mcs/mcs/attribute.cs

   1 //
   2 // attribute.cs: Attribute Handler
   3 //
   4 // Author: Ravi Pratap (ravi@ximian.com)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Dual licensed under the terms of the MIT X11 or GNU GPL
   8 //
   9 // Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
  10 // Copyright 2003-2008 Novell, Inc.
  11 //
  12
  13 using System;
  14 using System.Collections.Generic;
  15 using System.Runtime.InteropServices;
  16 using System.Runtime.CompilerServices;
  17 using System.Security;
  18 using System.Security.Permissions;
  19 using System.Text;
  20 using System.IO;
  21
  22 #if STATIC
  23 using SecurityType = System.Collections.Generic.List<IKVM.Reflection.Emit.CustomAttributeBuilder>;
  24 using IKVM.Reflection;
  25 using IKVM.Reflection.Emit;
  26 #else
  27 using SecurityType = System.Collections.Generic.Dictionary<System.Security.Permissions.SecurityAction, System.Security.PermissionSet>;
  28 using System.Reflection;
  29 using System.Reflection.Emit;
  30 #endif
  31
  32 namespace Mono.CSharp {
  33
  34         /// <summary>
  35         ///   Base class for objects that can have Attributes applied to them.
  36         /// </summary>
  37         public abstract class Attributable {
  38                 //
  39                 // Holds all attributes attached to this element
  40                 //
  41                 protected Attributes attributes;
  42
  43                 public void AddAttributes (Attributes attrs, IMemberContext context)
  44                 {
  45                         if (attrs == null)
  46                                 return;
  47
  48                         if (attributes == null)
  49                                 attributes = attrs;
  50                         else
  51                                 throw new NotImplementedException ();
  52
  53                         attributes.AttachTo (this, context);
  54                 }
  55
  56                 public Attributes OptAttributes {
  57                         get {
  58                                 return attributes;
  59                         }
  60                         set {
  61                                 attributes = value;
  62                         }
  63                 }
  64
  65                 /// <summary>
  66                 /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
  67                 /// </summary>
  68                 public abstract void ApplyAttributeBuilder (Attribute a, MethodSpec ctor, byte[] cdata, PredefinedAttributes pa);
  69
  70                 /// <summary>
  71                 /// Returns one AttributeTarget for this element.
  72                 /// </summary>
  73                 public abstract AttributeTargets AttributeTargets { get; }
  74
  75                 public abstract bool IsClsComplianceRequired ();
  76
  77                 /// <summary>
  78                 /// Gets list of valid attribute targets for explicit target declaration.
  79                 /// The first array item is default target. Don't break this rule.
  80                 /// </summary>
  81                 public abstract string[] ValidAttributeTargets { get; }
  82         };
  83
  84         public class Attribute : Expression
  85         {
  86                 public readonly string ExplicitTarget;
  87                 public AttributeTargets Target;
  88                 readonly ATypeNameExpression expression;
  89
  90                 Arguments PosArguments;
  91                 Arguments NamedArguments;
  92
  93                 bool resolve_error;
  94                 bool arg_resolved;
  95                 readonly bool nameEscaped;
  96
  97                 //
  98                 // An attribute can be attached to multiple targets (e.g. multiple fields)
  99                 //
 100                 protected Attributable[] targets;
 101
 102                 //
 103                 // A member context for the attribute, it's much easier to hold it here
 104                 // than trying to pull it during resolve
 105                 //
 106                 IMemberContext context;
 107
 108                 public static readonly AttributeUsageAttribute DefaultUsageAttribute = new AttributeUsageAttribute (AttributeTargets.All);
 109                 static Assembly orig_sec_assembly;
 110                 public static readonly object[] EmptyObject = new object [0];
 111
 112                 List<KeyValuePair<MemberExpr, NamedArgument>> named_values;
 113
 114                 // Cache for parameter-less attributes
 115                 static Dictionary<TypeSpec, MethodSpec> att_cache;
 116
 117                 public Attribute (string target, ATypeNameExpression expr, Arguments[] args, Location loc, bool nameEscaped)
 118                 {
 119                         this.expression = expr;
 120                         if (args != null) {
 121                                 PosArguments = args [0];
 122                                 NamedArguments = args [1];
 123                         }
 124                         this.loc = loc;
 125                         ExplicitTarget = target;
 126                         this.nameEscaped = nameEscaped;
 127                 }
 128
 129                 void AddModuleCharSet (ResolveContext rc)
 130                 {
 131                         const string dll_import_char_set = "CharSet";
 132
 133                         //
 134                         // Only when not customized by user
 135                         //
 136                         if (HasField (dll_import_char_set))
 137                                 return;
 138
 139                         if (!rc.Module.PredefinedTypes.CharSet.IsDefined) {
 140                                 return;
 141                         }
 142
 143                         if (NamedArguments == null)
 144                                 NamedArguments = new Arguments (1);
 145
 146                         var value = Constant.CreateConstant (rc, rc.Module.PredefinedTypes.CharSet.TypeSpec, rc.Module.DefaultCharSet, Location);
 147                         NamedArguments.Add (new NamedArgument (dll_import_char_set, loc, value));
 148                 }
 149
 150                 public Attribute Clone ()
 151                 {
 152                         Attribute a = new Attribute (ExplicitTarget, expression, null, loc, nameEscaped);
 153                         a.PosArguments = PosArguments;
 154                         a.NamedArguments = NamedArguments;
 155                         return a;
 156                 }
 157
 158                 static Attribute ()
 159                 {
 160                         Reset ();
 161                 }
 162
 163                 public static void Reset ()
 164                 {
 165                         att_cache = new Dictionary<TypeSpec, MethodSpec> ();
 166                 }
 167
 168                 //
 169                 // When the same attribute is attached to multiple fiels
 170                 // we use @target field as a list of targets. The attribute
 171                 // has to be resolved only once but emitted for each target.
 172                 //
 173                 public void AttachTo (Attributable target, IMemberContext context)
 174                 {
 175                         if (this.targets == null) {
 176                                 this.targets = new Attributable[] { target };
 177                                 this.context = context;
 178                                 return;
 179                         }
 180
 181                         // Resize target array
 182                         Attributable[] new_array = new Attributable [this.targets.Length + 1];
 183                         targets.CopyTo (new_array, 0);
 184                         new_array [targets.Length] = target;
 185                         this.targets = new_array;
 186
 187                         // No need to update context, different targets cannot have
 188                         // different contexts, it's enough to remove same attributes
 189                         // from secondary members.
 190
 191                         target.OptAttributes = null;
 192                 }
 193
 194                 public ResolveContext CreateResolveContext ()
 195                 {
 196                         return new ResolveContext (context, ResolveContext.Options.ConstantScope);
 197                 }
 198
 199                 static void Error_InvalidNamedArgument (ResolveContext rc, NamedArgument name)
 200                 {
 201                         rc.Report.Error (617, name.Location, "`{0}' is not a valid named attribute argument. Named attribute arguments " +
 202                                       "must be fields which are not readonly, static, const or read-write properties which are " +
 203                                       "public and not static",
 204                               name.Name);
 205                 }
 206
 207                 static void Error_InvalidNamedArgumentType (ResolveContext rc, NamedArgument name)
 208                 {
 209                         rc.Report.Error (655, name.Location,
 210                                 "`{0}' is not a valid named attribute argument because it is not a valid attribute parameter type",
 211                                 name.Name);
 212                 }
 213
 214                 public static void Error_AttributeArgumentIsDynamic (IMemberContext context, Location loc)
 215                 {
 216                         context.Module.Compiler.Report.Error (1982, loc, "An attribute argument cannot be dynamic expression");
 217                 }
 218
 219                 public void Error_MissingGuidAttribute ()
 220                 {
 221                         Report.Error (596, Location, "The Guid attribute must be specified with the ComImport attribute");
 222                 }
 223
 224                 public void Error_MisusedExtensionAttribute ()
 225                 {
 226                         Report.Error (1112, Location, "Do not use `{0}' directly. Use parameter modifier `this' instead", GetSignatureForError ());
 227                 }
 228
 229                 public void Error_MisusedDynamicAttribute ()
 230                 {
 231                         Report.Error (1970, loc, "Do not use `{0}' directly. Use `dynamic' keyword instead", GetSignatureForError ());
 232                 }
 233
 234                 /// <summary>
 235                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 236                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 237                 /// </summary>
 238                 public void Error_AttributeEmitError (string inner)
 239                 {
 240                         Report.Error (647, Location, "Error during emitting `{0}' attribute. The reason is `{1}'",
 241                                       TypeManager.CSharpName (Type), inner);
 242                 }
 243
 244                 public void Error_InvalidSecurityParent ()
 245                 {
 246                         Error_AttributeEmitError ("it is attached to invalid parent");
 247                 }
 248
 249                 Attributable Owner {
 250                         get {
 251                                 return targets [0];
 252                         }
 253                 }
 254
 255                 protected virtual TypeExpr ResolveAsTypeTerminal (Expression expr, IMemberContext ec)
 256                 {
 257                         return expr.ResolveAsTypeTerminal (ec, false);
 258                 }
 259
 260                 TypeSpec ResolvePossibleAttributeType (ATypeNameExpression expr, ref bool is_attr)
 261                 {
 262                         TypeExpr te = ResolveAsTypeTerminal (expr, context);
 263                         if (te == null)
 264                                 return null;
 265
 266                         TypeSpec t = te.Type;
 267                         if (t.IsAttribute) {
 268                                 is_attr = true;
 269                         } else {
 270                                 Report.SymbolRelatedToPreviousError (t);
 271                                 Report.Error (616, Location, "`{0}': is not an attribute class", TypeManager.CSharpName (t));
 272                         }
 273                         return t;
 274                 }
 275
 276                 /// <summary>
 277                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 278                 /// </summary>
 279                 void ResolveAttributeType ()
 280                 {
 281                         SessionReportPrinter resolve_printer = new SessionReportPrinter ();
 282                         ReportPrinter prev_recorder = context.Module.Compiler.Report.SetPrinter (resolve_printer);
 283
 284                         bool t1_is_attr = false;
 285                         bool t2_is_attr = false;
 286                         TypeSpec t1, t2;
 287                         ATypeNameExpression expanded = null;
 288
 289                         try {
 290                                 t1 = ResolvePossibleAttributeType (expression, ref t1_is_attr);
 291
 292                                 if (nameEscaped) {
 293                                         t2 = null;
 294                                 } else {
 295                                         expanded = (ATypeNameExpression) expression.Clone (null);
 296                                         expanded.Name += "Attribute";
 297
 298                                         t2 = ResolvePossibleAttributeType (expanded, ref t2_is_attr);
 299                                 }
 300
 301                                 resolve_printer.EndSession ();
 302                         } finally {
 303                                 context.Module.Compiler.Report.SetPrinter (prev_recorder);
 304                         }
 305
 306                         if (t1_is_attr && t2_is_attr) {
 307                                 Report.Error (1614, Location, "`{0}' is ambiguous between `{1}' and `{2}'. Use either `@{0}' or `{0}Attribute'",
 308                                         GetSignatureForError (), expression.GetSignatureForError (), expanded.GetSignatureForError ());
 309                                 resolve_error = true;
 310                                 return;
 311                         }
 312
 313                         if (t1_is_attr) {
 314                                 Type = t1;
 315                                 return;
 316                         }
 317
 318                         if (t2_is_attr) {
 319                                 Type = t2;
 320                                 return;
 321                         }
 322
 323                         resolve_printer.Merge (prev_recorder);
 324                         resolve_error = true;
 325                 }
 326
 327                 public virtual TypeSpec ResolveType ()
 328                 {
 329                         if (Type == null && !resolve_error)
 330                                 ResolveAttributeType ();
 331                         return Type;
 332                 }
 333
 334                 public override string GetSignatureForError ()
 335                 {
 336                         if (Type != null)
 337                                 return TypeManager.CSharpName (Type);
 338
 339                         return expression.GetSignatureForError ();
 340                 }
 341
 342                 public bool HasSecurityAttribute {
 343                         get {
 344                                 PredefinedAttribute pa = context.Module.PredefinedAttributes.Security;
 345                                 return pa.IsDefined && TypeSpec.IsBaseClass (type, pa.TypeSpec, false);
 346                         }
 347                 }
 348
 349                 public bool IsValidSecurityAttribute ()
 350                 {
 351                         return HasSecurityAttribute && IsSecurityActionValid (false);
 352                 }
 353
 354                 static bool IsValidArgumentType (TypeSpec t)
 355                 {
 356                         if (t.IsArray)
 357                                 t = TypeManager.GetElementType (t);
 358
 359                         return t == TypeManager.string_type ||
 360                                 TypeManager.IsPrimitiveType (t) ||
 361                                 TypeManager.IsEnumType (t) ||
 362                                 t == TypeManager.object_type ||
 363                                 t == TypeManager.type_type;
 364                 }
 365
 366                 // TODO: Don't use this ambiguous value
 367                 public string Name {
 368                         get { return expression.Name; }
 369                 }
 370
 371                 public Report Report {
 372                         get { return context.Module.Compiler.Report; }
 373                 }
 374
 375                 public MethodSpec Resolve ()
 376                 {
 377                         if (resolve_error)
 378                                 return null;
 379
 380                         resolve_error = true;
 381                         arg_resolved = true;
 382
 383                         if (Type == null) {
 384                                 ResolveAttributeType ();
 385                                 if (Type == null)
 386                                         return null;
 387                         }
 388
 389                         if (Type.IsAbstract) {
 390                                 Report.Error (653, Location, "Cannot apply attribute class `{0}' because it is abstract", GetSignatureForError ());
 391                                 return null;
 392                         }
 393
 394                         ObsoleteAttribute obsolete_attr = Type.GetAttributeObsolete ();
 395                         if (obsolete_attr != null) {
 396                                 AttributeTester.Report_ObsoleteMessage (obsolete_attr, TypeManager.CSharpName (Type), Location, Report);
 397                         }
 398
 399                         MethodSpec ctor;
 400                         // Try if the attribute is simple has been resolved before
 401                         if (PosArguments == null && NamedArguments == null) {
 402                                 if (att_cache.TryGetValue (Type, out ctor)) {
 403                                         resolve_error = false;
 404                                         return ctor;
 405                                 }
 406                         }
 407
 408                         ResolveContext rc = CreateResolveContext ();
 409                         ctor = ResolveConstructor (rc);
 410                         if (ctor == null) {
 411                                 return null;
 412                         }
 413
 414                         //
 415                         // Add [module: DefaultCharSet] to all DllImport import attributes
 416                         //
 417                         var module = context.Module;
 418                         if (Type == module.PredefinedAttributes.DllImport && module.HasDefaultCharSet) {
 419                                 AddModuleCharSet (rc);
 420                         }
 421
 422                         if (NamedArguments != null && !ResolveNamedArguments (rc)) {
 423                                 return null;
 424                         }
 425
 426                         resolve_error = false;
 427                         return ctor;
 428                 }
 429
 430                 protected virtual MethodSpec ResolveConstructor (ResolveContext ec)
 431                 {
 432                         if (PosArguments != null) {
 433                                 bool dynamic;
 434                                 PosArguments.Resolve (ec, out dynamic);
 435                                 if (dynamic) {
 436                                         Error_AttributeArgumentIsDynamic (ec.MemberContext, loc);
 437                                         return null;
 438                                 }
 439                         }
 440
 441                         return ConstructorLookup (ec, Type, ref PosArguments, loc);
 442                 }
 443
 444                 protected virtual bool ResolveNamedArguments (ResolveContext ec)
 445                 {
 446                         int named_arg_count = NamedArguments.Count;
 447                         var seen_names = new List<string> (named_arg_count);
 448
 449                         named_values = new List<KeyValuePair<MemberExpr, NamedArgument>> (named_arg_count);
 450
 451                         foreach (NamedArgument a in NamedArguments) {
 452                                 string name = a.Name;
 453                                 if (seen_names.Contains (name)) {
 454                                         ec.Report.Error (643, a.Location, "Duplicate named attribute `{0}' argument", name);
 455                                         continue;
 456                                 }
 457
 458                                 seen_names.Add (name);
 459
 460                                 a.Resolve (ec);
 461
 462                                 Expression member = Expression.MemberLookup (ec, ec.CurrentType, Type, name, 0, MemberLookupRestrictions.ExactArity, loc);
 463
 464                                 if (member == null) {
 465                                         member = Expression.MemberLookup (null, ec.CurrentType, Type, name, 0, MemberLookupRestrictions.ExactArity, loc);
 466
 467                                         if (member != null) {
 468                                                 // TODO: ec.Report.SymbolRelatedToPreviousError (member);
 469                                                 Expression.ErrorIsInaccesible (ec, member.GetSignatureForError (), loc);
 470                                                 return false;
 471                                         }
 472                                 }
 473
 474                                 if (member == null){
 475                                         Expression.Error_TypeDoesNotContainDefinition (ec, Location, Type, name);
 476                                         return false;
 477                                 }
 478
 479                                 if (!(member is PropertyExpr || member is FieldExpr)) {
 480                                         Error_InvalidNamedArgument (ec, a);
 481                                         return false;
 482                                 }
 483
 484                                 ObsoleteAttribute obsolete_attr;
 485
 486                                 if (member is PropertyExpr) {
 487                                         var pi = ((PropertyExpr) member).PropertyInfo;
 488
 489                                         if (!pi.HasSet || !pi.HasGet || pi.IsStatic || !pi.Get.IsPublic || !pi.Set.IsPublic) {
 490                                                 ec.Report.SymbolRelatedToPreviousError (pi);
 491                                                 Error_InvalidNamedArgument (ec, a);
 492                                                 return false;
 493                                         }
 494
 495                                         if (!IsValidArgumentType (member.Type)) {
 496                                                 ec.Report.SymbolRelatedToPreviousError (pi);
 497                                                 Error_InvalidNamedArgumentType (ec, a);
 498                                                 return false;
 499                                         }
 500
 501                                         obsolete_attr = pi.GetAttributeObsolete ();
 502                                         pi.MemberDefinition.SetIsAssigned ();
 503                                 } else {
 504                                         var fi = ((FieldExpr) member).Spec;
 505
 506                                         if (fi.IsReadOnly || fi.IsStatic || !fi.IsPublic) {
 507                                                 Error_InvalidNamedArgument (ec, a);
 508                                                 return false;
 509                                         }
 510
 511                                         if (!IsValidArgumentType (member.Type)) {
 512                                                 ec.Report.SymbolRelatedToPreviousError (fi);
 513                                                 Error_InvalidNamedArgumentType (ec, a);
 514                                                 return false;
 515                                         }
 516
 517                                         obsolete_attr = fi.GetAttributeObsolete ();
 518                                         fi.MemberDefinition.SetIsAssigned ();
 519                                 }
 520
 521                                 if (obsolete_attr != null && !context.IsObsolete)
 522                                         AttributeTester.Report_ObsoleteMessage (obsolete_attr, member.GetSignatureForError (), member.Location, Report);
 523
 524                                 if (a.Type != member.Type) {
 525                                         a.Expr = Convert.ImplicitConversionRequired (ec, a.Expr, member.Type, a.Expr.Location);
 526                                 }
 527
 528                                 if (a.Expr != null)
 529                                         named_values.Add (new KeyValuePair<MemberExpr, NamedArgument> ((MemberExpr) member, a));
 530                         }
 531
 532                         return true;
 533                 }
 534
 535                 /// <summary>
 536                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 537                 /// </summary>
 538                 public string GetValidTargets ()
 539                 {
 540                         StringBuilder sb = new StringBuilder ();
 541                         AttributeTargets targets = Type.GetAttributeUsage (context.Module.PredefinedAttributes.AttributeUsage).ValidOn;
 542
 543                         if ((targets & AttributeTargets.Assembly) != 0)
 544                                 sb.Append ("assembly, ");
 545
 546                         if ((targets & AttributeTargets.Module) != 0)
 547                                 sb.Append ("module, ");
 548
 549                         if ((targets & AttributeTargets.Class) != 0)
 550                                 sb.Append ("class, ");
 551
 552                         if ((targets & AttributeTargets.Struct) != 0)
 553                                 sb.Append ("struct, ");
 554
 555                         if ((targets & AttributeTargets.Enum) != 0)
 556                                 sb.Append ("enum, ");
 557
 558                         if ((targets & AttributeTargets.Constructor) != 0)
 559                                 sb.Append ("constructor, ");
 560
 561                         if ((targets & AttributeTargets.Method) != 0)
 562                                 sb.Append ("method, ");
 563
 564                         if ((targets & AttributeTargets.Property) != 0)
 565                                 sb.Append ("property, indexer, ");
 566
 567                         if ((targets & AttributeTargets.Field) != 0)
 568                                 sb.Append ("field, ");
 569
 570                         if ((targets & AttributeTargets.Event) != 0)
 571                                 sb.Append ("event, ");
 572
 573                         if ((targets & AttributeTargets.Interface) != 0)
 574                                 sb.Append ("interface, ");
 575
 576                         if ((targets & AttributeTargets.Parameter) != 0)
 577                                 sb.Append ("parameter, ");
 578
 579                         if ((targets & AttributeTargets.Delegate) != 0)
 580                                 sb.Append ("delegate, ");
 581
 582                         if ((targets & AttributeTargets.ReturnValue) != 0)
 583                                 sb.Append ("return, ");
 584
 585                         if ((targets & AttributeTargets.GenericParameter) != 0)
 586                                 sb.Append ("type parameter, ");
 587
 588                         return sb.Remove (sb.Length - 2, 2).ToString ();
 589                 }
 590
 591                 public AttributeUsageAttribute GetAttributeUsageAttribute ()
 592                 {
 593                         if (!arg_resolved)
 594                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 595                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 596                                 Resolve ();
 597
 598                         if (resolve_error)
 599                                 return DefaultUsageAttribute;
 600
 601                         AttributeUsageAttribute usage_attribute = new AttributeUsageAttribute ((AttributeTargets)((Constant) PosArguments [0].Expr).GetValue ());
 602
 603                         var field = GetNamedValue ("AllowMultiple") as BoolConstant;
 604                         if (field != null)
 605                                 usage_attribute.AllowMultiple = field.Value;
 606
 607                         field = GetNamedValue ("Inherited") as BoolConstant;
 608                         if (field != null)
 609                                 usage_attribute.Inherited = field.Value;
 610
 611                         return usage_attribute;
 612                 }
 613
 614                 /// <summary>
 615                 /// Returns custom name of indexer
 616                 /// </summary>
 617                 public string GetIndexerAttributeValue ()
 618                 {
 619                         if (!arg_resolved)
 620                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 621                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 622                                 Resolve ();
 623
 624                         if (resolve_error)
 625                                 return null;
 626
 627                         return ((Constant) PosArguments [0].Expr).GetValue () as string;
 628                 }
 629
 630                 /// <summary>
 631                 /// Returns condition of ConditionalAttribute
 632                 /// </summary>
 633                 public string GetConditionalAttributeValue ()
 634                 {
 635                         if (!arg_resolved)
 636                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 637                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 638                                 Resolve ();
 639
 640                         if (resolve_error)
 641                                 return null;
 642
 643                         return ((Constant) PosArguments[0].Expr).GetValue () as string;
 644                 }
 645
 646                 /// <summary>
 647                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 648                 /// </summary>
 649                 public ObsoleteAttribute GetObsoleteAttribute ()
 650                 {
 651                         if (!arg_resolved) {
 652                                 // corlib only case when obsolete is used before is resolved
 653                                 var c = type.MemberDefinition as Class;
 654                                 if (c != null && !c.HasMembersDefined)
 655                                         c.Define ();
 656
 657                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 658                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 659                                 Resolve ();
 660                         }
 661
 662                         if (resolve_error)
 663                                 return null;
 664
 665                         if (PosArguments == null)
 666                                 return new ObsoleteAttribute ();
 667
 668                         string msg = ((Constant) PosArguments[0].Expr).GetValue () as string;
 669                         if (PosArguments.Count == 1)
 670                                 return new ObsoleteAttribute (msg);
 671
 672                         return new ObsoleteAttribute (msg, ((BoolConstant) PosArguments[1].Expr).Value);
 673                 }
 674
 675                 /// <summary>
 676                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 677                 /// before ApplyAttribute. We need to resolve the arguments.
 678                 /// This situation occurs when class deps is differs from Emit order.
 679                 /// </summary>
 680                 public bool GetClsCompliantAttributeValue ()
 681                 {
 682                         if (!arg_resolved)
 683                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 684                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 685                                 Resolve ();
 686
 687                         if (resolve_error)
 688                                 return false;
 689
 690                         return ((BoolConstant) PosArguments[0].Expr).Value;
 691                 }
 692
 693                 public TypeSpec GetCoClassAttributeValue ()
 694                 {
 695                         if (!arg_resolved)
 696                                 Resolve ();
 697
 698                         if (resolve_error)
 699                                 return null;
 700
 701                         return GetArgumentType ();
 702                 }
 703
 704                 public bool CheckTarget ()
 705                 {
 706                         string[] valid_targets = Owner.ValidAttributeTargets;
 707                         if (ExplicitTarget == null || ExplicitTarget == valid_targets [0]) {
 708                                 Target = Owner.AttributeTargets;
 709                                 return true;
 710                         }
 711
 712                         // TODO: we can skip the first item
 713                         if (Array.Exists (valid_targets, i => i == ExplicitTarget)) {
 714                                 switch (ExplicitTarget) {
 715                                 case "return": Target = AttributeTargets.ReturnValue; return true;
 716                                 case "param": Target = AttributeTargets.Parameter; return true;
 717                                 case "field": Target = AttributeTargets.Field; return true;
 718                                 case "method": Target = AttributeTargets.Method; return true;
 719                                 case "property": Target = AttributeTargets.Property; return true;
 720                                 case "module": Target = AttributeTargets.Module; return true;
 721                                 }
 722                                 throw new InternalErrorException ("Unknown explicit target: " + ExplicitTarget);
 723                         }
 724
 725                         StringBuilder sb = new StringBuilder ();
 726                         foreach (string s in valid_targets) {
 727                                 sb.Append (s);
 728                                 sb.Append (", ");
 729                         }
 730                         sb.Remove (sb.Length - 2, 2);
 731                         Report.Error (657, Location, "`{0}' is not a valid attribute location for this declaration. " +
 732                                 "Valid attribute locations for this declaration are `{1}'", ExplicitTarget, sb.ToString ());
 733                         return false;
 734                 }
 735
 736                 /// <summary>
 737                 /// Tests permitted SecurityAction for assembly or other types
 738                 /// </summary>
 739                 protected virtual bool IsSecurityActionValid (bool for_assembly)
 740                 {
 741                         SecurityAction action = GetSecurityActionValue ();
 742
 743                         switch (action) {
 744 #pragma warning disable 618
 745                         case SecurityAction.Demand:
 746                         case SecurityAction.Assert:
 747                         case SecurityAction.Deny:
 748                         case SecurityAction.PermitOnly:
 749                         case SecurityAction.LinkDemand:
 750                         case SecurityAction.InheritanceDemand:
 751                                 if (!for_assembly)
 752                                         return true;
 753                                 break;
 754
 755                         case SecurityAction.RequestMinimum:
 756                         case SecurityAction.RequestOptional:
 757                         case SecurityAction.RequestRefuse:
 758                                 if (for_assembly)
 759                                         return true;
 760                                 break;
 761 #pragma warning restore 618
 762
 763                         default:
 764                                 Error_AttributeEmitError ("SecurityAction is out of range");
 765                                 return false;
 766                         }
 767
 768                         Error_AttributeEmitError (String.Concat ("SecurityAction `", action, "' is not valid for this declaration"));
 769                         return false;
 770                 }
 771
 772                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 773                 {
 774                         return (SecurityAction) ((Constant) PosArguments[0].Expr).GetValue ();
 775                 }
 776
 777                 /// <summary>
 778                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 779                 /// </summary>
 780                 /// <returns></returns>
 781                 public void ExtractSecurityPermissionSet (MethodSpec ctor, ref SecurityType permissions)
 782                 {
 783 #if STATIC
 784                         object[] values = new object [PosArguments.Count];
 785                         for (int i = 0; i < values.Length; ++i)
 786                                 values [i] = ((Constant) PosArguments [i].Expr).GetValue ();
 787
 788                         PropertyInfo[] prop;
 789                         object[] prop_values;
 790                         if (named_values == null) {
 791                                 prop = null;
 792                                 prop_values = null;
 793                         } else {
 794                                 prop = new PropertyInfo[named_values.Count];
 795                                 prop_values = new object [named_values.Count];
 796                                 for (int i = 0; i < prop.Length; ++i) {
 797                                         prop [i] = ((PropertyExpr) named_values [i].Key).PropertyInfo.MetaInfo;
 798                                         prop_values [i] = ((Constant) named_values [i].Value.Expr).GetValue ();
 799                                 }
 800                         }
 801
 802                         if (permissions == null)
 803                                 permissions = new SecurityType ();
 804
 805                         var cab = new CustomAttributeBuilder ((ConstructorInfo) ctor.GetMetaInfo (), values, prop, prop_values);
 806                         permissions.Add (cab);
 807 #else
 808                         Type orig_assembly_type = null;
 809
 810                         if (Type.MemberDefinition is TypeContainer) {
 811                                 if (!RootContext.StdLib) {
 812                                         orig_assembly_type = System.Type.GetType (Type.GetMetaInfo ().FullName);
 813                                 } else {
 814                                         string orig_version_path = Environment.GetEnvironmentVariable ("__SECURITY_BOOTSTRAP_DB");
 815                                         if (orig_version_path == null) {
 816                                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 817                                                 return;
 818                                         }
 819
 820                                         if (orig_sec_assembly == null) {
 821                                                 string file = Path.Combine (orig_version_path, Path.GetFileName (RootContext.OutputFile));
 822                                                 orig_sec_assembly = Assembly.LoadFile (file);
 823                                         }
 824
 825                                         orig_assembly_type = orig_sec_assembly.GetType (Type.GetMetaInfo ().FullName, true);
 826                                         if (orig_assembly_type == null) {
 827                                                 Report.Warning (-112, 1, Location, "Self-referenced security attribute `{0}' " +
 828                                                                 "was not found in previous version of assembly");
 829                                                 return;
 830                                         }
 831                                 }
 832                         }
 833
 834                         SecurityAttribute sa;
 835                         object[] args;
 836
 837                         // For all non-selfreferencing security attributes we can avoid all hacks
 838                         if (orig_assembly_type == null) {
 839                                 args = new object[PosArguments.Count];
 840                                 for (int j = 0; j < args.Length; ++j) {
 841                                         args[j] = ((Constant) PosArguments[j].Expr).GetValue ();
 842                                 }
 843
 844                                 sa = (SecurityAttribute) Activator.CreateInstance (Type.GetMetaInfo (), args);
 845
 846                                 if (named_values != null) {
 847                                         for (int i = 0; i < named_values.Count; ++i) {
 848                                                 PropertyInfo pi = ((PropertyExpr) named_values[i].Key).PropertyInfo.MetaInfo;
 849                                                 pi.SetValue (sa, ((Constant) named_values [i].Value.Expr).GetValue (), null);
 850                                         }
 851                                 }
 852                         } else {
 853                                 // HACK: All security attributes have same ctor syntax
 854                                 args = new object[] { GetSecurityActionValue () };
 855                                 sa = (SecurityAttribute) Activator.CreateInstance (orig_assembly_type, args);
 856
 857                                 // All types are from newly created assembly but for invocation with old one we need to convert them
 858                                 if (named_values != null) {
 859                                         for (int i = 0; i < named_values.Count; ++i) {
 860                                                 PropertyInfo emited_pi = ((PropertyExpr) named_values[i].Key).PropertyInfo.MetaInfo;
 861                                                 // FIXME: We are missing return type filter
 862                                                 // TODO: pi can be null
 863                                                 PropertyInfo pi = orig_assembly_type.GetProperty (emited_pi.Name);
 864
 865                                                 pi.SetValue (sa, ((Constant) named_values[i].Value.Expr).GetValue (), null);
 866                                         }
 867                                 }
 868                         }
 869
 870                         IPermission perm;
 871                         perm = sa.CreatePermission ();
 872                         SecurityAction action = (SecurityAction) args [0];
 873
 874                         // IS is correct because for corlib we are using an instance from old corlib
 875                         if (!(perm is System.Security.CodeAccessPermission)) {
 876                                 switch (action) {
 877                                 case SecurityAction.Demand:
 878                                         action = (SecurityAction)13;
 879                                         break;
 880                                 case SecurityAction.LinkDemand:
 881                                         action = (SecurityAction)14;
 882                                         break;
 883                                 case SecurityAction.InheritanceDemand:
 884                                         action = (SecurityAction)15;
 885                                         break;
 886                                 }
 887                         }
 888
 889                         if (permissions == null)
 890                                 permissions = new SecurityType ();
 891
 892                         PermissionSet ps;
 893                         if (!permissions.TryGetValue (action, out ps)) {
 894                                 if (sa is PermissionSetAttribute)
 895                                         ps = new PermissionSet (sa.Unrestricted ? PermissionState.Unrestricted : PermissionState.None);
 896                                 else
 897                                         ps = new PermissionSet (PermissionState.None);
 898
 899                                 permissions.Add (action, ps);
 900                         } else if (!ps.IsUnrestricted () && (sa is PermissionSetAttribute) && sa.Unrestricted) {
 901                                 ps = ps.Union (new PermissionSet (PermissionState.Unrestricted));
 902                                 permissions [action] = ps;
 903                         }
 904                         ps.AddPermission (perm);
 905 #endif
 906                 }
 907
 908                 public Constant GetNamedValue (string name)
 909                 {
 910                         if (named_values == null)
 911                                 return null;
 912
 913                         for (int i = 0; i < named_values.Count; ++i) {
 914                                 if (named_values [i].Value.Name == name)
 915                                         return named_values [i].Value.Expr as Constant;
 916                         }
 917
 918                         return null;
 919                 }
 920
 921                 public CharSet GetCharSetValue ()
 922                 {
 923                         return (CharSet)System.Enum.Parse (typeof (CharSet), ((Constant) PosArguments [0].Expr).GetValue ().ToString ());
 924                 }
 925
 926                 public bool HasField (string fieldName)
 927                 {
 928                         if (named_values == null)
 929                                 return false;
 930
 931                         foreach (var na in named_values) {
 932                                 if (na.Value.Name == fieldName)
 933                                         return true;
 934                         }
 935
 936                         return false;
 937                 }
 938
 939                 //
 940                 // Returns true for MethodImplAttribute with MethodImplOptions.InternalCall value
 941                 //
 942                 public bool IsInternalCall ()
 943                 {
 944                         MethodImplOptions options = 0;
 945                         if (PosArguments.Count == 1) {
 946                                 options = (MethodImplOptions) System.Enum.Parse (typeof (MethodImplOptions), ((Constant) PosArguments[0].Expr).GetValue ().ToString ());
 947                         } else if (HasField ("Value")) {
 948                                 var named = GetNamedValue ("Value");
 949                                 options = (MethodImplOptions) System.Enum.Parse (typeof (MethodImplOptions), named.GetValue ().ToString ());
 950                         }
 951
 952                         return (options & MethodImplOptions.InternalCall) != 0;
 953                 }
 954
 955                 //
 956                 // Returns true for StructLayoutAttribute with LayoutKind.Explicit value
 957                 //
 958                 public bool IsExplicitLayoutKind ()
 959                 {
 960                         if (PosArguments == null || PosArguments.Count != 1)
 961                                 return false;
 962
 963                         var value = (LayoutKind) System.Enum.Parse (typeof (LayoutKind), ((Constant) PosArguments[0].Expr).GetValue ().ToString ());
 964                         return value == LayoutKind.Explicit;
 965                 }
 966
 967                 public Expression GetParameterDefaultValue ()
 968                 {
 969                         if (PosArguments == null)
 970                                 return null;
 971
 972                         return PosArguments[0].Expr;
 973                 }
 974
 975                 public override bool Equals (object obj)
 976                 {
 977                         Attribute a = obj as Attribute;
 978                         if (a == null)
 979                                 return false;
 980
 981                         return Type == a.Type && Target == a.Target;
 982                 }
 983
 984                 public override int GetHashCode ()
 985                 {
 986                         return type.GetHashCode () ^ Target.GetHashCode ();
 987                 }
 988
 989                 /// <summary>
 990                 /// Emit attribute for Attributable symbol
 991                 /// </summary>
 992                 public void Emit (Dictionary<Attribute, List<Attribute>> allEmitted)
 993                 {
 994                         var ctor = Resolve ();
 995                         if (ctor == null)
 996                                 return;
 997
 998                         var predefined = context.Module.PredefinedAttributes;
 999
1000                         AttributeUsageAttribute usage_attr = Type.GetAttributeUsage (predefined.AttributeUsage);
1001                         if ((usage_attr.ValidOn & Target) == 0) {
1002                                 Report.Error (592, Location, "The attribute `{0}' is not valid on this declaration type. " +
1003                                               "It is valid on `{1}' declarations only",
1004                                         GetSignatureForError (), GetValidTargets ());
1005                                 return;
1006                         }
1007
1008                         byte[] cdata;
1009                         if (PosArguments == null && named_values == null) {
1010                                 cdata = AttributeEncoder.Empty;
1011                         } else {
1012                                 AttributeEncoder encoder = new AttributeEncoder ();
1013
1014                                 if (PosArguments != null) {
1015                                         var param_types = ctor.Parameters.Types;
1016                                         for (int j = 0; j < PosArguments.Count; ++j) {
1017                                                 var pt = param_types[j];
1018                                                 var arg_expr = PosArguments[j].Expr;
1019                                                 if (j == 0) {
1020                                                         if (Type == predefined.IndexerName || Type == predefined.Conditional) {
1021                                                                 string v = ((StringConstant) arg_expr).Value;
1022                                                                 if (!Tokenizer.IsValidIdentifier (v) || Tokenizer.IsKeyword (v)) {
1023                                                                         context.Module.Compiler.Report.Error (633, arg_expr.Location,
1024                                                                                 "The argument to the `{0}' attribute must be a valid identifier", GetSignatureForError ());
1025                                                                 }
1026                                                         } else if (Type == predefined.Guid) {
1027                                                                 try {
1028                                                                         string v = ((StringConstant) arg_expr).Value;
1029                                                                         new Guid (v);
1030                                                                 } catch (Exception e) {
1031                                                                         Error_AttributeEmitError (e.Message);
1032                                                                         return;
1033                                                                 }
1034                                                         } else if (Type == predefined.AttributeUsage) {
1035                                                                 int v = ((IntConstant) ((EnumConstant) arg_expr).Child).Value;
1036                                                                 if (v == 0) {
1037                                                                         context.Module.Compiler.Report.Error (591, Location, "Invalid value for argument to `{0}' attribute",
1038                                                                                 "System.AttributeUsage");
1039                                                                 }
1040                                                         } else if (Type == predefined.MarshalAs) {
1041                                                                 if (PosArguments.Count == 1) {
1042                                                                         var u_type = (UnmanagedType) System.Enum.Parse (typeof (UnmanagedType), ((Constant) PosArguments[0].Expr).GetValue ().ToString ());
1043                                                                         if (u_type == UnmanagedType.ByValArray && !(Owner is FieldBase)) {
1044                                                                                 Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
1045                                                                         }
1046                                                                 }
1047                                                         } else if (Type == predefined.DllImport) {
1048                                                                 if (PosArguments.Count == 1) {
1049                                                                         var value = ((Constant) PosArguments[0].Expr).GetValue () as string;
1050                                                                         if (string.IsNullOrEmpty (value))
1051                                                                                 Error_AttributeEmitError ("DllName cannot be empty");
1052                                                                 }
1053                                                         } else if (Type == predefined.MethodImpl && pt == TypeManager.short_type &&
1054                                                                 !System.Enum.IsDefined (typeof (MethodImplOptions), ((Constant) arg_expr).GetValue ().ToString ())) {
1055                                                                 Error_AttributeEmitError ("Incorrect argument value.");
1056                                                                 return;
1057                                                         }
1058                                                 }
1059
1060                                                 arg_expr.EncodeAttributeValue (context, encoder, pt);
1061                                         }
1062                                 }
1063
1064                                 if (named_values != null) {
1065                                         encoder.Encode ((ushort) named_values.Count);
1066                                         foreach (var na in named_values) {
1067                                                 if (na.Key is FieldExpr)
1068                                                         encoder.Encode ((byte) 0x53);
1069                                                 else
1070                                                         encoder.Encode ((byte) 0x54);
1071
1072                                                 encoder.Encode (na.Key.Type);
1073                                                 encoder.Encode (na.Value.Name);
1074                                                 na.Value.Expr.EncodeAttributeValue (context, encoder, na.Key.Type);
1075                                         }
1076                                 } else {
1077                                         encoder.EncodeEmptyNamedArguments ();
1078                                 }
1079
1080                                 cdata = encoder.ToArray ();
1081                         }
1082
1083                         try {
1084                                 foreach (Attributable target in targets)
1085                                         target.ApplyAttributeBuilder (this, ctor, cdata, predefined);
1086                         } catch (Exception e) {
1087                                 Error_AttributeEmitError (e.Message);
1088                                 return;
1089                         }
1090
1091                         if (!usage_attr.AllowMultiple && allEmitted != null) {
1092                                 if (allEmitted.ContainsKey (this)) {
1093                                         var a = allEmitted [this];
1094                                         if (a == null) {
1095                                                 a = new List<Attribute> (2);
1096                                                 allEmitted [this] = a;
1097                                         }
1098                                         a.Add (this);
1099                                 } else {
1100                                         allEmitted.Add (this, null);
1101                                 }
1102                         }
1103
1104                         if (!RootContext.VerifyClsCompliance)
1105                                 return;
1106
1107                         // Here we are testing attribute arguments for array usage (error 3016)
1108                         if (Owner.IsClsComplianceRequired ()) {
1109                                 if (PosArguments != null)
1110                                         PosArguments.CheckArrayAsAttribute (context.Module.Compiler);
1111
1112                                 if (NamedArguments == null)
1113                                         return;
1114
1115                                 NamedArguments.CheckArrayAsAttribute (context.Module.Compiler);
1116                         }
1117                 }
1118
1119                 private Expression GetValue ()
1120                 {
1121                         if (PosArguments == null || PosArguments.Count < 1)
1122                                 return null;
1123
1124                         return PosArguments [0].Expr;
1125                 }
1126
1127                 public string GetString ()
1128                 {
1129                         Expression e = GetValue ();
1130                         if (e is StringConstant)
1131                                 return ((StringConstant)e).Value;
1132                         return null;
1133                 }
1134
1135                 public bool GetBoolean ()
1136                 {
1137                         Expression e = GetValue ();
1138                         if (e is BoolConstant)
1139                                 return ((BoolConstant)e).Value;
1140                         return false;
1141                 }
1142
1143                 public TypeSpec GetArgumentType ()
1144                 {
1145                         TypeOf e = GetValue () as TypeOf;
1146                         if (e == null)
1147                                 return null;
1148                         return e.TypeArgument;
1149                 }
1150
1151                 public override Expression CreateExpressionTree (ResolveContext ec)
1152                 {
1153                         throw new NotSupportedException ("ET");
1154                 }
1155
1156                 protected override Expression DoResolve (ResolveContext ec)
1157                 {
1158                         throw new NotImplementedException ();
1159                 }
1160
1161                 public override void Emit (EmitContext ec)
1162                 {
1163                         throw new NotImplementedException ();
1164                 }
1165         }
1166
1167
1168         /// <summary>
1169         /// For global attributes (assembly, module) we need special handling.
1170         /// Attributes can be located in the several files
1171         /// </summary>
1172         public class GlobalAttribute : Attribute
1173         {
1174                 public readonly NamespaceEntry ns;
1175
1176                 public GlobalAttribute (NamespaceEntry ns, string target, ATypeNameExpression expression,
1177                                         Arguments[] args, Location loc, bool nameEscaped):
1178                         base (target, expression, args, loc, nameEscaped)
1179                 {
1180                         this.ns = ns;
1181                 }
1182
1183                 void Enter ()
1184                 {
1185                         // RootContext.ToplevelTypes has a single NamespaceEntry which gets overwritten
1186                         // each time a new file is parsed.  However, we need to use the NamespaceEntry
1187                         // in effect where the attribute was used.  Since code elsewhere cannot assume
1188                         // that the NamespaceEntry is right, just overwrite it.
1189                         //
1190                         // Precondition: RootContext.ToplevelTypes == null
1191
1192                         if (RootContext.ToplevelTypes.NamespaceEntry != null)
1193                                 throw new InternalErrorException (Location + " non-null NamespaceEntry");
1194
1195                         RootContext.ToplevelTypes.NamespaceEntry = ns;
1196                 }
1197
1198                 protected override bool IsSecurityActionValid (bool for_assembly)
1199                 {
1200                         return base.IsSecurityActionValid (true);
1201                 }
1202
1203                 void Leave ()
1204                 {
1205                         RootContext.ToplevelTypes.NamespaceEntry = null;
1206                 }
1207
1208                 protected override TypeExpr ResolveAsTypeTerminal (Expression expr, IMemberContext ec)
1209                 {
1210                         try {
1211                                 Enter ();
1212                                 return base.ResolveAsTypeTerminal (expr, ec);
1213                         }
1214                         finally {
1215                                 Leave ();
1216                         }
1217                 }
1218
1219                 protected override MethodSpec ResolveConstructor (ResolveContext ec)
1220                 {
1221                         try {
1222                                 Enter ();
1223                                 return base.ResolveConstructor (ec);
1224                         }
1225                         finally {
1226                                 Leave ();
1227                         }
1228                 }
1229
1230                 protected override bool ResolveNamedArguments (ResolveContext ec)
1231                 {
1232                         try {
1233                                 Enter ();
1234                                 return base.ResolveNamedArguments (ec);
1235                         }
1236                         finally {
1237                                 Leave ();
1238                         }
1239                 }
1240         }
1241
1242         public class Attributes {
1243                 public readonly List<Attribute> Attrs;
1244
1245                 public Attributes (Attribute a)
1246                 {
1247                         Attrs = new List<Attribute> ();
1248                         Attrs.Add (a);
1249                 }
1250
1251                 public Attributes (List<Attribute> attrs)
1252                 {
1253                         Attrs = attrs;
1254                 }
1255
1256                 public void AddAttributes (List<Attribute> attrs)
1257                 {
1258                         Attrs.AddRange (attrs);
1259                 }
1260
1261                 public void AttachTo (Attributable attributable, IMemberContext context)
1262                 {
1263                         foreach (Attribute a in Attrs)
1264                                 a.AttachTo (attributable, context);
1265                 }
1266
1267                 public Attributes Clone ()
1268                 {
1269                         var al = new List<Attribute> (Attrs.Count);
1270                         foreach (Attribute a in Attrs)
1271                                 al.Add (a.Clone ());
1272
1273                         return new Attributes (al);
1274                 }
1275
1276                 /// <summary>
1277                 /// Checks whether attribute target is valid for the current element
1278                 /// </summary>
1279                 public bool CheckTargets ()
1280                 {
1281                         foreach (Attribute a in Attrs) {
1282                                 if (!a.CheckTarget ())
1283                                         return false;
1284                         }
1285                         return true;
1286                 }
1287
1288                 public Attribute Search (PredefinedAttribute t)
1289                 {
1290                         return Search (null, t);
1291                 }
1292
1293                 public Attribute Search (string explicitTarget, PredefinedAttribute t)
1294                 {
1295                         foreach (Attribute a in Attrs) {
1296                                 if (explicitTarget != null && a.ExplicitTarget != explicitTarget)
1297                                         continue;
1298
1299                                 if (a.ResolveType () == t)
1300                                         return a;
1301                         }
1302                         return null;
1303                 }
1304
1305                 /// <summary>
1306                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1307                 /// </summary>
1308                 public Attribute[] SearchMulti (PredefinedAttribute t)
1309                 {
1310                         List<Attribute> ar = null;
1311
1312                         foreach (Attribute a in Attrs) {
1313                                 if (a.ResolveType () == t) {
1314                                         if (ar == null)
1315                                                 ar = new List<Attribute> (Attrs.Count);
1316                                         ar.Add (a);
1317                                 }
1318                         }
1319
1320                         return ar == null ? null : ar.ToArray ();
1321                 }
1322
1323                 public void Emit ()
1324                 {
1325                         CheckTargets ();
1326
1327                         Dictionary<Attribute, List<Attribute>> ld = Attrs.Count > 1 ? new Dictionary<Attribute, List<Attribute>> () : null;
1328
1329                         foreach (Attribute a in Attrs)
1330                                 a.Emit (ld);
1331
1332                         if (ld == null || ld.Count == 0)
1333                                 return;
1334
1335                         foreach (var d in ld) {
1336                                 if (d.Value == null)
1337                                         continue;
1338
1339                                 Attribute a = d.Key;
1340
1341                                 foreach (Attribute collision in d.Value)
1342                                         a.Report.SymbolRelatedToPreviousError (collision.Location, "");
1343
1344                                 a.Report.Error (579, a.Location, "The attribute `{0}' cannot be applied multiple times",
1345                                         a.GetSignatureForError ());
1346                         }
1347                 }
1348
1349                 public bool Contains (PredefinedAttribute t)
1350                 {
1351                         return Search (t) != null;
1352                 }
1353         }
1354
1355         public sealed class AttributeEncoder
1356         {
1357                 [Flags]
1358                 public enum EncodedTypeProperties
1359                 {
1360                         None = 0,
1361                         DynamicType = 1,
1362                         TypeParameter = 1 << 1
1363                 }
1364
1365                 public static readonly byte[] Empty;
1366
1367                 byte[] buffer;
1368                 int pos;
1369                 const ushort Version = 1;
1370
1371                 static AttributeEncoder ()
1372                 {
1373                         Empty = new byte[4];
1374                         Empty[0] = (byte) Version;
1375                 }
1376
1377                 public AttributeEncoder ()
1378                 {
1379                         buffer = new byte[32];
1380                         Encode (Version);
1381                 }
1382
1383                 public void Encode (bool value)
1384                 {
1385                         Encode (value ? (byte) 1 : (byte) 0);
1386                 }
1387
1388                 public void Encode (byte value)
1389                 {
1390                         if (pos == buffer.Length)
1391                                 Grow (1);
1392
1393                         buffer [pos++] = value;
1394                 }
1395
1396                 public void Encode (sbyte value)
1397                 {
1398                         Encode ((byte) value);
1399                 }
1400
1401                 public void Encode (short value)
1402                 {
1403                         if (pos + 2 > buffer.Length)
1404                                 Grow (2);
1405
1406                         buffer[pos++] = (byte) value;
1407                         buffer[pos++] = (byte) (value >> 8);
1408                 }
1409
1410                 public void Encode (ushort value)
1411                 {
1412                         Encode ((short) value);
1413                 }
1414
1415                 public void Encode (int value)
1416                 {
1417                         if (pos + 4 > buffer.Length)
1418                                 Grow (4);
1419
1420                         buffer[pos++] = (byte) value;
1421                         buffer[pos++] = (byte) (value >> 8);
1422                         buffer[pos++] = (byte) (value >> 16);
1423                         buffer[pos++] = (byte) (value >> 24);
1424                 }
1425
1426                 public void Encode (uint value)
1427                 {
1428                         Encode ((int) value);
1429                 }
1430
1431                 public void Encode (long value)
1432                 {
1433                         if (pos + 8 > buffer.Length)
1434                                 Grow (8);
1435
1436                         buffer[pos++] = (byte) value;
1437                         buffer[pos++] = (byte) (value >> 8);
1438                         buffer[pos++] = (byte) (value >> 16);
1439                         buffer[pos++] = (byte) (value >> 24);
1440                         buffer[pos++] = (byte) (value >> 32);
1441                         buffer[pos++] = (byte) (value >> 40);
1442                         buffer[pos++] = (byte) (value >> 48);
1443                         buffer[pos++] = (byte) (value >> 56);
1444                 }
1445
1446                 public void Encode (ulong value)
1447                 {
1448                         Encode ((long) value);
1449                 }
1450
1451                 public void Encode (float value)
1452                 {
1453                         Encode (SingleConverter.SingleToInt32Bits (value));
1454                 }
1455
1456                 public void Encode (double value)
1457                 {
1458                         Encode (BitConverter.DoubleToInt64Bits (value));
1459                 }
1460
1461                 public void Encode (string value)
1462                 {
1463                         if (value == null) {
1464                                 Encode ((byte) 0xFF);
1465                                 return;
1466                         }
1467
1468                         var buf = Encoding.UTF8.GetBytes(value);
1469                         WriteCompressedValue (buf.Length);
1470
1471                         if (pos + buf.Length > buffer.Length)
1472                                 Grow (buf.Length);
1473
1474                         Buffer.BlockCopy (buf, 0, buffer, pos, buf.Length);
1475                         pos += buf.Length;
1476                 }
1477
1478                 public EncodedTypeProperties Encode (TypeSpec type)
1479                 {
1480                         if (type == TypeManager.bool_type) {
1481                                 Encode ((byte) 0x02);
1482                         } else if (type == TypeManager.char_type) {
1483                                 Encode ((byte) 0x03);
1484                         } else if (type == TypeManager.sbyte_type) {
1485                                 Encode ((byte) 0x04);
1486                         } else if (type == TypeManager.byte_type) {
1487                                 Encode ((byte) 0x05);
1488                         } else if (type == TypeManager.short_type) {
1489                                 Encode ((byte) 0x06);
1490                         } else if (type == TypeManager.ushort_type) {
1491                                 Encode ((byte) 0x07);
1492                         } else if (type == TypeManager.int32_type) {
1493                                 Encode ((byte) 0x08);
1494                         } else if (type == TypeManager.uint32_type) {
1495                                 Encode ((byte) 0x09);
1496                         } else if (type == TypeManager.int64_type) {
1497                                 Encode ((byte) 0x0A);
1498                         } else if (type == TypeManager.uint64_type) {
1499                                 Encode ((byte) 0x0B);
1500                         } else if (type == TypeManager.float_type) {
1501                                 Encode ((byte) 0x0C);
1502                         } else if (type == TypeManager.double_type) {
1503                                 Encode ((byte) 0x0D);
1504                         } else if (type == TypeManager.string_type) {
1505                                 Encode ((byte) 0x0E);
1506                         } else if (type == TypeManager.type_type) {
1507                                 Encode ((byte) 0x50);
1508                         } else if (type == TypeManager.object_type) {
1509                                 Encode ((byte) 0x51);
1510                         } else if (TypeManager.IsEnumType (type)) {
1511                                 Encode ((byte) 0x55);
1512                                 EncodeTypeName (type);
1513                         } else if (type.IsArray) {
1514                                 Encode ((byte) 0x1D);
1515                                 return Encode (TypeManager.GetElementType (type));
1516                         } else if (type == InternalType.Dynamic) {
1517                                 Encode ((byte) 0x51);
1518                                 return EncodedTypeProperties.DynamicType;
1519                         }
1520
1521                         return EncodedTypeProperties.None;
1522                 }
1523
1524                 public void EncodeTypeName (TypeSpec type)
1525                 {
1526                         var old_type = type.GetMetaInfo ();
1527                         Encode (type.MemberDefinition.IsImported ? old_type.AssemblyQualifiedName : old_type.FullName);
1528                 }
1529
1530                 //
1531                 // Encodes single property named argument per call
1532                 //
1533                 public void EncodeNamedPropertyArgument (PropertySpec property, Constant value)
1534                 {
1535                         Encode ((ushort) 1);    // length
1536                         Encode ((byte) 0x54); // property
1537                         Encode (property.MemberType);
1538                         Encode (property.Name);
1539                         value.EncodeAttributeValue (null, this, property.MemberType);
1540                 }
1541
1542                 //
1543                 // Encodes single field named argument per call
1544                 //
1545                 public void EncodeNamedFieldArgument (FieldSpec field, Constant value)
1546                 {
1547                         Encode ((ushort) 1);    // length
1548                         Encode ((byte) 0x53); // field
1549                         Encode (field.MemberType);
1550                         Encode (field.Name);
1551                         value.EncodeAttributeValue (null, this, field.MemberType);
1552                 }
1553
1554                 public void EncodeNamedArguments<T> (T[] members, Constant[] values) where T : MemberSpec, IInterfaceMemberSpec
1555                 {
1556                         Encode ((ushort) members.Length);
1557
1558                         for (int i = 0; i < members.Length; ++i)
1559                         {
1560                                 var member = members[i];
1561
1562                                 if (member.Kind == MemberKind.Field)
1563                                         Encode ((byte) 0x53);
1564                                 else if (member.Kind == MemberKind.Property)
1565                                         Encode ((byte) 0x54);
1566                                 else
1567                                         throw new NotImplementedException (member.Kind.ToString ());
1568
1569                                 Encode (member.MemberType);
1570                                 Encode (member.Name);
1571                                 values [i].EncodeAttributeValue (null, this, member.MemberType);
1572                         }
1573                 }
1574
1575                 public void EncodeEmptyNamedArguments ()
1576                 {
1577                         Encode ((ushort) 0);
1578                 }
1579
1580                 void Grow (int inc)
1581                 {
1582                         int size = System.Math.Max (pos * 4, pos + inc + 2);
1583                         Array.Resize (ref buffer, size);
1584                 }
1585
1586                 void WriteCompressedValue (int value)
1587                 {
1588                         if (value < 0x80) {
1589                                 Encode ((byte) value);
1590                                 return;
1591                         }
1592
1593                         if (value < 0x4000) {
1594                                 Encode ((byte) (0x80 | (value >> 8)));
1595                                 Encode ((byte) value);
1596                                 return;
1597                         }
1598
1599                         Encode (value);
1600                 }
1601
1602                 public byte[] ToArray ()
1603                 {
1604                         byte[] buf = new byte[pos];
1605                         Array.Copy (buffer, buf, pos);
1606                         return buf;
1607                 }
1608         }
1609
1610
1611         /// <summary>
1612         /// Helper class for attribute verification routine.
1613         /// </summary>
1614         static class AttributeTester
1615         {
1616                 public enum Result {
1617                         Ok,
1618                         RefOutArrayError,
1619                         ArrayArrayError
1620                 }
1621
1622                 /// <summary>
1623                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1624                 /// It tests differing only in ref or out, or in array rank.
1625                 /// </summary>
1626                 public static Result AreOverloadedMethodParamsClsCompliant (AParametersCollection pa, AParametersCollection pb)
1627                 {
1628                         TypeSpec [] types_a = pa.Types;
1629                         TypeSpec [] types_b = pb.Types;
1630                         if (types_a == null || types_b == null)
1631                                 return Result.Ok;
1632
1633                         if (types_a.Length != types_b.Length)
1634                                 return Result.Ok;
1635
1636                         Result result = Result.Ok;
1637                         for (int i = 0; i < types_b.Length; ++i) {
1638                                 TypeSpec aType = types_a [i];
1639                                 TypeSpec bType = types_b [i];
1640
1641                                 var ac_a = aType as ArrayContainer;
1642                                 var ac_b = aType as ArrayContainer;
1643
1644                                 if (ac_a != null && ac_b != null) {
1645                                         if (ac_a.Rank != ac_b.Rank && ac_a.Element == ac_b.Element) {
1646                                                 result = Result.RefOutArrayError;
1647                                                 continue;
1648                                         }
1649
1650                                         if (ac_a.Element.IsArray || ac_b.Element.IsArray) {
1651                                                 result = Result.ArrayArrayError;
1652                                                 continue;
1653                                         }
1654                                 }
1655
1656                                 if (aType != bType)
1657                                         return Result.Ok;
1658
1659                                 const Parameter.Modifier out_ref_mod = (Parameter.Modifier.OUTMASK | Parameter.Modifier.REFMASK);
1660                                 if ((pa.FixedParameters[i].ModFlags & out_ref_mod) != (pb.FixedParameters[i].ModFlags & out_ref_mod))
1661                                         result = Result.RefOutArrayError;
1662                         }
1663                         return result;
1664                 }
1665
1666                 /// <summary>
1667                 /// Common method for Obsolete error/warning reporting.
1668                 /// </summary>
1669                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc, Report Report)
1670                 {
1671                         if (oa.IsError) {
1672                                 Report.Error (619, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1673                                 return;
1674                         }
1675
1676                         if (oa.Message == null || oa.Message.Length == 0) {
1677                                 Report.Warning (612, 1, loc, "`{0}' is obsolete", member);
1678                                 return;
1679                         }
1680                         Report.Warning (618, 2, loc, "`{0}' is obsolete: `{1}'", member, oa.Message);
1681                 }
1682         }
1683
1684         //
1685         // Predefined attribute types
1686         //
1687         public class PredefinedAttributes
1688         {
1689                 // Build-in attributes
1690                 public readonly PredefinedAttribute ParamArray;
1691                 public readonly PredefinedAttribute Out;
1692
1693                 // Optional attributes
1694                 public readonly PredefinedAttribute Obsolete;
1695                 public readonly PredefinedAttribute DllImport;
1696                 public readonly PredefinedAttribute MethodImpl;
1697                 public readonly PredefinedAttribute MarshalAs;
1698                 public readonly PredefinedAttribute In;
1699                 public readonly PredefinedAttribute IndexerName;
1700                 public readonly PredefinedAttribute Conditional;
1701                 public readonly PredefinedAttribute CLSCompliant;
1702                 public readonly PredefinedAttribute Security;
1703                 public readonly PredefinedAttribute Required;
1704                 public readonly PredefinedAttribute Guid;
1705                 public readonly PredefinedAttribute AssemblyCulture;
1706                 public readonly PredefinedAttribute AssemblyVersion;
1707                 public readonly PredefinedAttribute AssemblyAlgorithmId;
1708                 public readonly PredefinedAttribute AssemblyFlags;
1709                 public readonly PredefinedAttribute AssemblyFileVersion;
1710                 public readonly PredefinedAttribute ComImport;
1711                 public readonly PredefinedAttribute CoClass;
1712                 public readonly PredefinedAttribute AttributeUsage;
1713                 public readonly PredefinedAttribute DefaultParameterValue;
1714                 public readonly PredefinedAttribute OptionalParameter;
1715                 public readonly PredefinedAttribute UnverifiableCode;
1716
1717                 // New in .NET 2.0
1718                 public readonly PredefinedAttribute DefaultCharset;
1719                 public readonly PredefinedAttribute TypeForwarder;
1720                 public readonly PredefinedAttribute FixedBuffer;
1721                 public readonly PredefinedAttribute CompilerGenerated;
1722                 public readonly PredefinedAttribute InternalsVisibleTo;
1723                 public readonly PredefinedAttribute RuntimeCompatibility;
1724                 public readonly PredefinedAttribute DebuggerHidden;
1725                 public readonly PredefinedAttribute UnsafeValueType;
1726
1727                 // New in .NET 3.5
1728                 public readonly PredefinedAttribute Extension;
1729
1730                 // New in .NET 4.0
1731                 public readonly PredefinedDynamicAttribute Dynamic;
1732
1733                 //
1734                 // Optional types which are used as types and for member lookup
1735                 //
1736                 public readonly PredefinedAttribute DefaultMember;
1737                 public readonly PredefinedDecimalAttribute DecimalConstant;
1738                 public readonly PredefinedAttribute StructLayout;
1739                 public readonly PredefinedAttribute FieldOffset;
1740
1741                 public PredefinedAttributes (ModuleContainer module)
1742                 {
1743                         ParamArray = new PredefinedAttribute (module, "System", "ParamArrayAttribute");
1744                         Out = new PredefinedAttribute (module, "System.Runtime.InteropServices", "OutAttribute");
1745                         ParamArray.Resolve (Location.Null);
1746                         Out.Resolve (Location.Null);
1747
1748                         Obsolete = new PredefinedAttribute (module, "System", "ObsoleteAttribute");
1749                         DllImport = new PredefinedAttribute (module, "System.Runtime.InteropServices", "DllImportAttribute");
1750                         MethodImpl = new PredefinedAttribute (module, "System.Runtime.CompilerServices", "MethodImplAttribute");
1751                         MarshalAs = new PredefinedAttribute (module, "System.Runtime.InteropServices", "MarshalAsAttribute");
1752                         In = new PredefinedAttribute (module, "System.Runtime.InteropServices", "InAttribute");
1753                         IndexerName = new PredefinedAttribute (module, "System.Runtime.CompilerServices", "IndexerNameAttribute");
1754                         Conditional = new PredefinedAttribute (module, "System.Diagnostics", "ConditionalAttribute");
1755                         CLSCompliant = new PredefinedAttribute (module, "System", "CLSCompliantAttribute");
1756                         Security = new PredefinedAttribute (module, "System.Security.Permissions", "SecurityAttribute");
1757                         Required = new PredefinedAttribute (module, "System.Runtime.CompilerServices", "RequiredAttributeAttribute");
1758                         Guid = new PredefinedAttribute (module, "System.Runtime.InteropServices", "GuidAttribute");
1759                         AssemblyCulture = new PredefinedAttribute (module, "System.Reflection", "AssemblyCultureAttribute");
1760                         AssemblyVersion = new PredefinedAttribute (module, "System.Reflection", "AssemblyVersionAttribute");
1761                         AssemblyAlgorithmId = new PredefinedAttribute (module, "System.Reflection", "AssemblyAlgorithmIdAttribute");
1762                         AssemblyFlags = new PredefinedAttribute (module, "System.Reflection", "AssemblyFlagsAttribute");
1763                         AssemblyFileVersion = new PredefinedAttribute (module, "System.Reflection", "AssemblyFileVersionAttribute");
1764                         ComImport = new PredefinedAttribute (module, "System.Runtime.InteropServices", "ComImportAttribute");
1765                         CoClass = new PredefinedAttribute (module, "System.Runtime.InteropServices", "CoClassAttribute");
1766                         AttributeUsage = new PredefinedAttribute (module, "System", "AttributeUsageAttribute");
1767                         DefaultParameterValue = new PredefinedAttribute (module, "System.Runtime.InteropServices", "DefaultParameterValueAttribute");
1768                         OptionalParameter = new PredefinedAttribute (module, "System.Runtime.InteropServices", "OptionalAttribute");
1769                         UnverifiableCode = new PredefinedAttribute (module, "System.Security", "UnverifiableCodeAttribute");
1770
1771                         DefaultCharset = new PredefinedAttribute (module, "System.Runtime.InteropServices", "DefaultCharSetAttribute");
1772                         TypeForwarder = new PredefinedAttribute (module, "System.Runtime.CompilerServices", "TypeForwardedToAttribute");
1773                         FixedBuffer = new PredefinedAttribute (module, "System.Runtime.CompilerServices", "FixedBufferAttribute");
1774                         CompilerGenerated = new PredefinedAttribute (module, "System.Runtime.CompilerServices", "CompilerGeneratedAttribute");
1775                         InternalsVisibleTo = new PredefinedAttribute (module, "System.Runtime.CompilerServices", "InternalsVisibleToAttribute");
1776                         RuntimeCompatibility = new PredefinedAttribute (module, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1777                         DebuggerHidden = new PredefinedAttribute (module, "System.Diagnostics", "DebuggerHiddenAttribute");
1778                         UnsafeValueType = new PredefinedAttribute (module, "System.Runtime.CompilerServices", "UnsafeValueTypeAttribute");
1779
1780                         Extension = new PredefinedAttribute (module, "System.Runtime.CompilerServices", "ExtensionAttribute");
1781
1782                         Dynamic = new PredefinedDynamicAttribute (module, "System.Runtime.CompilerServices", "DynamicAttribute");
1783
1784                         DefaultMember = new PredefinedAttribute (module, "System.Reflection", "DefaultMemberAttribute");
1785                         DecimalConstant = new PredefinedDecimalAttribute (module, "System.Runtime.CompilerServices", "DecimalConstantAttribute");
1786                         StructLayout = new PredefinedAttribute (module, "System.Runtime.InteropServices", "StructLayoutAttribute");
1787                         FieldOffset = new PredefinedAttribute (module, "System.Runtime.InteropServices", "FieldOffsetAttribute");
1788
1789                         // TODO: Should define only attributes which are used for comparison
1790                         const System.Reflection.BindingFlags all_fields = System.Reflection.BindingFlags.Public |
1791                                 System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.DeclaredOnly;
1792
1793                         foreach (var fi in GetType ().GetFields (all_fields)) {
1794                                 ((PredefinedAttribute) fi.GetValue (this)).Define ();
1795                         }
1796                 }
1797         }
1798
1799         public class PredefinedAttribute : PredefinedType
1800         {
1801                 protected MethodSpec ctor;
1802                 List<PropertySpec> properties;
1803
1804                 public PredefinedAttribute (ModuleContainer module, string ns, string name)
1805                         : base (module, MemberKind.Class, ns, name)
1806                 {
1807                 }
1808
1809                 #region Properties
1810
1811                 public MethodSpec Constructor {
1812                         get {
1813                                 return ctor;
1814                         }
1815                 }
1816
1817                 #endregion
1818
1819                 public static bool operator == (TypeSpec type, PredefinedAttribute pa)
1820                 {
1821                         return type == pa.type && pa.type != null;
1822                 }
1823
1824                 public static bool operator != (TypeSpec type, PredefinedAttribute pa)
1825                 {
1826                         return type != pa.type;
1827                 }
1828
1829                 public override int GetHashCode ()
1830                 {
1831                         return base.GetHashCode ();
1832                 }
1833
1834                 public override bool Equals (object obj)
1835                 {
1836                         throw new NotSupportedException ();
1837                 }
1838
1839                 public void EmitAttribute (ConstructorBuilder builder)
1840                 {
1841                         if (ResolveBuilder ())
1842                                 builder.SetCustomAttribute (GetCtorMetaInfo (), AttributeEncoder.Empty);
1843                 }
1844
1845                 public void EmitAttribute (MethodBuilder builder)
1846                 {
1847                         if (ResolveBuilder ())
1848                                 builder.SetCustomAttribute (GetCtorMetaInfo (), AttributeEncoder.Empty);
1849                 }
1850
1851                 public void EmitAttribute (PropertyBuilder builder)
1852                 {
1853                         if (ResolveBuilder ())
1854                                 builder.SetCustomAttribute (GetCtorMetaInfo (), AttributeEncoder.Empty);
1855                 }
1856
1857                 public void EmitAttribute (FieldBuilder builder)
1858                 {
1859                         if (ResolveBuilder ())
1860                                 builder.SetCustomAttribute (GetCtorMetaInfo (), AttributeEncoder.Empty);
1861                 }
1862
1863                 public void EmitAttribute (FieldBuilder builder, AttributeEncoder argsEncoded)
1864                 {
1865                         builder.SetCustomAttribute (GetCtorMetaInfo (), argsEncoded.ToArray ());
1866                 }
1867
1868                 public void EmitAttribute (TypeBuilder builder)
1869                 {
1870                         if (ResolveBuilder ())
1871                                 builder.SetCustomAttribute (GetCtorMetaInfo (), AttributeEncoder.Empty);
1872                 }
1873
1874                 public void EmitAttribute (TypeBuilder builder, AttributeEncoder argsEncoded)
1875                 {
1876                         builder.SetCustomAttribute (GetCtorMetaInfo (), argsEncoded.ToArray ());
1877                 }
1878
1879                 public void EmitAttribute (AssemblyBuilder builder)
1880                 {
1881                         if (ResolveBuilder ())
1882                                 builder.SetCustomAttribute (GetCtorMetaInfo (), AttributeEncoder.Empty);
1883                 }
1884
1885                 public void EmitAttribute (ModuleBuilder builder)
1886                 {
1887                         if (ResolveBuilder ())
1888                                 builder.SetCustomAttribute (GetCtorMetaInfo (), AttributeEncoder.Empty);
1889                 }
1890
1891                 public void EmitAttribute (ParameterBuilder builder)
1892                 {
1893                         if (ResolveBuilder ())
1894                                 builder.SetCustomAttribute (GetCtorMetaInfo (), AttributeEncoder.Empty);
1895                 }
1896
1897                 public void EmitAttribute (ParameterBuilder builder, AttributeEncoder argsEncoded)
1898                 {
1899                         builder.SetCustomAttribute (GetCtorMetaInfo (), argsEncoded.ToArray ());
1900                 }
1901
1902                 ConstructorInfo GetCtorMetaInfo ()
1903                 {
1904                         return (ConstructorInfo) ctor.GetMetaInfo ();
1905                 }
1906
1907                 public PropertySpec GetProperty (string name, TypeSpec memberType, Location loc)
1908                 {
1909                         PropertySpec spec;
1910
1911                         if (properties != null) {
1912                                 spec = properties.Find (l => l.Name == name);
1913                         } else {
1914                                 spec = null;
1915                         }
1916
1917                         if (spec == null) {
1918                                 spec = TypeManager.GetPredefinedProperty (type, name, loc, memberType);
1919
1920                                 if (spec != null) {
1921                                         if (properties == null) {
1922                                                 properties = new List<PropertySpec> ();
1923                                         }
1924
1925                                         properties.Add (spec);
1926                                 }
1927                         }
1928
1929                         return spec;
1930                 }
1931
1932                 public bool ResolveBuilder ()
1933                 {
1934                         if (ctor != null)
1935                                 return true;
1936
1937                         //
1938                         // Handle all parameter-less attributes as optional
1939                         //
1940                         if (!IsDefined)
1941                                 return false;
1942
1943                         ctor = TypeManager.GetPredefinedConstructor (type, Location.Null, TypeSpec.EmptyTypes);
1944                         return ctor != null;
1945                 }
1946
1947                 public bool ResolveConstructor (Location loc, params TypeSpec[] argType)
1948                 {
1949                         if (ctor != null)
1950                                 throw new InternalErrorException ("Predefined ctor redefined");
1951
1952                         if (Resolve (loc) == null)
1953                                 return false;
1954
1955                         ctor = TypeManager.GetPredefinedConstructor (type, loc, argType);
1956                         return ctor != null;
1957                 }
1958         }
1959
1960         public class PredefinedDecimalAttribute : PredefinedAttribute
1961         {
1962                 public PredefinedDecimalAttribute (ModuleContainer module, string ns, string name)
1963                         : base (module, ns, name)
1964                 {
1965                 }
1966
1967                 public void EmitAttribute (ParameterBuilder builder, decimal value, Location loc)
1968                 {
1969                         if (Resolve (loc) == null)
1970                                 return;
1971
1972                         if (ctor == null && !ResolveConstructor (loc, TypeManager.byte_type, TypeManager.byte_type, TypeManager.uint32_type, TypeManager.uint32_type, TypeManager.uint32_type))
1973                                 return;
1974
1975                         int[] bits = decimal.GetBits (value);
1976                         AttributeEncoder encoder = new AttributeEncoder ();
1977                         encoder.Encode ((byte) (bits[3] >> 16));
1978                         encoder.Encode ((byte) (bits[3] >> 31));
1979                         encoder.Encode ((uint) bits[2]);
1980                         encoder.Encode ((uint) bits[1]);
1981                         encoder.Encode ((uint) bits[0]);
1982                         encoder.EncodeEmptyNamedArguments ();
1983
1984                         EmitAttribute (builder, encoder);
1985                 }
1986
1987                 public void EmitAttribute (FieldBuilder builder, decimal value, Location loc)
1988                 {
1989                         if (Resolve (loc) == null)
1990                                 return;
1991
1992                         if (ctor == null && !ResolveConstructor (loc, TypeManager.byte_type, TypeManager.byte_type, TypeManager.uint32_type, TypeManager.uint32_type, TypeManager.uint32_type))
1993                                 return;
1994
1995                         int[] bits = decimal.GetBits (value);
1996                         AttributeEncoder encoder = new AttributeEncoder ();
1997                         encoder.Encode ((byte) (bits[3] >> 16));
1998                         encoder.Encode ((byte) (bits[3] >> 31));
1999                         encoder.Encode ((uint) bits[2]);
2000                         encoder.Encode ((uint) bits[1]);
2001                         encoder.Encode ((uint) bits[0]);
2002                         encoder.EncodeEmptyNamedArguments ();
2003
2004                         EmitAttribute (builder, encoder);
2005                 }
2006         }
2007
2008         public class PredefinedDynamicAttribute : PredefinedAttribute
2009         {
2010                 MethodSpec tctor;
2011
2012                 public PredefinedDynamicAttribute (ModuleContainer module, string ns, string name)
2013                         : base (module, ns, name)
2014                 {
2015                 }
2016
2017                 public void EmitAttribute (FieldBuilder builder, TypeSpec type, Location loc)
2018                 {
2019                         if (ResolveTransformationCtor (loc)) {
2020                                 var cab = new CustomAttributeBuilder ((ConstructorInfo) tctor.GetMetaInfo (), new object[] { GetTransformationFlags (type) });
2021                                 builder.SetCustomAttribute (cab);
2022                         }
2023                 }
2024
2025                 public void EmitAttribute (ParameterBuilder builder, TypeSpec type, Location loc)
2026                 {
2027                         if (ResolveTransformationCtor (loc)) {
2028                                 var cab = new CustomAttributeBuilder ((ConstructorInfo) tctor.GetMetaInfo (), new object[] { GetTransformationFlags (type) });
2029                                 builder.SetCustomAttribute (cab);
2030                         }
2031                 }
2032
2033                 public void EmitAttribute (PropertyBuilder builder, TypeSpec type, Location loc)
2034                 {
2035                         if (ResolveTransformationCtor (loc)) {
2036                                 var cab = new CustomAttributeBuilder ((ConstructorInfo) tctor.GetMetaInfo (), new object[] { GetTransformationFlags (type) });
2037                                 builder.SetCustomAttribute (cab);
2038                         }
2039                 }
2040
2041                 public void EmitAttribute (TypeBuilder builder, TypeSpec type, Location loc)
2042                 {
2043                         if (ResolveTransformationCtor (loc)) {
2044                                 var cab = new CustomAttributeBuilder ((ConstructorInfo) tctor.GetMetaInfo (), new object[] { GetTransformationFlags (type) });
2045                                 builder.SetCustomAttribute (cab);
2046                         }
2047                 }
2048
2049                 //
2050                 // When any element of the type is a dynamic type
2051                 //
2052                 // This method builds a transformation array for dynamic types
2053                 // used in places where DynamicAttribute cannot be applied to.
2054                 // It uses bool flag when type is of dynamic type and each
2055                 // section always starts with "false" for some reason.
2056                 //
2057                 // LAMESPEC: This should be part of C# specification
2058                 //
2059                 // Example: Func<dynamic, int, dynamic[]>
2060                 // Transformation: { false, true, false, false, true }
2061                 //
2062                 static bool[] GetTransformationFlags (TypeSpec t)
2063                 {
2064                         bool[] element;
2065                         var ac = t as ArrayContainer;
2066                         if (ac != null) {
2067                                 element = GetTransformationFlags (ac.Element);
2068                                 if (element == null)
2069                                         return null;
2070
2071                                 bool[] res = new bool[element.Length + 1];
2072                                 res[0] = false;
2073                                 Array.Copy (element, 0, res, 1, element.Length);
2074                                 return res;
2075                         }
2076
2077                         if (t == null)
2078                                 return null;
2079
2080                         if (t.IsGeneric) {
2081                                 List<bool> transform = null;
2082                                 var targs = t.TypeArguments;
2083                                 for (int i = 0; i < targs.Length; ++i) {
2084                                         element = GetTransformationFlags (targs[i]);
2085                                         if (element != null) {
2086                                                 if (transform == null) {
2087                                                         transform = new List<bool> ();
2088                                                         for (int ii = 0; ii <= i; ++ii)
2089                                                                 transform.Add (false);
2090                                                 }
2091
2092                                                 transform.AddRange (element);
2093                                         } else if (transform != null) {
2094                                                 transform.Add (false);
2095                                         }
2096                                 }
2097
2098                                 if (transform != null)
2099                                         return transform.ToArray ();
2100                         }
2101
2102                         if (t == InternalType.Dynamic)
2103                                 return new bool[] { true };
2104
2105                         return null;
2106                 }
2107
2108                 bool ResolveTransformationCtor (Location loc)
2109                 {
2110                         if (tctor != null)
2111                                 return true;
2112
2113                         if (Resolve (loc) == null)
2114                                 return false;
2115
2116                         tctor = TypeManager.GetPredefinedConstructor (type, Location.Null, ArrayContainer.MakeType (TypeManager.bool_type));
2117                         return tctor != null;
2118                 }
2119         }
2120 }