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                 MemberName MemberName;\r
  39                 \r
  40                 Expression instance_expr;\r
  41                 MethodBase delegate_method;\r
  42         \r
  43                 const int AllowedModifiers =\r
  44                         Modifiers.NEW |\r
  45                         Modifiers.PUBLIC |\r
  46                         Modifiers.PROTECTED |\r
  47                         Modifiers.INTERNAL |\r
  48                         Modifiers.UNSAFE |\r
  49                         Modifiers.PRIVATE;\r
  50 \r
  51                 public Delegate (NamespaceEntry ns, TypeContainer parent, Expression type,\r
  52                                  int mod_flags, MemberName name, Parameters param_list,\r
  53                                  Attributes attrs, Location l)\r
  54                         : base (ns, parent, name.GetMemberName (), attrs, l)\r
  55 \r
  56                 {\r
  57                         this.ReturnType = type;\r
  58                         this.MemberName = name;\r
  59                         ModFlags        = Modifiers.Check (AllowedModifiers, mod_flags,\r
  60                                                            IsTopLevel ? Modifiers.INTERNAL :\r
  61                                                            Modifiers.PRIVATE, l);\r
  62                         Parameters      = param_list;\r
  63                 }\r
  64 \r
  65                 public override TypeBuilder DefineType ()\r
  66                 {\r
  67                         if (TypeBuilder != null)\r
  68                                 return TypeBuilder;\r
  69 \r
  70                         if (IsGeneric) {\r
  71                                 foreach (TypeParameter type_param in TypeParameters)\r
  72                                         if (!type_param.Resolve (this))\r
  73                                                 return null;\r
  74                         }\r
  75                         \r
  76                         TypeAttributes attr = Modifiers.TypeAttr (ModFlags, IsTopLevel) |\r
  77                                 TypeAttributes.Class | TypeAttributes.Sealed;\r
  78 \r
  79                         if (IsTopLevel) {\r
  80                                 if (TypeManager.NamespaceClash (Name, Location))\r
  81                                         return null;\r
  82                                 \r
  83                                 ModuleBuilder builder = CodeGen.Module.Builder;\r
  84 \r
  85                                 TypeBuilder = builder.DefineType (\r
  86                                         Name, attr, TypeManager.multicast_delegate_type);\r
  87                         } else {\r
  88                                 TypeBuilder builder = Parent.TypeBuilder;\r
  89 \r
  90                                 string name = Name.Substring (1 + Name.LastIndexOf ('.'));\r
  91                                 TypeBuilder = builder.DefineNestedType (\r
  92                                         name, attr, TypeManager.multicast_delegate_type);\r
  93                         }\r
  94 \r
  95                         TypeManager.AddDelegateType (Name, TypeBuilder, this);\r
  96 \r
  97                         if (IsGeneric) {\r
  98                                 CurrentType = new ConstructedType (\r
  99                                         Name, TypeParameters, Location);\r
 100 \r
 101                                 foreach (TypeParameter type_param in TypeParameters)\r
 102                                         type_param.Define (TypeBuilder);\r
 103                         }\r
 104 \r
 105                         return TypeBuilder;\r
 106                 }\r
 107 \r
 108                 public override bool DefineMembers (TypeContainer container)\r
 109                 {\r
 110                         return true;\r
 111                 }\r
 112 \r
 113                 public override bool Define (TypeContainer container)\r
 114                 {\r
 115                         MethodAttributes mattr;\r
 116                         int i;\r
 117                         ParameterBuilder pb;\r
 118                         Attributes cattr;\r
 119                         EmitContext ec = new EmitContext (this, this, Location, null,\r
 120                                                           null, ModFlags, false);\r
 121 \r
 122                         if (IsGeneric) {\r
 123                                 foreach (TypeParameter type_param in TypeParameters)\r
 124                                         type_param.DefineType (ec, TypeBuilder);\r
 125                         }\r
 126 \r
 127                         // FIXME: POSSIBLY make this static, as it is always constant\r
 128                         //\r
 129                         Type [] const_arg_types = new Type [2];\r
 130                         const_arg_types [0] = TypeManager.object_type;\r
 131                         const_arg_types [1] = TypeManager.intptr_type;\r
 132 \r
 133                         mattr = MethodAttributes.RTSpecialName | MethodAttributes.SpecialName |\r
 134                                 MethodAttributes.HideBySig | MethodAttributes.Public;\r
 135 \r
 136                         ConstructorBuilder = TypeBuilder.DefineConstructor (mattr,\r
 137                                                                             CallingConventions.Standard,\r
 138                                                                             const_arg_types);\r
 139 \r
 140                         ConstructorBuilder.DefineParameter (1, ParameterAttributes.None, "object");\r
 141                         ConstructorBuilder.DefineParameter (2, ParameterAttributes.None, "method");\r
 142                         //\r
 143                         // HACK because System.Reflection.Emit is lame\r
 144                         //\r
 145                         //\r
 146                         // FIXME: POSSIBLY make these static, as they are always the same\r
 147                         Parameter [] fixed_pars = new Parameter [2];\r
 148                         fixed_pars [0] = new Parameter (null, null, Parameter.Modifier.NONE, null);\r
 149                         fixed_pars [1] = new Parameter (null, null, Parameter.Modifier.NONE, null);\r
 150                         Parameters const_parameters = new Parameters (fixed_pars, null, Location);\r
 151                         \r
 152                         TypeManager.RegisterMethod (\r
 153                                 ConstructorBuilder,\r
 154                                 new InternalParameters (const_arg_types, const_parameters),\r
 155                                 const_arg_types);\r
 156                                 \r
 157                         \r
 158                         ConstructorBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);\r
 159 \r
 160                         //\r
 161                         // Here the various methods like Invoke, BeginInvoke etc are defined\r
 162                         //\r
 163                         // First, call the `out of band' special method for\r
 164                         // defining recursively any types we need:\r
 165                         \r
 166                         if (!Parameters.ComputeAndDefineParameterTypes (this))\r
 167                                 return false;\r
 168                         \r
 169                         param_types = Parameters.GetParameterInfo (this);\r
 170                         if (param_types == null)\r
 171                                 return false;\r
 172 \r
 173                         //\r
 174                         // Invoke method\r
 175                         //\r
 176 \r
 177                         // Check accessibility\r
 178                         foreach (Type partype in param_types){\r
 179                                 if (!container.AsAccessible (partype, ModFlags)) {\r
 180                                         Report.Error (59, Location,\r
 181                                                       "Inconsistent accessibility: parameter type `" +\r
 182                                                       TypeManager.CSharpName (partype) + "` is less " +\r
 183                                                       "accessible than delegate `" + Name + "'");\r
 184                                         return false;\r
 185                                 }\r
 186                                 if (partype.IsPointer && !UnsafeOK (container))\r
 187                                         return false;\r
 188                         }\r
 189                         \r
 190                         ReturnType = ResolveTypeExpr (ReturnType, false, Location);\r
 191                         if (ReturnType == null)\r
 192                             return false;\r
 193                         \r
 194                         ret_type = ReturnType.Type;\r
 195                         if (ret_type == null)\r
 196                                 return false;\r
 197 \r
 198                         if (!container.AsAccessible (ret_type, ModFlags)) {\r
 199                                 Report.Error (58, Location,\r
 200                                               "Inconsistent accessibility: return type `" +\r
 201                                               TypeManager.CSharpName (ret_type) + "` is less " +\r
 202                                               "accessible than delegate `" + Name + "'");\r
 203                                 return false;\r
 204                         }\r
 205 \r
 206                         if (ret_type.IsPointer && !UnsafeOK (container))\r
 207                                 return false;\r
 208 \r
 209                         //\r
 210                         // We don't have to check any others because they are all\r
 211                         // guaranteed to be accessible - they are standard types.\r
 212                         //\r
 213                         \r
 214                         CallingConventions cc = Parameters.GetCallingConvention ();\r
 215 \r
 216                         mattr = MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.Virtual;\r
 217 \r
 218                         InvokeBuilder = TypeBuilder.DefineMethod ("Invoke", \r
 219                                                                   mattr,                     \r
 220                                                                   cc,\r
 221                                                                   ret_type,                  \r
 222                                                                   param_types);\r
 223 \r
 224                         //\r
 225                         // Define parameters, and count out/ref parameters\r
 226                         //\r
 227                         int out_params = 0;\r
 228                         i = 0;\r
 229                         if (Parameters.FixedParameters != null){\r
 230                                 int top = Parameters.FixedParameters.Length;\r
 231                                 Parameter p;\r
 232                                 \r
 233                                 for (; i < top; i++) {\r
 234                                         p = Parameters.FixedParameters [i];\r
 235                                         pb = InvokeBuilder.DefineParameter (i+1, p.Attributes, p.Name);\r
 236                                         cattr = p.OptAttributes;\r
 237                                         if (cattr != null)\r
 238                                                 Attribute.ApplyAttributes (ec, pb, pb, cattr);\r
 239 \r
 240                                         if ((p.ModFlags & Parameter.Modifier.ISBYREF) != 0)\r
 241                                                 out_params++;\r
 242                                 }\r
 243                         }\r
 244                         if (Parameters.ArrayParameter != null){\r
 245                                 Parameter p = Parameters.ArrayParameter;\r
 246                                 \r
 247                                 pb = InvokeBuilder.DefineParameter (\r
 248                                         i+1, p.Attributes, p.Name);\r
 249                                 cattr = p.OptAttributes;\r
 250                                 if (cattr != null)\r
 251                                         Attribute.ApplyAttributes (ec, pb, pb, cattr);\r
 252                         }\r
 253                         \r
 254                         InvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);\r
 255 \r
 256                         TypeManager.RegisterMethod (InvokeBuilder,\r
 257                                                     new InternalParameters (container, Parameters),\r
 258                                                     param_types);\r
 259 \r
 260                         //\r
 261                         // BeginInvoke\r
 262                         //\r
 263                         int params_num = param_types.Length;\r
 264                         Type [] async_param_types = new Type [params_num + 2];\r
 265 \r
 266                         param_types.CopyTo (async_param_types, 0);\r
 267 \r
 268                         async_param_types [params_num] = TypeManager.asynccallback_type;\r
 269                         async_param_types [params_num + 1] = TypeManager.object_type;\r
 270 \r
 271                         mattr = MethodAttributes.Public | MethodAttributes.HideBySig |\r
 272                                 MethodAttributes.Virtual | MethodAttributes.NewSlot;\r
 273                         \r
 274                         BeginInvokeBuilder = TypeBuilder.DefineMethod ("BeginInvoke",\r
 275                                                                        mattr,\r
 276                                                                        cc,\r
 277                                                                        TypeManager.iasyncresult_type,\r
 278                                                                        async_param_types);\r
 279 \r
 280                         i = 0;\r
 281                         if (Parameters.FixedParameters != null){\r
 282                                 int top = Parameters.FixedParameters.Length;\r
 283                                 Parameter p;\r
 284                                 \r
 285                                 for (i = 0 ; i < top; i++) {\r
 286                                         p = Parameters.FixedParameters [i];\r
 287 \r
 288                                         pb = BeginInvokeBuilder.DefineParameter (i+1, p.Attributes, p.Name);\r
 289                                         cattr = p.OptAttributes;\r
 290                                         if (cattr != null)\r
 291                                                 Attribute.ApplyAttributes (ec, pb, pb, cattr);\r
 292                                 }\r
 293                         }\r
 294                         if (Parameters.ArrayParameter != null){\r
 295                                 Parameter p = Parameters.ArrayParameter;\r
 296                                 \r
 297                                 pb = BeginInvokeBuilder.DefineParameter (i+1, p.Attributes, p.Name);\r
 298                                 cattr = p.OptAttributes;\r
 299                                 if (cattr != null)\r
 300                                         Attribute.ApplyAttributes (ec, pb, pb, cattr);\r
 301                                 i++;\r
 302                         }\r
 303 \r
 304                         BeginInvokeBuilder.DefineParameter (i + 1, ParameterAttributes.None, "callback");\r
 305                         BeginInvokeBuilder.DefineParameter (i + 2, ParameterAttributes.None, "object");\r
 306                         \r
 307                         BeginInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);\r
 308 \r
 309                         Parameter [] async_params = new Parameter [params_num + 2];\r
 310                         int n = 0;\r
 311                         if (Parameters.FixedParameters != null){\r
 312                                 Parameters.FixedParameters.CopyTo (async_params, 0);\r
 313                                 n = Parameters.FixedParameters.Length;\r
 314                         }\r
 315                         if (Parameters.ArrayParameter != null)\r
 316                                 async_params [n] = Parameters.ArrayParameter;\r
 317                         \r
 318                         async_params [params_num] = new Parameter (\r
 319                                 TypeManager.system_asynccallback_expr, "callback",\r
 320                                                                    Parameter.Modifier.NONE, null);\r
 321                         async_params [params_num + 1] = new Parameter (\r
 322                                 TypeManager.system_object_expr, "object",\r
 323                                                                    Parameter.Modifier.NONE, null);\r
 324 \r
 325                         Parameters async_parameters = new Parameters (async_params, null, Location);\r
 326                         async_parameters.ComputeAndDefineParameterTypes (this);\r
 327                         \r
 328                         async_parameters.ComputeAndDefineParameterTypes (this);\r
 329                         TypeManager.RegisterMethod (BeginInvokeBuilder,\r
 330                                                     new InternalParameters (container, async_parameters),\r
 331                                                     async_param_types);\r
 332 \r
 333                         //\r
 334                         // EndInvoke is a bit more interesting, all the parameters labeled as\r
 335                         // out or ref have to be duplicated here.\r
 336                         //\r
 337                         \r
 338                         Type [] end_param_types = new Type [out_params + 1];\r
 339                         Parameter [] end_params = new Parameter [out_params + 1];\r
 340                         int param = 0; \r
 341                         if (out_params > 0){\r
 342                                 int top = Parameters.FixedParameters.Length;\r
 343                                 for (i = 0; i < top; i++){\r
 344                                         Parameter p = Parameters.FixedParameters [i];\r
 345                                         if ((p.ModFlags & Parameter.Modifier.ISBYREF) == 0)\r
 346                                                 continue;\r
 347 \r
 348                                         end_param_types [param] = param_types [i];\r
 349                                         end_params [param] = p;\r
 350                                         param++;\r
 351                                 }\r
 352                         }\r
 353                         end_param_types [out_params] = TypeManager.iasyncresult_type;\r
 354                         end_params [out_params] = new Parameter (TypeManager.system_iasyncresult_expr, "result", Parameter.Modifier.NONE, null);\r
 355 \r
 356                         //\r
 357                         // Create method, define parameters, register parameters with type system\r
 358                         //\r
 359                         EndInvokeBuilder = TypeBuilder.DefineMethod ("EndInvoke", mattr, cc, ret_type, end_param_types);\r
 360                         EndInvokeBuilder.SetImplementationFlags (MethodImplAttributes.Runtime);\r
 361 \r
 362                         //\r
 363                         // EndInvoke: Label the parameters\r
 364                         //\r
 365                         EndInvokeBuilder.DefineParameter (out_params + 1, ParameterAttributes.None, "result");\r
 366                         for (i = 0; i < end_params.Length-1; i++){\r
 367                                 EndInvokeBuilder.DefineParameter (i + 1, end_params [i].Attributes, end_params [i].Name);\r
 368                         }\r
 369 \r
 370                         Parameters end_parameters = new Parameters (end_params, null, Location);\r
 371                         end_parameters.ComputeAndDefineParameterTypes (this);\r
 372 \r
 373                         TypeManager.RegisterMethod (\r
 374                                 EndInvokeBuilder,\r
 375                                 new InternalParameters (container, end_parameters),\r
 376                                 end_param_types);\r
 377 \r
 378                         Attribute.ApplyAttributes (ec, TypeBuilder, this, OptAttributes);\r
 379                         return true;\r
 380                 }\r
 381 \r
 382                 /// <summary>\r
 383                 ///  Verifies whether the method in question is compatible with the delegate\r
 384                 ///  Returns the method itself if okay and null if not.\r
 385                 /// </summary>\r
 386                 public static MethodBase VerifyMethod (EmitContext ec, Type delegate_type, MethodBase mb,\r
 387                                                        Location loc)\r
 388                 {\r
 389                         ParameterData pd = Invocation.GetParameterData (mb);\r
 390 \r
 391                         int pd_count = pd.Count;\r
 392 \r
 393                         Expression ml = Expression.MemberLookup (\r
 394                                 ec, delegate_type, "Invoke", loc);\r
 395 \r
 396                         if (!(ml is MethodGroupExpr)) {\r
 397                                 Report.Error (-100, loc, "Internal error: could not find Invoke method!");\r
 398                                 return null;\r
 399                         }\r
 400 \r
 401                         MethodBase invoke_mb = ((MethodGroupExpr) ml).Methods [0];\r
 402 \r
 403                         ParameterData invoke_pd = Invocation.GetParameterData (invoke_mb);\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                         if (mg.Methods.Length > 1)\r
 615                                 method_desc = mg.Methods [0].Name;\r
 616                         else\r
 617                                 method_desc = Invocation.FullMethodDesc (mg.Methods [0]);\r
 618 \r
 619                         Expression invoke_method = Expression.MemberLookup (\r
 620                                 ec, type, "Invoke", MemberTypes.Method,\r
 621                                 Expression.AllBindingFlags, loc);\r
 622                         MethodBase method = ((MethodGroupExpr) invoke_method).Methods [0];\r
 623                         ParameterData param = Invocation.GetParameterData (method);\r
 624                         string delegate_desc = Delegate.FullDelegateDesc (type, method, param);\r
 625 \r
 626                         Report.Error (123, loc, "Method '" + method_desc + "' does not " +\r
 627                                       "match delegate '" + delegate_desc + "'");\r
 628                 }\r
 629 \r
 630                 public override void Emit (EmitContext ec)\r
 631                 {\r
 632                         if (delegate_instance_expr == null ||\r
 633                             delegate_method.IsStatic)\r
 634                                 ec.ig.Emit (OpCodes.Ldnull);\r
 635                         else\r
 636                                 delegate_instance_expr.Emit (ec);\r
 637                         \r
 638                         if (delegate_method.IsVirtual) {\r
 639                                 ec.ig.Emit (OpCodes.Dup);\r
 640                                 ec.ig.Emit (OpCodes.Ldvirtftn, (MethodInfo) delegate_method);\r
 641                         } else\r
 642                                 ec.ig.Emit (OpCodes.Ldftn, (MethodInfo) delegate_method);\r
 643                         ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) constructor_method);\r
 644                 }\r
 645 \r
 646                 protected bool ResolveConstructorMethod (EmitContext ec)\r
 647                 {\r
 648                         Expression ml = Expression.MemberLookup (\r
 649                                 ec, type, ".ctor", loc);\r
 650 \r
 651                         if (!(ml is MethodGroupExpr)) {\r
 652                                 Report.Error (-100, loc, "Internal error: Could not find delegate constructor!");\r
 653                                 return false;\r
 654                         }\r
 655 \r
 656                         constructor_method = ((MethodGroupExpr) ml).Methods [0];\r
 657                         return true;\r
 658                 }\r
 659 \r
 660                 protected Expression ResolveMethodGroupExpr (EmitContext ec, MethodGroupExpr mg)\r
 661                 {\r
 662                                 foreach (MethodInfo mi in mg.Methods){\r
 663                                         delegate_method  = Delegate.VerifyMethod (ec, type, mi, loc);\r
 664 \r
 665                                         if (delegate_method != null)\r
 666                                                 break;\r
 667                                 }\r
 668                                         \r
 669                                 if (delegate_method == null) {\r
 670                                         Error_NoMatchingMethodForDelegate (ec, mg, type, loc);\r
 671                                         return null;\r
 672                                 }\r
 673 \r
 674                                 //\r
 675                                 // Check safe/unsafe of the delegate\r
 676                                 //\r
 677                                 if (!ec.InUnsafe){\r
 678                                         ParameterData param = Invocation.GetParameterData (delegate_method);\r
 679                                         int count = param.Count;\r
 680                                         \r
 681                                         for (int i = 0; i < count; i++){\r
 682                                                 if (param.ParameterType (i).IsPointer){\r
 683                                                         Expression.UnsafeError (loc);\r
 684                                                         return null;\r
 685                                                 }\r
 686                                         }\r
 687                                 }\r
 688                                                 \r
 689                                 if (mg.InstanceExpression != null)\r
 690                                         delegate_instance_expr = mg.InstanceExpression.Resolve (ec);\r
 691                                 else {\r
 692                                         if (ec.IsStatic){\r
 693                                                 if (!delegate_method.IsStatic){\r
 694                                                         Report.Error (120, loc,\r
 695                                                                       "An object reference is required for the non-static method " +\r
 696                                                                       delegate_method.Name);\r
 697                                                         return null;\r
 698                                                 }\r
 699                                                 delegate_instance_expr = null;\r
 700                                         } else\r
 701                                                 delegate_instance_expr = ec.GetThis (loc);\r
 702                                 }\r
 703 \r
 704                                 if (delegate_instance_expr != null)\r
 705                                         if (delegate_instance_expr.Type.IsValueType)\r
 706                                                 delegate_instance_expr = new BoxedCast (delegate_instance_expr);\r
 707                                 \r
 708                                 eclass = ExprClass.Value;\r
 709                                 return this;\r
 710                         }\r
 711         }\r
 712 \r
 713         //\r
 714         // Created from the conversion code\r
 715         //\r
 716         public class ImplicitDelegateCreation : DelegateCreation {\r
 717 \r
 718                 ImplicitDelegateCreation (Type t, Location l)\r
 719                 {\r
 720                         type = t;\r
 721                         loc = l;\r
 722                 }\r
 723 \r
 724                 public override Expression DoResolve (EmitContext ec)\r
 725                 {\r
 726                         return this;\r
 727                 }\r
 728                 \r
 729                 static public Expression Create (EmitContext ec, MethodGroupExpr mge, Type target_type, Location loc)\r
 730                 {\r
 731                         ImplicitDelegateCreation d = new ImplicitDelegateCreation (target_type, loc);\r
 732                         if (d.ResolveConstructorMethod (ec))\r
 733                                 return d.ResolveMethodGroupExpr (ec, mge);\r
 734                         else\r
 735                                 return null;\r
 736                 }\r
 737         }\r
 738         \r
 739         //\r
 740         // A delegate-creation-expression, invoked from the `New' class \r
 741         //\r
 742         public class NewDelegate : DelegateCreation {\r
 743                 public ArrayList Arguments;\r
 744 \r
 745                 //\r
 746                 // This constructor is invoked from the `New' expression\r
 747                 //\r
 748                 public NewDelegate (Type type, ArrayList Arguments, Location loc)\r
 749                 {\r
 750                         this.type = type;\r
 751                         this.Arguments = Arguments;\r
 752                         this.loc  = loc; \r
 753                 }\r
 754 \r
 755                 public override Expression DoResolve (EmitContext ec)\r
 756                 {\r
 757                         if (Arguments == null || Arguments.Count != 1) {\r
 758                                 Report.Error (149, loc,\r
 759                                               "Method name expected");\r
 760                                 return null;\r
 761                         }\r
 762 \r
 763                         if (!ResolveConstructorMethod (ec))\r
 764                                 return null;\r
 765 \r
 766                         Argument a = (Argument) Arguments [0];\r
 767 \r
 768                         Expression invoke_method = Expression.MemberLookup (\r
 769                                 ec, type, "Invoke", MemberTypes.Method,\r
 770                                 Expression.AllBindingFlags, loc);\r
 771 \r
 772                         if (invoke_method == null) {\r
 773                                 Report.Error (-200, loc, "Internal error ! Could not find Invoke method!");\r
 774                                 return null;\r
 775                         }\r
 776 \r
 777                         if (!a.ResolveMethodGroup (ec, loc))\r
 778                                 return null;\r
 779                         \r
 780                         Expression e = a.Expr;\r
 781 \r
 782                         MethodGroupExpr mg = e as MethodGroupExpr;\r
 783                         if (mg != null)\r
 784                                 return ResolveMethodGroupExpr (ec, mg);\r
 785 \r
 786                         Type e_type = e.Type;\r
 787 \r
 788                         if (!TypeManager.IsDelegateType (e_type)) {\r
 789                                 e.Error_UnexpectedKind ("method");\r
 790                                 return null;\r
 791                         }\r
 792 \r
 793                         // This is what MS' compiler reports. We could always choose\r
 794                         // to be more verbose and actually give delegate-level specifics\r
 795                         \r
 796                         if (!Delegate.VerifyDelegate (ec, type, e_type, loc)) {\r
 797                                 Report.Error (29, loc, "Cannot implicitly convert type '" + e_type + "' " +\r
 798                                               "to type '" + type + "'");\r
 799                                 return null;\r
 800                         }\r
 801                                 \r
 802                         delegate_instance_expr = e;\r
 803                         delegate_method = ((MethodGroupExpr) invoke_method).Methods [0];\r
 804                         \r
 805                         eclass = ExprClass.Value;\r
 806                         return this;\r
 807                 }\r
 808                 \r
 809                 public override void Emit (EmitContext ec)\r
 810                 {\r
 811                         if (delegate_instance_expr == null || delegate_method.IsStatic)\r
 812                                 ec.ig.Emit (OpCodes.Ldnull);\r
 813                         else\r
 814                                 delegate_instance_expr.Emit (ec);\r
 815                         \r
 816                         if (delegate_method.IsVirtual) {\r
 817                                 ec.ig.Emit (OpCodes.Dup);\r
 818                                 ec.ig.Emit (OpCodes.Ldvirtftn, (MethodInfo) delegate_method);\r
 819                         } else\r
 820                                 ec.ig.Emit (OpCodes.Ldftn, (MethodInfo) delegate_method);\r
 821                         ec.ig.Emit (OpCodes.Newobj, (ConstructorInfo) constructor_method);\r
 822                 }\r
 823         }\r
 824 \r
 825         public class DelegateInvocation : ExpressionStatement {\r
 826 \r
 827                 public Expression InstanceExpr;\r
 828                 public ArrayList  Arguments;\r
 829 \r
 830                 MethodBase method;\r
 831                 \r
 832                 public DelegateInvocation (Expression instance_expr, ArrayList args, Location loc)\r
 833                 {\r
 834                         this.InstanceExpr = instance_expr;\r
 835                         this.Arguments = args;\r
 836                         this.loc = loc;\r
 837                 }\r
 838 \r
 839                 public override Expression DoResolve (EmitContext ec)\r
 840                 {\r
 841                         if (InstanceExpr is EventExpr) {\r
 842                                 \r
 843                                 EventInfo ei = ((EventExpr) InstanceExpr).EventInfo;\r
 844                                 \r
 845                                 Expression ml = MemberLookup (\r
 846                                         ec, ec.ContainerType, ei.Name,\r
 847                                         MemberTypes.Event, AllBindingFlags | BindingFlags.DeclaredOnly, loc);\r
 848 \r
 849                                 if (ml == null) {\r
 850                                         //\r
 851                                         // If this is the case, then the Event does not belong \r
 852                                         // to this Type and so, according to the spec\r
 853                                         // cannot be accessed directly\r
 854                                         //\r
 855                                         // Note that target will not appear as an EventExpr\r
 856                                         // in the case it is being referenced within the same type container;\r
 857                                         // it will appear as a FieldExpr in that case.\r
 858                                         //\r
 859                                         \r
 860                                         Assign.error70 (ei, loc);\r
 861                                         return null;\r
 862                                 }\r
 863                         }\r
 864                         \r
 865                         \r
 866                         Type del_type = InstanceExpr.Type;\r
 867                         if (del_type == null)\r
 868                                 return null;\r
 869                         \r
 870                         if (Arguments != null){\r
 871                                 foreach (Argument a in Arguments){\r
 872                                         if (!a.Resolve (ec, loc))\r
 873                                                 return null;\r
 874                                 }\r
 875                         }\r
 876                         \r
 877                         if (!Delegate.VerifyApplicability (ec, del_type, Arguments, loc))\r
 878                                 return null;\r
 879 \r
 880                         Expression lookup = Expression.MemberLookup (ec, del_type, "Invoke", loc);\r
 881                         if (!(lookup is MethodGroupExpr)) {\r
 882                                 Report.Error (-100, loc, "Internal error: could not find Invoke method!");\r
 883                                 return null;\r
 884                         }\r
 885                         \r
 886                         method = ((MethodGroupExpr) lookup).Methods [0];\r
 887                         type = ((MethodInfo) method).ReturnType;\r
 888                         eclass = ExprClass.Value;\r
 889                         \r
 890                         return this;\r
 891                 }\r
 892 \r
 893                 public override void Emit (EmitContext ec)\r
 894                 {\r
 895                         //\r
 896                         // Invocation on delegates call the virtual Invoke member\r
 897                         // so we are always `instance' calls\r
 898                         //\r
 899                         Invocation.EmitCall (ec, false, false, InstanceExpr, method, Arguments, loc);\r
 900                 }\r
 901 \r
 902                 public override void EmitStatement (EmitContext ec)\r
 903                 {\r
 904                         Emit (ec);\r
 905                         // \r
 906                         // Pop the return value if there is one\r
 907                         //\r
 908                         if (method is MethodInfo){\r
 909                                 if (((MethodInfo) method).ReturnType != TypeManager.void_type)\r
 910                                         ec.ig.Emit (OpCodes.Pop);\r
 911                         }\r
 912                 }\r
 913 \r
 914         }\r
 915 }\r