mcs/gmcs/attribute.cs

   1 //
   2 // attribute.cs: Attribute Handler
   3 //
   4 // Author: Ravi Pratap (ravi@ximian.com)
   5 //         Marek Safar (marek.safar@seznam.cz)
   6 //
   7 // Licensed under the terms of the GNU GPL
   8 //
   9 // (C) 2001 Ximian, Inc (http://www.ximian.com)
  10 //
  11 //
  12
  13 using System;
  14 using System.Diagnostics;
  15 using System.Collections;
  16 using System.Collections.Specialized;
  17 using System.Reflection;
  18 using System.Reflection.Emit;
  19 using System.Runtime.InteropServices;
  20 using System.Runtime.CompilerServices;
  21 using System.Text;
  22
  23 namespace Mono.CSharp {
  24
  25         /// <summary>
  26         ///   Base class for objects that can have Attributes applied to them.
  27         /// </summary>
  28         public abstract class Attributable {
  29                 /// <summary>
  30                 ///   Attributes for this type
  31                 /// </summary>
  32                 Attributes attributes;
  33
  34                 public Attributable(Attributes attrs)
  35                 {
  36                         attributes = attrs;
  37                         if (attributes != null)
  38                                 attributes.CheckTargets (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                 static void Error_TypeParameterInAttribute (Location loc)
 127                 {
 128                         Report.Error (
 129                                 -202, loc, "Can not use a type parameter in an attribute");
 130                 }
 131
 132                 void Error_AttributeConstructorMismatch ()
 133                 {
 134                         Report.Error (-6, Location,
 135                                       "Could not find a constructor for this argument list.");
 136                 }
 137
 138                 /// <summary>
 139                 ///   Tries to resolve the type of the attribute. Flags an error if it can't, and complain is true.
 140                 /// </summary>
 141                 protected virtual Type CheckAttributeType (EmitContext ec, bool complain)
 142                 {
 143                         TypeExpr t1 = RootContext.LookupType (ec.DeclSpace, Name, true, Location);
 144                         // FIXME: Shouldn't do this for quoted attributes: [@A]
 145                         TypeExpr t2 = RootContext.LookupType (ec.DeclSpace, Name + "Attribute", true, Location);
 146
 147                         String err0616 = null;
 148                         if (t1 != null && ! t1.IsAttribute) {
 149                                 t1 = null;
 150                                 err0616 = "'" + Name + "': is not an attribute class";
 151                         }
 152                         if (t2 != null && ! t2.IsAttribute) {
 153                                 t2 = null;
 154                                 err0616 = (err0616 != null)
 155                                         ? "Neither '" + Name + "' nor '" + Name + "Attribute' is an attribute class"
 156                                         : "'" + Name + "Attribute': is not an attribute class";
 157                         }
 158
 159                         if (t1 != null && t2 != null) {
 160                                 Report.Error(1614, Location, "'" + Name + "': is ambiguous; "
 161                                              + " use either '@" + Name + "' or '" + Name + "Attribute'");
 162                                 return null;
 163                         }
 164                         if (t1 != null)
 165                                 return t1.ResolveType (ec);
 166                         if (t2 != null)
 167                                 return t2.ResolveType (ec);
 168                         if (err0616 != null) {
 169                                 Report.Error (616, Location, err0616);
 170                                 return null;
 171                         }
 172
 173                         if (complain)
 174                                 Report.Error (246, Location,
 175                                               "Could not find attribute '" + Name
 176                                               + "' (are you missing a using directive or an assembly reference ?)");
 177                         return null;
 178                 }
 179
 180                 public Type ResolveType (EmitContext ec, bool complain)
 181                 {
 182                         if (Type == null)
 183                                 Type = CheckAttributeType (ec, complain);
 184                         return Type;
 185                 }
 186
 187                 /// <summary>
 188                 ///   Validates the guid string
 189                 /// </summary>
 190                 bool ValidateGuid (string guid)
 191                 {
 192                         try {
 193                                 new Guid (guid);
 194                                 return true;
 195                         } catch {
 196                                 Report.Error (647, Location, "Format of GUID is invalid: " + guid);
 197                                 return false;
 198                         }
 199                 }
 200
 201                 string GetFullMemberName (string member)
 202                 {
 203                         return Type.FullName + '.' + member;
 204                 }
 205
 206                 //
 207                 // Given an expression, if the expression is a valid attribute-argument-expression
 208                 // returns an object that can be used to encode it, or null on failure.
 209                 //
 210                 public static bool GetAttributeArgumentExpression (Expression e, Location loc, out object result)
 211                 {
 212                         if (e is Constant) {
 213                                 result = ((Constant) e).GetValue ();
 214                                 return true;
 215                         } else if (e is TypeOf) {
 216                                 result = ((TypeOf) e).TypeArg;
 217                                 return true;
 218                         } else if (e is ArrayCreation){
 219                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();
 220                                 if (result != null)
 221                                         return true;
 222                         } else if (e is EmptyCast) {
 223                                 result = e;
 224                                 if (((EmptyCast) e).Child is Constant) {
 225                                         result = ((Constant) ((EmptyCast)e).Child).GetValue();
 226                                 }
 227                                 return true;
 228                         }
 229
 230                         result = null;
 231                         Error_AttributeArgumentNotValid (loc);
 232                         return false;
 233                 }
 234
 235                 public CustomAttributeBuilder Resolve (EmitContext ec)
 236                 {
 237                         Type oldType = Type;
 238
 239                         // Sanity check.
 240                         Type = CheckAttributeType (ec, true);
 241                         if (oldType == null && Type == null)
 242                                 return null;
 243                         if (oldType != null && oldType != Type) {
 244                                 Report.Error (-6, Location,
 245                                               "Attribute {0} resolved to different types at different times: {1} vs. {2}",
 246                                               Name, oldType, Type);
 247                                 return null;
 248                         }
 249
 250                         bool MethodImplAttr = false;
 251                         bool MarshalAsAttr = false;
 252                         bool GuidAttr = false;
 253                         bool usage_attr = false;
 254
 255                         bool DoCompares = true;
 256
 257                         //
 258                         // If we are a certain special attribute, we
 259                         // set the information accordingly
 260                         //
 261
 262                         if (Type == TypeManager.attribute_usage_type)
 263                                 usage_attr = true;
 264                         else if (Type == TypeManager.methodimpl_attr_type)
 265                                 MethodImplAttr = true;
 266                         else if (Type == TypeManager.marshal_as_attr_type)
 267                                 MarshalAsAttr = true;
 268                         else if (Type == TypeManager.guid_attr_type)
 269                                 GuidAttr = true;
 270                         else
 271                                 DoCompares = false;
 272
 273                         // Now we extract the positional and named arguments
 274
 275                         ArrayList pos_args = new ArrayList ();
 276                         ArrayList named_args = new ArrayList ();
 277                         int pos_arg_count = 0;
 278
 279                         if (Arguments != null) {
 280                                 pos_args = (ArrayList) Arguments [0];
 281                                 if (pos_args != null)
 282                                         pos_arg_count = pos_args.Count;
 283                                 if (Arguments.Count > 1)
 284                                         named_args = (ArrayList) Arguments [1];
 285                         }
 286
 287                         pos_values = new object [pos_arg_count];
 288
 289                         //
 290                         // First process positional arguments
 291                         //
 292
 293                         int i;
 294                         for (i = 0; i < pos_arg_count; i++) {
 295                                 Argument a = (Argument) pos_args [i];
 296                                 Expression e;
 297
 298                                 if (!a.Resolve (ec, Location))
 299                                         return null;
 300
 301                                 e = a.Expr;
 302
 303                                 object val;
 304                                 if (!GetAttributeArgumentExpression (e, Location, out val))
 305                                         return null;
 306
 307                                 pos_values [i] = val;
 308                                 if (DoCompares){
 309                                         if (usage_attr)
 310                                                 usage_attribute = new AttributeUsageAttribute ((AttributeTargets) pos_values [0]);
 311                                         else if (MethodImplAttr)
 312                                                 this.ImplOptions = (MethodImplOptions) pos_values [0];
 313                                         else if (GuidAttr){
 314                                                 //
 315                                                 // we will later check the validity of the type
 316                                                 //
 317                                                 if (pos_values [0] is string){
 318                                                         if (!ValidateGuid ((string) pos_values [0]))
 319                                                                 return null;
 320                                                 }
 321
 322                                         } else if (MarshalAsAttr)
 323                                                 this.UnmanagedType =
 324                                                 (System.Runtime.InteropServices.UnmanagedType) pos_values [0];
 325                                 }
 326                         }
 327
 328                         //
 329                         // Now process named arguments
 330                         //
 331
 332                         ArrayList field_infos = null;
 333                         ArrayList prop_infos  = null;
 334                         ArrayList field_values = null;
 335                         ArrayList prop_values = null;
 336
 337                         if (named_args.Count > 0) {
 338                                 field_infos = new ArrayList ();
 339                                 prop_infos  = new ArrayList ();
 340                                 field_values = new ArrayList ();
 341                                 prop_values = new ArrayList ();
 342                         }
 343
 344                         Hashtable seen_names = new Hashtable();
 345
 346                         for (i = 0; i < named_args.Count; i++) {
 347                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 348                                 string member_name = (string) de.Key;
 349                                 Argument a  = (Argument) de.Value;
 350                                 Expression e;
 351
 352                                 if (seen_names.Contains(member_name)) {
 353                                         Report.Error(643, Location, "'" + member_name + "' duplicate named attribute argument");
 354                                         return null;
 355                                 }
 356                                 seen_names.Add(member_name, 1);
 357
 358                                 if (!a.Resolve (ec, Location))
 359                                         return null;
 360
 361                                 Expression member = Expression.MemberLookup (
 362                                         ec, Type, member_name,
 363                                         MemberTypes.Field | MemberTypes.Property,
 364                                         BindingFlags.Public | BindingFlags.Instance,
 365                                         Location);
 366
 367                                 if (member == null) {
 368                                         member = Expression.MemberLookup (ec, Type, member_name,
 369                                                 MemberTypes.Field | MemberTypes.Property, BindingFlags.NonPublic | BindingFlags.Instance,
 370                                                 Location);
 371
 372                                         if (member != null) {
 373                                                 Report.Error_T (122, Location, GetFullMemberName (member_name));
 374                                                 return null;
 375                                         }
 376                                 }
 377
 378                                 if (member == null || !(member is PropertyExpr || member is FieldExpr)) {
 379                                         Error_InvalidNamedArgument (member_name);
 380                                         return null;
 381                                 }
 382
 383                                 e = a.Expr;
 384                                 if (e is TypeParameterExpr){
 385                                         Error_TypeParameterInAttribute (Location);
 386                                         return null;
 387                                 }
 388
 389                                 if (member is PropertyExpr) {
 390                                         PropertyExpr pe = (PropertyExpr) member;
 391                                         PropertyInfo pi = pe.PropertyInfo;
 392
 393                                         if (!pi.CanWrite) {
 394                                                 Error_InvalidNamedArgument (member_name);
 395                                                 return null;
 396                                         }
 397
 398                                         Constant c = e as Constant;
 399                                         if (c != null) {
 400                                                 if (c.Type != pi.PropertyType) {
 401                                                         c = Const.ChangeType (Location, c, pi.PropertyType);
 402                                                         if (c == null)
 403                                                                 return null;
 404                                                 }
 405
 406                                                 object o = c.GetValue ();
 407                                                 prop_values.Add (o);
 408
 409                                                 if (usage_attribute != null) {
 410                                                         if (member_name == "AllowMultiple")
 411                                                                 usage_attribute.AllowMultiple = (bool) o;
 412                                                         if (member_name == "Inherited")
 413                                                                 usage_attribute.Inherited = (bool) o;
 414                                                 }
 415
 416                                         } else if (e is TypeOf) {
 417                                                 prop_values.Add (((TypeOf) e).TypeArg);
 418                                         } else if (e is ArrayCreation) {
 419                                                 prop_values.Add (((ArrayCreation) e).EncodeAsAttribute());
 420                                         } else {
 421                                                 Error_AttributeArgumentNotValid (Location);
 422                                                 return null;
 423                                         }
 424
 425                                         prop_infos.Add (pi);
 426
 427                                 } else if (member is FieldExpr) {
 428                                         FieldExpr fe = (FieldExpr) member;
 429                                         FieldInfo fi = fe.FieldInfo;
 430
 431                                         if (fi.IsInitOnly) {
 432                                                 Error_InvalidNamedArgument (member_name);
 433                                                 return null;
 434                                         }
 435
 436                                         //
 437                                         // Handle charset here, and set the TypeAttributes
 438
 439                                         Constant c = e as Constant;
 440                                         if (c != null) {
 441                                                 if (c.Type != fi.FieldType){
 442                                                         c = Const.ChangeType (Location, c, fi.FieldType);
 443                                                         if (c == null)
 444                                                                 return null;
 445                                                 }
 446
 447                                                 object value = c.GetValue ();
 448                                                 field_values.Add (value);
 449                                         } else if (e is TypeOf) {
 450                                                 field_values.Add (((TypeOf) e).TypeArg);
 451                                         } else {
 452                                                 Error_AttributeArgumentNotValid (Location);
 453                                                 return null;
 454                                         }
 455
 456                                         field_infos.Add (fi);
 457                                 }
 458                         }
 459
 460                         Expression mg = Expression.MemberLookup (
 461                                 ec, Type, ".ctor", MemberTypes.Constructor,
 462                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,
 463                                 Location);
 464
 465                         if (mg == null) {
 466                                 Error_AttributeConstructorMismatch ();
 467                                 return null;
 468                         }
 469
 470                         MethodBase constructor = Invocation.OverloadResolve (
 471                                 ec, (MethodGroupExpr) mg, pos_args, false, Location);
 472
 473                         if (constructor == null) {
 474                                 Error_AttributeConstructorMismatch ();
 475                                 return null;
 476                         }
 477
 478                         //
 479                         // Now we perform some checks on the positional args as they
 480                         // cannot be null for a constructor which expects a parameter
 481                         // of type object
 482                         //
 483
 484                         ParameterData pd = Invocation.GetParameterData (constructor);
 485
 486                         int group_in_params_array = Int32.MaxValue;
 487                         int pc = pd.Count;
 488                         if (pc > 0 && pd.ParameterModifier (pc-1) == Parameter.Modifier.PARAMS)
 489                                 group_in_params_array = pc-1;
 490
 491                         for (int j = 0; j < pos_arg_count; ++j) {
 492                                 Argument a = (Argument) pos_args [j];
 493
 494                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {
 495                                         Error_AttributeArgumentNotValid (Location);
 496                                         return null;
 497                                 }
 498
 499                                 if (j < group_in_params_array)
 500                                         continue;
 501
 502                                 if (j == group_in_params_array){
 503                                         object v = pos_values [j];
 504                                         int count = pos_arg_count - j;
 505
 506                                         object [] array = new object [count];
 507                                         pos_values [j] = array;
 508                                         array [0] = v;
 509                                 } else {
 510                                         object [] array = (object []) pos_values [group_in_params_array];
 511
 512                                         array [j - group_in_params_array] = pos_values [j];
 513                                 }
 514                         }
 515
 516                         //
 517                         // Adjust the size of the pos_values if it had params
 518                         //
 519                         if (group_in_params_array != Int32.MaxValue){
 520                                 int argc = group_in_params_array+1;
 521                                 object [] new_pos_values = new object [argc];
 522
 523                                 for (int p = 0; p < argc; p++)
 524                                         new_pos_values [p] = pos_values [p];
 525                                 pos_values = new_pos_values;
 526                         }
 527
 528                         try {
 529                                 if (named_args.Count > 0) {
 530                                         prop_info_arr = new PropertyInfo [prop_infos.Count];
 531                                         field_info_arr = new FieldInfo [field_infos.Count];
 532                                         field_values_arr = new object [field_values.Count];
 533                                         prop_values_arr = new object [prop_values.Count];
 534
 535                                         field_infos.CopyTo  (field_info_arr, 0);
 536                                         field_values.CopyTo (field_values_arr, 0);
 537
 538                                         prop_values.CopyTo  (prop_values_arr, 0);
 539                                         prop_infos.CopyTo   (prop_info_arr, 0);
 540
 541                                         cb = new CustomAttributeBuilder (
 542                                                 (ConstructorInfo) constructor, pos_values,
 543                                                 prop_info_arr, prop_values_arr,
 544                                                 field_info_arr, field_values_arr);
 545                                 }
 546                                 else
 547                                         cb = new CustomAttributeBuilder (
 548                                                 (ConstructorInfo) constructor, pos_values);
 549                         } catch (NullReferenceException) {
 550                                 //
 551                                 // Don't know what to do here
 552                                 //
 553                                 Report.Warning (
 554                                         -101, Location, "NullReferenceException while trying to create attribute." +
 555                                         "Something's wrong!");
 556                         } catch (Exception e) {
 557                                 //
 558                                 // Sample:
 559                                 // using System.ComponentModel;
 560                                 // [DefaultValue (CollectionChangeAction.Add)]
 561                                 // class X { static void Main () {} }
 562                                 //
 563                                 Report.Warning (
 564                                         -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);
 565                         }
 566
 567                         return cb;
 568                 }
 569
 570                 /// <summary>
 571                 ///   Get a string containing a list of valid targets for the attribute 'attr'
 572                 /// </summary>
 573                 static string GetValidTargets (Attribute attr)
 574                 {
 575                         StringBuilder sb = new StringBuilder ();
 576                         AttributeTargets targets = attr.GetAttributeUsage ().ValidOn;
 577
 578                         if ((targets & AttributeTargets.Assembly) != 0)
 579                                 sb.Append ("'assembly' ");
 580
 581                         if ((targets & AttributeTargets.Class) != 0)
 582                                 sb.Append ("'class' ");
 583
 584                         if ((targets & AttributeTargets.Constructor) != 0)
 585                                 sb.Append ("'constructor' ");
 586
 587                         if ((targets & AttributeTargets.Delegate) != 0)
 588                                 sb.Append ("'delegate' ");
 589
 590                         if ((targets & AttributeTargets.Enum) != 0)
 591                                 sb.Append ("'enum' ");
 592
 593                         if ((targets & AttributeTargets.Event) != 0)
 594                                 sb.Append ("'event' ");
 595
 596                         if ((targets & AttributeTargets.Field) != 0)
 597                                 sb.Append ("'field' ");
 598
 599                         if ((targets & AttributeTargets.Interface) != 0)
 600                                 sb.Append ("'interface' ");
 601
 602                         if ((targets & AttributeTargets.Method) != 0)
 603                                 sb.Append ("'method' ");
 604
 605                         if ((targets & AttributeTargets.Module) != 0)
 606                                 sb.Append ("'module' ");
 607
 608                         if ((targets & AttributeTargets.Parameter) != 0)
 609                                 sb.Append ("'parameter' ");
 610
 611                         if ((targets & AttributeTargets.Property) != 0)
 612                                 sb.Append ("'property' ");
 613
 614                         if ((targets & AttributeTargets.ReturnValue) != 0)
 615                                 sb.Append ("'return' ");
 616
 617                         if ((targets & AttributeTargets.Struct) != 0)
 618                                 sb.Append ("'struct' ");
 619
 620                         return sb.ToString ();
 621
 622                 }
 623
 624                 public static void Error_AttributeNotValidForElement (Attribute a, Location loc)
 625                 {
 626                         Report.Error (
 627                                 592, loc, "Attribute '" + a.Name +
 628                                 "' is not valid on this declaration type. " +
 629                                 "It is valid on " + GetValidTargets (a) + "declarations only.");
 630                 }
 631
 632
 633                 /// <summary>
 634                 /// Returns AttributeUsage attribute for this type
 635                 /// </summary>
 636                 public AttributeUsageAttribute GetAttributeUsage ()
 637                 {
 638                         AttributeUsageAttribute ua = usage_attr_cache [Type] as AttributeUsageAttribute;
 639                         if (ua != null)
 640                                 return ua;
 641
 642                         Class attr_class = TypeManager.LookupClass (Type);
 643
 644                         if (attr_class == null) {
 645                                 object[] usage_attr = Type.GetCustomAttributes (TypeManager.attribute_usage_type, true);
 646                                 ua = (AttributeUsageAttribute)usage_attr [0];
 647                                 usage_attr_cache.Add (Type, ua);
 648                                 return ua;
 649                         }
 650
 651                         return attr_class.AttributeUsage;
 652                 }
 653
 654
 655                 //
 656                 // This pulls the condition name out of a Conditional attribute
 657                 //
 658                 public string Conditional_GetConditionName ()
 659                 {
 660                         //
 661                         // So we have a Conditional, pull the data out.
 662                         //
 663                         if (Arguments == null || Arguments [0] == null){
 664                                 Error_AttributeConstructorMismatch ();
 665                                 return null;
 666                         }
 667
 668                         ArrayList pos_args = (ArrayList) Arguments [0];
 669                         if (pos_args.Count != 1){
 670                                 Error_AttributeConstructorMismatch ();
 671                                 return null;
 672                         }
 673
 674                         Argument arg = (Argument) pos_args [0];
 675                         if (!(arg.Expr is StringConstant)){
 676                                 Error_AttributeConstructorMismatch ();
 677                                 return null;
 678                         }
 679
 680                         return ((StringConstant) arg.Expr).Value;
 681                 }
 682
 683                 public string IndexerName_GetIndexerName (EmitContext ec)
 684                 {
 685                         if (Arguments == null || Arguments [0] == null){
 686                                 Error_AttributeConstructorMismatch ();
 687                                 return null;
 688                         }
 689                         ArrayList pos_args = (ArrayList) Arguments [0];
 690                         if (pos_args.Count != 1) {
 691                                 Error_AttributeConstructorMismatch ();
 692                                 return null;
 693                         }
 694
 695                         Argument arg = (Argument) pos_args [0];
 696                         if (!arg.Resolve (ec, Location))
 697                                 return null;
 698
 699                         StringConstant sc = arg.Expr as StringConstant;
 700                         if (sc == null){
 701                                 Error_AttributeConstructorMismatch ();
 702                                 return null;
 703                         }
 704
 705                         return sc.Value;
 706                 }
 707
 708                 /// <summary>
 709                 /// Returns condition of ConditionalAttribute
 710                 /// </summary>
 711                 public string GetConditionalAttributeValue (DeclSpace ds)
 712                 {
 713                         if (pos_values == null) {
 714                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 715
 716                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 717                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 718                                 Resolve (ec);
 719                         }
 720
 721                         // Some error occurred
 722                         if (pos_values [0] == null)
 723                                 return null;
 724
 725                         return (string)pos_values [0];
 726                 }
 727
 728                 /// <summary>
 729                 /// Creates the instance of ObsoleteAttribute from this attribute instance
 730                 /// </summary>
 731                 public ObsoleteAttribute GetObsoleteAttribute (DeclSpace ds)
 732                 {
 733                         if (pos_values == null) {
 734                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 735
 736                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 737                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 738                                 Resolve (ec);
 739                         }
 740
 741                         // Some error occurred
 742                         if (pos_values == null)
 743                                 return null;
 744
 745                         if (pos_values.Length == 0)
 746                                 return new ObsoleteAttribute ();
 747
 748                         if (pos_values.Length == 1)
 749                                 return new ObsoleteAttribute ((string)pos_values [0]);
 750
 751                         return new ObsoleteAttribute ((string)pos_values [0], (bool)pos_values [1]);
 752                 }
 753
 754                 /// <summary>
 755                 /// Returns value of CLSCompliantAttribute contructor parameter but because the method can be called
 756                 /// before ApplyAttribute. We need to resolve the arguments.
 757                 /// This situation occurs when class deps is differs from Emit order.
 758                 /// </summary>
 759                 public bool GetClsCompliantAttributeValue (DeclSpace ds)
 760                 {
 761                         if (pos_values == null) {
 762                                 EmitContext ec = new EmitContext (ds, ds, Location, null, null, 0, false);
 763
 764                                 // TODO: It is not neccessary to call whole Resolve (ApplyAttribute does it now) we need only ctor args.
 765                                 // But because a lot of attribute class code must be rewritten will be better to wait...
 766                                 Resolve (ec);
 767                         }
 768
 769                         // Some error occurred
 770                         if (pos_values [0] == null)
 771                                 return false;
 772
 773                         return (bool)pos_values [0];
 774                 }
 775
 776                 public object GetPositionalValue (int i)
 777                 {
 778                         return (pos_values == null) ? null : pos_values[i];
 779                 }
 780
 781                 object GetFieldValue (string name)
 782                 {
 783                         int i;
 784                         if (field_info_arr == null)
 785                                 return null;
 786                         i = 0;
 787                         foreach (FieldInfo fi in field_info_arr) {
 788                                 if (fi.Name == name)
 789                                         return field_values_arr [i];
 790                                 i++;
 791                         }
 792                         return null;
 793                 }
 794
 795                 public UnmanagedMarshal GetMarshal ()
 796                 {
 797                         object o = GetFieldValue ("ArraySubType");
 798                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;
 799
 800                         switch (UnmanagedType) {
 801                         case UnmanagedType.CustomMarshaler:
 802                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
 803                                                                        BindingFlags.Static | BindingFlags.Public);
 804                                 if (define_custom == null)
 805                                         return null;
 806
 807                                 object [] args = new object [4];
 808                                 args [0] = GetFieldValue ("MarshalTypeRef");
 809                                 args [1] = GetFieldValue ("MarshalCookie");
 810                                 args [2] = GetFieldValue ("MarshalType");
 811                                 args [3] = Guid.Empty;
 812                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
 813
 814                         case UnmanagedType.LPArray:
 815                                 return UnmanagedMarshal.DefineLPArray (array_sub_type);
 816
 817                         case UnmanagedType.SafeArray:
 818                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
 819
 820                         case UnmanagedType.ByValArray:
 821                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue ("SizeConst"));
 822
 823                         case UnmanagedType.ByValTStr:
 824                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue ("SizeConst"));
 825
 826                         default:
 827                                 return UnmanagedMarshal.DefineUnmanagedMarshal (UnmanagedType);
 828                         }
 829                 }
 830
 831                 public bool IsInternalCall
 832                 {
 833                         get { return ImplOptions == MethodImplOptions.InternalCall; }
 834                 }
 835
 836                 /// <summary>
 837                 /// Emit attribute for Attributable symbol
 838                 /// </summary>
 839                 public void Emit (EmitContext ec, Attributable ias, ListDictionary emitted_attr)
 840                 {
 841                         CustomAttributeBuilder cb = Resolve (ec);
 842                         if (cb == null)
 843                                 return;
 844
 845                         AttributeUsageAttribute usage_attr = GetAttributeUsage ();
 846                         if ((usage_attr.ValidOn & ias.AttributeTargets) == 0) {
 847                                         Error_AttributeNotValidForElement (this, Location);
 848                                 return;
 849                         }
 850
 851                         ias.ApplyAttributeBuilder (this, cb);
 852
 853                         if (!usage_attr.AllowMultiple && emitted_attr.Contains (Target)) {
 854                                 Report.Error (579, Location, "Duplicate '" + Name + "' attribute");
 855                         }
 856
 857                         emitted_attr [Type] = Target;
 858
 859                         // Here we are testing attribute arguments for array usage (error 3016)
 860                         if (ias.IsClsCompliaceRequired (ec.DeclSpace)) {
 861                                 if (Arguments == null)
 862                                         return;
 863
 864                                 ArrayList pos_args = (ArrayList) Arguments [0];
 865                                 if (pos_args != null) {
 866                                         foreach (Argument arg in pos_args) {
 867                                                 // Type is undefined (was error 246)
 868                                                 if (arg.Type == null)
 869                                                         return;
 870
 871                                                 if (arg.Type.IsArray) {
 872                                                         Report.Error_T (3016, Location);
 873                                                         return;
 874                                                 }
 875                                         }
 876                                 }
 877
 878                                 if (Arguments.Count < 2)
 879                                         return;
 880
 881                                 ArrayList named_args = (ArrayList) Arguments [1];
 882                                 foreach (DictionaryEntry de in named_args) {
 883                                         Argument arg  = (Argument) de.Value;
 884
 885                                         // Type is undefined (was error 246)
 886                                         if (arg.Type == null)
 887                                                 return;
 888
 889                                         if (arg.Type.IsArray) {
 890                                                 Report.Error_T (3016, Location);
 891                                                 return;
 892                                         }
 893                                 }
 894                         }
 895                 }
 896
 897                 public object GetValue (EmitContext ec, Constant c, Type target)
 898                 {
 899                         if (Convert.ImplicitConversionExists (ec, c, target))
 900                                 return c.GetValue ();
 901
 902                         Convert.Error_CannotImplicitConversion (Location, c.Type, target);
 903                         return null;
 904                 }
 905
 906                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,
 907                                                           MethodAttributes flags, Type ret_type, Type [] param_types)
 908                 {
 909                         //
 910                         // We extract from the attribute the information we need
 911                         //
 912
 913                         if (Arguments == null) {
 914                                 Console.WriteLine ("Internal error : this is not supposed to happen !");
 915                                 return null;
 916                         }
 917
 918                         ResolveType (ec, true);
 919                         if (Type == null)
 920                                 return null;
 921
 922                         ArrayList named_args = new ArrayList ();
 923
 924                         ArrayList pos_args = (ArrayList) Arguments [0];
 925                         if (Arguments.Count > 1)
 926                                 named_args = (ArrayList) Arguments [1];
 927
 928
 929                         string dll_name = null;
 930
 931                         Argument tmp = (Argument) pos_args [0];
 932
 933                         if (!tmp.Resolve (ec, Location))
 934                                 return null;
 935
 936                         if (tmp.Expr is Constant)
 937                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();
 938                         else {
 939                                 Error_AttributeArgumentNotValid (Location);
 940                                 return null;
 941                         }
 942
 943                         // Now we process the named arguments
 944                         CallingConvention cc = CallingConvention.Winapi;
 945                         CharSet charset = CharSet.Ansi;
 946                         bool preserve_sig = true;
 947 #if FIXME
 948                         bool exact_spelling = false;
 949 #endif
 950                         bool set_last_err = false;
 951                         string entry_point = null;
 952
 953                         for (int i = 0; i < named_args.Count; i++) {
 954
 955                                 DictionaryEntry de = (DictionaryEntry) named_args [i];
 956
 957                                 string member_name = (string) de.Key;
 958                                 Argument a  = (Argument) de.Value;
 959
 960                                 if (!a.Resolve (ec, Location))
 961                                         return null;
 962
 963                                 Expression member = Expression.MemberLookup (
 964                                         ec, Type, member_name,
 965                                         MemberTypes.Field | MemberTypes.Property,
 966                                         BindingFlags.Public | BindingFlags.Instance,
 967                                         Location);
 968
 969                                 if (member == null || !(member is FieldExpr)) {
 970                                         Error_InvalidNamedArgument (member_name);
 971                                         return null;
 972                                 }
 973
 974                                 if (member is FieldExpr) {
 975                                         FieldExpr fe = (FieldExpr) member;
 976                                         FieldInfo fi = fe.FieldInfo;
 977
 978                                         if (fi.IsInitOnly) {
 979                                                 Error_InvalidNamedArgument (member_name);
 980                                                 return null;
 981                                         }
 982
 983                                         if (a.Expr is Constant) {
 984                                                 Constant c = (Constant) a.Expr;
 985
 986                                                 try {
 987                                                         if (member_name == "CallingConvention"){
 988                                                                 object val = GetValue (ec, c, typeof (CallingConvention));
 989                                                                 if (val == null)
 990                                                                         return null;
 991                                                                 cc = (CallingConvention) val;
 992                                                         } else if (member_name == "CharSet"){
 993                                                                 charset = (CharSet) c.GetValue ();
 994                                                         } else if (member_name == "EntryPoint")
 995                                                                 entry_point = (string) c.GetValue ();
 996                                                         else if (member_name == "SetLastError")
 997                                                                 set_last_err = (bool) c.GetValue ();
 998 #if FIXME
 999                                                         else if (member_name == "ExactSpelling")
1000                                                                 exact_spelling = (bool) c.GetValue ();
1001 #endif
1002                                                         else if (member_name == "PreserveSig")
1003                                                                 preserve_sig = (bool) c.GetValue ();
1004                                                 } catch (InvalidCastException){
1005                                                         Error_InvalidNamedArgument (member_name);
1006                                                         Error_AttributeArgumentNotValid (Location);
1007                                                 }
1008                                         } else {
1009                                                 Error_AttributeArgumentNotValid (Location);
1010                                                 return null;
1011                                         }
1012
1013                                 }
1014                         }
1015
1016                         if (entry_point == null)
1017                                 entry_point = name;
1018                         if (set_last_err)
1019                                 charset = (CharSet)((int)charset | 0x40);
1020
1021                         MethodBuilder mb = builder.DefinePInvokeMethod (
1022                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,
1023                                 CallingConventions.Standard,
1024                                 ret_type,
1025                                 param_types,
1026                                 cc,
1027                                 charset);
1028
1029                         if (preserve_sig)
1030                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);
1031
1032                         return mb;
1033                 }
1034
1035                 private Expression GetValue ()
1036                 {
1037                         if ((Arguments == null) || (Arguments.Count < 1))
1038                                 return null;
1039                         ArrayList al = (ArrayList) Arguments [0];
1040                         if ((al == null) || (al.Count < 1))
1041                                 return null;
1042                         Argument arg = (Argument) al [0];
1043                         if ((arg == null) || (arg.Expr == null))
1044                                 return null;
1045                         return arg.Expr;
1046                 }
1047
1048                 public string GetString ()
1049                 {
1050                         Expression e = GetValue ();
1051                         if (e is StringLiteral)
1052                                 return (e as StringLiteral).Value;
1053                         return null;
1054                 }
1055
1056                 public bool GetBoolean ()
1057                 {
1058                         Expression e = GetValue ();
1059                         if (e is BoolLiteral)
1060                                 return (e as BoolLiteral).Value;
1061                         return false;
1062                 }
1063         }
1064
1065
1066         /// <summary>
1067         /// For global attributes (assembly, module) we need special handling.
1068         /// Attributes can be located in the several files
1069         /// </summary>
1070         public class GlobalAttribute: Attribute
1071         {
1072                 public readonly NamespaceEntry ns;
1073
1074                 public GlobalAttribute (TypeContainer container, string target, string name, ArrayList args, Location loc):
1075                         base (target, name, args, loc)
1076                 {
1077                         ns = container.NamespaceEntry;
1078                 }
1079
1080                 protected override Type CheckAttributeType (EmitContext ec, bool complain)
1081                 {
1082                         NamespaceEntry old = ec.DeclSpace.NamespaceEntry;
1083                         if (old == null || old.NS == null || old.NS == Namespace.Root)
1084                                 ec.DeclSpace.NamespaceEntry = ns;
1085                         return base.CheckAttributeType (ec, complain);
1086                 }
1087         }
1088
1089         public class Attributes {
1090                 public ArrayList Attrs;
1091
1092                 public Attributes (Attribute a)
1093                 {
1094                         Attrs = new ArrayList ();
1095                         Attrs.Add (a);
1096                 }
1097
1098                 public Attributes (ArrayList attrs)
1099                 {
1100                         Attrs = attrs;
1101                 }
1102
1103                 public void AddAttributes (ArrayList attrs)
1104                 {
1105                         Attrs.AddRange (attrs);
1106                 }
1107
1108                 /// <summary>
1109                 /// Checks whether attribute target is valid for the current element
1110                 /// </summary>
1111                 public void CheckTargets (string[] possible_targets)
1112                 {
1113                         foreach (Attribute a in Attrs) {
1114                                 if (a.Target == null) {
1115                                         a.Target = possible_targets [0];
1116                                         continue;
1117                                 }
1118
1119                                 if (((IList) possible_targets).Contains (a.Target))
1120                                         continue;
1121
1122                                 StringBuilder sb = new StringBuilder ();
1123                                 foreach (string s in possible_targets) {
1124                                         sb.Append (s);
1125                                         sb.Append (", ");
1126                                 }
1127                                 sb.Remove (sb.Length - 2, 2);
1128                                 Report.Error_T (657, a.Location, a.Target, sb.ToString ());
1129                         }
1130                 }
1131
1132                 private Attribute Search (Type t, EmitContext ec, bool complain)
1133                 {
1134                         foreach (Attribute a in Attrs) {
1135                                 if (a.ResolveType (ec, false) == t)
1136                                         return a;
1137                         }
1138                         return null;
1139                 }
1140
1141                 public Attribute Search (Type t, EmitContext ec)
1142                 {
1143                         return Search (t, ec, true);
1144                 }
1145
1146                 /// <summary>
1147                 /// Returns all attributes of type 't'. Use it when attribute is AllowMultiple = true
1148                 /// </summary>
1149                 public Attribute[] SearchMulti (Type t, EmitContext ec)
1150                 {
1151                         ArrayList ar = null;
1152
1153                         foreach (Attribute a in Attrs) {
1154                                 if (a.ResolveType (ec, false) == t) {
1155                                         if (ar == null)
1156                                                 ar = new ArrayList ();
1157                                         ar.Add (a);
1158                                 }
1159                         }
1160
1161                         return ar == null ? null : ar.ToArray (typeof (Attribute)) as Attribute[];
1162                 }
1163
1164                 public void Emit (EmitContext ec, Attributable ias)
1165                 {
1166                         ListDictionary ld = new ListDictionary ();
1167
1168                         foreach (Attribute a in Attrs)
1169                                 a.Emit (ec, ias, ld);
1170                 }
1171
1172                 public bool Contains (Type t, EmitContext ec)
1173                 {
1174                         return Search (t, ec) != null;
1175                 }
1176
1177                 public Attribute GetClsCompliantAttribute (EmitContext ec)
1178                 {
1179                         return Search (TypeManager.cls_compliant_attribute_type, ec, false);
1180                 }
1181
1182                 /// <summary>
1183                 /// Pulls the IndexerName attribute from an Indexer if it exists.
1184                 /// </summary>
1185                 public string ScanForIndexerName (EmitContext ec)
1186                 {
1187                         Attribute a = Search (TypeManager.indexer_name_type, ec);
1188                         if (a == null)
1189                                 return null;
1190
1191                         // Remove the attribute from the list
1192                         //TODO: It is very close to hack and it can crash here
1193                         Attrs.Remove (a);
1194
1195                         return a.IndexerName_GetIndexerName (ec);
1196                 }
1197
1198         }
1199
1200         /// <summary>
1201         /// Helper class for attribute verification routine.
1202         /// </summary>
1203         sealed class AttributeTester
1204         {
1205                 static PtrHashtable analyzed_types = new PtrHashtable ();
1206                 static PtrHashtable analyzed_types_obsolete = new PtrHashtable ();
1207                 static PtrHashtable analyzed_member_obsolete = new PtrHashtable ();
1208                 static PtrHashtable analyzed_method_excluded = new PtrHashtable ();
1209
1210                 private AttributeTester ()
1211                 {
1212                 }
1213
1214                 /// <summary>
1215                 /// Returns true if parameters of two compared methods are CLS-Compliant.
1216                 /// It tests differing only in ref or out, or in array rank.
1217                 /// </summary>
1218                 public static bool AreOverloadedMethodParamsClsCompliant (Type[] types_a, Type[] types_b)
1219                 {
1220                         if (types_a == null || types_b == null)
1221                                 return true;
1222
1223                         if (types_a.Length != types_b.Length)
1224                                 return true;
1225
1226                         for (int i = 0; i < types_b.Length; ++i) {
1227                                 Type aType = types_a [i];
1228                                 Type bType = types_b [i];
1229
1230                                 if (aType.IsArray && bType.IsArray && aType.GetArrayRank () != bType.GetArrayRank () && aType.GetElementType () == bType.GetElementType ()) {
1231                                         return false;
1232                                 }
1233
1234                                 Type aBaseType = aType;
1235                                 bool is_either_ref_or_out = false;
1236
1237                                 if (aType.IsByRef || aType.IsPointer) {
1238                                         aBaseType = aType.GetElementType ();
1239                                         is_either_ref_or_out = true;
1240                                 }
1241
1242                                 Type bBaseType = bType;
1243                                 if (bType.IsByRef || bType.IsPointer)
1244                                 {
1245                                         bBaseType = bType.GetElementType ();
1246                                         is_either_ref_or_out = !is_either_ref_or_out;
1247                                 }
1248
1249                                 if (aBaseType != bBaseType)
1250                                         continue;
1251
1252                                 if (is_either_ref_or_out)
1253                                         return false;
1254                         }
1255                         return true;
1256                 }
1257
1258                 /// <summary>
1259                 /// Goes through all parameters and test if they are CLS-Compliant.
1260                 /// </summary>
1261                 public static bool AreParametersCompliant (Parameter[] fixedParameters, Location loc)
1262                 {
1263                         if (fixedParameters == null)
1264                                 return true;
1265
1266                         foreach (Parameter arg in fixedParameters) {
1267                                 if (!AttributeTester.IsClsCompliant (arg.ParameterType)) {
1268                                         Report.Error_T (3001, loc, arg.GetSignatureForError ());
1269                                         return false;
1270                                 }
1271                         }
1272                         return true;
1273                 }
1274
1275
1276                 /// <summary>
1277                 /// This method tests the CLS compliance of external types. It doesn't test type visibility.
1278                 /// </summary>
1279                 public static bool IsClsCompliant (Type type)
1280                 {
1281                         if (type == null)
1282                                 return true;
1283
1284                         object type_compliance = analyzed_types[type];
1285                         if (type_compliance != null)
1286                                 return type_compliance == TRUE;
1287
1288                         if (type.IsPointer) {
1289                                 analyzed_types.Add (type, null);
1290                                 return false;
1291                         }
1292
1293                         bool result;
1294                         if (type.IsArray || type.IsByRef)       {
1295                                 result = IsClsCompliant (TypeManager.GetElementType (type));
1296                         } else {
1297                                 result = AnalyzeTypeCompliance (type);
1298                         }
1299                         analyzed_types.Add (type, result ? TRUE : FALSE);
1300                         return result;
1301                 }
1302
1303                 static object TRUE = new object ();
1304                 static object FALSE = new object ();
1305
1306                 /// <summary>
1307                 /// Non-hierarchical CLS Compliance analyzer
1308                 /// </summary>
1309                 public static bool IsComplianceRequired (MemberInfo mi, DeclSpace ds)
1310                 {
1311                         DeclSpace temp_ds = TypeManager.LookupDeclSpace (mi.DeclaringType);
1312
1313                         // Type is external, we can get attribute directly
1314                         if (temp_ds == null) {
1315                                 object[] cls_attribute = mi.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1316                                 return (cls_attribute.Length == 1 && ((CLSCompliantAttribute)cls_attribute[0]).IsCompliant);
1317                         }
1318
1319                         string tmp_name;
1320                         // Interface doesn't store full name
1321                         if (temp_ds is Interface)
1322                                 tmp_name = mi.Name;
1323                         else
1324                                 tmp_name = String.Concat (temp_ds.Name, ".", mi.Name);
1325
1326                         MemberCore mc = temp_ds.GetDefinition (tmp_name) as MemberCore;
1327                         return mc.IsClsCompliaceRequired (ds);
1328                 }
1329
1330                 public static void VerifyModulesClsCompliance ()
1331                 {
1332                         Module[] modules = TypeManager.Modules;
1333                         if (modules == null)
1334                                 return;
1335
1336                         // The first module is generated assembly
1337                         for (int i = 1; i < modules.Length; ++i) {
1338                                 Module module = modules [i];
1339                                 if (!IsClsCompliant (module)) {
1340                                         Report.Error_T (3013, module.Name);
1341                                         return;
1342                                 }
1343                         }
1344                 }
1345
1346                 static bool IsClsCompliant (ICustomAttributeProvider attribute_provider)
1347                 {
1348                         object[] CompliantAttribute = attribute_provider.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1349                         if (CompliantAttribute.Length == 0)
1350                                 return false;
1351
1352                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1353                 }
1354
1355                 static bool AnalyzeTypeCompliance (Type type)
1356                 {
1357                         DeclSpace ds = TypeManager.LookupDeclSpace (type);
1358                         if (ds != null) {
1359                                 return ds.IsClsCompliaceRequired (ds.Parent);
1360                         }
1361
1362                         if (type.IsGenericParameter)
1363                                 return false;
1364
1365                         object[] CompliantAttribute = type.GetCustomAttributes (TypeManager.cls_compliant_attribute_type, false);
1366                         if (CompliantAttribute.Length == 0)
1367                                 return IsClsCompliant (type.Assembly);
1368
1369                         return ((CLSCompliantAttribute)CompliantAttribute[0]).IsCompliant;
1370                 }
1371
1372                 /// <summary>
1373                 /// Returns instance of ObsoleteAttribute when type is obsolete
1374                 /// </summary>
1375                 public static ObsoleteAttribute GetObsoleteAttribute (Type type)
1376                 {
1377                         object type_obsolete = analyzed_types_obsolete [type];
1378                         if (type_obsolete == FALSE)
1379                                 return null;
1380
1381                         if (type_obsolete != null)
1382                                 return (ObsoleteAttribute)type_obsolete;
1383
1384                         ObsoleteAttribute result = null;
1385                         if (type.IsByRef || type.IsArray || type.IsPointer) {
1386                                 result = GetObsoleteAttribute (TypeManager.GetElementType (type));
1387                         } else if (type.IsGenericParameter || type.IsGenericInstance)
1388                                 return null;
1389                         else {
1390                                 DeclSpace type_ds = TypeManager.LookupDeclSpace (type);
1391
1392                                 // Type is external, we can get attribute directly
1393                                 if (type_ds == null) {
1394                                         object[] attribute = type.GetCustomAttributes (TypeManager.obsolete_attribute_type, false);
1395                                         if (attribute.Length == 1)
1396                                                 result = (ObsoleteAttribute)attribute [0];
1397                                 } else {
1398                                         result = type_ds.GetObsoleteAttribute (type_ds);
1399                                 }
1400                         }
1401
1402                         analyzed_types_obsolete.Add (type, result == null ? FALSE : result);
1403                         return result;
1404                 }
1405
1406                 /// <summary>
1407                 /// Returns instance of ObsoleteAttribute when method is obsolete
1408                 /// </summary>
1409                 public static ObsoleteAttribute GetMethodObsoleteAttribute (MethodBase mb)
1410                 {
1411                         IMethodData mc = TypeManager.GetMethod (mb);
1412                         if (mc != null)
1413                                 return mc.GetObsoleteAttribute ();
1414
1415                         return GetMemberObsoleteAttribute (mb);
1416                 }
1417
1418                 /// <summary>
1419                 /// Returns instance of ObsoleteAttribute when member is obsolete
1420                 /// </summary>
1421                 public static ObsoleteAttribute GetMemberObsoleteAttribute (MemberInfo mi)
1422                 {
1423                         object type_obsolete = analyzed_member_obsolete [mi];
1424                         if (type_obsolete == FALSE)
1425                                 return null;
1426
1427                         if (type_obsolete != null)
1428                                 return (ObsoleteAttribute)type_obsolete;
1429
1430                         if ((mi.DeclaringType is TypeBuilder) || mi.DeclaringType.IsGenericInstance)
1431                                 return null;
1432
1433                         ObsoleteAttribute oa = System.Attribute.GetCustomAttribute (mi, TypeManager.obsolete_attribute_type, false) as ObsoleteAttribute;
1434                         analyzed_member_obsolete.Add (mi, oa == null ? FALSE : oa);
1435                         return oa;
1436                 }
1437
1438                 /// <summary>
1439                 /// Common method for Obsolete error/warning reporting.
1440                 /// </summary>
1441                 public static void Report_ObsoleteMessage (ObsoleteAttribute oa, string member, Location loc)
1442                 {
1443                         if (oa.IsError) {
1444                                 Report.Error_T (619, loc, member, oa.Message);
1445                                 return;
1446                         }
1447
1448                         if (oa.Message == null) {
1449                                 Report.Warning_T (612, loc, member);
1450                                 return;
1451                         }
1452                         Report.Warning_T (618, loc, member, oa.Message);
1453                 }
1454
1455                 public static bool IsConditionalMethodExcluded (MethodBase mb)
1456                 {
1457                         object excluded = analyzed_method_excluded [mb];
1458                         if (excluded != null)
1459                                 return excluded == TRUE ? true : false;
1460
1461                         if (mb.Mono_IsInflatedMethod)
1462                                 return false;
1463
1464                         ConditionalAttribute[] attrs = mb.GetCustomAttributes (TypeManager.conditional_attribute_type, true) as ConditionalAttribute[];
1465                         if (attrs.Length == 0) {
1466                                 analyzed_method_excluded.Add (mb, FALSE);
1467                                 return false;
1468                         }
1469
1470                         foreach (ConditionalAttribute a in attrs) {
1471                                 if (RootContext.AllDefines.Contains (a.ConditionString)) {
1472                                         analyzed_method_excluded.Add (mb, FALSE);
1473                                         return false;
1474                                 }
1475                         }
1476                         analyzed_method_excluded.Add (mb, TRUE);
1477                         return true;
1478                 }
1479         }
1480 }