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.Collections;\r
  14 using System.Reflection;\r
  15 using System.Reflection.Emit;\r
  16 using System.Runtime.InteropServices;\r
  17 using System.Runtime.CompilerServices;\r
  18 using System.Text;\r
  19 \r
  20 namespace Mono.CSharp {\r
  21 \r
  22         public class Attribute {\r
  23                 public readonly string    Name;\r
  24                 public readonly ArrayList Arguments;\r
  25 \r
  26                 Location Location;\r
  27 \r
  28                 public Type Type;\r
  29                 \r
  30                 //\r
  31                 // The following are only meaningful when the attribute\r
  32                 // being emitted is one of the builtin ones\r
  33                 //\r
  34                 public AttributeTargets Targets;\r
  35                 public bool AllowMultiple;\r
  36                 public bool Inherited;\r
  37 \r
  38                 public bool UsageAttr = false;\r
  39                 \r
  40                 public MethodImplOptions ImplOptions;\r
  41                 public UnmanagedType     UnmanagedType;\r
  42                 \r
  43                 public Attribute (string name, ArrayList args, Location loc)\r
  44                 {\r
  45                         Name = name;\r
  46                         Arguments = args;\r
  47                         Location = loc;\r
  48                 }\r
  49 \r
  50                 void error617 (string name)\r
  51                 {\r
  52                         Report.Error (617, Location, "'" + name + "' is not a valid named attribute " +\r
  53                                       "argument. Named attribute arguments must be fields which are not " +\r
  54                                       "readonly, static or const, or properties with a set accessor which "+\r
  55                                       "are not static.");\r
  56                 }\r
  57 \r
  58                 void error182 ()\r
  59                 {\r
  60                         Report.Error (182, Location,\r
  61                                       "An attribute argument must be a constant expression, typeof " +\r
  62                                       "expression or array creation expression");\r
  63                 }\r
  64 \r
  65                 public CustomAttributeBuilder Resolve (EmitContext ec)\r
  66                 {\r
  67                         string name = Name;\r
  68                         bool MethodImplAttr = false;\r
  69                         bool MarshalAsAttr = false;\r
  70 \r
  71                         UsageAttr = false;\r
  72 \r
  73                         if (Name.IndexOf ("Attribute") == -1)\r
  74                                 name = Name + "Attribute";\r
  75                         else if (Name.LastIndexOf ("Attribute") == 0)\r
  76                                 name = Name + "Attribute";\r
  77 \r
  78                         Type = RootContext.LookupType (ec.DeclSpace, name, false, Location);\r
  79 \r
  80                         if (Type == null) {\r
  81                                 Report.Error (\r
  82                                         246, Location, "Could not find attribute '" + Name + "' (are you" +\r
  83                                         " missing a using directive or an assembly reference ?)");\r
  84                                 return null;\r
  85                         }\r
  86 \r
  87                         if (Type == TypeManager.attribute_usage_type)\r
  88                                 UsageAttr = true;\r
  89                         if (Type == TypeManager.methodimpl_attr_type)\r
  90                                 MethodImplAttr = true;\r
  91                         if (Type == TypeManager.marshal_as_attr_type)\r
  92                                 MarshalAsAttr = true;\r
  93                         \r
  94 \r
  95                         // Now we extract the positional and named arguments\r
  96                         \r
  97                         ArrayList pos_args = new ArrayList ();\r
  98                         ArrayList named_args = new ArrayList ();\r
  99                         \r
 100                         if (Arguments != null) {\r
 101                                 pos_args = (ArrayList) Arguments [0];\r
 102                                 if (Arguments.Count > 1)\r
 103                                         named_args = (ArrayList) Arguments [1];\r
 104                         }\r
 105                                 \r
 106                         object [] pos_values = new object [pos_args.Count];\r
 107 \r
 108                         //\r
 109                         // First process positional arguments \r
 110                         //\r
 111                         \r
 112                         int i;\r
 113                         for (i = 0; i < pos_args.Count; i++) {\r
 114                                 Argument a = (Argument) pos_args [i];\r
 115                                 Expression e;\r
 116 \r
 117                                 if (!a.Resolve (ec, Location))\r
 118                                         return null;\r
 119 \r
 120                                 e = a.Expr;\r
 121                                 if (e is Constant) {\r
 122                                         pos_values [i] = ((Constant) e).GetValue ();\r
 123 \r
 124                                         if (UsageAttr)\r
 125                                                 this.Targets = (AttributeTargets) pos_values [0];\r
 126 \r
 127                                         if (MethodImplAttr)\r
 128                                                 this.ImplOptions = (MethodImplOptions) pos_values [0];\r
 129 \r
 130                                         if (MarshalAsAttr)\r
 131                                                 this.UnmanagedType = (System.Runtime.InteropServices.UnmanagedType) pos_values [0];\r
 132                                         \r
 133                                 } else { \r
 134                                         error182 ();\r
 135                                         return null;\r
 136                                 }\r
 137                         }\r
 138 \r
 139                         //\r
 140                         // Now process named arguments\r
 141                         //\r
 142 \r
 143                         ArrayList field_infos = new ArrayList ();\r
 144                         ArrayList prop_infos  = new ArrayList ();\r
 145                         ArrayList field_values = new ArrayList ();\r
 146                         ArrayList prop_values = new ArrayList ();\r
 147                         \r
 148                         for (i = 0; i < named_args.Count; i++) {\r
 149                                 DictionaryEntry de = (DictionaryEntry) named_args [i];\r
 150                                 string member_name = (string) de.Key;\r
 151                                 Argument a  = (Argument) de.Value;\r
 152                                 Expression e;\r
 153                                 \r
 154                                 if (!a.Resolve (ec, Location))\r
 155                                         return null;\r
 156 \r
 157                                 Expression member = Expression.MemberLookup (\r
 158                                         ec, Type, member_name,\r
 159                                         MemberTypes.Field | MemberTypes.Property,\r
 160                                         BindingFlags.Public | BindingFlags.Instance,\r
 161                                         Location);\r
 162 \r
 163                                 if (member == null || !(member is PropertyExpr || member is FieldExpr)) {\r
 164                                         error617 (member_name);\r
 165                                         return null;\r
 166                                 }\r
 167 \r
 168                                 e = a.Expr;\r
 169                                 if (member is PropertyExpr) {\r
 170                                         PropertyExpr pe = (PropertyExpr) member;\r
 171                                         PropertyInfo pi = pe.PropertyInfo;\r
 172 \r
 173                                         if (!pi.CanWrite) {\r
 174                                                 error617 (member_name);\r
 175                                                 return null;\r
 176                                         }\r
 177 \r
 178                                         if (e is Constant) {\r
 179                                                 object o = ((Constant) e).GetValue ();\r
 180                                                 prop_values.Add (o);\r
 181                                                 \r
 182                                                 if (UsageAttr) {\r
 183                                                         if (member_name == "AllowMultiple")\r
 184                                                                 this.AllowMultiple = (bool) o;\r
 185                                                         if (member_name == "Inherited")\r
 186                                                                 this.Inherited = (bool) o;\r
 187                                                 }\r
 188                                                 \r
 189                                         } else { \r
 190                                                 error182 ();\r
 191                                                 return null;\r
 192                                         }\r
 193                                         \r
 194                                         prop_infos.Add (pi);\r
 195                                         \r
 196                                 } else if (member is FieldExpr) {\r
 197                                         FieldExpr fe = (FieldExpr) member;\r
 198                                         FieldInfo fi = fe.FieldInfo;\r
 199 \r
 200                                         if (fi.IsInitOnly) {\r
 201                                                 error617 (member_name);\r
 202                                                 return null;\r
 203                                         }\r
 204 \r
 205                                         if (e is Constant)\r
 206                                                 field_values.Add (((Constant) e).GetValue ());\r
 207                                         else { \r
 208                                                 error182 ();\r
 209                                                 return null;\r
 210                                         }\r
 211                                         \r
 212                                         field_infos.Add (fi);\r
 213                                 }\r
 214                         }\r
 215                         \r
 216                         Expression mg = Expression.MemberLookup (\r
 217                                 ec, Type, ".ctor", MemberTypes.Constructor,\r
 218                                 BindingFlags.Public | BindingFlags.Instance, Location);\r
 219 \r
 220                         if (mg == null) {\r
 221                                 Report.Error (\r
 222                                         -6, Location,\r
 223                                         "Could not find a constructor for this argument list.");\r
 224                                 return null;\r
 225                         }\r
 226 \r
 227                         MethodBase constructor = Invocation.OverloadResolve (\r
 228                                 ec, (MethodGroupExpr) mg, pos_args, Location);\r
 229 \r
 230                         if (constructor == null) {\r
 231                                 Report.Error (\r
 232                                         -6, Location,\r
 233                                         "Could not find a constructor for this argument list.");\r
 234                                 return null;\r
 235                         }\r
 236                         \r
 237                         PropertyInfo [] prop_info_arr = new PropertyInfo [prop_infos.Count];\r
 238                         FieldInfo [] field_info_arr = new FieldInfo [field_infos.Count];\r
 239                         object [] field_values_arr = new object [field_values.Count];\r
 240                         object [] prop_values_arr = new object [prop_values.Count];\r
 241 \r
 242                         field_infos.CopyTo  (field_info_arr, 0);\r
 243                         field_values.CopyTo (field_values_arr, 0);\r
 244 \r
 245                         prop_values.CopyTo  (prop_values_arr, 0);\r
 246                         prop_infos.CopyTo   (prop_info_arr, 0);\r
 247                         \r
 248                         CustomAttributeBuilder cb = new CustomAttributeBuilder (\r
 249                                 (ConstructorInfo) constructor, pos_values,\r
 250                                 prop_info_arr, prop_values_arr,\r
 251                                 field_info_arr, field_values_arr); \r
 252                         \r
 253                         return cb;\r
 254                 }\r
 255 \r
 256                 static string GetValidPlaces (Attribute attr)\r
 257                 {\r
 258                         StringBuilder sb = new StringBuilder ();\r
 259                         AttributeTargets targets = 0;\r
 260                         \r
 261                         TypeContainer a = TypeManager.LookupAttr (attr.Type);\r
 262 \r
 263                         if (a == null) {\r
 264                                 System.Attribute [] attrs = System.Attribute.GetCustomAttributes (attr.Type);\r
 265                                 \r
 266                                 foreach (System.Attribute tmp in attrs)\r
 267                                         if (tmp is AttributeUsageAttribute) \r
 268                                                 targets = ((AttributeUsageAttribute) tmp).ValidOn;\r
 269                         } else\r
 270                                 targets = a.Targets;\r
 271 \r
 272                         \r
 273                         if ((targets & AttributeTargets.Assembly) != 0)\r
 274                                 sb.Append ("'assembly' ");\r
 275 \r
 276                         if ((targets & AttributeTargets.Class) != 0)\r
 277                                 sb.Append ("'class' ");\r
 278 \r
 279                         if ((targets & AttributeTargets.Constructor) != 0)\r
 280                                 sb.Append ("'constructor' ");\r
 281 \r
 282                         if ((targets & AttributeTargets.Delegate) != 0)\r
 283                                 sb.Append ("'delegate' ");\r
 284 \r
 285                         if ((targets & AttributeTargets.Enum) != 0)\r
 286                                 sb.Append ("'enum' ");\r
 287 \r
 288                         if ((targets & AttributeTargets.Event) != 0)\r
 289                                 sb.Append ("'event' ");\r
 290 \r
 291                         if ((targets & AttributeTargets.Field) != 0)\r
 292                                 sb.Append ("'field' ");\r
 293 \r
 294                         if ((targets & AttributeTargets.Interface) != 0)\r
 295                                 sb.Append ("'interface' ");\r
 296 \r
 297                         if ((targets & AttributeTargets.Method) != 0)\r
 298                                 sb.Append ("'method' ");\r
 299 \r
 300                         if ((targets & AttributeTargets.Module) != 0)\r
 301                                 sb.Append ("'module' ");\r
 302 \r
 303                         if ((targets & AttributeTargets.Parameter) != 0)\r
 304                                 sb.Append ("'parameter' ");\r
 305 \r
 306                         if ((targets & AttributeTargets.Property) != 0)\r
 307                                 sb.Append ("'property' ");\r
 308 \r
 309                         if ((targets & AttributeTargets.ReturnValue) != 0)\r
 310                                 sb.Append ("'return value' ");\r
 311 \r
 312                         if ((targets & AttributeTargets.Struct) != 0)\r
 313                                 sb.Append ("'struct' ");\r
 314 \r
 315                         return sb.ToString ();\r
 316 \r
 317                 }\r
 318 \r
 319                 public static void error592 (Attribute a, Location loc)\r
 320                 {\r
 321                         Report.Error (\r
 322                                 592, loc, "Attribute '" + a.Name +\r
 323                                 "' is not valid on this declaration type. " +\r
 324                                 "It is valid on " + GetValidPlaces (a) + "declarations only.");\r
 325                 }\r
 326 \r
 327                 public static bool CheckAttribute (Attribute a, object element)\r
 328                 {\r
 329                         TypeContainer attr = TypeManager.LookupAttr (a.Type);\r
 330                         AttributeTargets targets = 0;\r
 331                         \r
 332                         if (attr == null) {\r
 333                                 System.Attribute [] attrs = System.Attribute.GetCustomAttributes (a.Type);\r
 334 \r
 335                                 foreach (System.Attribute tmp in attrs)\r
 336                                         if (tmp is AttributeUsageAttribute) \r
 337                                                 targets = ((AttributeUsageAttribute) tmp).ValidOn;\r
 338                         } else\r
 339                                 targets = attr.Targets;\r
 340 \r
 341                         if (element is Class) {\r
 342                                 if ((targets & AttributeTargets.Class) != 0)\r
 343                                         return true;\r
 344                                 else\r
 345                                         return false;\r
 346                                 \r
 347                         } else if (element is Struct) {\r
 348                                 if ((targets & AttributeTargets.Struct) != 0)\r
 349                                         return true;\r
 350                                 else\r
 351                                         return false;\r
 352                         } else if (element is Constructor) {\r
 353                                 if ((targets & AttributeTargets.Constructor) != 0)\r
 354                                         return true;\r
 355                                 else\r
 356                                         return false;\r
 357                         } else if (element is Delegate) {\r
 358                                 if ((targets & AttributeTargets.Delegate) != 0)\r
 359                                         return true;\r
 360                                 else\r
 361                                         return false;\r
 362                         } else if (element is Enum) {\r
 363                                 if ((targets & AttributeTargets.Enum) != 0)\r
 364                                         return true;\r
 365                                 else\r
 366                                         return false;\r
 367                         } else if (element is Event) {\r
 368                                 if ((targets & AttributeTargets.Event) != 0)\r
 369                                         return true;\r
 370                                 else\r
 371                                         return false;\r
 372                         } else if (element is Field) {\r
 373                                 if ((targets & AttributeTargets.Field) != 0)\r
 374                                         return true;\r
 375                                 else\r
 376                                         return false;\r
 377                         } else if (element is Interface) {\r
 378                                 if ((targets & AttributeTargets.Interface) != 0)\r
 379                                         return true;\r
 380                                 else\r
 381                                         return false;\r
 382                         } else if (element is Method || element is Operator) {\r
 383                                 if ((targets & AttributeTargets.Method) != 0)\r
 384                                         return true;\r
 385                                 else\r
 386                                         return false;\r
 387                         } else if (element is ParameterBuilder) {\r
 388                                 if ((targets & AttributeTargets.Parameter) != 0)\r
 389                                         return true;\r
 390                                 else\r
 391                                         return false;\r
 392                         } else if (element is Property) {\r
 393                                 if ((targets & AttributeTargets.Property) != 0)\r
 394                                         return true;\r
 395                                 else\r
 396                                         return false;\r
 397                         } else if (element is AssemblyBuilder){\r
 398                                 if ((targets & AttributeTargets.Assembly) != 0)\r
 399                                         return true;\r
 400                                 else\r
 401                                         return false;\r
 402                         }\r
 403 \r
 404                         return false;\r
 405                 }\r
 406 \r
 407                 public static void ApplyAttributes (EmitContext ec, object builder, object kind,\r
 408                                                     Attributes opt_attrs, Location loc)\r
 409                 {\r
 410                         if (opt_attrs == null)\r
 411                                 return;\r
 412 \r
 413                         if (opt_attrs.AttributeSections == null)\r
 414                                 return;\r
 415 \r
 416                         foreach (AttributeSection asec in opt_attrs.AttributeSections) {\r
 417 \r
 418                                 if (asec.Attributes == null)\r
 419                                         continue;\r
 420 \r
 421                                 foreach (Attribute a in asec.Attributes) {\r
 422                                         CustomAttributeBuilder cb = a.Resolve (ec);\r
 423                                         if (cb == null)\r
 424                                                 continue;\r
 425 \r
 426                                         if (!(kind is TypeContainer))\r
 427                                                 if (!CheckAttribute (a, kind)) {\r
 428                                                         error592 (a, loc);\r
 429                                                         return;\r
 430                                                 }\r
 431 \r
 432                                         \r
 433                                         if (kind is Method || kind is Operator) {\r
 434 \r
 435                                                 if (a.Type == TypeManager.methodimpl_attr_type) {\r
 436                                                         if (a.ImplOptions == MethodImplOptions.InternalCall)\r
 437                                                                 ((MethodBuilder) builder).SetImplementationFlags (\r
 438                                                                            MethodImplAttributes.InternalCall |\r
 439                                                                            MethodImplAttributes.Runtime);\r
 440                                                 } else if (a.Type != TypeManager.dllimport_type)\r
 441                                                         ((MethodBuilder) builder).SetCustomAttribute (cb);\r
 442 \r
 443                                         } else if (kind is Constructor) {\r
 444                                                 ((ConstructorBuilder) builder).SetCustomAttribute (cb);\r
 445                                         } else if (kind is Field) {\r
 446                                                 ((FieldBuilder) builder).SetCustomAttribute (cb);\r
 447                                         } else if (kind is Property || kind is Indexer) {\r
 448                                                 ((PropertyBuilder) builder).SetCustomAttribute (cb);\r
 449                                         } else if (kind is Event) {\r
 450                                                 ((EventBuilder) builder).SetCustomAttribute (cb);\r
 451                                         } else if (kind is ParameterBuilder) {\r
 452 \r
 453                                                 if (a.Type == TypeManager.marshal_as_attr_type) {\r
 454                                                         UnmanagedMarshal marshal =\r
 455                                                                 UnmanagedMarshal.DefineUnmanagedMarshal (a.UnmanagedType);\r
 456                                                         \r
 457                                                         ((ParameterBuilder) builder).SetMarshal (marshal);\r
 458                                                 } else \r
 459                                                         ((ParameterBuilder) builder).SetCustomAttribute (cb);\r
 460                                                 \r
 461                                         } else if (kind is Enum) {\r
 462                                                 ((TypeBuilder) builder).SetCustomAttribute (cb); \r
 463 \r
 464                                         } else if (kind is TypeContainer) {\r
 465 \r
 466                                                 TypeContainer tc = (TypeContainer) kind;\r
 467                                                 \r
 468                                                 if (a.UsageAttr) {\r
 469                                                         tc.Targets = a.Targets;\r
 470                                                         tc.AllowMultiple = a.AllowMultiple;\r
 471                                                         tc.Inherited = a.Inherited;\r
 472                                                         \r
 473                                                         RootContext.TypeManager.RegisterAttrType (\r
 474                                                                                  (TypeBuilder) builder, tc);\r
 475 \r
 476                                                 } else if (a.Type == TypeManager.default_member_type) {\r
 477                                                         if (tc.Indexers != null) {\r
 478                                                                 Report.Error (646, loc,\r
 479                                                                       "Cannot specify the DefaultMember attribute on " +\r
 480                                                                       " a type containing an indexer");\r
 481                                                                 return;\r
 482                                                         }\r
 483 \r
 484                                                 } else {\r
 485                                                         if (!CheckAttribute (a, kind)) {\r
 486                                                                 error592 (a, loc);\r
 487                                                                 return;\r
 488                                                         }\r
 489                                                 }\r
 490                                                 \r
 491                                                 ((TypeBuilder) builder).SetCustomAttribute (cb);\r
 492                                                 \r
 493                                         } else if (kind is AssemblyBuilder){\r
 494                                                 ((AssemblyBuilder) builder).SetCustomAttribute (cb);\r
 495                                         } else if (kind is ModuleBuilder) {\r
 496                                                 ((ModuleBuilder) builder).SetCustomAttribute (cb);\r
 497                                         } else\r
 498                                                 throw new Exception ("Unknown kind: " + kind);\r
 499                                 }\r
 500                         }\r
 501                 }\r
 502 \r
 503                 public MethodBuilder DefinePInvokeMethod (EmitContext ec, TypeBuilder builder, string name,\r
 504                                                           MethodAttributes flags, Type ret_type, Type [] param_types)\r
 505                 {\r
 506                         //\r
 507                         // We extract from the attribute the information we need \r
 508                         //\r
 509 \r
 510                         if (Arguments == null) {\r
 511                                 Console.WriteLine ("Internal error : this is not supposed to happen !");\r
 512                                 return null;\r
 513                         }\r
 514 \r
 515                         string attr_name = Name;\r
 516 \r
 517                         if (Name.IndexOf ("Attribute") == -1)\r
 518                                 attr_name = Name + "Attribute";\r
 519                         else if (Name.LastIndexOf ("Attribute") == 0)\r
 520                                 attr_name = Name + "Attribute";\r
 521                         \r
 522                         Type = RootContext.LookupType (ec.DeclSpace, attr_name, false, Location);\r
 523 \r
 524                         if (Type == null) {\r
 525                                 Report.Error (246, Location, "Could not find attribute '" + Name + "' (are you" +\r
 526                                               " missing a using directive or an assembly reference ?)");\r
 527                                 return null;\r
 528                         }\r
 529                         \r
 530                         ArrayList named_args = new ArrayList ();\r
 531                         \r
 532                         ArrayList pos_args = (ArrayList) Arguments [0];\r
 533                         if (Arguments.Count > 1)\r
 534                                 named_args = (ArrayList) Arguments [1];\r
 535                         \r
 536 \r
 537                         string dll_name = null;\r
 538                         \r
 539                         Argument tmp = (Argument) pos_args [0];\r
 540 \r
 541                         if (!tmp.Resolve (ec, Location))\r
 542                                 return null;\r
 543                         \r
 544                         if (tmp.Expr is Constant)\r
 545                                 dll_name = (string) ((Constant) tmp.Expr).GetValue ();\r
 546                         else { \r
 547                                 error182 ();\r
 548                                 return null;\r
 549                         }\r
 550 \r
 551                         // Now we process the named arguments\r
 552                         CallingConvention cc = CallingConvention.Winapi;\r
 553                         CharSet charset = CharSet.Ansi;\r
 554                         bool preserve_sig = true;\r
 555                         bool exact_spelling = false;\r
 556                         bool set_last_err = false;\r
 557                         string entry_point = null;\r
 558 \r
 559                         for (int i = 0; i < named_args.Count; i++) {\r
 560 \r
 561                                 DictionaryEntry de = (DictionaryEntry) named_args [i];\r
 562 \r
 563                                 string member_name = (string) de.Key;\r
 564                                 Argument a  = (Argument) de.Value;\r
 565 \r
 566                                 if (!a.Resolve (ec, Location))\r
 567                                         return null;\r
 568 \r
 569                                 Expression member = Expression.MemberLookup (\r
 570                                         ec, Type, member_name, \r
 571                                         MemberTypes.Field | MemberTypes.Property,\r
 572                                         BindingFlags.Public | BindingFlags.Instance,\r
 573                                         Location);\r
 574 \r
 575                                 if (member == null || !(member is FieldExpr)) {\r
 576                                         error617 (member_name);\r
 577                                         return null;\r
 578                                 }\r
 579 \r
 580                                 if (member is FieldExpr) {\r
 581                                         FieldExpr fe = (FieldExpr) member;\r
 582                                         FieldInfo fi = fe.FieldInfo;\r
 583 \r
 584                                         if (fi.IsInitOnly) {\r
 585                                                 error617 (member_name);\r
 586                                                 return null;\r
 587                                         }\r
 588 \r
 589                                         if (a.Expr is Constant) {\r
 590                                                 Constant c = (Constant) a.Expr;\r
 591                                                 \r
 592                                                 if (member_name == "CallingConvention")\r
 593                                                         cc = (CallingConvention) c.GetValue ();\r
 594                                                 else if (member_name == "CharSet")\r
 595                                                         charset = (CharSet) c.GetValue ();\r
 596                                                 else if (member_name == "EntryPoint")\r
 597                                                         entry_point = (string) c.GetValue ();\r
 598                                                 else if (member_name == "SetLastError")\r
 599                                                         set_last_err = (bool) c.GetValue ();\r
 600                                                 else if (member_name == "ExactSpelling")\r
 601                                                         exact_spelling = (bool) c.GetValue ();\r
 602                                                 else if (member_name == "PreserveSig")\r
 603                                                         preserve_sig = (bool) c.GetValue ();\r
 604                                         } else { \r
 605                                                 error182 ();\r
 606                                                 return null;\r
 607                                         }\r
 608                                         \r
 609                                 }\r
 610                         }\r
 611 \r
 612                         MethodBuilder mb = builder.DefinePInvokeMethod (\r
 613                                 name, dll_name, flags | MethodAttributes.HideBySig,\r
 614                                 CallingConventions.Standard,\r
 615                                 ret_type,\r
 616                                 param_types,\r
 617                                 cc,\r
 618                                 charset);\r
 619 \r
 620                         if (preserve_sig)\r
 621                                 mb.SetImplementationFlags (MethodImplAttributes.PreserveSig);\r
 622                         \r
 623                         return mb;\r
 624                 }\r
 625                 \r
 626         }\r
 627         \r
 628         public class AttributeSection {\r
 629                 \r
 630                 public readonly string    Target;\r
 631                 public readonly ArrayList Attributes;\r
 632                 \r
 633                 public AttributeSection (string target, ArrayList attrs)\r
 634                 {\r
 635                         Target = target;\r
 636                         Attributes = attrs;\r
 637                 }\r
 638                 \r
 639         }\r
 640 \r
 641         public class Attributes {\r
 642                 public ArrayList AttributeSections;\r
 643                 public Location Location;\r
 644 \r
 645                 public Attributes (AttributeSection a, Location loc)\r
 646                 {\r
 647                         AttributeSections = new ArrayList ();\r
 648                         AttributeSections.Add (a);\r
 649 \r
 650                 }\r
 651 \r
 652                 public void AddAttribute (AttributeSection a)\r
 653                 {\r
 654                         if (a != null)\r
 655                                 AttributeSections.Add (a);\r
 656                 }\r
 657         }\r
 658 }\r