, string identifier, Arguments[] args, Location loc, bool nameEscaped):
1335                         base (target, left_expr, identifier, args, loc, nameEscaped)
1336                 {
1337                         this.ns = ns;
1338                         this.owners = new Attributable[1];
1339                 }
1340
1341                 public override void AttachTo (Attributable owner)
1342                 {
1343                         if (ExplicitTarget == "assembly") {
1344                                 owners [0] = CodeGen.Assembly;
1345                                 return;
1346                         }
1347                         if (ExplicitTarget == "module") {
1348                                 owners [0] = RootContext.ToplevelTypes;
1349                                 return;
1350                         }
1351                         throw new NotImplementedException ("Unknown global explicit target " + ExplicitTarget);
1352                 }
1353
1354                 void Enter ()
1355                 {
1356                         // RootContext.ToplevelTypes has a single NamespaceEntry which gets overwritten
1357                         // each time a new file is parsed.  However, we need to use the NamespaceEntry
1358                         // in effect where the attribute was used.  Since code elsewhere cannot assume
1359                         // that the NamespaceEntry is right, just overwrite it.
1360                         //
1361                         // Precondition: RootContext.ToplevelTypes == null
1362
1363                         if (RootContext.ToplevelTypes.NamespaceEntry != null)
1364                                 throw new InternalErrorException (Location + " non-null NamespaceEntry");
1365
1366                         RootContext.ToplevelTypes.NamespaceEntry = ns;
1367                 }
1368
1369                 protected override bool IsSecurityActionValid (bool for_assembly)
1370                 {
1371                         return base.IsSecurityActionValid (true);
1372                 }
1373
1374                 void Leave ()
1375                 {
1376                         RootContext.ToplevelTypes.NamespaceEntry = null;
1377                 }
1378
1379                 protected override TypeExpr ResolveAsTypeTerminal (Expression expr, IResolveContext ec, bool silent)
1380                 {
1381                         try {
1382                                 Enter ();
1383                                 return base.ResolveAsTypeTerminal (expr, ec, silent);
1384                         }
1385                         finally {
1386                                 Leave ();
1387                         }
1388                 }
1389
1390                 protected override ConstructorInfo ResolveConstructor (EmitContext ec)
1391                 {
1392                         try {
1393                                 Enter ();
1394                                 return base.ResolveConstructor (ec);
1395                         }
1396                         finally {
1397                                 Leave ();
1398                         }
1399                 }
1400
1401                 protected override bool ResolveNamedArguments (EmitContext ec)
1402                 {
1403                         try {
1404                                 Enter ();
1405                                 return base.ResolveNamedArguments (ec);
1406                         }
1407                         finally {
1408                                 Leave ();
1409                         }
1410                 }
1411         }
1412
1413         public class Attributes {
1414                 public readonly ArrayList Attrs;
1415
1416                 public Attributes (Attribute a)
1417                 {
1418                         Attrs = new ArrayList ();
1419                         Attrs.Add (a);
1420                 }
1421
1422                 public Attributes (ArrayList attrs)
1423                 {
1424                         Attrs = attrs;
1425                 }
1426
1427                 public void AddAttributes (ArrayList attrs)
1428                 {
1429                         Attrs.AddRange (attrs);
1430                 }
1431
1432                 public void AttachTo (Attributable attributable)
1433                 {
1434                         foreach (Attribute a in Attrs)
1435                                 a.AttachTo (attributable);
1436                 }
1437
1438                 public Attributes Clone ()
1439                 {
1440                         ArrayList al = new ArrayList (Attrs.Count);
1441                         foreach (Attribute a in Attrs)
1442                                 al.Add (a.Clone ());
1443
1444                         return new Attributes (al);
1445                 }
1446
1447                 /// <summary>
1448                 /// Checks whether attribute target is valid for the current element
1449                 /// </summary>
1450                 public bool CheckTargets ()
1451                 {
1452                         foreach (Attribute a in Attrs) {
1453                                 if (!a.CheckTarget ())
1454                                         return false;
1455                         }
1456                         return true;
1457                 }
1458
1459                 public Attribute Search (PredefinedAttribute t)
1460                 {
1461                         foreach (Attribute a in Attrs) {
1462                                 if (a.ResolveType () == t)
1463                                         return a;
1464                         }
1465                         return null;
1466                 }
1467
1468                 /// <summary>
1469                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1470                 /// </summary>
1471                 public Attribute[] SearchMulti (PredefinedAttribute t)
1472                 {
1473                         ArrayList ar = null;
1474
1475                         foreach (Attribute a in Attrs) {
1476                                 if (a.ResolveType () == t) {
1477                                         if (ar == null)
1478                                                 ar = new ArrayList ();
1479                                         ar.Add (a);
1480                                 }
1481                         }
1482
1483                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1484                 }
1485
1486                 public void Emit ()
1487                 {
1488                         CheckTargets ();
1489
1490                         ListDictionary ld = Attrs.Count > 1 ? new ListDictionary () : null;
1491
1492                         foreach (Attribute a in Attrs)
1493                                 a.Emit (ld);
1494
1495                         if (ld == null || ld.Count == 0)
1496                                 return;
1497
1498                         foreach (DictionaryEntry d in ld) {
1499                                 if (d.Value == null)
1500                                         continue;
1501
1502                                 foreach (Attribute collision in (ArrayList)d.Value)
1503                                         Report.SymbolRelatedToPreviousError (collision.Location, "");
1504
1505                                 Attribute a = (Attribute)d.Key;
1506                                 Report.Error (579, a.Location, "The attribute `{0}' cannot be applied multiple times",
1507                                         a.GetSignatureForError ());
1508                         }
1509                 }
1510
1511                 public bool Contains (PredefinedAttribute t)
1512                 {
1513                         return Search (t) != null;
1514                 }
1515         }
1516
1517         /// <summary>
1518         /// Helper class for attribute verification routine.
1519         /// </summary>
1520         sealed class AttributeTester
1521         {
1522                 static PtrHashtable analyzed_types;
1523                 static PtrHashtable analyzed_types_obsolete;
1524                 static PtrHashtable analyzed_member_obsolete;
1525                 static PtrHashtable analyzed_method_excluded;
1526                 static PtrHashtable fixed_buffer_cache;
1527
1528                 static object TRUE = new object ();
1529                 static object FALSE = new object ();
1530
1531                 static AttributeTester ()
1532                 {
1533                         Reset ();
1534                 }
1535
1536                 private AttributeTester ()
1537                 {
1538                 }
1539
1540                 public static void Reset ()
1541                 {
1542                         analyzed_types = new PtrHashtable ();
1543                         analyzed_types_obsolete = new PtrHashtable ();
1544                         analyzed_member_obsolete = new PtrHashtable ();
1545                         analyzed_method_excluded = new PtrHashtable ();
1546                         fixed_buffer_cache = new PtrHashtable ();
1547                 }
1548
1549                 public enum Result {
1550                         Ok,
1551                         RefOutArrayError,
1552                         ArrayArrayError
1553                 }
1554
1555                 /// <summary>
1556                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1557                 /// It tests differing only in ref or out, or in array rank.
1558                 /// </summary>
1559                 public static Result AreOverloadedMethodParamsClsCompliant (AParametersCollection pa, AParametersCollection pb)
1560                 {
1561                         Type [] types_a = pa.Types;
1562                         Type [] types_b = pb.Types;
1563                         if (types_a == null || types_b == null)
1564                                 return Result.Ok;
1565
1566                         if (types_a.Length != types_b.Length)
1567                                 return Result.Ok;
1568
1569                         Result result = Result.Ok;
1570                         for (int i = 0; i < types_b.Length; ++i) {
1571                                 Type aType = types_a [i];
1572                                 Type bType = types_b [i];
1573
1574                                 if (aType.IsArray && bType.IsArray) {
1575                                         Type a_el_type = TypeManager.GetElementType (aType);
1576                                         Type b_el_type = TypeManager.GetElementType (bType);
1577                                         if (aType.GetArrayRank () != bType.GetArrayRank () && a_el_type == b_el_type) {
1578                                                 result = Result.RefOutArrayError;
1579                                                 continue;
1580                                         }
1581
1582                                         if (a_el_type.IsArray || b_el_type.IsArray) {
1583                                                 result = Result.ArrayArrayError;
1584                                                 continue;
1585                                         }
1586                                 }
1587
1588                                 if (aType != bType)
1589                                         return Result.Ok;
1590
1591                                 const Parameter.Modifier out_ref_mod = (Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK);
1592                                 if ((pa.FixedParameters[i].ModFlags & out_ref_mod) != (pb.FixedParameters[i].ModFlags & out_ref_mod))
1593                                         result = Result.RefOutArrayError;
1594                         }
1595                         return result;
1596                 }
1597
1598                 /// <summary>
1599                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1600                 /// </summary>
1601                 public static bool IsClsCompliant (Type type)
1602                 {
1603                         if (type == null)
1604                                 return true;
1605
1606                         object type_compliance = analyzed_types[type];
1607                         if (type_compliance != null)
1608                                 return type_compliance == TRUE;
1609
1610                         if (type.IsPointer) {
1611                                 analyzed_types.Add (type, FALSE);
1612                                 return false;
1613                         }
1614
1615                         bool result;
1616                         if (type.IsArray) {
1617                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1618                         } else if (TypeManager.IsNullableType (type)) {
1619                                 result = IsClsCompliant (TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (type) [0]));
1620                         } else {
1621                                 result = AnalyzeTypeCompliance (type);
1622                         }
1623                         analyzed_types.Add (type, result ? TRUE : FALSE);
1624                         return result;
1625                 }
1626
1627                 /// <summary>
1628                 /// Returns IFixedBuffer implementation if field is fixed buffer else null.
1629                 /// </summary>
1630                 public static IFixedBuffer GetFixedBuffer (FieldInfo fi)
1631                 {
1632                         // Fixed buffer helper type is generated as value type
1633                         if (TypeManager.IsReferenceType (fi.FieldType))
1634                                 return null;
1635
1636                         FieldBase fb = TypeManager.GetField (fi);
1637                         if (fb != null) {
1638                                 return fb as IFixedBuffer;
1639                         }
1640
1641                         if (TypeManager.GetConstant (fi) != null)
1642                                 return null;
1643
1644                         object o = fixed_buffer_cache [fi];
1645                         if (o == null) {
1646                                 PredefinedAttribute pa = PredefinedAttributes.Get.FixedBuffer;
1647                                 if (!pa.IsDefined)
1648                                         return null;
1649
1650                                 if (!fi.IsDefined (pa.Type, false)) {
1651                                         fixed_buffer_cache.Add (fi, FALSE);
1652                                         return null;
1653                                 }
1654
1655                                 IFixedBuffer iff = new FixedFieldExternal (fi);
1656                                 fixed_buffer_cache.Add (fi, iff);
1657                                 return iff;
1658                         }
1659
1660                         if (o == FALSE)
1661                                 return null;
1662
1663                         return (IFixedBuffer)o;
1664                 }
1665
1666                 public static void VerifyModulesClsCompliance ()
1667                 {
1668                         Module[] modules = GlobalRootNamespace.Instance.Modules;
1669                         if (modules == null)
1670                                 return;
1671
1672                         // The first module is generated assembly
1673                         for (int i = 1; i < modules.Length; ++i) {
1674                                 Module module = modules [i];
1675                                 if (!GetClsCompliantAttributeValue (module, null)) {
1676                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute " +
1677                                                       "to match the assembly", module.Name);
1678                                         return;
1679                                 }
1680                         }
1681                 }
1682
1683                 public static Type GetImportedIgnoreCaseClsType (string name)
1684                 {
1685                         foreach (Assembly a in GlobalRootNamespace.Instance.Assemblies) {
1686                                 Type t = a.GetType (name, false, true);
1687                                 if (t == null)
1688                                         continue;
1689
1690                                 if (IsClsCompliant (t))
1691                                         return t;
1692                         }
1693                         return null;
1694                 }
1695
1696                 static bool GetClsCompliantAttributeValue (ICustomAttributeProvider attribute_provider, Assembly a)
1697                 {
1698                         PredefinedAttribute pa = PredefinedAttributes.Get.CLSCompliant;
1699                         if (!pa.IsDefined)
1700                                 return false;
1701
1702                         object[] cls_attr = attribute_provider.GetCustomAttributes (pa.Type, false);
1703                         if (cls_attr.Length == 0) {
1704                                 if (a == null)
1705                                         return false;
1706
1707                                 return GetClsCompliantAttributeValue (a, null);
1708                         }
1709
1710                         return ((CLSCompliantAttribute)cls_attr [0]).IsCompliant;
1711                 }
1712
1713                 static bool AnalyzeTypeCompliance (Type type)
1714                 {
1715                         type = TypeManager.DropGenericTypeArguments (type);
1716                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1717                         if (ds != null) {
1718                                 return ds.IsClsComplianceRequired ();
1719                         }
1720
1721                         if (TypeManager.IsGenericParameter (type))
1722                                 return true;
1723
1724                         return GetClsCompliantAttributeValue (type, type.Assembly);
1725                 }
1726
1727                 /// <summary>
1728                 /// Returns instance of ObsoleteAttribute when type is obsolete
1729                 /// </summary>
1730                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1731                 {
1732                         object type_obsolete = analyzed_types_obsolete [type];
1733                         if (type_obsolete == FALSE)
1734                                 return null;
1735
1736                         if (type_obsolete != null)
1737                                 return (ObsoleteAttribute)type_obsolete;
1738
1739                         ObsoleteAttribute result = null;
1740                         if (TypeManager.HasElementType (type)) {
1741                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1742                         } else if (TypeManager.IsGenericParameter (type))
1743                                 result = null;  // TODO: throw new NotSupportedException ()
1744                         else if (TypeManager.IsGenericType (type) && !TypeManager.IsGenericTypeDefinition (type)) {
1745                                 return GetObsoleteAttribute (TypeManager.DropGenericTypeArguments (type));
1746                         } else {
1747                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1748
1749                                 // Type is external, we can get attribute directly
1750                                 if (type_ds == null) {
1751                                         PredefinedAttribute pa = PredefinedAttributes.Get.Obsolete;
1752                                         if (pa.IsDefined) {
1753                                                 object[] attribute = type.GetCustomAttributes (pa.Type, false);
1754                                                 if (attribute.Length == 1)
1755                                                         result = (ObsoleteAttribute) attribute[0];
1756                                         }
1757                                 } else {
1758                                         result = type_ds.GetObsoleteAttribute ();
1759                                 }
1760                         }
1761
1762                         // Cannot use .Add because of corlib bootstrap
1763                         analyzed_types_obsolete [type] = result == null ? FALSE : result;
1764                         return result;
1765                 }
1766
1767                 /// <summary>
1768                 /// Returns instance of ObsoleteAttribute when method is obsolete
1769                 /// </summary>
1770                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1771                 {
1772                         IMethodData mc = TypeManager.GetMethod (mb);
1773                         if (mc != null)
1774                                 return mc.GetObsoleteAttribute ();
1775
1776                         // compiler generated methods are not registered by AddMethod
1777                         if (mb.DeclaringType is TypeBuilder)
1778                                 return null;
1779
1780                         MemberInfo mi = TypeManager.GetPropertyFromAccessor (mb);
1781                         if (mi != null)
1782                                 return GetMemberObsoleteAttribute (mi);
1783
1784                         mi = TypeManager.GetEventFromAccessor (mb);
1785                         if (mi != null)
1786                                 return GetMemberObsoleteAttribute (mi);
1787
1788                         return GetMemberObsoleteAttribute (mb);
1789                 }
1790
1791                 /// <summary>
1792                 /// Returns instance of ObsoleteAttribute when member is obsolete
1793                 /// </summary>
1794                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1795                 {
1796                         object type_obsolete = analyzed_member_obsolete [mi];
1797                         if (type_obsolete == FALSE)
1798                                 return null;
1799
1800                         if (type_obsolete != null)
1801                                 return (ObsoleteAttribute)type_obsolete;
1802
1803                         if ((mi.DeclaringType is TypeBuilder) || TypeManager.IsGenericType (mi.DeclaringType))
1804                                 return null;
1805
1806                         PredefinedAttribute pa = PredefinedAttributes.Get.Obsolete;
1807                         if (!pa.IsDefined)
1808                                 return null;
1809
1810                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, pa.Type, false)
1811                                 as ObsoleteAttribute;
1812                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1813                         return oa;
1814                 }
1815
1816                 /// <summary>
1817                 /// Common method for Obsolete error/warning reporting.
1818                 /// </summary>
1819                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1820                 {
1821                         if (oa.IsError) {
1822                                 Report.Error (619, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1823                                 return;
1824                         }
1825
1826                         if (oa.Message == null || oa.Message.Length == 0) {
1827                                 Report.Warning (612, 1, loc, "`{0}' is obsolete", member);
1828                                 return;
1829                         }
1830                         Report.Warning (618, 2, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1831                 }
1832
1833                 public static bool IsConditionalMethodExcluded (MethodBase mb, Location loc)
1834                 {
1835                         object excluded = analyzed_method_excluded [mb];
1836                         if (excluded != null)
1837                                 return excluded == TRUE ? true : false;
1838
1839                         PredefinedAttribute pa = PredefinedAttributes.Get.Conditional;
1840                         if (!pa.IsDefined)
1841                                 return false;
1842
1843                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (pa.Type, true)
1844                                 as ConditionalAttribute[];
1845                         if (attrs.Length == 0) {
1846                                 analyzed_method_excluded.Add (mb, FALSE);
1847                                 return false;
1848                         }
1849
1850                         foreach (ConditionalAttribute a in attrs) {
1851                                 if (loc.CompilationUnit.IsConditionalDefined (a.ConditionString)) {
1852                                         analyzed_method_excluded.Add (mb, FALSE);
1853                                         return false;
1854                                 }
1855                         }
1856
1857                         analyzed_method_excluded.Add (mb, TRUE);
1858                         return true;
1859                 }
1860
1861                 /// <summary>
1862                 /// Analyzes class whether it has attribute which has ConditionalAttribute
1863                 /// and its condition is not defined.
1864                 /// </summary>
1865                 public static bool IsAttributeExcluded (Type type, Location loc)
1866                 {
1867                         if (!type.IsClass)
1868                                 return false;
1869
1870                         Class class_decl = TypeManager.LookupDeclSpace (type) as Class;
1871
1872                         // TODO: add caching
1873                         // TODO: merge all Type bases attribute caching to one cache to save memory
1874                         PredefinedAttribute pa = PredefinedAttributes.Get.Conditional;
1875                         if (class_decl == null && pa.IsDefined) {
1876                                 object[] attributes = type.GetCustomAttributes (pa.Type, false);
1877                                 foreach (ConditionalAttribute ca in attributes) {
1878                                         if (loc.CompilationUnit.IsConditionalDefined (ca.ConditionString))
1879                                                 return false;
1880                                 }
1881                                 return attributes.Length > 0;
1882                         }
1883
1884                         return class_decl.IsExcluded ();
1885                 }
1886
1887                 public static Type GetCoClassAttribute (Type type)
1888                 {
1889                         TypeContainer tc = TypeManager.LookupInterface (type);
1890                         PredefinedAttribute pa = PredefinedAttributes.Get.CoClass;
1891                         if (tc == null) {
1892                                 if (!pa.IsDefined)
1893                                         return null;
1894
1895                                 object[] o = type.GetCustomAttributes (pa.Type, false);
1896                                 if (o.Length < 1)
1897                                         return null;
1898                                 return ((System.Runtime.InteropServices.CoClassAttribute)o[0]).CoClass;
1899                         }
1900
1901                         if (tc.OptAttributes == null)
1902                                 return null;
1903
1904                         Attribute a = tc.OptAttributes.Search (pa);
1905                         if (a == null)
1906                                 return null;
1907
1908                         return a.GetCoClassAttributeValue ();
1909                 }
1910         }
1911
1912         public class PredefinedAttributes
1913         {
1914                 // Core types
1915                 public readonly PredefinedAttribute ParamArray;
1916                 public readonly PredefinedAttribute Out;
1917
1918                 // Optional types
1919                 public readonly PredefinedAttribute Obsolete;
1920                 public readonly PredefinedAttribute DllImport;
1921                 public readonly PredefinedAttribute MethodImpl;
1922                 public readonly PredefinedAttribute MarshalAs;
1923                 public readonly PredefinedAttribute In;
1924                 public readonly PredefinedAttribute IndexerName;
1925                 public readonly PredefinedAttribute Conditional;
1926                 public readonly PredefinedAttribute CLSCompliant;
1927                 public readonly PredefinedAttribute Security;
1928                 public readonly PredefinedAttribute Required;
1929                 public readonly PredefinedAttribute Guid;
1930                 public readonly PredefinedAttribute AssemblyCulture;
1931                 public readonly PredefinedAttribute AssemblyVersion;
1932                 public readonly PredefinedAttribute ComImport;
1933                 public readonly PredefinedAttribute CoClass;
1934                 public readonly PredefinedAttribute AttributeUsage;
1935                 public readonly PredefinedAttribute DefaultParameterValue;
1936                 public readonly PredefinedAttribute OptionalParameter;
1937
1938                 // New in .NET 2.0
1939                 public readonly PredefinedAttribute DefaultCharset;
1940                 public readonly PredefinedAttribute TypeForwarder;
1941                 public readonly PredefinedAttribute FixedBuffer;
1942                 public readonly PredefinedAttribute CompilerGenerated;
1943                 public readonly PredefinedAttribute InternalsVisibleTo;
1944                 public readonly PredefinedAttribute RuntimeCompatibility;
1945                 public readonly PredefinedAttribute DebuggerHidden;
1946                 public readonly PredefinedAttribute UnsafeValueType;
1947
1948                 // New in .NET 3.5
1949                 public readonly PredefinedAttribute Extension;
1950
1951                 // New in .NET 4.0
1952                 public readonly PredefinedAttribute Dynamic;
1953
1954                 //
1955                 // Optional types which are used as types and for member lookup
1956                 //
1957                 public readonly PredefinedAttribute DefaultMember;
1958                 public readonly PredefinedAttribute DecimalConstant;
1959                 public readonly PredefinedAttribute StructLayout;
1960                 public readonly PredefinedAttribute FieldOffset;
1961
1962                 public static PredefinedAttributes Get = new PredefinedAttributes ();
1963
1964                 private PredefinedAttributes ()
1965                 {
1966                         ParamArray = new PredefinedAttribute ("System", "ParamArrayAttribute");
1967                         Out = new PredefinedAttribute ("System.Runtime.InteropServices", "OutAttribute");
1968
1969                         Obsolete = new PredefinedAttribute ("System", "ObsoleteAttribute");
1970                         DllImport = new PredefinedAttribute ("System.Runtime.InteropServices", "DllImportAttribute");
1971                         MethodImpl = new PredefinedAttribute ("System.Runtime.CompilerServices", "MethodImplAttribute");
1972                         MarshalAs = new PredefinedAttribute ("System.Runtime.InteropServices", "MarshalAsAttribute");
1973                         In = new PredefinedAttribute ("System.Runtime.InteropServices", "InAttribute");
1974                         IndexerName = new PredefinedAttribute ("System.Runtime.CompilerServices", "IndexerNameAttribute");
1975                         Conditional = new PredefinedAttribute ("System.Diagnostics", "ConditionalAttribute");
1976                         CLSCompliant = new PredefinedAttribute ("System", "CLSCompliantAttribute");
1977                         Security = new PredefinedAttribute ("System.Security.Permissions", "SecurityAttribute");
1978                         Required = new PredefinedAttribute ("System.Runtime.CompilerServices", "RequiredAttributeAttribute");
1979                         Guid = new PredefinedAttribute ("System.Runtime.InteropServices", "GuidAttribute");
1980                         AssemblyCulture = new PredefinedAttribute ("System.Reflection", "AssemblyCultureAttribute");
1981                         AssemblyVersion = new PredefinedAttribute ("System.Reflection", "AssemblyVersionAttribute");
1982                         ComImport = new PredefinedAttribute ("System.Runtime.InteropServices", "ComImportAttribute");
1983                         CoClass = new PredefinedAttribute ("System.Runtime.InteropServices", "CoClassAttribute");
1984                         AttributeUsage = new PredefinedAttribute ("System", "AttributeUsageAttribute");
1985                         DefaultParameterValue = new PredefinedAttribute ("System.Runtime.InteropServices", "DefaultParameterValueAttribute");
1986                         OptionalParameter = new PredefinedAttribute ("System.Runtime.InteropServices", "OptionalAttribute");
1987
1988                         DefaultCharset = new PredefinedAttribute ("System.Runtime.InteropServices", "DefaultCharSetAttribute");
1989                         TypeForwarder = new PredefinedAttribute ("System.Runtime.CompilerServices", "TypeForwardedToAttribute");
1990                         FixedBuffer = new PredefinedAttribute ("System.Runtime.CompilerServices", "FixedBufferAttribute");
1991                         CompilerGenerated = new PredefinedAttribute ("System.Runtime.CompilerServices", "CompilerGeneratedAttribute");
1992                         InternalsVisibleTo = new PredefinedAttribute ("System.Runtime.CompilerServices", "InternalsVisibleToAttribute");
1993                         RuntimeCompatibility = new PredefinedAttribute ("System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1994                         DebuggerHidden = new PredefinedAttribute ("System.Diagnostics", "DebuggerHiddenAttribute");
1995                         UnsafeValueType = new PredefinedAttribute ("System.Runtime.CompilerServices", "UnsafeValueTypeAttribute");
1996
1997                         Extension = new PredefinedAttribute ("System.Runtime.CompilerServices", "ExtensionAttribute");
1998
1999                         Dynamic = new PredefinedAttribute ("System.Runtime.CompilerServices", "DynamicAttribute");
2000
2001                         DefaultMember = new PredefinedAttribute ("System.Reflection", "DefaultMemberAttribute");
2002                         DecimalConstant = new PredefinedAttribute ("System.Runtime.CompilerServices", "DecimalConstantAttribute");
2003                         StructLayout = new PredefinedAttribute ("System.Runtime.InteropServices", "StructLayoutAttribute");
2004                         FieldOffset = new PredefinedAttribute ("System.Runtime.InteropServices", "FieldOffsetAttribute");
2005                 }
2006
2007                 public void Initialize ()
2008                 {
2009                         foreach (FieldInfo fi in GetType ().GetFields (BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly)) {
2010                                 ((PredefinedAttribute) fi.GetValue (this)).Resolve (true);
2011                         }
2012                 }
2013
2014                 public static void Reset ()
2015                 {
2016                         Get = new PredefinedAttributes ();
2017                 }
2018         }
2019
2020         public class PredefinedAttribute
2021         {
2022                 Type type;
2023                 CustomAttributeBuilder cab;
2024                 ConstructorInfo ctor;
2025                 readonly string ns, name;
2026
2027                 public PredefinedAttribute (string ns, string name)
2028                 {
2029                         this.ns = ns;
2030                         this.name = name;
2031                 }
2032
2033                 public static bool operator == (Type type, PredefinedAttribute pa)
2034                 {
2035                         return type == pa.type;
2036                 }
2037
2038                 public static bool operator != (Type type, PredefinedAttribute pa)
2039                 {
2040                         return type != pa.type;
2041                 }
2042
2043                 public ConstructorInfo Constructor {
2044                         get { return ctor; }
2045                 }
2046
2047                 public override int GetHashCode ()
2048                 {
2049                         return base.GetHashCode ();
2050                 }
2051
2052                 public override bool Equals (object obj)
2053                 {
2054                         throw new NotSupportedException ();
2055                 }
2056
2057                 public void EmitAttribute (ConstructorBuilder builder)
2058                 {
2059                         if (ResolveBuilder ())
2060                                 builder.SetCustomAttribute (cab);
2061                 }
2062
2063                 public void EmitAttribute (MethodBuilder builder)
2064                 {
2065                         if (ResolveBuilder ())
2066                                 builder.SetCustomAttribute (cab);
2067                 }
2068
2069                 public void EmitAttribute (PropertyBuilder builder)
2070                 {
2071                         if (ResolveBuilder ())
2072                                 builder.SetCustomAttribute (cab);
2073                 }
2074
2075                 public void EmitAttribute (FieldBuilder builder)
2076                 {
2077                         if (ResolveBuilder ())
2078                                 builder.SetCustomAttribute (cab);
2079                 }
2080
2081                 public void EmitAttribute (TypeBuilder builder)
2082                 {
2083                         if (ResolveBuilder ())
2084                                 builder.SetCustomAttribute (cab);
2085                 }
2086
2087                 public void EmitAttribute (AssemblyBuilder builder)
2088                 {
2089                         if (ResolveBuilder ())
2090                                 builder.SetCustomAttribute (cab);
2091                 }
2092
2093                 public void EmitAttribute (ParameterBuilder builder, Location loc)
2094                 {
2095                         if (ResolveBuilder ())
2096                                 builder.SetCustomAttribute (cab);
2097                 }
2098
2099                 public bool IsDefined {
2100                         get { return type != null && type != typeof (PredefinedAttribute); }
2101                 }
2102
2103                 public bool Resolve (bool canFail)
2104                 {
2105                         if (type != null) {
2106                                 if (IsDefined)
2107                                         return true;
2108                                 if (canFail)
2109                                         return false;
2110                         }
2111
2112                         type = TypeManager.CoreLookupType (ns, name, Kind.Class, !canFail);
2113                         if (type == null) {
2114                                 type = typeof (PredefinedAttribute);
2115                                 return false;
2116                         }
2117
2118                         return true;
2119                 }
2120
2121                 bool ResolveBuilder ()
2122                 {
2123                         if (cab != null)
2124                                 return true;
2125
2126                         //
2127                         // Handle all parameter-less attributes as optional
2128                         //
2129                         if (!Resolve (true))
2130                                 return false;
2131
2132                         ConstructorInfo ci = TypeManager.GetPredefinedConstructor (type, Location.Null, Type.EmptyTypes);
2133                         if (ci == null)
2134                                 return false;
2135
2136                         cab = new CustomAttributeBuilder (ci, new object[0]);
2137                         return true;
2138                 }
2139
2140                 public bool ResolveConstructor (Location loc, params Type[] argType)
2141                 {
2142                         if (ctor != null)
2143                                 throw new InternalErrorException ("Predefined ctor redefined");
2144
2145                         if (!Resolve (false))
2146                                 return false;
2147
2148                         ctor = TypeManager.GetPredefinedConstructor (type, loc, argType);
2149                         return ctor != null;
2150                 }
2151
2152                 public Type Type {
2153                         get { return type; }
2154                 }
2155         }
2156 }