mcs/gmcs/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 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10 //
  11 //
  12
  13 using System;
  14 using System.Diagnostics;
  15 using System.Collections;
  16 using System.Collections.Specialized;
  17 using System.Reflection;
  18 using System.Reflection.Emit;
  19 using System.Runtime.InteropServices;
  20 using System.Runtime.CompilerServices;
  21 using System.Text;
  22
  23 namespace Mono.CSharp {
  24
  25         /// <summary>
  26         ///   Base class for objects that can have Attributes applied to them.
  27         /// </summary>
  28         public abstract class Attributable {
  29                 /// <summary>
  30                 ///   Attributes for this type
  31                 /// </summary>
  32                 Attributes attributes;
  33
  34                 public Attributable(Attributes attrs)
  35                 {
  36                         attributes = attrs;
  37                         if (attributes != null)
  38                                 attributes.CheckTargets (this);
  39                 }
  40
  41                 public Attributes OptAttributes
  42                 {
  43                         get {
  44                                 return attributes;
  45                         }
  46                         set {
  47                                 attributes = value;
  48                                 if (attributes != null)
  49                                         attributes.CheckTargets (this);
  50                         }
  51                 }
  52
  53                 /// <summary>
  54                 /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
  55                 /// </summary>
  56                 public abstract void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb);
  57
  58                 /// <summary>
  59                 /// Returns one AttributeTarget for this element.
  60                 /// </summary>
  61                 public abstract AttributeTargets AttributeTargets { get; }
  62
  63                 public abstract bool IsClsCompliaceRequired (DeclSpace ds);
  64
  65                 /// <summary>
  66                 /// Gets list of valid attribute targets for explicit target declaration.
  67                 /// The first array item is default target. Don't break this rule.
  68                 /// </summary>
  69                 public abstract string[] ValidAttributeTargets { get; }
  70         };
  71
  72         public class Attribute {
  73                 public readonly string ExplicitTarget;
  74                 public AttributeTargets Target;
  75
  76                 public readonly string    Name;
  77                 public readonly ArrayList Arguments;
  78
  79                 public readonly Location Location;
  80
  81                 public Type Type;
  82
  83                 // Is non-null if type is AttributeUsageAttribute
  84                 AttributeUsageAttribute usage_attribute;
  85
  86                 public AttributeUsageAttribute UsageAttribute {
  87                         get {
  88                                 return usage_attribute;
  89                         }
  90                 }
  91
  92                 MethodImplOptions ImplOptions;
  93                 UnmanagedType     UnmanagedType;
  94                 CustomAttributeBuilder cb;
  95
  96                 // non-null if named args present after Resolve () is called
  97                 PropertyInfo [] prop_info_arr;
  98                 FieldInfo [] field_info_arr;
  99                 object [] field_values_arr;
 100                 object [] prop_values_arr;
 101                 object [] pos_values;
 102
 103                 static PtrHashtable usage_attr_cache = new PtrHashtable ();
 104
 105                 public Attribute (string target, string name, ArrayList args, Location loc)
 106                 {
 107                         Name = name;
 108                         Arguments = args;
 109                         Location = loc;
 110                         ExplicitTarget = target;
 111                 }
 112
 113                 void Error_InvalidNamedArgument (string name)
 114                 {
 115                         Report.Error (617, Location, "'" + name + "' is not a valid named attribute " +
 116                                       "argument. Named attribute arguments must be fields which are not " +
 117                                       "readonly, static or const, or read-write properties which are not static.");
 118                 }
 119
 120                 static void Error_AttributeArgumentNotValid (Location loc)
 121                 {
 122                         Report.Error (182, loc,
 123                                       "An attribute argument must be a constant expression, typeof " +
 124                                       "expression or array creation expression");
 125                 }
 126
 127                 static void Error_TypeParameterInAttribute (Location loc)
 128                 {
 129                         Report.Error (
 130                                 -202, loc, "Can not use a type parameter in an attribute");
 131                 }
 132
 133                 void Error_AttributeConstructorMismatch ()
 134                 {
 135                         Report.Error (-6, Location,
 136                                       "Could not find a constructor for this argument list.");
 137                 }
 138
 139                 /// <summary>
 140                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 141                 /// </summary>
 142                 protected virtual Type CheckAttributeType (EmitContext ec, bool complain)
 143                 {
 144                         TypeExpr t1 = RootContext.LookupType (ec.DeclSpace, Name, true, Location);
 145                         // FIXME: Shouldn't do this for quoted attributes: [@A]
 146                         TypeExpr t2 = RootContext.LookupType (ec.DeclSpace, Name + "Attribute", true, Location);
 147
 148                         String err0616 = null;
 149                         if (t1 != null && ! t1.IsAttribute) {
 150                                 t1 = null;
 151                                 err0616 = "'" + Name + "': is not an attribute class";
 152                         }
 153                         if (t2 != null && ! t2.IsAttribute) {
 154                                 t2 = null;
 155                                 err0616 = (err0616 != null)
 156                                         ? "Neither '" + Name + "' nor '" + Name + "Attribute' is an attribute class"
 157                                         : "'" + Name + "Attribute': is not an attribute class";
 158                         }
 159
 160                         if (t1 != null && t2 != null) {
 161                                 Report.Error(1614, Location, "'" + Name + "': is ambiguous; "
 162                                              + " use either '@" + Name + "' or '" + Name + "Attribute'");
 163                                 return null;
 164                         }
 165                         if (t1 != null)
 166                                 return t1.ResolveType (ec);
 167                         if (t2 != null)
 168                                 return t2.ResolveType (ec);
 169                         if (err0616 != null) {
 170                                 Report.Error (616, Location, err0616);
 171                                 return null;
 172                         }
 173
 174                         if (complain)
 175                                 Report.Error (246, Location,
 176                                               "Could not find attribute '" + Name
 177                                               + "' (are you missing a using directive or an assembly reference ?)");
 178                         return null;
 179                 }
 180
 181                 public Type ResolveType (EmitContext ec, bool complain)
 182                 {
 183                         if (Type == null)
 184                                 Type = CheckAttributeType (ec, complain);
 185                         return Type;
 186                 }
 187
 188                 /// <summary>
 189                 ///   Validates the guid string
 190                 /// </summary>
 191                 bool ValidateGuid (string guid)
 192                 {
 193                         try {
 194                                 new Guid (guid);
 195                                 return true;
 196                         } catch {
 197                                 Report.Error (647, Location, "Format of GUID is invalid: " + guid);
 198                                 return false;
 199                         }
 200                 }
 201
 202                 string GetFullMemberName (string member)
 203                 {
 204                         return Type.FullName + '.' + member;
 205                 }
 206
 207                 //
 208                 // Given an expression, if the expression is a valid attribute-argument-expression
 209                 // returns an object that can be used to encode it, or null on failure.
 210                 //
 211                 public static bool GetAttributeArgumentExpression (Expression e, Location loc, Type arg_type, out object result)
 212                 {
 213                         if (e is EnumConstant) {
 214                                 if (RootContext.StdLib)
 215                                         result = ((EnumConstant)e).GetValueAsEnumType ();
 216                                 else
 217                                         result = ((EnumConstant)e).GetValue ();
 218
 219                                 return true;
 220                         }
 221
 222                         Constant constant = e as Constant;
 223                         if (constant != null) {
 224                                 if (e.Type != arg_type) {
 225                                         constant = Const.ChangeType (loc, constant, arg_type);
 226                                         if (constant == null) {
 227                                                 result = null;
 228                                                 Error_AttributeArgumentNotValid (loc);
 229                                                 return false;
 230                                         }
 231                                 }
 232                                 result = constant.GetValue ();
 233                                 return true;
 234                         } else if (e is TypeOf) {
 235                                 result = ((TypeOf) e).TypeArg;
 236                                 return true;
 237                         } else if (e is ArrayCreation){
 238                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();
 239                                 if (result != null)
 240                                         return true;
 241                         } else if (e is EmptyCast) {
 242                                 Expression child = ((EmptyCast)e).Child;
 243                                 return GetAttributeArgumentExpression (child, loc, child.Type, out result);
 244                         }
 245
 246                         result = null;
 247                         Error_AttributeArgumentNotValid (loc);
 248                         return false;
 249                 }
 250
 251                 public CustomAttributeBuilder Resolve (EmitContext ec)
 252                 {
 253                         Type oldType = Type;
 254
 255                         // Sanity check.
 256                         Type = CheckAttributeType (ec, true);
 257
 258                         if (oldType == null && Type == null)
 259                                 return null;
 260                         if (oldType != null && oldType != Type){
 261                                 Report.Error (-27, Location,
 262                                               "Attribute {0} resolved to different types at different times: {1} vs. {2}",
 263                                               Name, oldType, Type);
 264                                 return null;
 265                         }
 266
 267                         if (Type.IsAbstract) {
 268                                 Report.Error (653, Location, "Cannot apply attribute class '{0}' because it is abstract", Name);
 269                                 return null;
 270                         }
 271
 272                         bool MethodImplAttr = false;
 273                         bool MarshalAsAttr = false;
 274                         bool GuidAttr = false;
 275                         bool usage_attr = false;
 276
 277                         bool DoCompares = true;
 278
 279                         //
 280                         // If we are a certain special attribute, we
 281                         // set the information accordingly
 282                         //
 283
 284                         if (Type == TypeManager.attribute_usage_type)
 285                                 usage_attr = true;
 286                         else if (Type == TypeManager.methodimpl_attr_type)
 287                                 MethodImplAttr = true;
 288                         else if (Type == TypeManager.marshal_as_attr_type)
 289                                 MarshalAsAttr = true;
 290                         else if (Type == TypeManager.guid_attr_type)
 291                                 GuidAttr = true;
 292                         else
 293                                 DoCompares = false;
 294
 295                         // Now we extract the positional and named arguments
 296
 297                         ArrayList pos_args = new ArrayList ();
 298                         ArrayList named_args = new ArrayList ();
 299                         int pos_arg_count = 0;
 300
 301                         if (Arguments != null) {
 302                                 pos_args = (ArrayList) Arguments [0];
 303                                 if (pos_args != null)
 304                                         pos_arg_count = pos_args.Count;
 305                                 if (Arguments.Count > 1)
 306                                         named_args = (ArrayList) Arguments [1];
 307                         }
 308
 309                         pos_values = new object [pos_arg_count];
 310
 311                         //
 312                         // First process positional arguments
 313                         //
 314
 315                         int i;
 316                         for (i = 0; i < pos_arg_count; i++) {
 317                                 Argument a = (Argument) pos_args [i];
 318                                 Expression e;
 319
 320                                 if (!a.Resolve (ec, Location))
 321                                         return null;
 322
 323                                 e = a.Expr;
 324
 325                                 object val;
 326                                 if (!GetAttributeArgumentExpression (e, Location, a.Type, out val))
 327                                         return null;
 328
 329                                 pos_values [i] = val;
 330
 331                                 if (DoCompares){
 332                                         if (usage_attr) {
 333                                                 usage_attribute = new AttributeUsageAttribute ((AttributeTargets)val);
 334                                         } else if (MethodImplAttr) {
 335                                                 this.ImplOptions = (MethodImplOptions) val;
 336                                         } else if (GuidAttr){
 337                                                 //
 338                                                 // we will later check the validity of the type
 339                                                 //
 340                                                 if (val is string){
 341                                                         if (!ValidateGuid ((string) val))
 342                                                                 return null;
 343                                                 }
 344
 345                                         } else if (MarshalAsAttr)
 346                                                 this.UnmanagedType =
 347                                                 (System.Runtime.InteropServices.UnmanagedType) val;
 348                                 }
 349                         }
 350
 351                         //
 352                         // Now process named arguments
 353                         //
 354
 355                         ArrayList field_infos = null;
 356                         ArrayList prop_infos  = null;
 357                         ArrayList field_values = null;
 358                         ArrayList prop_values = null;
 359
 360                         if (named_args.Count > 0) {
 361                                 field_infos = new ArrayList ();
 362                                 prop_infos  = new ArrayList ();
 363                                 field_values = new ArrayList ();
 364                                 prop_values = new ArrayList ();
 365                         }
 366
 367                         Hashtable seen_names = new Hashtable();
 368
 369                         for (i = 0; i < named_args.Count; i++) {
 370                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 371                                 string member_name = (string) de.Key;
 372                                 Argument a  = (Argument) de.Value;
 373                                 Expression e;
 374
 375                                 if (seen_names.Contains(member_name)) {
 376                                         Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
 377                                         return null;
 378                                 }
 379                                 seen_names.Add(member_name, 1);
 380
 381                                 if (!a.Resolve (ec, Location))
 382                                         return null;
 383
 384                                 Expression member = Expression.MemberLookup (
 385                                         ec, Type, member_name,
 386                                         MemberTypes.Field | MemberTypes.Property,
 387                                         BindingFlags.Public | BindingFlags.Instance,
 388                                         Location);
 389
 390                                 if (member == null) {
 391                                         member = Expression.MemberLookup (ec, Type, member_name,
 392                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 393                                                 Location);
 394
 395                                         if (member != null) {
 396                                                 Report.Error (122, Location, "'{0}' is inaccessible due to its protection level", GetFullMemberName (member_name));
 397                                                 return null;
 398                                         }
 399                                 }
 400
 401                                 if (member == null || !(member is PropertyExpr || member is FieldExpr)) {
 402                                         Error_InvalidNamedArgument (member_name);
 403                                         return null;
 404                                 }
 405
 406                                 e = a.Expr;
 407                                 if (e is TypeParameterExpr){
 408                                         Error_TypeParameterInAttribute (Location);
 409                                         return null;
 410                                 }
 411
 412                                 if (member is PropertyExpr) {
 413                                         PropertyExpr pe = (PropertyExpr) member;
 414                                         PropertyInfo pi = pe.PropertyInfo;
 415
 416                                         if (!pi.CanWrite || !pi.CanRead) {
 417                                                 Report.SymbolRelatedToPreviousError (pi);
 418                                                 Error_InvalidNamedArgument (member_name);
 419                                                 return null;
 420                                         }
 421
 422                                         object value;
 423                                         if (!GetAttributeArgumentExpression (e, Location, pi.PropertyType, out value))
 424                                                                 return null;
 425
 426                                                 if (usage_attribute != null) {
 427                                                         if (member_name == "AllowMultiple")
 428                                                         usage_attribute.AllowMultiple = (bool) value;
 429                                                         if (member_name == "Inherited")
 430                                                         usage_attribute.Inherited = (bool) value;
 431                                         }
 432
 433                                         prop_values.Add (value);
 434                                         prop_infos.Add (pi);
 435
 436                                 } else if (member is FieldExpr) {
 437                                         FieldExpr fe = (FieldExpr) member;
 438                                         FieldInfo fi = fe.FieldInfo;
 439
 440                                         if (fi.IsInitOnly) {
 441                                                 Error_InvalidNamedArgument (member_name);
 442                                                 return null;
 443                                         }
 444
 445                                         object value;
 446                                         if (!GetAttributeArgumentExpression (e, Location, fi.FieldType, out value))
 447                                                 return null;
 448
 449                                         field_values.Add (value);
 450
 451                                         field_infos.Add (fi);
 452                                 }
 453                         }
 454
 455                         Expression mg = Expression.MemberLookup (
 456                                 ec, Type, ".ctor", MemberTypes.Constructor,
 457                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 458                                 Location);
 459
 460                         if (mg == null) {
 461                                 Error_AttributeConstructorMismatch ();
 462                                 return null;
 463                         }
 464
 465                         MethodBase constructor = Invocation.OverloadResolve (
 466                                 ec, (MethodGroupExpr) mg, pos_args, false, Location);
 467
 468                         if (constructor == null) {
 469                                 return null;
 470                         }
 471
 472                         //
 473                         // Now we perform some checks on the positional args as they
 474                         // cannot be null for a constructor which expects a parameter
 475                         // of type object
 476                         //
 477
 478                         ParameterData pd = Invocation.GetParameterData (constructor);
 479
 480                         int group_in_params_array = Int32.MaxValue;
 481                         int pc = pd.Count;
 482                         if (pc > 0 && pd.ParameterModifier (pc-1) == Parameter.Modifier.PARAMS)
 483                                 group_in_params_array = pc-1;
 484
 485                         for (int j = 0; j < pos_arg_count; ++j) {
 486                                 Argument a = (Argument) pos_args [j];
 487
 488                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {
 489                                         Error_AttributeArgumentNotValid (Location);
 490                                         return null;
 491                                 }
 492
 493                                 if (j < group_in_params_array)
 494                                         continue;
 495
 496                                 if (j == group_in_params_array){
 497                                         object v = pos_values [j];
 498                                         int count = pos_arg_count - j;
 499
 500                                         object [] array = new object [count];
 501                                         pos_values [j] = array;
 502                                         array [0] = v;
 503                                 } else {
 504                                         object [] array = (object []) pos_values [group_in_params_array];
 505
 506                                         array [j - group_in_params_array] = pos_values [j];
 507                                 }
 508                         }
 509
 510                         //
 511                         // Adjust the size of the pos_values if it had params
 512                         //
 513                         if (group_in_params_array != Int32.MaxValue){
 514                                 int argc = group_in_params_array+1;
 515                                 object [] new_pos_values = new object [argc];
 516
 517                                 for (int p = 0; p < argc; p++)
 518                                         new_pos_values [p] = pos_values [p];
 519                                 pos_values = new_pos_values;
 520                         }
 521
 522                         try {
 523                                 if (named_args.Count > 0) {
 524                                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 525                                         field_info_arr = new FieldInfo [field_infos.Count];
 526                                         field_values_arr = new object [field_values.Count];
 527                                         prop_values_arr = new object [prop_values.Count];
 528
 529                                         field_infos.CopyTo  (field_info_arr, 0);
 530                                         field_values.CopyTo (field_values_arr, 0);
 531
 532                                         prop_values.CopyTo  (prop_values_arr, 0);
 533                                         prop_infos.CopyTo   (prop_info_arr, 0);
 534
 535                                         cb = new CustomAttributeBuilder (
 536                                                 (ConstructorInfo) constructor, pos_values,
 537                                                 prop_info_arr, prop_values_arr,
 538                                                 field_info_arr, field_values_arr);
 539                                 }
 540                                 else
 541                                         cb = new CustomAttributeBuilder (
 542                                                 (ConstructorInfo) constructor, pos_values);
 543                         } catch (NullReferenceException) {
 544                                 //
 545                                 // Don't know what to do here
 546                                 //
 547                                 Report.Warning (
 548                                         -101, Location, "NullReferenceException while trying to create attribute." +
 549                                         "Something's wrong!");
 550                         } catch (Exception e) {
 551                                 //
 552                                 // Sample:
 553                                 // using System.ComponentModel;
 554                                 // [DefaultValue (CollectionChangeAction.Add)]
 555                                 // class X { static void Main () {} }
 556                                 //
 557                                 Report.Warning (
 558                                         -23, Location, "The compiler can not encode this attribute in .NET due to a bug in the .NET runtime. Try the Mono runtime. The exception was: " + e.Message);
 559                         }
 560
 561                         return cb;
 562                 }
 563
 564                 /// <summary>
 565                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 566                 /// </summary>
 567                 public string GetValidTargets ()
 568                 {
 569                         StringBuilder sb = new StringBuilder ();
 570                         AttributeTargets targets = GetAttributeUsage ().ValidOn;
 571
 572                         if ((targets & AttributeTargets.Assembly) != 0)
 573                                 sb.Append ("'assembly' ");
 574
 575                         if ((targets & AttributeTargets.Class) != 0)
 576                                 sb.Append ("'class' ");
 577
 578                         if ((targets & AttributeTargets.Constructor) != 0)
 579                                 sb.Append ("'constructor' ");
 580
 581                         if ((targets & AttributeTargets.Delegate) != 0)
 582                                 sb.Append ("'delegate' ");
 583
 584                         if ((targets & AttributeTargets.Enum) != 0)
 585                                 sb.Append ("'enum' ");
 586
 587                         if ((targets & AttributeTargets.Event) != 0)
 588                                 sb.Append ("'event' ");
 589
 590                         if ((targets & AttributeTargets.Field) != 0)
 591                                 sb.Append ("'field' ");
 592
 593                         if ((targets & AttributeTargets.Interface) != 0)
 594                                 sb.Append ("'interface' ");
 595
 596                         if ((targets & AttributeTargets.Method) != 0)
 597                                 sb.Append ("'method' ");
 598
 599                         if ((targets & AttributeTargets.Module) != 0)
 600                                 sb.Append ("'module' ");
 601
 602                         if ((targets & AttributeTargets.Parameter) != 0)
 603                                 sb.Append ("'parameter' ");
 604
 605                         if ((targets & AttributeTargets.Property) != 0)
 606                                 sb.Append ("'property' ");
 607
 608                         if ((targets & AttributeTargets.ReturnValue) != 0)
 609                                 sb.Append ("'return' ");
 610
 611                         if ((targets & AttributeTargets.Struct) != 0)
 612                                 sb.Append ("'struct' ");
 613
 614                         return sb.ToString ();
 615
 616                 }
 617
 618                 /// <summary>
 619                 /// Returns AttributeUsage attribute for this type
 620                 /// </summary>
 621                 public AttributeUsageAttribute GetAttributeUsage ()
 622                 {
 623                         AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
 624                         if (ua != null)
 625                                 return ua;
 626
 627                         Class attr_class = TypeManager.LookupClass (Type);
 628
 629                         if (attr_class == null) {
 630                                 object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 631                                 ua = (AttributeUsageAttribute)usage_attr [0];
 632                                 usage_attr_cache.Add (Type, ua);
 633                                 return ua;
 634                         }
 635
 636                         return attr_class.AttributeUsage;
 637                 }
 638
 639                 /// <summary>
 640                 /// Returns custom name of indexer
 641                 /// </summary>
 642                 public string GetIndexerAttributeValue (EmitContext ec)
 643                 {
 644                         if (pos_values == null) {
 645                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 646                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 647                                 Resolve (ec);
 648                         }
 649
 650                         return pos_values [0] as string;
 651                 }
 652
 653                 /// <summary>
 654                 /// Returns condition of ConditionalAttribute
 655                 /// </summary>
 656                 public string GetConditionalAttributeValue (DeclSpace ds)
 657                 {
 658                         if (pos_values == null) {
 659                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 660
 661                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 662                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 663                                 Resolve (ec);
 664                         }
 665
 666                         // Some error occurred
 667                         if (pos_values [0] == null)
 668                                 return null;
 669
 670                         return (string)pos_values [0];
 671                 }
 672
 673                 /// <summary>
 674                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 675                 /// </summary>
 676                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 677                 {
 678                         if (pos_values == null) {
 679                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 680
 681                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 682                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 683                                 Resolve (ec);
 684                         }
 685
 686                         // Some error occurred
 687                         if (pos_values == null)
 688                                 return null;
 689
 690                         if (pos_values.Length == 0)
 691                                 return new ObsoleteAttribute ();
 692
 693                         if (pos_values.Length == 1)
 694                                 return new ObsoleteAttribute ((string)pos_values [0]);
 695
 696                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 697                 }
 698
 699                 /// <summary>
 700                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 701                 /// before ApplyAttribute. We need to resolve the arguments.
 702                 /// This situation occurs when class deps is differs from Emit order.
 703                 /// </summary>
 704                 public bool GetClsCompliantAttributeValue (DeclSpace ds)
 705                 {
 706                         if (pos_values == null) {
 707                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 708
 709                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 710                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 711                                 Resolve (ec);
 712                         }
 713
 714                         // Some error occurred
 715                         if (pos_values [0] == null)
 716                                 return false;
 717
 718                         return (bool)pos_values [0];
 719                 }
 720
 721                 object GetValue (object value)
 722                 {
 723                         if (value is EnumConstant)
 724                                 return ((EnumConstant) value).GetValue ();
 725                         else
 726                                 return value;
 727                 }
 728
 729                 public object GetPositionalValue (int i)
 730                 {
 731                         return (pos_values == null) ? null : pos_values[i];
 732                 }
 733
 734                 object GetFieldValue (string name)
 735                 {
 736                         int i;
 737                         if (field_info_arr == null)
 738                                 return null;
 739                         i = 0;
 740                         foreach (FieldInfo fi in field_info_arr) {
 741                                 if (fi.Name == name)
 742                                         return GetValue (field_values_arr [i]);
 743                                 i++;
 744                         }
 745                         return null;
 746                 }
 747
 748                 public UnmanagedMarshal GetMarshal ()
 749                 {
 750                         object o = GetFieldValue ("ArraySubType");
 751                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;
 752
 753                         switch (UnmanagedType) {
 754                         case UnmanagedType.CustomMarshaler:
 755                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
 756                                                                        BindingFlags.Static | BindingFlags.Public);
 757                                 if (define_custom == null)
 758                                         return null;
 759
 760                                 object [] args = new object [4];
 761                                 args [0] = GetFieldValue ("MarshalTypeRef");
 762                                 args [1] = GetFieldValue ("MarshalCookie");
 763                                 args [2] = GetFieldValue ("MarshalType");
 764                                 args [3] = Guid.Empty;
 765                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
 766
 767                         case UnmanagedType.LPArray:
 768                                 return UnmanagedMarshal.DefineLPArray (array_sub_type);
 769
 770                         case UnmanagedType.SafeArray:
 771                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
 772
 773                         case UnmanagedType.ByValArray:
 774                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
 775
 776                         case UnmanagedType.ByValTStr:
 777                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
 778
 779                         default:
 780                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
 781                         }
 782                 }
 783
 784                 public bool IsInternalCall
 785                 {
 786                         get { return ImplOptions == MethodImplOptions.InternalCall; }
 787                 }
 788
 789                 /// <summary>
 790                 /// Emit attribute for Attributable symbol
 791                 /// </summary>
 792                 public void Emit (EmitContext ec, Attributable ias, ListDictionary emitted_attr)
 793                 {
 794                         CustomAttributeBuilder cb = Resolve (ec);
 795                         if (cb == null)
 796                                 return;
 797
 798                         AttributeUsageAttribute usage_attr = GetAttributeUsage ();
 799                         if ((usage_attr.ValidOn & Target) == 0) {
 800                                 Report.Error (592, Location, "Attribute '{0}' is not valid on this declaration type. It is valid on {1} declarations only.", Name, GetValidTargets ());
 801                                 return;
 802                         }
 803
 804                         ias.ApplyAttributeBuilder (this, cb);
 805
 806                         if (!usage_attr.AllowMultiple) {
 807                                 ArrayList emitted_targets = (ArrayList)emitted_attr [Type];
 808                                 if (emitted_targets == null) {
 809                                         emitted_targets = new ArrayList ();
 810                                         emitted_attr.Add (Type, emitted_targets);
 811                                 } else if (emitted_targets.Contains (Target)) {
 812                                 Report.Error (579, Location, "Duplicate '" + Name + "' attribute");
 813                                         return;
 814                                 }
 815                                 emitted_targets.Add (Target);
 816                         }
 817
 818                         if (!RootContext.VerifyClsCompliance)
 819                                 return;
 820
 821                         // Here we are testing attribute arguments for array usage (error 3016)
 822                         if (ias.IsClsCompliaceRequired (ec.DeclSpace)) {
 823                                 if (Arguments == null)
 824                                         return;
 825
 826                                 ArrayList pos_args = (ArrayList) Arguments [0];
 827                                 if (pos_args != null) {
 828                                         foreach (Argument arg in pos_args) {
 829                                                 // Type is undefined (was error 246)
 830                                                 if (arg.Type == null)
 831                                                         return;
 832
 833                                                 if (arg.Type.IsArray) {
 834                                                         Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 835                                                         return;
 836                                                 }
 837                                         }
 838                                 }
 839
 840                                 if (Arguments.Count < 2)
 841                                         return;
 842
 843                                 ArrayList named_args = (ArrayList) Arguments [1];
 844                                 foreach (DictionaryEntry de in named_args) {
 845                                         Argument arg  = (Argument) de.Value;
 846
 847                                         // Type is undefined (was error 246)
 848                                         if (arg.Type == null)
 849                                                 return;
 850
 851                                         if (arg.Type.IsArray) {
 852                                                 Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 853                                                 return;
 854                                         }
 855                                 }
 856                         }
 857                 }
 858
 859                 public object GetValue (EmitContext ec, Constant c, Type target)
 860                 {
 861                         if (Convert.ImplicitConversionExists (ec, c, target))
 862                                 return c.GetValue ();
 863
 864                         Convert.Error_CannotImplicitConversion (Location, c.Type, target);
 865                         return null;
 866                 }
 867
 868                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,
 869                                                           MethodAttributes flags, Type ret_type, Type [] param_types)
 870                 {
 871                         //
 872                         // We extract from the attribute the information we need
 873                         //
 874
 875                         if (Arguments == null) {
 876                                 Console.WriteLine ("Internal error : this is not supposed to happen !");
 877                                 return null;
 878                         }
 879
 880                         ResolveType (ec, true);
 881                         if (Type == null)
 882                                 return null;
 883
 884                         ArrayList named_args = new ArrayList ();
 885
 886                         ArrayList pos_args = (ArrayList) Arguments [0];
 887                         if (Arguments.Count > 1)
 888                                 named_args = (ArrayList) Arguments [1];
 889
 890
 891                         string dll_name = null;
 892
 893                         Argument tmp = (Argument) pos_args [0];
 894
 895                         if (!tmp.Resolve (ec, Location))
 896                                 return null;
 897
 898                         if (tmp.Expr is Constant)
 899                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();
 900                         else {
 901                                 Error_AttributeArgumentNotValid (Location);
 902                                 return null;
 903                         }
 904
 905                         // Now we process the named arguments
 906                         CallingConvention cc = CallingConvention.Winapi;
 907                         CharSet charset = CharSet.Ansi;
 908                         bool preserve_sig = true;
 909 #if FIXME
 910                         bool exact_spelling = false;
 911 #endif
 912                         bool set_last_err = false;
 913                         string entry_point = null;
 914
 915                         for (int i = 0; i < named_args.Count; i++) {
 916
 917                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 918
 919                                 string member_name = (string) de.Key;
 920                                 Argument a  = (Argument) de.Value;
 921
 922                                 if (!a.Resolve (ec, Location))
 923                                         return null;
 924
 925                                 Expression member = Expression.MemberLookup (
 926                                         ec, Type, member_name,
 927                                         MemberTypes.Field | MemberTypes.Property,
 928                                         BindingFlags.Public | BindingFlags.Instance,
 929                                         Location);
 930
 931                                 if (member == null || !(member is FieldExpr)) {
 932                                         Error_InvalidNamedArgument (member_name);
 933                                         return null;
 934                                 }
 935
 936                                 if (member is FieldExpr) {
 937                                         FieldExpr fe = (FieldExpr) member;
 938                                         FieldInfo fi = fe.FieldInfo;
 939
 940                                         if (fi.IsInitOnly) {
 941                                                 Error_InvalidNamedArgument (member_name);
 942                                                 return null;
 943                                         }
 944
 945                                         if (a.Expr is Constant) {
 946                                                 Constant c = (Constant) a.Expr;
 947
 948                                                 try {
 949                                                         if (member_name == "CallingConvention"){
 950                                                                 object val = GetValue (ec, c, typeof (CallingConvention));
 951                                                                 if (val == null)
 952                                                                         return null;
 953                                                                 cc = (CallingConvention) val;
 954                                                         } else if (member_name == "CharSet"){
 955                                                                 charset = (CharSet) c.GetValue ();
 956                                                         } else if (member_name == "EntryPoint")
 957                                                                 entry_point = (string) c.GetValue ();
 958                                                         else if (member_name == "SetLastError")
 959                                                                 set_last_err = (bool) c.GetValue ();
 960 #if FIXME
 961                                                         else if (member_name == "ExactSpelling")
 962                                                                 exact_spelling = (bool) c.GetValue ();
 963 #endif
 964                                                         else if (member_name == "PreserveSig")
 965                                                                 preserve_sig = (bool) c.GetValue ();
 966                                                 } catch (InvalidCastException){
 967                                                         Error_InvalidNamedArgument (member_name);
 968                                                         Error_AttributeArgumentNotValid (Location);
 969                                                 }
 970                                         } else {
 971                                                 Error_AttributeArgumentNotValid (Location);
 972                                                 return null;
 973                                         }
 974
 975                                 }
 976                         }
 977
 978                         if (entry_point == null)
 979                                 entry_point = name;
 980                         if (set_last_err)
 981                                 charset = (CharSet)((int)charset | 0x40);
 982
 983                         MethodBuilder mb = builder.DefinePInvokeMethod (
 984                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,
 985                                 CallingConventions.Standard,
 986                                 ret_type,
 987                                 param_types,
 988                                 cc,
 989                                 charset);
 990
 991                         if (preserve_sig)
 992                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);
 993
 994                         return mb;
 995                 }
 996
 997                 private Expression GetValue ()
 998                 {
 999                         if ((Arguments == null) || (Arguments.Count < 1))
1000                                 return null;
1001                         ArrayList al = (ArrayList) Arguments [0];
1002                         if ((al == null) || (al.Count < 1))
1003                                 return null;
1004                         Argument arg = (Argument) al [0];
1005                         if ((arg == null) || (arg.Expr == null))
1006                                 return null;
1007                         return arg.Expr;
1008                 }
1009
1010                 public string GetString ()
1011                 {
1012                         Expression e = GetValue ();
1013                         if (e is StringLiteral)
1014                                 return (e as StringLiteral).Value;
1015                         return null;
1016                 }
1017
1018                 public bool GetBoolean ()
1019                 {
1020                         Expression e = GetValue ();
1021                         if (e is BoolLiteral)
1022                                 return (e as BoolLiteral).Value;
1023                         return false;
1024                 }
1025         }
1026
1027
1028         /// <summary>
1029         /// For global attributes (assembly, module) we need special handling.
1030         /// Attributes can be located in the several files
1031         /// </summary>
1032         public class GlobalAttribute: Attribute
1033         {
1034                 public readonly NamespaceEntry ns;
1035
1036                 public GlobalAttribute (TypeContainer container, string target, string name, ArrayList args, Location loc):
1037                         base (target, name, args, loc)
1038                 {
1039                         ns = container.NamespaceEntry;
1040                 }
1041
1042                 protected override Type CheckAttributeType (EmitContext ec, bool complain)
1043                 {
1044                         NamespaceEntry old = ec.DeclSpace.NamespaceEntry;
1045                         if (old == null || old.NS == null || old.NS == Namespace.Root)
1046                                 ec.DeclSpace.NamespaceEntry = ns;
1047                         return base.CheckAttributeType (ec, complain);
1048                 }
1049         }
1050
1051         public class Attributes {
1052                 public ArrayList Attrs;
1053
1054                 public Attributes (Attribute a)
1055                 {
1056                         Attrs = new ArrayList ();
1057                         Attrs.Add (a);
1058                 }
1059
1060                 public Attributes (ArrayList attrs)
1061                 {
1062                         Attrs = attrs;
1063                 }
1064
1065                 public void AddAttributes (ArrayList attrs)
1066                 {
1067                         Attrs.AddRange (attrs);
1068                 }
1069
1070                 /// <summary>
1071                 /// Checks whether attribute target is valid for the current element
1072                 /// </summary>
1073                 public void CheckTargets (Attributable member)
1074                 {
1075                         string[] valid_targets = member.ValidAttributeTargets;
1076                         foreach (Attribute a in Attrs) {
1077                                 if (a.ExplicitTarget == null || a.ExplicitTarget == valid_targets [0]) {
1078                                         a.Target = member.AttributeTargets;
1079                                         continue;
1080                                 }
1081
1082                                 // TODO: we can skip the first item
1083                                 if (((IList) valid_targets).Contains (a.ExplicitTarget)) {
1084                                         switch (a.ExplicitTarget) {
1085                                                 case "return": a.Target = AttributeTargets.ReturnValue; continue;
1086                                                 case "param": a.Target = AttributeTargets.Parameter; continue;
1087                                                 case "field": a.Target = AttributeTargets.Field; continue;
1088                                                 case "method": a.Target = AttributeTargets.Method; continue;
1089                                                 case "property": a.Target = AttributeTargets.Property; continue;
1090                                         }
1091                                         throw new InternalErrorException ("Unknown explicit target: " + a.ExplicitTarget);
1092                                 }
1093
1094                                 StringBuilder sb = new StringBuilder ();
1095                                 foreach (string s in valid_targets) {
1096                                         sb.Append (s);
1097                                         sb.Append (", ");
1098                                 }
1099                                 sb.Remove (sb.Length - 2, 2);
1100                                 Report.Error (657, a.Location, "'{0}' is not a valid attribute location for this declaration. Valid attribute locations for this declaration are '{1}'", a.Target, sb.ToString ());
1101                         }
1102                 }
1103
1104                 private Attribute Search (Type t, EmitContext ec, bool complain)
1105                 {
1106                         foreach (Attribute a in Attrs) {
1107                                 if (a.ResolveType (ec, complain) == t)
1108                                         return a;
1109                         }
1110                         return null;
1111                 }
1112
1113                 public Attribute Search (Type t, EmitContext ec)
1114                 {
1115                         return Search (t, ec, true);
1116                 }
1117
1118                 /// <summary>
1119                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1120                 /// </summary>
1121                 public Attribute[] SearchMulti (Type t, EmitContext ec)
1122                 {
1123                         ArrayList ar = null;
1124
1125                         foreach (Attribute a in Attrs) {
1126                                 if (a.ResolveType (ec, false) == t) {
1127                                         if (ar == null)
1128                                                 ar = new ArrayList ();
1129                                         ar.Add (a);
1130                                 }
1131                         }
1132
1133                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1134                 }
1135
1136                 public void Emit (EmitContext ec, Attributable ias)
1137                 {
1138                         ListDictionary ld = new ListDictionary ();
1139
1140                         foreach (Attribute a in Attrs)
1141                                 a.Emit (ec, ias, ld);
1142                 }
1143
1144                 public bool Contains (Type t, EmitContext ec)
1145                 {
1146                         return Search (t, ec) != null;
1147                 }
1148
1149                 public Attribute GetClsCompliantAttribute (EmitContext ec)
1150                 {
1151                         return Search (TypeManager.cls_compliant_attribute_type, ec, false);
1152                 }
1153
1154                 /// <summary>
1155                 /// Pulls the IndexerName attribute from an Indexer if it exists.
1156                 /// </summary>
1157                 public Attribute GetIndexerNameAttribute (EmitContext ec)
1158                 {
1159                         Attribute a = Search (TypeManager.indexer_name_type, ec, false);
1160                         if (a == null)
1161                                 return null;
1162
1163                         // Remove the attribute from the list because it is not emitted
1164                         Attrs.Remove (a);
1165                         return a;
1166                 }
1167
1168         }
1169
1170         /// <summary>
1171         /// Helper class for attribute verification routine.
1172         /// </summary>
1173         sealed class AttributeTester
1174         {
1175                 static PtrHashtable analyzed_types = new PtrHashtable ();
1176                 static PtrHashtable analyzed_types_obsolete = new PtrHashtable ();
1177                 static PtrHashtable analyzed_member_obsolete = new PtrHashtable ();
1178                 static PtrHashtable analyzed_method_excluded = new PtrHashtable ();
1179
1180                 private AttributeTester ()
1181                 {
1182                 }
1183
1184                 /// <summary>
1185                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1186                 /// It tests differing only in ref or out, or in array rank.
1187                 /// </summary>
1188                 public static bool AreOverloadedMethodParamsClsCompliant (Type[] types_a, Type[] types_b)
1189                 {
1190                         if (types_a == null || types_b == null)
1191                                 return true;
1192
1193                         if (types_a.Length != types_b.Length)
1194                                 return true;
1195
1196                         for (int i = 0; i < types_b.Length; ++i) {
1197                                 Type aType = types_a [i];
1198                                 Type bType = types_b [i];
1199
1200                                 if (aType.IsArray && bType.IsArray && aType.GetArrayRank () != bType.GetArrayRank () && aType.GetElementType () == bType.GetElementType ()) {
1201                                         return false;
1202                                 }
1203
1204                                 Type aBaseType = aType;
1205                                 bool is_either_ref_or_out = false;
1206
1207                                 if (aType.IsByRef || aType.IsPointer) {
1208                                         aBaseType = aType.GetElementType ();
1209                                         is_either_ref_or_out = true;
1210                                 }
1211
1212                                 Type bBaseType = bType;
1213                                 if (bType.IsByRef || bType.IsPointer)
1214                                 {
1215                                         bBaseType = bType.GetElementType ();
1216                                         is_either_ref_or_out = !is_either_ref_or_out;
1217                                 }
1218
1219                                 if (aBaseType != bBaseType)
1220                                         continue;
1221
1222                                 if (is_either_ref_or_out)
1223                                         return false;
1224                         }
1225                         return true;
1226                 }
1227
1228                 /// <summary>
1229                 /// Goes through all parameters and test if they are CLS-Compliant.
1230                 /// </summary>
1231                 public static bool AreParametersCompliant (Parameter[] fixedParameters, Location loc)
1232                 {
1233                         if (fixedParameters == null)
1234                                 return true;
1235
1236                         foreach (Parameter arg in fixedParameters) {
1237                                 if (!AttributeTester.IsClsCompliant (arg.ParameterType)) {
1238                                         Report.Error (3001, loc, "Argument type '{0}' is not CLS-compliant", arg.GetSignatureForError ());
1239                                         return false;
1240                                 }
1241                         }
1242                         return true;
1243                 }
1244
1245
1246                 /// <summary>
1247                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1248                 /// </summary>
1249                 public static bool IsClsCompliant (Type type)
1250                 {
1251                         if (type == null)
1252                                 return true;
1253
1254                         object type_compliance = analyzed_types[type];
1255                         if (type_compliance != null)
1256                                 return type_compliance == TRUE;
1257
1258                         if (type.IsPointer) {
1259                                 analyzed_types.Add (type, null);
1260                                 return false;
1261                         }
1262
1263                         bool result;
1264                         if (type.IsArray || type.IsByRef)       {
1265                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1266                         } else {
1267                                 result = AnalyzeTypeCompliance (type);
1268                         }
1269                         analyzed_types.Add (type, result ? TRUE : FALSE);
1270                         return result;
1271                 }
1272
1273                 static object TRUE = new object ();
1274                 static object FALSE = new object ();
1275
1276                 public static void VerifyModulesClsCompliance ()
1277                 {
1278                         Module[] modules = TypeManager.Modules;
1279                         if (modules == null)
1280                                 return;
1281
1282                         // The first module is generated assembly
1283                         for (int i = 1; i < modules.Length; ++i) {
1284                                 Module module = modules [i];
1285                                 if (!IsClsCompliant (module)) {
1286                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute to match the assembly", module.Name);
1287                                         return;
1288                                 }
1289                         }
1290                 }
1291
1292                 /// <summary>
1293                 /// Tests container name for CLS-Compliant name (differing only in case)
1294                 /// </summary>
1295                 public static void VerifyTopLevelNameClsCompliance ()
1296                 {
1297                         Hashtable locase_table = new Hashtable ();
1298
1299                         // Convert imported type names to lower case and ignore not cls compliant
1300                         foreach (DictionaryEntry de in TypeManager.all_imported_types) {
1301                                 Type t = (Type)de.Value;
1302                                 if (!AttributeTester.IsClsCompliant (t))
1303                                         continue;
1304
1305                                 locase_table.Add (((string)de.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture), t);
1306                         }
1307
1308                         foreach (DictionaryEntry de in RootContext.Tree.Decls) {
1309                                 DeclSpace decl = (DeclSpace)de.Value;
1310                                 if (!decl.IsClsCompliaceRequired (decl))
1311                                         continue;
1312
1313                                 string lcase = decl.Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1314                                 if (!locase_table.Contains (lcase)) {
1315                                         locase_table.Add (lcase, decl);
1316                                         continue;
1317                                 }
1318
1319                                 object conflict = locase_table [lcase];
1320                                 if (conflict is Type)
1321                                         Report.SymbolRelatedToPreviousError ((Type)conflict);
1322                                 else
1323                                         Report.SymbolRelatedToPreviousError ((MemberCore)conflict);
1324
1325                                 Report.Error (3005, decl.Location, "Identifier '{0}' differing only in case is not CLS-compliant", decl.GetSignatureForError ());
1326                         }
1327                 }
1328
1329                 static bool IsClsCompliant (ICustomAttributeProvider attribute_provider)
1330                 {
1331                         object[] CompliantAttribute = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1332                         if (CompliantAttribute.Length == 0)
1333                                 return false;
1334
1335                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1336                 }
1337
1338                 static bool AnalyzeTypeCompliance (Type type)
1339                 {
1340                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1341                         if (ds != null) {
1342                                 return ds.IsClsCompliaceRequired (ds.Parent);
1343                         }
1344
1345                         if (type.IsGenericParameter)
1346                                 return false;
1347
1348                         object[] CompliantAttribute = type.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1349                         if (CompliantAttribute.Length == 0)
1350                                 return IsClsCompliant (type.Assembly);
1351
1352                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1353                 }
1354
1355                 /// <summary>
1356                 /// Returns instance of ObsoleteAttribute when type is obsolete
1357                 /// </summary>
1358                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1359                 {
1360                         object type_obsolete = analyzed_types_obsolete [type];
1361                         if (type_obsolete == FALSE)
1362                                 return null;
1363
1364                         if (type_obsolete != null)
1365                                 return (ObsoleteAttribute)type_obsolete;
1366
1367                         ObsoleteAttribute result = null;
1368                         if (type.IsByRef || type.IsArray || type.IsPointer) {
1369                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1370                         } else if (type.IsGenericParameter || type.IsGenericInstance)
1371                                 return null;
1372                         else {
1373                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1374
1375                                 // Type is external, we can get attribute directly
1376                                 if (type_ds == null) {
1377                                         object[] attribute = type.GetCustomAttributes (TypeManager.obsolete_attribute_type, false);
1378                                         if (attribute.Length == 1)
1379                                                 result = (ObsoleteAttribute)attribute [0];
1380                                 } else {
1381                                         result = type_ds.GetObsoleteAttribute (type_ds);
1382                                 }
1383                         }
1384
1385                         analyzed_types_obsolete.Add (type, result == null ? FALSE : result);
1386                         return result;
1387                 }
1388
1389                 /// <summary>
1390                 /// Returns instance of ObsoleteAttribute when method is obsolete
1391                 /// </summary>
1392                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1393                 {
1394                         IMethodData mc = TypeManager.GetMethod (mb);
1395                         if (mc != null)
1396                                 return mc.GetObsoleteAttribute ();
1397
1398                         // compiler generated methods are not registered by AddMethod
1399                         if (mb.DeclaringType is TypeBuilder)
1400                                 return null;
1401
1402                         return GetMemberObsoleteAttribute (mb);
1403                 }
1404
1405                 /// <summary>
1406                 /// Returns instance of ObsoleteAttribute when member is obsolete
1407                 /// </summary>
1408                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1409                 {
1410                         object type_obsolete = analyzed_member_obsolete [mi];
1411                         if (type_obsolete == FALSE)
1412                                 return null;
1413
1414                         if (type_obsolete != null)
1415                                 return (ObsoleteAttribute)type_obsolete;
1416
1417                         if ((mi.DeclaringType is TypeBuilder) || mi.DeclaringType.IsGenericInstance)
1418                                 return null;
1419
1420                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false) as ObsoleteAttribute;
1421                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1422                         return oa;
1423                 }
1424
1425                 /// <summary>
1426                 /// Common method for Obsolete error/warning reporting.
1427                 /// </summary>
1428                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1429                 {
1430                         if (oa.IsError) {
1431                                 Report.Error (619, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1432                                 return;
1433                         }
1434
1435                         if (oa.Message == null) {
1436                                 Report.Warning (612, loc, "'{0}' is obsolete", member);
1437                                 return;
1438                         }
1439                         if (RootContext.WarningLevel >= 2)
1440                                 Report.Warning (618, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1441                 }
1442
1443                 public static bool IsConditionalMethodExcluded (MethodBase mb)
1444                 {
1445                         object excluded = analyzed_method_excluded [mb];
1446                         if (excluded != null)
1447                                 return excluded == TRUE ? true : false;
1448
1449                         if (mb.Mono_IsInflatedMethod)
1450                                 return false;
1451
1452                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (TypeManager.conditional_attribute_type, true) as ConditionalAttribute[];
1453                         if (attrs.Length == 0) {
1454                                 analyzed_method_excluded.Add (mb, FALSE);
1455                                 return false;
1456                         }
1457
1458                         foreach (ConditionalAttribute a in attrs) {
1459                                 if (RootContext.AllDefines.Contains (a.ConditionString)) {
1460                                         analyzed_method_excluded.Add (mb, FALSE);
1461                                         return false;
1462                                 }
1463                         }
1464                         analyzed_method_excluded.Add (mb, TRUE);
1465                         return true;
1466                 }
1467         }
1468 }