mcs/gmcs/attribute.cs

   1 //
   2 // attribute.cs: Attribute Handler
   3 //
   4 // Author: Ravi Pratap (ravi@ximian.com)
   5 //
   6 // Licensed under the terms of the GNU GPL
   7 //
   8 // (C) 2001 Ximian, Inc (http://www.ximian.com)
   9 //
  10 //
  11
  12 using System;
  13 using System.Diagnostics;
  14 using System.Collections;
  15 using System.Collections.Specialized;
  16 using System.Reflection;
  17 using System.Reflection.Emit;
  18 using System.Runtime.InteropServices;
  19 using System.Runtime.CompilerServices;
  20 using System.Text;
  21
  22 namespace Mono.CSharp {
  23
  24         /// <summary>
  25         ///   Base class for objects that can have Attributes applied to them.
  26         /// </summary>
  27         public abstract class Attributable {
  28                 /// <summary>
  29                 ///   Attributes for this type
  30                 /// </summary>
  31                 Attributes attributes;
  32
  33                 public Attributable(Attributes attrs)
  34                 {
  35                         attributes = attrs;
  36                         if (attributes != null)
  37                                 attributes.CheckTargets (ValidAttributeTargets);
  38                 }
  39
  40                 public Attributes OptAttributes
  41                 {
  42                         get {
  43                                 return attributes;
  44                         }
  45                         set {
  46                                 attributes = value;
  47                                 if (attributes != null)
  48                                         attributes.CheckTargets (ValidAttributeTargets);
  49                         }
  50                 }
  51
  52                 /// <summary>
  53                 /// Use member-specific procedure to apply attribute @a in @cb to the entity being built in @builder
  54                 /// </summary>
  55                 public abstract void ApplyAttributeBuilder (Attribute a, CustomAttributeBuilder cb);
  56
  57                 /// <summary>
  58                 /// Returns combination of enabled AttributeTargets
  59                 /// </summary>
  60                 public abstract AttributeTargets AttributeTargets { get; }
  61
  62                 public abstract bool IsClsCompliaceRequired (DeclSpace ds);
  63
  64                 /// <summary>
  65                 /// Gets list of valid attribute targets for explicit target declaration.
  66                 /// The first array item is default target. Don't break this rule.
  67                 /// </summary>
  68                 protected abstract string[] ValidAttributeTargets { get; }
  69         };
  70
  71         public class Attribute {
  72                 public string Target;
  73                 public readonly string    Name;
  74                 public readonly ArrayList Arguments;
  75
  76                 public readonly Location Location;
  77
  78                 public Type Type;
  79
  80                 // Is non-null if type is AttributeUsageAttribute
  81                 AttributeUsageAttribute usage_attribute;
  82
  83                 public AttributeUsageAttribute UsageAttribute {
  84                         get {
  85                                 return usage_attribute;
  86                         }
  87                 }
  88
  89                 MethodImplOptions ImplOptions;
  90                 UnmanagedType     UnmanagedType;
  91                 CustomAttributeBuilder cb;
  92
  93                 // non-null if named args present after Resolve () is called
  94                 PropertyInfo [] prop_info_arr;
  95                 FieldInfo [] field_info_arr;
  96                 object [] field_values_arr;
  97                 object [] prop_values_arr;
  98                 object [] pos_values;
  99
 100                 static PtrHashtable usage_attr_cache = new PtrHashtable ();
 101
 102                 public Attribute (string target, string name, ArrayList args, Location loc)
 103                 {
 104                         Name = name;
 105                         Arguments = args;
 106                         Location = loc;
 107                         Target = target;
 108                 }
 109
 110                 void Error_InvalidNamedArgument (string name)
 111                 {
 112                         Report.Error (617, Location, "'" + name + "' is not a valid named attribute " +
 113                                       "argument. Named attribute arguments must be fields which are not " +
 114                                       "readonly, static or const, or properties with a set accessor which "+
 115                                       "are not static.");
 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                 static void Error_TypeParameterInAttribute (Location loc)
 126                 {
 127                         Report.Error (
 128                                 -202, loc, "Can not use a type parameter in an attribute");
 129                 }
 130
 131                 void Error_AttributeConstructorMismatch ()
 132                 {
 133                         Report.Error (-6, Location,
 134                                       "Could not find a constructor for this argument list.");
 135                 }
 136
 137                 /// <summary>
 138                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 139                 /// </summary>
 140                 protected virtual Type CheckAttributeType (EmitContext ec, bool complain)
 141                 {
 142                         TypeExpr t1 = RootContext.LookupType (ec.DeclSpace, Name, true, Location);
 143                         // FIXME: Shouldn't do this for quoted attributes: [@A]
 144                         TypeExpr t2 = RootContext.LookupType (ec.DeclSpace, Name + "Attribute", true, Location);
 145
 146                         String err0616 = null;
 147                         if (t1 != null && ! t1.IsAttribute) {
 148                                 t1 = null;
 149                                 err0616 = "'" + Name + "': is not an attribute class";
 150                         }
 151                         if (t2 != null && ! t2.IsAttribute) {
 152                                 t2 = null;
 153                                 err0616 = (err0616 != null)
 154                                         ? "Neither '" + Name + "' nor '" + Name + "Attribute' is an attribute class"
 155                                         : "'" + Name + "Attribute': is not an attribute class";
 156                         }
 157
 158                         if (t1 != null && t2 != null) {
 159                                 Report.Error(1614, Location, "'" + Name + "': is ambiguous; "
 160                                              + " use either '@" + Name + "' or '" + Name + "Attribute'");
 161                                 return null;
 162                         }
 163                         if (t1 != null)
 164                                 return t1.ResolveType (ec);
 165                         if (t2 != null)
 166                                 return t2.ResolveType (ec);
 167                         if (err0616 != null) {
 168                                 Report.Error (616, Location, err0616);
 169                                 return null;
 170                         }
 171
 172                         if (complain)
 173                                 Report.Error (246, Location,
 174                                               "Could not find attribute '" + Name
 175                                               + "' (are you missing a using directive or an assembly reference ?)");
 176                         return null;
 177                 }
 178
 179                 public Type ResolveType (EmitContext ec, bool complain)
 180                 {
 181                         if (Type == null)
 182                                 Type = CheckAttributeType (ec, complain);
 183                         return Type;
 184                 }
 185
 186                 /// <summary>
 187                 ///   Validates the guid string
 188                 /// </summary>
 189                 bool ValidateGuid (string guid)
 190                 {
 191                         try {
 192                                 new Guid (guid);
 193                                 return true;
 194                         } catch {
 195                                 Report.Error (647, Location, "Format of GUID is invalid: " + guid);
 196                                 return false;
 197                         }
 198                 }
 199
 200                 string GetFullMemberName (string member)
 201                 {
 202                         return Type.FullName + '.' + member;
 203                 }
 204
 205                 //
 206                 // Given an expression, if the expression is a valid attribute-argument-expression
 207                 // returns an object that can be used to encode it, or null on failure.
 208                 //
 209                 public static bool GetAttributeArgumentExpression (Expression e, Location loc, out object result)
 210                 {
 211                         if (e is Constant) {
 212                                 result = ((Constant) e).GetValue ();
 213                                 return true;
 214                         } else if (e is TypeOf) {
 215                                 result = ((TypeOf) e).TypeArg;
 216                                 return true;
 217                         } else if (e is ArrayCreation){
 218                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();
 219                                 if (result != null)
 220                                         return true;
 221                         } else if (e is EmptyCast) {
 222                                 result = e;
 223                                 if (((EmptyCast) e).Child is Constant) {
 224                                         result = ((Constant) ((EmptyCast)e).Child).GetValue();
 225                                 }
 226                                 return true;
 227                         }
 228
 229                         result = null;
 230                         Error_AttributeArgumentNotValid (loc);
 231                         return false;
 232                 }
 233
 234                 public CustomAttributeBuilder Resolve (EmitContext ec)
 235                 {
 236                         Type oldType = Type;
 237
 238                         // Sanity check.
 239                         Type = CheckAttributeType (ec, true);
 240                         if (oldType == null && Type == null)
 241                                 return null;
 242                         if (oldType != null && oldType != Type) {
 243                                 Report.Error (-6, Location,
 244                                               "Attribute {0} resolved to different types at different times: {1} vs. {2}",
 245                                               Name, oldType, Type);
 246                                 return null;
 247                         }
 248
 249                         bool MethodImplAttr = false;
 250                         bool MarshalAsAttr = false;
 251                         bool GuidAttr = false;
 252                         bool usage_attr = false;
 253
 254                         bool DoCompares = true;
 255
 256                         //
 257                         // If we are a certain special attribute, we
 258                         // set the information accordingly
 259                         //
 260
 261                         if (Type == TypeManager.attribute_usage_type)
 262                                 usage_attr = true;
 263                         else if (Type == TypeManager.methodimpl_attr_type)
 264                                 MethodImplAttr = true;
 265                         else if (Type == TypeManager.marshal_as_attr_type)
 266                                 MarshalAsAttr = true;
 267                         else if (Type == TypeManager.guid_attr_type)
 268                                 GuidAttr = true;
 269                         else
 270                                 DoCompares = false;
 271
 272                         // Now we extract the positional and named arguments
 273
 274                         ArrayList pos_args = new ArrayList ();
 275                         ArrayList named_args = new ArrayList ();
 276                         int pos_arg_count = 0;
 277
 278                         if (Arguments != null) {
 279                                 pos_args = (ArrayList) Arguments [0];
 280                                 if (pos_args != null)
 281                                         pos_arg_count = pos_args.Count;
 282                                 if (Arguments.Count > 1)
 283                                         named_args = (ArrayList) Arguments [1];
 284                         }
 285
 286                         pos_values = new object [pos_arg_count];
 287
 288                         //
 289                         // First process positional arguments
 290                         //
 291
 292                         int i;
 293                         for (i = 0; i < pos_arg_count; i++) {
 294                                 Argument a = (Argument) pos_args [i];
 295                                 Expression e;
 296
 297                                 if (!a.Resolve (ec, Location))
 298                                         return null;
 299
 300                                 e = a.Expr;
 301
 302                                 object val;
 303                                 if (!GetAttributeArgumentExpression (e, Location, out val))
 304                                         return null;
 305
 306                                 pos_values [i] = val;
 307                                 if (DoCompares){
 308                                         if (usage_attr)
 309                                                 usage_attribute = new AttributeUsageAttribute ((AttributeTargets) pos_values [0]);
 310                                         else if (MethodImplAttr)
 311                                                 this.ImplOptions = (MethodImplOptions) pos_values [0];
 312                                         else if (GuidAttr){
 313                                                 //
 314                                                 // we will later check the validity of the type
 315                                                 //
 316                                                 if (pos_values [0] is string){
 317                                                         if (!ValidateGuid ((string) pos_values [0]))
 318                                                                 return null;
 319                                                 }
 320
 321                                         } else if (MarshalAsAttr)
 322                                                 this.UnmanagedType =
 323                                                 (System.Runtime.InteropServices.UnmanagedType) pos_values [0];
 324                                 }
 325                         }
 326
 327                         //
 328                         // Now process named arguments
 329                         //
 330
 331                         ArrayList field_infos = null;
 332                         ArrayList prop_infos  = null;
 333                         ArrayList field_values = null;
 334                         ArrayList prop_values = null;
 335
 336                         if (named_args.Count > 0) {
 337                                 field_infos = new ArrayList ();
 338                                 prop_infos  = new ArrayList ();
 339                                 field_values = new ArrayList ();
 340                                 prop_values = new ArrayList ();
 341                         }
 342
 343                         Hashtable seen_names = new Hashtable();
 344
 345                         for (i = 0; i < named_args.Count; i++) {
 346                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 347                                 string member_name = (string) de.Key;
 348                                 Argument a  = (Argument) de.Value;
 349                                 Expression e;
 350
 351                                 if (seen_names.Contains(member_name)) {
 352                                         Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
 353                                         return null;
 354                                 }
 355                                 seen_names.Add(member_name, 1);
 356
 357                                 if (!a.Resolve (ec, Location))
 358                                         return null;
 359
 360                                 Expression member = Expression.MemberLookup (
 361                                         ec, Type, member_name,
 362                                         MemberTypes.Field | MemberTypes.Property,
 363                                         BindingFlags.Public | BindingFlags.Instance,
 364                                         Location);
 365
 366                                 if (member == null) {
 367                                         member = Expression.MemberLookup (ec, Type, member_name,
 368                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 369                                                 Location);
 370
 371                                         if (member != null) {
 372                                                 Report.Error_T (122, Location, GetFullMemberName (member_name));
 373                                                 return null;
 374                                         }
 375                                 }
 376
 377                                 if (member == null || !(member is PropertyExpr || member is FieldExpr)) {
 378                                         Error_InvalidNamedArgument (member_name);
 379                                         return null;
 380                                 }
 381
 382                                 e = a.Expr;
 383                                 if (e is TypeParameterExpr){
 384                                         Error_TypeParameterInAttribute (Location);
 385                                         return null;
 386                                 }
 387
 388                                 if (member is PropertyExpr) {
 389                                         PropertyExpr pe = (PropertyExpr) member;
 390                                         PropertyInfo pi = pe.PropertyInfo;
 391
 392                                         if (!pi.CanWrite) {
 393                                                 Error_InvalidNamedArgument (member_name);
 394                                                 return null;
 395                                         }
 396
 397                                         Constant c = e as Constant;
 398                                         if (c != null) {
 399                                                 if (c.Type != pi.PropertyType) {
 400                                                         c = Const.ChangeType (Location, c, pi.PropertyType);
 401                                                         if (c == null)
 402                                                                 return null;
 403                                                 }
 404
 405                                                 object o = c.GetValue ();
 406                                                 prop_values.Add (o);
 407
 408                                                 if (usage_attribute != null) {
 409                                                         if (member_name == "AllowMultiple")
 410                                                                 usage_attribute.AllowMultiple = (bool) o;
 411                                                         if (member_name == "Inherited")
 412                                                                 usage_attribute.Inherited = (bool) o;
 413                                                 }
 414
 415                                         } else if (e is TypeOf) {
 416                                                 prop_values.Add (((TypeOf) e).TypeArg);
 417                                         } else if (e is ArrayCreation) {
 418                                                 prop_values.Add (((ArrayCreation) e).EncodeAsAttribute());
 419                                         } else {
 420                                                 Error_AttributeArgumentNotValid (Location);
 421                                                 return null;
 422                                         }
 423
 424                                         prop_infos.Add (pi);
 425
 426                                 } else if (member is FieldExpr) {
 427                                         FieldExpr fe = (FieldExpr) member;
 428                                         FieldInfo fi = fe.FieldInfo;
 429
 430                                         if (fi.IsInitOnly) {
 431                                                 Error_InvalidNamedArgument (member_name);
 432                                                 return null;
 433                                         }
 434
 435                                         //
 436                                         // Handle charset here, and set the TypeAttributes
 437
 438                                         Constant c = e as Constant;
 439                                         if (c != null) {
 440                                                 if (c.Type != fi.FieldType){
 441                                                         c = Const.ChangeType (Location, c, fi.FieldType);
 442                                                         if (c == null)
 443                                                                 return null;
 444                                                 }
 445
 446                                                 object value = c.GetValue ();
 447                                                 field_values.Add (value);
 448                                         } else if (e is TypeOf) {
 449                                                 field_values.Add (((TypeOf) e).TypeArg);
 450                                         } else {
 451                                                 Error_AttributeArgumentNotValid (Location);
 452                                                 return null;
 453                                         }
 454
 455                                         field_infos.Add (fi);
 456                                 }
 457                         }
 458
 459                         Expression mg = Expression.MemberLookup (
 460                                 ec, Type, ".ctor", MemberTypes.Constructor,
 461                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 462                                 Location);
 463
 464                         if (mg == null) {
 465                                 Error_AttributeConstructorMismatch ();
 466                                 return null;
 467                         }
 468
 469                         MethodBase constructor = Invocation.OverloadResolve (
 470                                 ec, (MethodGroupExpr) mg, pos_args, false, Location);
 471
 472                         if (constructor == null) {
 473                                 Error_AttributeConstructorMismatch ();
 474                                 return null;
 475                         }
 476
 477                         //
 478                         // Now we perform some checks on the positional args as they
 479                         // cannot be null for a constructor which expects a parameter
 480                         // of type object
 481                         //
 482
 483                         ParameterData pd = Invocation.GetParameterData (constructor);
 484
 485                         int group_in_params_array = Int32.MaxValue;
 486                         int pc = pd.Count;
 487                         if (pc > 0 && pd.ParameterModifier (pc-1) == Parameter.Modifier.PARAMS)
 488                                 group_in_params_array = pc-1;
 489
 490                         for (int j = 0; j < pos_arg_count; ++j) {
 491                                 Argument a = (Argument) pos_args [j];
 492
 493                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {
 494                                         Error_AttributeArgumentNotValid (Location);
 495                                         return null;
 496                                 }
 497
 498                                 if (j < group_in_params_array)
 499                                         continue;
 500
 501                                 if (j == group_in_params_array){
 502                                         object v = pos_values [j];
 503                                         int count = pos_arg_count - j;
 504
 505                                         object [] array = new object [count];
 506                                         pos_values [j] = array;
 507                                         array [0] = v;
 508                                 } else {
 509                                         object [] array = (object []) pos_values [group_in_params_array];
 510
 511                                         array [j - group_in_params_array] = pos_values [j];
 512                                 }
 513                         }
 514
 515                         //
 516                         // Adjust the size of the pos_values if it had params
 517                         //
 518                         if (group_in_params_array != Int32.MaxValue){
 519                                 int argc = group_in_params_array+1;
 520                                 object [] new_pos_values = new object [argc];
 521
 522                                 for (int p = 0; p < argc; p++)
 523                                         new_pos_values [p] = pos_values [p];
 524                                 pos_values = new_pos_values;
 525                         }
 526
 527                         try {
 528                                 if (named_args.Count > 0) {
 529                                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 530                                         field_info_arr = new FieldInfo [field_infos.Count];
 531                                         field_values_arr = new object [field_values.Count];
 532                                         prop_values_arr = new object [prop_values.Count];
 533
 534                                         field_infos.CopyTo  (field_info_arr, 0);
 535                                         field_values.CopyTo (field_values_arr, 0);
 536
 537                                         prop_values.CopyTo  (prop_values_arr, 0);
 538                                         prop_infos.CopyTo   (prop_info_arr, 0);
 539
 540                                         cb = new CustomAttributeBuilder (
 541                                                 (ConstructorInfo) constructor, pos_values,
 542                                                 prop_info_arr, prop_values_arr,
 543                                                 field_info_arr, field_values_arr);
 544                                 }
 545                                 else
 546                                         cb = new CustomAttributeBuilder (
 547                                                 (ConstructorInfo) constructor, pos_values);
 548                         } catch (NullReferenceException) {
 549                                 //
 550                                 // Don't know what to do here
 551                                 //
 552                                 Report.Warning (
 553                                         -101, Location, "NullReferenceException while trying to create attribute." +
 554                                         "Something's wrong!");
 555                         } catch (Exception e) {
 556                                 //
 557                                 // Sample:
 558                                 // using System.ComponentModel;
 559                                 // [DefaultValue (CollectionChangeAction.Add)]
 560                                 // class X { static void Main () {} }
 561                                 //
 562                                 Report.Warning (
 563                                         -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);
 564                         }
 565
 566                         return cb;
 567                 }
 568
 569                 /// <summary>
 570                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 571                 /// </summary>
 572                 static string GetValidTargets (Attribute attr)
 573                 {
 574                         StringBuilder sb = new StringBuilder ();
 575                         AttributeTargets targets = attr.GetAttributeUsage ().ValidOn;
 576
 577                         if ((targets & AttributeTargets.Assembly) != 0)
 578                                 sb.Append ("'assembly' ");
 579
 580                         if ((targets & AttributeTargets.Class) != 0)
 581                                 sb.Append ("'class' ");
 582
 583                         if ((targets & AttributeTargets.Constructor) != 0)
 584                                 sb.Append ("'constructor' ");
 585
 586                         if ((targets & AttributeTargets.Delegate) != 0)
 587                                 sb.Append ("'delegate' ");
 588
 589                         if ((targets & AttributeTargets.Enum) != 0)
 590                                 sb.Append ("'enum' ");
 591
 592                         if ((targets & AttributeTargets.Event) != 0)
 593                                 sb.Append ("'event' ");
 594
 595                         if ((targets & AttributeTargets.Field) != 0)
 596                                 sb.Append ("'field' ");
 597
 598                         if ((targets & AttributeTargets.Interface) != 0)
 599                                 sb.Append ("'interface' ");
 600
 601                         if ((targets & AttributeTargets.Method) != 0)
 602                                 sb.Append ("'method' ");
 603
 604                         if ((targets & AttributeTargets.Module) != 0)
 605                                 sb.Append ("'module' ");
 606
 607                         if ((targets & AttributeTargets.Parameter) != 0)
 608                                 sb.Append ("'parameter' ");
 609
 610                         if ((targets & AttributeTargets.Property) != 0)
 611                                 sb.Append ("'property' ");
 612
 613                         if ((targets & AttributeTargets.ReturnValue) != 0)
 614                                 sb.Append ("'return' ");
 615
 616                         if ((targets & AttributeTargets.Struct) != 0)
 617                                 sb.Append ("'struct' ");
 618
 619                         return sb.ToString ();
 620
 621                 }
 622
 623                 public static void Error_AttributeNotValidForElement (Attribute a, Location loc)
 624                 {
 625                         Report.Error (
 626                                 592, loc, "Attribute '" + a.Name +
 627                                 "' is not valid on this declaration type. " +
 628                                 "It is valid on " + GetValidTargets (a) + "declarations only.");
 629                 }
 630
 631
 632                 /// <summary>
 633                 /// Returns AttributeUsage attribute for this type
 634                 /// </summary>
 635                 public AttributeUsageAttribute GetAttributeUsage ()
 636                 {
 637                         AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
 638                         if (ua != null)
 639                                 return ua;
 640
 641                         Class attr_class = TypeManager.LookupClass (Type);
 642
 643                         if (attr_class == null) {
 644                                 object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 645                                 ua = (AttributeUsageAttribute)usage_attr [0];
 646                                 usage_attr_cache.Add (Type, ua);
 647                                 return ua;
 648                         }
 649
 650                         return attr_class.AttributeUsage;
 651                 }
 652
 653
 654                 //
 655                 // This pulls the condition name out of a Conditional attribute
 656                 //
 657                 public string Conditional_GetConditionName ()
 658                 {
 659                         //
 660                         // So we have a Conditional, pull the data out.
 661                         //
 662                         if (Arguments == null || Arguments [0] == null){
 663                                 Error_AttributeConstructorMismatch ();
 664                                 return null;
 665                         }
 666
 667                         ArrayList pos_args = (ArrayList) Arguments [0];
 668                         if (pos_args.Count != 1){
 669                                 Error_AttributeConstructorMismatch ();
 670                                 return null;
 671                         }
 672
 673                         Argument arg = (Argument) pos_args [0];
 674                         if (!(arg.Expr is StringConstant)){
 675                                 Error_AttributeConstructorMismatch ();
 676                                 return null;
 677                         }
 678
 679                         return ((StringConstant) arg.Expr).Value;
 680                 }
 681
 682                 public string IndexerName_GetIndexerName (EmitContext ec)
 683                 {
 684                         if (Arguments == null || Arguments [0] == null){
 685                                 Error_AttributeConstructorMismatch ();
 686                                 return null;
 687                         }
 688                         ArrayList pos_args = (ArrayList) Arguments [0];
 689                         if (pos_args.Count != 1) {
 690                                 Error_AttributeConstructorMismatch ();
 691                                 return null;
 692                         }
 693
 694                         Argument arg = (Argument) pos_args [0];
 695                         if (!arg.Resolve (ec, Location))
 696                                 return null;
 697
 698                         StringConstant sc = arg.Expr as StringConstant;
 699                         if (sc == null){
 700                                 Error_AttributeConstructorMismatch ();
 701                                 return null;
 702                         }
 703
 704                         return sc.Value;
 705                 }
 706
 707                 /// <summary>
 708                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 709                 /// </summary>
 710                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 711                 {
 712                         if (pos_values == null) {
 713                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 714
 715                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 716                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 717                                 Resolve (ec);
 718                         }
 719
 720                         // Some error occurred
 721                         if (pos_values == null)
 722                                 return null;
 723
 724                         if (pos_values.Length == 0)
 725                                 return new ObsoleteAttribute ();
 726
 727                         if (pos_values.Length == 1)
 728                                 return new ObsoleteAttribute ((string)pos_values [0]);
 729
 730                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 731                 }
 732
 733                 /// <summary>
 734                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 735                 /// before ApplyAttribute. We need to resolve the arguments.
 736                 /// This situation occurs when class deps is differs from Emit order.
 737                 /// </summary>
 738                 public bool GetClsCompliantAttributeValue (DeclSpace ds)
 739                 {
 740                         if (pos_values == null) {
 741                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 742
 743                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 744                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 745                                 Resolve (ec);
 746                         }
 747
 748                         // Some error occurred
 749                         if (pos_values [0] == null)
 750                                 return false;
 751
 752                         return (bool)pos_values [0];
 753                 }
 754
 755                 public object GetPositionalValue (int i)
 756                 {
 757                         return (pos_values == null) ? null : pos_values[i];
 758                 }
 759
 760                 object GetFieldValue (string name)
 761                 {
 762                         int i;
 763                         if (field_info_arr == null)
 764                                 return null;
 765                         i = 0;
 766                         foreach (FieldInfo fi in field_info_arr) {
 767                                 if (fi.Name == name)
 768                                         return field_values_arr [i];
 769                                 i++;
 770                         }
 771                         return null;
 772                 }
 773
 774                 public UnmanagedMarshal GetMarshal ()
 775                 {
 776                         object o = GetFieldValue ("ArraySubType");
 777                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;
 778
 779                         switch (UnmanagedType) {
 780                         case UnmanagedType.CustomMarshaler:
 781                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
 782                                                                        BindingFlags.Static | BindingFlags.Public);
 783                                 if (define_custom == null)
 784                                         return null;
 785
 786                                 object [] args = new object [4];
 787                                 args [0] = GetFieldValue ("MarshalTypeRef");
 788                                 args [1] = GetFieldValue ("MarshalCookie");
 789                                 args [2] = GetFieldValue ("MarshalType");
 790                                 args [3] = Guid.Empty;
 791                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
 792
 793                         case UnmanagedType.LPArray:
 794                                 return UnmanagedMarshal.DefineLPArray (array_sub_type);
 795
 796                         case UnmanagedType.SafeArray:
 797                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
 798
 799                         case UnmanagedType.ByValArray:
 800                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
 801
 802                         case UnmanagedType.ByValTStr:
 803                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
 804
 805                         default:
 806                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
 807                         }
 808                 }
 809
 810                 public bool IsInternalCall
 811                 {
 812                         get { return ImplOptions == MethodImplOptions.InternalCall; }
 813                 }
 814
 815                 /// <summary>
 816                 /// Emit attribute for Attributable symbol
 817                 /// </summary>
 818                 public void Emit (EmitContext ec, Attributable ias, ListDictionary emitted_attr)
 819                 {
 820                         CustomAttributeBuilder cb = Resolve (ec);
 821                         if (cb == null)
 822                                 return;
 823
 824                         AttributeUsageAttribute usage_attr = GetAttributeUsage ();
 825                         if ((usage_attr.ValidOn & ias.AttributeTargets) == 0) {
 826                                         Error_AttributeNotValidForElement (this, Location);
 827                                 return;
 828                         }
 829
 830                         ias.ApplyAttributeBuilder (this, cb);
 831
 832                         if (!usage_attr.AllowMultiple && emitted_attr.Contains (Target)) {
 833                                 Report.Error (579, Location, "Duplicate '" + Name + "' attribute");
 834                         }
 835
 836                         emitted_attr [Type] = Target;
 837
 838                         // Here we are testing attribute arguments for array usage (error 3016)
 839                         if (ias.IsClsCompliaceRequired (ec.DeclSpace)) {
 840                                 if (Arguments == null)
 841                                         return;
 842
 843                                 ArrayList pos_args = (ArrayList) Arguments [0];
 844                                 if (pos_args != null) {
 845                                         foreach (Argument arg in pos_args) {
 846                                                 // Type is undefined (was error 246)
 847                                                 if (arg.Type == null)
 848                                                         return;
 849
 850                                                 if (arg.Type.IsArray) {
 851                                                         Report.Error_T (3016, Location);
 852                                                         return;
 853                                                 }
 854                                         }
 855                                 }
 856
 857                                 if (Arguments.Count < 2)
 858                                         return;
 859
 860                                 ArrayList named_args = (ArrayList) Arguments [1];
 861                                 foreach (DictionaryEntry de in named_args) {
 862                                         Argument arg  = (Argument) de.Value;
 863
 864                                         // Type is undefined (was error 246)
 865                                         if (arg.Type == null)
 866                                                 return;
 867
 868                                         if (arg.Type.IsArray) {
 869                                                 Report.Error_T (3016, Location);
 870                                                 return;
 871                                         }
 872                                 }
 873                         }
 874                 }
 875
 876                 public object GetValue (EmitContext ec, Constant c, Type target)
 877                 {
 878                         if (Convert.ImplicitConversionExists (ec, c, target))
 879                                 return c.GetValue ();
 880
 881                         Convert.Error_CannotImplicitConversion (Location, c.Type, target);
 882                         return null;
 883                 }
 884
 885                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,
 886                                                           MethodAttributes flags, Type ret_type, Type [] param_types)
 887                 {
 888                         //
 889                         // We extract from the attribute the information we need
 890                         //
 891
 892                         if (Arguments == null) {
 893                                 Console.WriteLine ("Internal error : this is not supposed to happen !");
 894                                 return null;
 895                         }
 896
 897                         ResolveType (ec, true);
 898                         if (Type == null)
 899                                 return null;
 900
 901                         ArrayList named_args = new ArrayList ();
 902
 903                         ArrayList pos_args = (ArrayList) Arguments [0];
 904                         if (Arguments.Count > 1)
 905                                 named_args = (ArrayList) Arguments [1];
 906
 907
 908                         string dll_name = null;
 909
 910                         Argument tmp = (Argument) pos_args [0];
 911
 912                         if (!tmp.Resolve (ec, Location))
 913                                 return null;
 914
 915                         if (tmp.Expr is Constant)
 916                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();
 917                         else {
 918                                 Error_AttributeArgumentNotValid (Location);
 919                                 return null;
 920                         }
 921
 922                         // Now we process the named arguments
 923                         CallingConvention cc = CallingConvention.Winapi;
 924                         CharSet charset = CharSet.Ansi;
 925                         bool preserve_sig = true;
 926 #if FIXME
 927                         bool exact_spelling = false;
 928 #endif
 929                         bool set_last_err = false;
 930                         string entry_point = null;
 931
 932                         for (int i = 0; i < named_args.Count; i++) {
 933
 934                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 935
 936                                 string member_name = (string) de.Key;
 937                                 Argument a  = (Argument) de.Value;
 938
 939                                 if (!a.Resolve (ec, Location))
 940                                         return null;
 941
 942                                 Expression member = Expression.MemberLookup (
 943                                         ec, Type, member_name,
 944                                         MemberTypes.Field | MemberTypes.Property,
 945                                         BindingFlags.Public | BindingFlags.Instance,
 946                                         Location);
 947
 948                                 if (member == null || !(member is FieldExpr)) {
 949                                         Error_InvalidNamedArgument (member_name);
 950                                         return null;
 951                                 }
 952
 953                                 if (member is FieldExpr) {
 954                                         FieldExpr fe = (FieldExpr) member;
 955                                         FieldInfo fi = fe.FieldInfo;
 956
 957                                         if (fi.IsInitOnly) {
 958                                                 Error_InvalidNamedArgument (member_name);
 959                                                 return null;
 960                                         }
 961
 962                                         if (a.Expr is Constant) {
 963                                                 Constant c = (Constant) a.Expr;
 964
 965                                                 try {
 966                                                         if (member_name == "CallingConvention"){
 967                                                                 object val = GetValue (ec, c, typeof (CallingConvention));
 968                                                                 if (val == null)
 969                                                                         return null;
 970                                                                 cc = (CallingConvention) val;
 971                                                         } else if (member_name == "CharSet"){
 972                                                                 charset = (CharSet) c.GetValue ();
 973                                                         } else if (member_name == "EntryPoint")
 974                                                                 entry_point = (string) c.GetValue ();
 975                                                         else if (member_name == "SetLastError")
 976                                                                 set_last_err = (bool) c.GetValue ();
 977 #if FIXME
 978                                                         else if (member_name == "ExactSpelling")
 979                                                                 exact_spelling = (bool) c.GetValue ();
 980 #endif
 981                                                         else if (member_name == "PreserveSig")
 982                                                                 preserve_sig = (bool) c.GetValue ();
 983                                                 } catch (InvalidCastException){
 984                                                         Error_InvalidNamedArgument (member_name);
 985                                                         Error_AttributeArgumentNotValid (Location);
 986                                                 }
 987                                         } else {
 988                                                 Error_AttributeArgumentNotValid (Location);
 989                                                 return null;
 990                                         }
 991
 992                                 }
 993                         }
 994
 995                         if (entry_point == null)
 996                                 entry_point = name;
 997                         if (set_last_err)
 998                                 charset = (CharSet)((int)charset | 0x40);
 999
1000                         MethodBuilder mb = builder.DefinePInvokeMethod (
1001                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,
1002                                 CallingConventions.Standard,
1003                                 ret_type,
1004                                 param_types,
1005                                 cc,
1006                                 charset);
1007
1008                         if (preserve_sig)
1009                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);
1010
1011                         return mb;
1012                 }
1013
1014                 private Expression GetValue ()
1015                 {
1016                         if ((Arguments == null) || (Arguments.Count < 1))
1017                                 return null;
1018                         ArrayList al = (ArrayList) Arguments [0];
1019                         if ((al == null) || (al.Count < 1))
1020                                 return null;
1021                         Argument arg = (Argument) al [0];
1022                         if ((arg == null) || (arg.Expr == null))
1023                                 return null;
1024                         return arg.Expr;
1025                 }
1026
1027                 public string GetString ()
1028                 {
1029                         Expression e = GetValue ();
1030                         if (e is StringLiteral)
1031                                 return (e as StringLiteral).Value;
1032                         return null;
1033                 }
1034
1035                 public bool GetBoolean ()
1036                 {
1037                         Expression e = GetValue ();
1038                         if (e is BoolLiteral)
1039                                 return (e as BoolLiteral).Value;
1040                         return false;
1041                 }
1042         }
1043
1044
1045         /// <summary>
1046         /// For global attributes (assembly, module) we need special handling.
1047         /// Attributes can be located in the several files
1048         /// </summary>
1049         public class GlobalAttribute: Attribute
1050         {
1051                 public readonly NamespaceEntry ns;
1052
1053                 public GlobalAttribute (TypeContainer container, string target, string name, ArrayList args, Location loc):
1054                         base (target, name, args, loc)
1055                 {
1056                         ns = container.NamespaceEntry;
1057                 }
1058
1059                 protected override Type CheckAttributeType (EmitContext ec, bool complain)
1060                 {
1061                         NamespaceEntry old = ec.DeclSpace.NamespaceEntry;
1062                         if (old == null || old.NS == null || old.NS == Namespace.Root)
1063                                 ec.DeclSpace.NamespaceEntry = ns;
1064                         return base.CheckAttributeType (ec, complain);
1065                 }
1066         }
1067
1068         public class Attributes {
1069                 public ArrayList Attrs;
1070
1071                 public Attributes (Attribute a)
1072                 {
1073                         Attrs = new ArrayList ();
1074                         Attrs.Add (a);
1075                 }
1076
1077                 public Attributes (ArrayList attrs)
1078                 {
1079                         Attrs = attrs;
1080                 }
1081
1082                 public void AddAttributes (ArrayList attrs)
1083                 {
1084                         Attrs.AddRange (attrs);
1085                 }
1086
1087                 /// <summary>
1088                 /// Checks whether attribute target is valid for the current element
1089                 /// </summary>
1090                 public void CheckTargets (string[] possible_targets)
1091                 {
1092                         foreach (Attribute a in Attrs) {
1093                                 if (a.Target == null) {
1094                                         a.Target = possible_targets [0];
1095                                         continue;
1096                                 }
1097
1098                                 if (((IList) possible_targets).Contains (a.Target))
1099                                         continue;
1100
1101                                 StringBuilder sb = new StringBuilder ();
1102                                 foreach (string s in possible_targets) {
1103                                         sb.Append (s);
1104                                         sb.Append (", ");
1105                                 }
1106                                 sb.Remove (sb.Length - 2, 2);
1107                                 Report.Error_T (657, a.Location, a.Target, sb.ToString ());
1108                         }
1109                 }
1110
1111                 private Attribute Search (Type t, EmitContext ec, bool complain)
1112                 {
1113                         foreach (Attribute a in Attrs) {
1114                                 if (a.ResolveType (ec, false) == t)
1115                                         return a;
1116                         }
1117                         return null;
1118                 }
1119
1120                 public Attribute Search (Type t, EmitContext ec)
1121                 {
1122                         return Search (t, ec, true);
1123                 }
1124
1125                 public void Emit (EmitContext ec, Attributable ias)
1126                 {
1127                         ListDictionary ld = new ListDictionary ();
1128
1129                         foreach (Attribute a in Attrs)
1130                                 a.Emit (ec, ias, ld);
1131                 }
1132
1133                 public bool Contains (Type t, EmitContext ec)
1134                 {
1135                         return Search (t, ec) != null;
1136                 }
1137
1138                 public Attribute GetClsCompliantAttribute (EmitContext ec)
1139                 {
1140                         return Search (TypeManager.cls_compliant_attribute_type, ec, false);
1141                 }
1142
1143                 /// <summary>
1144                 /// Pulls the IndexerName attribute from an Indexer if it exists.
1145                 /// </summary>
1146                 public string ScanForIndexerName (EmitContext ec)
1147                 {
1148                         Attribute a = Search (TypeManager.indexer_name_type, ec);
1149                         if (a == null)
1150                                 return null;
1151
1152                         // Remove the attribute from the list
1153                         //TODO: It is very close to hack and it can crash here
1154                         Attrs.Remove (a);
1155
1156                         return a.IndexerName_GetIndexerName (ec);
1157                 }
1158
1159         }
1160
1161         /// <summary>
1162         /// Helper class for attribute verification routine.
1163         /// </summary>
1164         sealed class AttributeTester
1165         {
1166                 static PtrHashtable analyzed_types = new PtrHashtable ();
1167                 static PtrHashtable analyzed_member_obsolete = new PtrHashtable ();
1168
1169                 private AttributeTester ()
1170                 {
1171                 }
1172
1173                 /// <summary>
1174                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1175                 /// It tests differing only in ref or out, or in array rank.
1176                 /// </summary>
1177                 public static bool AreOverloadedMethodParamsClsCompliant (Type[] types_a, Type[] types_b)
1178                 {
1179                         if (types_a == null || types_b == null)
1180                                 return true;
1181
1182                         if (types_a.Length != types_b.Length)
1183                                 return true;
1184
1185                         for (int i = 0; i < types_b.Length; ++i) {
1186                                 Type aType = types_a [i];
1187                                 Type bType = types_b [i];
1188
1189                                 if (aType.IsArray && bType.IsArray && aType.GetArrayRank () != bType.GetArrayRank () && aType.GetElementType () == bType.GetElementType ()) {
1190                                         return false;
1191                                 }
1192
1193                                 Type aBaseType = aType;
1194                                 bool is_either_ref_or_out = false;
1195
1196                                 if (aType.IsByRef || aType.IsPointer) {
1197                                         aBaseType = aType.GetElementType ();
1198                                         is_either_ref_or_out = true;
1199                                 }
1200
1201                                 Type bBaseType = bType;
1202                                 if (bType.IsByRef || bType.IsPointer)
1203                                 {
1204                                         bBaseType = bType.GetElementType ();
1205                                         is_either_ref_or_out = !is_either_ref_or_out;
1206                                 }
1207
1208                                 if (aBaseType != bBaseType)
1209                                         continue;
1210
1211                                 if (is_either_ref_or_out)
1212                                         return false;
1213                         }
1214                         return true;
1215                 }
1216
1217                 /// <summary>
1218                 /// Goes through all parameters and test if they are CLS-Compliant.
1219                 /// </summary>
1220                 public static bool AreParametersCompliant (Parameter[] fixedParameters, Location loc)
1221                 {
1222                         if (fixedParameters == null)
1223                                 return true;
1224
1225                         foreach (Parameter arg in fixedParameters) {
1226                                 if (!AttributeTester.IsClsCompliant (arg.ParameterType)) {
1227                                         Report.Error_T (3001, loc, arg.GetSignatureForError ());
1228                                         return false;
1229                                 }
1230                         }
1231                         return true;
1232                 }
1233
1234
1235                 /// <summary>
1236                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1237                 /// </summary>
1238                 public static bool IsClsCompliant (Type type)
1239                 {
1240                         if (type == null)
1241                                 return true;
1242
1243                         object type_compliance = analyzed_types[type];
1244                         if (type_compliance != null)
1245                                 return type_compliance == TRUE;
1246
1247                         if (type.IsPointer) {
1248                                 analyzed_types.Add (type, null);
1249                                 return false;
1250                         }
1251
1252                         bool result;
1253                         if (type.IsArray || type.IsByRef)       {
1254                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1255                         } else {
1256                                 result = AnalyzeTypeCompliance (type);
1257                         }
1258                         analyzed_types.Add (type, result ? TRUE : FALSE);
1259                         return result;
1260                 }
1261
1262                 static object TRUE = new object ();
1263                 static object FALSE = new object ();
1264
1265                 /// <summary>
1266                 /// Non-hierarchical CLS Compliance analyzer
1267                 /// </summary>
1268                 public static bool IsComplianceRequired (MemberInfo mi, DeclSpace ds)
1269                 {
1270                         DeclSpace temp_ds = TypeManager.LookupDeclSpace (mi.DeclaringType);
1271
1272                         // Type is external, we can get attribute directly
1273                         if (temp_ds == null) {
1274                                 object[] cls_attribute = mi.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1275                                 return (cls_attribute.Length == 1 && ((CLSCompliantAttribute)cls_attribute[0]).IsCompliant);
1276                         }
1277
1278                         string tmp_name;
1279                         // Interface doesn't store full name
1280                         if (temp_ds is Interface)
1281                                 tmp_name = mi.Name;
1282                         else
1283                                 tmp_name = String.Concat (temp_ds.Name, ".", mi.Name);
1284
1285                         MemberCore mc = temp_ds.GetDefinition (tmp_name) as MemberCore;
1286                         return mc.IsClsCompliaceRequired (ds);
1287                 }
1288
1289                 public static void VerifyModulesClsCompliance ()
1290                 {
1291                         Module[] modules = TypeManager.Modules;
1292                         if (modules == null)
1293                                 return;
1294
1295                         // The first module is generated assembly
1296                         for (int i = 1; i < modules.Length; ++i) {
1297                                 Module module = modules [i];
1298                                 if (!IsClsCompliant (module)) {
1299                                         Report.Error_T (3013, module.Name);
1300                                         return;
1301                                 }
1302                         }
1303                 }
1304
1305                 static bool IsClsCompliant (ICustomAttributeProvider attribute_provider)
1306                 {
1307                         object[] CompliantAttribute = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1308                         if (CompliantAttribute.Length == 0)
1309                                 return false;
1310
1311                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1312                 }
1313
1314                 static bool AnalyzeTypeCompliance (Type type)
1315                 {
1316                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1317                         if (ds != null) {
1318                                 return ds.IsClsCompliaceRequired (ds.Parent);
1319                         }
1320
1321                         if (type.IsGenericParameter)
1322                                 return false;
1323
1324                         object[] CompliantAttribute = type.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1325                         if (CompliantAttribute.Length == 0)
1326                                 return IsClsCompliant (type.Assembly);
1327
1328                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1329                 }
1330
1331                 /// <summary>
1332                 /// Returns instance of ObsoleteAttribute when method is obsolete
1333                 /// </summary>
1334                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1335                 {
1336                         IMethodData mc = TypeManager.GetMethod (mb);
1337                         if (mc != null)
1338                                 return mc.GetObsoleteAttribute ();
1339
1340                         // TODO: remove after Constructor will be ready for IMethodData
1341                         if (mb.DeclaringType is TypeBuilder)
1342                                 return null;
1343
1344                         return GetMemberObsoleteAttribute (mb);
1345                 }
1346
1347                 /// <summary>
1348                 /// Returns instance of ObsoleteAttribute when member is obsolete
1349                 /// </summary>
1350                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1351                 {
1352                         object type_obsolete = analyzed_member_obsolete [mi];
1353                         if (type_obsolete == FALSE)
1354                                 return null;
1355
1356                         if (type_obsolete != null)
1357                                 return (ObsoleteAttribute)type_obsolete;
1358
1359                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false) as ObsoleteAttribute;
1360                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1361                         return oa;
1362                 }
1363
1364                 /// <summary>
1365                 /// Common method for Obsolete error/warning reporting.
1366                 /// </summary>
1367                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1368                 {
1369                         if (oa.IsError) {
1370                                 Report.Error_T (619, loc, member, oa.Message);
1371                                 return;
1372                         }
1373
1374                         if (oa.Message == null) {
1375                                 Report.Warning_T (612, loc, member);
1376                                 return;
1377                         }
1378                         Report.Warning_T (618, loc, member, oa.Message);
1379                 }
1380         }
1381 }