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