mcs/mcs/attribute.cs

   1 //\r
   2 // attribute.cs: Attribute Handler\r
   3 //\r
   4 // Author: Ravi Pratap (ravi@ximian.com)\r
   5 //\r
   6 // Licensed under the terms of the GNU GPL\r
   7 //\r
   8 // (C) 2001 Ximian, Inc (http://www.ximian.com)\r
   9 //\r
  10 //\r
  11 \r
  12 using System;\r
  13 using System.Diagnostics;\r
  14 using System.Collections;\r
  15 using System.Reflection;\r
  16 using System.Reflection.Emit;\r
  17 using System.Runtime.InteropServices;\r
  18 using System.Runtime.CompilerServices;\r
  19 using System.Text;\r
  20 \r
  21 namespace Mono.CSharp {\r
  22 \r
  23         public class Attribute {\r
  24                 public readonly string    Name;\r
  25                 public readonly ArrayList Arguments;\r
  26 \r
  27                 Location Location;\r
  28 \r
  29                 public Type Type;\r
  30                 \r
  31                 //\r
  32                 // The following are only meaningful when the attribute\r
  33                 // being emitted is an AttributeUsage attribute\r
  34                 //\r
  35                 AttributeTargets Targets;\r
  36                 bool AllowMultiple;\r
  37                 bool Inherited;\r
  38 \r
  39                 bool UsageAttr = false;\r
  40                 \r
  41                 MethodImplOptions ImplOptions;\r
  42                 UnmanagedType     UnmanagedType;\r
  43                 CustomAttributeBuilder cb;\r
  44         \r
  45                 // non-null if named args present after Resolve () is called\r
  46                 PropertyInfo [] prop_info_arr;\r
  47                 FieldInfo [] field_info_arr;\r
  48                 object [] field_values_arr;\r
  49                 object [] prop_values_arr;\r
  50                 \r
  51                 public Attribute (string name, ArrayList args, Location loc)\r
  52                 {\r
  53                         Name = name;\r
  54                         Arguments = args;\r
  55                         Location = loc;\r
  56                 }\r
  57 \r
  58                 void Error_InvalidNamedArgument (string name)\r
  59                 {\r
  60                         Report.Error (617, Location, "'" + name + "' is not a valid named attribute " +\r
  61                                       "argument. Named attribute arguments must be fields which are not " +\r
  62                                       "readonly, static or const, or properties with a set accessor which "+\r
  63                                       "are not static.");\r
  64                 }\r
  65 \r
  66                 static void Error_AttributeArgumentNotValid (Location loc)\r
  67                 {\r
  68                         Report.Error (182, loc,\r
  69                                       "An attribute argument must be a constant expression, typeof " +\r
  70                                       "expression or array creation expression");\r
  71                 }\r
  72 \r
  73                 static void Error_AttributeConstructorMismatch (Location loc)\r
  74                 {\r
  75                         Report.Error (-6, loc,\r
  76                                       "Could not find a constructor for this argument list.");\r
  77                 }\r
  78 \r
  79                 /// <summary>\r
  80                 ///   Tries to resolve the type of the attribute. Flags an error if it can't.\r
  81                 /// </summary>\r
  82                 private Type CheckAttributeType (EmitContext ec) {\r
  83                         Type t;\r
  84                         bool isattributeclass = true;\r
  85                         \r
  86                         t = RootContext.LookupType (ec.DeclSpace, Name, true, Location);\r
  87                         if (t != null) {\r
  88                                 isattributeclass = t.IsSubclassOf (TypeManager.attribute_type);\r
  89                                 if (isattributeclass)\r
  90                                         return t;\r
  91                         }\r
  92                         t = RootContext.LookupType (ec.DeclSpace, Name + "Attribute", true, Location);\r
  93                         if (t != null) {\r
  94                                 if (t.IsSubclassOf (TypeManager.attribute_type))\r
  95                                         return t;\r
  96                         }\r
  97                         if (!isattributeclass) {\r
  98                                 Report.Error (616, Location, "'" + Name + "': is not an attribute class");\r
  99                                 return null;\r
 100                         }\r
 101                         if (t != null) {\r
 102                                 Report.Error (616, Location, "'" + Name + "Attribute': is not an attribute class");\r
 103                                 return null;\r
 104                         }\r
 105                         Report.Error (\r
 106                                 246, Location, "Could not find attribute '" + Name + "' (are you" +\r
 107                                 " missing a using directive or an assembly reference ?)");\r
 108                         return null;\r
 109                 }\r
 110 \r
 111                 public Type ResolveType (EmitContext ec)\r
 112                 {\r
 113                         Type = CheckAttributeType (ec);\r
 114                         return Type;\r
 115                 }\r
 116 \r
 117                 /// <summary>\r
 118                 ///   Validates the guid string\r
 119                 /// </summary>\r
 120                 bool ValidateGuid (string guid)\r
 121                 {\r
 122                         try {\r
 123                                 new Guid (guid);\r
 124                                 return true;\r
 125                         } catch {\r
 126                                 Report.Error (647, Location, "Format of GUID is invalid: " + guid);\r
 127                                 return false;\r
 128                         }\r
 129                 }\r
 130 \r
 131                 //\r
 132                 // Given an expression, if the expression is a valid attribute-argument-expression\r
 133                 // returns an object that can be used to encode it, or null on failure.\r
 134                 //\r
 135                 public static bool GetAttributeArgumentExpression (Expression e, Location loc, out object result)\r
 136                 {\r
 137                         if (e is Constant) {\r
 138                                 result = ((Constant) e).GetValue ();\r
 139                                 return true;\r
 140                         } else if (e is TypeOf) {\r
 141                                 result = ((TypeOf) e).TypeArg;\r
 142                                 return true;\r
 143                         } else if (e is ArrayCreation){\r
 144                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();\r
 145                                 if (result != null)\r
 146                                         return true;\r
 147                         } else if (e is EmptyCast) {
 148                                 result = e;
 149                                 if (((EmptyCast) e).Child is Constant) {
 150                                         result = ((Constant) ((EmptyCast)e).Child).GetValue();
 151                                 }
 152                                 return true;
 153                         }
 154 \r
 155                         result = null;\r
 156                         Error_AttributeArgumentNotValid (loc);\r
 157                         return false;\r
 158                 }\r
 159                 \r
 160                 public CustomAttributeBuilder Resolve (EmitContext ec)\r
 161                 {\r
 162                         if (Type == null)\r
 163                                 Type = CheckAttributeType (ec);\r
 164                         if (Type == null)\r
 165                                 return null;\r
 166 \r
 167                         bool MethodImplAttr = false;\r
 168                         bool MarshalAsAttr = false;\r
 169                         bool GuidAttr = false;\r
 170                         UsageAttr = false;\r
 171 \r
 172                         bool DoCompares = true;\r
 173 \r
 174                         //\r
 175                         // If we are a certain special attribute, we\r
 176                         // set the information accordingly\r
 177                         //\r
 178                         \r
 179                         if (Type == TypeManager.attribute_usage_type)\r
 180                                 UsageAttr = true;\r
 181                         else if (Type == TypeManager.methodimpl_attr_type)\r
 182                                 MethodImplAttr = true;\r
 183                         else if (Type == TypeManager.marshal_as_attr_type)\r
 184                                 MarshalAsAttr = true;\r
 185                         else if (Type == TypeManager.guid_attr_type)\r
 186                                 GuidAttr = true;\r
 187                         else\r
 188                                 DoCompares = false;\r
 189 \r
 190                         // Now we extract the positional and named arguments\r
 191                         \r
 192                         ArrayList pos_args = new ArrayList ();\r
 193                         ArrayList named_args = new ArrayList ();\r
 194                         int pos_arg_count = 0;\r
 195                         \r
 196                         if (Arguments != null) {\r
 197                                 pos_args = (ArrayList) Arguments [0];\r
 198                                 if (pos_args != null)\r
 199                                         pos_arg_count = pos_args.Count;\r
 200                                 if (Arguments.Count > 1)\r
 201                                         named_args = (ArrayList) Arguments [1];\r
 202                         }\r
 203 \r
 204                         object [] pos_values = new object [pos_arg_count];\r
 205 \r
 206                         //\r
 207                         // First process positional arguments \r
 208                         //\r
 209 \r
 210                         int i;\r
 211                         for (i = 0; i < pos_arg_count; i++) {\r
 212                                 Argument a = (Argument) pos_args [i];\r
 213                                 Expression e;\r
 214 \r
 215                                 if (!a.Resolve (ec, Location))\r
 216                                         return null;\r
 217 \r
 218                                 e = a.Expr;\r
 219 \r
 220                                 object val;\r
 221                                 if (!GetAttributeArgumentExpression (e, Location, out val))\r
 222                                         return null;\r
 223                                 \r
 224                                 pos_values [i] = val;\r
 225                                 if (DoCompares){\r
 226                                         if (UsageAttr)\r
 227                                                 this.Targets = (AttributeTargets) pos_values [0];\r
 228                                         else if (MethodImplAttr)\r
 229                                                 this.ImplOptions = (MethodImplOptions) pos_values [0];\r
 230                                         else if (GuidAttr){\r
 231                                                 //\r
 232                                                 // we will later check the validity of the type\r
 233                                                 //\r
 234                                                 if (pos_values [0] is string){\r
 235                                                         if (!ValidateGuid ((string) pos_values [0]))\r
 236                                                                 return null;\r
 237                                                 }\r
 238                                                 \r
 239                                         } else if (MarshalAsAttr)\r
 240                                                 this.UnmanagedType =\r
 241                                                 (System.Runtime.InteropServices.UnmanagedType) pos_values [0];\r
 242                                 }\r
 243                         }\r
 244 \r
 245                         //\r
 246                         // Now process named arguments\r
 247                         //\r
 248 \r
 249                         ArrayList field_infos = null;\r
 250                         ArrayList prop_infos  = null;\r
 251                         ArrayList field_values = null;\r
 252                         ArrayList prop_values = null;\r
 253 \r
 254                         if (named_args.Count > 0) {\r
 255                                 field_infos = new ArrayList ();\r
 256                                 prop_infos  = new ArrayList ();\r
 257                                 field_values = new ArrayList ();\r
 258                                 prop_values = new ArrayList ();\r
 259                         }\r
 260                         \r
 261                         for (i = 0; i < named_args.Count; i++) {\r
 262                                 DictionaryEntry de = (DictionaryEntry) named_args [i];\r
 263                                 string member_name = (string) de.Key;\r
 264                                 Argument a  = (Argument) de.Value;\r
 265                                 Expression e;\r
 266                                 \r
 267                                 if (!a.Resolve (ec, Location))\r
 268                                         return null;\r
 269 \r
 270                                 Expression member = Expression.MemberLookup (\r
 271                                         ec, Type, member_name,\r
 272                                         MemberTypes.Field | MemberTypes.Property,\r
 273                                         BindingFlags.Public | BindingFlags.Instance,\r
 274                                         Location);\r
 275 \r
 276                                 if (member == null || !(member is PropertyExpr || member is FieldExpr)) {\r
 277                                         Error_InvalidNamedArgument (member_name);\r
 278                                         return null;\r
 279                                 }\r
 280 \r
 281                                 e = a.Expr;\r
 282                                 if (member is PropertyExpr) {\r
 283                                         PropertyExpr pe = (PropertyExpr) member;\r
 284                                         PropertyInfo pi = pe.PropertyInfo;\r
 285 \r
 286                                         if (!pi.CanWrite) {\r
 287                                                 Error_InvalidNamedArgument (member_name);\r
 288                                                 return null;\r
 289                                         }\r
 290 \r
 291                                         if (e is Constant) {\r
 292                                                 object o = ((Constant) e).GetValue ();\r
 293                                                 prop_values.Add (o);\r
 294                                                 \r
 295                                                 if (UsageAttr) {\r
 296                                                         if (member_name == "AllowMultiple")\r
 297                                                                 this.AllowMultiple = (bool) o;\r
 298                                                         if (member_name == "Inherited")\r
 299                                                                 this.Inherited = (bool) o;\r
 300                                                 }\r
 301                                                 \r
 302                                         } else if (e is TypeOf) {\r
 303                                                 prop_values.Add (((TypeOf) e).TypeArg);\r
 304                                         } else if (e is ArrayCreation) {\r
 305                                                 prop_values.Add (((ArrayCreation) e).EncodeAsAttribute());\r
 306                                         } else {\r
 307                                                 Error_AttributeArgumentNotValid (Location);\r
 308                                                 return null;\r
 309                                         }\r
 310                                         \r
 311                                         prop_infos.Add (pi);\r
 312                                         \r
 313                                 } else if (member is FieldExpr) {\r
 314                                         FieldExpr fe = (FieldExpr) member;\r
 315                                         FieldInfo fi = fe.FieldInfo;\r
 316 \r
 317                                         if (fi.IsInitOnly) {\r
 318                                                 Error_InvalidNamedArgument (member_name);\r
 319                                                 return null;\r
 320                                         }\r
 321 \r
 322                                         //\r
 323                                         // Handle charset here, and set the TypeAttributes\r
 324                                         \r
 325                                         if (e is Constant){\r
 326                                                 object value = ((Constant) e).GetValue ();\r
 327                                                 \r
 328                                                 field_values.Add (value);\r
 329                                         } else if (e is TypeOf) {\r
 330                                                 field_values.Add (((TypeOf) e).TypeArg);\r
 331                                         } else {\r
 332                                                 Error_AttributeArgumentNotValid (Location);\r
 333                                                 return null;\r
 334                                         }\r
 335                                         \r
 336                                         field_infos.Add (fi);\r
 337                                 }\r
 338                         }\r
 339 \r
 340                         Expression mg = Expression.MemberLookup (\r
 341                                 ec, Type, ".ctor", MemberTypes.Constructor,\r
 342                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,\r
 343                                 Location);\r
 344 \r
 345                         if (mg == null) {\r
 346                                 Error_AttributeConstructorMismatch (Location);\r
 347                                 return null;\r
 348                         }\r
 349 \r
 350                         MethodBase constructor = Invocation.OverloadResolve (\r
 351                                 ec, (MethodGroupExpr) mg, pos_args, Location);\r
 352 \r
 353                         if (constructor == null) {\r
 354                                 Error_AttributeConstructorMismatch (Location);\r
 355                                 return null;\r
 356                         }\r
 357 \r
 358                         //\r
 359                         // Now we perform some checks on the positional args as they\r
 360                         // cannot be null for a constructor which expects a parameter\r
 361                         // of type object\r
 362                         //\r
 363 \r
 364                         ParameterData pd = Invocation.GetParameterData (constructor);\r
 365 \r
 366                         int group_in_params_array = Int32.MaxValue;\r
 367                         int pc = pd.Count;\r
 368                         if (pc > 0 && pd.ParameterModifier (pc-1) == Parameter.Modifier.PARAMS)\r
 369                                 group_in_params_array = pc-1;\r
 370                         \r
 371                         for (int j = 0; j < pos_arg_count; ++j) {\r
 372                                 Argument a = (Argument) pos_args [j];\r
 373                                 \r
 374                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {\r
 375                                         Error_AttributeArgumentNotValid (Location);\r
 376                                         return null;\r
 377                                 }\r
 378 \r
 379                                 if (j < group_in_params_array)\r
 380                                         continue;\r
 381                                 \r
 382                                 if (j == group_in_params_array){\r
 383                                         object v = pos_values [j];\r
 384                                         int count = pos_arg_count - j;\r
 385 \r
 386                                         object [] array = new object [count];\r
 387                                         pos_values [j] = array;\r
 388                                         array [0] = v;\r
 389                                 } else {\r
 390                                         object [] array = (object []) pos_values [group_in_params_array];\r
 391 \r
 392                                         array [j - group_in_params_array] = pos_values [j];\r
 393                                 }\r
 394                         }\r
 395 \r
 396                         //\r
 397                         // Adjust the size of the pos_values if it had params\r
 398                         //\r
 399                         if (group_in_params_array != Int32.MaxValue){\r
 400                                 int argc = group_in_params_array+1;\r
 401                                 object [] new_pos_values = new object [argc];\r
 402 \r
 403                                 for (int p = 0; p < argc; p++)\r
 404                                         new_pos_values [p] = pos_values [p];\r
 405                                 pos_values = new_pos_values;\r
 406                         }\r
 407 \r
 408                         try {\r
 409                                 if (named_args.Count > 0) {\r
 410                                         prop_info_arr = new PropertyInfo [prop_infos.Count];\r
 411                                         field_info_arr = new FieldInfo [field_infos.Count];\r
 412                                         field_values_arr = new object [field_values.Count];\r
 413                                         prop_values_arr = new object [prop_values.Count];\r
 414 \r
 415                                         field_infos.CopyTo  (field_info_arr, 0);\r
 416                                         field_values.CopyTo (field_values_arr, 0);\r
 417 \r
 418                                         prop_values.CopyTo  (prop_values_arr, 0);\r
 419                                         prop_infos.CopyTo   (prop_info_arr, 0);\r
 420 \r
 421                                         cb = new CustomAttributeBuilder (\r
 422                                                 (ConstructorInfo) constructor, pos_values,\r
 423                                                 prop_info_arr, prop_values_arr,\r
 424                                                 field_info_arr, field_values_arr);\r
 425                                 }\r
 426                                 else\r
 427                                         cb = new CustomAttributeBuilder (\r
 428                                                 (ConstructorInfo) constructor, pos_values);\r
 429                         } catch (NullReferenceException) {\r
 430                                 // \r
 431                                 // Don't know what to do here\r
 432                                 //\r
 433                                 Report.Warning (\r
 434                                         -101, Location, "NullReferenceException while trying to create attribute." +\r
 435                                         "Something's wrong!");\r
 436                         } catch (Exception e) {\r
 437                                 //\r
 438                                 // Sample:\r
 439                                 // using System.ComponentModel;\r
 440                                 // [DefaultValue (CollectionChangeAction.Add)]\r
 441                                 // class X { static void Main () {} }\r
 442                                 //\r
 443                                 Report.Warning (\r
 444                                         -23, Location,\r
 445                                         "The compiler can not encode this attribute in .NET due to\n" +\r
 446                                         "\ta bug in the .NET runtime.  Try the Mono runtime.\nThe error was: " + e.Message);\r
 447                         }\r
 448                         \r
 449                         return cb;\r
 450                 }\r
 451 \r
 452                 /// <summary>\r
 453                 ///   Get a string containing a list of valid targets for the attribute 'attr'\r
 454                 /// </summary>\r
 455                 static string GetValidTargets (Attribute attr)\r
 456                 {\r
 457                         StringBuilder sb = new StringBuilder ();\r
 458                         AttributeTargets targets = 0;\r
 459                         \r
 460                         TypeContainer a = TypeManager.LookupAttr (attr.Type);\r
 461 \r
 462                         if (a == null) {\r
 463                                 \r
 464                                 System.Attribute [] attrs = null;\r
 465                                 \r
 466                                 try {\r
 467                                         attrs = System.Attribute.GetCustomAttributes (attr.Type);\r
 468                                         \r
 469                                 } catch {\r
 470                                         Report.Error (-20, attr.Location, "Cannot find attribute type " + attr.Name +\r
 471                                                       " (maybe you forgot to set the usage using the" +\r
 472                                                       " AttributeUsage attribute ?).");\r
 473                                         return null;\r
 474                                 }\r
 475                                         \r
 476                                 foreach (System.Attribute tmp in attrs)\r
 477                                         if (tmp is AttributeUsageAttribute) {\r
 478                                                 targets = ((AttributeUsageAttribute) tmp).ValidOn;\r
 479                                                 break;\r
 480                                         }\r
 481                         } else\r
 482                                 targets = a.Targets;\r
 483 \r
 484                         \r
 485                         if ((targets & AttributeTargets.Assembly) != 0)\r
 486                                 sb.Append ("'assembly' ");\r
 487 \r
 488                         if ((targets & AttributeTargets.Class) != 0)\r
 489                                 sb.Append ("'class' ");\r
 490 \r
 491                         if ((targets & AttributeTargets.Constructor) != 0)\r
 492                                 sb.Append ("'constructor' ");\r
 493 \r
 494                         if ((targets & AttributeTargets.Delegate) != 0)\r
 495                                 sb.Append ("'delegate' ");\r
 496 \r
 497                         if ((targets & AttributeTargets.Enum) != 0)\r
 498                                 sb.Append ("'enum' ");\r
 499 \r
 500                         if ((targets & AttributeTargets.Event) != 0)\r
 501                                 sb.Append ("'event' ");\r
 502 \r
 503                         if ((targets & AttributeTargets.Field) != 0)\r
 504                                 sb.Append ("'field' ");\r
 505 \r
 506                         if ((targets & AttributeTargets.Interface) != 0)\r
 507                                 sb.Append ("'interface' ");\r
 508 \r
 509                         if ((targets & AttributeTargets.Method) != 0)\r
 510                                 sb.Append ("'method' ");\r
 511 \r
 512                         if ((targets & AttributeTargets.Module) != 0)\r
 513                                 sb.Append ("'module' ");\r
 514 \r
 515                         if ((targets & AttributeTargets.Parameter) != 0)\r
 516                                 sb.Append ("'parameter' ");\r
 517 \r
 518                         if ((targets & AttributeTargets.Property) != 0)\r
 519                                 sb.Append ("'property' ");\r
 520 \r
 521                         if ((targets & AttributeTargets.ReturnValue) != 0)\r
 522                                 sb.Append ("'return value' ");\r
 523 \r
 524                         if ((targets & AttributeTargets.Struct) != 0)\r
 525                                 sb.Append ("'struct' ");\r
 526 \r
 527                         return sb.ToString ();\r
 528 \r
 529                 }\r
 530 \r
 531                 public static void Error_AttributeNotValidForElement (Attribute a, Location loc)\r
 532                 {\r
 533                         Report.Error (\r
 534                                 592, loc, "Attribute '" + a.Name +\r
 535                                 "' is not valid on this declaration type. " +\r
 536                                 "It is valid on " + GetValidTargets (a) + "declarations only.");\r
 537                 }\r
 538 \r
 539                 /// <summary>\r
 540                 ///   Ensure that Attribute 'a' is being applied to the right language element (target)\r
 541                 /// </summary>\r
 542                 public static bool CheckAttributeTarget (Attribute a, object element)\r
 543                 {\r
 544                         TypeContainer attr = TypeManager.LookupAttr (a.Type);\r
 545                         AttributeTargets targets = 0;\r
 546 \r
 547                         if (attr == null) {\r
 548                                 System.Attribute [] attrs = null;\r
 549                                 \r
 550                                 try {\r
 551                                         attrs = System.Attribute.GetCustomAttributes (a.Type);\r
 552 \r
 553                                 } catch {\r
 554                                         Report.Error (-20, a.Location, "Cannot find attribute type " + a.Name +\r
 555                                                       " (maybe you forgot to set the usage using the" +\r
 556                                                       " AttributeUsage attribute ?).");\r
 557                                         return false;\r
 558                                 }\r
 559                                         \r
 560                                 foreach (System.Attribute tmp in attrs)\r
 561                                         if (tmp is AttributeUsageAttribute) { \r
 562                                                 targets = ((AttributeUsageAttribute) tmp).ValidOn;\r
 563                                                 break;\r
 564                                         }\r
 565                         } else\r
 566                                 targets = attr.Targets;\r
 567 \r
 568 \r
 569                         if (element is Class) {\r
 570                                 if ((targets & AttributeTargets.Class) != 0)\r
 571                                         return true;\r
 572                                 else\r
 573                                         return false;\r
 574                                 \r
 575                         } else if (element is Struct) {\r
 576                                 if ((targets & AttributeTargets.Struct) != 0)\r
 577                                         return true;\r
 578                                 else\r
 579                                         return false;\r
 580                         } else if (element is Constructor) {\r
 581                                 if ((targets & AttributeTargets.Constructor) != 0)\r
 582                                         return true;\r
 583                                 else\r
 584                                         return false;\r
 585                         } else if (element is Delegate) {\r
 586                                 if ((targets & AttributeTargets.Delegate) != 0)\r
 587                                         return true;\r
 588                                 else\r
 589                                         return false;\r
 590                         } else if (element is Enum) {\r
 591                                 if ((targets & AttributeTargets.Enum) != 0)\r
 592                                         return true;\r
 593                                 else\r
 594                                         return false;\r
 595                         } else if (element is Event || element is InterfaceEvent) {\r
 596                                 if ((targets & AttributeTargets.Event) != 0)\r
 597                                         return true;\r
 598                                 else\r
 599                                         return false;\r
 600                         } else if (element is Field || element is FieldBuilder) {\r
 601                                 if ((targets & AttributeTargets.Field) != 0)\r
 602                                         return true;\r
 603                                 else\r
 604                                         return false;\r
 605                         } else if (element is Interface) {\r
 606                                 if ((targets & AttributeTargets.Interface) != 0)\r
 607                                         return true;\r
 608                                 else\r
 609                                         return false;\r
 610                         } else if (element is Method || element is Operator ||\r
 611                                    element is InterfaceMethod || element is Accessor) {\r
 612                                 if ((targets & AttributeTargets.Method) != 0)\r
 613                                         return true;\r
 614                                 else\r
 615                                         return false;\r
 616                         } else if (element is ParameterBuilder) {\r
 617                                 if ((targets & AttributeTargets.Parameter) != 0 ||\r
 618                                     (targets & AttributeTargets.ReturnValue) != 0)\r
 619                                         return true;\r
 620                                 else\r
 621                                         return false;\r
 622                         } else if (element is Property || element is Indexer ||\r
 623                                    element is InterfaceProperty || element is InterfaceIndexer) {\r
 624                                 if ((targets & AttributeTargets.Property) != 0)\r
 625                                         return true;\r
 626                                 else\r
 627                                         return false;\r
 628                         } else if (element is AssemblyBuilder){\r
 629                                 if ((targets & AttributeTargets.Assembly) != 0)\r
 630                                         return true;\r
 631                                 else\r
 632                                         return false;\r
 633                         }\r
 634 \r
 635                         return false;\r
 636                 }\r
 637 \r
 638                 //\r
 639                 // This method should be invoked to pull the IndexerName attribute from an\r
 640                 // Indexer if it exists.\r
 641                 //\r
 642                 public static string ScanForIndexerName (EmitContext ec, Attributes opt_attrs)\r
 643                 {\r
 644                         if (opt_attrs == null)\r
 645                                 return null;\r
 646                         if (opt_attrs.AttributeSections == null)\r
 647                                 return null;\r
 648 \r
 649                         foreach (AttributeSection asec in opt_attrs.AttributeSections) {\r
 650                                 if (asec.Attributes == null)\r
 651                                         continue;\r
 652 \r
 653                                 foreach (Attribute a in asec.Attributes){\r
 654                                         if (a.ResolveType (ec) == null)\r
 655                                                 return null;\r
 656                                         \r
 657                                         if (a.Type != TypeManager.indexer_name_type)\r
 658                                                 continue;\r
 659 \r
 660                                         //\r
 661                                         // So we have found an IndexerName, pull the data out.\r
 662                                         //\r
 663                                         if (a.Arguments == null || a.Arguments [0] == null){\r
 664                                                 Error_AttributeConstructorMismatch (a.Location);\r
 665                                                 return null;\r
 666                                         }\r
 667                                         ArrayList pos_args = (ArrayList) a.Arguments [0];\r
 668                                         if (pos_args.Count == 0){\r
 669                                                 Error_AttributeConstructorMismatch (a.Location);\r
 670                                                 return null;\r
 671                                         }\r
 672                                         \r
 673                                         Argument arg = (Argument) pos_args [0];\r
 674                                         if (!arg.Resolve (ec, a.Location))\r
 675                                                 return null;\r
 676                                         \r
 677                                         Expression e = arg.Expr;\r
 678                                         if (!(e is StringConstant)){\r
 679                                                 Error_AttributeConstructorMismatch (a.Location);\r
 680                                                 return null;\r
 681                                         }\r
 682 \r
 683                                         //\r
 684                                         // Remove the attribute from the list\r
 685                                         //\r
 686                                         asec.Attributes.Remove (a);\r
 687 \r
 688                                         return (((StringConstant) e).Value);\r
 689                                 }\r
 690                         }\r
 691                         return null;\r
 692                 }\r
 693 \r
 694                 //\r
 695                 // This pulls the condition name out of a Conditional attribute\r
 696                 //\r
 697                 public string Conditional_GetConditionName ()\r
 698                 {\r
 699                         //\r
 700                         // So we have a Conditional, pull the data out.\r
 701                         //\r
 702                         if (Arguments == null || Arguments [0] == null){\r
 703                                 Error_AttributeConstructorMismatch (Location);\r
 704                                 return null;\r
 705                         }\r
 706 \r
 707                         ArrayList pos_args = (ArrayList) Arguments [0];\r
 708                         if (pos_args.Count != 1){\r
 709                                 Error_AttributeConstructorMismatch (Location);\r
 710                                 return null;\r
 711                         }\r
 712 \r
 713                         Argument arg = (Argument) pos_args [0]; \r
 714                         if (!(arg.Expr is StringConstant)){\r
 715                                 Error_AttributeConstructorMismatch (Location);\r
 716                                 return null;\r
 717                         }\r
 718 \r
 719                         return ((StringConstant) arg.Expr).Value;\r
 720                 }\r
 721 \r
 722                 //\r
 723                 // This pulls the obsolete message and error flag out of an Obsolete attribute\r
 724                 //\r
 725                 public string Obsolete_GetObsoleteMessage (out bool is_error)\r
 726                 {\r
 727                         is_error = false;\r
 728                         //\r
 729                         // So we have an Obsolete, pull the data out.\r
 730                         //\r
 731                         if (Arguments == null || Arguments [0] == null)\r
 732                                 return "";\r
 733 \r
 734                         ArrayList pos_args = (ArrayList) Arguments [0];\r
 735                         if (pos_args.Count == 0)\r
 736                                 return "";\r
 737                         else if (pos_args.Count > 2){\r
 738                                 Error_AttributeConstructorMismatch (Location);\r
 739                                 return null;\r
 740                         }\r
 741 \r
 742                         Argument arg = (Argument) pos_args [0]; \r
 743                         if (!(arg.Expr is StringConstant)){\r
 744                                 Error_AttributeConstructorMismatch (Location);\r
 745                                 return null;\r
 746                         }\r
 747 \r
 748                         if (pos_args.Count == 2){\r
 749                                 Argument arg2 = (Argument) pos_args [1];\r
 750                                 if (!(arg2.Expr is BoolConstant)){\r
 751                                         Error_AttributeConstructorMismatch (Location);\r
 752                                         return null;\r
 753                                 }\r
 754                                 is_error = ((BoolConstant) arg2.Expr).Value;\r
 755                         }\r
 756 \r
 757                         return ((StringConstant) arg.Expr).Value;\r
 758                 }\r
 759 \r
 760                 static object GetFieldValue (Attribute a, string name)\r
 761                 {\r
 762                         int i;\r
 763                         if (a.field_info_arr == null)\r
 764                                 return null;\r
 765                         i = 0;\r
 766                         foreach (FieldInfo fi in a.field_info_arr) {\r
 767                                 if (fi.Name == name)\r
 768                                         return a.field_values_arr [i];\r
 769                                 i++;\r
 770                         }\r
 771                         return null;\r
 772                 }\r
 773 \r
 774                 static UnmanagedMarshal GetMarshal (Attribute a)\r
 775                 {
 776                         object o = GetFieldValue (a, "ArraySubType");
 777                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;
 778
 779                         switch (a.UnmanagedType) {
 780                         case UnmanagedType.CustomMarshaler:
 781                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",
 782                                                                        BindingFlags.Static | BindingFlags.Public);
 783                                 if (define_custom == null)
 784                                         return null;
 785
 786                                 object [] args = new object [4];
 787                                 args [0] = GetFieldValue (a, "MarshalTypeRef");
 788                                 args [1] = GetFieldValue (a, "MarshalCookie");
 789                                 args [2] = GetFieldValue (a, "MarshalType");
 790                                 args [3] = Guid.Empty;
 791                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);
 792
 793                         case UnmanagedType.LPArray:
 794                                 return UnmanagedMarshal.DefineLPArray (array_sub_type);
 795
 796                         case UnmanagedType.SafeArray:
 797                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);
 798
 799                         case UnmanagedType.ByValArray:
 800                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue (a, "SizeConst"));
 801
 802                         case UnmanagedType.ByValTStr:
 803                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue (a, "SizeConst"));
 804
 805                         default:
 806                                 return UnmanagedMarshal.DefineUnmanagedMarshal (a.UnmanagedType);
 807                         }\r
 808                 }\r
 809 \r
 810                 /// <summary>\r
 811                 ///   Applies the attributes specified on target 'kind' to the `builder'.\r
 812                 /// </summary>\r
 813                 public static void ApplyAttributes (EmitContext ec, object builder, object kind,\r
 814                                                     Attributes opt_attrs)\r
 815                 {\r
 816                         Type attr_type = null;\r
 817                         \r
 818                         if (opt_attrs == null)\r
 819                                 return;\r
 820                         if (opt_attrs.AttributeSections == null)\r
 821                                 return;\r
 822 \r
 823                         ArrayList emitted_attrs = new ArrayList ();\r
 824                         ArrayList emitted_targets = new ArrayList ();\r
 825 \r
 826                         foreach (AttributeSection asec in opt_attrs.AttributeSections) {\r
 827                                 string attr_target = asec.Target;\r
 828                                 \r
 829                                 if (asec.Attributes == null)\r
 830                                         continue;\r
 831 \r
 832                                 if (attr_target == "assembly" && !(builder is AssemblyBuilder))\r
 833                                         continue;\r
 834 \r
 835                                 if (attr_target == "return" && !(builder is ParameterBuilder))\r
 836                                         continue;\r
 837                                 \r
 838                                 foreach (Attribute a in asec.Attributes) {\r
 839                                         Location loc = a.Location;\r
 840                                         CustomAttributeBuilder cb = a.Resolve (ec);\r
 841                                         attr_type = a.Type;\r
 842 \r
 843                                         if (cb == null) \r
 844                                                 continue;\r
 845                                         \r
 846                                         if (!(kind is TypeContainer))\r
 847                                                 if (!CheckAttributeTarget (a, kind)) {\r
 848                                                         Error_AttributeNotValidForElement (a, loc);\r
 849                                                         return;\r
 850                                                 }\r
 851 \r
 852                                         //\r
 853                                         // Perform the check for duplicate attributes\r
 854                                         //\r
 855                                         if (emitted_attrs.Contains (attr_type) &&\r
 856                                             emitted_targets.Contains (attr_target) &&\r
 857                                             !TypeManager.AreMultipleAllowed (attr_type)) {\r
 858                                                 Report.Error (579, loc, "Duplicate '" + a.Name + "' attribute");\r
 859                                                 return;\r
 860                                         }\r
 861 \r
 862                                         if (kind is Method || kind is Operator || kind is InterfaceMethod ||\r
 863                                             kind is Accessor) {\r
 864                                                 if (attr_type == TypeManager.methodimpl_attr_type) {\r
 865                                                         if (a.ImplOptions == MethodImplOptions.InternalCall)\r
 866                                                                 ((MethodBuilder) builder).\r
 867                                                                 SetImplementationFlags (\r
 868                                                                         MethodImplAttributes.InternalCall |\r
 869                                                                         MethodImplAttributes.Runtime);\r
 870                                                         else\r
 871                                                                 ((MethodBuilder) builder).SetCustomAttribute (cb);\r
 872                                                 } else if (attr_type != TypeManager.dllimport_type){\r
 873                                                         ((MethodBuilder) builder).SetCustomAttribute (cb);\r
 874                                                 }\r
 875                                         } else if (kind is Constructor) {\r
 876                                                 ((ConstructorBuilder) builder).SetCustomAttribute (cb);\r
 877                                         } else if (kind is Field) {
 878                                                 if (attr_type == TypeManager.marshal_as_attr_type) {
 879                                                         UnmanagedMarshal marshal = GetMarshal (a);
 880                                                         if (marshal == null) {
 881                                                                 Report.Warning (-24, loc,
 882                                                                         "The Microsoft Runtime cannot set this marshal info. " +
 883                                                                         "Please use the Mono runtime instead.");
 884                                                         } else {
 885                                                                 ((FieldBuilder) builder).SetMarshal (marshal);
 886                                                         }
 887                                                 } else { \r
 888                                                         ((FieldBuilder) builder).SetCustomAttribute (cb);
 889                                                 }\r
 890                                         } else if (kind is Property || kind is Indexer ||\r
 891                                                    kind is InterfaceProperty || kind is InterfaceIndexer) {\r
 892                                                 ((PropertyBuilder) builder).SetCustomAttribute (cb);\r
 893                                         } else if (kind is Event || kind is InterfaceEvent) {\r
 894                                                 ((MyEventBuilder) builder).SetCustomAttribute (cb);\r
 895                                         } else if (kind is ParameterBuilder) {\r
 896 \r
 897                                                 if (attr_type == TypeManager.marshal_as_attr_type) {\r
 898                                                         UnmanagedMarshal marshal = GetMarshal (a);\r
 899                                                         if (marshal == null) {\r
 900                                                                 Report.Warning (-24, loc,\r
 901                                                                         "The Microsoft Runtime cannot set this marshal info. " +\r
 902                                                                         "Please use the Mono runtime instead.");\r
 903                                                         } else {\r
 904                                                                 ((ParameterBuilder) builder).SetMarshal (marshal);\r
 905                                                         }\r
 906                                                 } else { \r
 907 \r
 908                                                         try {\r
 909                                                                 ((ParameterBuilder) builder).SetCustomAttribute (cb);\r
 910                                                         } catch (System.ArgumentException) {\r
 911                                                                 Report.Warning (-24, loc,\r
 912                                                                                 "The Microsoft Runtime cannot set attributes \n" +\r
 913                                                                                 "on the return type of a method. Please use the \n" +\r
 914                                                                                 "Mono runtime instead.");\r
 915                                                         }\r
 916 \r
 917                                                 }\r
 918                                         } else if (kind is Enum) {\r
 919                                                 ((TypeBuilder) builder).SetCustomAttribute (cb); \r
 920 \r
 921                                         } else if (kind is TypeContainer) {\r
 922                                                 TypeContainer tc = (TypeContainer) kind;\r
 923                                                 \r
 924                                                 if (a.UsageAttr) {\r
 925                                                         tc.Targets = a.Targets;\r
 926                                                         tc.AllowMultiple = a.AllowMultiple;\r
 927                                                         tc.Inherited = a.Inherited;\r
 928 \r
 929                                                         TypeManager.RegisterAttributeAllowMultiple (tc.TypeBuilder,\r
 930                                                                                                     tc.AllowMultiple);\r
 931                                                         \r
 932                                                 } else if (attr_type == TypeManager.default_member_type) {\r
 933                                                         if (tc.Indexers != null) {\r
 934                                                                 Report.Error (646, loc,\r
 935                                                                       "Cannot specify the DefaultMember attribute on" +\r
 936                                                                       " a type containing an indexer");\r
 937                                                                 return;\r
 938                                                         }\r
 939 \r
 940                                                 } else {\r
 941                                                         if (!CheckAttributeTarget (a, kind)) {\r
 942                                                                 Error_AttributeNotValidForElement (a, loc);\r
 943                                                                 return;\r
 944                                                         }\r
 945                                                 }\r
 946 \r
 947                                                 try {\r
 948                                                         ((TypeBuilder) builder).SetCustomAttribute (cb);\r
 949                                                 } catch (System.ArgumentException) {\r
 950                                                         Report.Warning (\r
 951                                                                 -21, loc,\r
 952                                                 "The CharSet named property on StructLayout\n"+\r
 953                                                 "\tdoes not work correctly on Microsoft.NET\n"+\r
 954                                                 "\tYou might want to remove the CharSet declaration\n"+\r
 955                                                 "\tor compile using the Mono runtime instead of the\n"+\r
 956                                                 "\tMicrosoft .NET runtime");\r
 957                                                 }\r
 958                                         } else if (kind is Delegate){\r
 959                                                 if (!CheckAttributeTarget (a, kind)) {\r
 960                                                         Error_AttributeNotValidForElement (a, loc);\r
 961                                                         return;\r
 962                                                 }\r
 963                                                 try {\r
 964                                                         ((TypeBuilder) builder).SetCustomAttribute (cb);\r
 965                                                 } catch (System.ArgumentException) {\r
 966                                                         Report.Warning (\r
 967                                                                 -21, loc,\r
 968                                                 "The CharSet named property on StructLayout\n"+\r
 969                                                 "\tdoes not work correctly on Microsoft.NET\n"+\r
 970                                                 "\tYou might want to remove the CharSet declaration\n"+\r
 971                                                 "\tor compile using the Mono runtime instead of the\n"+\r
 972                                                 "\tMicrosoft .NET runtime");\r
 973                                                 }\r
 974                                         } else if (kind is Interface) {\r
 975                                                 Interface iface = (Interface) kind;\r
 976 \r
 977                                                 if ((attr_type == TypeManager.default_member_type) &&\r
 978                                                     (iface.InterfaceIndexers != null)) {\r
 979                                                         Report.Error (\r
 980                                                                 646, loc,\r
 981                                                                 "Cannot specify the DefaultMember attribute on" +\r
 982                                                                 " a type containing an indexer");\r
 983                                                         return;\r
 984                                                 }\r
 985 \r
 986                                                 if (!CheckAttributeTarget (a, kind)) {\r
 987                                                         Error_AttributeNotValidForElement (a, loc);\r
 988                                                         return;\r
 989                                                 }\r
 990 \r
 991                                                 ((TypeBuilder) builder).SetCustomAttribute (cb);\r
 992                                         } else if (kind is AssemblyBuilder){\r
 993                                                 ((AssemblyBuilder) builder).SetCustomAttribute (cb);\r
 994                                         } else if (kind is ModuleBuilder) {\r
 995                                                 ((ModuleBuilder) builder).SetCustomAttribute (cb);\r
 996                                         } else if (kind is FieldBuilder) {\r
 997                                                 if (attr_type == TypeManager.marshal_as_attr_type) {\r
 998                                                         UnmanagedMarshal marshal = GetMarshal (a);\r
 999                                                         if (marshal == null) {\r
1000                                                                 Report.Warning (-24, loc,\r
1001                                                                         "The Microsoft Runtime cannot set this marshal info. " +\r
1002                                                                         "Please use the Mono runtime instead.");\r
1003                                                         } else {\r
1004                                                                 ((ParameterBuilder) builder).SetMarshal (marshal);\r
1005                                                         }\r
1006                                                 } else { \r
1007                                                         ((FieldBuilder) builder).SetCustomAttribute (cb);\r
1008                                                 }\r
1009                                         } else\r
1010                                                 throw new Exception ("Unknown kind: " + kind);\r
1011 \r
1012                                         //\r
1013                                         // Once an attribute type has been emitted once we\r
1014                                         // keep track of the info to prevent multiple occurences\r
1015                                         // for attributes which do not explicitly allow it\r
1016                                         //\r
1017                                         if (!emitted_attrs.Contains (attr_type))\r
1018                                                 emitted_attrs.Add (attr_type);\r
1019 \r
1020                                         //\r
1021                                         // We keep of this target-wise and so emitted targets\r
1022                                         // are tracked too\r
1023                                         //\r
1024                                         if (!emitted_targets.Contains (attr_target))\r
1025                                                 emitted_targets.Add (attr_target);\r
1026                                 }\r
1027                                 \r
1028                                 \r
1029                         }\r
1030                 }\r
1031 \r
1032                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,\r
1033                                                           MethodAttributes flags, Type ret_type, Type [] param_types)\r
1034                 {\r
1035                         //\r
1036                         // We extract from the attribute the information we need \r
1037                         //\r
1038 \r
1039                         if (Arguments == null) {\r
1040                                 Console.WriteLine ("Internal error : this is not supposed to happen !");\r
1041                                 return null;\r
1042                         }\r
1043 \r
1044                         Type = CheckAttributeType (ec);\r
1045                         if (Type == null)\r
1046                                 return null;\r
1047                         \r
1048                         ArrayList named_args = new ArrayList ();\r
1049                         \r
1050                         ArrayList pos_args = (ArrayList) Arguments [0];\r
1051                         if (Arguments.Count > 1)\r
1052                                 named_args = (ArrayList) Arguments [1];\r
1053                         \r
1054 \r
1055                         string dll_name = null;\r
1056                         \r
1057                         Argument tmp = (Argument) pos_args [0];\r
1058 \r
1059                         if (!tmp.Resolve (ec, Location))\r
1060                                 return null;\r
1061                         \r
1062                         if (tmp.Expr is Constant)\r
1063                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();\r
1064                         else { \r
1065                                 Error_AttributeArgumentNotValid (Location);\r
1066                                 return null;\r
1067                         }\r
1068 \r
1069                         // Now we process the named arguments\r
1070                         CallingConvention cc = CallingConvention.Winapi;\r
1071                         CharSet charset = CharSet.Ansi;\r
1072                         bool preserve_sig = true;\r
1073 #if FIXME\r
1074                         bool exact_spelling = false;\r
1075 #endif\r
1076                         bool set_last_err = false;\r
1077                         string entry_point = null;\r
1078 \r
1079                         for (int i = 0; i < named_args.Count; i++) {\r
1080 \r
1081                                 DictionaryEntry de = (DictionaryEntry) named_args [i];\r
1082 \r
1083                                 string member_name = (string) de.Key;\r
1084                                 Argument a  = (Argument) de.Value;\r
1085 \r
1086                                 if (!a.Resolve (ec, Location))\r
1087                                         return null;\r
1088 \r
1089                                 Expression member = Expression.MemberLookup (\r
1090                                         ec, Type, member_name, \r
1091                                         MemberTypes.Field | MemberTypes.Property,\r
1092                                         BindingFlags.Public | BindingFlags.Instance,\r
1093                                         Location);\r
1094 \r
1095                                 if (member == null || !(member is FieldExpr)) {\r
1096                                         Error_InvalidNamedArgument (member_name);\r
1097                                         return null;\r
1098                                 }\r
1099 \r
1100                                 if (member is FieldExpr) {\r
1101                                         FieldExpr fe = (FieldExpr) member;\r
1102                                         FieldInfo fi = fe.FieldInfo;\r
1103 \r
1104                                         if (fi.IsInitOnly) {\r
1105                                                 Error_InvalidNamedArgument (member_name);\r
1106                                                 return null;\r
1107                                         }\r
1108 \r
1109                                         if (a.Expr is Constant) {\r
1110                                                 Constant c = (Constant) a.Expr;\r
1111                                                 \r
1112                                                 if (member_name == "CallingConvention")\r
1113                                                         cc = (CallingConvention) c.GetValue ();\r
1114                                                 else if (member_name == "CharSet")\r
1115                                                         charset = (CharSet) c.GetValue ();\r
1116                                                 else if (member_name == "EntryPoint")\r
1117                                                         entry_point = (string) c.GetValue ();\r
1118                                                 else if (member_name == "SetLastError")\r
1119                                                         set_last_err = (bool) c.GetValue ();\r
1120 #if FIXME\r
1121                                                 else if (member_name == "ExactSpelling")\r
1122                                                         exact_spelling = (bool) c.GetValue ();\r
1123 #endif\r
1124                                                 else if (member_name == "PreserveSig")\r
1125                                                         preserve_sig = (bool) c.GetValue ();\r
1126                                         } else { \r
1127                                                 Error_AttributeArgumentNotValid (Location);\r
1128                                                 return null;\r
1129                                         }\r
1130                                         \r
1131                                 }\r
1132                         }\r
1133 \r
1134                         if (entry_point == null)\r
1135                                 entry_point = name;\r
1136                         if (set_last_err)\r
1137                                 charset = (CharSet)((int)charset | 0x40);\r
1138                         \r
1139                         MethodBuilder mb = builder.DefinePInvokeMethod (\r
1140                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,\r
1141                                 CallingConventions.Standard,\r
1142                                 ret_type,\r
1143                                 param_types,\r
1144                                 cc,\r
1145                                 charset);\r
1146 \r
1147                         if (preserve_sig)\r
1148                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);\r
1149                         \r
1150                         return mb;\r
1151                 }\r
1152                 \r
1153         }\r
1154         \r
1155         public class AttributeSection {\r
1156                 public readonly string    Target;\r
1157                 public readonly ArrayList Attributes;\r
1158                 \r
1159                 public AttributeSection (string target, ArrayList attrs)\r
1160                 {\r
1161                         Target = target;\r
1162                         Attributes = attrs;\r
1163                 }\r
1164                 \r
1165         }\r
1166 \r
1167         public class Attributes {\r
1168                 public ArrayList AttributeSections;\r
1169 \r
1170                 public Attributes (AttributeSection a)\r
1171                 {\r
1172                         AttributeSections = new ArrayList ();\r
1173                         AttributeSections.Add (a);\r
1174 \r
1175                 }\r
1176 \r
1177                 public void AddAttributeSection (AttributeSection a)\r
1178                 {\r
1179                         if (a != null && !AttributeSections.Contains (a))\r
1180                                 AttributeSections.Add (a);\r
1181                 }\r
1182 \r
1183                 public bool Contains (Type t)\r
1184                 {\r
1185                         foreach (AttributeSection attr_section in AttributeSections){\r
1186                                 foreach (Attribute a in attr_section.Attributes){\r
1187                                         if (a.Type == t)\r
1188                                                 return true;\r
1189                                 }\r
1190                         }\r
1191                         \r
1192                         return false;\r
1193                 }\r
1194         }\r
1195 }\r