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                 // Is non-null if type is AttributeUsageAttribute
  82                 AttributeUsageAttribute usage_attribute;
  83
  84                 public AttributeUsageAttribute UsageAttribute {
  85                         get {
  86                                 return usage_attribute;
  87                         }
  88                 }
  89
  90                 MethodImplOptions ImplOptions;
  91                 UnmanagedType     UnmanagedType;
  92                 CustomAttributeBuilder cb;
  93
  94                 // non-null if named args present after Resolve () is called
  95                 PropertyInfo [] prop_info_arr;
  96                 FieldInfo [] field_info_arr;
  97                 object [] field_values_arr;
  98                 object [] prop_values_arr;
  99                 object [] pos_values;
 100
 101                 static PtrHashtable usage_attr_cache = new PtrHashtable ();
 102
 103                 public Attribute (string target, string name, ArrayList args, Location loc)
 104                 {
 105                         Name = name;
 106                         Arguments = args;
 107                         Location = loc;
 108                         ExplicitTarget = target;
 109                 }
 110
 111                 void Error_InvalidNamedArgument (string name)
 112                 {
 113                         Report.Error (617, Location, "Invalid attribute argument: '{0}'.  Argument must be fields " +
 114                                       "fields which are not readonly, static or const;  or read-write instance properties.",
 115                                       Name);
 116                 }
 117
 118                 static void Error_AttributeArgumentNotValid (Location loc)
 119                 {
 120                         Report.Error (182, loc,
 121                                       "An attribute argument must be a constant expression, typeof " +
 122                                       "expression or array creation expression");
 123                 }
 124
 125                 /// <summary>
 126                 /// This is rather hack. We report many emit attribute error with same error to be compatible with
 127                 /// csc. But because csc has to report them this way because error came from ilasm we needn't.
 128                 /// </summary>
 129                 public void Error_AttributeEmitError (string inner)
 130                 {
 131                         Report.Error (647, Location, "Error emitting '{0}' attribute because '{1}'", Name, inner);
 132                 }
 133
 134                 public void Error_InvalidSecurityParent ()
 135                 {
 136                         Error_AttributeEmitError ("it is attached to invalid parent");
 137                 }
 138
 139                 void Error_AttributeConstructorMismatch ()
 140                 {
 141                         Report.Error (-6, Location,
 142                                       "Could not find a constructor for this argument list.");
 143                 }
 144
 145                 /// <summary>
 146                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 147                 /// </summary>
 148                 protected virtual Type CheckAttributeType (EmitContext ec)
 149                 {
 150                         string NameAttribute = Name + "Attribute";
 151
 152                         Type t1 = ec.ResolvingTypeTree
 153                                 ? ec.DeclSpace.FindType (Location, Name)
 154                                 : RootContext.LookupType (ec.DeclSpace, Name, true, Location);
 155
 156                         // FIXME: Shouldn't do this for quoted attributes: [@A]
 157                         Type t2 = ec.ResolvingTypeTree
 158                                 ? ec.DeclSpace.FindType (Location, NameAttribute)
 159                                 : RootContext.LookupType (ec.DeclSpace, NameAttribute, true, Location);
 160
 161                         String err0616 = null;
 162
 163                         if (t1 != null && ! t1.IsSubclassOf (TypeManager.attribute_type)) {
 164                                 t1 = null;
 165                                 err0616 = "'" + Name + "': is not an attribute class";
 166                         }
 167                         if (t2 != null && ! t2.IsSubclassOf (TypeManager.attribute_type)) {
 168                                 t2 = null;
 169                                 err0616 = (err0616 != null)
 170                                         ? "Neither '" + Name + "' nor '" + NameAttribute +"' is an attribute class"
 171                                         : "'" + Name + "Attribute': is not an attribute class";
 172                         }
 173
 174                         if (t1 != null && t2 != null) {
 175                                 Report.Error(1614, Location, "'" + Name + "': is ambiguous; "
 176                                              + " use either '@" + Name + "' or '" + NameAttribute + "'");
 177                                 return null;
 178                         }
 179                         if (t1 != null)
 180                                 return t1;
 181                         if (t2 != null)
 182                                 return t2;
 183
 184                         if (err0616 != null) {
 185                                 Report.Error (616, Location, err0616);
 186                                 return null;
 187                         }
 188
 189                         Report.Error (246, Location,
 190                                       "Could not find attribute '" + Name
 191                                       + "' (are you missing a using directive or an assembly reference ?)");
 192
 193                         return null;
 194                 }
 195
 196                 public Type ResolveType (EmitContext ec)
 197                 {
 198                         if (Type == null)
 199                                 Type = CheckAttributeType (ec);
 200                         return Type;
 201                 }
 202
 203                 /// <summary>
 204                 ///   Validates the guid string
 205                 /// </summary>
 206                 bool ValidateGuid (string guid)
 207                 {
 208                         try {
 209                                 new Guid (guid);
 210                                 return true;
 211                         } catch {
 212                                 Report.Error (647, Location, "Format of GUID is invalid: " + guid);
 213                                 return false;
 214                         }
 215                 }
 216
 217                 string GetFullMemberName (string member)
 218                 {
 219                         return Type.FullName + '.' + member;
 220                 }
 221
 222                 //
 223                 // Given an expression, if the expression is a valid attribute-argument-expression
 224                 // returns an object that can be used to encode it, or null on failure.
 225                 //
 226                 public static bool GetAttributeArgumentExpression (Expression e, Location loc, Type arg_type, out object result)
 227                 {
 228                         if (e is EnumConstant) {
 229                                 if (RootContext.StdLib)
 230                                         result = ((EnumConstant)e).GetValueAsEnumType ();
 231                                 else
 232                                         result = ((EnumConstant)e).GetValue ();
 233
 234                                 return true;
 235                         }
 236
 237                         Constant constant = e as Constant;
 238                         if (constant != null) {
 239                                 if (e.Type != arg_type) {
 240                                         constant = Const.ChangeType (loc, constant, arg_type);
 241                                         if (constant == null) {
 242                                                 result = null;
 243                                                 Error_AttributeArgumentNotValid (loc);
 244                                                 return false;
 245                                         }
 246                                 }
 247                                 result = constant.GetValue ();
 248                                 return true;
 249                         } else if (e is TypeOf) {
 250                                 result = ((TypeOf) e).TypeArg;
 251                                 return true;
 252                         } else if (e is ArrayCreation){
 253                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();
 254                                 if (result != null)
 255                                         return true;
 256                         } else if (e is EmptyCast) {
 257                                 Expression child = ((EmptyCast)e).Child;
 258                                 return GetAttributeArgumentExpression (child, loc, child.Type, out result);
 259                         }
 260
 261                         result = null;
 262                         Error_AttributeArgumentNotValid (loc);
 263                         return false;
 264                 }
 265
 266                 public CustomAttributeBuilder Resolve (EmitContext ec)
 267                 {
 268                         Type oldType = Type;
 269
 270                         // Sanity check.
 271                         Type = CheckAttributeType (ec);
 272
 273                         if (oldType == null && Type == null)
 274                                 return null;
 275                         if (oldType != null && oldType != Type){
 276                                 Report.Error (-27, Location,
 277                                               "Attribute {0} resolved to different types at different times: {1} vs. {2}",
 278                                               Name, oldType, Type);
 279                                 return null;
 280                         }
 281
 282                         if (Type.IsAbstract) {
 283                                 Report.Error (653, Location, "Cannot apply attribute class '{0}' because it is abstract", Name);
 284                                 return null;
 285                         }
 286
 287                         bool MethodImplAttr = false;
 288                         bool MarshalAsAttr = false;
 289                         bool GuidAttr = false;
 290                         bool usage_attr = false;
 291
 292                         bool DoCompares = true;
 293
 294                         //
 295                         // If we are a certain special attribute, we
 296                         // set the information accordingly
 297                         //
 298
 299                         if (Type == TypeManager.attribute_usage_type)
 300                                 usage_attr = true;
 301                         else if (Type == TypeManager.methodimpl_attr_type)
 302                                 MethodImplAttr = true;
 303                         else if (Type == TypeManager.marshal_as_attr_type)
 304                                 MarshalAsAttr = true;
 305                         else if (Type == TypeManager.guid_attr_type)
 306                                 GuidAttr = true;
 307                         else
 308                                 DoCompares = false;
 309
 310                         // Now we extract the positional and named arguments
 311
 312                         ArrayList pos_args = new ArrayList ();
 313                         ArrayList named_args = new ArrayList ();
 314                         int pos_arg_count = 0;
 315
 316                         if (Arguments != null) {
 317                                 pos_args = (ArrayList) Arguments [0];
 318                                 if (pos_args != null)
 319                                         pos_arg_count = pos_args.Count;
 320                                 if (Arguments.Count > 1)
 321                                         named_args = (ArrayList) Arguments [1];
 322                         }
 323
 324                         pos_values = new object [pos_arg_count];
 325
 326                         //
 327                         // First process positional arguments
 328                         //
 329
 330                         int i;
 331                         for (i = 0; i < pos_arg_count; i++) {
 332                                 Argument a = (Argument) pos_args [i];
 333                                 Expression e;
 334
 335                                 if (!a.Resolve (ec, Location))
 336                                         return null;
 337
 338                                 e = a.Expr;
 339
 340                                 object val;
 341                                 if (!GetAttributeArgumentExpression (e, Location, a.Type, out val))
 342                                         return null;
 343
 344                                 pos_values [i] = val;
 345
 346                                 if (DoCompares){
 347                                         if (usage_attr) {
 348                                                 if ((int)val == 0) {
 349                                                         Report.Error (591, Location, "Invalid value for argument to 'System.AttributeUsage' attribute");
 350                                                         return null;
 351                                                 }
 352                                                 usage_attribute = new AttributeUsageAttribute ((AttributeTargets)val);
 353                                         } else if (MethodImplAttr) {
 354                                                 this.ImplOptions = (MethodImplOptions) val;
 355                                         } else if (GuidAttr){
 356                                                 //
 357                                                 // we will later check the validity of the type
 358                                                 //
 359                                                 if (val is string){
 360                                                         if (!ValidateGuid ((string) val))
 361                                                                 return null;
 362                                                 }
 363
 364                                         } else if (MarshalAsAttr)
 365                                                 this.UnmanagedType =
 366                                                 (System.Runtime.InteropServices.UnmanagedType) val;
 367                                 }
 368                         }
 369
 370                         //
 371                         // Now process named arguments
 372                         //
 373
 374                         ArrayList field_infos = null;
 375                         ArrayList prop_infos  = null;
 376                         ArrayList field_values = null;
 377                         ArrayList prop_values = null;
 378
 379                         if (named_args.Count > 0) {
 380                                 field_infos = new ArrayList ();
 381                                 prop_infos  = new ArrayList ();
 382                                 field_values = new ArrayList ();
 383                                 prop_values = new ArrayList ();
 384                         }
 385
 386                         Hashtable seen_names = new Hashtable();
 387
 388                         for (i = 0; i < named_args.Count; i++) {
 389                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 390                                 string member_name = (string) de.Key;
 391                                 Argument a  = (Argument) de.Value;
 392                                 Expression e;
 393
 394                                 if (seen_names.Contains(member_name)) {
 395                                         Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
 396                                         return null;
 397                                 }
 398                                 seen_names.Add(member_name, 1);
 399
 400                                 if (!a.Resolve (ec, Location))
 401                                         return null;
 402
 403                                 Expression member = Expression.MemberLookup (
 404                                         ec, Type, member_name,
 405                                         MemberTypes.Field | MemberTypes.Property,
 406                                         BindingFlags.Public | BindingFlags.Instance,
 407                                         Location);
 408
 409                                 if (member == null) {
 410                                         member = Expression.MemberLookup (ec, Type, member_name,
 411                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 412                                                 Location);
 413
 414                                         if (member != null) {
 415                                                 Report.Error (122, Location, "'{0}' is inaccessible due to its protection level", GetFullMemberName (member_name));
 416                                                 return null;
 417                                         }
 418                                 }
 419
 420                                 if (member == null){
 421                                         Report.Error (117, Location, "Attribute `{0}' does not contain a definition for `{1}'",
 422                                                       Type, member_name);
 423                                         return null;
 424                                 }
 425
 426                                 if (!(member is PropertyExpr || member is FieldExpr)) {
 427                                         Error_InvalidNamedArgument (member_name);
 428                                         return null;
 429                                 }
 430
 431                                 e = a.Expr;
 432                                 if (member is PropertyExpr) {
 433                                         PropertyExpr pe = (PropertyExpr) member;
 434                                         PropertyInfo pi = pe.PropertyInfo;
 435
 436                                         if (!pi.CanWrite || !pi.CanRead) {
 437                                                 Report.SymbolRelatedToPreviousError (pi);
 438                                                 Error_InvalidNamedArgument (member_name);
 439                                                 return null;
 440                                         }
 441
 442                                         object value;
 443                                         if (!GetAttributeArgumentExpression (e, Location, pi.PropertyType, out value))
 444                                                 return null;
 445
 446                                         if (usage_attribute != null) {
 447                                                 if (member_name == "AllowMultiple")
 448                                                         usage_attribute.AllowMultiple = (bool) value;
 449                                                 if (member_name == "Inherited")
 450                                                         usage_attribute.Inherited = (bool) value;
 451                                         }
 452
 453                                         prop_values.Add (value);
 454                                         prop_infos.Add (pi);
 455
 456                                 } else if (member is FieldExpr) {
 457                                         FieldExpr fe = (FieldExpr) member;
 458                                         FieldInfo fi = fe.FieldInfo;
 459
 460                                         if (fi.IsInitOnly) {
 461                                                 Error_InvalidNamedArgument (member_name);
 462                                                 return null;
 463                                         }
 464
 465                                         object value;
 466                                         if (!GetAttributeArgumentExpression (e, Location, fi.FieldType, out value))
 467                                                 return null;
 468
 469                                         field_values.Add (value);
 470                                         field_infos.Add (fi);
 471                                 }
 472                         }
 473
 474                         Expression mg = Expression.MemberLookup (
 475                                 ec, Type, ".ctor", MemberTypes.Constructor,
 476                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 477                                 Location);
 478
 479                         if (mg == null) {
 480                                 Error_AttributeConstructorMismatch ();
 481                                 return null;
 482                         }
 483
 484                         MethodBase constructor = Invocation.OverloadResolve (
 485                                 ec, (MethodGroupExpr) mg, pos_args, false, Location);
 486
 487                         if (constructor == null) {
 488                                 return null;
 489                         }
 490
 491                         //
 492                         // Now we perform some checks on the positional args as they
 493                         // cannot be null for a constructor which expects a parameter
 494                         // of type object
 495                         //
 496
 497                         ParameterData pd = Invocation.GetParameterData (constructor);
 498
 499                         int last_real_param = pd.Count;
 500                         if (pd.HasParams) {
 501                                 // When the params is not filled we need to put one
 502                                 if (last_real_param > pos_arg_count) {
 503                                         object [] new_pos_values = new object [pos_arg_count + 1];
 504                                         pos_values.CopyTo (new_pos_values, 0);
 505                                         new_pos_values [pos_arg_count] = new object [] {} ;
 506                                         pos_values = new_pos_values;
 507                                 }
 508                                 last_real_param--;
 509                         }
 510
 511                         for (int j = 0; j < pos_arg_count; ++j) {
 512                                 Argument a = (Argument) pos_args [j];
 513
 514                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {
 515                                         Error_AttributeArgumentNotValid (Location);
 516                                         return null;
 517                                 }
 518
 519                                 if (j < last_real_param)
 520                                         continue;
 521
 522                                 if (j == last_real_param) {
 523                                         object [] array = new object [pos_arg_count - last_real_param];
 524                                         array [0] = pos_values [j];
 525                                         pos_values [j] = array;
 526                                         continue;
 527                                 }
 528
 529                                 object [] params_array = (object []) pos_values [last_real_param];
 530                                 params_array [j - last_real_param] = pos_values [j];
 531                         }
 532
 533                         // Adjust the size of the pos_values if it had params
 534                         if (last_real_param != pos_arg_count) {
 535                                 object [] new_pos_values = new object [last_real_param + 1];
 536                                 Array.Copy (pos_values, new_pos_values, last_real_param + 1);
 537                                 pos_values = new_pos_values;
 538                         }
 539
 540                         try {
 541                                 if (named_args.Count > 0) {
 542                                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 543                                         field_info_arr = new FieldInfo [field_infos.Count];
 544                                         field_values_arr = new object [field_values.Count];
 545                                         prop_values_arr = new object [prop_values.Count];
 546
 547                                         field_infos.CopyTo  (field_info_arr, 0);
 548                                         field_values.CopyTo (field_values_arr, 0);
 549
 550                                         prop_values.CopyTo  (prop_values_arr, 0);
 551                                         prop_infos.CopyTo   (prop_info_arr, 0);
 552
 553                                         cb = new CustomAttributeBuilder (
 554                                                 (ConstructorInfo) constructor, pos_values,
 555                                                 prop_info_arr, prop_values_arr,
 556                                                 field_info_arr, field_values_arr);
 557                                 }
 558                                 else
 559                                         cb = new CustomAttributeBuilder (
 560                                                 (ConstructorInfo) constructor, pos_values);
 561                         } catch (NullReferenceException) {
 562                                 //
 563                                 // Don't know what to do here
 564                                 //
 565                                 Report.Warning (
 566                                         -101, Location, "NullReferenceException while trying to create attribute." +
 567                                         "Something's wrong!");
 568                         } catch (Exception e) {
 569                                 //
 570                                 // Sample:
 571                                 // using System.ComponentModel;
 572                                 // [DefaultValue (CollectionChangeAction.Add)]
 573                                 // class X { static void Main () {} }
 574                                 //
 575                                 Report.Warning (
 576                                         -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);
 577                         }
 578
 579                         return cb;
 580                 }
 581
 582                 /// <summary>
 583                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 584                 /// </summary>
 585                 public string GetValidTargets ()
 586                 {
 587                         StringBuilder sb = new StringBuilder ();
 588                         AttributeTargets targets = GetAttributeUsage ().ValidOn;
 589
 590                         if ((targets & AttributeTargets.Assembly) != 0)
 591                                 sb.Append ("'assembly' ");
 592
 593                         if ((targets & AttributeTargets.Class) != 0)
 594                                 sb.Append ("'class' ");
 595
 596                         if ((targets & AttributeTargets.Constructor) != 0)
 597                                 sb.Append ("'constructor' ");
 598
 599                         if ((targets & AttributeTargets.Delegate) != 0)
 600                                 sb.Append ("'delegate' ");
 601
 602                         if ((targets & AttributeTargets.Enum) != 0)
 603                                 sb.Append ("'enum' ");
 604
 605                         if ((targets & AttributeTargets.Event) != 0)
 606                                 sb.Append ("'event' ");
 607
 608                         if ((targets & AttributeTargets.Field) != 0)
 609                                 sb.Append ("'field' ");
 610
 611                         if ((targets & AttributeTargets.Interface) != 0)
 612                                 sb.Append ("'interface' ");
 613
 614                         if ((targets & AttributeTargets.Method) != 0)
 615                                 sb.Append ("'method' ");
 616
 617                         if ((targets & AttributeTargets.Module) != 0)
 618                                 sb.Append ("'module' ");
 619
 620                         if ((targets & AttributeTargets.Parameter) != 0)
 621                                 sb.Append ("'parameter' ");
 622
 623                         if ((targets & AttributeTargets.Property) != 0)
 624                                 sb.Append ("'property' ");
 625
 626                         if ((targets & AttributeTargets.ReturnValue) != 0)
 627                                 sb.Append ("'return' ");
 628
 629                         if ((targets & AttributeTargets.Struct) != 0)
 630                                 sb.Append ("'struct' ");
 631
 632                         return sb.ToString ();
 633
 634                 }
 635
 636                 /// <summary>
 637                 /// Returns AttributeUsage attribute for this type
 638                 /// </summary>
 639                 public AttributeUsageAttribute GetAttributeUsage ()
 640                 {
 641                         AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
 642                         if (ua != null)
 643                                 return ua;
 644
 645                         Class attr_class = TypeManager.LookupClass (Type);
 646
 647                         if (attr_class == null) {
 648                                 object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 649                                 ua = (AttributeUsageAttribute)usage_attr [0];
 650                                 usage_attr_cache.Add (Type, ua);
 651                                 return ua;
 652                         }
 653
 654                         return attr_class.AttributeUsage;
 655                 }
 656
 657                 /// <summary>
 658                 /// Returns custom name of indexer
 659                 /// </summary>
 660                 public string GetIndexerAttributeValue (EmitContext ec)
 661                 {
 662                         if (pos_values == null) {
 663                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 664                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 665                                 Resolve (ec);
 666                         }
 667
 668                         return pos_values [0] as string;
 669                 }
 670
 671                 /// <summary>
 672                 /// Returns condition of ConditionalAttribute
 673                 /// </summary>
 674                 public string GetConditionalAttributeValue (DeclSpace ds)
 675                 {
 676                         if (pos_values == null) {
 677                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 678
 679                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 680                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 681                                 Resolve (ec);
 682                         }
 683
 684                         // Some error occurred
 685                         if (pos_values [0] == null)
 686                                 return null;
 687
 688                         return (string)pos_values [0];
 689                 }
 690
 691                 /// <summary>
 692                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 693                 /// </summary>
 694                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 695                 {
 696                         if (pos_values == null) {
 697                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 698
 699                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 700                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 701                                 Resolve (ec);
 702                         }
 703
 704                         // Some error occurred
 705                         if (pos_values == null)
 706                                 return null;
 707
 708                         if (pos_values.Length == 0)
 709                                 return new ObsoleteAttribute ();
 710
 711                         if (pos_values.Length == 1)
 712                                 return new ObsoleteAttribute ((string)pos_values [0]);
 713
 714                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 715                 }
 716
 717                 /// <summary>
 718                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 719                 /// before ApplyAttribute. We need to resolve the arguments.
 720                 /// This situation occurs when class deps is differs from Emit order.
 721                 /// </summary>
 722                 public bool GetClsCompliantAttributeValue (DeclSpace ds)
 723                 {
 724                         if (pos_values == null) {
 725                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 726
 727                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 728                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 729                                 Resolve (ec);
 730                         }
 731
 732                         // Some error occurred
 733                         if (pos_values [0] == null)
 734                                 return false;
 735
 736                         return (bool)pos_values [0];
 737                 }
 738
 739                 /// <summary>
 740                 /// Tests permitted SecurityAction for assembly or other types
 741                 /// </summary>
 742                 public bool CheckSecurityActionValidity (bool for_assembly)
 743                 {
 744                         SecurityAction action  = GetSecurityActionValue ();
 745
 746                         if ((action == SecurityAction.RequestMinimum || action == SecurityAction.RequestOptional || action == SecurityAction.RequestRefuse) && for_assembly)
 747                                 return true;
 748
 749                         if (!for_assembly) {
 750                                 if (action < SecurityAction.Demand || action > SecurityAction.InheritanceDemand) {
 751                                         Error_AttributeEmitError ("SecurityAction is out of range");
 752                                         return false;
 753                                 }
 754
 755                                 if ((action != SecurityAction.RequestMinimum && action != SecurityAction.RequestOptional && action != SecurityAction.RequestRefuse) && !for_assembly)
 756                                         return true;
 757                         }
 758
 759                         Error_AttributeEmitError (String.Concat ("SecurityAction '", action, "' is not valid for this declaration"));
 760                         return false;
 761                 }
 762
 763                 System.Security.Permissions.SecurityAction GetSecurityActionValue ()
 764                 {
 765                         return (SecurityAction)pos_values [0];
 766                 }
 767
 768                 /// <summary>
 769                 /// Creates instance of SecurityAttribute class and add result of CreatePermission method to permission table.
 770                 /// </summary>
 771                 /// <returns></returns>
 772                 public void ExtractSecurityPermissionSet (ListDictionary permissions)
 773                 {
 774                         if (TypeManager.LookupDeclSpace (Type) != null && RootContext.StdLib) {
 775                                 Error_AttributeEmitError ("security custom attributes can not be referenced from defining assembly");
 776                                 return;
 777                         }
 778
 779                         SecurityAttribute sa;
 780                         // For all assemblies except corlib we can avoid all hacks
 781                         if (RootContext.StdLib) {
 782                                 sa = (SecurityAttribute) Activator.CreateInstance (Type, pos_values);
 783
 784                                 if (prop_info_arr != null) {
 785                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 786                                                 PropertyInfo pi = prop_info_arr [i];
 787                                                 pi.SetValue (sa, prop_values_arr [i], null);
 788                                         }
 789                                 }
 790                         } else {
 791                                 Type temp_type = Type.GetType (Type.FullName);
 792                                 // HACK: All mscorlib attributes have same ctor syntax
 793                                 sa = (SecurityAttribute) Activator.CreateInstance (temp_type, new object[] { GetSecurityActionValue () } );
 794
 795                                 // All types are from newly created corlib but for invocation with old we need to convert them
 796                                 if (prop_info_arr != null) {
 797                                         for (int i = 0; i < prop_info_arr.Length; ++i) {
 798                                                 PropertyInfo emited_pi = prop_info_arr [i];
 799                                                 PropertyInfo pi = temp_type.GetProperty (emited_pi.Name, emited_pi.PropertyType);
 800
 801                                                 object old_instance = pi.PropertyType.IsEnum ?
 802                                                         System.Enum.ToObject (pi.PropertyType, prop_values_arr [i]) :
 803                                                         prop_values_arr [i];
 804
 805                                                 pi.SetValue (sa, old_instance, null);
 806                                         }
 807                                 }
 808                         }
 809
 810                         IPermission perm = sa.CreatePermission ();
 811                         SecurityAction action;
 812
 813                         // IS is correct because for corlib we are using an instance from old corlib
 814                         if (perm is System.Security.CodeAccessPermission) {
 815                                 action = GetSecurityActionValue ();
 816                         } else {
 817                                 switch (GetSecurityActionValue ()) {
 818                                         case SecurityAction.Demand:
 819                                                 action = (SecurityAction)13;
 820                                                 break;
 821                                         case SecurityAction.LinkDemand:
 822                                                 action = (SecurityAction)14;
 823                                                 break;
 824                                         case SecurityAction.InheritanceDemand:
 825                                                 action = (SecurityAction)15;
 826                                                 break;
 827                                         default:
 828                                                 Error_AttributeEmitError ("Invalid SecurityAction for non-Code Access Security permission");
 829                                                 return;
 830                                 }
 831                         }
 832
 833                         PermissionSet ps = (PermissionSet)permissions [action];
 834                         if (ps == null) {
 835                                 ps = new PermissionSet (PermissionState.None);
 836                                 permissions.Add (action, ps);
 837                         }
 838                         ps.AddPermission (sa.CreatePermission ());
 839                 }
 840
 841                 object GetValue (object value)
 842                 {
 843                         if (value is EnumConstant)
 844                                 return ((EnumConstant) value).GetValue ();
 845                         else
 846                                 return value;
 847                 }
 848
 849                 public object GetPositionalValue (int i)
 850                 {
 851                         return (pos_values == null) ? null : pos_values[i];
 852                 }
 853
 854                 object GetFieldValue (string name)
 855                 {
 856                         int i;
 857                         if (field_info_arr == null)
 858                                 return null;
 859                         i = 0;
 860                         foreach (FieldInfo fi in field_info_arr) {
 861                                 if (fi.Name == name)
 862                                         return GetValue (field_values_arr [i]);
 863                                 i++;
 864                         }
 865                         return null;
 866                 }
 867
 868                 public UnmanagedMarshal GetMarshal (Attributable attr)
 869                 {
 870                         object value = GetFieldValue ("SizeParamIndex");
 871                         if (value != null && UnmanagedType != UnmanagedType.LPArray) {
 872                                 Error_AttributeEmitError ("SizeParamIndex field is not valid for the specified unmanaged type");
 873                                 return null;
 874                         }
 875
 876                         object o = GetFieldValue ("ArraySubType");
 877                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;
 878
 879                         switch (UnmanagedType) {
 880                         case UnmanagedType.CustomMarshaler:
 881                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
 882                                                                        BindingFlags.Static | BindingFlags.Public);
 883                                 if (define_custom == null) {
 884                                         Report.RuntimeMissingSupport (Location, "set marshal info");
 885                                         return null;
 886                                 }
 887
 888                                 object [] args = new object [4];
 889                                 args [0] = GetFieldValue ("MarshalTypeRef");
 890                                 args [1] = GetFieldValue ("MarshalCookie");
 891                                 args [2] = GetFieldValue ("MarshalType");
 892                                 args [3] = Guid.Empty;
 893                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
 894
 895                         case UnmanagedType.LPArray:
 896                                 return UnmanagedMarshal.DefineLPArray (array_sub_type);
 897
 898                         case UnmanagedType.SafeArray:
 899                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
 900
 901                         case UnmanagedType.ByValArray:
 902                                 FieldMember fm = attr as FieldMember;
 903                                 if (fm == null) {
 904                                         Error_AttributeEmitError ("Specified unmanaged type is only valid on fields");
 905                                         return null;
 906                                 }
 907                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
 908
 909                         case UnmanagedType.ByValTStr:
 910                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
 911
 912                         default:
 913                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
 914                         }
 915                 }
 916
 917                 public bool IsInternalCall
 918                 {
 919                         get { return ImplOptions == MethodImplOptions.InternalCall; }
 920                 }
 921
 922                 /// <summary>
 923                 /// Emit attribute for Attributable symbol
 924                 /// </summary>
 925                 public void Emit (EmitContext ec, Attributable ias, ListDictionary emitted_attr)
 926                 {
 927                         CustomAttributeBuilder cb = Resolve (ec);
 928                         if (cb == null)
 929                                 return;
 930
 931                         AttributeUsageAttribute usage_attr = GetAttributeUsage ();
 932                         if ((usage_attr.ValidOn & Target) == 0) {
 933                                 Report.Error (592, Location, "Attribute '{0}' is not valid on this declaration type. It is valid on {1} declarations only.", Name, GetValidTargets ());
 934                                 return;
 935                         }
 936
 937                         ias.ApplyAttributeBuilder (this, cb);
 938
 939                         if (!usage_attr.AllowMultiple) {
 940                                 ArrayList emitted_targets = (ArrayList)emitted_attr [Type];
 941                                 if (emitted_targets == null) {
 942                                         emitted_targets = new ArrayList ();
 943                                         emitted_attr.Add (Type, emitted_targets);
 944                                 } else if (emitted_targets.Contains (Target)) {
 945                                         Report.Error (579, Location, "Duplicate '" + Name + "' attribute");
 946                                         return;
 947                                 }
 948                                 emitted_targets.Add (Target);
 949                         }
 950
 951                         if (!RootContext.VerifyClsCompliance)
 952                                 return;
 953
 954                         // Here we are testing attribute arguments for array usage (error 3016)
 955                         if (ias.IsClsCompliaceRequired (ec.DeclSpace)) {
 956                                 if (Arguments == null)
 957                                         return;
 958
 959                                 ArrayList pos_args = (ArrayList) Arguments [0];
 960                                 if (pos_args != null) {
 961                                         foreach (Argument arg in pos_args) {
 962                                                 // Type is undefined (was error 246)
 963                                                 if (arg.Type == null)
 964                                                         return;
 965
 966                                                 if (arg.Type.IsArray) {
 967                                                         Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 968                                                         return;
 969                                                 }
 970                                         }
 971                                 }
 972
 973                                 if (Arguments.Count < 2)
 974                                         return;
 975
 976                                 ArrayList named_args = (ArrayList) Arguments [1];
 977                                 foreach (DictionaryEntry de in named_args) {
 978                                         Argument arg  = (Argument) de.Value;
 979
 980                                         // Type is undefined (was error 246)
 981                                         if (arg.Type == null)
 982                                                 return;
 983
 984                                         if (arg.Type.IsArray) {
 985                                                 Report.Error (3016, Location, "Arrays as attribute arguments are not CLS-compliant");
 986                                                 return;
 987                                         }
 988                                 }
 989                         }
 990                 }
 991
 992                 public object GetValue (EmitContext ec, Constant c, Type target)
 993                 {
 994                         if (Convert.ImplicitConversionExists (ec, c, target))
 995                                 return c.GetValue ();
 996
 997                         Convert.Error_CannotImplicitConversion (Location, c.Type, target);
 998                         return null;
 999                 }
1000
1001                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,
1002                                                           MethodAttributes flags, Type ret_type, Type [] param_types)
1003                 {
1004                         //
1005                         // We extract from the attribute the information we need
1006                         //
1007
1008                         if (Arguments == null) {
1009                                 Console.WriteLine ("Internal error : this is not supposed to happen !");
1010                                 return null;
1011                         }
1012
1013                         ResolveType (ec);
1014                         if (Type == null)
1015                                 return null;
1016
1017                         ArrayList named_args = new ArrayList ();
1018
1019                         ArrayList pos_args = (ArrayList) Arguments [0];
1020                         if (Arguments.Count > 1)
1021                                 named_args = (ArrayList) Arguments [1];
1022
1023
1024                         string dll_name = null;
1025
1026                         Argument tmp = (Argument) pos_args [0];
1027
1028                         if (!tmp.Resolve (ec, Location))
1029                                 return null;
1030
1031                         if (tmp.Expr is Constant)
1032                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();
1033                         else {
1034                                 Error_AttributeArgumentNotValid (Location);
1035                                 return null;
1036                         }
1037
1038                         // Now we process the named arguments
1039                         CallingConvention cc = CallingConvention.Winapi;
1040                         CharSet charset = CharSet.Ansi;
1041                         bool preserve_sig = true;
1042 #if FIXME
1043                         bool exact_spelling = false;
1044 #endif
1045                         bool set_last_err = false;
1046                         string entry_point = null;
1047
1048                         for (int i = 0; i < named_args.Count; i++) {
1049
1050                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
1051
1052                                 string member_name = (string) de.Key;
1053                                 Argument a  = (Argument) de.Value;
1054
1055                                 if (!a.Resolve (ec, Location))
1056                                         return null;
1057
1058                                 Expression member = Expression.MemberLookup (
1059                                         ec, Type, member_name,
1060                                         MemberTypes.Field | MemberTypes.Property,
1061                                         BindingFlags.Public | BindingFlags.Instance,
1062                                         Location);
1063
1064                                 if (member == null || !(member is FieldExpr)) {
1065                                         Error_InvalidNamedArgument (member_name);
1066                                         return null;
1067                                 }
1068
1069                                 if (member is FieldExpr) {
1070                                         FieldExpr fe = (FieldExpr) member;
1071                                         FieldInfo fi = fe.FieldInfo;
1072
1073                                         if (fi.IsInitOnly) {
1074                                                 Error_InvalidNamedArgument (member_name);
1075                                                 return null;
1076                                         }
1077
1078                                         if (a.Expr is Constant) {
1079                                                 Constant c = (Constant) a.Expr;
1080
1081                                                 try {
1082                                                         if (member_name == "CallingConvention"){
1083                                                                 object val = GetValue (ec, c, typeof (CallingConvention));
1084                                                                 if (val == null)
1085                                                                         return null;
1086                                                                 cc = (CallingConvention) val;
1087                                                         } else if (member_name == "CharSet"){
1088                                                                 charset = (CharSet) c.GetValue ();
1089                                                         } else if (member_name == "EntryPoint")
1090                                                                 entry_point = (string) c.GetValue ();
1091                                                         else if (member_name == "SetLastError")
1092                                                                 set_last_err = (bool) c.GetValue ();
1093 #if FIXME
1094                                                         else if (member_name == "ExactSpelling")
1095                                                                 exact_spelling = (bool) c.GetValue ();
1096 #endif
1097                                                         else if (member_name == "PreserveSig")
1098                                                                 preserve_sig = (bool) c.GetValue ();
1099                                                 } catch (InvalidCastException){
1100                                                         Error_InvalidNamedArgument (member_name);
1101                                                         Error_AttributeArgumentNotValid (Location);
1102                                                 }
1103                                         } else {
1104                                                 Error_AttributeArgumentNotValid (Location);
1105                                                 return null;
1106                                         }
1107
1108                                 }
1109                         }
1110
1111                         if (entry_point == null)
1112                                 entry_point = name;
1113                         if (set_last_err)
1114                                 charset = (CharSet)((int)charset | 0x40);
1115
1116                         MethodBuilder mb = builder.DefinePInvokeMethod (
1117                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,
1118                                 CallingConventions.Standard,
1119                                 ret_type,
1120                                 param_types,
1121                                 cc,
1122                                 charset);
1123
1124                         if (preserve_sig)
1125                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);
1126
1127                         return mb;
1128                 }
1129
1130                 private Expression GetValue ()
1131                 {
1132                         if ((Arguments == null) || (Arguments.Count < 1))
1133                                 return null;
1134                         ArrayList al = (ArrayList) Arguments [0];
1135                         if ((al == null) || (al.Count < 1))
1136                                 return null;
1137                         Argument arg = (Argument) al [0];
1138                         if ((arg == null) || (arg.Expr == null))
1139                                 return null;
1140                         return arg.Expr;
1141                 }
1142
1143                 public string GetString ()
1144                 {
1145                         Expression e = GetValue ();
1146                         if (e is StringLiteral)
1147                                 return (e as StringLiteral).Value;
1148                         return null;
1149                 }
1150
1151                 public bool GetBoolean ()
1152                 {
1153                         Expression e = GetValue ();
1154                         if (e is BoolLiteral)
1155                                 return (e as BoolLiteral).Value;
1156                         return false;
1157                 }
1158         }
1159
1160
1161         /// <summary>
1162         /// For global attributes (assembly, module) we need special handling.
1163         /// Attributes can be located in the several files
1164         /// </summary>
1165         public class GlobalAttribute: Attribute
1166         {
1167                 public readonly NamespaceEntry ns;
1168
1169                 public GlobalAttribute (TypeContainer container, string target, string name, ArrayList args, Location loc):
1170                         base (target, name, args, loc)
1171                 {
1172                         ns = container.NamespaceEntry;
1173                 }
1174
1175                 protected override Type CheckAttributeType (EmitContext ec)
1176                 {
1177                         // RootContext.Tree.Types has a single NamespaceEntry which gets overwritten
1178                         // each time a new file is parsed.  However, we need to use the NamespaceEntry
1179                         // in effect where the attribute was used.  Since code elsewhere cannot assume
1180                         // that the NamespaceEntry is right, just overwrite it.
1181                         //
1182                         // FIXME: Check every place the NamespaceEntry of RootContext.Tree.Types is used
1183                         //        to ensure the right one is used.
1184                         if (ec.DeclSpace == RootContext.Tree.Types)
1185                                 ec.DeclSpace.NamespaceEntry = ns;
1186
1187                         return base.CheckAttributeType (ec);
1188                 }
1189         }
1190
1191         public class Attributes {
1192                 public ArrayList Attrs;
1193
1194                 public Attributes (Attribute a)
1195                 {
1196                         Attrs = new ArrayList ();
1197                         Attrs.Add (a);
1198                 }
1199
1200                 public Attributes (ArrayList attrs)
1201                 {
1202                         Attrs = attrs;
1203                 }
1204
1205                 public void AddAttributes (ArrayList attrs)
1206                 {
1207                         Attrs.AddRange (attrs);
1208                 }
1209
1210                 /// <summary>
1211                 /// Checks whether attribute target is valid for the current element
1212                 /// </summary>
1213                 public bool CheckTargets (Attributable member)
1214                 {
1215                         string[] valid_targets = member.ValidAttributeTargets;
1216                         foreach (Attribute a in Attrs) {
1217                                 if (a.ExplicitTarget == null || a.ExplicitTarget == valid_targets [0]) {
1218                                         a.Target = member.AttributeTargets;
1219                                         continue;
1220                                 }
1221
1222                                 // TODO: we can skip the first item
1223                                 if (((IList) valid_targets).Contains (a.ExplicitTarget)) {
1224                                         switch (a.ExplicitTarget) {
1225                                                 case "return": a.Target = AttributeTargets.ReturnValue; continue;
1226                                                 case "param": a.Target = AttributeTargets.Parameter; continue;
1227                                                 case "field": a.Target = AttributeTargets.Field; continue;
1228                                                 case "method": a.Target = AttributeTargets.Method; continue;
1229                                                 case "property": a.Target = AttributeTargets.Property; continue;
1230                                         }
1231                                         throw new InternalErrorException ("Unknown explicit target: " + a.ExplicitTarget);
1232                                 }
1233
1234                                 StringBuilder sb = new StringBuilder ();
1235                                 foreach (string s in valid_targets) {
1236                                         sb.Append (s);
1237                                         sb.Append (", ");
1238                                 }
1239                                 sb.Remove (sb.Length - 2, 2);
1240                                 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 ());
1241                                 return false;
1242                         }
1243                         return true;
1244                 }
1245
1246                 public Attribute Search (Type t, EmitContext ec)
1247                 {
1248                         foreach (Attribute a in Attrs) {
1249                                 if (a.ResolveType (ec) == t)
1250                                         return a;
1251                         }
1252                         return null;
1253                 }
1254
1255                 /// <summary>
1256                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1257                 /// </summary>
1258                 public Attribute[] SearchMulti (Type t, EmitContext ec)
1259                 {
1260                         ArrayList ar = null;
1261
1262                         foreach (Attribute a in Attrs) {
1263                                 if (a.ResolveType (ec) == t) {
1264                                         if (ar == null)
1265                                                 ar = new ArrayList ();
1266                                         ar.Add (a);
1267                                 }
1268                         }
1269
1270                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1271                 }
1272
1273                 public void Emit (EmitContext ec, Attributable ias)
1274                 {
1275                         if (!CheckTargets (ias))
1276                                 return;
1277
1278                         ListDictionary ld = new ListDictionary ();
1279
1280                         foreach (Attribute a in Attrs)
1281                                 a.Emit (ec, ias, ld);
1282                 }
1283
1284                 public bool Contains (Type t, EmitContext ec)
1285                 {
1286                         return Search (t, ec) != null;
1287                 }
1288         }
1289
1290         /// <summary>
1291         /// Helper class for attribute verification routine.
1292         /// </summary>
1293         sealed class AttributeTester
1294         {
1295                 static PtrHashtable analyzed_types = new PtrHashtable ();
1296                 static PtrHashtable analyzed_types_obsolete = new PtrHashtable ();
1297                 static PtrHashtable analyzed_member_obsolete = new PtrHashtable ();
1298                 static PtrHashtable analyzed_method_excluded = new PtrHashtable ();
1299
1300                 private AttributeTester ()
1301                 {
1302                 }
1303
1304                 /// <summary>
1305                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1306                 /// It tests differing only in ref or out, or in array rank.
1307                 /// </summary>
1308                 public static bool AreOverloadedMethodParamsClsCompliant (Type[] types_a, Type[] types_b)
1309                 {
1310                         if (types_a == null || types_b == null)
1311                                 return true;
1312
1313                         if (types_a.Length != types_b.Length)
1314                                 return true;
1315
1316                         for (int i = 0; i < types_b.Length; ++i) {
1317                                 Type aType = types_a [i];
1318                                 Type bType = types_b [i];
1319
1320                                 if (aType.IsArray && bType.IsArray && aType.GetArrayRank () != bType.GetArrayRank () && aType.GetElementType () == bType.GetElementType ()) {
1321                                         return false;
1322                                 }
1323
1324                                 Type aBaseType = aType;
1325                                 bool is_either_ref_or_out = false;
1326
1327                                 if (aType.IsByRef || aType.IsPointer) {
1328                                         aBaseType = aType.GetElementType ();
1329                                         is_either_ref_or_out = true;
1330                                 }
1331
1332                                 Type bBaseType = bType;
1333                                 if (bType.IsByRef || bType.IsPointer)
1334                                 {
1335                                         bBaseType = bType.GetElementType ();
1336                                         is_either_ref_or_out = !is_either_ref_or_out;
1337                                 }
1338
1339                                 if (aBaseType != bBaseType)
1340                                         continue;
1341
1342                                 if (is_either_ref_or_out)
1343                                         return false;
1344                         }
1345                         return true;
1346                 }
1347
1348                 /// <summary>
1349                 /// Goes through all parameters and test if they are CLS-Compliant.
1350                 /// </summary>
1351                 public static bool AreParametersCompliant (Parameter[] fixedParameters, Location loc)
1352                 {
1353                         if (fixedParameters == null)
1354                                 return true;
1355
1356                         foreach (Parameter arg in fixedParameters) {
1357                                 if (!AttributeTester.IsClsCompliant (arg.ParameterType)) {
1358                                         Report.Error (3001, loc, "Argument type '{0}' is not CLS-compliant", arg.GetSignatureForError ());
1359                                         return false;
1360                                 }
1361                         }
1362                         return true;
1363                 }
1364
1365
1366                 /// <summary>
1367                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1368                 /// </summary>
1369                 public static bool IsClsCompliant (Type type)
1370                 {
1371                         if (type == null)
1372                                 return true;
1373
1374                         object type_compliance = analyzed_types[type];
1375                         if (type_compliance != null)
1376                                 return type_compliance == TRUE;
1377
1378                         if (type.IsPointer) {
1379                                 analyzed_types.Add (type, null);
1380                                 return false;
1381                         }
1382
1383                         bool result;
1384                         if (type.IsArray || type.IsByRef)       {
1385                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1386                         } else {
1387                                 result = AnalyzeTypeCompliance (type);
1388                         }
1389                         analyzed_types.Add (type, result ? TRUE : FALSE);
1390                         return result;
1391                 }
1392
1393                 static object TRUE = new object ();
1394                 static object FALSE = new object ();
1395
1396                 public static void VerifyModulesClsCompliance ()
1397                 {
1398                         Module[] modules = TypeManager.Modules;
1399                         if (modules == null)
1400                                 return;
1401
1402                         // The first module is generated assembly
1403                         for (int i = 1; i < modules.Length; ++i) {
1404                                 Module module = modules [i];
1405                                 if (!IsClsCompliant (module)) {
1406                                         Report.Error (3013, "Added modules must be marked with the CLSCompliant attribute to match the assembly", module.Name);
1407                                         return;
1408                                 }
1409                         }
1410                 }
1411
1412                 /// <summary>
1413                 /// Tests container name for CLS-Compliant name (differing only in case)
1414                 /// </summary>
1415                 public static void VerifyTopLevelNameClsCompliance ()
1416                 {
1417                         Hashtable locase_table = new Hashtable ();
1418
1419                         // Convert imported type names to lower case and ignore not cls compliant
1420                         foreach (DictionaryEntry de in TypeManager.all_imported_types) {
1421                                 Type t = (Type)de.Value;
1422                                 if (!AttributeTester.IsClsCompliant (t))
1423                                         continue;
1424
1425                                 locase_table.Add (((string)de.Key).ToLower (System.Globalization.CultureInfo.InvariantCulture), t);
1426                         }
1427
1428                         foreach (DictionaryEntry de in RootContext.Tree.Decls) {
1429                                 DeclSpace decl = (DeclSpace)de.Value;
1430                                 if (!decl.IsClsCompliaceRequired (decl))
1431                                         continue;
1432
1433                                 string lcase = decl.Name.ToLower (System.Globalization.CultureInfo.InvariantCulture);
1434                                 if (!locase_table.Contains (lcase)) {
1435                                         locase_table.Add (lcase, decl);
1436                                         continue;
1437                                 }
1438
1439                                 object conflict = locase_table [lcase];
1440                                 if (conflict is Type)
1441                                         Report.SymbolRelatedToPreviousError ((Type)conflict);
1442                                 else
1443                                         Report.SymbolRelatedToPreviousError ((MemberCore)conflict);
1444
1445                                 Report.Error (3005, decl.Location, "Identifier '{0}' differing only in case is not CLS-compliant", decl.GetSignatureForError ());
1446                         }
1447                 }
1448
1449                 static bool IsClsCompliant (ICustomAttributeProvider attribute_provider)
1450                 {
1451                         object[] CompliantAttribute = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1452                         if (CompliantAttribute.Length == 0)
1453                                 return false;
1454
1455                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1456                 }
1457
1458                 static bool AnalyzeTypeCompliance (Type type)
1459                 {
1460                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1461                         if (ds != null) {
1462                                 return ds.IsClsCompliaceRequired (ds.Parent);
1463                         }
1464
1465                         object[] CompliantAttribute = type.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1466                         if (CompliantAttribute.Length == 0)
1467                                 return IsClsCompliant (type.Assembly);
1468
1469                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1470                 }
1471
1472                 /// <summary>
1473                 /// Returns instance of ObsoleteAttribute when type is obsolete
1474                 /// </summary>
1475                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1476                 {
1477                         object type_obsolete = analyzed_types_obsolete [type];
1478                         if (type_obsolete == FALSE)
1479                                 return null;
1480
1481                         if (type_obsolete != null)
1482                                 return (ObsoleteAttribute)type_obsolete;
1483
1484                         ObsoleteAttribute result = null;
1485                         if (type.IsByRef || type.IsArray || type.IsPointer) {
1486                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1487                         } else {
1488                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1489
1490                                 // Type is external, we can get attribute directly
1491                                 if (type_ds == null) {
1492                                         object[] attribute = type.GetCustomAttributes (TypeManager.obsolete_attribute_type, false);
1493                                         if (attribute.Length == 1)
1494                                                 result = (ObsoleteAttribute)attribute [0];
1495                                 } else {
1496                                         result = type_ds.GetObsoleteAttribute (type_ds);
1497                                 }
1498                         }
1499
1500                         analyzed_types_obsolete.Add (type, result == null ? FALSE : result);
1501                         return result;
1502                 }
1503
1504                 /// <summary>
1505                 /// Returns instance of ObsoleteAttribute when method is obsolete
1506                 /// </summary>
1507                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1508                 {
1509                         IMethodData mc = TypeManager.GetMethod (mb);
1510                         if (mc != null)
1511                                 return mc.GetObsoleteAttribute ();
1512
1513                         // compiler generated methods are not registered by AddMethod
1514                         if (mb.DeclaringType is TypeBuilder)
1515                                 return null;
1516
1517                         return GetMemberObsoleteAttribute (mb);
1518                 }
1519
1520                 /// <summary>
1521                 /// Returns instance of ObsoleteAttribute when member is obsolete
1522                 /// </summary>
1523                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1524                 {
1525                         object type_obsolete = analyzed_member_obsolete [mi];
1526                         if (type_obsolete == FALSE)
1527                                 return null;
1528
1529                         if (type_obsolete != null)
1530                                 return (ObsoleteAttribute)type_obsolete;
1531
1532                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false) as ObsoleteAttribute;
1533                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1534                         return oa;
1535                 }
1536
1537                 /// <summary>
1538                 /// Common method for Obsolete error/warning reporting.
1539                 /// </summary>
1540                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1541                 {
1542                         if (oa.IsError) {
1543                                 Report.Error (619, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1544                                 return;
1545                         }
1546
1547                         if (oa.Message == null) {
1548                                 Report.Warning (612, loc, "'{0}' is obsolete", member);
1549                                 return;
1550                         }
1551                         if (RootContext.WarningLevel >= 2)
1552                                 Report.Warning (618, loc, "'{0}' is obsolete: '{1}'", member, oa.Message);
1553                 }
1554
1555                 public static bool IsConditionalMethodExcluded (MethodBase mb)
1556                 {
1557                         object excluded = analyzed_method_excluded [mb];
1558                         if (excluded != null)
1559                                 return excluded == TRUE ? true : false;
1560
1561                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (TypeManager.conditional_attribute_type, true) as ConditionalAttribute[];
1562                         if (attrs.Length == 0) {
1563                                 analyzed_method_excluded.Add (mb, FALSE);
1564                                 return false;
1565                         }
1566
1567                         foreach (ConditionalAttribute a in attrs) {
1568                                 if (RootContext.AllDefines.Contains (a.ConditionString)) {
1569                                         analyzed_method_excluded.Add (mb, FALSE);
1570                                         return false;
1571                                 }
1572                         }
1573                         analyzed_method_excluded.Add (mb, TRUE);
1574                         return true;
1575                 }
1576         }
1577 }