mcs/gmcs/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                 static void Error_TypeParameterInAttribute (Location loc)\r
  80                 {\r
  81                         Report.Error (\r
  82                                 -202, loc, "Can not use a type parameter in an attribute");\r
  83                 }\r
  84 \r
  85                 /// <summary>\r
  86                 ///   Tries to resolve the type of the attribute. Flags an error if it can't.\r
  87                 /// </summary>\r
  88                 private Type CheckAttributeType (EmitContext ec) {\r
  89                         Type t;\r
  90                         bool isattributeclass = true;\r
  91                         \r
  92                         t = RootContext.LookupType (ec.DeclSpace, Name, true, Location);\r
  93                         if (t != null) {\r
  94                                 isattributeclass = t.IsSubclassOf (TypeManager.attribute_type);\r
  95                                 if (isattributeclass)\r
  96                                         return t;\r
  97                         }\r
  98                         t = RootContext.LookupType (ec.DeclSpace, Name + "Attribute", true, Location);\r
  99                         if (t != null) {\r
 100                                 if (t.IsSubclassOf (TypeManager.attribute_type))\r
 101                                         return t;\r
 102                         }\r
 103                         if (!isattributeclass) {\r
 104                                 Report.Error (616, Location, "'" + Name + "': is not an attribute class");\r
 105                                 return null;\r
 106                         }\r
 107                         if (t != null) {\r
 108                                 Report.Error (616, Location, "'" + Name + "Attribute': is not an attribute class");\r
 109                                 return null;\r
 110                         }\r
 111                         Report.Error (\r
 112                                 246, Location, "Could not find attribute '" + Name + "' (are you" +\r
 113                                 " missing a using directive or an assembly reference ?)");\r
 114                         return null;\r
 115                 }\r
 116 \r
 117                 public Type ResolveType (EmitContext ec)\r
 118                 {\r
 119                         Type = CheckAttributeType (ec);\r
 120                         return Type;\r
 121                 }\r
 122 \r
 123                 /// <summary>\r
 124                 ///   Validates the guid string\r
 125                 /// </summary>\r
 126                 bool ValidateGuid (string guid)\r
 127                 {\r
 128                         try {\r
 129                                 new Guid (guid);\r
 130                                 return true;\r
 131                         } catch {\r
 132                                 Report.Error (647, Location, "Format of GUID is invalid: " + guid);\r
 133                                 return false;\r
 134                         }\r
 135                 }\r
 136 \r
 137                 //\r
 138                 // Given an expression, if the expression is a valid attribute-argument-expression\r
 139                 // returns an object that can be used to encode it, or null on failure.\r
 140                 //\r
 141                 public static bool GetAttributeArgumentExpression (Expression e, Location loc, out object result)\r
 142                 {\r
 143                         if (e is Constant) {\r
 144                                 result = ((Constant) e).GetValue ();\r
 145                                 return true;\r
 146                         } else if (e is TypeOf) {\r
 147                                 result = ((TypeOf) e).TypeArg;\r
 148                                 return true;\r
 149                         } else if (e is ArrayCreation){\r
 150                                 result =  ((ArrayCreation) e).EncodeAsAttribute ();\r
 151                                 if (result != null)\r
 152                                         return true;\r
 153                         } else if (e is EmptyCast) {\r
 154                                 result = e;\r
 155                                 if (((EmptyCast) e).Child is Constant) {\r
 156                                         result = ((Constant) ((EmptyCast)e).Child).GetValue();\r
 157                                 }\r
 158                                 return true;\r
 159                         }\r
 160 \r
 161                         result = null;\r
 162                         Error_AttributeArgumentNotValid (loc);\r
 163                         return false;\r
 164                 }\r
 165                 \r
 166                 public CustomAttributeBuilder Resolve (EmitContext ec)\r
 167                 {\r
 168                         if (Type == null)\r
 169                                 Type = CheckAttributeType (ec);\r
 170                         if (Type == null)\r
 171                                 return null;\r
 172 \r
 173                         bool MethodImplAttr = false;\r
 174                         bool MarshalAsAttr = false;\r
 175                         bool GuidAttr = false;\r
 176                         UsageAttr = false;\r
 177 \r
 178                         bool DoCompares = true;\r
 179 \r
 180                         //\r
 181                         // If we are a certain special attribute, we\r
 182                         // set the information accordingly\r
 183                         //\r
 184                         \r
 185                         if (Type == TypeManager.attribute_usage_type)\r
 186                                 UsageAttr = true;\r
 187                         else if (Type == TypeManager.methodimpl_attr_type)\r
 188                                 MethodImplAttr = true;\r
 189                         else if (Type == TypeManager.marshal_as_attr_type)\r
 190                                 MarshalAsAttr = true;\r
 191                         else if (Type == TypeManager.guid_attr_type)\r
 192                                 GuidAttr = true;\r
 193                         else\r
 194                                 DoCompares = false;\r
 195 \r
 196                         // Now we extract the positional and named arguments\r
 197                         \r
 198                         ArrayList pos_args = new ArrayList ();\r
 199                         ArrayList named_args = new ArrayList ();\r
 200                         int pos_arg_count = 0;\r
 201                         \r
 202                         if (Arguments != null) {\r
 203                                 pos_args = (ArrayList) Arguments [0];\r
 204                                 if (pos_args != null)\r
 205                                         pos_arg_count = pos_args.Count;\r
 206                                 if (Arguments.Count > 1)\r
 207                                         named_args = (ArrayList) Arguments [1];\r
 208                         }\r
 209 \r
 210                         object [] pos_values = new object [pos_arg_count];\r
 211 \r
 212                         //\r
 213                         // First process positional arguments \r
 214                         //\r
 215 \r
 216                         int i;\r
 217                         for (i = 0; i < pos_arg_count; i++) {\r
 218                                 Argument a = (Argument) pos_args [i];\r
 219                                 Expression e;\r
 220 \r
 221                                 if (!a.Resolve (ec, Location))\r
 222                                         return null;\r
 223 \r
 224                                 e = a.Expr;\r
 225 \r
 226                                 object val;\r
 227                                 if (!GetAttributeArgumentExpression (e, Location, out val))\r
 228                                         return null;\r
 229                                 \r
 230                                 pos_values [i] = val;\r
 231                                 if (DoCompares){\r
 232                                         if (UsageAttr)\r
 233                                                 this.Targets = (AttributeTargets) pos_values [0];\r
 234                                         else if (MethodImplAttr)\r
 235                                                 this.ImplOptions = (MethodImplOptions) pos_values [0];\r
 236                                         else if (GuidAttr){\r
 237                                                 //\r
 238                                                 // we will later check the validity of the type\r
 239                                                 //\r
 240                                                 if (pos_values [0] is string){\r
 241                                                         if (!ValidateGuid ((string) pos_values [0]))\r
 242                                                                 return null;\r
 243                                                 }\r
 244                                                 \r
 245                                         } else if (MarshalAsAttr)\r
 246                                                 this.UnmanagedType =\r
 247                                                 (System.Runtime.InteropServices.UnmanagedType) pos_values [0];\r
 248                                 }\r
 249                         }\r
 250 \r
 251                         //\r
 252                         // Now process named arguments\r
 253                         //\r
 254 \r
 255                         ArrayList field_infos = null;\r
 256                         ArrayList prop_infos  = null;\r
 257                         ArrayList field_values = null;\r
 258                         ArrayList prop_values = null;\r
 259 \r
 260                         if (named_args.Count > 0) {\r
 261                                 field_infos = new ArrayList ();\r
 262                                 prop_infos  = new ArrayList ();\r
 263                                 field_values = new ArrayList ();\r
 264                                 prop_values = new ArrayList ();\r
 265                         }\r
 266                         \r
 267                         for (i = 0; i < named_args.Count; i++) {\r
 268                                 DictionaryEntry de = (DictionaryEntry) named_args [i];\r
 269                                 string member_name = (string) de.Key;\r
 270                                 Argument a  = (Argument) de.Value;\r
 271                                 Expression e;\r
 272                                 \r
 273                                 if (!a.Resolve (ec, Location))\r
 274                                         return null;\r
 275 \r
 276                                 Expression member = Expression.MemberLookup (\r
 277                                         ec, Type, member_name,\r
 278                                         MemberTypes.Field | MemberTypes.Property,\r
 279                                         BindingFlags.Public | BindingFlags.Instance,\r
 280                                         Location);\r
 281 \r
 282                                 if (member == null || !(member is PropertyExpr || member is FieldExpr)) {\r
 283                                         Error_InvalidNamedArgument (member_name);\r
 284                                         return null;\r
 285                                 }\r
 286 \r
 287                                 e = a.Expr;\r
 288                                 if (e is TypeParameterExpr){\r
 289                                         Error_TypeParameterInAttribute (Location);\r
 290                                         return null;\r
 291                                 }\r
 292                                         \r
 293                                 if (member is PropertyExpr) {\r
 294                                         PropertyExpr pe = (PropertyExpr) member;\r
 295                                         PropertyInfo pi = pe.PropertyInfo;\r
 296 \r
 297                                         if (!pi.CanWrite) {\r
 298                                                 Error_InvalidNamedArgument (member_name);\r
 299                                                 return null;\r
 300                                         }\r
 301 \r
 302                                         if (e is Constant) {\r
 303                                                 object o = ((Constant) e).GetValue ();\r
 304                                                 prop_values.Add (o);\r
 305                                                 \r
 306                                                 if (UsageAttr) {\r
 307                                                         if (member_name == "AllowMultiple")\r
 308                                                                 this.AllowMultiple = (bool) o;\r
 309                                                         if (member_name == "Inherited")\r
 310                                                                 this.Inherited = (bool) o;\r
 311                                                 }\r
 312                                                 \r
 313                                         } else if (e is TypeOf) {\r
 314                                                 prop_values.Add (((TypeOf) e).TypeArg);\r
 315                                         } else if (e is ArrayCreation) {\r
 316                                                 prop_values.Add (((ArrayCreation) e).EncodeAsAttribute());\r
 317                                         } else {\r
 318                                                 Error_AttributeArgumentNotValid (Location);\r
 319                                                 return null;\r
 320                                         }\r
 321                                         \r
 322                                         prop_infos.Add (pi);\r
 323                                         \r
 324                                 } else if (member is FieldExpr) {\r
 325                                         FieldExpr fe = (FieldExpr) member;\r
 326                                         FieldInfo fi = fe.FieldInfo;\r
 327 \r
 328                                         if (fi.IsInitOnly) {\r
 329                                                 Error_InvalidNamedArgument (member_name);\r
 330                                                 return null;\r
 331                                         }\r
 332 \r
 333                                         //\r
 334                                         // Handle charset here, and set the TypeAttributes\r
 335                                         \r
 336                                         if (e is Constant){\r
 337                                                 object value = ((Constant) e).GetValue ();\r
 338                                                 \r
 339                                                 field_values.Add (value);\r
 340                                         } else if (e is TypeOf) {\r
 341                                                 field_values.Add (((TypeOf) e).TypeArg);\r
 342                                         } else {\r
 343                                                 Error_AttributeArgumentNotValid (Location);\r
 344                                                 return null;\r
 345                                         }\r
 346                                         \r
 347                                         field_infos.Add (fi);\r
 348                                 }\r
 349                         }\r
 350 \r
 351                         Expression mg = Expression.MemberLookup (\r
 352                                 ec, Type, ".ctor", MemberTypes.Constructor,\r
 353                                 BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly,\r
 354                                 Location);\r
 355 \r
 356                         if (mg == null) {\r
 357                                 Error_AttributeConstructorMismatch (Location);\r
 358                                 return null;\r
 359                         }\r
 360 \r
 361                         MethodBase constructor = Invocation.OverloadResolve (\r
 362                                 ec, (MethodGroupExpr) mg, pos_args, Location);\r
 363 \r
 364                         if (constructor == null) {\r
 365                                 Error_AttributeConstructorMismatch (Location);\r
 366                                 return null;\r
 367                         }\r
 368 \r
 369                         //\r
 370                         // Now we perform some checks on the positional args as they\r
 371                         // cannot be null for a constructor which expects a parameter\r
 372                         // of type object\r
 373                         //\r
 374 \r
 375                         ParameterData pd = Invocation.GetParameterData (constructor);\r
 376 \r
 377                         int group_in_params_array = Int32.MaxValue;\r
 378                         int pc = pd.Count;\r
 379                         if (pc > 0 && pd.ParameterModifier (pc-1) == Parameter.Modifier.PARAMS)\r
 380                                 group_in_params_array = pc-1;\r
 381                         \r
 382                         for (int j = 0; j < pos_arg_count; ++j) {\r
 383                                 Argument a = (Argument) pos_args [j];\r
 384                                 \r
 385                                 if (a.Expr is NullLiteral && pd.ParameterType (j) == TypeManager.object_type) {\r
 386                                         Error_AttributeArgumentNotValid (Location);\r
 387                                         return null;\r
 388                                 }\r
 389 \r
 390                                 if (j < group_in_params_array)\r
 391                                         continue;\r
 392                                 \r
 393                                 if (j == group_in_params_array){\r
 394                                         object v = pos_values [j];\r
 395                                         int count = pos_arg_count - j;\r
 396 \r
 397                                         object [] array = new object [count];\r
 398                                         pos_values [j] = array;\r
 399                                         array [0] = v;\r
 400                                 } else {\r
 401                                         object [] array = (object []) pos_values [group_in_params_array];\r
 402 \r
 403                                         array [j - group_in_params_array] = pos_values [j];\r
 404                                 }\r
 405                         }\r
 406 \r
 407                         //\r
 408                         // Adjust the size of the pos_values if it had params\r
 409                         //\r
 410                         if (group_in_params_array != Int32.MaxValue){\r
 411                                 int argc = group_in_params_array+1;\r
 412                                 object [] new_pos_values = new object [argc];\r
 413 \r
 414                                 for (int p = 0; p < argc; p++)\r
 415                                         new_pos_values [p] = pos_values [p];\r
 416                                 pos_values = new_pos_values;\r
 417                         }\r
 418 \r
 419                         try {\r
 420                                 if (named_args.Count > 0) {\r
 421                                         prop_info_arr = new PropertyInfo [prop_infos.Count];\r
 422                                         field_info_arr = new FieldInfo [field_infos.Count];\r
 423                                         field_values_arr = new object [field_values.Count];\r
 424                                         prop_values_arr = new object [prop_values.Count];\r
 425 \r
 426                                         field_infos.CopyTo  (field_info_arr, 0);\r
 427                                         field_values.CopyTo (field_values_arr, 0);\r
 428 \r
 429                                         prop_values.CopyTo  (prop_values_arr, 0);\r
 430                                         prop_infos.CopyTo   (prop_info_arr, 0);\r
 431 \r
 432                                         cb = new CustomAttributeBuilder (\r
 433                                                 (ConstructorInfo) constructor, pos_values,\r
 434                                                 prop_info_arr, prop_values_arr,\r
 435                                                 field_info_arr, field_values_arr);\r
 436                                 }\r
 437                                 else\r
 438                                         cb = new CustomAttributeBuilder (\r
 439                                                 (ConstructorInfo) constructor, pos_values);\r
 440                         } catch (NullReferenceException) {\r
 441                                 // \r
 442                                 // Don't know what to do here\r
 443                                 //\r
 444                                 Report.Warning (\r
 445                                         -101, Location, "NullReferenceException while trying to create attribute." +\r
 446                                         "Something's wrong!");\r
 447                         } catch (Exception e) {\r
 448                                 //\r
 449                                 // Sample:\r
 450                                 // using System.ComponentModel;\r
 451                                 // [DefaultValue (CollectionChangeAction.Add)]\r
 452                                 // class X { static void Main () {} }\r
 453                                 //\r
 454                                 Report.Warning (\r
 455                                         -23, Location,\r
 456                                         "The compiler can not encode this attribute in .NET due to\n" +\r
 457                                         "\ta bug in the .NET runtime.  Try the Mono runtime.\nThe error was: " + e.Message);\r
 458                         }\r
 459                         \r
 460                         return cb;\r
 461                 }\r
 462 \r
 463                 /// <summary>\r
 464                 ///   Get a string containing a list of valid targets for the attribute 'attr'\r
 465                 /// </summary>\r
 466                 static string GetValidTargets (Attribute attr)\r
 467                 {\r
 468                         StringBuilder sb = new StringBuilder ();\r
 469                         AttributeTargets targets = 0;\r
 470                         \r
 471                         TypeContainer a = TypeManager.LookupAttr (attr.Type);\r
 472 \r
 473                         if (a == null) {\r
 474                                 \r
 475                                 System.Attribute [] attrs = null;\r
 476                                 \r
 477                                 try {\r
 478                                         attrs = System.Attribute.GetCustomAttributes (attr.Type);\r
 479                                         \r
 480                                 } catch {\r
 481                                         Report.Error (-20, attr.Location, "Cannot find attribute type " + attr.Name +\r
 482                                                       " (maybe you forgot to set the usage using the" +\r
 483                                                       " AttributeUsage attribute ?).");\r
 484                                         return null;\r
 485                                 }\r
 486                                         \r
 487                                 foreach (System.Attribute tmp in attrs)\r
 488                                         if (tmp is AttributeUsageAttribute) {\r
 489                                                 targets = ((AttributeUsageAttribute) tmp).ValidOn;\r
 490                                                 break;\r
 491                                         }\r
 492                         } else\r
 493                                 targets = a.Targets;\r
 494 \r
 495                         \r
 496                         if ((targets & AttributeTargets.Assembly) != 0)\r
 497                                 sb.Append ("'assembly' ");\r
 498 \r
 499                         if ((targets & AttributeTargets.Class) != 0)\r
 500                                 sb.Append ("'class' ");\r
 501 \r
 502                         if ((targets & AttributeTargets.Constructor) != 0)\r
 503                                 sb.Append ("'constructor' ");\r
 504 \r
 505                         if ((targets & AttributeTargets.Delegate) != 0)\r
 506                                 sb.Append ("'delegate' ");\r
 507 \r
 508                         if ((targets & AttributeTargets.Enum) != 0)\r
 509                                 sb.Append ("'enum' ");\r
 510 \r
 511                         if ((targets & AttributeTargets.Event) != 0)\r
 512                                 sb.Append ("'event' ");\r
 513 \r
 514                         if ((targets & AttributeTargets.Field) != 0)\r
 515                                 sb.Append ("'field' ");\r
 516 \r
 517                         if ((targets & AttributeTargets.Interface) != 0)\r
 518                                 sb.Append ("'interface' ");\r
 519 \r
 520                         if ((targets & AttributeTargets.Method) != 0)\r
 521                                 sb.Append ("'method' ");\r
 522 \r
 523                         if ((targets & AttributeTargets.Module) != 0)\r
 524                                 sb.Append ("'module' ");\r
 525 \r
 526                         if ((targets & AttributeTargets.Parameter) != 0)\r
 527                                 sb.Append ("'parameter' ");\r
 528 \r
 529                         if ((targets & AttributeTargets.Property) != 0)\r
 530                                 sb.Append ("'property' ");\r
 531 \r
 532                         if ((targets & AttributeTargets.ReturnValue) != 0)\r
 533                                 sb.Append ("'return value' ");\r
 534 \r
 535                         if ((targets & AttributeTargets.Struct) != 0)\r
 536                                 sb.Append ("'struct' ");\r
 537 \r
 538                         return sb.ToString ();\r
 539 \r
 540                 }\r
 541 \r
 542                 public static void Error_AttributeNotValidForElement (Attribute a, Location loc)\r
 543                 {\r
 544                         Report.Error (\r
 545                                 592, loc, "Attribute '" + a.Name +\r
 546                                 "' is not valid on this declaration type. " +\r
 547                                 "It is valid on " + GetValidTargets (a) + "declarations only.");\r
 548                 }\r
 549 \r
 550                 /// <summary>\r
 551                 ///   Ensure that Attribute 'a' is being applied to the right language element (target)\r
 552                 /// </summary>\r
 553                 public static bool CheckAttributeTarget (Attribute a, object element)\r
 554                 {\r
 555                         TypeContainer attr = TypeManager.LookupAttr (a.Type);\r
 556                         AttributeTargets targets = 0;\r
 557 \r
 558                         if (attr == null) {\r
 559                                 System.Attribute [] attrs = null;\r
 560                                 \r
 561                                 try {\r
 562                                         attrs = System.Attribute.GetCustomAttributes (a.Type);\r
 563 \r
 564                                 } catch {\r
 565                                         Report.Error (-20, a.Location, "Cannot find attribute type " + a.Name +\r
 566                                                       " (maybe you forgot to set the usage using the" +\r
 567                                                       " AttributeUsage attribute ?).");\r
 568                                         return false;\r
 569                                 }\r
 570                                         \r
 571                                 foreach (System.Attribute tmp in attrs)\r
 572                                         if (tmp is AttributeUsageAttribute) { \r
 573                                                 targets = ((AttributeUsageAttribute) tmp).ValidOn;\r
 574                                                 break;\r
 575                                         }\r
 576                         } else\r
 577                                 targets = attr.Targets;\r
 578 \r
 579 \r
 580                         if (element is Class) {\r
 581                                 if ((targets & AttributeTargets.Class) != 0)\r
 582                                         return true;\r
 583                                 else\r
 584                                         return false;\r
 585                                 \r
 586                         } else if (element is Struct) {\r
 587                                 if ((targets & AttributeTargets.Struct) != 0)\r
 588                                         return true;\r
 589                                 else\r
 590                                         return false;\r
 591                         } else if (element is Constructor) {\r
 592                                 if ((targets & AttributeTargets.Constructor) != 0)\r
 593                                         return true;\r
 594                                 else\r
 595                                         return false;\r
 596                         } else if (element is Delegate) {\r
 597                                 if ((targets & AttributeTargets.Delegate) != 0)\r
 598                                         return true;\r
 599                                 else\r
 600                                         return false;\r
 601                         } else if (element is Enum) {\r
 602                                 if ((targets & AttributeTargets.Enum) != 0)\r
 603                                         return true;\r
 604                                 else\r
 605                                         return false;\r
 606                         } else if (element is Event || element is InterfaceEvent) {\r
 607                                 if ((targets & AttributeTargets.Event) != 0)\r
 608                                         return true;\r
 609                                 else\r
 610                                         return false;\r
 611                         } else if (element is Field || element is FieldBuilder) {\r
 612                                 if ((targets & AttributeTargets.Field) != 0)\r
 613                                         return true;\r
 614                                 else\r
 615                                         return false;\r
 616                         } else if (element is Interface) {\r
 617                                 if ((targets & AttributeTargets.Interface) != 0)\r
 618                                         return true;\r
 619                                 else\r
 620                                         return false;\r
 621                         } else if (element is Method || element is Operator ||\r
 622                                    element is InterfaceMethod || element is Accessor) {\r
 623                                 if ((targets & AttributeTargets.Method) != 0)\r
 624                                         return true;\r
 625                                 else\r
 626                                         return false;\r
 627                         } else if (element is ParameterBuilder) {\r
 628                                 if ((targets & AttributeTargets.Parameter) != 0 ||\r
 629                                     (targets & AttributeTargets.ReturnValue) != 0)\r
 630                                         return true;\r
 631                                 else\r
 632                                         return false;\r
 633                         } else if (element is Property || element is Indexer ||\r
 634                                    element is InterfaceProperty || element is InterfaceIndexer) {\r
 635                                 if ((targets & AttributeTargets.Property) != 0)\r
 636                                         return true;\r
 637                                 else\r
 638                                         return false;\r
 639                         } else if (element is AssemblyBuilder){\r
 640                                 if ((targets & AttributeTargets.Assembly) != 0)\r
 641                                         return true;\r
 642                                 else\r
 643                                         return false;\r
 644                         }\r
 645 \r
 646                         return false;\r
 647                 }\r
 648 \r
 649                 //\r
 650                 // This method should be invoked to pull the IndexerName attribute from an\r
 651                 // Indexer if it exists.\r
 652                 //\r
 653                 public static string ScanForIndexerName (EmitContext ec, Attributes opt_attrs)\r
 654                 {\r
 655                         if (opt_attrs == null)\r
 656                                 return null;\r
 657                         if (opt_attrs.AttributeSections == null)\r
 658                                 return null;\r
 659 \r
 660                         foreach (AttributeSection asec in opt_attrs.AttributeSections) {\r
 661                                 if (asec.Attributes == null)\r
 662                                         continue;\r
 663 \r
 664                                 foreach (Attribute a in asec.Attributes){\r
 665                                         if (a.ResolveType (ec) == null)\r
 666                                                 return null;\r
 667 \r
 668                                         if (a.Type != TypeManager.indexer_name_type)\r
 669                                                 continue;\r
 670 \r
 671                                         //\r
 672                                         // So we have found an IndexerName, pull the data out.\r
 673                                         //\r
 674                                         if (a.Arguments == null || a.Arguments [0] == null){\r
 675                                                 Error_AttributeConstructorMismatch (a.Location);\r
 676                                                 return null;\r
 677                                         }\r
 678                                         ArrayList pos_args = (ArrayList) a.Arguments [0];\r
 679                                         if (pos_args.Count == 0){\r
 680                                                 Error_AttributeConstructorMismatch (a.Location);\r
 681                                                 return null;\r
 682                                         }\r
 683                                         \r
 684                                         Argument arg = (Argument) pos_args [0];\r
 685                                         if (!arg.Resolve (ec, a.Location))\r
 686                                                 return null;\r
 687                                         \r
 688                                         Expression e = arg.Expr;\r
 689                                         if (!(e is StringConstant)){\r
 690                                                 Error_AttributeConstructorMismatch (a.Location);\r
 691                                                 return null;\r
 692                                         }\r
 693 \r
 694                                         //\r
 695                                         // Remove the attribute from the list\r
 696                                         //\r
 697                                         asec.Attributes.Remove (a);\r
 698 \r
 699                                         return (((StringConstant) e).Value);\r
 700                                 }\r
 701                         }\r
 702                         return null;\r
 703                 }\r
 704 \r
 705                 //\r
 706                 // This pulls the condition name out of a Conditional attribute\r
 707                 //\r
 708                 public string Conditional_GetConditionName ()\r
 709                 {\r
 710                         //\r
 711                         // So we have a Conditional, pull the data out.\r
 712                         //\r
 713                         if (Arguments == null || Arguments [0] == null){\r
 714                                 Error_AttributeConstructorMismatch (Location);\r
 715                                 return null;\r
 716                         }\r
 717 \r
 718                         ArrayList pos_args = (ArrayList) Arguments [0];\r
 719                         if (pos_args.Count != 1){\r
 720                                 Error_AttributeConstructorMismatch (Location);\r
 721                                 return null;\r
 722                         }\r
 723 \r
 724                         Argument arg = (Argument) pos_args [0]; \r
 725                         if (!(arg.Expr is StringConstant)){\r
 726                                 Error_AttributeConstructorMismatch (Location);\r
 727                                 return null;\r
 728                         }\r
 729 \r
 730                         return ((StringConstant) arg.Expr).Value;\r
 731                 }\r
 732 \r
 733                 //\r
 734                 // This pulls the obsolete message and error flag out of an Obsolete attribute\r
 735                 //\r
 736                 public string Obsolete_GetObsoleteMessage (out bool is_error)\r
 737                 {\r
 738                         is_error = false;\r
 739                         //\r
 740                         // So we have an Obsolete, pull the data out.\r
 741                         //\r
 742                         if (Arguments == null || Arguments [0] == null)\r
 743                                 return "";\r
 744 \r
 745                         ArrayList pos_args = (ArrayList) Arguments [0];\r
 746                         if (pos_args.Count == 0)\r
 747                                 return "";\r
 748                         else if (pos_args.Count > 2){\r
 749                                 Error_AttributeConstructorMismatch (Location);\r
 750                                 return null;\r
 751                         }\r
 752 \r
 753                         Argument arg = (Argument) pos_args [0]; \r
 754                         if (!(arg.Expr is StringConstant)){\r
 755                                 Error_AttributeConstructorMismatch (Location);\r
 756                                 return null;\r
 757                         }\r
 758 \r
 759                         if (pos_args.Count == 2){\r
 760                                 Argument arg2 = (Argument) pos_args [1];\r
 761                                 if (!(arg2.Expr is BoolConstant)){\r
 762                                         Error_AttributeConstructorMismatch (Location);\r
 763                                         return null;\r
 764                                 }\r
 765                                 is_error = ((BoolConstant) arg2.Expr).Value;\r
 766                         }\r
 767 \r
 768                         return ((StringConstant) arg.Expr).Value;\r
 769                 }\r
 770 \r
 771                 static object GetFieldValue (Attribute a, string name)\r
 772                 {\r
 773                         int i;\r
 774                         if (a.field_info_arr == null)\r
 775                                 return null;\r
 776                         i = 0;\r
 777                         foreach (FieldInfo fi in a.field_info_arr) {\r
 778                                 if (fi.Name == name)\r
 779                                         return a.field_values_arr [i];\r
 780                                 i++;\r
 781                         }\r
 782                         return null;\r
 783                 }\r
 784 \r
 785                 static UnmanagedMarshal GetMarshal (Attribute a)\r
 786                 {\r
 787                         object o = GetFieldValue (a, "ArraySubType");\r
 788                         UnmanagedType array_sub_type = o == null ? UnmanagedType.I4 : (UnmanagedType) o;\r
 789                         switch (a.UnmanagedType) {\r
 790                         case UnmanagedType.CustomMarshaler:\r
 791                                 MethodInfo define_custom = typeof (UnmanagedMarshal).GetMethod ("DefineCustom",\r
 792                                                                        BindingFlags.Static | BindingFlags.Public);\r
 793                                 if (define_custom == null)\r
 794                                         return null;\r
 795 \r
 796                                 object [] args = new object [4];\r
 797                                 args [0] = GetFieldValue (a, "MarshalTypeRef");\r
 798                                 args [1] = GetFieldValue (a, "MarshalCookie");\r
 799                                 args [2] = GetFieldValue (a, "MarshalType");\r
 800                                 args [3] = Guid.Empty;\r
 801                                 return (UnmanagedMarshal) define_custom.Invoke (null, args);\r
 802 \r
 803                         case UnmanagedType.LPArray:                             \r
 804                                 return UnmanagedMarshal.DefineLPArray (array_sub_type);\r
 805 \r
 806                         case UnmanagedType.SafeArray:\r
 807                                 return UnmanagedMarshal.DefineSafeArray (array_sub_type);\r
 808 \r
 809                         case UnmanagedType.ByValArray:\r
 810                                 return UnmanagedMarshal.DefineByValArray ((int) GetFieldValue (a, "SizeConst"));\r
 811 \r
 812                         case UnmanagedType.ByValTStr:\r
 813                                 return UnmanagedMarshal.DefineByValTStr ((int) GetFieldValue (a, "SizeConst"));\r
 814 \r
 815                         default:\r
 816                                 return UnmanagedMarshal.DefineUnmanagedMarshal (a.UnmanagedType);\r
 817                         }\r
 818                 }\r
 819 \r
 820                 /// <summary>\r
 821                 ///   Applies the attributes specified on target 'kind' to the `builder'.\r
 822                 /// </summary>\r
 823                 public static void ApplyAttributes (EmitContext ec, object builder, object kind,\r
 824                                                     Attributes opt_attrs)\r
 825                 {\r
 826                         Type attr_type = null;\r
 827                         \r
 828                         if (opt_attrs == null)\r
 829                                 return;\r
 830                         if (opt_attrs.AttributeSections == null)\r
 831                                 return;\r
 832 \r
 833                         ArrayList emitted_attrs = new ArrayList ();\r
 834                         ArrayList emitted_targets = new ArrayList ();\r
 835 \r
 836                         foreach (AttributeSection asec in opt_attrs.AttributeSections) {\r
 837                                 string attr_target = asec.Target;\r
 838                                 \r
 839                                 if (asec.Attributes == null)\r
 840                                         continue;\r
 841 \r
 842                                 if (attr_target == "assembly" && !(builder is AssemblyBuilder))\r
 843                                         continue;\r
 844 \r
 845                                 if (attr_target == "return" && !(builder is ParameterBuilder))\r
 846                                         continue;\r
 847                                 \r
 848                                 foreach (Attribute a in asec.Attributes) {\r
 849                                         Location loc = a.Location;\r
 850                                         CustomAttributeBuilder cb = a.Resolve (ec);\r
 851                                         attr_type = a.Type;\r
 852 \r
 853                                         if (cb == null) \r
 854                                                 continue;\r
 855                                         \r
 856                                         if (!(kind is TypeContainer))\r
 857                                                 if (!CheckAttributeTarget (a, kind)) {\r
 858                                                         Error_AttributeNotValidForElement (a, loc);\r
 859                                                         return;\r
 860                                                 }\r
 861 \r
 862                                         //\r
 863                                         // Perform the check for duplicate attributes\r
 864                                         //\r
 865                                         if (emitted_attrs.Contains (attr_type) &&\r
 866                                             emitted_targets.Contains (attr_target) &&\r
 867                                             !TypeManager.AreMultipleAllowed (attr_type)) {\r
 868                                                 Report.Error (579, loc, "Duplicate '" + a.Name + "' attribute");\r
 869                                                 return;\r
 870                                         }\r
 871 \r
 872                                         if (kind is Method || kind is Operator || kind is InterfaceMethod ||\r
 873                                             kind is Accessor) {\r
 874                                                 if (attr_type == TypeManager.methodimpl_attr_type) {\r
 875                                                         if (a.ImplOptions == MethodImplOptions.InternalCall)\r
 876                                                                 ((MethodBuilder) builder).\r
 877                                                                 SetImplementationFlags (\r
 878                                                                         MethodImplAttributes.InternalCall |\r
 879                                                                         MethodImplAttributes.Runtime);\r
 880                                                         else\r
 881                                                                 ((MethodBuilder) builder).SetCustomAttribute (cb);\r
 882                                                 } else if (attr_type != TypeManager.dllimport_type){\r
 883                                                         ((MethodBuilder) builder).SetCustomAttribute (cb);\r
 884                                                 }\r
 885                                         } else if (kind is Constructor) {\r
 886                                                 ((ConstructorBuilder) builder).SetCustomAttribute (cb);\r
 887                                         } else if (kind is Field) {\r
 888                                                 if (attr_type == TypeManager.marshal_as_attr_type) {\r
 889                                                         UnmanagedMarshal marshal = GetMarshal (a);\r
 890                                                         if (marshal == null) {\r
 891                                                                 Report.Warning (-24, loc,\r
 892                                                                         "The Microsoft Runtime cannot set this marshal info. " +\r
 893                                                                         "Please use the Mono runtime instead.");\r
 894                                                         } else {\r
 895                                                                 ((FieldBuilder) builder).SetMarshal (marshal);\r
 896                                                         }\r
 897                                                 } else { \r
 898                                                         ((FieldBuilder) builder).SetCustomAttribute (cb);\r
 899                                                 }\r
 900                                         } else if (kind is Property || kind is Indexer ||\r
 901                                                    kind is InterfaceProperty || kind is InterfaceIndexer) {\r
 902                                                 ((PropertyBuilder) builder).SetCustomAttribute (cb);\r
 903                                         } else if (kind is Event || kind is InterfaceEvent) {\r
 904                                                 ((MyEventBuilder) builder).SetCustomAttribute (cb);\r
 905                                         } else if (kind is ParameterBuilder) {\r
 906 \r
 907                                                 if (attr_type == TypeManager.marshal_as_attr_type) {\r
 908                                                         UnmanagedMarshal marshal = GetMarshal (a);\r
 909                                                         if (marshal == null) {\r
 910                                                                 Report.Warning (-24, loc,\r
 911                                                                         "The Microsoft Runtime cannot set this marshal info. " +\r
 912                                                                         "Please use the Mono runtime instead.");\r
 913                                                         } else {\r
 914                                                                 ((ParameterBuilder) builder).SetMarshal (marshal);\r
 915                                                         }\r
 916                                                 } else { \r
 917 \r
 918                                                         try {\r
 919                                                                 ((ParameterBuilder) builder).SetCustomAttribute (cb);\r
 920                                                         } catch (System.ArgumentException) {\r
 921                                                                 Report.Warning (-24, loc,\r
 922                                                                                 "The Microsoft Runtime cannot set attributes \n" +\r
 923                                                                                 "on the return type of a method. Please use the \n" +\r
 924                                                                                 "Mono runtime instead.");\r
 925                                                         }\r
 926 \r
 927                                                 }\r
 928                                         } else if (kind is Enum) {\r
 929                                                 ((TypeBuilder) builder).SetCustomAttribute (cb); \r
 930 \r
 931                                         } else if (kind is TypeContainer) {\r
 932                                                 TypeContainer tc = (TypeContainer) kind;\r
 933                                                 \r
 934                                                 if (a.UsageAttr) {\r
 935                                                         tc.Targets = a.Targets;\r
 936                                                         tc.AllowMultiple = a.AllowMultiple;\r
 937                                                         tc.Inherited = a.Inherited;\r
 938 \r
 939                                                         TypeManager.RegisterAttributeAllowMultiple (tc.TypeBuilder,\r
 940                                                                                                     tc.AllowMultiple);\r
 941                                                         \r
 942                                                 } else if (attr_type == TypeManager.default_member_type) {\r
 943                                                         if (tc.Indexers != null) {\r
 944                                                                 Report.Error (646, loc,\r
 945                                                                       "Cannot specify the DefaultMember attribute on" +\r
 946                                                                       " a type containing an indexer");\r
 947                                                                 return;\r
 948                                                         }\r
 949 \r
 950                                                 } else {\r
 951                                                         if (!CheckAttributeTarget (a, kind)) {\r
 952                                                                 Error_AttributeNotValidForElement (a, loc);\r
 953                                                                 return;\r
 954                                                         }\r
 955                                                 }\r
 956 \r
 957                                                 try {\r
 958                                                         ((TypeBuilder) builder).SetCustomAttribute (cb);\r
 959                                                 } catch (System.ArgumentException) {\r
 960                                                         Report.Warning (\r
 961                                                                 -21, loc,\r
 962                                                 "The CharSet named property on StructLayout\n"+\r
 963                                                 "\tdoes not work correctly on Microsoft.NET\n"+\r
 964                                                 "\tYou might want to remove the CharSet declaration\n"+\r
 965                                                 "\tor compile using the Mono runtime instead of the\n"+\r
 966                                                 "\tMicrosoft .NET runtime");\r
 967                                                 }\r
 968                                         } else if (kind is Delegate){\r
 969                                                 if (!CheckAttributeTarget (a, kind)) {\r
 970                                                         Error_AttributeNotValidForElement (a, loc);\r
 971                                                         return;\r
 972                                                 }\r
 973                                                 try {\r
 974                                                         ((TypeBuilder) builder).SetCustomAttribute (cb);\r
 975                                                 } catch (System.ArgumentException) {\r
 976                                                         Report.Warning (\r
 977                                                                 -21, loc,\r
 978                                                 "The CharSet named property on StructLayout\n"+\r
 979                                                 "\tdoes not work correctly on Microsoft.NET\n"+\r
 980                                                 "\tYou might want to remove the CharSet declaration\n"+\r
 981                                                 "\tor compile using the Mono runtime instead of the\n"+\r
 982                                                 "\tMicrosoft .NET runtime");\r
 983                                                 }\r
 984                                         } else if (kind is Interface) {\r
 985                                                 Interface iface = (Interface) kind;\r
 986 \r
 987                                                 if ((attr_type == TypeManager.default_member_type) &&\r
 988                                                     (iface.InterfaceIndexers != null)) {\r
 989                                                         Report.Error (\r
 990                                                                 646, loc,\r
 991                                                                 "Cannot specify the DefaultMember attribute on" +\r
 992                                                                 " a type containing an indexer");\r
 993                                                         return;\r
 994                                                 }\r
 995 \r
 996                                                 if (!CheckAttributeTarget (a, kind)) {\r
 997                                                         Error_AttributeNotValidForElement (a, loc);\r
 998                                                         return;\r
 999                                                 }\r
1000 \r
1001                                                 ((TypeBuilder) builder).SetCustomAttribute (cb);\r
1002                                         } else if (kind is AssemblyBuilder){\r
1003                                                 ((AssemblyBuilder) builder).SetCustomAttribute (cb);\r
1004                                         } else if (kind is ModuleBuilder) {\r
1005                                                 ((ModuleBuilder) builder).SetCustomAttribute (cb);\r
1006                                         } else if (kind is FieldBuilder) {\r
1007                                                 if (attr_type == TypeManager.marshal_as_attr_type) {\r
1008                                                         UnmanagedMarshal marshal = GetMarshal (a);\r
1009                                                         if (marshal == null) {\r
1010                                                                 Report.Warning (-24, loc,\r
1011                                                                         "The Microsoft Runtime cannot set this marshal info. " +\r
1012                                                                         "Please use the Mono runtime instead.");\r
1013                                                         } else {\r
1014                                                                 ((ParameterBuilder) builder).SetMarshal (marshal);\r
1015                                                         }\r
1016                                                 } else { \r
1017                                                         ((FieldBuilder) builder).SetCustomAttribute (cb);\r
1018                                                 }\r
1019                                         } else\r
1020                                                 throw new Exception ("Unknown kind: " + kind);\r
1021 \r
1022                                         //\r
1023                                         // Once an attribute type has been emitted once we\r
1024                                         // keep track of the info to prevent multiple occurences\r
1025                                         // for attributes which do not explicitly allow it\r
1026                                         //\r
1027                                         if (!emitted_attrs.Contains (attr_type))\r
1028                                                 emitted_attrs.Add (attr_type);\r
1029 \r
1030                                         //\r
1031                                         // We keep of this target-wise and so emitted targets\r
1032                                         // are tracked too\r
1033                                         //\r
1034                                         if (!emitted_targets.Contains (attr_target))\r
1035                                                 emitted_targets.Add (attr_target);\r
1036                                 }\r
1037                                 \r
1038                                 \r
1039                         }\r
1040                 }\r
1041 \r
1042                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,\r
1043                                                           MethodAttributes flags, Type ret_type, Type [] param_types)\r
1044                 {\r
1045                         //\r
1046                         // We extract from the attribute the information we need \r
1047                         //\r
1048 \r
1049                         if (Arguments == null) {\r
1050                                 Console.WriteLine ("Internal error : this is not supposed to happen !");\r
1051                                 return null;\r
1052                         }\r
1053 \r
1054                         Type = CheckAttributeType (ec);\r
1055                         if (Type == null)\r
1056                                 return null;\r
1057                         \r
1058                         ArrayList named_args = new ArrayList ();\r
1059                         \r
1060                         ArrayList pos_args = (ArrayList) Arguments [0];\r
1061                         if (Arguments.Count > 1)\r
1062                                 named_args = (ArrayList) Arguments [1];\r
1063                         \r
1064 \r
1065                         string dll_name = null;\r
1066                         \r
1067                         Argument tmp = (Argument) pos_args [0];\r
1068 \r
1069                         if (!tmp.Resolve (ec, Location))\r
1070                                 return null;\r
1071                         \r
1072                         if (tmp.Expr is Constant)\r
1073                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();\r
1074                         else { \r
1075                                 Error_AttributeArgumentNotValid (Location);\r
1076                                 return null;\r
1077                         }\r
1078 \r
1079                         // Now we process the named arguments\r
1080                         CallingConvention cc = CallingConvention.Winapi;\r
1081                         CharSet charset = CharSet.Ansi;\r
1082                         bool preserve_sig = true;\r
1083 #if FIXME\r
1084                         bool exact_spelling = false;\r
1085 #endif\r
1086                         bool set_last_err = false;\r
1087                         string entry_point = null;\r
1088 \r
1089                         for (int i = 0; i < named_args.Count; i++) {\r
1090 \r
1091                                 DictionaryEntry de = (DictionaryEntry) named_args [i];\r
1092 \r
1093                                 string member_name = (string) de.Key;\r
1094                                 Argument a  = (Argument) de.Value;\r
1095 \r
1096                                 if (!a.Resolve (ec, Location))\r
1097                                         return null;\r
1098 \r
1099                                 Expression member = Expression.MemberLookup (\r
1100                                         ec, Type, member_name, \r
1101                                         MemberTypes.Field | MemberTypes.Property,\r
1102                                         BindingFlags.Public | BindingFlags.Instance,\r
1103                                         Location);\r
1104 \r
1105                                 if (member == null || !(member is FieldExpr)) {\r
1106                                         Error_InvalidNamedArgument (member_name);\r
1107                                         return null;\r
1108                                 }\r
1109 \r
1110                                 if (member is FieldExpr) {\r
1111                                         FieldExpr fe = (FieldExpr) member;\r
1112                                         FieldInfo fi = fe.FieldInfo;\r
1113 \r
1114                                         if (fi.IsInitOnly) {\r
1115                                                 Error_InvalidNamedArgument (member_name);\r
1116                                                 return null;\r
1117                                         }\r
1118 \r
1119                                         if (a.Expr is Constant) {\r
1120                                                 Constant c = (Constant) a.Expr;\r
1121                                                 \r
1122                                                 if (member_name == "CallingConvention")\r
1123                                                         cc = (CallingConvention) c.GetValue ();\r
1124                                                 else if (member_name == "CharSet")\r
1125                                                         charset = (CharSet) c.GetValue ();\r
1126                                                 else if (member_name == "EntryPoint")\r
1127                                                         entry_point = (string) c.GetValue ();\r
1128                                                 else if (member_name == "SetLastError")\r
1129                                                         set_last_err = (bool) c.GetValue ();\r
1130 #if FIXME\r
1131                                                 else if (member_name == "ExactSpelling")\r
1132                                                         exact_spelling = (bool) c.GetValue ();\r
1133 #endif\r
1134                                                 else if (member_name == "PreserveSig")\r
1135                                                         preserve_sig = (bool) c.GetValue ();\r
1136                                         } else { \r
1137                                                 Error_AttributeArgumentNotValid (Location);\r
1138                                                 return null;\r
1139                                         }\r
1140                                         \r
1141                                 }\r
1142                         }\r
1143 \r
1144                         if (entry_point == null)\r
1145                                 entry_point = name;\r
1146                         if (set_last_err)\r
1147                                 charset = (CharSet)((int)charset | 0x40);\r
1148                         \r
1149                         MethodBuilder mb = builder.DefinePInvokeMethod (\r
1150                                 name, dll_name, entry_point, flags | MethodAttributes.HideBySig,\r
1151                                 CallingConventions.Standard,\r
1152                                 ret_type,\r
1153                                 param_types,\r
1154                                 cc,\r
1155                                 charset);\r
1156 \r
1157                         if (preserve_sig)\r
1158                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);\r
1159                         \r
1160                         return mb;\r
1161                 }\r
1162                 \r
1163         }\r
1164         \r
1165         public class AttributeSection {\r
1166                 public readonly string    Target;\r
1167                 public readonly ArrayList Attributes;\r
1168                 \r
1169                 public AttributeSection (string target, ArrayList attrs)\r
1170                 {\r
1171                         Target = target;\r
1172                         Attributes = attrs;\r
1173                 }\r
1174                 \r
1175         }\r
1176 \r
1177         public class Attributes {\r
1178                 public ArrayList AttributeSections;\r
1179 \r
1180                 public Attributes (AttributeSection a)\r
1181                 {\r
1182                         AttributeSections = new ArrayList ();\r
1183                         AttributeSections.Add (a);\r
1184 \r
1185                 }\r
1186 \r
1187                 public void AddAttributeSection (AttributeSection a)\r
1188                 {\r
1189                         if (a != null && !AttributeSections.Contains (a))\r
1190                                 AttributeSections.Add (a);\r
1191                 }\r
1192 \r
1193                 public bool Contains (Type t)\r
1194                 {\r
1195                         foreach (AttributeSection attr_section in AttributeSections){\r
1196                                 foreach (Attribute a in attr_section.Attributes){\r
1197                                         if (a.Type == t)\r
1198                                                 return true;\r
1199                                 }\r
1200                         }\r
1201                         \r
1202                         return false;\r
1203                 }\r
1204         }\r
1205 }\r