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                 public void Error_MisusedDynamicAttribute ()
 206                 {
 207                         Report.Error (1970, loc, "Do not use `{0}' directly. Use `dynamic' keyword instead", GetSignatureForError ());
 208                 }
 209
 210                 /// <summary>
 211                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 212                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 213                 /// </summary>
 214                 public void Error_AttributeEmitError (string inner)
 215                 {
 216                         Report.Error (647, Location, "Error during emitting `{0}' attribute. The reason is `{1}'",
 217                                       TypeManager.CSharpName (Type), inner);
 218                 }
 219
 220                 public void Error_InvalidSecurityParent ()
 221                 {
 222                         Error_AttributeEmitError ("it is attached to invalid parent");
 223                 }
 224
 225                 Attributable Owner {
 226                         get {
 227                                 return targets [0];
 228                         }
 229                 }
 230
 231                 protected virtual TypeExpr ResolveAsTypeTerminal (Expression expr, IMemberContext ec)
 232                 {
 233                         return expr.ResolveAsTypeTerminal (ec, false);
 234                 }
 235
 236                 Type ResolvePossibleAttributeType (ATypeNameExpression expr, ref bool is_attr)
 237                 {
 238                         TypeExpr te = ResolveAsTypeTerminal (expr, context);
 239                         if (te == null)
 240                                 return null;
 241
 242                         Type t = te.Type;
 243                         if (TypeManager.IsSubclassOf (t, TypeManager.attribute_type)) {
 244                                 is_attr = true;
 245                         } else {
 246                                 Report.SymbolRelatedToPreviousError (t);
 247                                 Report.Error (616, Location, "`{0}': is not an attribute class", TypeManager.CSharpName (t));
 248                         }
 249                         return t;
 250                 }
 251
 252                 /// <summary>
 253                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 254                 /// </summary>
 255                 void ResolveAttributeType ()
 256                 {
 257                         SessionReportPrinter resolve_printer = new SessionReportPrinter ();
 258                         ReportPrinter prev_recorder = context.Compiler.Report.SetPrinter (resolve_printer);
 259
 260                         bool t1_is_attr = false;
 261                         bool t2_is_attr = false;
 262                         Type t1, t2;
 263                         ATypeNameExpression expanded = null;
 264
 265                         try {
 266                                 t1 = ResolvePossibleAttributeType (expression, ref t1_is_attr);
 267
 268                                 if (nameEscaped) {
 269                                         t2 = null;
 270                                 } else {
 271                                         expanded = (ATypeNameExpression) expression.Clone (null);
 272                                         expanded.Name += "Attribute";
 273
 274                                         t2 = ResolvePossibleAttributeType (expanded, ref t2_is_attr);
 275                                 }
 276
 277                                 resolve_printer.EndSession ();
 278                         } finally {
 279                                 context.Compiler.Report.SetPrinter (prev_recorder);
 280                         }
 281
 282                         if (t1_is_attr && t2_is_attr) {
 283                                 Report.Error (1614, Location, "`{0}' is ambiguous between `{1}' and `{2}'. Use either `@{0}' or `{0}Attribute'",
 284                                         GetSignatureForError (), expression.GetSignatureForError (), expanded.GetSignatureForError ());
 285                                 resolve_error = true;
 286                                 return;
 287                         }
 288
 289                         if (t1_is_attr) {
 290                                 Type = t1;
 291                                 return;
 292                         }
 293
 294                         if (t2_is_attr) {
 295                                 Type = t2;
 296                                 return;
 297                         }
 298
 299                         resolve_printer.Merge (prev_recorder);
 300                         resolve_error = true;
 301                 }
 302
 303                 public virtual Type ResolveType ()
 304                 {
 305                         if (Type == null && !resolve_error)
 306                                 ResolveAttributeType ();
 307                         return Type;
 308                 }
 309
 310                 public override string GetSignatureForError ()
 311                 {
 312                         if (Type != null)
 313                                 return TypeManager.CSharpName (Type);
 314
 315                         return expression.GetSignatureForError ();
 316                 }
 317
 318                 public bool HasSecurityAttribute {
 319                         get {
 320                                 PredefinedAttribute pa = PredefinedAttributes.Get.Security;
 321                                 return pa.IsDefined && TypeManager.IsSubclassOf (type, pa.Type);
 322                         }
 323                 }
 324
 325                 public bool IsValidSecurityAttribute ()
 326                 {
 327                         return HasSecurityAttribute && IsSecurityActionValid (false);
 328                 }
 329
 330                 static bool IsValidArgumentType (Type t)
 331                 {
 332                         if (t.IsArray)
 333                                 t = TypeManager.GetElementType (t);
 334
 335                         return t == TypeManager.string_type ||
 336                                 TypeManager.IsPrimitiveType (t) ||
 337                                 TypeManager.IsEnumType (t) ||
 338                                 t == TypeManager.object_type ||
 339                                 t == TypeManager.type_type;
 340                 }
 341
 342                 // TODO: Don't use this ambiguous value
 343                 public string Name {
 344                         get { return expression.Name; }
 345                 }
 346
 347                 void ApplyModuleCharSet (ResolveContext rc)
 348                 {
 349                         if (Type != PredefinedAttributes.Get.DllImport)
 350                                 return;
 351
 352                         if (!RootContext.ToplevelTypes.HasDefaultCharSet)
 353                                 return;
 354
 355                         const string CharSetEnumMember = "CharSet";
 356                         if (NamedArguments == null) {
 357                                 NamedArguments = new Arguments (1);
 358                         } else {
 359                                 foreach (NamedArgument a in NamedArguments) {
 360                                         if (a.Name.Value == CharSetEnumMember)
 361                                                 return;
 362                                 }
 363                         }
 364
 365                         NamedArguments.Add (new NamedArgument (new LocatedToken (loc, CharSetEnumMember),
 366                                 Constant.CreateConstant (rc, typeof (CharSet), RootContext.ToplevelTypes.DefaultCharSet, Location)));
 367                 }
 368
 369                 public Report Report {
 370                         get { return context.Compiler.Report; }
 371                 }
 372
 373                 public CustomAttributeBuilder Resolve ()
 374                 {
 375                         if (resolve_error)
 376                                 return null;
 377
 378                         resolve_error = true;
 379
 380                         if (Type == null) {
 381                                 ResolveAttributeType ();
 382                                 if (Type == null)
 383                                         return null;
 384                         }
 385
 386                         if (Type.IsAbstract) {
 387                                 Report.Error (653, Location, "Cannot apply attribute class `{0}' because it is abstract", GetSignatureForError ());
 388                                 return null;
 389                         }
 390
 391                         ObsoleteAttribute obsolete_attr = AttributeTester.GetObsoleteAttribute (Type);
 392                         if (obsolete_attr != null) {
 393                                 AttributeTester.Report_ObsoleteMessage (obsolete_attr, TypeManager.CSharpName (Type), Location, Report);
 394                         }
 395
 396                         if (PosArguments == null && NamedArguments == null) {
 397                                 object o = att_cache [Type];
 398                                 if (o != null) {
 399                                         resolve_error = false;
 400                                         return (CustomAttributeBuilder)o;
 401                                 }
 402                         }
 403
 404                         ResolveContext rc = new ResolveContext (context, ResolveContext.Options.ConstantScope);
 405                         ConstructorInfo ctor = ResolveConstructor (rc);
 406                         if (ctor == null) {
 407                                 if (Type is TypeBuilder &&
 408                                     TypeManager.LookupDeclSpace (Type).MemberCache == null)
 409                                         // The attribute type has been DefineType'd, but not Defined.  Let's not treat it as an error.
 410                                         // It'll be resolved again when the attached-to entity is emitted.
 411                                         resolve_error = false;
 412                                 return null;
 413                         }
 414
 415                         ApplyModuleCharSet (rc);
 416
 417                         CustomAttributeBuilder cb;
 418                         try {
 419                                 // SRE does not allow private ctor but we want to report all source code errors
 420                                 if (ctor.IsPrivate)
 421                                         return null;
 422
 423                                 if (NamedArguments == null) {
 424                                         cb = new CustomAttributeBuilder (ctor, pos_values);
 425
 426                                         if (pos_values.Length == 0)
 427                                                 att_cache.Add (Type, cb);
 428
 429                                         resolve_error = false;
 430                                         return cb;
 431                                 }
 432
 433                                 if (!ResolveNamedArguments (rc)) {
 434                                         return null;
 435                                 }
 436
 437                                 cb = new CustomAttributeBuilder (ctor, pos_values,
 438                                                 prop_info_arr, prop_values_arr,
 439                                                 field_info_arr, field_values_arr);
 440
 441                                 resolve_error = false;
 442                                 return cb;
 443                         }
 444                         catch (Exception) {
 445                                 Error_AttributeArgumentNotValid (rc, Location);
 446                                 return null;
 447                         }
 448                 }
 449
 450                 protected virtual ConstructorInfo ResolveConstructor (ResolveContext ec)
 451                 {
 452                         if (PosArguments != null) {
 453                                 bool dynamic;
 454                                 PosArguments.Resolve (ec, out dynamic);
 455                                 if (dynamic) {
 456                                         Error_AttributeArgumentNotValid (ec, loc);
 457                                         return null;
 458                                 }
 459                         }
 460
 461                         MethodGroupExpr mg = MemberLookupFinal (ec, ec.CurrentType,
 462                                 Type, ConstructorInfo.ConstructorName, MemberTypes.Constructor,
 463                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 464                                 Location) as MethodGroupExpr;
 465
 466                         if (mg == null)
 467                                 throw new NotImplementedException ();
 468
 469                         mg = mg.OverloadResolve (ec, ref PosArguments, false, Location);
 470                         if (mg == null)
 471                                 return null;
 472
 473                         ConstructorInfo constructor = (ConstructorInfo)mg;
 474                         if (PosArguments == null) {
 475                                 pos_values = EmptyObject;
 476                                 return constructor;
 477                         }
 478
 479                         AParametersCollection pd = TypeManager.GetParameterData (constructor);
 480
 481                         if (!PosArguments.GetAttributableValue (ec, out pos_values))
 482                                 return null;
 483
 484                         // Here we do the checks which should be done by corlib or by runtime.
 485                         // However Zoltan doesn't like it and every Mono compiler has to do it again.
 486                         PredefinedAttributes pa = PredefinedAttributes.Get;
 487                         if (Type == pa.Guid) {
 488                                 try {
 489                                         new Guid ((string)pos_values [0]);
 490                                 }
 491                                 catch (Exception e) {
 492                                         Error_AttributeEmitError (e.Message);
 493                                         return null;
 494                                 }
 495                         }
 496
 497                         if (Type == pa.AttributeUsage && (int)pos_values [0] == 0) {
 498                                 ec.Report.Error (591, Location, "Invalid value for argument to `System.AttributeUsage' attribute");
 499                                 return null;
 500                         }
 501
 502                         if (Type == pa.IndexerName || Type == pa.Conditional) {
 503                                 string v = pos_values [0] as string;
 504                                 if (!Tokenizer.IsValidIdentifier (v) || Tokenizer.IsKeyword (v)) {
 505                                         ec.Report.Error (633, PosArguments [0].Expr.Location,
 506                                                 "The argument to the `{0}' attribute must be a valid identifier", GetSignatureForError ());
 507                                         return null;
 508                                 }
 509                         }
 510
 511                         if (Type == pa.MethodImpl && pos_values.Length == 1 &&
 512                                 pd.Types [0] == TypeManager.short_type &&
 513                                 !System.Enum.IsDefined (typeof (MethodImplOptions), pos_values [0].ToString ())) {
 514                                 Error_AttributeEmitError ("Incorrect argument value.");
 515                                 return null;
 516                         }
 517
 518                         return constructor;
 519                 }
 520
 521                 protected virtual bool ResolveNamedArguments (ResolveContext ec)
 522                 {
 523                         int named_arg_count = NamedArguments.Count;
 524
 525                         ArrayList field_infos = new ArrayList (named_arg_count);
 526                         ArrayList prop_infos  = new ArrayList (named_arg_count);
 527                         ArrayList field_values = new ArrayList (named_arg_count);
 528                         ArrayList prop_values = new ArrayList (named_arg_count);
 529
 530                         ArrayList seen_names = new ArrayList (named_arg_count);
 531
 532                         foreach (NamedArgument a in NamedArguments) {
 533                                 string name = a.Name.Value;
 534                                 if (seen_names.Contains (name)) {
 535                                         ec.Report.Error (643, a.Name.Location, "Duplicate named attribute `{0}' argument", name);
 536                                         continue;
 537                                 }
 538
 539                                 seen_names.Add (name);
 540
 541                                 a.Resolve (ec);
 542
 543                                 Expression member = Expression.MemberLookup (ec.Compiler,
 544                                         ec.CurrentType, Type, name,
 545                                         MemberTypes.All,
 546                                         BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static,
 547                                         Location);
 548
 549                                 if (member == null) {
 550                                         member = Expression.MemberLookup (ec.Compiler, ec.CurrentType, Type, name,
 551                                                 MemberTypes.All, BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static,
 552                                                 Location);
 553
 554                                         if (member != null) {
 555                                                 ec.Report.SymbolRelatedToPreviousError (member.Type);
 556                                                 Expression.ErrorIsInaccesible (Location, member.GetSignatureForError (), ec.Report);
 557                                                 return false;
 558                                         }
 559                                 }
 560
 561                                 if (member == null){
 562                                         Expression.Error_TypeDoesNotContainDefinition (ec, Location, Type, name);
 563                                         return false;
 564                                 }
 565
 566                                 if (!(member is PropertyExpr || member is FieldExpr)) {
 567                                         Error_InvalidNamedArgument (ec, a);
 568                                         return false;
 569                                 }
 570
 571                                 ObsoleteAttribute obsolete_attr;
 572
 573                                 if (member is PropertyExpr) {
 574                                         PropertyInfo pi = ((PropertyExpr) member).PropertyInfo;
 575
 576                                         if (!pi.CanWrite || !pi.CanRead || pi.GetGetMethod ().IsStatic) {
 577                                                 ec.Report.SymbolRelatedToPreviousError (pi);
 578                                                 Error_InvalidNamedArgument (ec, a);
 579                                                 return false;
 580                                         }
 581
 582                                         if (!IsValidArgumentType (member.Type)) {
 583                                                 ec.Report.SymbolRelatedToPreviousError (pi);
 584                                                 Error_InvalidNamedArgumentType (ec, a);
 585                                                 return false;
 586                                         }
 587
 588                                         object value;
 589                                         if (!a.Expr.GetAttributableValue (ec, member.Type, out value))
 590                                                 return false;
 591
 592                                         PropertyBase pb = TypeManager.GetProperty (pi);
 593                                         if (pb != null)
 594                                                 obsolete_attr = pb.GetObsoleteAttribute ();
 595                                         else
 596                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (pi);
 597
 598                                         prop_values.Add (value);
 599                                         prop_infos.Add (pi);
 600
 601                                 } else {
 602                                         FieldInfo fi = ((FieldExpr) member).FieldInfo;
 603
 604                                         if (fi.IsInitOnly || fi.IsStatic) {
 605                                                 Error_InvalidNamedArgument (ec, a);
 606                                                 return false;
 607                                         }
 608
 609                                         if (!IsValidArgumentType (member.Type)) {
 610                                                 ec.Report.SymbolRelatedToPreviousError (fi);
 611                                                 Error_InvalidNamedArgumentType (ec, a);
 612                                                 return false;
 613                                         }
 614
 615                                         object value;
 616                                         if (!a.Expr.GetAttributableValue (ec, member.Type, out value))
 617                                                 return false;
 618
 619                                         FieldBase fb = TypeManager.GetField (fi);
 620                                         if (fb != null)
 621                                                 obsolete_attr = fb.GetObsoleteAttribute ();
 622                                         else
 623                                                 obsolete_attr = AttributeTester.GetMemberObsoleteAttribute (fi);
 624
 625                                         field_values.Add (value);
 626                                         field_infos.Add (fi);
 627                                 }
 628
 629                                 if (obsolete_attr != null && !context.IsObsolete)
 630                                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, member.GetSignatureForError (), member.Location, Report);
 631                         }
 632
 633                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 634                         field_info_arr = new FieldInfo [field_infos.Count];
 635                         field_values_arr = new object [field_values.Count];
 636                         prop_values_arr = new object [prop_values.Count];
 637
 638                         field_infos.CopyTo  (field_info_arr, 0);
 639                         field_values.CopyTo (field_values_arr, 0);
 640
 641                         prop_values.CopyTo  (prop_values_arr, 0);
 642                         prop_infos.CopyTo   (prop_info_arr, 0);
 643
 644                         return true;
 645                 }
 646
 647                 /// <summary>
 648                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 649                 /// </summary>
 650                 public string GetValidTargets ()
 651                 {
 652                         StringBuilder sb = new StringBuilder ();
 653                         AttributeTargets targets = GetAttributeUsage (Type).ValidOn;
 654
 655                         if ((targets & AttributeTargets.Assembly) != 0)
 656                                 sb.Append ("assembly, ");
 657
 658                         if ((targets & AttributeTargets.Module) != 0)
 659                                 sb.Append ("module, ");
 660
 661                         if ((targets & AttributeTargets.Class) != 0)
 662                                 sb.Append ("class, ");
 663
 664                         if ((targets & AttributeTargets.Struct) != 0)
 665                                 sb.Append ("struct, ");
 666
 667                         if ((targets & AttributeTargets.Enum) != 0)
 668                                 sb.Append ("enum, ");
 669
 670                         if ((targets & AttributeTargets.Constructor) != 0)
 671                                 sb.Append ("constructor, ");
 672
 673                         if ((targets & AttributeTargets.Method) != 0)
 674                                 sb.Append ("method, ");
 675
 676                         if ((targets & AttributeTargets.Property) != 0)
 677                                 sb.Append ("property, indexer, ");
 678
 679                         if ((targets & AttributeTargets.Field) != 0)
 680                                 sb.Append ("field, ");
 681
 682                         if ((targets & AttributeTargets.Event) != 0)
 683                                 sb.Append ("event, ");
 684
 685                         if ((targets & AttributeTargets.Interface) != 0)
 686                                 sb.Append ("interface, ");
 687
 688                         if ((targets & AttributeTargets.Parameter) != 0)
 689                                 sb.Append ("parameter, ");
 690
 691                         if ((targets & AttributeTargets.Delegate) != 0)
 692                                 sb.Append ("delegate, ");
 693
 694                         if ((targets & AttributeTargets.ReturnValue) != 0)
 695                                 sb.Append ("return, ");
 696
 697                         if ((targets & AttributeTargets.GenericParameter) != 0)
 698                                 sb.Append ("type parameter, ");
 699
 700                         return sb.Remove (sb.Length - 2, 2).ToString ();
 701                 }
 702
 703                 /// <summary>
 704                 /// Returns AttributeUsage attribute based on types hierarchy
 705                 /// </summary>
 706                 static AttributeUsageAttribute GetAttributeUsage (Type type)
 707                 {
 708                         AttributeUsageAttribute ua = usage_attr_cache [type] as AttributeUsageAttribute;
 709                         if (ua != null)
 710                                 return ua;
 711
 712                         Class attr_class = TypeManager.LookupClass (type);
 713                         PredefinedAttribute pa = PredefinedAttributes.Get.AttributeUsage;
 714
 715                         if (attr_class == null) {
 716                                 if (!pa.IsDefined)
 717                                         return new AttributeUsageAttribute (0);
 718
 719                                 object[] usage_attr = type.GetCustomAttributes (pa.Type, true);
 720                                 ua = (AttributeUsageAttribute)usage_attr [0];
 721                                 usage_attr_cache.Add (type, ua);
 722                                 return ua;
 723                         }
 724
 725                         Attribute a = null;
 726                         if (attr_class.OptAttributes != null)
 727                                 a = attr_class.OptAttributes.Search (pa);
 728
 729                         if (a == null) {
 730                                 if (attr_class.TypeBuilder.BaseType != TypeManager.attribute_type)
 731                                         ua = GetAttributeUsage (attr_class.TypeBuilder.BaseType);
 732                                 else
 733                                         ua = DefaultUsageAttribute;
 734                         } else {
 735                                 ua = a.GetAttributeUsageAttribute ();
 736                         }
 737
 738                         usage_attr_cache.Add (type, ua);
 739                         return ua;
 740                 }
 741
 742                 AttributeUsageAttribute GetAttributeUsageAttribute ()
 743                 {
 744                         if (pos_values == null)
 745                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 746                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 747                                 Resolve ();
 748
 749                         if (resolve_error)
 750                                 return DefaultUsageAttribute;
 751
 752                         AttributeUsageAttribute usage_attribute = new AttributeUsageAttribute ((AttributeTargets)pos_values [0]);
 753
 754                         object field = GetPropertyValue ("AllowMultiple");
 755                         if (field != null)
 756                                 usage_attribute.AllowMultiple = (bool)field;
 757
 758                         field = GetPropertyValue ("Inherited");
 759                         if (field != null)
 760                                 usage_attribute.Inherited = (bool)field;
 761
 762                         return usage_attribute;
 763                 }
 764
 765                 /// <summary>
 766                 /// Returns custom name of indexer
 767                 /// </summary>
 768                 public string GetIndexerAttributeValue ()
 769                 {
 770                         if (pos_values == null)
 771                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 772                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 773                                 Resolve ();
 774
 775                         if (resolve_error)
 776                                 return null;
 777
 778                         return pos_values [0] as string;
 779                 }
 780
 781                 /// <summary>
 782                 /// Returns condition of ConditionalAttribute
 783                 /// </summary>
 784                 public string GetConditionalAttributeValue ()
 785                 {
 786                         if (pos_values == null)
 787                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 788                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 789                                 Resolve ();
 790
 791                         if (resolve_error)
 792                                 return null;
 793
 794                         return (string)pos_values [0];
 795                 }
 796
 797                 /// <summary>
 798                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 799                 /// </summary>
 800                 public ObsoleteAttribute GetObsoleteAttribute ()
 801                 {
 802                         if (pos_values == null)
 803                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 804                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 805                                 Resolve ();
 806
 807                         if (resolve_error)
 808                                 return null;
 809
 810                         if (pos_values == null || pos_values.Length == 0)
 811                                 return new ObsoleteAttribute ();
 812
 813                         if (pos_values.Length == 1)
 814                                 return new ObsoleteAttribute ((string)pos_values [0]);
 815
 816                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 817                 }
 818
 819                 /// <summary>
 820                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 821                 /// before ApplyAttribute. We need to resolve the arguments.
 822                 /// This situation occurs when class deps is differs from Emit order.
 823                 /// </summary>
 824                 public bool GetClsCompliantAttributeValue ()
 825                 {
 826                         if (pos_values == null)
 827                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 828                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 829                                 Resolve ();
 830
 831                         if (resolve_error)
 832                                 return false;
 833
 834                         return (bool)pos_values [0];
 835                 }
 836
 837                 public Type GetCoClassAttributeValue ()
 838                 {
 839                         if (pos_values == null)
 840                                 Resolve ();
 841
 842                         if (resolve_error)
 843                                 return null;
 844
 845                         return (Type)pos_values [0];
 846                 }
 847
 848                 public bool CheckTarget ()
 849                 {
 850                         string[] valid_targets = Owner.ValidAttributeTargets;
 851                         if (ExplicitTarget == null || ExplicitTarget == valid_targets [0]) {
 852                                 Target = Owner.AttributeTargets;
 853                                 return true;
 854                         }
 855
 856                         // TODO: we can skip the first item
 857                         if (((IList) valid_targets).Contains (ExplicitTarget)) {
 858                                 switch (ExplicitTarget) {
 859                                 case "return": Target = AttributeTargets.ReturnValue; return true;
 860                                 case "param": Target = AttributeTargets.Parameter; return true;
 861                                 case "field": Target = AttributeTargets.Field; return true;
 862                                 case "method": Target = AttributeTargets.Method; return true;
 863                                 case "property": Target = AttributeTargets.Property; return true;
 864                                 }
 865                                 throw new InternalErrorException ("Unknown explicit target: " + ExplicitTarget);
 866                         }
 867
 868                         StringBuilder sb = new StringBuilder ();
 869                         foreach (string s in valid_targets) {
 870                                 sb.Append (s);
 871                                 sb.Append (", ");
 872                         }
 873                         sb.Remove (sb.Length - 2, 2);
 874                         Report.Error (657, Location, "`{0}' is not a valid attribute location for this declaration. " +
 875                                 "Valid attribute locations for this declaration are `{1}'", ExplicitTarget, sb.ToString ());
 876                         return false;
 877                 }
 878
 879                 /// <summary>
 880                 /// Tests permitted SecurityAction for assembly or other types
 881                 /// </summary>
 882                 protected virtual bool IsSecurityActionValid (bool for_assembly)
 883                 {
 884                         SecurityAction action = GetSecurityActionValue ();
 885
 886                         switch (action) {
 887                         case SecurityAction.Demand:
 888                         case SecurityAction.Assert:
 889                         case SecurityAction.Deny:
 890                         case SecurityAction.PermitOnly:
 891                         case SecurityAction.LinkDemand:
 892                         case SecurityAction.InheritanceDemand:
 893                                 if (!for_assembly)
 894                                         return true;
 895                                 break;
 896
 897                         case SecurityAction.RequestMinimum:
 898                         case SecurityAction.RequestOptional:
 899                         case SecurityAction.RequestRefuse:
 900                                 if (for_assembly)
 901                                         return true;
 902                                 break;
 903
 904                         default:
 905                                 Error_AttributeEmitError ("SecurityAction is out of range");
 906                                 return false;
 907                         }
 908
 909                         Error_AttributeEmitError (String.Concat ("SecurityAction `", action, "' is not valid for this declaration"));
 910                         return false;
 911                 }
 912
 913                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 914                 {
 915                         return (SecurityAction)pos_values [0];
 916                 }
 917
 918                 /// <summary>
 919                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 920                 /// </summary>
 921                 /// <returns></returns>
 922                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 923                 {
 924                         Type orig_assembly_type = null;
 925
 926                         if (TypeManager.LookupDeclSpace (Type) != null) {
 927                                 if (!RootContext.StdLib) {
 928                                         orig_assembly_type = Type.GetType (Type.FullName);
 929                                 } else {
 930                                         string orig_version_path = Environment.GetEnvironmentVariable ("__SECURITY_BOOTSTRAP_DB");
 931                                         if (orig_version_path == null) {
 932                                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 933                                                 return;
 934                                         }
 935
 936                                         if (orig_sec_assembly == null) {
 937                                                 string file = Path.Combine (orig_version_path, Driver.OutputFile);
 938                                                 orig_sec_assembly = Assembly.LoadFile (file);
 939                                         }
 940
 941                                         orig_assembly_type = orig_sec_assembly.GetType (Type.FullName, true);
 942                                         if (orig_assembly_type == null) {
 943                                                 Report.Warning (-112, 1, Location, "Self-referenced security attribute `{0}' " +
 944                                                                 "was not found in previous version of assembly");
 945                                                 return;
 946                                         }
 947                                 }
 948                         }
 949
 950                         SecurityAttribute sa;
 951                         // For all non-selfreferencing security attributes we can avoid all hacks
 952                         if (orig_assembly_type == null) {
 953                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 954
 955                                 if (prop_info_arr != null) {
 956                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 957                                                 PropertyInfo pi = prop_info_arr [i];
 958                                                 pi.SetValue (sa, prop_values_arr [i], null);
 959                                         }
 960                                 }
 961                         } else {
 962                                 // HACK: All security attributes have same ctor syntax
 963                                 sa = (SecurityAttribute) Activator.CreateInstance (orig_assembly_type, new object[] { GetSecurityActionValue () } );
 964
 965                                 // All types are from newly created assembly but for invocation with old one we need to convert them
 966                                 if (prop_info_arr != null) {
 967                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 968                                                 PropertyInfo emited_pi = prop_info_arr [i];
 969                                                 // FIXME: We are missing return type filter
 970                                                 // TODO: pi can be null
 971                                                 PropertyInfo pi = orig_assembly_type.GetProperty (emited_pi.Name);
 972
 973                                                 object old_instance = TypeManager.IsEnumType (pi.PropertyType) ?
 974                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
 975                                                         prop_values_arr [i];
 976
 977                                                 pi.SetValue (sa, old_instance, null);
 978                                         }
 979                                 }
 980                         }
 981
 982                         IPermission perm;
 983                         perm = sa.CreatePermission ();
 984                         SecurityAction action = GetSecurityActionValue ();
 985
 986                         // IS is correct because for corlib we are using an instance from old corlib
 987                         if (!(perm is System.Security.CodeAccessPermission)) {
 988                                 switch (action) {
 989                                 case SecurityAction.Demand:
 990                                         action = (SecurityAction)13;
 991                                         break;
 992                                 case SecurityAction.LinkDemand:
 993                                         action = (SecurityAction)14;
 994                                         break;
 995                                 case SecurityAction.InheritanceDemand:
 996                                         action = (SecurityAction)15;
 997                                         break;
 998                                 }
 999                         }
1000
1001                         PermissionSet ps = (PermissionSet)permissions [action];
1002                         if (ps == null) {
1003                                 if (sa is PermissionSetAttribute)
1004                                         ps = new PermissionSet (sa.Unrestricted ? PermissionState.Unrestricted : PermissionState.None);
1005                                 else
1006                                         ps = new PermissionSet (PermissionState.None);
1007
1008                                 permissions.Add (action, ps);
1009                         } else if (!ps.IsUnrestricted () && (sa is PermissionSetAttribute) && sa.Unrestricted) {
1010                                 ps = ps.Union (new PermissionSet (PermissionState.Unrestricted));
1011                                 permissions [action] = ps;
1012                         }
1013                         ps.AddPermission (perm);
1014                 }
1015
1016                 public object GetPropertyValue (string name)
1017                 {
1018                         if (prop_info_arr == null)
1019                                 return null;
1020
1021                         for (int i = 0; i < prop_info_arr.Length; ++i) {
1022                                 if (prop_info_arr [i].Name == name)
1023                                         return prop_values_arr [i];
1024                         }
1025
1026                         return null;
1027                 }
1028
1029                 //
1030                 // Theoretically, we can get rid of this, since FieldBuilder.SetCustomAttribute()
1031                 // and ParameterBuilder.SetCustomAttribute() are supposed to handle this attribute.
1032                 // However, we can't, since it appears that the .NET 1.1 SRE hangs when given a MarshalAsAttribute.
1033                 //
1034 #if false
1035                 public UnmanagedMarshal GetMarshal (Attributable attr)
1036                 {
1037                         UnmanagedType UnmanagedType;
1038                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (UnmanagedType))
1039                                 UnmanagedType = (UnmanagedType) System.Enum.ToObject (typeof (UnmanagedType), pos_values [0]);
1040                         else
1041                                 UnmanagedType = (UnmanagedType) pos_values [0];
1042
1043                         object value = GetFieldValue ("SizeParamIndex");
1044                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
1045                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
1046                                 return null;
1047                         }
1048
1049                         object o = GetFieldValue ("ArraySubType");
1050                         UnmanagedType array_sub_type = o == null ? (UnmanagedType) 0x50 /* NATIVE_MAX */ : (UnmanagedType) o;
1051
1052                         switch (UnmanagedType) {
1053                         case UnmanagedType.CustomMarshaler: {
1054                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
1055                                         BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1056                                 if (define_custom == null) {
1057                                         Report.RuntimeMissingSupport (Location, "set marshal info");
1058                                         return null;
1059                                 }
1060
1061                                 object [] args = new object [4];
1062                                 args [0] = GetFieldValue ("MarshalTypeRef");
1063                                 args [1] = GetFieldValue ("MarshalCookie");
1064                                 args [2] = GetFieldValue ("MarshalType");
1065                                 args [3] = Guid.Empty;
1066                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
1067                         }
1068                         case UnmanagedType.LPArray: {
1069                                 object size_const = GetFieldValue ("SizeConst");
1070                                 object size_param_index = GetFieldValue ("SizeParamIndex");
1071
1072                                 if ((size_const != null) || (size_param_index != null)) {
1073                                         MethodInfo define_array = typeof (UnmanagedMarshal).GetMethod ("DefineLPArrayInternal",
1074                                                 BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
1075                                         if (define_array == null) {
1076                                                 Report.RuntimeMissingSupport (Location, "set marshal info");
1077                                                 return null;
1078                                         }
1079
1080                                         object [] args = new object [3];
1081                                         args [0] = array_sub_type;
1082                                         args [1] = size_const == null ? -1 : size_const;
1083                                         args [2] = size_param_index == null ? -1 : size_param_index;
1084                                         return (UnmanagedMarshal) define_array.Invoke (null, args);
1085                                 }
1086                                 else
1087                                         return UnmanagedMarshal.DefineLPArray (array_sub_type);
1088                         }
1089                         case UnmanagedType.SafeArray:
1090                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
1091
1092                         case UnmanagedType.ByValArray:
1093                                 FieldBase fm = attr as FieldBase;
1094                                 if (fm == null) {
1095                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
1096                                         return null;
1097                                 }
1098                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
1099
1100                         case UnmanagedType.ByValTStr:
1101                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
1102
1103                         default:
1104                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
1105                         }
1106                 }
1107
1108                 object GetFieldValue (string name)
1109                 {
1110                         int i;
1111                         if (field_info_arr == null)
1112                                 return null;
1113                         i = 0;
1114                         foreach (FieldInfo fi in field_info_arr) {
1115                                 if (fi.Name == name)
1116                                         return GetValue (field_values_arr [i]);
1117                                 i++;
1118                         }
1119                         return null;
1120                 }
1121
1122                 static object GetValue (object value)
1123                 {
1124                         if (value is EnumConstant)
1125                                 return ((EnumConstant) value).GetValue ();
1126                         else
1127                                 return value;
1128                 }
1129
1130 #endif
1131
1132                 public CharSet GetCharSetValue ()
1133                 {
1134                         return (CharSet)System.Enum.Parse (typeof (CharSet), pos_values [0].ToString ());
1135                 }
1136
1137                 public bool HasField (string fieldName)
1138                 {
1139                         if (field_info_arr == null)
1140                                 return false;
1141
1142                         foreach (FieldInfo fi in field_info_arr) {
1143                                 if (fi.Name == fieldName)
1144                                         return true;
1145                         }
1146
1147                         return false;
1148                 }
1149
1150                 public bool IsInternalMethodImplAttribute {
1151                         get {
1152                                 if (Type != PredefinedAttributes.Get.MethodImpl)
1153                                         return false;
1154
1155                                 MethodImplOptions options;
1156                                 if (pos_values[0].GetType () != typeof (MethodImplOptions))
1157                                         options = (MethodImplOptions)System.Enum.ToObject (typeof (MethodImplOptions), pos_values[0]);
1158                                 else
1159                                         options = (MethodImplOptions)pos_values[0];
1160
1161                                 return (options & MethodImplOptions.InternalCall) != 0;
1162                         }
1163                 }
1164
1165                 public LayoutKind GetLayoutKindValue ()
1166                 {
1167                         if (!RootContext.StdLib || pos_values [0].GetType () != typeof (LayoutKind))
1168                                 return (LayoutKind)System.Enum.ToObject (typeof (LayoutKind), pos_values [0]);
1169
1170                         return (LayoutKind)pos_values [0];
1171                 }
1172
1173                 public object GetParameterDefaultValue ()
1174                 {
1175                         return pos_values [0];
1176                 }
1177
1178                 public override bool Equals (object obj)
1179                 {
1180                         Attribute a = obj as Attribute;
1181                         if (a == null)
1182                                 return false;
1183
1184                         return Type == a.Type && Target == a.Target;
1185                 }
1186
1187                 public override int GetHashCode ()
1188                 {
1189                         return base.GetHashCode ();
1190                 }
1191
1192                 /// <summary>
1193                 /// Emit attribute for Attributable symbol
1194                 /// </summary>
1195                 public void Emit (ListDictionary allEmitted)
1196                 {
1197                         CustomAttributeBuilder cb = Resolve ();
1198                         if (cb == null)
1199                                 return;
1200
1201                         AttributeUsageAttribute usage_attr = GetAttributeUsage (Type);
1202                         if ((usage_attr.ValidOn & Target) == 0) {
1203                                 Report.Error (592, Location, "The attribute `{0}' is not valid on this declaration type. " +
1204                                               "It is valid on `{1}' declarations only",
1205                                         GetSignatureForError (), GetValidTargets ());
1206                                 return;
1207                         }
1208
1209                         var predefined = PredefinedAttributes.Get;
1210
1211                         try {
1212                                 foreach (Attributable target in targets)
1213                                         target.ApplyAttributeBuilder (this, cb, predefined);
1214                         } catch (Exception e) {
1215                                 Error_AttributeEmitError (e.Message);
1216                                 return;
1217                         }
1218
1219                         if (!usage_attr.AllowMultiple && allEmitted != null) {
1220                                 if (allEmitted.Contains (this)) {
1221                                         ArrayList a = allEmitted [this] as ArrayList;
1222                                         if (a == null) {
1223                                                 a = new ArrayList (2);
1224                                                 allEmitted [this] = a;
1225                                         }
1226                                         a.Add (this);
1227                                 } else {
1228                                         allEmitted.Add (this, null);
1229                                 }
1230                         }
1231
1232                         if (!RootContext.VerifyClsCompliance)
1233                                 return;
1234
1235                         // Here we are testing attribute arguments for array usage (error 3016)
1236                         if (Owner.IsClsComplianceRequired ()) {
1237                                 if (PosArguments != null)
1238                                         PosArguments.CheckArrayAsAttribute (context.Compiler);
1239
1240                                 if (NamedArguments == null)
1241                                         return;
1242
1243                                 NamedArguments.CheckArrayAsAttribute (context.Compiler);
1244                         }
1245                 }
1246
1247                 private Expression GetValue ()
1248                 {
1249                         if (PosArguments == null || PosArguments.Count < 1)
1250                                 return null;
1251
1252                         return PosArguments [0].Expr;
1253                 }
1254
1255                 public string GetString ()
1256                 {
1257                         Expression e = GetValue ();
1258                         if (e is StringConstant)
1259                                 return ((StringConstant)e).Value;
1260                         return null;
1261                 }
1262
1263                 public bool GetBoolean ()
1264                 {
1265                         Expression e = GetValue ();
1266                         if (e is BoolConstant)
1267                                 return ((BoolConstant)e).Value;
1268                         return false;
1269                 }
1270
1271                 public Type GetArgumentType ()
1272                 {
1273                         TypeOf e = GetValue () as TypeOf;
1274                         if (e == null)
1275                                 return null;
1276                         return e.TypeArgument;
1277                 }
1278
1279                 public override Expression CreateExpressionTree (ResolveContext ec)
1280                 {
1281                         throw new NotSupportedException ("ET");
1282                 }
1283
1284                 protected override Expression DoResolve (ResolveContext ec)
1285                 {
1286                         throw new NotImplementedException ();
1287                 }
1288
1289                 public override void Emit (EmitContext ec)
1290                 {
1291                         throw new NotImplementedException ();
1292                 }
1293         }
1294
1295
1296         /// <summary>
1297         /// For global attributes (assembly, module) we need special handling.
1298         /// Attributes can be located in the several files
1299         /// </summary>
1300         public class GlobalAttribute : Attribute
1301         {
1302                 public readonly NamespaceEntry ns;
1303
1304                 public GlobalAttribute (NamespaceEntry ns, string target, ATypeNameExpression expression,
1305                                         Arguments[] args, Location loc, bool nameEscaped):
1306                         base (target, expression, args, loc, nameEscaped)
1307                 {
1308                         this.ns = ns;
1309                 }
1310
1311                 public override void AttachTo (Attributable target, IMemberContext context)
1312                 {
1313                         if (ExplicitTarget == "assembly") {
1314                                 base.AttachTo (CodeGen.Assembly, context);
1315                                 return;
1316                         }
1317
1318                         if (ExplicitTarget == "module") {
1319                                 base.AttachTo (RootContext.ToplevelTypes, context);
1320                                 return;
1321                         }
1322
1323                         throw new NotImplementedException ("Unknown global explicit target " + ExplicitTarget);
1324                 }
1325
1326                 void Enter ()
1327                 {
1328                         // RootContext.ToplevelTypes has a single NamespaceEntry which gets overwritten
1329                         // each time a new file is parsed.  However, we need to use the NamespaceEntry
1330                         // in effect where the attribute was used.  Since code elsewhere cannot assume
1331                         // that the NamespaceEntry is right, just overwrite it.
1332                         //
1333                         // Precondition: RootContext.ToplevelTypes == null
1334
1335                         if (RootContext.ToplevelTypes.NamespaceEntry != null)
1336                                 throw new InternalErrorException (Location + " non-null NamespaceEntry");
1337
1338                         RootContext.ToplevelTypes.NamespaceEntry = ns;
1339                 }
1340
1341                 protected override bool IsSecurityActionValid (bool for_assembly)
1342                 {
1343                         return base.IsSecurityActionValid (true);
1344                 }
1345
1346                 void Leave ()
1347                 {
1348                         RootContext.ToplevelTypes.NamespaceEntry = null;
1349                 }
1350
1351                 protected override TypeExpr ResolveAsTypeTerminal (Expression expr, IMemberContext ec)
1352                 {
1353                         try {
1354                                 Enter ();
1355                                 return base.ResolveAsTypeTerminal (expr, ec);
1356                         }
1357                         finally {
1358                                 Leave ();
1359                         }
1360                 }
1361
1362                 protected override ConstructorInfo ResolveConstructor (ResolveContext ec)
1363                 {
1364                         try {
1365                                 Enter ();
1366                                 return base.ResolveConstructor (ec);
1367                         }
1368                         finally {
1369                                 Leave ();
1370                         }
1371                 }
1372
1373                 protected override bool ResolveNamedArguments (ResolveContext ec)
1374                 {
1375                         try {
1376                                 Enter ();
1377                                 return base.ResolveNamedArguments (ec);
1378                         }
1379                         finally {
1380                                 Leave ();
1381                         }
1382                 }
1383         }
1384
1385         public class Attributes {
1386                 public readonly ArrayList Attrs;
1387
1388                 public Attributes (Attribute a)
1389                 {
1390                         Attrs = new ArrayList ();
1391                         Attrs.Add (a);
1392                 }
1393
1394                 public Attributes (ArrayList attrs)
1395                 {
1396                         Attrs = attrs;
1397                 }
1398
1399                 public void AddAttributes (ArrayList attrs)
1400                 {
1401                         Attrs.AddRange (attrs);
1402                 }
1403
1404                 public void AttachTo (Attributable attributable, IMemberContext context)
1405                 {
1406                         foreach (Attribute a in Attrs)
1407                                 a.AttachTo (attributable, context);
1408                 }
1409
1410                 public Attributes Clone ()
1411                 {
1412                         ArrayList al = new ArrayList (Attrs.Count);
1413                         foreach (Attribute a in Attrs)
1414                                 al.Add (a.Clone ());
1415
1416                         return new Attributes (al);
1417                 }
1418
1419                 /// <summary>
1420                 /// Checks whether attribute target is valid for the current element
1421                 /// </summary>
1422                 public bool CheckTargets ()
1423                 {
1424                         foreach (Attribute a in Attrs) {
1425                                 if (!a.CheckTarget ())
1426                                         return false;
1427                         }
1428                         return true;
1429                 }
1430
1431                 public Attribute Search (PredefinedAttribute t)
1432                 {
1433                         foreach (Attribute a in Attrs) {
1434                                 if (a.ResolveType () == t)
1435                                         return a;
1436                         }
1437                         return null;
1438                 }
1439
1440                 /// <summary>
1441                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1442                 /// </summary>
1443                 public Attribute[] SearchMulti (PredefinedAttribute t)
1444                 {
1445                         ArrayList ar = null;
1446
1447                         foreach (Attribute a in Attrs) {
1448                                 if (a.ResolveType () == t) {
1449                                         if (ar == null)
1450                                                 ar = new ArrayList ();
1451                                         ar.Add (a);
1452                                 }
1453                         }
1454
1455                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1456                 }
1457
1458                 public void Emit ()
1459                 {
1460                         CheckTargets ();
1461
1462                         ListDictionary ld = Attrs.Count > 1 ? new ListDictionary () : null;
1463
1464                         foreach (Attribute a in Attrs)
1465                                 a.Emit (ld);
1466
1467                         if (ld == null || ld.Count == 0)
1468                                 return;
1469
1470                         foreach (DictionaryEntry d in ld) {
1471                                 if (d.Value == null)
1472                                         continue;
1473
1474                                 Attribute a = (Attribute) d.Key;
1475
1476                                 foreach (Attribute collision in (ArrayList)d.Value)
1477                                         a.Report.SymbolRelatedToPreviousError (collision.Location, "");
1478
1479                                 a.Report.Error (579, a.Location, "The attribute `{0}' cannot be applied multiple times",
1480                                         a.GetSignatureForError ());
1481                         }
1482                 }
1483
1484                 public bool Contains (PredefinedAttribute t)
1485                 {
1486                         return Search (t) != null;
1487                 }
1488         }
1489
1490         /// <summary>
1491         /// Helper class for attribute verification routine.
1492         /// </summary>
1493         sealed class AttributeTester
1494         {
1495                 static PtrHashtable analyzed_types;
1496                 static PtrHashtable analyzed_types_obsolete;
1497                 static PtrHashtable analyzed_member_obsolete;
1498                 static PtrHashtable analyzed_method_excluded;
1499                 static PtrHashtable fixed_buffer_cache;
1500
1501                 static object TRUE = new object ();
1502                 static object FALSE = new object ();
1503
1504                 static AttributeTester ()
1505                 {
1506                         Reset ();
1507                 }
1508
1509                 private AttributeTester ()
1510                 {
1511                 }
1512
1513                 public static void Reset ()
1514                 {
1515                         analyzed_types = new PtrHashtable ();
1516                         analyzed_types_obsolete = new PtrHashtable ();
1517                         analyzed_member_obsolete = new PtrHashtable ();
1518                         analyzed_method_excluded = new PtrHashtable ();
1519                         fixed_buffer_cache = new PtrHashtable ();
1520                 }
1521
1522                 public enum Result {
1523                         Ok,
1524                         RefOutArrayError,
1525                         ArrayArrayError
1526                 }
1527
1528                 /// <summary>
1529                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1530                 /// It tests differing only in ref or out, or in array rank.
1531                 /// </summary>
1532                 public static Result AreOverloadedMethodParamsClsCompliant (AParametersCollection pa, AParametersCollection pb)
1533                 {
1534                         Type [] types_a = pa.Types;
1535                         Type [] types_b = pb.Types;
1536                         if (types_a == null || types_b == null)
1537                                 return Result.Ok;
1538
1539                         if (types_a.Length != types_b.Length)
1540                                 return Result.Ok;
1541
1542                         Result result = Result.Ok;
1543                         for (int i = 0; i < types_b.Length; ++i) {
1544                                 Type aType = types_a [i];
1545                                 Type bType = types_b [i];
1546
1547                                 if (aType.IsArray && bType.IsArray) {
1548                                         Type a_el_type = TypeManager.GetElementType (aType);
1549                                         Type b_el_type = TypeManager.GetElementType (bType);
1550                                         if (aType.GetArrayRank () != bType.GetArrayRank () && a_el_type == b_el_type) {
1551                                                 result = Result.RefOutArrayError;
1552                                                 continue;
1553                                         }
1554
1555                                         if (a_el_type.IsArray || b_el_type.IsArray) {
1556                                                 result = Result.ArrayArrayError;
1557                                                 continue;
1558                                         }
1559                                 }
1560
1561                                 if (aType != bType)
1562                                         return Result.Ok;
1563
1564                                 const Parameter.Modifier out_ref_mod = (Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK);
1565                                 if ((pa.FixedParameters[i].ModFlags & out_ref_mod) != (pb.FixedParameters[i].ModFlags & out_ref_mod))
1566                                         result = Result.RefOutArrayError;
1567                         }
1568                         return result;
1569                 }
1570
1571                 /// <summary>
1572                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1573                 /// </summary>
1574                 public static bool IsClsCompliant (Type type)
1575                 {
1576                         if (type == null)
1577                                 return true;
1578
1579                         object type_compliance = analyzed_types[type];
1580                         if (type_compliance != null)
1581                                 return type_compliance == TRUE;
1582
1583                         if (type.IsPointer) {
1584                                 analyzed_types.Add (type, FALSE);
1585                                 return false;
1586                         }
1587
1588                         bool result;
1589                         if (type.IsArray) {
1590                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1591                         } else if (TypeManager.IsNullableType (type)) {
1592                                 result = IsClsCompliant (TypeManager.TypeToCoreType (TypeManager.GetTypeArguments (type) [0]));
1593                         } else {
1594                                 result = AnalyzeTypeCompliance (type);
1595                         }
1596                         analyzed_types.Add (type, result ? TRUE : FALSE);
1597                         return result;
1598                 }
1599
1600                 /// <summary>
1601                 /// Returns IFixedBuffer implementation if field is fixed buffer else null.
1602                 /// </summary>
1603                 public static IFixedBuffer GetFixedBuffer (FieldInfo fi)
1604                 {
1605                         // Fixed buffer helper type is generated as value type
1606                         if (TypeManager.IsReferenceType (fi.FieldType))
1607                                 return null;
1608
1609                         FieldBase fb = TypeManager.GetField (fi);
1610                         if (fb != null) {
1611                                 return fb as IFixedBuffer;
1612                         }
1613
1614                         if (TypeManager.GetConstant (fi) != null)
1615                                 return null;
1616
1617                         object o = fixed_buffer_cache [fi];
1618                         if (o == null) {
1619                                 PredefinedAttribute pa = PredefinedAttributes.Get.FixedBuffer;
1620                                 if (!pa.IsDefined)
1621                                         return null;
1622
1623                                 if (!fi.IsDefined (pa.Type, false)) {
1624                                         fixed_buffer_cache.Add (fi, FALSE);
1625                                         return null;
1626                                 }
1627
1628                                 IFixedBuffer iff = new FixedFieldExternal (fi);
1629                                 fixed_buffer_cache.Add (fi, iff);
1630                                 return iff;
1631                         }
1632
1633                         if (o == FALSE)
1634                                 return null;
1635
1636                         return (IFixedBuffer)o;
1637                 }
1638
1639                 public static void VerifyModulesClsCompliance (CompilerContext ctx)
1640                 {
1641                         Module[] modules = GlobalRootNamespace.Instance.Modules;
1642                         if (modules == null)
1643                                 return;
1644
1645                         // The first module is generated assembly
1646                         for (int i = 1; i < modules.Length; ++i) {
1647                                 Module module = modules [i];
1648                                 if (!GetClsCompliantAttributeValue (module, null)) {
1649                                         ctx.Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute " +
1650                                                       "to match the assembly", module.Name);
1651                                         return;
1652                                 }
1653                         }
1654                 }
1655
1656                 public static Type GetImportedIgnoreCaseClsType (string name)
1657                 {
1658                         foreach (Assembly a in GlobalRootNamespace.Instance.Assemblies) {
1659                                 Type t = a.GetType (name, false, true);
1660                                 if (t == null)
1661                                         continue;
1662
1663                                 if (IsClsCompliant (t))
1664                                         return t;
1665                         }
1666                         return null;
1667                 }
1668
1669                 static bool GetClsCompliantAttributeValue (ICustomAttributeProvider attribute_provider, Assembly a)
1670                 {
1671                         PredefinedAttribute pa = PredefinedAttributes.Get.CLSCompliant;
1672                         if (!pa.IsDefined)
1673                                 return false;
1674
1675                         object[] cls_attr = attribute_provider.GetCustomAttributes (pa.Type, false);
1676                         if (cls_attr.Length == 0) {
1677                                 if (a == null)
1678                                         return false;
1679
1680                                 return GetClsCompliantAttributeValue (a, null);
1681                         }
1682
1683                         return ((CLSCompliantAttribute)cls_attr [0]).IsCompliant;
1684                 }
1685
1686                 static bool AnalyzeTypeCompliance (Type type)
1687                 {
1688                         type = TypeManager.DropGenericTypeArguments (type);
1689                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1690                         if (ds != null) {
1691                                 return ds.IsClsComplianceRequired ();
1692                         }
1693
1694                         if (TypeManager.IsGenericParameter (type))
1695                                 return true;
1696
1697                         return GetClsCompliantAttributeValue (type, type.Assembly);
1698                 }
1699
1700                 /// <summary>
1701                 /// Returns instance of ObsoleteAttribute when type is obsolete
1702                 /// </summary>
1703                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1704                 {
1705                         object type_obsolete = analyzed_types_obsolete [type];
1706                         if (type_obsolete == FALSE)
1707                                 return null;
1708
1709                         if (type_obsolete != null)
1710                                 return (ObsoleteAttribute)type_obsolete;
1711
1712                         ObsoleteAttribute result = null;
1713                         if (TypeManager.HasElementType (type)) {
1714                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1715                         } else if (TypeManager.IsGenericParameter (type))
1716                                 result = null;  // TODO: throw new NotSupportedException ()
1717                         else if (TypeManager.IsGenericType (type) && !TypeManager.IsGenericTypeDefinition (type)) {
1718                                 return GetObsoleteAttribute (TypeManager.DropGenericTypeArguments (type));
1719                         } else {
1720                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1721
1722                                 // Type is external, we can get attribute directly
1723                                 if (type_ds == null) {
1724                                         PredefinedAttribute pa = PredefinedAttributes.Get.Obsolete;
1725                                         if (pa.IsDefined) {
1726                                                 object[] attribute = type.GetCustomAttributes (pa.Type, false);
1727                                                 if (attribute.Length == 1)
1728                                                         result = (ObsoleteAttribute) attribute[0];
1729                                         }
1730                                 } else {
1731                                         result = type_ds.GetObsoleteAttribute ();
1732                                 }
1733                         }
1734
1735                         // Cannot use .Add because of corlib bootstrap
1736                         analyzed_types_obsolete [type] = result == null ? FALSE : result;
1737                         return result;
1738                 }
1739
1740                 /// <summary>
1741                 /// Returns instance of ObsoleteAttribute when method is obsolete
1742                 /// </summary>
1743                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1744                 {
1745                         IMethodData mc = TypeManager.GetMethod (mb);
1746                         if (mc != null)
1747                                 return mc.GetObsoleteAttribute ();
1748
1749                         // compiler generated methods are not registered by AddMethod
1750                         if (mb.DeclaringType is TypeBuilder)
1751                                 return null;
1752
1753                         MemberInfo mi = TypeManager.GetPropertyFromAccessor (mb);
1754                         if (mi != null)
1755                                 return GetMemberObsoleteAttribute (mi);
1756
1757                         mi = TypeManager.GetEventFromAccessor (mb);
1758                         if (mi != null)
1759                                 return GetMemberObsoleteAttribute (mi);
1760
1761                         return GetMemberObsoleteAttribute (mb);
1762                 }
1763
1764                 /// <summary>
1765                 /// Returns instance of ObsoleteAttribute when member is obsolete
1766                 /// </summary>
1767                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1768                 {
1769                         object type_obsolete = analyzed_member_obsolete [mi];
1770                         if (type_obsolete == FALSE)
1771                                 return null;
1772
1773                         if (type_obsolete != null)
1774                                 return (ObsoleteAttribute)type_obsolete;
1775
1776                         if ((mi.DeclaringType is TypeBuilder) || TypeManager.IsGenericType (mi.DeclaringType))
1777                                 return null;
1778
1779                         PredefinedAttribute pa = PredefinedAttributes.Get.Obsolete;
1780                         if (!pa.IsDefined)
1781                                 return null;
1782
1783                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, pa.Type, false)
1784                                 as ObsoleteAttribute;
1785                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1786                         return oa;
1787                 }
1788
1789                 /// <summary>
1790                 /// Common method for Obsolete error/warning reporting.
1791                 /// </summary>
1792                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc, Report Report)
1793                 {
1794                         if (oa.IsError) {
1795                                 Report.Error (619, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1796                                 return;
1797                         }
1798
1799                         if (oa.Message == null || oa.Message.Length == 0) {
1800                                 Report.Warning (612, 1, loc, "`{0}' is obsolete", member);
1801                                 return;
1802                         }
1803                         Report.Warning (618, 2, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1804                 }
1805
1806                 public static bool IsConditionalMethodExcluded (MethodBase mb, Location loc)
1807                 {
1808                         object excluded = analyzed_method_excluded [mb];
1809                         if (excluded != null)
1810                                 return excluded == TRUE ? true : false;
1811
1812                         PredefinedAttribute pa = PredefinedAttributes.Get.Conditional;
1813                         if (!pa.IsDefined)
1814                                 return false;
1815
1816                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (pa.Type, true)
1817                                 as ConditionalAttribute[];
1818                         if (attrs.Length == 0) {
1819                                 analyzed_method_excluded.Add (mb, FALSE);
1820                                 return false;
1821                         }
1822
1823                         foreach (ConditionalAttribute a in attrs) {
1824                                 if (loc.CompilationUnit.IsConditionalDefined (a.ConditionString)) {
1825                                         analyzed_method_excluded.Add (mb, FALSE);
1826                                         return false;
1827                                 }
1828                         }
1829
1830                         analyzed_method_excluded.Add (mb, TRUE);
1831                         return true;
1832                 }
1833
1834                 /// <summary>
1835                 /// Analyzes class whether it has attribute which has ConditionalAttribute
1836                 /// and its condition is not defined.
1837                 /// </summary>
1838                 public static bool IsAttributeExcluded (Type type, Location loc)
1839                 {
1840                         if (!type.IsClass)
1841                                 return false;
1842
1843                         Class class_decl = TypeManager.LookupDeclSpace (type) as Class;
1844
1845                         // TODO: add caching
1846                         // TODO: merge all Type bases attribute caching to one cache to save memory
1847                         PredefinedAttribute pa = PredefinedAttributes.Get.Conditional;
1848                         if (class_decl == null && pa.IsDefined) {
1849                                 object[] attributes = type.GetCustomAttributes (pa.Type, false);
1850                                 foreach (ConditionalAttribute ca in attributes) {
1851                                         if (loc.CompilationUnit.IsConditionalDefined (ca.ConditionString))
1852                                                 return false;
1853                                 }
1854                                 return attributes.Length > 0;
1855                         }
1856
1857                         return class_decl.IsExcluded ();
1858                 }
1859
1860                 public static Type GetCoClassAttribute (Type type)
1861                 {
1862                         TypeContainer tc = TypeManager.LookupInterface (type);
1863                         PredefinedAttribute pa = PredefinedAttributes.Get.CoClass;
1864                         if (tc == null) {
1865                                 if (!pa.IsDefined)
1866                                         return null;
1867
1868                                 object[] o = type.GetCustomAttributes (pa.Type, false);
1869                                 if (o.Length < 1)
1870                                         return null;
1871                                 return ((System.Runtime.InteropServices.CoClassAttribute)o[0]).CoClass;
1872                         }
1873
1874                         if (tc.OptAttributes == null)
1875                                 return null;
1876
1877                         Attribute a = tc.OptAttributes.Search (pa);
1878                         if (a == null)
1879                                 return null;
1880
1881                         return a.GetCoClassAttributeValue ();
1882                 }
1883         }
1884
1885         public class PredefinedAttributes
1886         {
1887                 // Core types
1888                 public readonly PredefinedAttribute ParamArray;
1889                 public readonly PredefinedAttribute Out;
1890
1891                 // Optional types
1892                 public readonly PredefinedAttribute Obsolete;
1893                 public readonly PredefinedAttribute DllImport;
1894                 public readonly PredefinedAttribute MethodImpl;
1895                 public readonly PredefinedAttribute MarshalAs;
1896                 public readonly PredefinedAttribute In;
1897                 public readonly PredefinedAttribute IndexerName;
1898                 public readonly PredefinedAttribute Conditional;
1899                 public readonly PredefinedAttribute CLSCompliant;
1900                 public readonly PredefinedAttribute Security;
1901                 public readonly PredefinedAttribute Required;
1902                 public readonly PredefinedAttribute Guid;
1903                 public readonly PredefinedAttribute AssemblyCulture;
1904                 public readonly PredefinedAttribute AssemblyVersion;
1905                 public readonly PredefinedAttribute ComImport;
1906                 public readonly PredefinedAttribute CoClass;
1907                 public readonly PredefinedAttribute AttributeUsage;
1908                 public readonly PredefinedAttribute DefaultParameterValue;
1909                 public readonly PredefinedAttribute OptionalParameter;
1910
1911                 // New in .NET 2.0
1912                 public readonly PredefinedAttribute DefaultCharset;
1913                 public readonly PredefinedAttribute TypeForwarder;
1914                 public readonly PredefinedAttribute FixedBuffer;
1915                 public readonly PredefinedAttribute CompilerGenerated;
1916                 public readonly PredefinedAttribute InternalsVisibleTo;
1917                 public readonly PredefinedAttribute RuntimeCompatibility;
1918                 public readonly PredefinedAttribute DebuggerHidden;
1919                 public readonly PredefinedAttribute UnsafeValueType;
1920
1921                 // New in .NET 3.5
1922                 public readonly PredefinedAttribute Extension;
1923
1924                 // New in .NET 4.0
1925                 public readonly PredefinedAttribute Dynamic;
1926
1927                 //
1928                 // Optional types which are used as types and for member lookup
1929                 //
1930                 public readonly PredefinedAttribute DefaultMember;
1931                 public readonly PredefinedAttribute DecimalConstant;
1932                 public readonly PredefinedAttribute StructLayout;
1933                 public readonly PredefinedAttribute FieldOffset;
1934
1935                 public static PredefinedAttributes Get = new PredefinedAttributes ();
1936
1937                 private PredefinedAttributes ()
1938                 {
1939                         ParamArray = new PredefinedAttribute ("System", "ParamArrayAttribute");
1940                         Out = new PredefinedAttribute ("System.Runtime.InteropServices", "OutAttribute");
1941
1942                         Obsolete = new PredefinedAttribute ("System", "ObsoleteAttribute");
1943                         DllImport = new PredefinedAttribute ("System.Runtime.InteropServices", "DllImportAttribute");
1944                         MethodImpl = new PredefinedAttribute ("System.Runtime.CompilerServices", "MethodImplAttribute");
1945                         MarshalAs = new PredefinedAttribute ("System.Runtime.InteropServices", "MarshalAsAttribute");
1946                         In = new PredefinedAttribute ("System.Runtime.InteropServices", "InAttribute");
1947                         IndexerName = new PredefinedAttribute ("System.Runtime.CompilerServices", "IndexerNameAttribute");
1948                         Conditional = new PredefinedAttribute ("System.Diagnostics", "ConditionalAttribute");
1949                         CLSCompliant = new PredefinedAttribute ("System", "CLSCompliantAttribute");
1950                         Security = new PredefinedAttribute ("System.Security.Permissions", "SecurityAttribute");
1951                         Required = new PredefinedAttribute ("System.Runtime.CompilerServices", "RequiredAttributeAttribute");
1952                         Guid = new PredefinedAttribute ("System.Runtime.InteropServices", "GuidAttribute");
1953                         AssemblyCulture = new PredefinedAttribute ("System.Reflection", "AssemblyCultureAttribute");
1954                         AssemblyVersion = new PredefinedAttribute ("System.Reflection", "AssemblyVersionAttribute");
1955                         ComImport = new PredefinedAttribute ("System.Runtime.InteropServices", "ComImportAttribute");
1956                         CoClass = new PredefinedAttribute ("System.Runtime.InteropServices", "CoClassAttribute");
1957                         AttributeUsage = new PredefinedAttribute ("System", "AttributeUsageAttribute");
1958                         DefaultParameterValue = new PredefinedAttribute ("System.Runtime.InteropServices", "DefaultParameterValueAttribute");
1959                         OptionalParameter = new PredefinedAttribute ("System.Runtime.InteropServices", "OptionalAttribute");
1960
1961                         DefaultCharset = new PredefinedAttribute ("System.Runtime.InteropServices", "DefaultCharSetAttribute");
1962                         TypeForwarder = new PredefinedAttribute ("System.Runtime.CompilerServices", "TypeForwardedToAttribute");
1963                         FixedBuffer = new PredefinedAttribute ("System.Runtime.CompilerServices", "FixedBufferAttribute");
1964                         CompilerGenerated = new PredefinedAttribute ("System.Runtime.CompilerServices", "CompilerGeneratedAttribute");
1965                         InternalsVisibleTo = new PredefinedAttribute ("System.Runtime.CompilerServices", "InternalsVisibleToAttribute");
1966                         RuntimeCompatibility = new PredefinedAttribute ("System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1967                         DebuggerHidden = new PredefinedAttribute ("System.Diagnostics", "DebuggerHiddenAttribute");
1968                         UnsafeValueType = new PredefinedAttribute ("System.Runtime.CompilerServices", "UnsafeValueTypeAttribute");
1969
1970                         Extension = new PredefinedAttribute ("System.Runtime.CompilerServices", "ExtensionAttribute");
1971
1972                         Dynamic = new PredefinedAttribute ("System.Runtime.CompilerServices", "DynamicAttribute");
1973
1974                         DefaultMember = new PredefinedAttribute ("System.Reflection", "DefaultMemberAttribute");
1975                         DecimalConstant = new PredefinedAttribute ("System.Runtime.CompilerServices", "DecimalConstantAttribute");
1976                         StructLayout = new PredefinedAttribute ("System.Runtime.InteropServices", "StructLayoutAttribute");
1977                         FieldOffset = new PredefinedAttribute ("System.Runtime.InteropServices", "FieldOffsetAttribute");
1978                 }
1979
1980                 public void Initialize (CompilerContext ctx)
1981                 {
1982                         foreach (FieldInfo fi in GetType ().GetFields (BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly)) {
1983                                 ((PredefinedAttribute) fi.GetValue (this)).Initialize (ctx, true);
1984                         }
1985                 }
1986
1987                 public static void Reset ()
1988                 {
1989                         Get = new PredefinedAttributes ();
1990                 }
1991         }
1992
1993         public class PredefinedAttribute
1994         {
1995                 Type type;
1996                 CustomAttributeBuilder cab;
1997                 ConstructorInfo ctor;
1998                 readonly string ns, name;
1999                 CompilerContext compiler;
2000
2001                 static readonly Type NotFound = typeof (PredefinedAttribute);
2002
2003                 public PredefinedAttribute (string ns, string name)
2004                 {
2005                         this.ns = ns;
2006                         this.name = name;
2007                 }
2008
2009                 public static bool operator == (Type type, PredefinedAttribute pa)
2010                 {
2011                         return type == pa.type;
2012                 }
2013
2014                 public static bool operator != (Type type, PredefinedAttribute pa)
2015                 {
2016                         return type != pa.type;
2017                 }
2018
2019                 public ConstructorInfo Constructor {
2020                         get { return ctor; }
2021                 }
2022
2023                 public override int GetHashCode ()
2024                 {
2025                         return base.GetHashCode ();
2026                 }
2027
2028                 public string GetSignatureForError ()
2029                 {
2030                         return ns + "." + name;
2031                 }
2032
2033                 public override bool Equals (object obj)
2034                 {
2035                         throw new NotSupportedException ();
2036                 }
2037
2038                 public void EmitAttribute (ConstructorBuilder builder)
2039                 {
2040                         if (ResolveBuilder ())
2041                                 builder.SetCustomAttribute (cab);
2042                 }
2043
2044                 public void EmitAttribute (MethodBuilder builder)
2045                 {
2046                         if (ResolveBuilder ())
2047                                 builder.SetCustomAttribute (cab);
2048                 }
2049
2050                 public void EmitAttribute (PropertyBuilder builder)
2051                 {
2052                         if (ResolveBuilder ())
2053                                 builder.SetCustomAttribute (cab);
2054                 }
2055
2056                 public void EmitAttribute (FieldBuilder builder)
2057                 {
2058                         if (ResolveBuilder ())
2059                                 builder.SetCustomAttribute (cab);
2060                 }
2061
2062                 public void EmitAttribute (TypeBuilder builder)
2063                 {
2064                         if (ResolveBuilder ())
2065                                 builder.SetCustomAttribute (cab);
2066                 }
2067
2068                 public void EmitAttribute (AssemblyBuilder builder)
2069                 {
2070                         if (ResolveBuilder ())
2071                                 builder.SetCustomAttribute (cab);
2072                 }
2073
2074                 public void EmitAttribute (ParameterBuilder builder)
2075                 {
2076                         if (ResolveBuilder ())
2077                                 builder.SetCustomAttribute (cab);
2078                 }
2079
2080                 public bool IsDefined {
2081                         get { return type != null && type != NotFound; }
2082                 }
2083
2084                 public void Initialize (CompilerContext ctx, bool canFail)
2085                 {
2086                         this.compiler = ctx;
2087                         Resolve (canFail);
2088                 }
2089
2090                 public bool Resolve (bool canFail)
2091                 {
2092                         if (type != null) {
2093                                 if (IsDefined)
2094                                         return true;
2095                                 if (canFail)
2096                                         return false;
2097                         }
2098
2099                         type = TypeManager.CoreLookupType (compiler, ns, name, Kind.Class, !canFail);
2100                         if (type == null) {
2101                                 type = NotFound;
2102                                 return false;
2103                         }
2104
2105                         return true;
2106                 }
2107
2108                 bool ResolveBuilder ()
2109                 {
2110                         if (cab != null)
2111                                 return true;
2112
2113                         //
2114                         // Handle all parameter-less attributes as optional
2115                         //
2116                         if (!Resolve (true))
2117                                 return false;
2118
2119                         ConstructorInfo ci = TypeManager.GetPredefinedConstructor (type, Location.Null, Type.EmptyTypes);
2120                         if (ci == null)
2121                                 return false;
2122
2123                         cab = new CustomAttributeBuilder (ci, new object[0]);
2124                         return true;
2125                 }
2126
2127                 public bool ResolveConstructor (Location loc, params Type[] argType)
2128                 {
2129                         if (ctor != null)
2130                                 throw new InternalErrorException ("Predefined ctor redefined");
2131
2132                         if (!Resolve (false))
2133                                 return false;
2134
2135                         ctor = TypeManager.GetPredefinedConstructor (type, loc, argType);
2136                         return ctor != null;
2137                 }
2138
2139                 public Type Type {
2140                         get { return type; }
2141                 }
2142         }
2143 }