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