mcs/mcs/attribute.cs

   1 //
   2 // attribute.cs: Attribute Handler
   3 //
   4 // Author: Ravi Pratap (ravi@ximian.com)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // 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.Security;
  22 using System.Security.Permissions;
  23 using System.Text;
  24
  25 namespace Mono.CSharp {
  26
  27         /// <summary>
  28         ///   Base class for objects that can have Attributes applied to them.
  29         /// </summary>
  30         public abstract class Attributable {
  31                 /// <summary>
  32                 ///   Attributes for this type
  33                 /// </summary>
  34                 Attributes attributes;
  35
  36                 public Attributable (Attributes attrs)
  37                 {
  38                         attributes = attrs;
  39                 }
  40
  41                 public Attributes OptAttributes
  42                 {
  43                         get {
  44                                 return attributes;
  45                         }
  46                         set {
  47                                 attributes = value;
  48                         }
  49                 }
  50
  51                 /// <summary>
  52                 /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
  53                 /// </summary>
  54                 public abstract void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb);
  55
  56                 /// <summary>
  57                 /// Returns one AttributeTarget for this element.
  58                 /// </summary>
  59                 public abstract AttributeTargets AttributeTargets { get; }
  60
  61                 public abstract bool IsClsCompliaceRequired (DeclSpace ds);
  62
  63                 /// <summary>
  64                 /// Gets list of valid attribute targets for explicit target declaration.
  65                 /// The first array item is default target. Don't break this rule.
  66                 /// </summary>
  67                 public abstract string[] ValidAttributeTargets { get; }
  68         };
  69
  70         public class Attribute {
  71                 public readonly string ExplicitTarget;
  72                 public AttributeTargets Target;
  73
  74                 public readonly string    Name;
  75                 public readonly ArrayList Arguments;
  76
  77                 public readonly Location Location;
  78
  79                 public Type Type;
  80
  81                 bool resolve_error;
  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, "Invalid attribute argument: '{0}'.  Argument must be fields " +
 116                                       "fields which are not readonly, static or const;  or read-write instance properties.",
 117                                       Name);
 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                 /// <summary>
 128                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 129                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 130                 /// </summary>
 131                 public void Error_AttributeEmitError (string inner)
 132                 {
 133                         Report.Error (647, Location, "Error emitting '{0}' attribute because '{1}'", Name, inner);
 134                 }
 135
 136                 public void Error_InvalidSecurityParent ()
 137                 {
 138                         Error_AttributeEmitError ("it is attached to invalid parent");
 139                 }
 140
 141                 void Error_AttributeConstructorMismatch ()
 142                 {
 143                         Report.Error (-6, Location,
 144                                       "Could not find a constructor for this argument list.");
 145                 }
 146
 147                 /// <summary>
 148                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 149                 /// </summary>
 150                 protected virtual Type CheckAttributeType (EmitContext ec)
 151                 {
 152                         string NameAttribute = Name + "Attribute";
 153
 154                         Type t1 = ec.ResolvingTypeTree
 155                                 ? ec.DeclSpace.FindType (Location, Name)
 156                                 : RootContext.LookupType (ec.DeclSpace, Name, true, Location);
 157
 158                         // FIXME: Shouldn't do this for quoted attributes: [@A]
 159                         Type t2 = ec.ResolvingTypeTree
 160                                 ? ec.DeclSpace.FindType (Location, NameAttribute)
 161                                 : RootContext.LookupType (ec.DeclSpace, NameAttribute, true, Location);
 162
 163                         String err0616 = null;
 164
 165                         if (t1 != null && ! t1.IsSubclassOf (TypeManager.attribute_type)) {
 166                                 t1 = null;
 167                                 err0616 = "'" + Name + "': is not an attribute class";
 168                         }
 169                         if (t2 != null && ! t2.IsSubclassOf (TypeManager.attribute_type)) {
 170                                 t2 = null;
 171                                 err0616 = (err0616 != null)
 172                                         ? "Neither '" + Name + "' nor '" + NameAttribute +"' is an attribute class"
 173                                         : "'" + Name + "Attribute': is not an attribute class";
 174                         }
 175
 176                         if (t1 != null && t2 != null) {
 177                                 Report.Error(1614, Location, "'" + Name + "': is ambiguous; "
 178                                              + " use either '@" + Name + "' or '" + NameAttribute + "'");
 179                                 return null;
 180                         }
 181                         if (t1 != null)
 182                                 return t1;
 183                         if (t2 != null)
 184                                 return t2;
 185
 186                         if (err0616 != null) {
 187                                 Report.Error (616, Location, err0616);
 188                                 return null;
 189                         }
 190
 191                         Report.Error (246, Location,
 192                                       "Could not find attribute '" + Name
 193                                       + "' (are you missing a using directive or an assembly reference ?)");
 194
 195                         return null;
 196                 }
 197
 198                 public Type ResolveType (EmitContext ec)
 199                 {
 200                         if (Type == null)
 201                                 Type = CheckAttributeType (ec);
 202                         return Type;
 203                 }
 204
 205                 /// <summary>
 206                 ///   Validates the guid string
 207                 /// </summary>
 208                 bool ValidateGuid (string guid)
 209                 {
 210                         try {
 211                                 new Guid (guid);
 212                                 return true;
 213                         } catch {
 214                                 Report.Error (647, Location, "Format of GUID is invalid: " + guid);
 215                                 return false;
 216                         }
 217                 }
 218
 219                 string GetFullMemberName (string member)
 220                 {
 221                         return Type.FullName + '.' + member;
 222                 }
 223
 224                 //
 225                 // Given an expression, if the expression is a valid attribute-argument-expression
 226                 // returns an object that can be used to encode it, or null on failure.
 227                 //
 228                 public static bool GetAttributeArgumentExpression (Expression e, Location loc, Type arg_type, out object result)
 229                 {
 230                         if (e is EnumConstant) {
 231                                 if (RootContext.StdLib)
 232                                         result = ((EnumConstant)e).GetValueAsEnumType ();
 233                                 else
 234                                         result = ((EnumConstant)e).GetValue ();
 235
 236                                 return true;
 237                         }
 238
 239                         Constant constant = e as Constant;
 240                         if (constant != null) {
 241                                 if (e.Type != arg_type) {
 242                                         constant = Const.ChangeType (loc, constant, arg_type);
 243                                         if (constant == null) {
 244                                                 result = null;
 245                                                 Error_AttributeArgumentNotValid (loc);
 246                                                 return false;
 247                                         }
 248                                 }
 249                                 result = constant.GetValue ();
 250                                 return true;
 251                         } else if (e is TypeOf) {
 252                                 result = ((TypeOf) e).TypeArg;
 253                                 return true;
 254                         } else if (e is ArrayCreation){
 255                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();
 256                                 if (result != null)
 257                                         return true;
 258                         } else if (e is EmptyCast) {
 259                                 Expression child = ((EmptyCast)e).Child;
 260                                 return GetAttributeArgumentExpression (child, loc, child.Type, out result);
 261                         }
 262
 263                         result = null;
 264                         Error_AttributeArgumentNotValid (loc);
 265                         return false;
 266                 }
 267
 268                 public CustomAttributeBuilder Resolve (EmitContext ec)
 269                 {
 270                         if (resolve_error)
 271                                 return null;
 272
 273                         resolve_error = true;
 274
 275                         Type oldType = Type;
 276
 277                         // Sanity check.
 278                         Type = CheckAttributeType (ec);
 279
 280                         if (oldType == null && Type == null)
 281                                 return null;
 282                         if (oldType != null && oldType != Type){
 283                                 Report.Error (-27, Location,
 284                                               "Attribute {0} resolved to different types at different times: {1} vs. {2}",
 285                                               Name, oldType, Type);
 286                                 return null;
 287                         }
 288
 289                         if (Type.IsAbstract) {
 290                                 Report.Error (653, Location, "Cannot apply attribute class '{0}' because it is abstract", Name);
 291                                 return null;
 292                         }
 293
 294                         bool MethodImplAttr = false;
 295                         bool MarshalAsAttr = false;
 296                         bool GuidAttr = false;
 297                         bool usage_attr = false;
 298
 299                         bool DoCompares = true;
 300
 301                         //
 302                         // If we are a certain special attribute, we
 303                         // set the information accordingly
 304                         //
 305
 306                         if (Type == TypeManager.attribute_usage_type)
 307                                 usage_attr = true;
 308                         else if (Type == TypeManager.methodimpl_attr_type)
 309                                 MethodImplAttr = true;
 310                         else if (Type == TypeManager.marshal_as_attr_type)
 311                                 MarshalAsAttr = true;
 312                         else if (Type == TypeManager.guid_attr_type)
 313                                 GuidAttr = true;
 314                         else
 315                                 DoCompares = false;
 316
 317                         // Now we extract the positional and named arguments
 318
 319                         ArrayList pos_args = new ArrayList ();
 320                         ArrayList named_args = new ArrayList ();
 321                         int pos_arg_count = 0;
 322
 323                         if (Arguments != null) {
 324                                 pos_args = (ArrayList) Arguments [0];
 325                                 if (pos_args != null)
 326                                         pos_arg_count = pos_args.Count;
 327                                 if (Arguments.Count > 1)
 328                                         named_args = (ArrayList) Arguments [1];
 329                         }
 330
 331                         pos_values = new object [pos_arg_count];
 332
 333                         //
 334                         // First process positional arguments
 335                         //
 336
 337                         int i;
 338                         for (i = 0; i < pos_arg_count; i++) {
 339                                 Argument a = (Argument) pos_args [i];
 340                                 Expression e;
 341
 342                                 if (!a.Resolve (ec, Location))
 343                                         return null;
 344
 345                                 e = a.Expr;
 346
 347                                 object val;
 348                                 if (!GetAttributeArgumentExpression (e, Location, a.Type, out val))
 349                                         return null;
 350
 351                                 pos_values [i] = val;
 352
 353                                 if (DoCompares){
 354                                         if (usage_attr) {
 355                                                 if ((int)val == 0) {
 356                                                         Report.Error (591, Location, "Invalid value for argument to 'System.AttributeUsage' attribute");
 357                                                         return null;
 358                                                 }
 359                                                 usage_attribute = new AttributeUsageAttribute ((AttributeTargets)val);
 360                                         } else if (MethodImplAttr) {
 361                                                 this.ImplOptions = (MethodImplOptions) val;
 362                                         } else if (GuidAttr){
 363                                                 //
 364                                                 // we will later check the validity of the type
 365                                                 //
 366                                                 if (val is string){
 367                                                         if (!ValidateGuid ((string) val))
 368                                                                 return null;
 369                                                 }
 370
 371                                         } else if (MarshalAsAttr)
 372                                                 this.UnmanagedType =
 373                                                 (System.Runtime.InteropServices.UnmanagedType) val;
 374                                 }
 375                         }
 376
 377                         //
 378                         // Now process named arguments
 379                         //
 380
 381                         ArrayList field_infos = null;
 382                         ArrayList prop_infos  = null;
 383                         ArrayList field_values = null;
 384                         ArrayList prop_values = null;
 385
 386                         if (named_args.Count > 0) {
 387                                 field_infos = new ArrayList ();
 388                                 prop_infos  = new ArrayList ();
 389                                 field_values = new ArrayList ();
 390                                 prop_values = new ArrayList ();
 391                         }
 392
 393                         Hashtable seen_names = new Hashtable();
 394
 395                         for (i = 0; i < named_args.Count; i++) {
 396                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 397                                 string member_name = (string) de.Key;
 398                                 Argument a  = (Argument) de.Value;
 399                                 Expression e;
 400
 401                                 if (seen_names.Contains(member_name)) {
 402                                         Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
 403                                         return null;
 404                                 }
 405                                 seen_names.Add(member_name, 1);
 406
 407                                 if (!a.Resolve (ec, Location))
 408                                         return null;
 409
 410                                 Expression member = Expression.MemberLookup (
 411                                         ec, Type, member_name,
 412                                         MemberTypes.Field | MemberTypes.Property,
 413                                         BindingFlags.Public | BindingFlags.Instance,
 414                                         Location);
 415
 416                                 if (member == null) {
 417                                         member = Expression.MemberLookup (ec, Type, member_name,
 418                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 419                                                 Location);
 420
 421                                         if (member != null) {
 422                                                 Report.Error (122, Location, "'{0}' is inaccessible due to its protection level", GetFullMemberName (member_name));
 423                                                 return null;
 424                                         }
 425                                 }
 426
 427                                 if (member == null){
 428                                         Report.Error (117, Location, "Attribute `{0}' does not contain a definition for `{1}'",
 429                                                       Type, member_name);
 430                                         return null;
 431                                 }
 432
 433                                 if (!(member is PropertyExpr || member is FieldExpr)) {
 434                                         Error_InvalidNamedArgument (member_name);
 435                                         return null;
 436                                 }
 437
 438                                 e = a.Expr;
 439                                 if (member is PropertyExpr) {
 440                                         PropertyExpr pe = (PropertyExpr) member;
 441                                         PropertyInfo pi = pe.PropertyInfo;
 442
 443                                         if (!pi.CanWrite || !pi.CanRead) {
 444                                                 Report.SymbolRelatedToPreviousError (pi);
 445                                                 Error_InvalidNamedArgument (member_name);
 446                                                 return null;
 447                                         }
 448
 449                                         object value;
 450                                         if (!GetAttributeArgumentExpression (e, Location, pi.PropertyType, out value))
 451                                                 return null;
 452
 453                                         if (usage_attribute != null) {
 454                                                 if (member_name == "AllowMultiple")
 455                                                         usage_attribute.AllowMultiple = (bool) value;
 456                                                 if (member_name == "Inherited")
 457                                                         usage_attribute.Inherited = (bool) value;
 458                                         }
 459
 460                                         prop_values.Add (value);
 461                                         prop_infos.Add (pi);
 462
 463                                 } else if (member is FieldExpr) {
 464                                         FieldExpr fe = (FieldExpr) member;
 465                                         FieldInfo fi = fe.FieldInfo;
 466
 467                                         if (fi.IsInitOnly) {
 468                                                 Error_InvalidNamedArgument (member_name);
 469                                                 return null;
 470                                         }
 471
 472                                         object value;
 473                                         if (!GetAttributeArgumentExpression (e, Location, fi.FieldType, out value))
 474                                                 return null;
 475
 476                                         field_values.Add (value);
 477                                         field_infos.Add (fi);
 478                                 }
 479                         }
 480
 481                         Expression mg = Expression.MemberLookup (
 482                                 ec, Type, ".ctor", MemberTypes.Constructor,
 483                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 484                                 Location);
 485
 486                         if (mg == null) {
 487                                 Error_AttributeConstructorMismatch ();
 488                                 return null;
 489                         }
 490
 491                         MethodBase constructor = Invocation.OverloadResolve (
 492                                 ec, (MethodGroupExpr) mg, pos_args, false, Location);
 493
 494                         if (constructor == null) {
 495                                 return null;
 496                         }
 497
 498                         //
 499                         // Now we perform some checks on the positional args as they
 500                         // cannot be null for a constructor which expects a parameter
 501                         // of type object
 502                         //
 503
 504                         ParameterData pd = Invocation.GetParameterData (constructor);
 505
 506                         int last_real_param = pd.Count;
 507                         if (pd.HasParams) {
 508                                 // When the params is not filled we need to put one
 509                                 if (last_real_param > pos_arg_count) {
 510                                         object [] new_pos_values = new object [pos_arg_count + 1];
 511                                         pos_values.CopyTo (new_pos_values, 0);
 512                                         new_pos_values [pos_arg_count] = new object [] {} ;
 513                                         pos_values = new_pos_values;
 514                                 }
 515                                 last_real_param--;
 516                         }
 517
 518                         for (int j = 0; j < pos_arg_count; ++j) {
 519                                 Argument a = (Argument) pos_args [j];
 520
 521                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {
 522                                         Error_AttributeArgumentNotValid (Location);
 523                                         return null;
 524                                 }
 525
 526                                 if (j < last_real_param)
 527                                         continue;
 528
 529                                 if (j == last_real_param) {
 530                                         object [] array = new object [pos_arg_count - last_real_param];
 531                                         array [0] = pos_values [j];
 532                                         pos_values [j] = array;
 533                                         continue;
 534                                 }
 535
 536                                 object [] params_array = (object []) pos_values [last_real_param];
 537                                 params_array [j - last_real_param] = pos_values [j];
 538                         }
 539
 540                         // Adjust the size of the pos_values if it had params
 541                         if (last_real_param != pos_arg_count) {
 542                                 object [] new_pos_values = new object [last_real_param + 1];
 543                                 Array.Copy (pos_values, new_pos_values, last_real_param + 1);
 544                                 pos_values = new_pos_values;
 545                         }
 546
 547                         try {
 548                                 if (named_args.Count > 0) {
 549                                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 550                                         field_info_arr = new FieldInfo [field_infos.Count];
 551                                         field_values_arr = new object [field_values.Count];
 552                                         prop_values_arr = new object [prop_values.Count];
 553
 554                                         field_infos.CopyTo  (field_info_arr, 0);
 555                                         field_values.CopyTo (field_values_arr, 0);
 556
 557                                         prop_values.CopyTo  (prop_values_arr, 0);
 558                                         prop_infos.CopyTo   (prop_info_arr, 0);
 559
 560                                         cb = new CustomAttributeBuilder (
 561                                                 (ConstructorInfo) constructor, pos_values,
 562                                                 prop_info_arr, prop_values_arr,
 563                                                 field_info_arr, field_values_arr);
 564                                 }
 565                                 else
 566                                         cb = new CustomAttributeBuilder (
 567                                                 (ConstructorInfo) constructor, pos_values);
 568                         } catch (Exception e) {
 569                                 //
 570                                 // Sample:
 571                                 // using System.ComponentModel;
 572                                 // [DefaultValue (CollectionChangeAction.Add)]
 573                                 // class X { static void Main () {} }
 574                                 //
 575                                 Error_AttributeArgumentNotValid (Location);
 576                                 return null;
 577                         }
 578
 579                         resolve_error = false;
 580                         return cb;
 581                 }
 582
 583                 /// <summary>
 584                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 585                 /// </summary>
 586                 public string GetValidTargets ()
 587                 {
 588                         StringBuilder sb = new StringBuilder ();
 589                         AttributeTargets targets = GetAttributeUsage ().ValidOn;
 590
 591                         if ((targets & AttributeTargets.Assembly) != 0)
 592                                 sb.Append ("'assembly' ");
 593
 594                         if ((targets & AttributeTargets.Class) != 0)
 595                                 sb.Append ("'class' ");
 596
 597                         if ((targets & AttributeTargets.Constructor) != 0)
 598                                 sb.Append ("'constructor' ");
 599
 600                         if ((targets & AttributeTargets.Delegate) != 0)
 601                                 sb.Append ("'delegate' ");
 602
 603                         if ((targets & AttributeTargets.Enum) != 0)
 604                                 sb.Append ("'enum' ");
 605
 606                         if ((targets & AttributeTargets.Event) != 0)
 607                                 sb.Append ("'event' ");
 608
 609                         if ((targets & AttributeTargets.Field) != 0)
 610                                 sb.Append ("'field' ");
 611
 612                         if ((targets & AttributeTargets.Interface) != 0)
 613                                 sb.Append ("'interface' ");
 614
 615                         if ((targets & AttributeTargets.Method) != 0)
 616                                 sb.Append ("'method' ");
 617
 618                         if ((targets & AttributeTargets.Module) != 0)
 619                                 sb.Append ("'module' ");
 620
 621                         if ((targets & AttributeTargets.Parameter) != 0)
 622                                 sb.Append ("'parameter' ");
 623
 624                         if ((targets & AttributeTargets.Property) != 0)
 625                                 sb.Append ("'property' ");
 626
 627                         if ((targets & AttributeTargets.ReturnValue) != 0)
 628                                 sb.Append ("'return' ");
 629
 630                         if ((targets & AttributeTargets.Struct) != 0)
 631                                 sb.Append ("'struct' ");
 632
 633                         return sb.ToString ();
 634
 635                 }
 636
 637                 /// <summary>
 638                 /// Returns AttributeUsage attribute for this type
 639                 /// </summary>
 640                 public AttributeUsageAttribute GetAttributeUsage ()
 641                 {
 642                         AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
 643                         if (ua != null)
 644                                 return ua;
 645
 646                         Class attr_class = TypeManager.LookupClass (Type);
 647
 648                         if (attr_class == null) {
 649                                 object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 650                                 ua = (AttributeUsageAttribute)usage_attr [0];
 651                                 usage_attr_cache.Add (Type, ua);
 652                                 return ua;
 653                         }
 654
 655                         return attr_class.AttributeUsage;
 656                 }
 657
 658                 /// <summary>
 659                 /// Returns custom name of indexer
 660                 /// </summary>
 661                 public string GetIndexerAttributeValue (EmitContext ec)
 662                 {
 663                         if (pos_values == null) {
 664                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 665                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 666                                 Resolve (ec);
 667                         }
 668
 669                         return pos_values [0] as string;
 670                 }
 671
 672                 /// <summary>
 673                 /// Returns condition of ConditionalAttribute
 674                 /// </summary>
 675                 public string GetConditionalAttributeValue (DeclSpace ds)
 676                 {
 677                         if (pos_values == null) {
 678                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 679
 680                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 681                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 682                                 Resolve (ec);
 683                         }
 684
 685                         // Some error occurred
 686                         if (pos_values [0] == null)
 687                                 return null;
 688
 689                         return (string)pos_values [0];
 690                 }
 691
 692                 /// <summary>
 693                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 694                 /// </summary>
 695                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 696                 {
 697                         if (pos_values == null) {
 698                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 699
 700                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 701                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 702                                 Resolve (ec);
 703                         }
 704
 705                         // Some error occurred
 706                         if (pos_values == null)
 707                                 return null;
 708
 709                         if (pos_values.Length == 0)
 710                                 return new ObsoleteAttribute ();
 711
 712                         if (pos_values.Length == 1)
 713                                 return new ObsoleteAttribute ((string)pos_values [0]);
 714
 715                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 716                 }
 717
 718                 /// <summary>
 719                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 720                 /// before ApplyAttribute. We need to resolve the arguments.
 721                 /// This situation occurs when class deps is differs from Emit order.
 722                 /// </summary>
 723                 public bool GetClsCompliantAttributeValue (DeclSpace ds)
 724                 {
 725                         if (pos_values == null) {
 726                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 727
 728                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 729                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 730                                 Resolve (ec);
 731                         }
 732
 733                         // Some error occurred
 734                         if (pos_values [0] == null)
 735                                 return false;
 736
 737                         return (bool)pos_values [0];
 738                 }
 739
 740                 /// <summary>
 741                 /// Tests permitted SecurityAction for assembly or other types
 742                 /// </summary>
 743                 public bool CheckSecurityActionValidity (bool for_assembly)
 744                 {
 745                         SecurityAction action  = GetSecurityActionValue ();
 746
 747                         if ((action == SecurityAction.RequestMinimum || action == SecurityAction.RequestOptional || action == SecurityAction.RequestRefuse) && for_assembly)
 748                                 return true;
 749
 750                         if (!for_assembly) {
 751                                 if (action < SecurityAction.Demand || action > SecurityAction.InheritanceDemand) {
 752                                         Error_AttributeEmitError ("SecurityAction is out of range");
 753                                         return false;
 754                                 }
 755
 756                                 if ((action != SecurityAction.RequestMinimum && action != SecurityAction.RequestOptional && action != SecurityAction.RequestRefuse) && !for_assembly)
 757                                         return true;
 758                         }
 759
 760                         Error_AttributeEmitError (String.Concat ("SecurityAction '", action, "' is not valid for this declaration"));
 761                         return false;
 762                 }
 763
 764                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 765                 {
 766                         return (SecurityAction)pos_values [0];
 767                 }
 768
 769                 /// <summary>
 770                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 771                 /// </summary>
 772                 /// <returns></returns>
 773                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 774                 {
 775                         if (TypeManager.LookupDeclSpace (Type) != null && RootContext.StdLib) {
 776                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 777                                 return;
 778                         }
 779
 780                         SecurityAttribute sa;
 781                         // For all assemblies except corlib we can avoid all hacks
 782                         if (RootContext.StdLib) {
 783                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 784
 785                                 if (prop_info_arr != null) {
 786                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 787                                                 PropertyInfo pi = prop_info_arr [i];
 788                                                 pi.SetValue (sa, prop_values_arr [i], null);
 789                                         }
 790                                 }
 791                         } else {
 792                                 Type temp_type = Type.GetType (Type.FullName);
 793                                 // HACK: All mscorlib attributes have same ctor syntax
 794                                 sa = (SecurityAttribute) Activator.CreateInstance (temp_type, new object[] { GetSecurityActionValue () } );
 795
 796                                 // All types are from newly created corlib but for invocation with old we need to convert them
 797                                 if (prop_info_arr != null) {
 798                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 799                                                 PropertyInfo emited_pi = prop_info_arr [i];
 800                                                 PropertyInfo pi = temp_type.GetProperty (emited_pi.Name, emited_pi.PropertyType);
 801
 802                                                 object old_instance = pi.PropertyType.IsEnum ?
 803                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
 804                                                         prop_values_arr [i];
 805
 806                                                 pi.SetValue (sa, old_instance, null);
 807                                         }
 808                                 }
 809                         }
 810
 811                         IPermission perm = sa.CreatePermission ();
 812                         SecurityAction action;
 813
 814                         // IS is correct because for corlib we are using an instance from old corlib
 815                         if (perm is System.Security.CodeAccessPermission) {
 816                                 action = GetSecurityActionValue ();
 817                         } else {
 818                                 switch (GetSecurityActionValue ()) {
 819                                         case SecurityAction.Demand:
 820                                                 action = (SecurityAction)13;
 821                                                 break;
 822                                         case SecurityAction.LinkDemand:
 823                                                 action = (SecurityAction)14;
 824                                                 break;
 825                                         case SecurityAction.InheritanceDemand:
 826                                                 action = (SecurityAction)15;
 827                                                 break;
 828                                         default:
 829                                                 Error_AttributeEmitError ("Invalid SecurityAction for non-Code Access Security permission");
 830                                                 return;
 831                                 }
 832                         }
 833
 834                         PermissionSet ps = (PermissionSet)permissions [action];
 835                         if (ps == null) {
 836                                 ps = new PermissionSet (PermissionState.None);
 837                                 permissions.Add (action, ps);
 838                         }
 839                         ps.AddPermission (sa.CreatePermission ());
 840                 }
 841
 842                 object GetValue (object value)
 843                 {
 844                         if (value is EnumConstant)
 845                                 return ((EnumConstant) value).GetValue ();
 846                         else
 847                                 return value;
 848                 }
 849
 850                 public object GetPositionalValue (int i)
 851                 {
 852                         return (pos_values == null) ? null : pos_values[i];
 853                 }
 854
 855                 object GetFieldValue (string name)
 856                 {
 857                         int i;
 858                         if (field_info_arr == null)
 859                                 return null;
 860                         i = 0;
 861                         foreach (FieldInfo fi in field_info_arr) {
 862                                 if (fi.Name == name)
 863                                         return GetValue (field_values_arr [i]);
 864                                 i++;
 865                         }
 866                         return null;
 867                 }
 868
 869                 public UnmanagedMarshal GetMarshal (Attributable attr)
 870                 {
 871                         object value = GetFieldValue ("SizeParamIndex");
 872                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
 873                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
 874                                 return null;
 875                         }
 876
 877                         object o = GetFieldValue ("ArraySubType");
 878                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;
 879
 880                         switch (UnmanagedType) {
 881                         case UnmanagedType.CustomMarshaler:
 882                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
 883                                                                        BindingFlags.Static | BindingFlags.Public);
 884                                 if (define_custom == null) {
 885                                         Report.RuntimeMissingSupport (Location, "set marshal info");
 886                                         return null;
 887                                 }
 888
 889                                 object [] args = new object [4];
 890                                 args [0] = GetFieldValue ("MarshalTypeRef");
 891                                 args [1] = GetFieldValue ("MarshalCookie");
 892                                 args [2] = GetFieldValue ("MarshalType");
 893                                 args [3] = Guid.Empty;
 894                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
 895
 896                         case UnmanagedType.LPArray:
 897                                 return UnmanagedMarshal.DefineLPArray (array_sub_type);
 898
 899                         case UnmanagedType.SafeArray:
 900                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
 901
 902                         case UnmanagedType.ByValArray:
 903                                 FieldMember fm = attr as FieldMember;
 904                                 if (fm == null) {
 905                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
 906                                         return null;
 907                                 }
 908                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
 909
 910                         case UnmanagedType.ByValTStr:
 911                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
 912
 913                         default:
 914                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
 915                         }
 916                 }
 917
 918                 public bool IsInternalCall
 919                 {
 920                         get { return ImplOptions == MethodImplOptions.InternalCall; }
 921                 }
 922
 923                 /// <summary>
 924                 /// Emit attribute for Attributable symbol
 925                 /// </summary>
 926                 public void Emit (EmitContext ec, Attributable ias, ListDictionary emitted_attr)
 927                 {
 928                         CustomAttributeBuilder cb = Resolve (ec);
 929                         if (cb == null)
 930                                 return;
 931
 932                         AttributeUsageAttribute usage_attr = GetAttributeUsage ();
 933                         if ((usage_attr.ValidOn & Target) == 0) {
 934                                 Report.Error (592, Location, "Attribute '{0}' is not valid on this declaration type. It is valid on {1} declarations only.", Name, GetValidTargets ());
 935                                 return;
 936                         }
 937
 938                         ias.ApplyAttributeBuilder (this, cb);
 939
 940                         if (!usage_attr.AllowMultiple) {
 941                                 ArrayList emitted_targets = (ArrayList)emitted_attr [Type];
 942                                 if (emitted_targets == null) {
 943                                         emitted_targets = new ArrayList ();
 944                                         emitted_attr.Add (Type, emitted_targets);
 945                                 } else if (emitted_targets.Contains (Target)) {
 946                                         Report.Error (579, Location, "Duplicate '" + Name + "' attribute");
 947                                         return;
 948                                 }
 949                                 emitted_targets.Add (Target);
 950                         }
 951
 952                         if (!RootContext.VerifyClsCompliance)
 953                                 return;
 954
 955                         // Here we are testing attribute arguments for array usage (error 3016)
 956                         if (ias.IsClsCompliaceRequired (ec.DeclSpace)) {
 957                                 if (Arguments == null)
 958                                         return;
 959
 960                                 ArrayList pos_args = (ArrayList) Arguments [0];
 961                                 if (pos_args != null) {
 962                                         foreach (Argument arg in pos_args) {
 963                                                 // Type is undefined (was error 246)
 964                                                 if (arg.Type == null)
 965                                                         return;
 966
 967                                                 if (arg.Type.IsArray) {
 968                                                         Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 969                                                         return;
 970                                                 }
 971                                         }
 972                                 }
 973
 974                                 if (Arguments.Count < 2)
 975                                         return;
 976
 977                                 ArrayList named_args = (ArrayList) Arguments [1];
 978                                 foreach (DictionaryEntry de in named_args) {
 979                                         Argument arg  = (Argument) de.Value;
 980
 981                                         // Type is undefined (was error 246)
 982                                         if (arg.Type == null)
 983                                                 return;
 984
 985                                         if (arg.Type.IsArray) {
 986                                                 Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 987                                                 return;
 988                                         }
 989                                 }
 990                         }
 991                 }
 992
 993                 public object GetValue (EmitContext ec, Constant c, Type target)
 994                 {
 995                         if (Convert.ImplicitConversionExists (ec, c, target))
 996                                 return c.GetValue ();
 997
 998                         Convert.Error_CannotImplicitConversion (Location, c.Type, target);
 999                         return null;
1000                 }
1001
1002                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,
1003                                                           MethodAttributes flags, Type ret_type, Type [] param_types)
1004                 {
1005                         //
1006                         // We extract from the attribute the information we need
1007                         //
1008
1009                         if (Arguments == null) {
1010                                 Console.WriteLine ("Internal error : this is not supposed to happen !");
1011                                 return null;
1012                         }
1013
1014                         ResolveType (ec);
1015                         if (Type == null)
1016                                 return null;
1017
1018                         ArrayList named_args = new ArrayList ();
1019
1020                         ArrayList pos_args = (ArrayList) Arguments [0];
1021                         if (Arguments.Count > 1)
1022                                 named_args = (ArrayList) Arguments [1];
1023
1024
1025                         string dll_name = null;
1026
1027                         Argument tmp = (Argument) pos_args [0];
1028
1029                         if (!tmp.Resolve (ec, Location))
1030                                 return null;
1031
1032                         if (tmp.Expr is Constant)
1033                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();
1034                         else {
1035                                 Error_AttributeArgumentNotValid (Location);
1036                                 return null;
1037                         }
1038
1039                         // Now we process the named arguments
1040                         CallingConvention cc = CallingConvention.Winapi;
1041                         CharSet charset = CharSet.Ansi;
1042                         bool preserve_sig = true;
1043 #if FIXME
1044                         bool exact_spelling = false;
1045 #endif
1046                         bool set_last_err = false;
1047                         string entry_point = null;
1048
1049                         for (int i = 0; i < named_args.Count; i++) {
1050
1051                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
1052
1053                                 string member_name = (string) de.Key;
1054                                 Argument a  = (Argument) de.Value;
1055
1056                                 if (!a.Resolve (ec, Location))
1057                                         return null;
1058
1059                                 Expression member = Expression.MemberLookup (
1060                                         ec, Type, member_name,
1061                                         MemberTypes.Field | MemberTypes.Property,
1062                                         BindingFlags.Public | BindingFlags.Instance,
1063                                         Location);
1064
1065                                 if (member == null || !(member is FieldExpr)) {
1066                                         Error_InvalidNamedArgument (member_name);
1067                                         return null;
1068                                 }
1069
1070                                 if (member is FieldExpr) {
1071                                         FieldExpr fe = (FieldExpr) member;
1072                                         FieldInfo fi = fe.FieldInfo;
1073
1074                                         if (fi.IsInitOnly) {
1075                                                 Error_InvalidNamedArgument (member_name);
1076                                                 return null;
1077                                         }
1078
1079                                         if (a.Expr is Constant) {
1080                                                 Constant c = (Constant) a.Expr;
1081
1082                                                 try {
1083                                                         if (member_name == "CallingConvention"){
1084                                                                 object val = GetValue (ec, c, typeof (CallingConvention));
1085                                                                 if (val == null)
1086                                                                         return null;
1087                                                                 cc = (CallingConvention) val;
1088                                                         } else if (member_name == "CharSet"){
1089                                                                 charset = (CharSet) c.GetValue ();
1090                                                         } else if (member_name == "EntryPoint")
1091                                                                 entry_point = (string) c.GetValue ();
1092                                                         else if (member_name == "SetLastError")
1093                                                                 set_last_err = (bool) c.GetValue ();
1094 #if FIXME
1095                                                         else if (member_name == "ExactSpelling")
1096                                                                 exact_spelling = (bool) c.GetValue ();
1097 #endif
1098                                                         else if (member_name == "PreserveSig")
1099                                                                 preserve_sig = (bool) c.GetValue ();
1100                                                 } catch (InvalidCastException){
1101                                                         Error_InvalidNamedArgument (member_name);
1102                                                         Error_AttributeArgumentNotValid (Location);
1103                                                 }
1104                                         } else {
1105                                                 Error_AttributeArgumentNotValid (Location);
1106                                                 return null;
1107                                         }
1108
1109                                 }
1110                         }
1111
1112                         if (entry_point == null)
1113                                 entry_point = name;
1114                         if (set_last_err)
1115                                 charset = (CharSet)((int)charset | 0x40);
1116
1117                         MethodBuilder mb = builder.DefinePInvokeMethod (
1118                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,
1119                                 CallingConventions.Standard,
1120                                 ret_type,
1121                                 param_types,
1122                                 cc,
1123                                 charset);
1124
1125                         if (preserve_sig)
1126                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);
1127
1128                         return mb;
1129                 }
1130
1131                 private Expression GetValue ()
1132                 {
1133                         if ((Arguments == null) || (Arguments.Count < 1))
1134                                 return null;
1135                         ArrayList al = (ArrayList) Arguments [0];
1136                         if ((al == null) || (al.Count < 1))
1137                                 return null;
1138                         Argument arg = (Argument) al [0];
1139                         if ((arg == null) || (arg.Expr == null))
1140                                 return null;
1141                         return arg.Expr;
1142                 }
1143
1144                 public string GetString ()
1145                 {
1146                         Expression e = GetValue ();
1147                         if (e is StringLiteral)
1148                                 return (e as StringLiteral).Value;
1149                         return null;
1150                 }
1151
1152                 public bool GetBoolean ()
1153                 {
1154                         Expression e = GetValue ();
1155                         if (e is BoolLiteral)
1156                                 return (e as BoolLiteral).Value;
1157                         return false;
1158                 }
1159         }
1160
1161
1162         /// <summary>
1163         /// For global attributes (assembly, module) we need special handling.
1164         /// Attributes can be located in the several files
1165         /// </summary>
1166         public class GlobalAttribute: Attribute
1167         {
1168                 public readonly NamespaceEntry ns;
1169
1170                 public GlobalAttribute (TypeContainer container, string target, string name, ArrayList args, Location loc):
1171                         base (target, name, args, loc)
1172                 {
1173                         ns = container.NamespaceEntry;
1174                 }
1175
1176                 protected override Type CheckAttributeType (EmitContext ec)
1177                 {
1178                         // RootContext.Tree.Types has a single NamespaceEntry which gets overwritten
1179                         // each time a new file is parsed.  However, we need to use the NamespaceEntry
1180                         // in effect where the attribute was used.  Since code elsewhere cannot assume
1181                         // that the NamespaceEntry is right, just overwrite it.
1182                         //
1183                         // FIXME: Check every place the NamespaceEntry of RootContext.Tree.Types is used
1184                         //        to ensure the right one is used.
1185                         if (ec.DeclSpace == RootContext.Tree.Types)
1186                                 ec.DeclSpace.NamespaceEntry = ns;
1187
1188                         return base.CheckAttributeType (ec);
1189                 }
1190         }
1191
1192         public class Attributes {
1193                 public ArrayList Attrs;
1194
1195                 public Attributes (Attribute a)
1196                 {
1197                         Attrs = new ArrayList ();
1198                         Attrs.Add (a);
1199                 }
1200
1201                 public Attributes (ArrayList attrs)
1202                 {
1203                         Attrs = attrs;
1204                 }
1205
1206                 public void AddAttributes (ArrayList attrs)
1207                 {
1208                         Attrs.AddRange (attrs);
1209                 }
1210
1211                 /// <summary>
1212                 /// Checks whether attribute target is valid for the current element
1213                 /// </summary>
1214                 public bool CheckTargets (Attributable member)
1215                 {
1216                         string[] valid_targets = member.ValidAttributeTargets;
1217                         foreach (Attribute a in Attrs) {
1218                                 if (a.ExplicitTarget == null || a.ExplicitTarget == valid_targets [0]) {
1219                                         a.Target = member.AttributeTargets;
1220                                         continue;
1221                                 }
1222
1223                                 // TODO: we can skip the first item
1224                                 if (((IList) valid_targets).Contains (a.ExplicitTarget)) {
1225                                         switch (a.ExplicitTarget) {
1226                                                 case "return": a.Target = AttributeTargets.ReturnValue; continue;
1227                                                 case "param": a.Target = AttributeTargets.Parameter; continue;
1228                                                 case "field": a.Target = AttributeTargets.Field; continue;
1229                                                 case "method": a.Target = AttributeTargets.Method; continue;
1230                                                 case "property": a.Target = AttributeTargets.Property; continue;
1231                                         }
1232                                         throw new InternalErrorException ("Unknown explicit target: " + a.ExplicitTarget);
1233                                 }
1234
1235                                 StringBuilder sb = new StringBuilder ();
1236                                 foreach (string s in valid_targets) {
1237                                         sb.Append (s);
1238                                         sb.Append (", ");
1239                                 }
1240                                 sb.Remove (sb.Length - 2, 2);
1241                                 Report.Error (657, a.Location, "'{0}' is not a valid attribute location for this declaration. Valid attribute locations for this declaration are '{1}'", a.ExplicitTarget, sb.ToString ());
1242                                 return false;
1243                         }
1244                         return true;
1245                 }
1246
1247                 public Attribute Search (Type t, EmitContext ec)
1248                 {
1249                         foreach (Attribute a in Attrs) {
1250                                 if (a.ResolveType (ec) == t)
1251                                         return a;
1252                         }
1253                         return null;
1254                 }
1255
1256                 /// <summary>
1257                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1258                 /// </summary>
1259                 public Attribute[] SearchMulti (Type t, EmitContext ec)
1260                 {
1261                         ArrayList ar = null;
1262
1263                         foreach (Attribute a in Attrs) {
1264                                 if (a.ResolveType (ec) == t) {
1265                                         if (ar == null)
1266                                                 ar = new ArrayList ();
1267                                         ar.Add (a);
1268                                 }
1269                         }
1270
1271                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1272                 }
1273
1274                 public void Emit (EmitContext ec, Attributable ias)
1275                 {
1276                         if (!CheckTargets (ias))
1277                                 return;
1278
1279                         ListDictionary ld = new ListDictionary ();
1280
1281                         foreach (Attribute a in Attrs)
1282                                 a.Emit (ec, ias, ld);
1283                 }
1284
1285                 public bool Contains (Type t, EmitContext ec)
1286                 {
1287                         return Search (t, ec) != null;
1288                 }
1289         }
1290
1291         /// <summary>
1292         /// Helper class for attribute verification routine.
1293         /// </summary>
1294         sealed class AttributeTester
1295         {
1296                 static PtrHashtable analyzed_types = new PtrHashtable ();
1297                 static PtrHashtable analyzed_types_obsolete = new PtrHashtable ();
1298                 static PtrHashtable analyzed_member_obsolete = new PtrHashtable ();
1299                 static PtrHashtable analyzed_method_excluded = new PtrHashtable ();
1300
1301                 private AttributeTester ()
1302                 {
1303                 }
1304
1305                 /// <summary>
1306                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1307                 /// It tests differing only in ref or out, or in array rank.
1308                 /// </summary>
1309                 public static bool AreOverloadedMethodParamsClsCompliant (Type[] types_a, Type[] types_b)
1310                 {
1311                         if (types_a == null || types_b == null)
1312                                 return true;
1313
1314                         if (types_a.Length != types_b.Length)
1315                                 return true;
1316
1317                         for (int i = 0; i < types_b.Length; ++i) {
1318                                 Type aType = types_a [i];
1319                                 Type bType = types_b [i];
1320
1321                                 if (aType.IsArray && bType.IsArray && aType.GetArrayRank () != bType.GetArrayRank () && aType.GetElementType () == bType.GetElementType ()) {
1322                                         return false;
1323                                 }
1324
1325                                 Type aBaseType = aType;
1326                                 bool is_either_ref_or_out = false;
1327
1328                                 if (aType.IsByRef || aType.IsPointer) {
1329                                         aBaseType = aType.GetElementType ();
1330                                         is_either_ref_or_out = true;
1331                                 }
1332
1333                                 Type bBaseType = bType;
1334                                 if (bType.IsByRef || bType.IsPointer)
1335                                 {
1336                                         bBaseType = bType.GetElementType ();
1337                                         is_either_ref_or_out = !is_either_ref_or_out;
1338                                 }
1339
1340                                 if (aBaseType != bBaseType)
1341                                         continue;
1342
1343                                 if (is_either_ref_or_out)
1344                                         return false;
1345                         }
1346                         return true;
1347                 }
1348
1349                 /// <summary>
1350                 /// Goes through all parameters and test if they are CLS-Compliant.
1351                 /// </summary>
1352                 public static bool AreParametersCompliant (Parameter[] fixedParameters, Location loc)
1353                 {
1354                         if (fixedParameters == null)
1355                                 return true;
1356
1357                         foreach (Parameter arg in fixedParameters) {
1358                                 if (!AttributeTester.IsClsCompliant (arg.ParameterType)) {
1359                                         Report.Error (3001, loc, "Argument type '{0}' is not CLS-compliant", arg.GetSignatureForError ());
1360                                         return false;
1361                                 }
1362                         }
1363                         return true;
1364                 }
1365
1366
1367                 /// <summary>
1368                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1369                 /// </summary>
1370                 public static bool IsClsCompliant (Type type)
1371                 {
1372                         if (type == null)
1373                                 return true;
1374
1375                         object type_compliance = analyzed_types[type];
1376                         if (type_compliance != null)
1377                                 return type_compliance == TRUE;
1378
1379                         if (type.IsPointer) {
1380                                 analyzed_types.Add (type, null);
1381                                 return false;
1382                         }
1383
1384                         bool result;
1385                         if (type.IsArray || type.IsByRef)       {
1386                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1387                         } else {
1388                                 result = AnalyzeTypeCompliance (type);
1389                         }
1390                         analyzed_types.Add (type, result ? TRUE : FALSE);
1391                         return result;
1392                 }
1393
1394                 static object TRUE = new object ();
1395                 static object FALSE = new object ();
1396
1397                 public static void VerifyModulesClsCompliance ()
1398                 {
1399                         Module[] modules = TypeManager.Modules;
1400                         if (modules == null)
1401                                 return;
1402
1403                         // The first module is generated assembly
1404                         for (int i = 1; i < modules.Length; ++i) {
1405                                 Module module = modules [i];
1406                                 if (!IsClsCompliant (module)) {
1407                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute to match the assembly", module.Name);
1408                                         return;
1409                                 }
1410                         }
1411                 }
1412
1413                 /// <summary>
1414                 /// Tests container name for CLS-Compliant name (differing only in case)
1415                 /// </summary>
1416                 public static void VerifyTopLevelNameClsCompliance ()
1417                 {
1418                         Hashtable locase_table = new Hashtable ();
1419
1420                         // Convert imported type names to lower case and ignore not cls compliant
1421                         foreach (DictionaryEntry de in TypeManager.all_imported_types) {
1422                                 Type t = (Type)de.Value;
1423                                 if (!AttributeTester.IsClsCompliant (t))
1424                                         continue;
1425
1426                                 locase_table.Add (((string)de.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture), t);
1427                         }
1428
1429                         foreach (DictionaryEntry de in RootContext.Tree.Decls) {
1430                                 DeclSpace decl = (DeclSpace)de.Value;
1431                                 if (!decl.IsClsCompliaceRequired (decl))
1432                                         continue;
1433
1434                                 string lcase = decl.Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1435                                 if (!locase_table.Contains (lcase)) {
1436                                         locase_table.Add (lcase, decl);
1437                                         continue;
1438                                 }
1439
1440                                 object conflict = locase_table [lcase];
1441                                 if (conflict is Type)
1442                                         Report.SymbolRelatedToPreviousError ((Type)conflict);
1443                                 else
1444                                         Report.SymbolRelatedToPreviousError ((MemberCore)conflict);
1445
1446                                 Report.Error (3005, decl.Location, "Identifier '{0}' differing only in case is not CLS-compliant", decl.GetSignatureForError ());
1447                         }
1448                 }
1449
1450                 static bool IsClsCompliant (ICustomAttributeProvider attribute_provider)
1451                 {
1452                         object[] CompliantAttribute = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1453                         if (CompliantAttribute.Length == 0)
1454                                 return false;
1455
1456                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1457                 }
1458
1459                 static bool AnalyzeTypeCompliance (Type type)
1460                 {
1461                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1462                         if (ds != null) {
1463                                 return ds.IsClsCompliaceRequired (ds.Parent);
1464                         }
1465
1466                         object[] CompliantAttribute = type.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1467                         if (CompliantAttribute.Length == 0)
1468                                 return IsClsCompliant (type.Assembly);
1469
1470                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1471                 }
1472
1473                 /// <summary>
1474                 /// Returns instance of ObsoleteAttribute when type is obsolete
1475                 /// </summary>
1476                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1477                 {
1478                         object type_obsolete = analyzed_types_obsolete [type];
1479                         if (type_obsolete == FALSE)
1480                                 return null;
1481
1482                         if (type_obsolete != null)
1483                                 return (ObsoleteAttribute)type_obsolete;
1484
1485                         ObsoleteAttribute result = null;
1486                         if (type.IsByRef || type.IsArray || type.IsPointer) {
1487                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1488                         } else {
1489                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1490
1491                                 // Type is external, we can get attribute directly
1492                                 if (type_ds == null) {
1493                                         object[] attribute = type.GetCustomAttributes (TypeManager.obsolete_attribute_type, false);
1494                                         if (attribute.Length == 1)
1495                                                 result = (ObsoleteAttribute)attribute [0];
1496                                 } else {
1497                                         result = type_ds.GetObsoleteAttribute (type_ds);
1498                                 }
1499                         }
1500
1501                         analyzed_types_obsolete.Add (type, result == null ? FALSE : result);
1502                         return result;
1503                 }
1504
1505                 /// <summary>
1506                 /// Returns instance of ObsoleteAttribute when method is obsolete
1507                 /// </summary>
1508                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1509                 {
1510                         IMethodData mc = TypeManager.GetMethod (mb);
1511                         if (mc != null)
1512                                 return mc.GetObsoleteAttribute ();
1513
1514                         // compiler generated methods are not registered by AddMethod
1515                         if (mb.DeclaringType is TypeBuilder)
1516                                 return null;
1517
1518                         return GetMemberObsoleteAttribute (mb);
1519                 }
1520
1521                 /// <summary>
1522                 /// Returns instance of ObsoleteAttribute when member is obsolete
1523                 /// </summary>
1524                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1525                 {
1526                         object type_obsolete = analyzed_member_obsolete [mi];
1527                         if (type_obsolete == FALSE)
1528                                 return null;
1529
1530                         if (type_obsolete != null)
1531                                 return (ObsoleteAttribute)type_obsolete;
1532
1533                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false) as ObsoleteAttribute;
1534                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1535                         return oa;
1536                 }
1537
1538                 /// <summary>
1539                 /// Common method for Obsolete error/warning reporting.
1540                 /// </summary>
1541                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1542                 {
1543                         if (oa.IsError) {
1544                                 Report.Error (619, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1545                                 return;
1546                         }
1547
1548                         if (oa.Message == null) {
1549                                 Report.Warning (612, loc, "'{0}' is obsolete", member);
1550                                 return;
1551                         }
1552                         if (RootContext.WarningLevel >= 2)
1553                                 Report.Warning (618, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1554                 }
1555
1556                 public static bool IsConditionalMethodExcluded (MethodBase mb)
1557                 {
1558                         object excluded = analyzed_method_excluded [mb];
1559                         if (excluded != null)
1560                                 return excluded == TRUE ? true : false;
1561
1562                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (TypeManager.conditional_attribute_type, true) as ConditionalAttribute[];
1563                         if (attrs.Length == 0) {
1564                                 analyzed_method_excluded.Add (mb, FALSE);
1565                                 return false;
1566                         }
1567
1568                         foreach (ConditionalAttribute a in attrs) {
1569                                 if (RootContext.AllDefines.Contains (a.ConditionString)) {
1570                                         analyzed_method_excluded.Add (mb, FALSE);
1571                                         return false;
1572                                 }
1573                         }
1574                         analyzed_method_excluded.Add (mb, TRUE);
1575                         return true;
1576                 }
1577         }
1578 }