mcs/gmcs/delegate.cs

   1 // -*- coding: dos -*-\r
   2 //\r
   3 // delegate.cs: Delegate Handler\r
   4 //\r
   5 // Authors:\r
   6 //     Ravi Pratap (ravi@ximian.com)\r
   7 //     Miguel de Icaza (miguel@ximian.com)\r
   8 //\r
   9 // Licensed under the terms of the GNU GPL\r
  10 //\r
  11 // (C) 2001 Ximian, Inc (http://www.ximian.com)\r
  12 //\r
  13 //\r
  14 \r
  15 using System;\r
  16 using System.Collections;\r
  17 using System.Reflection;\r
  18 using System.Reflection.Emit;\r
  19 using System.Text;\r
  20 \r
  21 namespace Mono.CSharp {\r
  22 \r
  23         /// <summary>\r
  24         ///   Holds Delegates\r
  25         /// </summary>\r
  26         public class Delegate : DeclSpace {\r
  27                 public Expression ReturnType;\r
  28                 public Parameters      Parameters;\r
  29 \r
  30                 public ConstructorBuilder ConstructorBuilder;\r
  31                 public MethodBuilder      InvokeBuilder;\r
  32                 public MethodBuilder      BeginInvokeBuilder;\r
  33                 public MethodBuilder      EndInvokeBuilder;\r
  34                 \r
  35                 Type [] param_types;\r
  36                 Type ret_type;\r
  37 \r
  38                 Expression instance_expr;\r
  39                 MethodBase delegate_method;\r
  40         \r
  41                 const int AllowedModifiers =\r
  42                         Modifiers.NEW |\r
  43                         Modifiers.PUBLIC |\r
  44                         Modifiers.PROTECTED |\r
  45                         Modifiers.INTERNAL |\r
  46                         Modifiers.UNSAFE |\r
  47                         Modifiers.PRIVATE;\r
  48 \r
  49                 public Delegate (NamespaceEntry ns, TypeContainer parent, Expression type,\r
  50                                  int mod_flags, string name, Parameters param_list,\r
  51                                  Attributes attrs, Location l)\r
  52                         : base (ns, parent, name, attrs, l)\r
  53 \r
  54                 {\r
  55                         this.ReturnType = type;\r
  56                         ModFlags        = Modifiers.Check (AllowedModifiers, mod_flags,\r
  57                                                            IsTopLevel ? Modifiers.INTERNAL :\r
  58                                                            Modifiers.PRIVATE, l);\r
  59                         Parameters      = param_list;\r
  60                 }\r
  61 \r
  62                 public override TypeBuilder DefineType ()\r
  63                 {\r
  64                         if (TypeBuilder != null)\r
  65                                 return TypeBuilder;\r
  66 \r
  67                         if (IsGeneric) {\r
  68                                 foreach (TypeParameter type_param in TypeParameters)\r
  69                                         if (!type_param.Resolve (this))\r
  70                                                 return null;\r
  71                         }\r
  72                         \r
  73                         TypeAttributes attr = Modifiers.TypeAttr (ModFlags, IsTopLevel) |\r
  74                                 TypeAttributes.Class | TypeAttributes.Sealed;\r
  75 \r
  76                         if (IsTopLevel) {\r
  77                                 if (TypeManager.NamespaceClash (Name, Location))\r
  78                                         return null;\r
  79                                 \r
  80                                 ModuleBuilder builder = CodeGen.Module.Builder;\r
  81 \r
  82                                 TypeBuilder = builder.DefineType (\r
  83                                         Name, attr, TypeManager.multicast_delegate_type);\r
  84                         } else {\r
  85                                 TypeBuilder builder = Parent.TypeBuilder;\r
  86 \r
  87                                 string name = Name.Substring (1 + Name.LastIndexOf ('.'));\r
  88                                 TypeBuilder = builder.DefineNestedType (\r
  89                                         name, attr, TypeManager.multicast_delegate_type);\r
  90                         }\r
  91 \r
  92                         TypeManager.AddDelegateType (Name, TypeBuilder, this);\r
  93 \r
  94                         if (IsGeneric) {\r
  95                                 CurrentType = new ConstructedType (\r
  96                                         Name, TypeParameters, Location);\r
  97 \r
  98                                 foreach (TypeParameter type_param in TypeParameters)\r
  99                                         type_param.Define (TypeBuilder);\r
 100                         }\r
 101 \r
 102                         return TypeBuilder;\r
 103                 }\r
 104 \r
 105                 public override bool DefineMembers (TypeContainer container)\r
 106                 {\r
 107                         return true;\r
 108                 }\r
 109 \r
 110                 public override bool Define (TypeContainer container)\r
 111                 {\r
 112                         MethodAttributes mattr;\r
 113                         int i;\r
 114                         ParameterBuilder pb;\r
 115                         Attributes cattr;\r
 116                         EmitContext ec = new EmitContext (this, this, Location, null,\r
 117                                                           null, ModFlags, false);\r
 118 \r
 119                         if (IsGeneric) {\r
 120                                 foreach (TypeParameter type_param in TypeParameters)\r
 121                                         type_param.DefineType (ec, TypeBuilder);\r
 122                         }\r
 123 \r
 124                         // FIXME: POSSIBLY make this static, as it is always constant\r
 125                         //\r
 126                         Type [] const_arg_types = new Type [2];\r
 127                         const_arg_types [0] = TypeManager.object_type;\r
 128                         const_arg_types [1] = TypeManager.intptr_type;\r
 129 \r
 130                         mattr = MethodAttributes.RTSpecialName | MethodAttributes.SpecialName |\r
 131                                 MethodAttributes.HideBySig | MethodAttributes.Public;\r
 132 \r
 133                         ConstructorBuilder = TypeBuilder.DefineConstructor (mattr,\r
 134                                                                             CallingConventions.Standard,\r
 135                                                                             const_arg_types);\r
 136 \r
 137                         ConstructorBuilder.DefineParameter (1, ParameterAttributes.None, "object");\r
 138                         ConstructorBuilder.DefineParameter (2, ParameterAttributes.None, "method");\r
 139                         //\r
 140                         // HACK because System.Reflection.Emit is lame\r
 141                         //\r
 142                         //\r
 143                         // FIXME: POSSIBLY make these static, as they are always the same\r
 144                         Parameter [] fixed_pars = new Parameter [2];\r
 145                         fixed_pars [0] = new Parameter (null, null, Parameter.Modifier.NONE, null);\r
 146                         fixed_pars [1] = new Parameter (null, null, Parameter.Modifier.NONE, null);\r
 147                         Parameters const_parameters = new Parameters (fixed_pars, null, Location);\r
 148                         \r
 149                         TypeManager.RegisterMethod (\r
 150                                 ConstructorBuilder,\r
 151                                 new InternalParameters (const_arg_types, const_parameters),\r
 152                                 const_arg_types);\r
 153                                 \r
 154                         \r
 155                         ConstructorBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);\r
 156 \r
 157                         //\r
 158                         // Here the various methods like Invoke, BeginInvoke etc are defined\r
 159                         //\r
 160                         // First, call the `out of band' special method for\r
 161                         // defining recursively any types we need:\r
 162                         \r
 163                         if (!Parameters.ComputeAndDefineParameterTypes (this))\r
 164                                 return false;\r
 165                         \r
 166                         param_types = Parameters.GetParameterInfo (this);\r
 167                         if (param_types == null)\r
 168                                 return false;\r
 169 \r
 170                         //\r
 171                         // Invoke method\r
 172                         //\r
 173 \r
 174                         // Check accessibility\r
 175                         foreach (Type partype in param_types){\r
 176                                 if (!container.AsAccessible (partype, ModFlags)) {\r
 177                                         Report.Error (59, Location,\r
 178                                                       "Inconsistent accessibility: parameter type `" +\r
 179                                                       TypeManager.CSharpName (partype) + "` is less " +\r
 180                                                       "accessible than delegate `" + Name + "'");\r
 181                                         return false;\r
 182                                 }\r
 183                                 if (partype.IsPointer && !UnsafeOK (container))\r
 184                                         return false;\r
 185                         }\r
 186                         \r
 187                         ReturnType = ResolveTypeExpr (ReturnType, false, Location);\r
 188                         if (ReturnType == null)\r
 189                             return false;\r
 190                         \r
 191                         ret_type = ReturnType.Type;\r
 192                         if (ret_type == null)\r
 193                                 return false;\r
 194 \r
 195                         if (!container.AsAccessible (ret_type, ModFlags)) {\r
 196                                 Report.Error (58, Location,\r
 197                                               "Inconsistent accessibility: return type `" +\r
 198                                               TypeManager.CSharpName (ret_type) + "` is less " +\r
 199                                               "accessible than delegate `" + Name + "'");\r
 200                                 return false;\r
 201                         }\r
 202 \r
 203                         if (ret_type.IsPointer && !UnsafeOK (container))\r
 204                                 return false;\r
 205 \r
 206                         //\r
 207                         // We don't have to check any others because they are all\r
 208                         // guaranteed to be accessible - they are standard types.\r
 209                         //\r
 210                         \r
 211                         CallingConventions cc = Parameters.GetCallingConvention ();\r
 212 \r
 213                         mattr = MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.Virtual;\r
 214 \r
 215                         InvokeBuilder = TypeBuilder.DefineMethod ("Invoke", \r
 216                                                                   mattr,                     \r
 217                                                                   cc,\r
 218                                                                   ret_type,                  \r
 219                                                                   param_types);\r
 220 \r
 221                         //\r
 222                         // Define parameters, and count out/ref parameters\r
 223                         //\r
 224                         int out_params = 0;\r
 225                         i = 0;\r
 226                         if (Parameters.FixedParameters != null){\r
 227                                 int top = Parameters.FixedParameters.Length;\r
 228                                 Parameter p;\r
 229                                 \r
 230                                 for (; i < top; i++) {\r
 231                                         p = Parameters.FixedParameters [i];\r
 232                                         pb = InvokeBuilder.DefineParameter (i+1, p.Attributes, p.Name);\r
 233                                         cattr = p.OptAttributes;\r
 234                                         if (cattr != null)\r
 235                                                 Attribute.ApplyAttributes (ec, pb, pb, cattr);\r
 236 \r
 237                                         if ((p.ModFlags & Parameter.Modifier.ISBYREF) != 0)\r
 238                                                 out_params++;\r
 239                                 }\r
 240                         }\r
 241                         if (Parameters.ArrayParameter != null){\r
 242                                 Parameter p = Parameters.ArrayParameter;\r
 243                                 \r
 244                                 pb = InvokeBuilder.DefineParameter (\r
 245                                         i+1, p.Attributes, p.Name);\r
 246                                 cattr = p.OptAttributes;\r
 247                                 if (cattr != null)\r
 248                                         Attribute.ApplyAttributes (ec, pb, pb, cattr);\r
 249                         }\r
 250                         \r
 251                         InvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);\r
 252 \r
 253                         TypeManager.RegisterMethod (InvokeBuilder,\r
 254                                                     new InternalParameters (container, Parameters),\r
 255                                                     param_types);\r
 256 \r
 257                         //\r
 258                         // BeginInvoke\r
 259                         //\r
 260                         int params_num = param_types.Length;\r
 261                         Type [] async_param_types = new Type [params_num + 2];\r
 262 \r
 263                         param_types.CopyTo (async_param_types, 0);\r
 264 \r
 265                         async_param_types [params_num] = TypeManager.asynccallback_type;\r
 266                         async_param_types [params_num + 1] = TypeManager.object_type;\r
 267 \r
 268                         mattr = MethodAttributes.Public | MethodAttributes.HideBySig |\r
 269                                 MethodAttributes.Virtual | MethodAttributes.NewSlot;\r
 270                         \r
 271                         BeginInvokeBuilder = TypeBuilder.DefineMethod ("BeginInvoke",\r
 272                                                                        mattr,\r
 273                                                                        cc,\r
 274                                                                        TypeManager.iasyncresult_type,\r
 275                                                                        async_param_types);\r
 276 \r
 277                         i = 0;\r
 278                         if (Parameters.FixedParameters != null){\r
 279                                 int top = Parameters.FixedParameters.Length;\r
 280                                 Parameter p;\r
 281                                 \r
 282                                 for (i = 0 ; i < top; i++) {\r
 283                                         p = Parameters.FixedParameters [i];\r
 284 \r
 285                                         pb = BeginInvokeBuilder.DefineParameter (i+1, p.Attributes, p.Name);\r
 286                                         cattr = p.OptAttributes;\r
 287                                         if (cattr != null)\r
 288                                                 Attribute.ApplyAttributes (ec, pb, pb, cattr);\r
 289                                 }\r
 290                         }\r
 291                         if (Parameters.ArrayParameter != null){\r
 292                                 Parameter p = Parameters.ArrayParameter;\r
 293                                 \r
 294                                 pb = BeginInvokeBuilder.DefineParameter (i+1, p.Attributes, p.Name);\r
 295                                 cattr = p.OptAttributes;\r
 296                                 if (cattr != null)\r
 297                                         Attribute.ApplyAttributes (ec, pb, pb, cattr);\r
 298                                 i++;\r
 299                         }\r
 300 \r
 301                         BeginInvokeBuilder.DefineParameter (i + 1, ParameterAttributes.None, "callback");\r
 302                         BeginInvokeBuilder.DefineParameter (i + 2, ParameterAttributes.None, "object");\r
 303                         \r
 304                         BeginInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);\r
 305 \r
 306                         Parameter [] async_params = new Parameter [params_num + 2];\r
 307                         int n = 0;\r
 308                         if (Parameters.FixedParameters != null){\r
 309                                 Parameters.FixedParameters.CopyTo (async_params, 0);\r
 310                                 n = Parameters.FixedParameters.Length;\r
 311                         }\r
 312                         if (Parameters.ArrayParameter != null)\r
 313                                 async_params [n] = Parameters.ArrayParameter;\r
 314                         \r
 315                         async_params [params_num] = new Parameter (\r
 316                                 TypeManager.system_asynccallback_expr, "callback",\r
 317                                                                    Parameter.Modifier.NONE, null);\r
 318                         async_params [params_num + 1] = new Parameter (\r
 319                                 TypeManager.system_object_expr, "object",\r
 320                                                                    Parameter.Modifier.NONE, null);\r
 321 \r
 322                         Parameters async_parameters = new Parameters (async_params, null, Location);\r
 323                         async_parameters.ComputeAndDefineParameterTypes (this);\r
 324                         \r
 325                         async_parameters.ComputeAndDefineParameterTypes (this);\r
 326                         TypeManager.RegisterMethod (BeginInvokeBuilder,\r
 327                                                     new InternalParameters (container, async_parameters),\r
 328                                                     async_param_types);\r
 329 \r
 330                         //\r
 331                         // EndInvoke is a bit more interesting, all the parameters labeled as\r
 332                         // out or ref have to be duplicated here.\r
 333                         //\r
 334                         \r
 335                         Type [] end_param_types = new Type [out_params + 1];\r
 336                         Parameter [] end_params = new Parameter [out_params + 1];\r
 337                         int param = 0; \r
 338                         if (out_params > 0){\r
 339                                 int top = Parameters.FixedParameters.Length;\r
 340                                 for (i = 0; i < top; i++){\r
 341                                         Parameter p = Parameters.FixedParameters [i];\r
 342                                         if ((p.ModFlags & Parameter.Modifier.ISBYREF) == 0)\r
 343                                                 continue;\r
 344 \r
 345                                         end_param_types [param] = param_types [i];\r
 346                                         end_params [param] = p;\r
 347                                         param++;\r
 348                                 }\r
 349                         }\r
 350                         end_param_types [out_params] = TypeManager.iasyncresult_type;\r
 351                         end_params [out_params] = new Parameter (TypeManager.system_iasyncresult_expr, "result", Parameter.Modifier.NONE, null);\r
 352 \r
 353                         //\r
 354                         // Create method, define parameters, register parameters with type system\r
 355                         //\r
 356                         EndInvokeBuilder = TypeBuilder.DefineMethod ("EndInvoke", mattr, cc, ret_type, end_param_types);\r
 357                         EndInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);\r
 358 \r
 359                         //\r
 360                         // EndInvoke: Label the parameters\r
 361                         //\r
 362                         EndInvokeBuilder.DefineParameter (out_params + 1, ParameterAttributes.None, "result");\r
 363                         for (i = 0; i < end_params.Length-1; i++){\r
 364                                 EndInvokeBuilder.DefineParameter (i + 1, end_params [i].Attributes, end_params [i].Name);\r
 365                         }\r
 366 \r
 367                         Parameters end_parameters = new Parameters (end_params, null, Location);\r
 368                         end_parameters.ComputeAndDefineParameterTypes (this);\r
 369 \r
 370                         TypeManager.RegisterMethod (\r
 371                                 EndInvokeBuilder,\r
 372                                 new InternalParameters (container, end_parameters),\r
 373                                 end_param_types);\r
 374 \r
 375                         Attribute.ApplyAttributes (ec, TypeBuilder, this, OptAttributes);\r
 376                         return true;\r
 377                 }\r
 378 \r
 379                 /// <summary>\r
 380                 ///  Verifies whether the method in question is compatible with the delegate\r
 381                 ///  Returns the method itself if okay and null if not.\r
 382                 /// </summary>\r
 383                 public static MethodBase VerifyMethod (EmitContext ec, Type delegate_type,\r
 384                                                        MethodGroupExpr mg, MethodBase mb,\r
 385                                                        Location loc)\r
 386                 {\r
 387                         Expression ml = Expression.MemberLookup (\r
 388                                 ec, delegate_type, "Invoke", loc);\r
 389 \r
 390                         if (!(ml is MethodGroupExpr)) {\r
 391                                 Report.Error (-100, loc, "Internal error: could not find Invoke method!");\r
 392                                 return null;\r
 393                         }\r
 394 \r
 395                         MethodBase invoke_mb = ((MethodGroupExpr) ml).Methods [0];\r
 396                         ParameterData invoke_pd = Invocation.GetParameterData (invoke_mb);\r
 397 \r
 398                         if (!mg.HasTypeArguments &&\r
 399                             !Invocation.InferTypeArguments (ec, invoke_pd, ref mb))\r
 400                                 return null;\r
 401 \r
 402                         ParameterData pd = Invocation.GetParameterData (mb);\r
 403                         int pd_count = pd.Count;\r
 404 \r
 405                         if (invoke_pd.Count != pd_count)\r
 406                                 return null;\r
 407 \r
 408                         for (int i = pd_count; i > 0; ) {\r
 409                                 i--;\r
 410 \r
 411                                 if (invoke_pd.ParameterType (i) == pd.ParameterType (i) &&\r
 412                                     invoke_pd.ParameterModifier (i) == pd.ParameterModifier (i))\r
 413                                         continue;\r
 414                                 else {\r
 415                                         return null;\r
 416                                 }\r
 417                         }\r
 418 \r
 419                         if (((MethodInfo) invoke_mb).ReturnType == ((MethodInfo) mb).ReturnType)\r
 420                                 return mb;\r
 421                         else\r
 422                                 return null;\r
 423                 }\r
 424 \r
 425                 // <summary>\r
 426                 //  Verifies whether the invocation arguments are compatible with the\r
 427                 //  delegate's target method\r
 428                 // </summary>\r
 429                 public static bool VerifyApplicability (EmitContext ec,\r
 430                                                         Type delegate_type,\r
 431                                                         ArrayList args,\r
 432                                                         Location loc)\r
 433                 {\r
 434                         int arg_count;\r
 435 \r
 436                         if (args == null)\r
 437                                 arg_count = 0;\r
 438                         else\r
 439                                 arg_count = args.Count;\r
 440 \r
 441                         Expression ml = Expression.MemberLookup (\r
 442                                 ec, delegate_type, "Invoke", loc);\r
 443 \r
 444                         if (!(ml is MethodGroupExpr)) {\r
 445                                 Report.Error (-100, loc, "Internal error: could not find Invoke method!" + delegate_type);\r
 446                                 return false;\r
 447                         }\r
 448                         \r
 449                         MethodBase mb = ((MethodGroupExpr) ml).Methods [0];\r
 450                         ParameterData pd = Invocation.GetParameterData (mb);\r
 451 \r
 452                         int pd_count = pd.Count;\r
 453 \r
 454                         bool not_params_method = (pd_count == 0) ||\r
 455                                 (pd.ParameterModifier (pd_count - 1) != Parameter.Modifier.PARAMS);\r
 456 \r
 457                         if (not_params_method && pd_count != arg_count) {\r
 458                                 Report.Error (1593, loc,\r
 459                                               "Delegate '" + delegate_type.ToString ()\r
 460                                               + "' does not take '" + arg_count + "' arguments");\r
 461                                 return false;\r
 462                         }\r
 463 \r
 464                         return Invocation.VerifyArgumentsCompat (ec, args, arg_count, mb, !not_params_method,\r
 465                                                                  delegate_type, loc);\r
 466                 }\r
 467                 \r
 468                 /// <summary>\r
 469                 ///  Verifies whether the delegate in question is compatible with this one in\r
 470                 ///  order to determine if instantiation from the same is possible.\r
 471                 /// </summary>\r
 472                 public static bool VerifyDelegate (EmitContext ec, Type delegate_type, Type probe_type, Location loc)\r
 473                 {\r
 474                         Expression ml = Expression.MemberLookup (\r
 475                                 ec, delegate_type, "Invoke", loc);\r
 476                         \r
 477                         if (!(ml is MethodGroupExpr)) {\r
 478                                 Report.Error (-100, loc, "Internal error: could not find Invoke method!");\r
 479                                 return false;\r
 480                         }\r
 481                         \r
 482                         MethodBase mb = ((MethodGroupExpr) ml).Methods [0];\r
 483                         ParameterData pd = Invocation.GetParameterData (mb);\r
 484 \r
 485                         Expression probe_ml = Expression.MemberLookup (\r
 486                                 ec, delegate_type, "Invoke", loc);\r
 487                         \r
 488                         if (!(probe_ml is MethodGroupExpr)) {\r
 489                                 Report.Error (-100, loc, "Internal error: could not find Invoke method!");\r
 490                                 return false;\r
 491                         }\r
 492                         \r
 493                         MethodBase probe_mb = ((MethodGroupExpr) probe_ml).Methods [0];\r
 494                         ParameterData probe_pd = Invocation.GetParameterData (probe_mb);\r
 495                         \r
 496                         if (((MethodInfo) mb).ReturnType != ((MethodInfo) probe_mb).ReturnType)\r
 497                                 return false;\r
 498 \r
 499                         if (pd.Count != probe_pd.Count)\r
 500                                 return false;\r
 501 \r
 502                         for (int i = pd.Count; i > 0; ) {\r
 503                                 i--;\r
 504 \r
 505                                 if (pd.ParameterType (i) != probe_pd.ParameterType (i) ||\r
 506                                     pd.ParameterModifier (i) != probe_pd.ParameterModifier (i))\r
 507                                         return false;\r
 508                         }\r
 509                         \r
 510                         return true;\r
 511                 }\r
 512                 \r
 513                 public static string FullDelegateDesc (Type del_type, MethodBase mb, ParameterData pd)\r
 514                 {\r
 515                         StringBuilder sb = new StringBuilder (TypeManager.CSharpName (((MethodInfo) mb).ReturnType));\r
 516                         \r
 517                         sb.Append (" " + del_type.ToString ());\r
 518                         sb.Append (" (");\r
 519 \r
 520                         int length = pd.Count;\r
 521                         \r
 522                         for (int i = length; i > 0; ) {\r
 523                                 i--;\r
 524 \r
 525                                 sb.Append (pd.ParameterDesc (length - i - 1));\r
 526                                 if (i != 0)\r
 527                                         sb.Append (", ");\r
 528                         }\r
 529                         \r
 530                         sb.Append (")");\r
 531                         return sb.ToString ();\r
 532                         \r
 533                 }\r
 534                 \r
 535                 // Hack around System.Reflection as found everywhere else\r
 536                 public override MemberList FindMembers (MemberTypes mt, BindingFlags bf,\r
 537                                                         MemberFilter filter, object criteria)\r
 538                 {\r
 539                         ArrayList members = new ArrayList ();\r
 540 \r
 541                         if ((mt & MemberTypes.Method) != 0) {\r
 542                                 if (ConstructorBuilder != null)\r
 543                                 if (filter (ConstructorBuilder, criteria))\r
 544                                         members.Add (ConstructorBuilder);\r
 545 \r
 546                                 if (InvokeBuilder != null)\r
 547                                 if (filter (InvokeBuilder, criteria))\r
 548                                         members.Add (InvokeBuilder);\r
 549 \r
 550                                 if (BeginInvokeBuilder != null)\r
 551                                 if (filter (BeginInvokeBuilder, criteria))\r
 552                                         members.Add (BeginInvokeBuilder);\r
 553 \r
 554                                 if (EndInvokeBuilder != null)\r
 555                                 if (filter (EndInvokeBuilder, criteria))\r
 556                                         members.Add (EndInvokeBuilder);\r
 557                         }\r
 558 \r
 559                         return new MemberList (members);\r
 560                 }\r
 561 \r
 562                 public override MemberCache MemberCache {\r
 563                         get {\r
 564                                 return null;\r
 565                         }\r
 566                 }\r
 567 \r
 568                 public Expression InstanceExpression {\r
 569                         get {\r
 570                                 return instance_expr;\r
 571                         }\r
 572                         set {\r
 573                                 instance_expr = value;\r
 574                         }\r
 575                 }\r
 576 \r
 577                 public MethodBase TargetMethod {\r
 578                         get {\r
 579                                 return delegate_method;\r
 580                         }\r
 581                         set {\r
 582                                 delegate_method = value;\r
 583                         }\r
 584                 }\r
 585 \r
 586                 public Type TargetReturnType {\r
 587                         get {\r
 588                                 return ret_type;\r
 589                         }\r
 590                 }\r
 591 \r
 592                 public Type [] ParameterTypes {\r
 593                         get {\r
 594                                 return param_types;\r
 595                         }\r
 596                 }\r
 597                 \r
 598         }\r
 599 \r
 600         //\r
 601         // Base class for `NewDelegate' and `ImplicitDelegateCreation'\r
 602         //\r
 603         public abstract class DelegateCreation : Expression {\r
 604                 protected MethodBase constructor_method;\r
 605                 protected MethodBase delegate_method;\r
 606                 protected Expression delegate_instance_expr;\r
 607 \r
 608                 public DelegateCreation () {}\r
 609 \r
 610                 public static void Error_NoMatchingMethodForDelegate (EmitContext ec, MethodGroupExpr mg, Type type, Location loc)\r
 611                 {\r
 612                         string method_desc;\r
 613 \r
 614                         MethodBase candidate = mg.Methods [0];\r
 615                         if (mg.Methods.Length > 1)\r
 616                                 method_desc = candidate.Name;\r
 617                         else\r
 618                                 method_desc = Invocation.FullMethodDesc (candidate);\r
 619 \r
 620                         Expression invoke_method = Expression.MemberLookup (\r
 621                                 ec, type, "Invoke", MemberTypes.Method,\r
 622                                 Expression.AllBindingFlags, loc);\r
 623                         MethodBase method = ((MethodGroupExpr) invoke_method).Methods [0];\r
 624                         ParameterData param = Invocation.GetParameterData (method);\r
 625                         string delegate_desc = Delegate.FullDelegateDesc (type, method, param);\r
 626 \r
 627                         if (!mg.HasTypeArguments &&\r
 628                             !Invocation.InferTypeArguments (ec, param, ref candidate))\r
 629                                 Report.Error (411, loc, "The type arguments for " +\r
 630                                               "method `{0}' cannot be infered from " +\r
 631                                               "the usage. Try specifying the type " +\r
 632                                               "arguments explicitly.", method_desc);\r
 633                         else\r
 634                                 Report.Error (123, loc, "Method '{0}' does not " +\r
 635                                               "match delegate '{1}'", method_desc,\r
 636                                               delegate_desc);\r
 637                 }\r
 638 \r
 639                 public override void Emit (EmitContext ec)\r
 640                 {\r
 641                         if (delegate_instance_expr == null ||\r
 642                             delegate_method.IsStatic)\r
 643                                 ec.ig.Emit (OpCodes.Ldnull);\r
 644                         else\r
 645                                 delegate_instance_expr.Emit (ec);\r
 646                         \r
 647                         if (delegate_method.IsVirtual) {\r
 648                                 ec.ig.Emit (OpCodes.Dup);\r
 649                                 ec.ig.Emit (OpCodes.Ldvirtftn, (MethodInfo) delegate_method);\r
 650                         } else\r
 651                                 ec.ig.Emit (OpCodes.Ldftn, (MethodInfo) delegate_method);\r
 652                         ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) constructor_method);\r
 653                 }\r
 654 \r
 655                 protected bool ResolveConstructorMethod (EmitContext ec)\r
 656                 {\r
 657                         Expression ml = Expression.MemberLookup (\r
 658                                 ec, type, ".ctor", loc);\r
 659 \r
 660                         if (!(ml is MethodGroupExpr)) {\r
 661                                 Report.Error (-100, loc, "Internal error: Could not find delegate constructor!");\r
 662                                 return false;\r
 663                         }\r
 664 \r
 665                         constructor_method = ((MethodGroupExpr) ml).Methods [0];\r
 666                         return true;\r
 667                 }\r
 668 \r
 669                 protected Expression ResolveMethodGroupExpr (EmitContext ec, MethodGroupExpr mg)\r
 670                 {\r
 671                                 foreach (MethodInfo mi in mg.Methods){\r
 672                                         delegate_method = Delegate.VerifyMethod (\r
 673                                                 ec, type, mg, mi, loc);\r
 674 \r
 675                                         if (delegate_method != null)\r
 676                                                 break;\r
 677                                 }\r
 678                                         \r
 679                                 if (delegate_method == null) {\r
 680                                         Error_NoMatchingMethodForDelegate (ec, mg, type, loc);\r
 681                                         return null;\r
 682                                 }\r
 683 \r
 684                                 //\r
 685                                 // Check safe/unsafe of the delegate\r
 686                                 //\r
 687                                 if (!ec.InUnsafe){\r
 688                                         ParameterData param = Invocation.GetParameterData (delegate_method);\r
 689                                         int count = param.Count;\r
 690                                         \r
 691                                         for (int i = 0; i < count; i++){\r
 692                                                 if (param.ParameterType (i).IsPointer){\r
 693                                                         Expression.UnsafeError (loc);\r
 694                                                         return null;\r
 695                                                 }\r
 696                                         }\r
 697                                 }\r
 698                                                 \r
 699                                 if (mg.InstanceExpression != null)\r
 700                                         delegate_instance_expr = mg.InstanceExpression.Resolve (ec);\r
 701                                 else {\r
 702                                         if (ec.IsStatic){\r
 703                                                 if (!delegate_method.IsStatic){\r
 704                                                         Report.Error (120, loc,\r
 705                                                                       "An object reference is required for the non-static method " +\r
 706                                                                       delegate_method.Name);\r
 707                                                         return null;\r
 708                                                 }\r
 709                                                 delegate_instance_expr = null;\r
 710                                         } else\r
 711                                                 delegate_instance_expr = ec.GetThis (loc);\r
 712                                 }\r
 713 \r
 714                                 if (delegate_instance_expr != null)\r
 715                                         if (delegate_instance_expr.Type.IsValueType)\r
 716                                                 delegate_instance_expr = new BoxedCast (delegate_instance_expr);\r
 717                                 \r
 718                                 eclass = ExprClass.Value;\r
 719                                 return this;\r
 720                         }\r
 721         }\r
 722 \r
 723         //\r
 724         // Created from the conversion code\r
 725         //\r
 726         public class ImplicitDelegateCreation : DelegateCreation {\r
 727 \r
 728                 ImplicitDelegateCreation (Type t, Location l)\r
 729                 {\r
 730                         type = t;\r
 731                         loc = l;\r
 732                 }\r
 733 \r
 734                 public override Expression DoResolve (EmitContext ec)\r
 735                 {\r
 736                         return this;\r
 737                 }\r
 738                 \r
 739                 static public Expression Create (EmitContext ec, MethodGroupExpr mge, Type target_type, Location loc)\r
 740                 {\r
 741                         ImplicitDelegateCreation d = new ImplicitDelegateCreation (target_type, loc);\r
 742                         if (d.ResolveConstructorMethod (ec))\r
 743                                 return d.ResolveMethodGroupExpr (ec, mge);\r
 744                         else\r
 745                                 return null;\r
 746                 }\r
 747         }\r
 748         \r
 749         //\r
 750         // A delegate-creation-expression, invoked from the `New' class \r
 751         //\r
 752         public class NewDelegate : DelegateCreation {\r
 753                 public ArrayList Arguments;\r
 754 \r
 755                 //\r
 756                 // This constructor is invoked from the `New' expression\r
 757                 //\r
 758                 public NewDelegate (Type type, ArrayList Arguments, Location loc)\r
 759                 {\r
 760                         this.type = type;\r
 761                         this.Arguments = Arguments;\r
 762                         this.loc  = loc; \r
 763                 }\r
 764 \r
 765                 public override Expression DoResolve (EmitContext ec)\r
 766                 {\r
 767                         if (Arguments == null || Arguments.Count != 1) {\r
 768                                 Report.Error (149, loc,\r
 769                                               "Method name expected");\r
 770                                 return null;\r
 771                         }\r
 772 \r
 773                         if (!ResolveConstructorMethod (ec))\r
 774                                 return null;\r
 775 \r
 776                         Argument a = (Argument) Arguments [0];\r
 777 \r
 778                         Expression invoke_method = Expression.MemberLookup (\r
 779                                 ec, type, "Invoke", MemberTypes.Method,\r
 780                                 Expression.AllBindingFlags, loc);\r
 781 \r
 782                         if (invoke_method == null) {\r
 783                                 Report.Error (-200, loc, "Internal error ! Could not find Invoke method!");\r
 784                                 return null;\r
 785                         }\r
 786 \r
 787                         if (!a.ResolveMethodGroup (ec, loc))\r
 788                                 return null;\r
 789                         \r
 790                         Expression e = a.Expr;\r
 791 \r
 792                         MethodGroupExpr mg = e as MethodGroupExpr;\r
 793                         if (mg != null)\r
 794                                 return ResolveMethodGroupExpr (ec, mg);\r
 795 \r
 796                         Type e_type = e.Type;\r
 797 \r
 798                         if (!TypeManager.IsDelegateType (e_type)) {\r
 799                                 e.Error_UnexpectedKind ("method");\r
 800                                 return null;\r
 801                         }\r
 802 \r
 803                         // This is what MS' compiler reports. We could always choose\r
 804                         // to be more verbose and actually give delegate-level specifics\r
 805                         \r
 806                         if (!Delegate.VerifyDelegate (ec, type, e_type, loc)) {\r
 807                                 Report.Error (29, loc, "Cannot implicitly convert type '" + e_type + "' " +\r
 808                                               "to type '" + type + "'");\r
 809                                 return null;\r
 810                         }\r
 811                                 \r
 812                         delegate_instance_expr = e;\r
 813                         delegate_method = ((MethodGroupExpr) invoke_method).Methods [0];\r
 814                         \r
 815                         eclass = ExprClass.Value;\r
 816                         return this;\r
 817                 }\r
 818                 \r
 819                 public override void Emit (EmitContext ec)\r
 820                 {\r
 821                         if (delegate_instance_expr == null || delegate_method.IsStatic)\r
 822                                 ec.ig.Emit (OpCodes.Ldnull);\r
 823                         else\r
 824                                 delegate_instance_expr.Emit (ec);\r
 825                         \r
 826                         if (delegate_method.IsVirtual) {\r
 827                                 ec.ig.Emit (OpCodes.Dup);\r
 828                                 ec.ig.Emit (OpCodes.Ldvirtftn, (MethodInfo) delegate_method);\r
 829                         } else\r
 830                                 ec.ig.Emit (OpCodes.Ldftn, (MethodInfo) delegate_method);\r
 831                         ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) constructor_method);\r
 832                 }\r
 833         }\r
 834 \r
 835         public class DelegateInvocation : ExpressionStatement {\r
 836 \r
 837                 public Expression InstanceExpr;\r
 838                 public ArrayList  Arguments;\r
 839 \r
 840                 MethodBase method;\r
 841                 \r
 842                 public DelegateInvocation (Expression instance_expr, ArrayList args, Location loc)\r
 843                 {\r
 844                         this.InstanceExpr = instance_expr;\r
 845                         this.Arguments = args;\r
 846                         this.loc = loc;\r
 847                 }\r
 848 \r
 849                 public override Expression DoResolve (EmitContext ec)\r
 850                 {\r
 851                         if (InstanceExpr is EventExpr) {\r
 852                                 \r
 853                                 EventInfo ei = ((EventExpr) InstanceExpr).EventInfo;\r
 854                                 \r
 855                                 Expression ml = MemberLookup (\r
 856                                         ec, ec.ContainerType, ei.Name,\r
 857                                         MemberTypes.Event, AllBindingFlags | BindingFlags.DeclaredOnly, loc);\r
 858 \r
 859                                 if (ml == null) {\r
 860                                         //\r
 861                                         // If this is the case, then the Event does not belong \r
 862                                         // to this Type and so, according to the spec\r
 863                                         // cannot be accessed directly\r
 864                                         //\r
 865                                         // Note that target will not appear as an EventExpr\r
 866                                         // in the case it is being referenced within the same type container;\r
 867                                         // it will appear as a FieldExpr in that case.\r
 868                                         //\r
 869                                         \r
 870                                         Assign.error70 (ei, loc);\r
 871                                         return null;\r
 872                                 }\r
 873                         }\r
 874                         \r
 875                         \r
 876                         Type del_type = InstanceExpr.Type;\r
 877                         if (del_type == null)\r
 878                                 return null;\r
 879                         \r
 880                         if (Arguments != null){\r
 881                                 foreach (Argument a in Arguments){\r
 882                                         if (!a.Resolve (ec, loc))\r
 883                                                 return null;\r
 884                                 }\r
 885                         }\r
 886                         \r
 887                         if (!Delegate.VerifyApplicability (ec, del_type, Arguments, loc))\r
 888                                 return null;\r
 889 \r
 890                         Expression lookup = Expression.MemberLookup (ec, del_type, "Invoke", loc);\r
 891                         if (!(lookup is MethodGroupExpr)) {\r
 892                                 Report.Error (-100, loc, "Internal error: could not find Invoke method!");\r
 893                                 return null;\r
 894                         }\r
 895                         \r
 896                         method = ((MethodGroupExpr) lookup).Methods [0];\r
 897                         type = ((MethodInfo) method).ReturnType;\r
 898                         eclass = ExprClass.Value;\r
 899                         \r
 900                         return this;\r
 901                 }\r
 902 \r
 903                 public override void Emit (EmitContext ec)\r
 904                 {\r
 905                         //\r
 906                         // Invocation on delegates call the virtual Invoke member\r
 907                         // so we are always `instance' calls\r
 908                         //\r
 909                         Invocation.EmitCall (ec, false, false, InstanceExpr, method, Arguments, loc);\r
 910                 }\r
 911 \r
 912                 public override void EmitStatement (EmitContext ec)\r
 913                 {\r
 914                         Emit (ec);\r
 915                         // \r
 916                         // Pop the return value if there is one\r
 917                         //\r
 918                         if (method is MethodInfo){\r
 919                                 if (((MethodInfo) method).ReturnType != TypeManager.void_type)\r
 920                                         ec.ig.Emit (OpCodes.Pop);\r
 921                         }\r
 922                 }\r
 923 \r
 924         }\r
 925 }\r