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                 //
  33                 // Holds all attributes attached to this element
  34                 //
  35                 protected Attributes attributes;
  36
  37                 public void AddAttributes (Attributes attrs, IMemberContext context)
  38                 {
  39                         if (attrs == null)
  40                                 return;
  41
  42                         if (attributes == null)
  43                                 attributes = attrs;
  44                         else
  45                                 throw new NotImplementedException ();
  46
  47                         attributes.AttachTo (this, context);
  48                 }
  49
  50                 public Attributes OptAttributes {
  51                         get {
  52                                 return attributes;
  53                         }
  54                         set {
  55                                 attributes = value;
  56                         }
  57                 }
  58
  59                 /// <summary>
  60                 /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
  61                 /// </summary>
  62                 public abstract void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb, PredefinedAttributes pa);
  63
  64                 /// <summary>
  65                 /// Returns one AttributeTarget for this element.
  66                 /// </summary>
  67                 public abstract AttributeTargets AttributeTargets { 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                 public readonly string ExplicitTarget;
  81                 public AttributeTargets Target;
  82                 readonly ATypeNameExpression expression;
  83
  84                 Arguments PosArguments;
  85                 Arguments NamedArguments;
  86
  87                 bool resolve_error;
  88                 readonly bool nameEscaped;
  89
  90                 //
  91                 // An attribute can be attached to multiple targets (e.g. multiple fields)
  92                 //
  93                 protected Attributable[] targets;
  94
  95                 //
  96                 // A member context for the attribute, it's much easier to hold it here
  97                 // than trying to pull it during resolve
  98                 //
  99                 IMemberContext context;
 100
 101                 static readonly AttributeUsageAttribute DefaultUsageAttribute = new AttributeUsageAttribute (AttributeTargets.All);
 102                 static Assembly orig_sec_assembly;
 103                 public static readonly object[] EmptyObject = new object [0];
 104
 105                 // non-null if named args present after Resolve () is called
 106                 PropertyInfo [] prop_info_arr;
 107                 FieldInfo [] field_info_arr;
 108                 object [] field_values_arr;
 109                 object [] prop_values_arr;
 110                 object [] pos_values;
 111
 112                 static PtrHashtable usage_attr_cache;
 113                 // Cache for parameter-less attributes
 114                 static PtrHashtable att_cache;
 115
 116                 public Attribute (string target, ATypeNameExpression expr, Arguments[] args, Location loc, bool nameEscaped)
 117                 {
 118                         this.expression = expr;
 119                         if (args != null) {
 120                                 PosArguments = args [0];
 121                                 NamedArguments = args [1];
 122                         }
 123                         this.loc = loc;
 124                         ExplicitTarget = target;
 125                         this.nameEscaped = nameEscaped;
 126                 }
 127
 128                 public Attribute Clone ()
 129                 {
 130                         Attribute a = new Attribute (ExplicitTarget, expression, null, loc, nameEscaped);
 131                         a.PosArguments = PosArguments;
 132                         a.NamedArguments = NamedArguments;
 133                         return a;
 134                 }
 135
 136                 static Attribute ()
 137                 {
 138                         Reset ();
 139                 }
 140
 141                 public static void Reset ()
 142                 {
 143                         usage_attr_cache = new PtrHashtable ();
 144                         att_cache = new PtrHashtable ();
 145                 }
 146
 147                 //
 148                 // When the same attribute is attached to multiple fiels
 149                 // we use @target field as a list of targets. The attribute
 150                 // has to be resolved only once but emitted for each target.
 151                 //
 152                 public virtual void AttachTo (Attributable target, IMemberContext context)
 153                 {
 154                         if (this.targets == null) {
 155                                 this.targets = new Attributable[] { target };
 156                                 this.context = context;
 157                                 return;
 158                         }
 159
 160                         // Resize target array
 161                         Attributable[] new_array = new Attributable [this.targets.Length + 1];
 162                         targets.CopyTo (new_array, 0);
 163                         new_array [targets.Length] = target;
 164                         this.targets = new_array;
 165
 166                         // No need to update context, different targets cannot have
 167                         // different contexts, it's enough to remove same attributes
 168                         // from secondary members.
 169
 170                         target.OptAttributes = null;
 171                 }
 172
 173                 static void Error_InvalidNamedArgument (ResolveContext rc, NamedArgument name)
 174                 {
 175                         rc.Report.Error (617, name.Name.Location, "`{0}' is not a valid named attribute argument. Named attribute arguments " +
 176                                       "must be fields which are not readonly, static, const or read-write properties which are " +
 177                                       "public and not static",
 178                               name.Name.Value);
 179                 }
 180
 181                 static void Error_InvalidNamedArgumentType (ResolveContext rc, NamedArgument name)
 182                 {
 183                         rc.Report.Error (655, name.Name.Location,
 184                                 "`{0}' is not a valid named attribute argument because it is not a valid attribute parameter type",
 185                                 name.Name.Value);
 186                 }
 187
 188                 public static void Error_AttributeArgumentNotValid (ResolveContext rc, Location loc)
 189                 {
 190                         rc.Report.Error (182, loc,
 191                                       "An attribute argument must be a constant expression, typeof " +
 192                                       "expression or array creation expression");
 193                 }
 194
 195                 public void Error_MissingGuidAttribute ()
 196                 {
 197                         Report.Error (596, Location, "The Guid attribute must be specified with the ComImport attribute");
 198                 }
 199
 200                 public void Error_MisusedExtensionAttribute ()
 201                 {
 202                         Report.Error (1112, Location, "Do not use `{0}' directly. Use parameter modifier `this' instead", GetSignatureForError ());
 203                 }
 204
 205                 /// <summary>
 206                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 207                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 208                 /// </summary>
 209                 public void Error_AttributeEmitError (string inner)
 210                 {
 211                         Report.Error (647, Location, "Error during emitting `{0}' attribute. The reason is `{1}'",
 212                                       TypeManager.CSharpName (Type), inner);
 213                 }
 214
 215                 public void Error_InvalidSecurityParent ()
 216                 {
 217                         Error_AttributeEmitError ("it is attached to invalid parent");
 218                 }
 219
 220                 Attributable Owner {
 221                         get {
 222                                 return targets [0];
 223                         }
 224                 }
 225
 226                 protected virtual TypeExpr ResolveAsTypeTerminal (Expression expr, IMemberContext ec)
 227                 {
 228                         return expr.ResolveAsTypeTerminal (ec, false);
 229                 }
 230
 231                 Type ResolvePossibleAttributeType (ATypeNameExpression expr, ref bool is_attr)
 232                 {
 233                         TypeExpr te = ResolveAsTypeTerminal (expr, context);
 234                         if (te == null)
 235                                 return null;
 236
 237                         Type t = te.Type;
 238                         if (TypeManager.IsSubclassOf (t, TypeManager.attribute_type)) {
 239                                 is_attr = true;
 240                         } else {
 241                                 Report.SymbolRelatedToPreviousError (t);
 242                                 Report.Error (616, Location, "`{0}': is not an attribute class", TypeManager.CSharpName (t));
 243                         }
 244                         return t;
 245                 }
 246
 247                 /// <summary>
 248                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 249                 /// </summary>
 250                 void ResolveAttributeType ()
 251                 {
 252                         SessionReportPrinter resolve_printer = new SessionReportPrinter ();
 253                         ReportPrinter prev_recorder = context.Compiler.Report.SetPrinter (resolve_printer);
 254
 255                         bool t1_is_attr = false;
 256                         bool t2_is_attr = false;
 257                         Type t1, t2;
 258                         ATypeNameExpression expanded = null;
 259
 260                         try {
 261                                 t1 = ResolvePossibleAttributeType (expression, ref t1_is_attr);
 262
 263                                 if (nameEscaped) {
 264                                         t2 = null;
 265                                 } else {
 266                                         expanded = (ATypeNameExpression) expression.Clone (null);
 267                                         expanded.Name += "Attribute";
 268
 269                                         t2 = ResolvePossibleAttributeType (expanded, ref t2_is_attr);
 270                                 }
 271
 272                                 resolve_printer.EndSession ();
 273                         } finally {
 274                                 context.Compiler.Report.SetPrinter (prev_recorder);
 275                         }
 276
 277                         if (t1_is_attr && t2_is_attr) {
 278                                 Report.Error (1614, Location, "`{0}' is ambiguous between `{1}' and `{2}'. Use either `@{0}' or `{0}Attribute'",
 279                                         GetSignatureForError (), expression.GetSignatureForError (), expanded.GetSignatureForError ());
 280                                 resolve_error = true;
 281                                 return;
 282                         }
 283
 284                         if (t1_is_attr) {
 285                                 Type = t1;
 286                                 return;
 287                         }
 288
 289                         if (t2_is_attr) {
 290                                 Type = t2;
 291                                 return;
 292                         }
 293
 294                         resolve_printer.Merge (prev_recorder);
 295                         resolve_error = true;
 296                 }
 297
 298                 public virtual Type ResolveType ()
 299                 {
 300                         if (Type == null && !resolve_error)
 301                                 ResolveAttributeType ();
 302                         return Type;
 303                 }
 304
 305                 public override string GetSignatureForError ()
 306                 {
 307                         if (Type != null)
 308                                 return TypeManager.CSharpName (Type);
 309
 310                         return expression.GetSignatureForError ();
 311                 }
 312
 313                 public bool HasSecurityAttribute {
 314                         get {
 315                                 PredefinedAttribute pa = PredefinedAttributes.Get.Security;
 316                                 return pa.IsDefined && TypeManager.IsSubclassOf (type, pa.Type);
 317                         }
 318                 }
 319
 320                 public bool IsValidSecurityAttribute ()
 321                 {
 322                         return HasSecurityAttribute && IsSecurityActionValid (false);
 323                 }
 324
 325                 static bool IsValidArgumentType (Type t)
 326                 {
 327                         if (t.IsArray)
 328                                 t = TypeManager.GetElementType (t);
 329
 330                         return t == TypeManager.string_type ||
 331                                 TypeManager.IsPrimitiveType (t) ||
 332                                 TypeManager.IsEnumType (t) ||
 333                                 t == TypeManager.object_type ||
 334                                 t == TypeManager.type_type;
 335                 }
 336
 337                 // TODO: Don't use this ambiguous value
 338                 public string Name {
 339                         get { return expression.Name; }
 340                 }
 341
 342                 void ApplyModuleCharSet ()
 343                 {
 344                         if (Type != PredefinedAttributes.Get.DllImport)
 345                                 return;
 346
 347                         if (!RootContext.ToplevelTypes.HasDefaultCharSet)
 348                                 return;
 349
 350                         const string CharSetEnumMember = "CharSet";
 351                         if (NamedArguments == null) {
 352                                 NamedArguments = new Arguments (1);
 353                         } else {
 354                                 foreach (NamedArgument a in NamedArguments) {
 355                                         if (a.Name.Value == CharSetEnumMember)
 356                                                 return;
 357                                 }
 358                         }
 359
 360                         NamedArguments.Add (new NamedArgument (new LocatedToken (loc, CharSetEnumMember),
 361                                 Constant.CreateConstant (typeof (CharSet), RootContext.ToplevelTypes.DefaultCharSet, Location)));
 362                 }
 363
 364                 Report Report {
 365                         get { return context.Compiler.Report; }
 366                 }
 367
 368                 public CustomAttributeBuilder Resolve ()
 369                 {
 370                         if (resolve_error)
 371                                 return null;
 372
 373                         resolve_error = true;
 374
 375                         if (Type == null) {
 376                                 ResolveAttributeType ();
 377                                 if (Type == null)
 378                                         return null;
 379                         }
 380
 381                         if (Type.IsAbstract) {
 382                                 Report.Error (653, Location, "Cannot apply attribute class `{0}' because it is abstract", GetSignatureForError ());
 383                                 return null;
 384                         }
 385
 386                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (Type);
 387                         if (obsolete_attr != null) {
 388                                 AttributeTester.Report_ObsoleteMessage (obsolete_attr, TypeManager.CSharpName (Type), Location, Report);
 389                         }
 390
 391                         if (PosArguments == null && NamedArguments == null) {
 392                                 object o = att_cache [Type];
 393                                 if (o != null) {
 394                                         resolve_error = false;
 395                                         return (CustomAttributeBuilder)o;
 396                                 }
 397                         }
 398
 399                         ResolveContext rc = new ResolveContext (context, ResolveContext.Options.ConstantScope);
 400                         ConstructorInfo ctor = ResolveConstructor (rc);
 401                         if (ctor == null) {
 402                                 if (Type is TypeBuilder &&
 403                                     TypeManager.LookupDeclSpace (Type).MemberCache == null)
 404                                         // The attribute type has been DefineType'd, but not Defined.  Let's not treat it as an error.
 405                                         // It'll be resolved again when the attached-to entity is emitted.
 406                                         resolve_error = false;
 407                                 return null;
 408                         }
 409
 410                         ApplyModuleCharSet ();
 411
 412                         CustomAttributeBuilder cb;
 413                         try {
 414                                 // SRE does not allow private ctor but we want to report all source code errors
 415                                 if (ctor.IsPrivate)
 416                                         return null;
 417
 418                                 if (NamedArguments == null) {
 419                                         cb = new CustomAttributeBuilder (ctor, pos_values);
 420
 421                                         if (pos_values.Length == 0)
 422                                                 att_cache.Add (Type, cb);
 423
 424                                         resolve_error = false;
 425                                         return cb;
 426                                 }
 427
 428                                 if (!ResolveNamedArguments (rc)) {
 429                                         return null;
 430                                 }
 431
 432                                 cb = new CustomAttributeBuilder (ctor, pos_values,
 433                                                 prop_info_arr, prop_values_arr,
 434                                                 field_info_arr, field_values_arr);
 435
 436                                 resolve_error = false;
 437                                 return cb;
 438                         }
 439                         catch (Exception) {
 440                                 Error_AttributeArgumentNotValid (rc, Location);
 441                                 return null;
 442                         }
 443                 }
 444
 445                 protected virtual ConstructorInfo ResolveConstructor (ResolveContext ec)
 446                 {
 447                         if (PosArguments != null) {
 448                                 bool dynamic;
 449                                 PosArguments.Resolve (ec, out dynamic);
 450                                 if (dynamic)
 451                                         throw new NotImplementedException ("dynamic");
 452                         }
 453
 454                         MethodGroupExpr mg = MemberLookupFinal (ec, ec.CurrentType,
 455                                 Type, ConstructorInfo.ConstructorName, MemberTypes.Constructor,
 456                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 457                                 Location) as MethodGroupExpr;
 458
 459                         if (mg == null)
 460                                 throw new NotImplementedException ();
 461
 462                         mg = mg.OverloadResolve (ec, ref PosArguments, false, Location);
 463                         if (mg == null)
 464                                 return null;
 465
 466                         ConstructorInfo constructor = (ConstructorInfo)mg;
 467                         if (PosArguments == null) {
 468                                 pos_values = EmptyObject;
 469                                 return constructor;
 470                         }
 471
 472                         AParametersCollection pd = TypeManager.GetParameterData (constructor);
 473
 474                         if (!PosArguments.GetAttributableValue (ec, out pos_values))
 475                                 return null;
 476
 477                         // Here we do the checks which should be done by corlib or by runtime.
 478                         // However Zoltan doesn't like it and every Mono compiler has to do it again.
 479                         PredefinedAttributes pa = PredefinedAttributes.Get;
 480                         if (Type == pa.Guid) {
 481                                 try {
 482                                         new Guid ((string)pos_values [0]);
 483                                 }
 484                                 catch (Exception e) {
 485                                         Error_AttributeEmitError (e.Message);
 486                                         return null;
 487                                 }
 488                         }
 489
 490                         if (Type == pa.AttributeUsage && (int)pos_values [0] == 0) {
 491                                 ec.Report.Error (591, Location, "Invalid value for argument to `System.AttributeUsage' attribute");
 492                                 return null;
 493                         }
 494
 495                         if (Type == pa.IndexerName || Type == pa.Conditional) {
 496                                 string v = pos_values [0] as string;
 497                                 if (!Tokenizer.IsValidIdentifier (v) || Tokenizer.IsKeyword (v)) {
 498                                         ec.Report.Error (633, PosArguments [0].Expr.Location,
 499                                                 "The argument to the `{0}' attribute must be a valid identifier", GetSignatureForError ());
 500                                         return null;
 501                                 }
 502                         }
 503
 504                         if (Type == pa.MethodImpl && pos_values.Length == 1 &&
 505                                 pd.Types [0] == TypeManager.short_type &&
 506                                 !System.Enum.IsDefined (typeof (MethodImplOptions), pos_values [0].ToString ())) {
 507                                 Error_AttributeEmitError ("Incorrect argument value.");
 508                                 return null;
 509                         }
 510
 511                         return constructor;
 512                 }
 513
 514                 protected virtual bool ResolveNamedArguments (ResolveContext ec)
 515                 {
 516                         int named_arg_count = NamedArguments.Count;
 517
 518                         ArrayList field_infos = new ArrayList (named_arg_count);
 519                         ArrayList prop_infos  = new ArrayList (named_arg_count);
 520                         ArrayList field_values = new ArrayList (named_arg_count);
 521                         ArrayList prop_values = new ArrayList (named_arg_count);
 522
 523                         ArrayList seen_names = new ArrayList (named_arg_count);
 524
 525                         foreach (NamedArgument a in NamedArguments) {
 526                                 string name = a.Name.Value;
 527                                 if (seen_names.Contains (name)) {
 528                                         ec.Report.Error (643, a.Name.Location, "Duplicate named attribute `{0}' argument", name);
 529                                         continue;
 530                                 }
 531
 532                                 seen_names.Add (name);
 533
 534                                 a.Resolve (ec);
 535
 536                                 Expression member = Expression.MemberLookup (ec.Compiler,
 537                                         ec.CurrentType, Type, name,
 538                                         MemberTypes.All,
 539                                         BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static,
 540                                         Location);
 541
 542                                 if (member == null) {
 543                                         member = Expression.MemberLookup (ec.Compiler, ec.CurrentType, Type, name,
 544                                                 MemberTypes.All, BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static,
 545                                                 Location);
 546
 547                                         if (member != null) {
 548                                                 ec.Report.SymbolRelatedToPreviousError (member.Type);
 549                                                 Expression.ErrorIsInaccesible (Location, member.GetSignatureForError (), ec.Report);
 550                                                 return false;
 551                                         }
 552                                 }
 553
 554                                 if (member == null){
 555                                         Expression.Error_TypeDoesNotContainDefinition (ec, Location, Type, name);
 556                                         return false;
 557                                 }
 558
 559                                 if (!(member is PropertyExpr || member is FieldExpr)) {
 560                                         Error_InvalidNamedArgument (ec, a);
 561                                         return false;
 562                                 }
 563
 564                                 ObsoleteAttribute obsolete_attr;
 565
 566                                 if (member is PropertyExpr) {
 567                                         PropertyInfo pi = ((PropertyExpr) member).PropertyInfo;
 568
 569                                         if (!pi.CanWrite || !pi.CanRead || pi.GetGetMethod ().IsStatic) {
 570                                                 ec.Report.SymbolRelatedToPreviousError (pi);
 571                                                 Error_InvalidNamedArgument (ec, a);
 572                                                 return false;
 573                                         }
 574
 575                                         if (!IsValidArgumentType (member.Type)) {
 576                                                 ec.Report.SymbolRelatedToPreviousError (pi);
 577                                                 Error_InvalidNamedArgumentType (ec, a);
 578                                                 return false;
 579                                         }
 580
 581                                         object value;
 582                                         if (!a.Expr.GetAttributableValue (ec, member.Type, out value))
 583                                                 return false;
 584
 585                                         PropertyBase pb = TypeManager.GetProperty (pi);
 586                                         if (pb != null)
 587                                                 obsolete_attr = pb.GetObsoleteAttribute ();
 588                                         else
 589                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (pi);
 590
 591                                         prop_values.Add (value);
 592                                         prop_infos.Add (pi);
 593
 594                                 } else {
 595                                         FieldInfo fi = ((FieldExpr) member).FieldInfo;
 596
 597                                         if (fi.IsInitOnly || fi.IsStatic) {
 598                                                 Error_InvalidNamedArgument (ec, a);
 599                                                 return false;
 600                                         }
 601
 602                                         if (!IsValidArgumentType (member.Type)) {
 603                                                 ec.Report.SymbolRelatedToPreviousError (fi);
 604                                                 Error_InvalidNamedArgumentType (ec, a);
 605                                                 return false;
 606                                         }
 607
 608                                         object value;
 609                                         if (!a.Expr.GetAttributableValue (ec, member.Type, out value))
 610                                                 return false;
 611
 612                                         FieldBase fb = TypeManager.GetField (fi);
 613                                         if (fb != null)
 614                                                 obsolete_attr = fb.GetObsoleteAttribute ();
 615                                         else
 616                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (fi);
 617
 618                                         field_values.Add (value);
 619                                         field_infos.Add (fi);
 620                                 }
 621
 622                                 if (obsolete_attr != null && !context.IsObsolete)
 623                                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, member.GetSignatureForError (), member.Location, Report);
 624                         }
 625
 626                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 627                         field_info_arr = new FieldInfo [field_infos.Count];
 628                         field_values_arr = new object [field_values.Count];
 629                         prop_values_arr = new object [prop_values.Count];
 630
 631                         field_infos.CopyTo  (field_info_arr, 0);
 632                         field_values.CopyTo (field_values_arr, 0);
 633
 634                         prop_values.CopyTo  (prop_values_arr, 0);
 635                         prop_infos.CopyTo   (prop_info_arr, 0);
 636
 637                         return true;
 638                 }
 639
 640                 /// <summary>
 641                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 642                 /// </summary>
 643                 public string GetValidTargets ()
 644                 {
 645                         StringBuilder sb = new StringBuilder ();
 646                         AttributeTargets targets = GetAttributeUsage (Type).ValidOn;
 647
 648                         if ((targets & AttributeTargets.Assembly) != 0)
 649                                 sb.Append ("assembly, ");
 650
 651                         if ((targets & AttributeTargets.Module) != 0)
 652                                 sb.Append ("module, ");
 653
 654                         if ((targets & AttributeTargets.Class) != 0)
 655                                 sb.Append ("class, ");
 656
 657                         if ((targets & AttributeTargets.Struct) != 0)
 658                                 sb.Append ("struct, ");
 659
 660                         if ((targets & AttributeTargets.Enum) != 0)
 661                                 sb.Append ("enum, ");
 662
 663                         if ((targets & AttributeTargets.Constructor) != 0)
 664                                 sb.Append ("constructor, ");
 665
 666                         if ((targets & AttributeTargets.Method) != 0)
 667                                 sb.Append ("method, ");
 668
 669                         if ((targets & AttributeTargets.Property) != 0)
 670                                 sb.Append ("property, indexer, ");
 671
 672                         if ((targets & AttributeTargets.Field) != 0)
 673                                 sb.Append ("field, ");
 674
 675                         if ((targets & AttributeTargets.Event) != 0)
 676                                 sb.Append ("event, ");
 677
 678                         if ((targets & AttributeTargets.Interface) != 0)
 679                                 sb.Append ("interface, ");
 680
 681                         if ((targets & AttributeTargets.Parameter) != 0)
 682                                 sb.Append ("parameter, ");
 683
 684                         if ((targets & AttributeTargets.Delegate) != 0)
 685                                 sb.Append ("delegate, ");
 686
 687                         if ((targets & AttributeTargets.ReturnValue) != 0)
 688                                 sb.Append ("return, ");
 689
 690 #if NET_2_0
 691                         if ((targets & AttributeTargets.GenericParameter) != 0)
 692                                 sb.Append ("type parameter, ");
 693 #endif
 694                         return sb.Remove (sb.Length - 2, 2).ToString ();
 695                 }
 696
 697                 /// <summary>
 698                 /// Returns AttributeUsage attribute based on types hierarchy
 699                 /// </summary>
 700                 static AttributeUsageAttribute GetAttributeUsage (Type type)
 701                 {
 702                         AttributeUsageAttribute ua = usage_attr_cache [type] as AttributeUsageAttribute;
 703                         if (ua != null)
 704                                 return ua;
 705
 706                         Class attr_class = TypeManager.LookupClass (type);
 707                         PredefinedAttribute pa = PredefinedAttributes.Get.AttributeUsage;
 708
 709                         if (attr_class == null) {
 710                                 if (!pa.IsDefined)
 711                                         return new AttributeUsageAttribute (0);
 712
 713                                 object[] usage_attr = type.GetCustomAttributes (pa.Type, true);
 714                                 ua = (AttributeUsageAttribute)usage_attr [0];
 715                                 usage_attr_cache.Add (type, ua);
 716                                 return ua;
 717                         }
 718
 719                         Attribute a = null;
 720                         if (attr_class.OptAttributes != null)
 721                                 a = attr_class.OptAttributes.Search (pa);
 722
 723                         if (a == null) {
 724                                 if (attr_class.TypeBuilder.BaseType != TypeManager.attribute_type)
 725                                         ua = GetAttributeUsage (attr_class.TypeBuilder.BaseType);
 726                                 else
 727                                         ua = DefaultUsageAttribute;
 728                         } else {
 729                                 ua = a.GetAttributeUsageAttribute ();
 730                         }
 731
 732                         usage_attr_cache.Add (type, ua);
 733                         return ua;
 734                 }
 735
 736                 AttributeUsageAttribute GetAttributeUsageAttribute ()
 737                 {
 738                         if (pos_values == null)
 739                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 740                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 741                                 Resolve ();
 742
 743                         if (resolve_error)
 744                                 return DefaultUsageAttribute;
 745
 746                         AttributeUsageAttribute usage_attribute = new AttributeUsageAttribute ((AttributeTargets)pos_values [0]);
 747
 748                         object field = GetPropertyValue ("AllowMultiple");
 749                         if (field != null)
 750                                 usage_attribute.AllowMultiple = (bool)field;
 751
 752                         field = GetPropertyValue ("Inherited");
 753                         if (field != null)
 754                                 usage_attribute.Inherited = (bool)field;
 755
 756                         return usage_attribute;
 757                 }
 758
 759                 /// <summary>
 760                 /// Returns custom name of indexer
 761                 /// </summary>
 762                 public string GetIndexerAttributeValue ()
 763                 {
 764                         if (pos_values == null)
 765                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 766                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 767                                 Resolve ();
 768
 769                         if (resolve_error)
 770                                 return null;
 771
 772                         return pos_values [0] as string;
 773                 }
 774
 775                 /// <summary>
 776                 /// Returns condition of ConditionalAttribute
 777                 /// </summary>
 778                 public string GetConditionalAttributeValue ()
 779                 {
 780                         if (pos_values == null)
 781                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 782                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 783                                 Resolve ();
 784
 785                         if (resolve_error)
 786                                 return null;
 787
 788                         return (string)pos_values [0];
 789                 }
 790
 791                 /// <summary>
 792                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 793                 /// </summary>
 794                 public ObsoleteAttribute GetObsoleteAttribute ()
 795                 {
 796                         if (pos_values == null)
 797                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 798                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 799                                 Resolve ();
 800
 801                         if (resolve_error)
 802                                 return null;
 803
 804                         if (pos_values == null || pos_values.Length == 0)
 805                                 return new ObsoleteAttribute ();
 806
 807                         if (pos_values.Length == 1)
 808                                 return new ObsoleteAttribute ((string)pos_values [0]);
 809
 810                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 811                 }
 812
 813                 /// <summary>
 814                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 815                 /// before ApplyAttribute. We need to resolve the arguments.
 816                 /// This situation occurs when class deps is differs from Emit order.
 817                 /// </summary>
 818                 public bool GetClsCompliantAttributeValue ()
 819                 {
 820                         if (pos_values == null)
 821                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 822                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 823                                 Resolve ();
 824
 825                         if (resolve_error)
 826                                 return false;
 827
 828                         return (bool)pos_values [0];
 829                 }
 830
 831                 public Type GetCoClassAttributeValue ()
 832                 {
 833                         if (pos_values == null)
 834                                 Resolve ();
 835
 836                         if (resolve_error)
 837                                 return null;
 838
 839                         return (Type)pos_values [0];
 840                 }
 841
 842                 public bool CheckTarget ()
 843                 {
 844                         string[] valid_targets = Owner.ValidAttributeTargets;
 845                         if (ExplicitTarget == null || ExplicitTarget == valid_targets [0]) {
 846                                 Target = Owner.AttributeTargets;
 847                                 return true;
 848                         }
 849
 850                         // TODO: we can skip the first item
 851                         if (((IList) valid_targets).Contains (ExplicitTarget)) {
 852                                 switch (ExplicitTarget) {
 853                                 case "return": Target = AttributeTargets.ReturnValue; return true;
 854                                 case "param": Target = AttributeTargets.Parameter; return true;
 855                                 case "field": Target = AttributeTargets.Field; return true;
 856                                 case "method": Target = AttributeTargets.Method; return true;
 857                                 case "property": Target = AttributeTargets.Property; return true;
 858                                 }
 859                                 throw new InternalErrorException ("Unknown explicit target: " + ExplicitTarget);
 860                         }
 861
 862                         StringBuilder sb = new StringBuilder ();
 863                         foreach (string s in valid_targets) {
 864                                 sb.Append (s);
 865                                 sb.Append (", ");
 866                         }
 867                         sb.Remove (sb.Length - 2, 2);
 868                         Report.Error (657, Location, "`{0}' is not a valid attribute location for this declaration. " +
 869                                 "Valid attribute locations for this declaration are `{1}'", ExplicitTarget, sb.ToString ());
 870                         return false;
 871                 }
 872
 873                 /// <summary>
 874                 /// Tests permitted SecurityAction for assembly or other types
 875                 /// </summary>
 876                 protected virtual bool IsSecurityActionValid (bool for_assembly)
 877                 {
 878                         SecurityAction action = GetSecurityActionValue ();
 879
 880                         switch (action) {
 881                         case SecurityAction.Demand:
 882                         case SecurityAction.Assert:
 883                         case SecurityAction.Deny:
 884                         case SecurityAction.PermitOnly:
 885                         case SecurityAction.LinkDemand:
 886                         case SecurityAction.InheritanceDemand:
 887                                 if (!for_assembly)
 888                                         return true;
 889                                 break;
 890
 891                         case SecurityAction.RequestMinimum:
 892                         case SecurityAction.RequestOptional:
 893                         case SecurityAction.RequestRefuse:
 894                                 if (for_assembly)
 895                                         return true;
 896                                 break;
 897
 898                         default:
 899                                 Error_AttributeEmitError ("SecurityAction is out of range");
 900                                 return false;
 901                         }
 902
 903                         Error_AttributeEmitError (String.Concat ("SecurityAction `", action, "' is not valid for this declaration"));
 904                         return false;
 905                 }
 906
 907                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 908                 {
 909                         return (SecurityAction)pos_values [0];
 910                 }
 911
 912                 /// <summary>
 913                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 914                 /// </summary>
 915                 /// <returns></returns>
 916                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 917                 {
 918                         Type orig_assembly_type = null;
 919
 920                         if (TypeManager.LookupDeclSpace (Type) != null) {
 921                                 if (!RootContext.StdLib) {
 922                                         orig_assembly_type = Type.GetType (Type.FullName);
 923                                 } else {
 924                                         string orig_version_path = Environment.GetEnvironmentVariable ("__SECURITY_BOOTSTRAP_DB");
 925                                         if (orig_version_path == null) {
 926                                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 927                                                 return;
 928                                         }
 929
 930                                         if (orig_sec_assembly == null) {
 931                                                 string file = Path.Combine (orig_version_path, Driver.OutputFile);
 932                                                 orig_sec_assembly = Assembly.LoadFile (file);
 933                                         }
 934
 935                                         orig_assembly_type = orig_sec_assembly.GetType (Type.FullName, true);
 936                                         if (orig_assembly_type == null) {
 937                                                 Report.Warning (-112, 1, Location, "Self-referenced security attribute `{0}' " +
 938                                                                 "was not found in previous version of assembly");
 939                                                 return;
 940                                         }
 941                                 }
 942                         }
 943
 944                         SecurityAttribute sa;
 945                         // For all non-selfreferencing security attributes we can avoid all hacks
 946                         if (orig_assembly_type == null) {
 947                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 948
 949                                 if (prop_info_arr != null) {
 950                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 951                                                 PropertyInfo pi = prop_info_arr [i];
 952                                                 pi.SetValue (sa, prop_values_arr [i], null);
 953                                         }
 954                                 }
 955                         } else {
 956                                 // HACK: All security attributes have same ctor syntax
 957                                 sa = (SecurityAttribute) Activator.CreateInstance (orig_assembly_type, new object[] { GetSecurityActionValue () } );
 958
 959                                 // All types are from newly created assembly but for invocation with old one we need to convert them
 960                                 if (prop_info_arr != null) {
 961                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 962                                                 PropertyInfo emited_pi = prop_info_arr [i];
 963                                                 // FIXME: We are missing return type filter
 964                                                 // TODO: pi can be null
 965                                                 PropertyInfo pi = orig_assembly_type.GetProperty (emited_pi.Name);
 966
 967                                                 object old_instance = TypeManager.IsEnumType (pi.PropertyType) ?
 968                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
 969                                                         prop_values_arr [i];
 970
 971                                                 pi.SetValue (sa, old_instance, null);
 972                                         }
 973                                 }
 974                         }
 975
 976                         IPermission perm;
 977                         perm = sa.CreatePermission ();
 978                         SecurityAction action = GetSecurityActionValue ();
 979
 980                         // IS is correct because for corlib we are using an instance from old corlib
 981                         if (!(perm is System.Security.CodeAccessPermission)) {
 982                                 switch (action) {
 983                                 case SecurityAction.Demand:
 984                                         action = (SecurityAction)13;
 985                                         break;
 986                                 case SecurityAction.LinkDemand:
 987                                         action = (SecurityAction)14;
 988                                         break;
 989                                 case SecurityAction.InheritanceDemand:
 990                                         action = (SecurityAction)15;
 991                                         break;
 992                                 }
 993                         }
 994
 995                         PermissionSet ps = (PermissionSet)permissions [action];
 996                         if (ps == null) {
 997                                 if (sa is PermissionSetAttribute)
 998                                         ps = new PermissionSet (sa.Unrestricted ? PermissionState.Unrestricted : PermissionState.None);
 999                                 else
1000                                         ps = new PermissionSet (PermissionState.None);
1001
1002                                 permissions.Add (action, ps);
1003                         } else if (!ps.IsUnrestricted () && (sa is PermissionSetAttribute) && sa.Unrestricted) {
1004                                 ps = ps.Union (new PermissionSet (PermissionState.Unrestricted));
1005                                 permissions [action] = ps;
1006                         }
1007                         ps.AddPermission (perm);
1008                 }
1009
1010                 public object GetPropertyValue (string name)
1011                 {
1012                         if (prop_info_arr == null)
1013                                 return null;
1014
1015                         for (int i = 0; i < prop_info_arr.Length; ++i) {
1016                                 if (prop_info_arr [i].Name == name)
1017                                         return prop_values_arr [i];
1018                         }
1019
1020                         return null;
1021                 }
1022
1023                 //
1024                 // Theoretically, we can get rid of this, since FieldBuilder.SetCustomAttribute()
1025                 // and ParameterBuilder.SetCustomAttribute() are supposed to handle this attribute.
1026                 // However, we can't, since it appears that the .NET 1.1 SRE hangs when given a MarshalAsAttribute.
1027                 //
1028 #if !NET_2_0
1029                 public UnmanagedMarshal GetMarshal (Attributable attr)
1030                 {
1031                         UnmanagedType UnmanagedType;
1032                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (UnmanagedType))
1033                                 UnmanagedType = (UnmanagedType) System.Enum.ToObject (typeof (UnmanagedType), pos_values [0]);
1034                         else
1035                                 UnmanagedType = (UnmanagedType) pos_values [0];
1036
1037                         object value = GetFieldValue ("SizeParamIndex");
1038                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
1039                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
1040                                 return null;
1041                         }
1042
1043                         object o = GetFieldValue ("ArraySubType");
1044                         UnmanagedType array_sub_type = o == null ? (UnmanagedType) 0x50 /* NATIVE_MAX */ : (UnmanagedType) o;
1045
1046                         switch (UnmanagedType) {
1047                         case UnmanagedType.CustomMarshaler: {
1048                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
1049                                         BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1050                                 if (define_custom == null) {
1051                                         Report.RuntimeMissingSupport (Location, "set marshal info");
1052                                         return null;
1053                                 }
1054
1055                                 object [] args = new object [4];
1056                                 args [0] = GetFieldValue ("MarshalTypeRef");
1057                                 args [1] = GetFieldValue ("MarshalCookie");
1058                                 args [2] = GetFieldValue ("MarshalType");
1059                                 args [3] = Guid.Empty;
1060                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
1061                         }
1062                         case UnmanagedType.LPArray: {
1063                                 object size_const = GetFieldValue ("SizeConst");
1064                                 object size_param_index = GetFieldValue ("SizeParamIndex");
1065
1066                                 if ((size_const != null) || (size_param_index != null)) {
1067                                         MethodInfo define_array = typeof (UnmanagedMarshal).GetMethod ("DefineLPArrayInternal",
1068                                                 BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1069                                         if (define_array == null) {
1070                                                 Report.RuntimeMissingSupport (Location, "set marshal info");
1071                                                 return null;
1072                                         }
1073
1074                                         object [] args = new object [3];
1075                                         args [0] = array_sub_type;
1076                                         args [1] = size_const == null ? -1 : size_const;
1077                                         args [2] = size_param_index == null ? -1 : size_param_index;
1078                                         return (UnmanagedMarshal) define_array.Invoke (null, args);
1079                                 }
1080                                 else
1081                                         return UnmanagedMarshal.DefineLPArray (array_sub_type);
1082                         }
1083                         case UnmanagedType.SafeArray:
1084                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
1085
1086                         case UnmanagedType.ByValArray:
1087                                 FieldBase fm = attr as FieldBase;
1088                                 if (fm == null) {
1089                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
1090                                         return null;
1091                                 }
1092                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
1093
1094                         case UnmanagedType.ByValTStr:
1095                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
1096
1097                         default:
1098                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
1099                         }
1100                 }
1101
1102                 object GetFieldValue (string name)
1103                 {
1104                         int i;
1105                         if (field_info_arr == null)
1106                                 return null;
1107                         i = 0;
1108                         foreach (FieldInfo fi in field_info_arr) {
1109                                 if (fi.Name == name)
1110                                         return GetValue (field_values_arr [i]);
1111                                 i++;
1112                         }
1113                         return null;
1114                 }
1115
1116                 static object GetValue (object value)
1117                 {
1118                         if (value is EnumConstant)
1119                                 return ((EnumConstant) value).GetValue ();
1120                         else
1121                                 return value;
1122                 }
1123
1124 #endif
1125
1126                 public CharSet GetCharSetValue ()
1127                 {
1128                         return (CharSet)System.Enum.Parse (typeof (CharSet), pos_values [0].ToString ());
1129                 }
1130
1131                 public bool HasField (string fieldName)
1132                 {
1133                         if (field_info_arr == null)
1134                                 return false;
1135
1136                         foreach (FieldInfo fi in field_info_arr) {
1137                                 if (fi.Name == fieldName)
1138                                         return true;
1139                         }
1140
1141                         return false;
1142                 }
1143
1144                 public bool IsInternalMethodImplAttribute {
1145                         get {
1146                                 if (Type != PredefinedAttributes.Get.MethodImpl)
1147                                         return false;
1148
1149                                 MethodImplOptions options;
1150                                 if (pos_values[0].GetType () != typeof (MethodImplOptions))
1151                                         options = (MethodImplOptions)System.Enum.ToObject (typeof (MethodImplOptions), pos_values[0]);
1152                                 else
1153                                         options = (MethodImplOptions)pos_values[0];
1154
1155                                 return (options & MethodImplOptions.InternalCall) != 0;
1156                         }
1157                 }
1158
1159                 public LayoutKind GetLayoutKindValue ()
1160                 {
1161                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (LayoutKind))
1162                                 return (LayoutKind)System.Enum.ToObject (typeof (LayoutKind), pos_values [0]);
1163
1164                         return (LayoutKind)pos_values [0];
1165                 }
1166
1167                 public object GetParameterDefaultValue ()
1168                 {
1169                         return pos_values [0];
1170                 }
1171
1172                 public override bool Equals (object obj)
1173                 {
1174                         Attribute a = obj as Attribute;
1175                         if (a == null)
1176                                 return false;
1177
1178                         return Type == a.Type && Target == a.Target;
1179                 }
1180
1181                 public override int GetHashCode ()
1182                 {
1183                         return base.GetHashCode ();
1184                 }
1185
1186                 /// <summary>
1187                 /// Emit attribute for Attributable symbol
1188                 /// </summary>
1189                 public void Emit (ListDictionary allEmitted)
1190                 {
1191                         CustomAttributeBuilder cb = Resolve ();
1192                         if (cb == null)
1193                                 return;
1194
1195                         AttributeUsageAttribute usage_attr = GetAttributeUsage (Type);
1196                         if ((usage_attr.ValidOn & Target) == 0) {
1197                                 Report.Error (592, Location, "The attribute `{0}' is not valid on this declaration type. " +
1198                                               "It is valid on `{1}' declarations only",
1199                                         GetSignatureForError (), GetValidTargets ());
1200                                 return;
1201                         }
1202
1203                         try {
1204                                 foreach (Attributable target in targets)
1205                                         target.ApplyAttributeBuilder (this, cb, PredefinedAttributes.Get);
1206                         } catch (Exception e) {
1207                                 Error_AttributeEmitError (e.Message);
1208                                 return;
1209                         }
1210
1211                         if (!usage_attr.AllowMultiple && allEmitted != null) {
1212                                 if (allEmitted.Contains (this)) {
1213                                         ArrayList a = allEmitted [this] as ArrayList;
1214                                         if (a == null) {
1215                                                 a = new ArrayList (2);
1216                                                 allEmitted [this] = a;
1217                                         }
1218                                         a.Add (this);
1219                                 } else {
1220                                         allEmitted.Add (this, null);
1221                                 }
1222                         }
1223
1224                         if (!RootContext.VerifyClsCompliance)
1225                                 return;
1226
1227                         // Here we are testing attribute arguments for array usage (error 3016)
1228                         if (Owner.IsClsComplianceRequired ()) {
1229                                 if (PosArguments != null)
1230                                         PosArguments.CheckArrayAsAttribute (context.Compiler);
1231
1232                                 if (NamedArguments == null)
1233                                         return;
1234
1235                                 NamedArguments.CheckArrayAsAttribute (context.Compiler);
1236                         }
1237                 }
1238
1239                 private Expression GetValue ()
1240                 {
1241                         if (PosArguments == null || PosArguments.Count < 1)
1242                                 return null;
1243
1244                         return PosArguments [0].Expr;
1245                 }
1246
1247                 public string GetString ()
1248                 {
1249                         Expression e = GetValue ();
1250                         if (e is StringConstant)
1251                                 return ((StringConstant)e).Value;
1252                         return null;
1253                 }
1254
1255                 public bool GetBoolean ()
1256                 {
1257                         Expression e = GetValue ();
1258                         if (e is BoolConstant)
1259                                 return ((BoolConstant)e).Value;
1260                         return false;
1261                 }
1262
1263                 public Type GetArgumentType ()
1264                 {
1265                         TypeOf e = GetValue () as TypeOf;
1266                         if (e == null)
1267                                 return null;
1268                         return e.TypeArgument;
1269                 }
1270
1271                 public override Expression CreateExpressionTree (ResolveContext ec)
1272                 {
1273                         throw new NotSupportedException ("ET");
1274                 }
1275
1276                 public override Expression DoResolve (ResolveContext ec)
1277                 {
1278                         throw new NotImplementedException ();
1279                 }
1280
1281                 public override void Emit (EmitContext ec)
1282                 {
1283                         throw new NotImplementedException ();
1284                 }
1285         }
1286
1287
1288         /// <summary>
1289         /// For global attributes (assembly, module) we need special handling.
1290         /// Attributes can be located in the several files
1291         /// </summary>
1292         public class GlobalAttribute : Attribute
1293         {
1294                 public readonly NamespaceEntry ns;
1295
1296                 public GlobalAttribute (NamespaceEntry ns, string target, ATypeNameExpression expression,
1297                                         Arguments[] args, Location loc, bool nameEscaped):
1298                         base (target, expression, args, loc, nameEscaped)
1299                 {
1300                         this.ns = ns;
1301                 }
1302
1303                 public override void AttachTo (Attributable target, IMemberContext context)
1304                 {
1305                         if (ExplicitTarget == "assembly") {
1306                                 base.AttachTo (CodeGen.Assembly, context);
1307                                 return;
1308                         }
1309
1310                         if (ExplicitTarget == "module") {
1311                                 base.AttachTo (RootContext.ToplevelTypes, context);
1312                                 return;
1313                         }
1314
1315                         throw new NotImplementedException ("Unknown global explicit target " + ExplicitTarget);
1316                 }
1317
1318                 void Enter ()
1319                 {
1320                         // RootContext.ToplevelTypes has a single NamespaceEntry which gets overwritten
1321                         // each time a new file is parsed.  However, we need to use the NamespaceEntry
1322                         // in effect where the attribute was used.  Since code elsewhere cannot assume
1323                         // that the NamespaceEntry is right, just overwrite it.
1324                         //
1325                         // Precondition: RootContext.ToplevelTypes == null
1326
1327                         if (RootContext.ToplevelTypes.NamespaceEntry != null)
1328                                 throw new InternalErrorException (Location + " non-null NamespaceEntry");
1329
1330                         RootContext.ToplevelTypes.NamespaceEntry = ns;
1331                 }
1332
1333                 protected override bool IsSecurityActionValid (bool for_assembly)
1334                 {
1335                         return base.IsSecurityActionValid (true);
1336                 }
1337
1338                 void Leave ()
1339                 {
1340                         RootContext.ToplevelTypes.NamespaceEntry = null;
1341                 }
1342
1343                 protected override TypeExpr ResolveAsTypeTerminal (Expression expr, IMemberContext ec)
1344                 {
1345                         try {
1346                                 Enter ();
1347                                 return base.ResolveAsTypeTerminal (expr, ec);
1348                         }
1349                         finally {
1350                                 Leave ();
1351                         }
1352                 }
1353
1354                 protected override ConstructorInfo ResolveConstructor (ResolveContext ec)
1355                 {
1356                         try {
1357                                 Enter ();
1358                                 return base.ResolveConstructor (ec);
1359                         }
1360                         finally {
1361                                 Leave ();
1362                         }
1363                 }
1364
1365                 protected override bool ResolveNamedArguments (ResolveContext ec)
1366                 {
1367                         try {
1368                                 Enter ();
1369                                 return base.ResolveNamedArguments (ec);
1370                         }
1371                         finally {
1372                                 Leave ();
1373                         }
1374                 }
1375         }
1376
1377         public class Attributes {
1378                 public readonly ArrayList Attrs;
1379
1380                 public Attributes (Attribute a)
1381                 {
1382                         Attrs = new ArrayList ();
1383                         Attrs.Add (a);
1384                 }
1385
1386                 public Attributes (ArrayList attrs)
1387                 {
1388                         Attrs = attrs;
1389                 }
1390
1391                 public void AddAttributes (ArrayList attrs)
1392                 {
1393                         Attrs.AddRange (attrs);
1394                 }
1395
1396                 public void AttachTo (Attributable attributable, IMemberContext context)
1397                 {
1398                         foreach (Attribute a in Attrs)
1399                                 a.AttachTo (attributable, context);
1400                 }
1401
1402                 public Attributes Clone ()
1403                 {
1404                         ArrayList al = new ArrayList (Attrs.Count);
1405                         foreach (Attribute a in Attrs)
1406                                 al.Add (a.Clone ());
1407
1408                         return new Attributes (al);
1409                 }
1410
1411                 /// <summary>
1412                 /// Checks whether attribute target is valid for the current element
1413                 /// </summary>
1414                 public bool CheckTargets ()
1415                 {
1416                         foreach (Attribute a in Attrs) {
1417                                 if (!a.CheckTarget ())
1418                                         return false;
1419                         }
1420                         return true;
1421                 }
1422
1423                 public Attribute Search (PredefinedAttribute t)
1424                 {
1425                         foreach (Attribute a in Attrs) {
1426                                 if (a.ResolveType () == t)
1427                                         return a;
1428                         }
1429                         return null;
1430                 }
1431
1432                 /// <summary>
1433                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1434                 /// </summary>
1435                 public Attribute[] SearchMulti (PredefinedAttribute t)
1436                 {
1437                         ArrayList ar = null;
1438
1439                         foreach (Attribute a in Attrs) {
1440                                 if (a.ResolveType () == t) {
1441                                         if (ar == null)
1442                                                 ar = new ArrayList ();
1443                                         ar.Add (a);
1444                                 }
1445                         }
1446
1447                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1448                 }
1449
1450                 public void Emit ()
1451                 {
1452                         CheckTargets ();
1453
1454                         ListDictionary ld = Attrs.Count > 1 ? new ListDictionary () : null;
1455
1456                         foreach (Attribute a in Attrs)
1457                                 a.Emit (ld);
1458
1459                         if (ld == null || ld.Count == 0)
1460                                 return;
1461
1462                         foreach (DictionaryEntry d in ld) {
1463                                 if (d.Value == null)
1464                                         continue;
1465
1466                                 Report report = RootContext.ToplevelTypes.Compiler.Report;
1467                                 foreach (Attribute collision in (ArrayList)d.Value)
1468                                         report.SymbolRelatedToPreviousError (collision.Location, "");
1469
1470                                 Attribute a = (Attribute)d.Key;
1471                                 report.Error (579, a.Location, "The attribute `{0}' cannot be applied multiple times",
1472                                         a.GetSignatureForError ());
1473                         }
1474                 }
1475
1476                 public bool Contains (PredefinedAttribute t)
1477                 {
1478                         return Search (t) != null;
1479                 }
1480         }
1481
1482         /// <summary>
1483         /// Helper class for attribute verification routine.
1484         /// </summary>
1485         sealed class AttributeTester
1486         {
1487                 static PtrHashtable analyzed_types;
1488                 static PtrHashtable analyzed_types_obsolete;
1489                 static PtrHashtable analyzed_member_obsolete;
1490                 static PtrHashtable analyzed_method_excluded;
1491                 static PtrHashtable fixed_buffer_cache;
1492
1493                 static object TRUE = new object ();
1494                 static object FALSE = new object ();
1495
1496                 static AttributeTester ()
1497                 {
1498                         Reset ();
1499                 }
1500
1501                 private AttributeTester ()
1502                 {
1503                 }
1504
1505                 public static void Reset ()
1506                 {
1507                         analyzed_types = new PtrHashtable ();
1508                         analyzed_types_obsolete = new PtrHashtable ();
1509                         analyzed_member_obsolete = new PtrHashtable ();
1510                         analyzed_method_excluded = new PtrHashtable ();
1511                         fixed_buffer_cache = new PtrHashtable ();
1512                 }
1513
1514                 public enum Result {
1515                         Ok,
1516                         RefOutArrayError,
1517                         ArrayArrayError
1518                 }
1519
1520                 /// <summary>
1521                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1522                 /// It tests differing only in ref or out, or in array rank.
1523                 /// </summary>
1524                 public static Result AreOverloadedMethodParamsClsCompliant (AParametersCollection pa, AParametersCollection pb)
1525                 {
1526                         Type [] types_a = pa.Types;
1527                         Type [] types_b = pb.Types;
1528                         if (types_a == null || types_b == null)
1529                                 return Result.Ok;
1530
1531                         if (types_a.Length != types_b.Length)
1532                                 return Result.Ok;
1533
1534                         Result result = Result.Ok;
1535                         for (int i = 0; i < types_b.Length; ++i) {
1536                                 Type aType = types_a [i];
1537                                 Type bType = types_b [i];
1538
1539                                 if (aType.IsArray && bType.IsArray) {
1540                                         Type a_el_type = TypeManager.GetElementType (aType);
1541                                         Type b_el_type = TypeManager.GetElementType (bType);
1542                                         if (aType.GetArrayRank () != bType.GetArrayRank () && a_el_type == b_el_type) {
1543                                                 result = Result.RefOutArrayError;
1544                                                 continue;
1545                                         }
1546
1547                                         if (a_el_type.IsArray || b_el_type.IsArray) {
1548                                                 result = Result.ArrayArrayError;
1549                                                 continue;
1550                                         }
1551                                 }
1552
1553                                 if (aType != bType)
1554                                         return Result.Ok;
1555
1556                                 const Parameter.Modifier out_ref_mod = (Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK);
1557                                 if ((pa.FixedParameters[i].ModFlags & out_ref_mod) != (pb.FixedParameters[i].ModFlags & out_ref_mod))
1558                                         result = Result.RefOutArrayError;
1559                         }
1560                         return result;
1561                 }
1562
1563                 /// <summary>
1564                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1565                 /// </summary>
1566                 public static bool IsClsCompliant (Type type)
1567                 {
1568                         if (type == null)
1569                                 return true;
1570
1571                         object type_compliance = analyzed_types[type];
1572                         if (type_compliance != null)
1573                                 return type_compliance == TRUE;
1574
1575                         if (type.IsPointer) {
1576                                 analyzed_types.Add (type, FALSE);
1577                                 return false;
1578                         }
1579
1580                         bool result;
1581                         if (type.IsArray) {
1582                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1583                         } else if (TypeManager.IsNullableType (type)) {
1584                                 result = IsClsCompliant (TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (type) [0]));
1585                         } else {
1586                                 result = AnalyzeTypeCompliance (type);
1587                         }
1588                         analyzed_types.Add (type, result ? TRUE : FALSE);
1589                         return result;
1590                 }
1591
1592                 /// <summary>
1593                 /// Returns IFixedBuffer implementation if field is fixed buffer else null.
1594                 /// </summary>
1595                 public static IFixedBuffer GetFixedBuffer (FieldInfo fi)
1596                 {
1597                         // Fixed buffer helper type is generated as value type
1598                         if (TypeManager.IsReferenceType (fi.FieldType))
1599                                 return null;
1600
1601                         FieldBase fb = TypeManager.GetField (fi);
1602                         if (fb != null) {
1603                                 return fb as IFixedBuffer;
1604                         }
1605
1606                         if (TypeManager.GetConstant (fi) != null)
1607                                 return null;
1608
1609                         object o = fixed_buffer_cache [fi];
1610                         if (o == null) {
1611                                 PredefinedAttribute pa = PredefinedAttributes.Get.FixedBuffer;
1612                                 if (!pa.IsDefined)
1613                                         return null;
1614
1615                                 if (!fi.IsDefined (pa.Type, false)) {
1616                                         fixed_buffer_cache.Add (fi, FALSE);
1617                                         return null;
1618                                 }
1619
1620                                 IFixedBuffer iff = new FixedFieldExternal (fi);
1621                                 fixed_buffer_cache.Add (fi, iff);
1622                                 return iff;
1623                         }
1624
1625                         if (o == FALSE)
1626                                 return null;
1627
1628                         return (IFixedBuffer)o;
1629                 }
1630
1631                 public static void VerifyModulesClsCompliance (CompilerContext ctx)
1632                 {
1633                         Module[] modules = GlobalRootNamespace.Instance.Modules;
1634                         if (modules == null)
1635                                 return;
1636
1637                         // The first module is generated assembly
1638                         for (int i = 1; i < modules.Length; ++i) {
1639                                 Module module = modules [i];
1640                                 if (!GetClsCompliantAttributeValue (module, null)) {
1641                                         ctx.Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute " +
1642                                                       "to match the assembly", module.Name);
1643                                         return;
1644                                 }
1645                         }
1646                 }
1647
1648                 public static Type GetImportedIgnoreCaseClsType (string name)
1649                 {
1650                         foreach (Assembly a in GlobalRootNamespace.Instance.Assemblies) {
1651                                 Type t = a.GetType (name, false, true);
1652                                 if (t == null)
1653                                         continue;
1654
1655                                 if (IsClsCompliant (t))
1656                                         return t;
1657                         }
1658                         return null;
1659                 }
1660
1661                 static bool GetClsCompliantAttributeValue (ICustomAttributeProvider attribute_provider, Assembly a)
1662                 {
1663                         PredefinedAttribute pa = PredefinedAttributes.Get.CLSCompliant;
1664                         if (!pa.IsDefined)
1665                                 return false;
1666
1667                         object[] cls_attr = attribute_provider.GetCustomAttributes (pa.Type, false);
1668                         if (cls_attr.Length == 0) {
1669                                 if (a == null)
1670                                         return false;
1671
1672                                 return GetClsCompliantAttributeValue (a, null);
1673                         }
1674
1675                         return ((CLSCompliantAttribute)cls_attr [0]).IsCompliant;
1676                 }
1677
1678                 static bool AnalyzeTypeCompliance (Type type)
1679                 {
1680                         type = TypeManager.DropGenericTypeArguments (type);
1681                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1682                         if (ds != null) {
1683                                 return ds.IsClsComplianceRequired ();
1684                         }
1685
1686                         if (TypeManager.IsGenericParameter (type))
1687                                 return true;
1688
1689                         return GetClsCompliantAttributeValue (type, type.Assembly);
1690                 }
1691
1692                 /// <summary>
1693                 /// Returns instance of ObsoleteAttribute when type is obsolete
1694                 /// </summary>
1695                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1696                 {
1697                         object type_obsolete = analyzed_types_obsolete [type];
1698                         if (type_obsolete == FALSE)
1699                                 return null;
1700
1701                         if (type_obsolete != null)
1702                                 return (ObsoleteAttribute)type_obsolete;
1703
1704                         ObsoleteAttribute result = null;
1705                         if (TypeManager.HasElementType (type)) {
1706                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1707                         } else if (TypeManager.IsGenericParameter (type))
1708                                 result = null;  // TODO: throw new NotSupportedException ()
1709                         else if (TypeManager.IsGenericType (type) && !TypeManager.IsGenericTypeDefinition (type)) {
1710                                 return GetObsoleteAttribute (TypeManager.DropGenericTypeArguments (type));
1711                         } else {
1712                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1713
1714                                 // Type is external, we can get attribute directly
1715                                 if (type_ds == null) {
1716                                         PredefinedAttribute pa = PredefinedAttributes.Get.Obsolete;
1717                                         if (pa.IsDefined) {
1718                                                 object[] attribute = type.GetCustomAttributes (pa.Type, false);
1719                                                 if (attribute.Length == 1)
1720                                                         result = (ObsoleteAttribute) attribute[0];
1721                                         }
1722                                 } else {
1723                                         result = type_ds.GetObsoleteAttribute ();
1724                                 }
1725                         }
1726
1727                         // Cannot use .Add because of corlib bootstrap
1728                         analyzed_types_obsolete [type] = result == null ? FALSE : result;
1729                         return result;
1730                 }
1731
1732                 /// <summary>
1733                 /// Returns instance of ObsoleteAttribute when method is obsolete
1734                 /// </summary>
1735                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1736                 {
1737                         IMethodData mc = TypeManager.GetMethod (mb);
1738                         if (mc != null)
1739                                 return mc.GetObsoleteAttribute ();
1740
1741                         // compiler generated methods are not registered by AddMethod
1742                         if (mb.DeclaringType is TypeBuilder)
1743                                 return null;
1744
1745                         MemberInfo mi = TypeManager.GetPropertyFromAccessor (mb);
1746                         if (mi != null)
1747                                 return GetMemberObsoleteAttribute (mi);
1748
1749                         mi = TypeManager.GetEventFromAccessor (mb);
1750                         if (mi != null)
1751                                 return GetMemberObsoleteAttribute (mi);
1752
1753                         return GetMemberObsoleteAttribute (mb);
1754                 }
1755
1756                 /// <summary>
1757                 /// Returns instance of ObsoleteAttribute when member is obsolete
1758                 /// </summary>
1759                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1760                 {
1761                         object type_obsolete = analyzed_member_obsolete [mi];
1762                         if (type_obsolete == FALSE)
1763                                 return null;
1764
1765                         if (type_obsolete != null)
1766                                 return (ObsoleteAttribute)type_obsolete;
1767
1768                         if ((mi.DeclaringType is TypeBuilder) || TypeManager.IsGenericType (mi.DeclaringType))
1769                                 return null;
1770
1771                         PredefinedAttribute pa = PredefinedAttributes.Get.Obsolete;
1772                         if (!pa.IsDefined)
1773                                 return null;
1774
1775                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, pa.Type, false)
1776                                 as ObsoleteAttribute;
1777                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1778                         return oa;
1779                 }
1780
1781                 /// <summary>
1782                 /// Common method for Obsolete error/warning reporting.
1783                 /// </summary>
1784                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc, Report Report)
1785                 {
1786                         if (oa.IsError) {
1787                                 Report.Error (619, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1788                                 return;
1789                         }
1790
1791                         if (oa.Message == null || oa.Message.Length == 0) {
1792                                 Report.Warning (612, 1, loc, "`{0}' is obsolete", member);
1793                                 return;
1794                         }
1795                         Report.Warning (618, 2, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1796                 }
1797
1798                 public static bool IsConditionalMethodExcluded (MethodBase mb, Location loc)
1799                 {
1800                         object excluded = analyzed_method_excluded [mb];
1801                         if (excluded != null)
1802                                 return excluded == TRUE ? true : false;
1803
1804                         PredefinedAttribute pa = PredefinedAttributes.Get.Conditional;
1805                         if (!pa.IsDefined)
1806                                 return false;
1807
1808                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (pa.Type, true)
1809                                 as ConditionalAttribute[];
1810                         if (attrs.Length == 0) {
1811                                 analyzed_method_excluded.Add (mb, FALSE);
1812                                 return false;
1813                         }
1814
1815                         foreach (ConditionalAttribute a in attrs) {
1816                                 if (loc.CompilationUnit.IsConditionalDefined (a.ConditionString)) {
1817                                         analyzed_method_excluded.Add (mb, FALSE);
1818                                         return false;
1819                                 }
1820                         }
1821
1822                         analyzed_method_excluded.Add (mb, TRUE);
1823                         return true;
1824                 }
1825
1826                 /// <summary>
1827                 /// Analyzes class whether it has attribute which has ConditionalAttribute
1828                 /// and its condition is not defined.
1829                 /// </summary>
1830                 public static bool IsAttributeExcluded (Type type, Location loc)
1831                 {
1832                         if (!type.IsClass)
1833                                 return false;
1834
1835                         Class class_decl = TypeManager.LookupDeclSpace (type) as Class;
1836
1837                         // TODO: add caching
1838                         // TODO: merge all Type bases attribute caching to one cache to save memory
1839                         PredefinedAttribute pa = PredefinedAttributes.Get.Conditional;
1840                         if (class_decl == null && pa.IsDefined) {
1841                                 object[] attributes = type.GetCustomAttributes (pa.Type, false);
1842                                 foreach (ConditionalAttribute ca in attributes) {
1843                                         if (loc.CompilationUnit.IsConditionalDefined (ca.ConditionString))
1844                                                 return false;
1845                                 }
1846                                 return attributes.Length > 0;
1847                         }
1848
1849                         return class_decl.IsExcluded ();
1850                 }
1851
1852                 public static Type GetCoClassAttribute (Type type)
1853                 {
1854                         TypeContainer tc = TypeManager.LookupInterface (type);
1855                         PredefinedAttribute pa = PredefinedAttributes.Get.CoClass;
1856                         if (tc == null) {
1857                                 if (!pa.IsDefined)
1858                                         return null;
1859
1860                                 object[] o = type.GetCustomAttributes (pa.Type, false);
1861                                 if (o.Length < 1)
1862                                         return null;
1863                                 return ((System.Runtime.InteropServices.CoClassAttribute)o[0]).CoClass;
1864                         }
1865
1866                         if (tc.OptAttributes == null)
1867                                 return null;
1868
1869                         Attribute a = tc.OptAttributes.Search (pa);
1870                         if (a == null)
1871                                 return null;
1872
1873                         return a.GetCoClassAttributeValue ();
1874                 }
1875         }
1876
1877         public class PredefinedAttributes
1878         {
1879                 // Core types
1880                 public readonly PredefinedAttribute ParamArray;
1881                 public readonly PredefinedAttribute Out;
1882
1883                 // Optional types
1884                 public readonly PredefinedAttribute Obsolete;
1885                 public readonly PredefinedAttribute DllImport;
1886                 public readonly PredefinedAttribute MethodImpl;
1887                 public readonly PredefinedAttribute MarshalAs;
1888                 public readonly PredefinedAttribute In;
1889                 public readonly PredefinedAttribute IndexerName;
1890                 public readonly PredefinedAttribute Conditional;
1891                 public readonly PredefinedAttribute CLSCompliant;
1892                 public readonly PredefinedAttribute Security;
1893                 public readonly PredefinedAttribute Required;
1894                 public readonly PredefinedAttribute Guid;
1895                 public readonly PredefinedAttribute AssemblyCulture;
1896                 public readonly PredefinedAttribute AssemblyVersion;
1897                 public readonly PredefinedAttribute ComImport;
1898                 public readonly PredefinedAttribute CoClass;
1899                 public readonly PredefinedAttribute AttributeUsage;
1900                 public readonly PredefinedAttribute DefaultParameterValue;
1901                 public readonly PredefinedAttribute OptionalParameter;
1902
1903                 // New in .NET 2.0
1904                 public readonly PredefinedAttribute DefaultCharset;
1905                 public readonly PredefinedAttribute TypeForwarder;
1906                 public readonly PredefinedAttribute FixedBuffer;
1907                 public readonly PredefinedAttribute CompilerGenerated;
1908                 public readonly PredefinedAttribute InternalsVisibleTo;
1909                 public readonly PredefinedAttribute RuntimeCompatibility;
1910                 public readonly PredefinedAttribute DebuggerHidden;
1911                 public readonly PredefinedAttribute UnsafeValueType;
1912
1913                 // New in .NET 3.5
1914                 public readonly PredefinedAttribute Extension;
1915
1916                 // New in .NET 4.0
1917                 public readonly PredefinedAttribute Dynamic;
1918
1919                 //
1920                 // Optional types which are used as types and for member lookup
1921                 //
1922                 public readonly PredefinedAttribute DefaultMember;
1923                 public readonly PredefinedAttribute DecimalConstant;
1924                 public readonly PredefinedAttribute StructLayout;
1925                 public readonly PredefinedAttribute FieldOffset;
1926
1927                 public static PredefinedAttributes Get = new PredefinedAttributes ();
1928
1929                 private PredefinedAttributes ()
1930                 {
1931                         ParamArray = new PredefinedAttribute ("System", "ParamArrayAttribute");
1932                         Out = new PredefinedAttribute ("System.Runtime.InteropServices", "OutAttribute");
1933
1934                         Obsolete = new PredefinedAttribute ("System", "ObsoleteAttribute");
1935                         DllImport = new PredefinedAttribute ("System.Runtime.InteropServices", "DllImportAttribute");
1936                         MethodImpl = new PredefinedAttribute ("System.Runtime.CompilerServices", "MethodImplAttribute");
1937                         MarshalAs = new PredefinedAttribute ("System.Runtime.InteropServices", "MarshalAsAttribute");
1938                         In = new PredefinedAttribute ("System.Runtime.InteropServices", "InAttribute");
1939                         IndexerName = new PredefinedAttribute ("System.Runtime.CompilerServices", "IndexerNameAttribute");
1940                         Conditional = new PredefinedAttribute ("System.Diagnostics", "ConditionalAttribute");
1941                         CLSCompliant = new PredefinedAttribute ("System", "CLSCompliantAttribute");
1942                         Security = new PredefinedAttribute ("System.Security.Permissions", "SecurityAttribute");
1943                         Required = new PredefinedAttribute ("System.Runtime.CompilerServices", "RequiredAttributeAttribute");
1944                         Guid = new PredefinedAttribute ("System.Runtime.InteropServices", "GuidAttribute");
1945                         AssemblyCulture = new PredefinedAttribute ("System.Reflection", "AssemblyCultureAttribute");
1946                         AssemblyVersion = new PredefinedAttribute ("System.Reflection", "AssemblyVersionAttribute");
1947                         ComImport = new PredefinedAttribute ("System.Runtime.InteropServices", "ComImportAttribute");
1948                         CoClass = new PredefinedAttribute ("System.Runtime.InteropServices", "CoClassAttribute");
1949                         AttributeUsage = new PredefinedAttribute ("System", "AttributeUsageAttribute");
1950                         DefaultParameterValue = new PredefinedAttribute ("System.Runtime.InteropServices", "DefaultParameterValueAttribute");
1951                         OptionalParameter = new PredefinedAttribute ("System.Runtime.InteropServices", "OptionalAttribute");
1952
1953                         DefaultCharset = new PredefinedAttribute ("System.Runtime.InteropServices", "DefaultCharSetAttribute");
1954                         TypeForwarder = new PredefinedAttribute ("System.Runtime.CompilerServices", "TypeForwardedToAttribute");
1955                         FixedBuffer = new PredefinedAttribute ("System.Runtime.CompilerServices", "FixedBufferAttribute");
1956                         CompilerGenerated = new PredefinedAttribute ("System.Runtime.CompilerServices", "CompilerGeneratedAttribute");
1957                         InternalsVisibleTo = new PredefinedAttribute ("System.Runtime.CompilerServices", "InternalsVisibleToAttribute");
1958                         RuntimeCompatibility = new PredefinedAttribute ("System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1959                         DebuggerHidden = new PredefinedAttribute ("System.Diagnostics", "DebuggerHiddenAttribute");
1960                         UnsafeValueType = new PredefinedAttribute ("System.Runtime.CompilerServices", "UnsafeValueTypeAttribute");
1961
1962                         Extension = new PredefinedAttribute ("System.Runtime.CompilerServices", "ExtensionAttribute");
1963
1964                         Dynamic = new PredefinedAttribute ("System.Runtime.CompilerServices", "DynamicAttribute");
1965
1966                         DefaultMember = new PredefinedAttribute ("System.Reflection", "DefaultMemberAttribute");
1967                         DecimalConstant = new PredefinedAttribute ("System.Runtime.CompilerServices", "DecimalConstantAttribute");
1968                         StructLayout = new PredefinedAttribute ("System.Runtime.InteropServices", "StructLayoutAttribute");
1969                         FieldOffset = new PredefinedAttribute ("System.Runtime.InteropServices", "FieldOffsetAttribute");
1970                 }
1971
1972                 public void Initialize ()
1973                 {
1974                         foreach (FieldInfo fi in GetType ().GetFields (BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly)) {
1975                                 ((PredefinedAttribute) fi.GetValue (this)).Resolve (true);
1976                         }
1977                 }
1978
1979                 public static void Reset ()
1980                 {
1981                         Get = new PredefinedAttributes ();
1982                 }
1983         }
1984
1985         public class PredefinedAttribute
1986         {
1987                 Type type;
1988                 CustomAttributeBuilder cab;
1989                 ConstructorInfo ctor;
1990                 readonly string ns, name;
1991
1992                 public PredefinedAttribute (string ns, string name)
1993                 {
1994                         this.ns = ns;
1995                         this.name = name;
1996                 }
1997
1998                 public static bool operator == (Type type, PredefinedAttribute pa)
1999                 {
2000                         return type == pa.type;
2001                 }
2002
2003                 public static bool operator != (Type type, PredefinedAttribute pa)
2004                 {
2005                         return type != pa.type;
2006                 }
2007
2008                 public ConstructorInfo Constructor {
2009                         get { return ctor; }
2010                 }
2011
2012                 public override int GetHashCode ()
2013                 {
2014                         return base.GetHashCode ();
2015                 }
2016
2017                 public override bool Equals (object obj)
2018                 {
2019                         throw new NotSupportedException ();
2020                 }
2021
2022                 public void EmitAttribute (ConstructorBuilder builder)
2023                 {
2024                         if (ResolveBuilder ())
2025                                 builder.SetCustomAttribute (cab);
2026                 }
2027
2028                 public void EmitAttribute (MethodBuilder builder)
2029                 {
2030                         if (ResolveBuilder ())
2031                                 builder.SetCustomAttribute (cab);
2032                 }
2033
2034                 public void EmitAttribute (PropertyBuilder builder)
2035                 {
2036                         if (ResolveBuilder ())
2037                                 builder.SetCustomAttribute (cab);
2038                 }
2039
2040                 public void EmitAttribute (FieldBuilder builder)
2041                 {
2042                         if (ResolveBuilder ())
2043                                 builder.SetCustomAttribute (cab);
2044                 }
2045
2046                 public void EmitAttribute (TypeBuilder builder)
2047                 {
2048                         if (ResolveBuilder ())
2049                                 builder.SetCustomAttribute (cab);
2050                 }
2051
2052                 public void EmitAttribute (AssemblyBuilder builder)
2053                 {
2054                         if (ResolveBuilder ())
2055                                 builder.SetCustomAttribute (cab);
2056                 }
2057
2058                 public void EmitAttribute (ParameterBuilder builder, Location loc)
2059                 {
2060                         if (ResolveBuilder ())
2061                                 builder.SetCustomAttribute (cab);
2062                 }
2063
2064                 public bool IsDefined {
2065                         get { return type != null && type != typeof (PredefinedAttribute); }
2066                 }
2067
2068                 public bool Resolve (bool canFail)
2069                 {
2070                         if (type != null) {
2071                                 if (IsDefined)
2072                                         return true;
2073                                 if (canFail)
2074                                         return false;
2075                         }
2076
2077                         type = TypeManager.CoreLookupType (RootContext.ToplevelTypes.Compiler, ns, name, Kind.Class, !canFail);
2078                         if (type == null) {
2079                                 type = typeof (PredefinedAttribute);
2080                                 return false;
2081                         }
2082
2083                         return true;
2084                 }
2085
2086                 bool ResolveBuilder ()
2087                 {
2088                         if (cab != null)
2089                                 return true;
2090
2091                         //
2092                         // Handle all parameter-less attributes as optional
2093                         //
2094                         if (!Resolve (true))
2095                                 return false;
2096
2097                         ConstructorInfo ci = TypeManager.GetPredefinedConstructor (type, Location.Null, Type.EmptyTypes);
2098                         if (ci == null)
2099                                 return false;
2100
2101                         cab = new CustomAttributeBuilder (ci, new object[0]);
2102                         return true;
2103                 }
2104
2105                 public bool ResolveConstructor (Location loc, params Type[] argType)
2106                 {
2107                         if (ctor != null)
2108                                 throw new InternalErrorException ("Predefined ctor redefined");
2109
2110                         if (!Resolve (false))
2111                                 return false;
2112
2113                         ctor = TypeManager.GetPredefinedConstructor (type, loc, argType);
2114                         return ctor != null;
2115                 }
2116
2117                 public Type Type {
2118                         get { return type; }
2119                 }
2120         }
2121 }