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                                 result = e;
 215                                 return true;
 216                         }
 217
 218                         Constant constant = e as Constant;
 219                         if (constant != null) {
 220                                 if (e.Type != arg_type) {
 221                                         constant = Const.ChangeType (loc, constant, arg_type);
 222                                         if (constant == null) {
 223                                                 result = null;
 224                                                 Error_AttributeArgumentNotValid (loc);
 225                                                 return false;
 226                                         }
 227                                 }
 228                                 result = constant.GetValue ();
 229                                 return true;
 230                         } else if (e is TypeOf) {
 231                                 result = ((TypeOf) e).TypeArg;
 232                                 return true;
 233                         } else if (e is ArrayCreation){
 234                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();
 235                                 if (result != null)
 236                                         return true;
 237                         } else if (e is EmptyCast) {
 238                                 Expression child = ((EmptyCast)e).Child;
 239                                 return GetAttributeArgumentExpression (child, loc, child.Type, out result);
 240                         }
 241
 242                         result = null;
 243                         Error_AttributeArgumentNotValid (loc);
 244                         return false;
 245                 }
 246
 247                 public CustomAttributeBuilder Resolve (EmitContext ec)
 248                 {
 249                         Type oldType = Type;
 250
 251                         // Sanity check.
 252                         Type = CheckAttributeType (ec, true);
 253
 254                         if (oldType == null && Type == null)
 255                                 return null;
 256                         if (oldType != null && oldType != Type){
 257                                 Report.Error (-27, Location,
 258                                               "Attribute {0} resolved to different types at different times: {1} vs. {2}",
 259                                               Name, oldType, Type);
 260                                 return null;
 261                         }
 262
 263                         if (Type.IsAbstract) {
 264                                 Report.Error (653, Location, "Cannot apply attribute class '{0}' because it is abstract", Name);
 265                                 return null;
 266                         }
 267
 268                         bool MethodImplAttr = false;
 269                         bool MarshalAsAttr = false;
 270                         bool GuidAttr = false;
 271                         bool usage_attr = false;
 272
 273                         bool DoCompares = true;
 274
 275                         //
 276                         // If we are a certain special attribute, we
 277                         // set the information accordingly
 278                         //
 279
 280                         if (Type == TypeManager.attribute_usage_type)
 281                                 usage_attr = true;
 282                         else if (Type == TypeManager.methodimpl_attr_type)
 283                                 MethodImplAttr = true;
 284                         else if (Type == TypeManager.marshal_as_attr_type)
 285                                 MarshalAsAttr = true;
 286                         else if (Type == TypeManager.guid_attr_type)
 287                                 GuidAttr = true;
 288                         else
 289                                 DoCompares = false;
 290
 291                         // Now we extract the positional and named arguments
 292
 293                         ArrayList pos_args = new ArrayList ();
 294                         ArrayList named_args = new ArrayList ();
 295                         int pos_arg_count = 0;
 296
 297                         if (Arguments != null) {
 298                                 pos_args = (ArrayList) Arguments [0];
 299                                 if (pos_args != null)
 300                                         pos_arg_count = pos_args.Count;
 301                                 if (Arguments.Count > 1)
 302                                         named_args = (ArrayList) Arguments [1];
 303                         }
 304
 305                         pos_values = new object [pos_arg_count];
 306                         object[] real_pos_values = new object [pos_arg_count];
 307
 308                         //
 309                         // First process positional arguments
 310                         //
 311
 312                         int i;
 313                         for (i = 0; i < pos_arg_count; i++) {
 314                                 Argument a = (Argument) pos_args [i];
 315                                 Expression e;
 316
 317                                 if (!a.Resolve (ec, Location))
 318                                         return null;
 319
 320                                 e = a.Expr;
 321
 322                                 object val;
 323                                 if (!GetAttributeArgumentExpression (e, Location, a.Type, out val))
 324                                         return null;
 325
 326                                 if (val is EnumConstant) {
 327                                         EnumConstant econst = (EnumConstant) e;
 328
 329                                         pos_values [i] = val = econst.GetValue ();
 330                                         real_pos_values [i] = econst.GetValueAsEnumType ();
 331                                 } else {
 332                                         real_pos_values [i] = pos_values [i] = val;
 333                                 }
 334
 335                                 if (DoCompares){
 336                                         if (usage_attr)
 337                                                 usage_attribute = new AttributeUsageAttribute ((AttributeTargets) val);
 338                                         else if (MethodImplAttr)
 339                                                 this.ImplOptions = (MethodImplOptions) val;
 340                                         else if (GuidAttr){
 341                                                 //
 342                                                 // we will later check the validity of the type
 343                                                 //
 344                                                 if (val is string){
 345                                                         if (!ValidateGuid ((string) val))
 346                                                                 return null;
 347                                                 }
 348
 349                                         } else if (MarshalAsAttr)
 350                                                 this.UnmanagedType =
 351                                                 (System.Runtime.InteropServices.UnmanagedType) val;
 352                                 }
 353                         }
 354
 355                         //
 356                         // Now process named arguments
 357                         //
 358
 359                         ArrayList field_infos = null;
 360                         ArrayList prop_infos  = null;
 361                         ArrayList field_values = null;
 362                         ArrayList prop_values = null;
 363
 364                         if (named_args.Count > 0) {
 365                                 field_infos = new ArrayList ();
 366                                 prop_infos  = new ArrayList ();
 367                                 field_values = new ArrayList ();
 368                                 prop_values = new ArrayList ();
 369                         }
 370
 371                         Hashtable seen_names = new Hashtable();
 372
 373                         for (i = 0; i < named_args.Count; i++) {
 374                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 375                                 string member_name = (string) de.Key;
 376                                 Argument a  = (Argument) de.Value;
 377                                 Expression e;
 378
 379                                 if (seen_names.Contains(member_name)) {
 380                                         Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
 381                                         return null;
 382                                 }
 383                                 seen_names.Add(member_name, 1);
 384
 385                                 if (!a.Resolve (ec, Location))
 386                                         return null;
 387
 388                                 Expression member = Expression.MemberLookup (
 389                                         ec, Type, member_name,
 390                                         MemberTypes.Field | MemberTypes.Property,
 391                                         BindingFlags.Public | BindingFlags.Instance,
 392                                         Location);
 393
 394                                 if (member == null) {
 395                                         member = Expression.MemberLookup (ec, Type, member_name,
 396                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 397                                                 Location);
 398
 399                                         if (member != null) {
 400                                                 Report.Error (122, Location, "'{0}' is inaccessible due to its protection level", GetFullMemberName (member_name));
 401                                                 return null;
 402                                         }
 403                                 }
 404
 405                                 if (member == null || !(member is PropertyExpr || member is FieldExpr)) {
 406                                         Error_InvalidNamedArgument (member_name);
 407                                         return null;
 408                                 }
 409
 410                                 e = a.Expr;
 411                                 if (e is TypeParameterExpr){
 412                                         Error_TypeParameterInAttribute (Location);
 413                                         return null;
 414                                 }
 415
 416                                 if (member is PropertyExpr) {
 417                                         PropertyExpr pe = (PropertyExpr) member;
 418                                         PropertyInfo pi = pe.PropertyInfo;
 419
 420                                         if (!pi.CanWrite || !pi.CanRead) {
 421                                                 Report.SymbolRelatedToPreviousError (pi);
 422                                                 Error_InvalidNamedArgument (member_name);
 423                                                 return null;
 424                                         }
 425
 426                                         object value;
 427                                         if (!GetAttributeArgumentExpression (e, Location, pi.PropertyType, out value))
 428                                                                 return null;
 429
 430                                                 if (usage_attribute != null) {
 431                                                         if (member_name == "AllowMultiple")
 432                                                         usage_attribute.AllowMultiple = (bool) value;
 433                                                         if (member_name == "Inherited")
 434                                                         usage_attribute.Inherited = (bool) value;
 435                                         }
 436
 437                                         prop_values.Add (value);
 438                                         prop_infos.Add (pi);
 439
 440                                 } else if (member is FieldExpr) {
 441                                         FieldExpr fe = (FieldExpr) member;
 442                                         FieldInfo fi = fe.FieldInfo;
 443
 444                                         if (fi.IsInitOnly) {
 445                                                 Error_InvalidNamedArgument (member_name);
 446                                                 return null;
 447                                         }
 448
 449                                         object value;
 450                                         if (!GetAttributeArgumentExpression (e, Location, fi.FieldType, out value))
 451                                                 return null;
 452
 453                                         field_values.Add (value);
 454
 455                                         field_infos.Add (fi);
 456                                 }
 457                         }
 458
 459                         Expression mg = Expression.MemberLookup (
 460                                 ec, Type, ".ctor", MemberTypes.Constructor,
 461                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 462                                 Location);
 463
 464                         if (mg == null) {
 465                                 Error_AttributeConstructorMismatch ();
 466                                 return null;
 467                         }
 468
 469                         MethodBase constructor = Invocation.OverloadResolve (
 470                                 ec, (MethodGroupExpr) mg, pos_args, false, Location);
 471
 472                         if (constructor == null) {
 473                                 return null;
 474                         }
 475
 476                         //
 477                         // Now we perform some checks on the positional args as they
 478                         // cannot be null for a constructor which expects a parameter
 479                         // of type object
 480                         //
 481
 482                         ParameterData pd = Invocation.GetParameterData (constructor);
 483
 484                         int group_in_params_array = Int32.MaxValue;
 485                         int pc = pd.Count;
 486                         if (pc > 0 && pd.ParameterModifier (pc-1) == Parameter.Modifier.PARAMS)
 487                                 group_in_params_array = pc-1;
 488
 489                         for (int j = 0; j < pos_arg_count; ++j) {
 490                                 Argument a = (Argument) pos_args [j];
 491
 492                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {
 493                                         Error_AttributeArgumentNotValid (Location);
 494                                         return null;
 495                                 }
 496
 497                                 if (j < group_in_params_array)
 498                                         continue;
 499
 500                                 if (j == group_in_params_array){
 501                                         object v = real_pos_values [j];
 502                                         int count = pos_arg_count - j;
 503
 504                                         object [] array = new object [count];
 505                                         real_pos_values [j] = array;
 506                                         array [0] = v;
 507                                 } else {
 508                                         object [] array = (object []) real_pos_values [group_in_params_array];
 509
 510                                         array [j - group_in_params_array] = real_pos_values [j];
 511                                 }
 512                         }
 513
 514                         //
 515                         // Adjust the size of the pos_values if it had params
 516                         //
 517                         if (group_in_params_array != Int32.MaxValue){
 518                                 int argc = group_in_params_array+1;
 519                                 object [] new_pos_values = new object [argc];
 520
 521                                 for (int p = 0; p < argc; p++)
 522                                         new_pos_values [p] = real_pos_values [p];
 523                                 real_pos_values = new_pos_values;
 524                         }
 525
 526                         try {
 527                                 if (named_args.Count > 0) {
 528                                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 529                                         field_info_arr = new FieldInfo [field_infos.Count];
 530                                         field_values_arr = new object [field_values.Count];
 531                                         prop_values_arr = new object [prop_values.Count];
 532
 533                                         field_infos.CopyTo  (field_info_arr, 0);
 534                                         field_values.CopyTo (field_values_arr, 0);
 535
 536                                         prop_values.CopyTo  (prop_values_arr, 0);
 537                                         prop_infos.CopyTo   (prop_info_arr, 0);
 538
 539                                         cb = new CustomAttributeBuilder (
 540                                                 (ConstructorInfo) constructor, real_pos_values,
 541                                                 prop_info_arr, prop_values_arr,
 542                                                 field_info_arr, field_values_arr);
 543                                 }
 544                                 else
 545                                         cb = new CustomAttributeBuilder (
 546                                                 (ConstructorInfo) constructor, real_pos_values);
 547                         } catch (NullReferenceException) {
 548                                 //
 549                                 // Don't know what to do here
 550                                 //
 551                                 Report.Warning (
 552                                         -101, Location, "NullReferenceException while trying to create attribute." +
 553                                         "Something's wrong!");
 554                         } catch (Exception e) {
 555                                 //
 556                                 // Sample:
 557                                 // using System.ComponentModel;
 558                                 // [DefaultValue (CollectionChangeAction.Add)]
 559                                 // class X { static void Main () {} }
 560                                 //
 561                                 Report.Warning (
 562                                         -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);
 563                         }
 564
 565                         return cb;
 566                 }
 567
 568                 /// <summary>
 569                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 570                 /// </summary>
 571                 public string GetValidTargets ()
 572                 {
 573                         StringBuilder sb = new StringBuilder ();
 574                         AttributeTargets targets = GetAttributeUsage ().ValidOn;
 575
 576                         if ((targets & AttributeTargets.Assembly) != 0)
 577                                 sb.Append ("'assembly' ");
 578
 579                         if ((targets & AttributeTargets.Class) != 0)
 580                                 sb.Append ("'class' ");
 581
 582                         if ((targets & AttributeTargets.Constructor) != 0)
 583                                 sb.Append ("'constructor' ");
 584
 585                         if ((targets & AttributeTargets.Delegate) != 0)
 586                                 sb.Append ("'delegate' ");
 587
 588                         if ((targets & AttributeTargets.Enum) != 0)
 589                                 sb.Append ("'enum' ");
 590
 591                         if ((targets & AttributeTargets.Event) != 0)
 592                                 sb.Append ("'event' ");
 593
 594                         if ((targets & AttributeTargets.Field) != 0)
 595                                 sb.Append ("'field' ");
 596
 597                         if ((targets & AttributeTargets.Interface) != 0)
 598                                 sb.Append ("'interface' ");
 599
 600                         if ((targets & AttributeTargets.Method) != 0)
 601                                 sb.Append ("'method' ");
 602
 603                         if ((targets & AttributeTargets.Module) != 0)
 604                                 sb.Append ("'module' ");
 605
 606                         if ((targets & AttributeTargets.Parameter) != 0)
 607                                 sb.Append ("'parameter' ");
 608
 609                         if ((targets & AttributeTargets.Property) != 0)
 610                                 sb.Append ("'property' ");
 611
 612                         if ((targets & AttributeTargets.ReturnValue) != 0)
 613                                 sb.Append ("'return' ");
 614
 615                         if ((targets & AttributeTargets.Struct) != 0)
 616                                 sb.Append ("'struct' ");
 617
 618                         return sb.ToString ();
 619
 620                 }
 621
 622                 /// <summary>
 623                 /// Returns AttributeUsage attribute for this type
 624                 /// </summary>
 625                 public AttributeUsageAttribute GetAttributeUsage ()
 626                 {
 627                         AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
 628                         if (ua != null)
 629                                 return ua;
 630
 631                         Class attr_class = TypeManager.LookupClass (Type);
 632
 633                         if (attr_class == null) {
 634                                 object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 635                                 ua = (AttributeUsageAttribute)usage_attr [0];
 636                                 usage_attr_cache.Add (Type, ua);
 637                                 return ua;
 638                         }
 639
 640                         return attr_class.AttributeUsage;
 641                 }
 642
 643                 /// <summary>
 644                 /// Returns custom name of indexer
 645                 /// </summary>
 646                 public string GetIndexerAttributeValue (EmitContext ec)
 647                 {
 648                         if (pos_values == null) {
 649                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 650                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 651                                 Resolve (ec);
 652                         }
 653
 654                         return pos_values [0] as string;
 655                 }
 656
 657                 /// <summary>
 658                 /// Returns condition of ConditionalAttribute
 659                 /// </summary>
 660                 public string GetConditionalAttributeValue (DeclSpace ds)
 661                 {
 662                         if (pos_values == null) {
 663                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 664
 665                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 666                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 667                                 Resolve (ec);
 668                         }
 669
 670                         // Some error occurred
 671                         if (pos_values [0] == null)
 672                                 return null;
 673
 674                         return (string)pos_values [0];
 675                 }
 676
 677                 /// <summary>
 678                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 679                 /// </summary>
 680                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 681                 {
 682                         if (pos_values == null) {
 683                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 684
 685                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 686                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 687                                 Resolve (ec);
 688                         }
 689
 690                         // Some error occurred
 691                         if (pos_values == null)
 692                                 return null;
 693
 694                         if (pos_values.Length == 0)
 695                                 return new ObsoleteAttribute ();
 696
 697                         if (pos_values.Length == 1)
 698                                 return new ObsoleteAttribute ((string)pos_values [0]);
 699
 700                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 701                 }
 702
 703                 /// <summary>
 704                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 705                 /// before ApplyAttribute. We need to resolve the arguments.
 706                 /// This situation occurs when class deps is differs from Emit order.
 707                 /// </summary>
 708                 public bool GetClsCompliantAttributeValue (DeclSpace ds)
 709                 {
 710                         if (pos_values == null) {
 711                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 712
 713                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 714                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 715                                 Resolve (ec);
 716                         }
 717
 718                         // Some error occurred
 719                         if (pos_values [0] == null)
 720                                 return false;
 721
 722                         return (bool)pos_values [0];
 723                 }
 724
 725                 object GetValue (object value)
 726                 {
 727                         if (value is EnumConstant)
 728                                 return ((EnumConstant) value).GetValue ();
 729                         else
 730                                 return value;
 731                 }
 732
 733                 public object GetPositionalValue (int i)
 734                 {
 735                         return (pos_values == null) ? null : pos_values[i];
 736                 }
 737
 738                 object GetFieldValue (string name)
 739                 {
 740                         int i;
 741                         if (field_info_arr == null)
 742                                 return null;
 743                         i = 0;
 744                         foreach (FieldInfo fi in field_info_arr) {
 745                                 if (fi.Name == name)
 746                                         return GetValue (field_values_arr [i]);
 747                                 i++;
 748                         }
 749                         return null;
 750                 }
 751
 752                 public UnmanagedMarshal GetMarshal ()
 753                 {
 754                         object o = GetFieldValue ("ArraySubType");
 755                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;
 756
 757                         switch (UnmanagedType) {
 758                         case UnmanagedType.CustomMarshaler:
 759                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
 760                                                                        BindingFlags.Static | BindingFlags.Public);
 761                                 if (define_custom == null)
 762                                         return null;
 763
 764                                 object [] args = new object [4];
 765                                 args [0] = GetFieldValue ("MarshalTypeRef");
 766                                 args [1] = GetFieldValue ("MarshalCookie");
 767                                 args [2] = GetFieldValue ("MarshalType");
 768                                 args [3] = Guid.Empty;
 769                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
 770
 771                         case UnmanagedType.LPArray:
 772                                 return UnmanagedMarshal.DefineLPArray (array_sub_type);
 773
 774                         case UnmanagedType.SafeArray:
 775                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
 776
 777                         case UnmanagedType.ByValArray:
 778                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
 779
 780                         case UnmanagedType.ByValTStr:
 781                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
 782
 783                         default:
 784                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
 785                         }
 786                 }
 787
 788                 public bool IsInternalCall
 789                 {
 790                         get { return ImplOptions == MethodImplOptions.InternalCall; }
 791                 }
 792
 793                 /// <summary>
 794                 /// Emit attribute for Attributable symbol
 795                 /// </summary>
 796                 public void Emit (EmitContext ec, Attributable ias, ListDictionary emitted_attr)
 797                 {
 798                         CustomAttributeBuilder cb = Resolve (ec);
 799                         if (cb == null)
 800                                 return;
 801
 802                         AttributeUsageAttribute usage_attr = GetAttributeUsage ();
 803                         if ((usage_attr.ValidOn & Target) == 0) {
 804                                 Report.Error (592, Location, "Attribute '{0}' is not valid on this declaration type. It is valid on {1} declarations only.", Name, GetValidTargets ());
 805                                 return;
 806                         }
 807
 808                         ias.ApplyAttributeBuilder (this, cb);
 809
 810                         if (!usage_attr.AllowMultiple) {
 811                                 ArrayList emitted_targets = (ArrayList)emitted_attr [Type];
 812                                 if (emitted_targets == null) {
 813                                         emitted_targets = new ArrayList ();
 814                                         emitted_attr.Add (Type, emitted_targets);
 815                                 } else if (emitted_targets.Contains (Target)) {
 816                                 Report.Error (579, Location, "Duplicate '" + Name + "' attribute");
 817                                         return;
 818                                 }
 819                                 emitted_targets.Add (Target);
 820                         }
 821
 822                         if (!RootContext.VerifyClsCompliance)
 823                                 return;
 824
 825                         // Here we are testing attribute arguments for array usage (error 3016)
 826                         if (ias.IsClsCompliaceRequired (ec.DeclSpace)) {
 827                                 if (Arguments == null)
 828                                         return;
 829
 830                                 ArrayList pos_args = (ArrayList) Arguments [0];
 831                                 if (pos_args != null) {
 832                                         foreach (Argument arg in pos_args) {
 833                                                 // Type is undefined (was error 246)
 834                                                 if (arg.Type == null)
 835                                                         return;
 836
 837                                                 if (arg.Type.IsArray) {
 838                                                         Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 839                                                         return;
 840                                                 }
 841                                         }
 842                                 }
 843
 844                                 if (Arguments.Count < 2)
 845                                         return;
 846
 847                                 ArrayList named_args = (ArrayList) Arguments [1];
 848                                 foreach (DictionaryEntry de in named_args) {
 849                                         Argument arg  = (Argument) de.Value;
 850
 851                                         // Type is undefined (was error 246)
 852                                         if (arg.Type == null)
 853                                                 return;
 854
 855                                         if (arg.Type.IsArray) {
 856                                                 Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 857                                                 return;
 858                                         }
 859                                 }
 860                         }
 861                 }
 862
 863                 public object GetValue (EmitContext ec, Constant c, Type target)
 864                 {
 865                         if (Convert.ImplicitConversionExists (ec, c, target))
 866                                 return c.GetValue ();
 867
 868                         Convert.Error_CannotImplicitConversion (Location, c.Type, target);
 869                         return null;
 870                 }
 871
 872                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,
 873                                                           MethodAttributes flags, Type ret_type, Type [] param_types)
 874                 {
 875                         //
 876                         // We extract from the attribute the information we need
 877                         //
 878
 879                         if (Arguments == null) {
 880                                 Console.WriteLine ("Internal error : this is not supposed to happen !");
 881                                 return null;
 882                         }
 883
 884                         ResolveType (ec, true);
 885                         if (Type == null)
 886                                 return null;
 887
 888                         ArrayList named_args = new ArrayList ();
 889
 890                         ArrayList pos_args = (ArrayList) Arguments [0];
 891                         if (Arguments.Count > 1)
 892                                 named_args = (ArrayList) Arguments [1];
 893
 894
 895                         string dll_name = null;
 896
 897                         Argument tmp = (Argument) pos_args [0];
 898
 899                         if (!tmp.Resolve (ec, Location))
 900                                 return null;
 901
 902                         if (tmp.Expr is Constant)
 903                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();
 904                         else {
 905                                 Error_AttributeArgumentNotValid (Location);
 906                                 return null;
 907                         }
 908
 909                         // Now we process the named arguments
 910                         CallingConvention cc = CallingConvention.Winapi;
 911                         CharSet charset = CharSet.Ansi;
 912                         bool preserve_sig = true;
 913 #if FIXME
 914                         bool exact_spelling = false;
 915 #endif
 916                         bool set_last_err = false;
 917                         string entry_point = null;
 918
 919                         for (int i = 0; i < named_args.Count; i++) {
 920
 921                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 922
 923                                 string member_name = (string) de.Key;
 924                                 Argument a  = (Argument) de.Value;
 925
 926                                 if (!a.Resolve (ec, Location))
 927                                         return null;
 928
 929                                 Expression member = Expression.MemberLookup (
 930                                         ec, Type, member_name,
 931                                         MemberTypes.Field | MemberTypes.Property,
 932                                         BindingFlags.Public | BindingFlags.Instance,
 933                                         Location);
 934
 935                                 if (member == null || !(member is FieldExpr)) {
 936                                         Error_InvalidNamedArgument (member_name);
 937                                         return null;
 938                                 }
 939
 940                                 if (member is FieldExpr) {
 941                                         FieldExpr fe = (FieldExpr) member;
 942                                         FieldInfo fi = fe.FieldInfo;
 943
 944                                         if (fi.IsInitOnly) {
 945                                                 Error_InvalidNamedArgument (member_name);
 946                                                 return null;
 947                                         }
 948
 949                                         if (a.Expr is Constant) {
 950                                                 Constant c = (Constant) a.Expr;
 951
 952                                                 try {
 953                                                         if (member_name == "CallingConvention"){
 954                                                                 object val = GetValue (ec, c, typeof (CallingConvention));
 955                                                                 if (val == null)
 956                                                                         return null;
 957                                                                 cc = (CallingConvention) val;
 958                                                         } else if (member_name == "CharSet"){
 959                                                                 charset = (CharSet) c.GetValue ();
 960                                                         } else if (member_name == "EntryPoint")
 961                                                                 entry_point = (string) c.GetValue ();
 962                                                         else if (member_name == "SetLastError")
 963                                                                 set_last_err = (bool) c.GetValue ();
 964 #if FIXME
 965                                                         else if (member_name == "ExactSpelling")
 966                                                                 exact_spelling = (bool) c.GetValue ();
 967 #endif
 968                                                         else if (member_name == "PreserveSig")
 969                                                                 preserve_sig = (bool) c.GetValue ();
 970                                                 } catch (InvalidCastException){
 971                                                         Error_InvalidNamedArgument (member_name);
 972                                                         Error_AttributeArgumentNotValid (Location);
 973                                                 }
 974                                         } else {
 975                                                 Error_AttributeArgumentNotValid (Location);
 976                                                 return null;
 977                                         }
 978
 979                                 }
 980                         }
 981
 982                         if (entry_point == null)
 983                                 entry_point = name;
 984                         if (set_last_err)
 985                                 charset = (CharSet)((int)charset | 0x40);
 986
 987                         MethodBuilder mb = builder.DefinePInvokeMethod (
 988                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,
 989                                 CallingConventions.Standard,
 990                                 ret_type,
 991                                 param_types,
 992                                 cc,
 993                                 charset);
 994
 995                         if (preserve_sig)
 996                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);
 997
 998                         return mb;
 999                 }
1000
1001                 private Expression GetValue ()
1002                 {
1003                         if ((Arguments == null) || (Arguments.Count < 1))
1004                                 return null;
1005                         ArrayList al = (ArrayList) Arguments [0];
1006                         if ((al == null) || (al.Count < 1))
1007                                 return null;
1008                         Argument arg = (Argument) al [0];
1009                         if ((arg == null) || (arg.Expr == null))
1010                                 return null;
1011                         return arg.Expr;
1012                 }
1013
1014                 public string GetString ()
1015                 {
1016                         Expression e = GetValue ();
1017                         if (e is StringLiteral)
1018                                 return (e as StringLiteral).Value;
1019                         return null;
1020                 }
1021
1022                 public bool GetBoolean ()
1023                 {
1024                         Expression e = GetValue ();
1025                         if (e is BoolLiteral)
1026                                 return (e as BoolLiteral).Value;
1027                         return false;
1028                 }
1029         }
1030
1031
1032         /// <summary>
1033         /// For global attributes (assembly, module) we need special handling.
1034         /// Attributes can be located in the several files
1035         /// </summary>
1036         public class GlobalAttribute: Attribute
1037         {
1038                 public readonly NamespaceEntry ns;
1039
1040                 public GlobalAttribute (TypeContainer container, string target, string name, ArrayList args, Location loc):
1041                         base (target, name, args, loc)
1042                 {
1043                         ns = container.NamespaceEntry;
1044                 }
1045
1046                 protected override Type CheckAttributeType (EmitContext ec, bool complain)
1047                 {
1048                         NamespaceEntry old = ec.DeclSpace.NamespaceEntry;
1049                         if (old == null || old.NS == null || old.NS == Namespace.Root)
1050                                 ec.DeclSpace.NamespaceEntry = ns;
1051                         return base.CheckAttributeType (ec, complain);
1052                 }
1053         }
1054
1055         public class Attributes {
1056                 public ArrayList Attrs;
1057
1058                 public Attributes (Attribute a)
1059                 {
1060                         Attrs = new ArrayList ();
1061                         Attrs.Add (a);
1062                 }
1063
1064                 public Attributes (ArrayList attrs)
1065                 {
1066                         Attrs = attrs;
1067                 }
1068
1069                 public void AddAttributes (ArrayList attrs)
1070                 {
1071                         Attrs.AddRange (attrs);
1072                 }
1073
1074                 /// <summary>
1075                 /// Checks whether attribute target is valid for the current element
1076                 /// </summary>
1077                 public void CheckTargets (Attributable member)
1078                 {
1079                         string[] valid_targets = member.ValidAttributeTargets;
1080                         foreach (Attribute a in Attrs) {
1081                                 if (a.ExplicitTarget == null || a.ExplicitTarget == valid_targets [0]) {
1082                                         a.Target = member.AttributeTargets;
1083                                         continue;
1084                                 }
1085
1086                                 // TODO: we can skip the first item
1087                                 if (((IList) valid_targets).Contains (a.ExplicitTarget)) {
1088                                         switch (a.ExplicitTarget) {
1089                                                 case "return": a.Target = AttributeTargets.ReturnValue; continue;
1090                                                 case "param": a.Target = AttributeTargets.Parameter; continue;
1091                                                 case "field": a.Target = AttributeTargets.Field; continue;
1092                                                 case "method": a.Target = AttributeTargets.Method; continue;
1093                                                 case "property": a.Target = AttributeTargets.Property; continue;
1094                                         }
1095                                         throw new InternalErrorException ("Unknown explicit target: " + a.ExplicitTarget);
1096                                 }
1097
1098                                 StringBuilder sb = new StringBuilder ();
1099                                 foreach (string s in valid_targets) {
1100                                         sb.Append (s);
1101                                         sb.Append (", ");
1102                                 }
1103                                 sb.Remove (sb.Length - 2, 2);
1104                                 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 ());
1105                         }
1106                 }
1107
1108                 private Attribute Search (Type t, EmitContext ec, bool complain)
1109                 {
1110                         foreach (Attribute a in Attrs) {
1111                                 if (a.ResolveType (ec, complain) == t)
1112                                         return a;
1113                         }
1114                         return null;
1115                 }
1116
1117                 public Attribute Search (Type t, EmitContext ec)
1118                 {
1119                         return Search (t, ec, true);
1120                 }
1121
1122                 /// <summary>
1123                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1124                 /// </summary>
1125                 public Attribute[] SearchMulti (Type t, EmitContext ec)
1126                 {
1127                         ArrayList ar = null;
1128
1129                         foreach (Attribute a in Attrs) {
1130                                 if (a.ResolveType (ec, false) == t) {
1131                                         if (ar == null)
1132                                                 ar = new ArrayList ();
1133                                         ar.Add (a);
1134                                 }
1135                         }
1136
1137                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1138                 }
1139
1140                 public void Emit (EmitContext ec, Attributable ias)
1141                 {
1142                         ListDictionary ld = new ListDictionary ();
1143
1144                         foreach (Attribute a in Attrs)
1145                                 a.Emit (ec, ias, ld);
1146                 }
1147
1148                 public bool Contains (Type t, EmitContext ec)
1149                 {
1150                         return Search (t, ec) != null;
1151                 }
1152
1153                 public Attribute GetClsCompliantAttribute (EmitContext ec)
1154                 {
1155                         return Search (TypeManager.cls_compliant_attribute_type, ec, false);
1156                 }
1157
1158                 /// <summary>
1159                 /// Pulls the IndexerName attribute from an Indexer if it exists.
1160                 /// </summary>
1161                 public Attribute GetIndexerNameAttribute (EmitContext ec)
1162                 {
1163                         Attribute a = Search (TypeManager.indexer_name_type, ec, false);
1164                         if (a == null)
1165                                 return null;
1166
1167                         // Remove the attribute from the list because it is not emitted
1168                         Attrs.Remove (a);
1169                         return a;
1170                 }
1171
1172         }
1173
1174         /// <summary>
1175         /// Helper class for attribute verification routine.
1176         /// </summary>
1177         sealed class AttributeTester
1178         {
1179                 static PtrHashtable analyzed_types = new PtrHashtable ();
1180                 static PtrHashtable analyzed_types_obsolete = new PtrHashtable ();
1181                 static PtrHashtable analyzed_member_obsolete = new PtrHashtable ();
1182                 static PtrHashtable analyzed_method_excluded = new PtrHashtable ();
1183
1184                 private AttributeTester ()
1185                 {
1186                 }
1187
1188                 /// <summary>
1189                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1190                 /// It tests differing only in ref or out, or in array rank.
1191                 /// </summary>
1192                 public static bool AreOverloadedMethodParamsClsCompliant (Type[] types_a, Type[] types_b)
1193                 {
1194                         if (types_a == null || types_b == null)
1195                                 return true;
1196
1197                         if (types_a.Length != types_b.Length)
1198                                 return true;
1199
1200                         for (int i = 0; i < types_b.Length; ++i) {
1201                                 Type aType = types_a [i];
1202                                 Type bType = types_b [i];
1203
1204                                 if (aType.IsArray && bType.IsArray && aType.GetArrayRank () != bType.GetArrayRank () && aType.GetElementType () == bType.GetElementType ()) {
1205                                         return false;
1206                                 }
1207
1208                                 Type aBaseType = aType;
1209                                 bool is_either_ref_or_out = false;
1210
1211                                 if (aType.IsByRef || aType.IsPointer) {
1212                                         aBaseType = aType.GetElementType ();
1213                                         is_either_ref_or_out = true;
1214                                 }
1215
1216                                 Type bBaseType = bType;
1217                                 if (bType.IsByRef || bType.IsPointer)
1218                                 {
1219                                         bBaseType = bType.GetElementType ();
1220                                         is_either_ref_or_out = !is_either_ref_or_out;
1221                                 }
1222
1223                                 if (aBaseType != bBaseType)
1224                                         continue;
1225
1226                                 if (is_either_ref_or_out)
1227                                         return false;
1228                         }
1229                         return true;
1230                 }
1231
1232                 /// <summary>
1233                 /// Goes through all parameters and test if they are CLS-Compliant.
1234                 /// </summary>
1235                 public static bool AreParametersCompliant (Parameter[] fixedParameters, Location loc)
1236                 {
1237                         if (fixedParameters == null)
1238                                 return true;
1239
1240                         foreach (Parameter arg in fixedParameters) {
1241                                 if (!AttributeTester.IsClsCompliant (arg.ParameterType)) {
1242                                         Report.Error (3001, loc, "Argument type '{0}' is not CLS-compliant", arg.GetSignatureForError ());
1243                                         return false;
1244                                 }
1245                         }
1246                         return true;
1247                 }
1248
1249
1250                 /// <summary>
1251                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1252                 /// </summary>
1253                 public static bool IsClsCompliant (Type type)
1254                 {
1255                         if (type == null)
1256                                 return true;
1257
1258                         object type_compliance = analyzed_types[type];
1259                         if (type_compliance != null)
1260                                 return type_compliance == TRUE;
1261
1262                         if (type.IsPointer) {
1263                                 analyzed_types.Add (type, null);
1264                                 return false;
1265                         }
1266
1267                         bool result;
1268                         if (type.IsArray || type.IsByRef)       {
1269                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1270                         } else {
1271                                 result = AnalyzeTypeCompliance (type);
1272                         }
1273                         analyzed_types.Add (type, result ? TRUE : FALSE);
1274                         return result;
1275                 }
1276
1277                 static object TRUE = new object ();
1278                 static object FALSE = new object ();
1279
1280                 public static void VerifyModulesClsCompliance ()
1281                 {
1282                         Module[] modules = TypeManager.Modules;
1283                         if (modules == null)
1284                                 return;
1285
1286                         // The first module is generated assembly
1287                         for (int i = 1; i < modules.Length; ++i) {
1288                                 Module module = modules [i];
1289                                 if (!IsClsCompliant (module)) {
1290                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute to match the assembly", module.Name);
1291                                         return;
1292                                 }
1293                         }
1294                 }
1295
1296                 /// <summary>
1297                 /// Tests container name for CLS-Compliant name (differing only in case)
1298                 /// </summary>
1299                 public static void VerifyTopLevelNameClsCompliance ()
1300                 {
1301                         Hashtable locase_table = new Hashtable ();
1302
1303                         // Convert imported type names to lower case and ignore not cls compliant
1304                         foreach (DictionaryEntry de in TypeManager.all_imported_types) {
1305                                 Type t = (Type)de.Value;
1306                                 if (!AttributeTester.IsClsCompliant (t))
1307                                         continue;
1308
1309                                 locase_table.Add (((string)de.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture), t);
1310                         }
1311
1312                         foreach (DictionaryEntry de in RootContext.Tree.Decls) {
1313                                 DeclSpace decl = (DeclSpace)de.Value;
1314                                 if (!decl.IsClsCompliaceRequired (decl))
1315                                         continue;
1316
1317                                 string lcase = decl.Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1318                                 if (!locase_table.Contains (lcase)) {
1319                                         locase_table.Add (lcase, decl);
1320                                         continue;
1321                                 }
1322
1323                                 object conflict = locase_table [lcase];
1324                                 if (conflict is Type)
1325                                         Report.SymbolRelatedToPreviousError ((Type)conflict);
1326                                 else
1327                                         Report.SymbolRelatedToPreviousError ((MemberCore)conflict);
1328
1329                                 Report.Error (3005, decl.Location, "Identifier '{0}' differing only in case is not CLS-compliant", decl.GetSignatureForError ());
1330                         }
1331                 }
1332
1333                 static bool IsClsCompliant (ICustomAttributeProvider attribute_provider)
1334                 {
1335                         object[] CompliantAttribute = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1336                         if (CompliantAttribute.Length == 0)
1337                                 return false;
1338
1339                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1340                 }
1341
1342                 static bool AnalyzeTypeCompliance (Type type)
1343                 {
1344                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1345                         if (ds != null) {
1346                                 return ds.IsClsCompliaceRequired (ds.Parent);
1347                         }
1348
1349                         if (type.IsGenericParameter)
1350                                 return false;
1351
1352                         object[] CompliantAttribute = type.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1353                         if (CompliantAttribute.Length == 0)
1354                                 return IsClsCompliant (type.Assembly);
1355
1356                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1357                 }
1358
1359                 /// <summary>
1360                 /// Returns instance of ObsoleteAttribute when type is obsolete
1361                 /// </summary>
1362                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1363                 {
1364                         object type_obsolete = analyzed_types_obsolete [type];
1365                         if (type_obsolete == FALSE)
1366                                 return null;
1367
1368                         if (type_obsolete != null)
1369                                 return (ObsoleteAttribute)type_obsolete;
1370
1371                         ObsoleteAttribute result = null;
1372                         if (type.IsByRef || type.IsArray || type.IsPointer) {
1373                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1374                         } else if (type.IsGenericParameter || type.IsGenericInstance)
1375                                 return null;
1376                         else {
1377                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1378
1379                                 // Type is external, we can get attribute directly
1380                                 if (type_ds == null) {
1381                                         object[] attribute = type.GetCustomAttributes (TypeManager.obsolete_attribute_type, false);
1382                                         if (attribute.Length == 1)
1383                                                 result = (ObsoleteAttribute)attribute [0];
1384                                 } else {
1385                                         result = type_ds.GetObsoleteAttribute (type_ds);
1386                                 }
1387                         }
1388
1389                         analyzed_types_obsolete.Add (type, result == null ? FALSE : result);
1390                         return result;
1391                 }
1392
1393                 /// <summary>
1394                 /// Returns instance of ObsoleteAttribute when method is obsolete
1395                 /// </summary>
1396                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1397                 {
1398                         IMethodData mc = TypeManager.GetMethod (mb);
1399                         if (mc != null)
1400                                 return mc.GetObsoleteAttribute ();
1401
1402                         // compiler generated methods are not registered by AddMethod
1403                         if (mb.DeclaringType is TypeBuilder)
1404                                 return null;
1405
1406                         return GetMemberObsoleteAttribute (mb);
1407                 }
1408
1409                 /// <summary>
1410                 /// Returns instance of ObsoleteAttribute when member is obsolete
1411                 /// </summary>
1412                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1413                 {
1414                         object type_obsolete = analyzed_member_obsolete [mi];
1415                         if (type_obsolete == FALSE)
1416                                 return null;
1417
1418                         if (type_obsolete != null)
1419                                 return (ObsoleteAttribute)type_obsolete;
1420
1421                         if ((mi.DeclaringType is TypeBuilder) || mi.DeclaringType.IsGenericInstance)
1422                                 return null;
1423
1424                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false) as ObsoleteAttribute;
1425                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1426                         return oa;
1427                 }
1428
1429                 /// <summary>
1430                 /// Common method for Obsolete error/warning reporting.
1431                 /// </summary>
1432                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1433                 {
1434                         if (oa.IsError) {
1435                                 Report.Error (619, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1436                                 return;
1437                         }
1438
1439                         if (oa.Message == null) {
1440                                 Report.Warning (612, loc, "'{0}' is obsolete", member);
1441                                 return;
1442                         }
1443                         if (RootContext.WarningLevel >= 2)
1444                                 Report.Warning (618, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1445                 }
1446
1447                 public static bool IsConditionalMethodExcluded (MethodBase mb)
1448                 {
1449                         object excluded = analyzed_method_excluded [mb];
1450                         if (excluded != null)
1451                                 return excluded == TRUE ? true : false;
1452
1453                         if (mb.Mono_IsInflatedMethod)
1454                                 return false;
1455
1456                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (TypeManager.conditional_attribute_type, true) as ConditionalAttribute[];
1457                         if (attrs.Length == 0) {
1458                                 analyzed_method_excluded.Add (mb, FALSE);
1459                                 return false;
1460                         }
1461
1462                         foreach (ConditionalAttribute a in attrs) {
1463                                 if (RootContext.AllDefines.Contains (a.ConditionString)) {
1464                                         analyzed_method_excluded.Add (mb, FALSE);
1465                                         return false;
1466                                 }
1467                         }
1468                         analyzed_method_excluded.Add (mb, TRUE);
1469                         return true;
1470                 }
1471         }
1472 }