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